CALIFORNIA WATER SERVICE GROUP
424B3, 1999-04-12
WATER SUPPLY
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<PAGE>   1

             AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON

                                    April 2, 1999

                              REGISTRATION NO. 333-71367


                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                AMENDMENT NO. 1
                                       TO
                                    FORM S-4
                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933

                         CALIFORNIA WATER SERVICE GROUP
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)

                  CALIFORNIA                             4941
        (STATE OR OTHER JURISDICTION OF      (PRIMARY STANDARD INDUSTRIAL
        INCORPORATION OR ORGANIZATION)        CLASSIFICATION CODE NUMBER)


                                   77-0448994
                                (I.R.S. EMPLOYER
                               IDENTIFICATION NO.)


                             1720 NORTH FIRST STREET
                             SAN JOSE, CA 95112-4598
                                 (408) 367-8200
               (ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER,
        INCLUDING AREA CODE, OF REGISTRANT'S PRINCIPAL EXECUTIVE OFFICES)

                                 PETER C. NELSON
                             1720 NORTH FIRST STREET
                             SAN JOSE, CA 95112-4598
                                 (408) 367-8200
            (NAME, ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER,
                   INCLUDING AREA CODE, OF AGENT FOR SERVICE)

                                 WITH COPIES TO:

          STANLEY S. TAYLOR, III                     DAVID A. EBERSHOFF
  NOSSAMAN, GUTHNER, KNOX & ELLIOTT, LLP          FULBRIGHT & JAWORSKI, L.L.P.
           50 CALIFORNIA STREET                   865 SOUTH FIGUEROA STREET
                34TH FLOOR                               29TH FLOOR
         SAN FRANCISCO, CA 94111                    LOS ANGELES, CA 90017
              (415) 398-3600                           (213) 892-9200


                                      -1-


<PAGE>   2

     At the request of the Securities and Exchange Commission, the preceding 
cover page is filed along with the following prospectus (filed pursuant to Rule 
424(b)(3) of the Securities Act of 1933). The cover page is included for the 
purpose of correcting the filing date of the Amendment No. 1 to Form S-4 
referenced therein.




<PAGE>   3
                                               Filed pursuant to rule 424(b)(3) 
                                               Registration Number 333-71367
 
                             [DOMINGUEZ LETTERHEAD]
 
                                                                   April 7, 1999
 
Dear Shareholder:
 
     You are cordially invited to attend the Special Meeting of Shareholders
(the "Special Meeting") of Dominguez Services Corporation ("Dominguez"). The
date, time and place of the meeting are: May 12, 1999 at 10:00, a.m., local
time, at Dominguez' corporate headquarters located at 21718 South Alameda
Street, Long Beach, California 90810.
 
     The purpose of the Special Meeting is to consider a proposal to approve an
Agreement and Plan of Reorganization, dated November 13, 1998 as amended by
Amendment No. 1 dated March 22, 1999 (the "Amended Merger Agreement"), among
Dominguez, California Water Service Group ("Group") and a wholly owned
subsidiary of Group, California Water Service Company ("Cal Water"). The Amended
Merger Agreement provides for the merger of Dominguez into Cal Water (the
"Merger").
 
     In accordance with the Amended Merger Agreement, upon consummation of the
Merger, Dominguez shareholders will receive a minimum of 1.25 and a maximum of
1.49 shares of Group common stock for each share of Dominguez common stock they
own when the Merger becomes effective. The exact number of shares of Group
common stock you will receive in the Merger will depend upon the average market
price of Group common stock during a twenty trading day period preceding the
Merger. The exact exchange ratio is designed to fluctuate between a minimum of
1.25 and a maximum of 1.49 shares of Group common stock such that, within that
range, you will receive approximately $33.75 in market value of Group common
stock for each share of Dominguez common stock. Shareholders will receive cash
in lieu of any fractional shares. Group common stock trades on the New York
Stock Exchange and Dominguez common stock trades on the Nasdaq National Market
tier of The Nasdaq National Stock Market. You can obtain current stock prices
for each company from newspapers, on the Internet or by calling your broker.
 
     You should read carefully the accompanying Notice of Special Meeting of
Shareholders and the Proxy Statement-Prospectus for details of the Merger and
additional related information.
 
     THE DOMINGUEZ BOARD OF DIRECTORS HAS DETERMINED THE MERGER TO BE FAIR TO
AND IN THE BEST INTERESTS OF DOMINGUEZ AND ITS SHAREHOLDERS, HAS UNANIMOUSLY
APPROVED THE AMENDED MERGER AGREEMENT AND RECOMMENDS YOU VOTE FOR APPROVAL OF
THE AMENDED MERGER AGREEMENT.
 
     Your participation in the Special Meeting in person or by proxy is
important. Please mark, sign, date and mail your proxy card as soon as possible,
whether or not you plan to attend the Special Meeting.
 
     The Dominguez Board of Directors is very enthusiastic about this Merger and
the benefits to Dominguez shareholders. I join all the other members of the
Dominguez Board in our whole hearted recommendation that you vote in favor of
the Merger.
 
     Thank you and I look forward to seeing you at the Special Meeting.
 
                                          Sincerely,
 
                                          --------------------------------------
                                          Brian J. Brady, Chairman of the Board
                                          President and Chief Executive Officer
                                              Dominguez Services Corporation
<PAGE>   4
 
                         DOMINGUEZ SERVICES CORPORATION
                           21718 SOUTH ALAMEDA STREET
                          LONG BEACH, CALIFORNIA 90810
 
                            ------------------------
 
                   NOTICE OF SPECIAL MEETING OF SHAREHOLDERS
                           TO BE HELD ON MAY 12, 1999
 
     Dominguez Services Corporation ("Dominguez") will hold a Special Meeting of
Shareholders at Dominguez' corporate headquarters located at 21718 South Alameda
Street, Long Beach, California 90810, at 10:00 a.m., local time on May 12, 1999
to consider and vote on:
 
          1. The Agreement and Plan of Reorganization, dated as of November 13,
     1998, as amended by Amendment No. 1 dated March 22, 1999 (the "Amended
     Merger Agreement"), among Dominguez, California Water Service Group, a
     California corporation ("Group"), and California Water Service Company, a
     California corporation and a wholly owned subsidiary of Group ("Cal
     Water"), which provides for the merger of Dominguez into Cal Water upon the
     terms and subject to the conditions thereof (the "Merger"). Pursuant to the
     Amended Merger Agreement, Cal Water will be the surviving corporation and
     each outstanding share of Dominguez common stock at the effective time of
     the Merger (other than shares of common stock as to which dissenters'
     rights have been perfected) will be converted into a minimum of 1.25 and a
     maximum of 1.49 shares of Group common stock such that, within that range,
     Dominguez shareholders will receive approximately $33.75 in market value of
     Group common stock for each share of Dominguez common stock; and
 
          2. Such other matters that properly come before the Special Meeting
     and at any adjournment or postponement thereof.
 
     Record holders of Dominguez common stock at the close of business on March
16, 1999, will receive notice of and may vote at the Special Meeting, including
any adjournments or postponements. The affirmative vote of the holders of shares
representing a majority of the outstanding voting power of the Dominguez common
stock is necessary to approve the Amended Merger Agreement.
 
     Because of the significance of the proposed merger to Dominguez, your
participation in this meeting, in person or by proxy, is especially important.
 
     PLEASE SIGN AND RETURN THE ENCLOSED PROXY CARD AS SOON AS POSSIBLE IN THE
ENVELOPE PROVIDED SO THAT YOUR SHARES CAN BE VOTED AT THE SPECIAL MEETING IN
ACCORDANCE WITH YOUR INSTRUCTIONS. EVEN IF YOU PLAN TO ATTEND THE SPECIAL
MEETING, WE URGE YOU TO SIGN AND PROMPTLY RETURN THE ENCLOSED PROXY CARD. YOU
CAN REVOKE THE PROXY AT ANY TIME PRIOR TO VOTING, OR VOTE YOUR SHARES PERSONALLY
IF YOU ATTEND THE SPECIAL MEETING.
 
              YOUR BOARD OF DIRECTORS UNANIMOUSLY RECOMMENDS THAT
             YOU VOTE FOR APPROVAL OF THE AMENDED MERGER AGREEMENT.
 
                                          --------------------------------------
                                          BRIAN J. BRADY, CHAIRMAN OF THE BOARD
                                          PRESIDENT AND CHIEF EXECUTIVE OFFICER
                                              DOMINGUEZ SERVICES CORPORATION
 
APRIL 5, 1999
<PAGE>   5
 
                                PROXY STATEMENT
 
                            ------------------------
 
                         DOMINGUEZ SERVICES CORPORATION
 
                        SPECIAL MEETING OF SHAREHOLDERS
 
                            ------------------------
 
                         CALIFORNIA WATER SERVICE GROUP
 
                                   PROSPECTUS
 
                            ------------------------
 
                        2,400,000 SHARES OF COMMON STOCK
 
     This Proxy Statement-Prospectus relates to the proposed merger and certain
related transactions contemplated by the Agreement and Plan of Reorganization,
dated as of November 13, 1998 as amended by Amendment No. 1 dated March 22,
1999, by and among Dominguez Services Corporation ("Dominguez"), California
Water Service Group ("Group") and California Water Service Company ("Cal
Water").
 
     This Proxy Statement-Prospectus is being furnished to you as a shareholder
of Dominguez in connection with the solicitation of proxies by the Board of
Directors of Dominguez for use at the special meeting of Dominguez shareholders
to be held on May 12, 1999 at the time and place specified on the accompanying
notice and any adjournments or postponement of that meeting. At this meeting,
holders of Dominguez common stock will consider and vote upon a proposal to
approve the merger of Dominguez with and into Cal Water with Cal Water as the
surviving corporation.
 
     Pursuant to the terms of the amended Agreement, each issued and outstanding
share of Dominguez common stock owned by a Dominguez shareholder at the
effective time of the merger will be converted into a minimum of 1.25 and a
maximum of 1.49 shares of Group common stock. The exact number of shares of
Group common stock a Dominguez shareholder will receive in the merger will
depend upon the average market price of Group common stock during a twenty
trading day period prior to and including the fifth trading day prior to the
effective time of the merger. The exchange ratio is designed to fluctuate
between a minimum of 1.25 and a maximum of 1.49 shares of Group common stock
such that, within that range, a Dominguez Shareholder will receive approximately
$33.75 in market value of Group common stock for each share of Dominguez common
stock. Group common stock trades on the New York Stock Exchange under the
trading symbol "CWT". This Proxy Statement-Prospectus also constitutes a
prospectus of Group filed as part of a Registration Statement with respect to up
to 2,400,000 shares of Group common stock to be issued pursuant to or as
contemplated by the merger. FOR A DISCUSSION OF CERTAIN MATTERS THAT
SHAREHOLDERS SHOULD CONSIDER, SEE "RISK FACTORS" ON PAGE 9.
 
     This Proxy Statement-Prospectus and accompanying form of Proxy is first
being mailed to shareholders on or about April 7, 1999.
 
NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES
   COMMISSION HAS APPROVED OR DISAPPROVED OF THESE SECURITIES OR PASSED
     UPON THE ADEQUACY OR ACCURACY OF THIS PROSPECTUS. ANY REPRESENTATION
       TO THE CONTRARY IS A CRIMINAL OFFENSE.
 
         THE DATE OF THIS PROXY STATEMENT-PROSPECTUS IS APRIL 5, 1999.
<PAGE>   6
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                              PAGE
                                                              ----
<S>                                                           <C>
WHERE YOU CAN FIND MORE INFORMATION.........................    1
FORWARD-LOOKING STATEMENTS..................................    2
SUMMARY.....................................................    3
  The Companies.............................................    3
  The Merger................................................    3
  Comparative Per Share Market Price Information............    4
  The Shareholders Meeting..................................    5
  Recommendation to Shareholders............................    5
  Record Dates; Voting Power................................    5
  Vote Required to Approve the Merger.......................    5
  Exchange of Certificates..................................    5
  What Needs to be Done to Complete the Merger..............    6
  Termination of the Amended Agreement and Plan of
     Reorganization.........................................    6
  Certain Payments Upon Termination of Agreement and Plan of
     Reorganization.........................................    6
  Federal Income Tax Consequences...........................    7
  Accounting Treatment......................................    7
  Opinions of Financial Adviser.............................    7
  Board of Directors, Management and Operations of Group
     Following the Merger...................................    7
  Interest of Persons Involved in the Merger that are
     Different from Yours...................................    8
  Some Differences in Rights of Shareholders................    8
  Dissenters' Right.........................................    8
  Regulatory Approvals......................................    8
  Forward-Looking Statements; Risk Factors..................    8
RISK FACTORS................................................    9
  Risks Related to Merger...................................    9
COMPARATIVE PER SHARE MARKET PRICE AND DIVIDEND
  INFORMATION...............................................   11
SUMMARY HISTORICAL AND UNAUDITED PRO FORMA FINANCIAL DATA OF
  GROUP AND DOMINGUEZ.......................................   12
DOMINGUEZ SPECIAL MEETING...................................   16
  General...................................................   16
  Matters to be Considered..................................   16
  Proxies...................................................   16
  Solicitation of Proxies...................................   17
  Record Date and Voting Rights.............................   17
  Recommendation of the Dominguez Board.....................   18
THE MERGER..................................................   19
  Description of the Merger.................................   19
  Background of the Merger..................................   20
  Reasons of Dominguez for the Merger; Recommendation of
     Dominguez Board of Directors...........................   23
  Reasons of Group for the Merger...........................   24
  Opinions of Financial Advisor.............................   25
  Interests of Certain Persons in the Merger................   30
  The Effective Time........................................   31
  Exchange of Certificates..................................   31
  Representations and Warranties............................   32
  Conduct of Business Prior to the Merger and Other
     Covenants..............................................   32
</TABLE>
 
                                        i
<PAGE>   7
 
<TABLE>
<CAPTION>
                                                              PAGE
                                                              ----
<S>                                                           <C>
  Conduct of Group Prior to the Merger and Other
     Covenants..............................................   36
  No Solicitation of Transactions...........................   37
  Payment in Event of Termination Resulting from Superior
     Proposal and Alternative Transaction...................   38
  Employee and Employee Benefit Matters.....................   38
  Conditions to the Merger..................................   39
  Termination of the Amended Merger Agreement...............   40
  Amendment; Expenses.......................................   41
  Material Federal Income Tax Consequences..................   41
  Accounting Treatment......................................   42
  Regulatory Matters........................................   42
  Rights of Dissenting Shareholders.........................   44
UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL
  INFORMATION...............................................   47
INFORMATION ABOUT DOMINGUEZ.................................   53
  General...................................................   53
  Operations................................................   53
  Water Supply..............................................   53
  Water Quality.............................................   54
  Regulatory Affairs........................................   54
  Non-Utility Subsidiary Operations.........................   55
  Directors And Executive Officers of Dominguez.............   55
  Security Ownership of Certain Beneficial Owners of
     Dominguez..............................................   57
  Additional Information....................................   58
INFORMATION ABOUT GROUP AND CAL WATER.......................   59
  Group Board Of Directors, Management And Operations After
     The Merger.............................................   59
  Directors of Group........................................   59
  Board Committees of Group.................................   61
  Executive Officers of Group...............................   61
  Group Compensation of Non-Employee Directors..............   62
GROUP REINCORPORATION AS A DELAWARE CORPORATION.............   64
  Description of the Group Reincorporation Proposal.........   64
  Reasons for the Proposed Reincorporation..................   64
  Antitakeover Implications.................................   65
DESCRIPTION OF GROUP SECURITIES.............................   67
  General...................................................   67
  Common Shares.............................................   68
  Preferred Shares..........................................   68
  Preferred Share Purchase Right/Rights Agreement...........   71
COMPARISON OF SHAREHOLDER RIGHTS............................   74
  General...................................................   74
  Size of Board of Directors................................   74
  Classification of Board of Directors......................   74
  Removal of Directors......................................   75
  Filling Vacancies on the Board of Directors...............   75
  Limitations of Liability of Directors; Indemnification....   75
  Annual Meetings...........................................   77
  Special Shareholder Meetings..............................   77
  Actions by Written Consent of Shareholders................   77
  Advance Notice Requirement for Shareholder Proposal and
     Director Nominations...................................   78
</TABLE>
 
                                       ii
<PAGE>   8
 
<TABLE>
<CAPTION>
                                                              PAGE
                                                              ----
<S>                                                           <C>
  Voting Requirements; Super Majority Approval..............   78
  Amending the Bylaws.......................................   79
  Cumulative Voting.........................................   79
  "Blank Check" Preferred Stock.............................   79
  Business Combinations/Reorganizations.....................   79
  Rights of Dissenting Shareholders.........................   80
  Inspection of Stockholders List...........................   81
  Dividends.................................................   81
  Shareholder Derivative Suits..............................   81
  Preemptive Rights.........................................   81
  Dissolution...............................................   81
  Board of Directors Meetings...............................   82
  Director Voting...........................................   82
  Shareholder Rights Plan...................................   82
  Application of the General Corporation Law of California
     to Delaware Corporations...............................   82
LEGAL OPINIONS..............................................   83
EXPERTS.....................................................   83
</TABLE>
 
                                       iii
<PAGE>   9
 
                      WHERE YOU CAN FIND MORE INFORMATION
 
     Group and Dominguez file annual, quarterly and special reports, proxy
statements and other information with the Securities and Exchange Commission.
You may read and copy any reports, statements or other information that the
companies file with the Commission at the Commission's Public Reference Rooms at
450 Fifth Street, N.W., Washington, D.C. 20549 and may be available at the
following Regional Offices of the SEC: Chicago Regional Office, Northwest
Atrium, 500 West Madison Street, Suite 1400, Chicago, Illinois 60661 - 2511, and
the New York Regional Office, Seven World Trade Center, 13th Floor, New York,
New York 10048. Please call the Commission at 1-800-SEC-0330 for further
information on the public reference rooms. These Commission filings are also
available to the public from commercial document retrieval services and at the
Internet world wide web site maintained by the Commission at
"http://www.sec.gov." Reports, proxy statements and other information with
respect to Group should also be available for inspection at the offices of the
New York Stock Exchange, 20 Broad Street, New York, New York 10005.
 
     Group filed a Registration Statement on Form S-4 to register with the
Commission the Group Common Stock to be issued in the merger. This Proxy
Statement-Prospectus is a part of the Registration Statement and constitutes a
prospectus of Group. As allowed by Commission rules, this Proxy
Statement-Prospectus does not contain all the information required in the
Registration Statement or the exhibits to the Registration Statement. The
Registration Statement and any amendments thereto, including Exhibits, are
available for inspection and copying as set forth above.
 
     The Commission allows Group and Dominguez to incorporate by reference
information into this Proxy Statement-Prospectus, which means that the companies
can disclose important information to you by referring you to another document
filed separately with the Commission. The information incorporated by reference
is considered part of this Proxy Statement-Prospectus, except for any
information superseded by information contained directly in this Proxy
Statement-Prospectus or in later filed documents incorporated by reference in
this Proxy Statement-Prospectus.
 
     This Proxy Statement-Prospectus incorporates by reference the documents set
forth below that Group and Dominguez have previously filed with the Commission.
These documents contain important information about Group and Dominguez and
their finances. Some of these filings have been amended by later filings, which
are also listed.
 
<TABLE>
<CAPTION>
        GROUP COMMISSION FILINGS (FILE NO. 1-13883)           PERIOD/AS OF DATE
        -------------------------------------------           -----------------
<S>                                                           <C>
Current Report on Form 8-K..................................       3/23/99
Annual Report on Form 10-K..................................      12/31/98
Current Report on Form 8-K..................................      11/19/98
Quarterly Report on Form 10-Q...............................      09/30/98
Quarterly Report on Form 10-Q...............................      06/30/98
Quarterly Report on Form 10-Q...............................      03/31/98
Current Report on Form 8-K..................................      02/13/98
DOMINGUEZ COMMISSION FILINGS (FILE NO. 0-18677)
- ------------------------------------------------------------
Annual Report on Form 10-K..................................      12/31/98
Current Report on Form 8-K..................................      11/18/98
Quarterly Report on Form 10-Q...............................      09/30/98
Quarterly Report on Form 10-Q...............................      06/30/98
Quarterly Report on Form 10-Q...............................      03/31/98
</TABLE>
 
     Group and Dominguez also incorporate by reference additional documents that
may be filed with the Commission between the date of this Proxy
Statement-Prospectus and the consummation of the merger or the termination of
the amended Merger Agreement. These include periodic reports, such as Annual
Reports on Form 10-K, Quarterly Reports on Form 10-Q and Current Reports on Form
8-K, as well as proxy statements.
 
                                        1
<PAGE>   10
 
     Dominguez has supplied all information contained or incorporated by
reference in this Proxy Statement-Prospectus relating to Dominguez, and Group
has supplied all such information relating to Group.
 
     If you are a shareholder, we may have sent you some of the documents
incorporated by reference, but you can obtain any of them through the companies,
the Commission or the Commission's Internet world wide web site as described
above. Documents incorporated by reference are available from the companies
without charge. Shareholders may obtain documents incorporated by reference in
this Proxy Statement-Prospectus by requesting them in writing or by telephone
from the appropriate company at the following addresses:
 
<TABLE>
      <S>                                          <C>
      California Water Service Group               Dominguez Services Corporation
      1720 North First Street                      21718 South Alameda Street
      San Jose, California 95112-4598              Long Beach, California 90810
      Attn: Chief Financial Officer                Attn: Chief Financial Officer
      Telephone: (408) 367-8200                    Telephone: (310) 834-2625
</TABLE>
 
     TO ENSURE TIMELY DELIVERY, YOU MUST REQUEST THE INFORMATION NO LATER THAN
APRIL 30, 1999.
 
     You should rely only on the information contained or incorporated by
reference in this Proxy Statement-Prospectus. We have not authorized anyone to
provide you with information that is different from what is contained in this
Proxy Statement-Prospectus. This Proxy Statement-Prospectus is dated April 7,
1999. You should not assume that the information contained in this Proxy
Statement-Prospectus is accurate as of any date other than that date. Neither
the mailing of this Proxy Statement-Prospectus to shareholders nor the issuance
of Group Common Stock in the merger creates any implication to the contrary.
 
                           FORWARD-LOOKING STATEMENTS
 
     This Proxy Statement-Prospectus contains forward-looking statements within
the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the
Securities Exchange Act of 1934. Words such as "expects," "anticipates,"
"intends," "plans," "believes," "seeks," "estimates" and similar expressions or
variations of such words are intended to identify these forward-looking
statements. Additionally, statements concerning future matters such as the
anticipated benefits of the merger, development of new services, possible
changes in legislation and other statements regarding matters that are not
historical fact are forward-looking statements. The forward-looking statements
reflect the judgment of the management of Group and Dominguez, as appropriate,
based on factors currently known and involve risks and uncertainties. Actual
results and outcomes may differ materially from the results and outcomes
discussed in the forward-looking statements. The matters set forth under "Risk
Factors" in this Proxy Statement-Prospectus, as well as those discussed
elsewhere in this Proxy Statement-Prospectus, constitute cautionary statements
identifying important factors with respect to such forward looking statements,
including certain risks and uncertainties, that could cause actual results or
outcomes to differ materially from those in such forward-looking statements.
Neither Group nor Dominguez undertakes any obligation to revise or update these
forward-looking statements to reflect any events or circumstances after the date
hereof or to reflect the occurrence of unanticipated events.
 
                                        2
<PAGE>   11
 
                                    SUMMARY
 
     THIS SUMMARY HIGHLIGHTS SELECTED INFORMATION FROM THE PROXY
STATEMENT-PROSPECTUS. IT DOES NOT CONTAIN ALL OF THE INFORMATION THAT IS
IMPORTANT TO YOU. YOU SHOULD CAREFULLY READ THIS ENTIRE DOCUMENT AND THE OTHER
DOCUMENTS TO WHICH WE REFER. FOR MORE INFORMATION ABOUT DOMINGUEZ AND GROUP, SEE
"WHERE YOU CAN FIND MORE INFORMATION."
 
THE COMPANIES (PAGES 53 - 73)
 
     DOMINGUEZ SERVICES CORPORATION
     21718 South Alameda Street
     Long Beach, California 90810
     (310) 834-2625
 
     Dominguez is a holding company, whose wholly-owned operating subsidiaries
provide water service to approximately 40,000 residential, commercial and
industrial customers. Dominguez' largest system serves approximately 32,507
customers in the South Bay area of Los Angeles County and approximately 1,620
customers in Sonoma and Lake Counties in northern California. Through its
smaller water systems, Dominguez also provides service to approximately 1,259
customers in northern Los Angeles County and 4,099 customers in Kern County,
California. The rates and operations of these operating subsidiaries are subject
to the jurisdiction of the California Public Utilities Commission. Through
another wholly-owned subsidiary, Dominguez also operates water brokering
activities, contract services and holds a minority interest in a company which
manufactures and distributes chlorine generators used in the water and
wastewater industries. These operations are not subject to the jurisdiction of
the California Public Utilities Commission.
 
     CALIFORNIA WATER SERVICE GROUP
     1720 North First Street
     San Jose, California 95112-4598
     (408) 367-8200
 
     Group is a holding company whose principal operating subsidiary, California
Water Service Company, is the largest investor-owned water company in California
and the fourth largest in the United States. It provides water service to
approximately 383,000 residential, commercial and industrial customers in 58
California cities and communities through 21 separate water systems or
districts. Substantially all of the rates and operations of Cal Water are
subject to the jurisdiction of the California Public Utilities Commission. Cal
Water also contracts with various municipalities and private entities to operate
water systems and provide billing services to approximately 30,700 other
customers.
 
THE MERGER (PAGES 19 - 46)
 
GENERAL
 
     Dominguez proposes a transaction in which Dominguez will merge into
California Water Service Company. We hope to complete the merger during the last
quarter of 1999. The Agreement and Plan of Reorganization, as amended, is the
document that governs the merger. We have attached this amended Agreement as
Appendix "A" of this Proxy Statement-Prospectus and we encourage you to read it.
 
EXCHANGE RATIO
 
     The amended Agreement and Plan of Reorganization provides that each share
of Dominguez Common Stock at the effective time of the merger will be converted
into a minimum of 1.25 and a maximum of 1.49 shares of Group common stock. The
exact number of shares of Group common stock which Dominguez shareholders will
receive in the Merger will depend upon the average market price of Group common
stock during a twenty trading day period preceding the Merger. The exchange
ratio is designed to fluctuate between a minimum of 1.25 and a maximum of 1.49
shares of Group common stock such that, within such range, a Dominguez
shareholder will receive approximately $33.75 in market value of Group common
stock for each share of Dominguez common stock. If, prior to the effective time
of the merger, Group should split or combine the Group common stock, or pay a
stock dividend or other stock distribution in Group common
 
                                        3
<PAGE>   12
 
stock, or otherwise change the Group common stock into other securities, then
the exchange ratio will be appropriately adjusted to reflect such split,
combination, dividend or other distribution or change.
 
     THE EXCHANGE RATIO IS SUBJECT TO FLUCTUATION WITHIN A MINIMUM/MAXIMUM RANGE
IN THE AMENDED AGREEMENT AND PLAN OF REORGANIZATION AND NEITHER GROUP NOR
DOMINGUEZ HAS THE RIGHT TO TERMINATE THE AGREEMENT BASED ON CHANGES IN THE
MARKET PRICE OF EITHER COMPANY'S STOCK. ACCORDINGLY, THE MONETARY VALUE OF THE
CONSIDERATION THAT DOMINGUEZ SHAREHOLDERS WILL RECEIVE IN THE MERGER IS FIXED
WITHIN THE MINIMUM/ MAXIMUM RANGE; OUTSIDE THAT RANGE, IT IS NOT FIXED AND WILL
BE BASED ON THE MARKET PRICE OF GROUP COMMON STOCK AT THE EFFECTIVE TIME OF THE
MERGER.
 
REASONS FOR THE MERGER (PAGES 23 - 25)
 
     The Dominguez Board of Directors approved the merger and recommends you
approve it as well because, among other things, it believes that the terms of
the merger are fair to and will benefit Dominguez shareholders who will receive:
 
     - a significant premium for their shares of Dominguez common stock
       (Pursuant to the amended merger agreement, Dominguez shareholders will
       receive, within the minimum/maximum exchange ratio range, approximately
       $33.75 market value of Group common stock for each share of Dominguez
       common stock. This would result in a premium of 44% and an exchange ratio
       of approximately 1.25 shares of Group common stock for each share of
       Dominguez common stock based on the closing price of Group's common stock
       on November 12, 1998, the last trading day prior to the approval of the
       merger by the Dominguez Board; and a premium of 11% and an exchange ratio
       of approximately 1.38 shares of Group common stock for each share of
       Dominguez common stock based upon the closing price of Group's common
       stock on March 25, 1999).
 
     - an increased annual dividend determined by the actual exchange ratio
       (based upon 1998 dividends paid by Dominguez and Group, and assuming the
       minimum exchange ratio of 1.25 and the maximum exchange ratio of 1.49,
       the increase in annual dividends would be between 45% and 73%),
 
     - an increase in book value per share determined by the actual exchange
       ratio (based upon comparative book value per share of Group's common
       stock and Dominguez' common stock at December 31, 1998 and assuming the
       minimum exchange ratio of 1.25 and the maximum exchange ratio of 1.49,
       the increase in book value would be between 59% and 89%), and
 
     - shares of common stock of a company (Group) that has significantly
       greater financial resources and earning growth prospects than Dominguez.
 
     In addition, Dominguez expects that the merger will be treated as a
tax-free transaction under the applicable provisions of the Internal Revenue
Code. Also, the Dominguez Board of Directors considered potential benefits to
Dominguez customers and employees in approving the merger and recommending that
you approve it as well.
 
COMPARATIVE PER SHARE MARKET PRICE INFORMATION (PAGE 11)
 
     Shares of Group common stock trade under the symbol "CWT" on the New York
Stock Exchange. Shares of Dominguez common stock trade under the symbol "DOMZ"
on the Nasdaq National Market tier of The Nasdaq National Stock Market. On
November 12, 1998, the last trading day before the Agreement and Plan of
Reorganization was signed, Group common stock closed at $26 15/16 per share and
Dominguez common stock closed at $23 1/2 per share. On March 25, 1999, Group
common stock closed at $24.50 per share and Dominguez common stock closed at
$30.50 per share.
 
     The exchange ratio is designed to fluctuate between a minimum of 1.25 and a
maximum of 1.49 shares of Group common stock such that, within that range,
Dominguez shareholders will receive approximately $33.75 in market value of
Group common stock for each share of Dominguez common stock. Based on the
closing price of Group common stock on November 12, 1998, the exchange ratio
would be 1.25. Based on the closing price of Group common stock on March 25,
1999, the exchange ratio would be 1.38. However, the actual value of shares of
Group common stock received by Dominguez shareholders could be higher than
$33.75 for each share of Dominguez common stock if the average closing price of
Group common stock for the twenty
 
                                        4
<PAGE>   13
 
trading days ending on the fifth trading day before the closing is higher than
$27.00, and could be lower than $33.75, if the average closing price for such
period is lower than $22.65. You should obtain current stock price quotations
for Group common stock and Dominguez common stock. You can obtain these quotes
from newspapers, the Internet or by calling your broker. Following the merger,
Group common stock will continue to be traded on the New York Stock Exchange.
 
THE SHAREHOLDERS MEETING (PAGES 16 - 18)
 
     The Dominguez Special Meeting will be held at Dominguez' corporate
headquarters located at 21718 South Alameda Street, Long Beach, California 90810
at 10:00 a.m. local time on May 12, 1999. At this meeting, we will ask Dominguez
shareholders to approve the amended Agreement and Plan of Reorganization and to
act on any other matters that may be put to a vote at the Dominguez Special
Meeting.
 
RECOMMENDATION TO SHAREHOLDERS (PAGES 18)
 
     The Dominguez Board believes that the merger is fair to you and in your
best interest, and unanimously recommends that you vote "FOR" the proposal to
approve the amended Agreement and Plan of Reorganization.
 
RECORD DATES; VOTING POWER (PAGES 17 - 18)
 
     You may vote at the Dominguez Special Meeting if you owned Dominguez shares
as of the close of business on March 16, 1999. You will have one vote for each
share of Dominguez common stock you owned on that date.
 
VOTE REQUIRED TO APPROVE THE MERGER (PAGE 17)
 
     To approve the merger, Dominguez shareholders that hold a majority of the
outstanding shares of Dominguez common stock entitled to vote at the Dominguez
Special Meeting must vote to approve the amended Agreement and Plan of
Reorganization. Directors and executive officers of Dominguez and their
affiliated corporations can vote approximately 32% of the shares entitled to be
voted at the Dominguez Special Meeting. Based on the unanimous recommendation of
the Dominguez Board in favor of the amended Agreement, we expect that the
directors and executive officers of Dominguez and certain of their affiliated
corporations will vote all of their shares to approve the amended Agreement,
although these affiliated corporations have not committed to do so.
 
     BECAUSE APPROVAL OF THE AMENDED AGREEMENT REQUIRES THE AFFIRMATIVE VOTE OF
A MAJORITY OF THE OUTSTANDING SHARES ENTITLED TO VOTE AT THE DOMINGUEZ SPECIAL
MEETING, ABSTENTIONS AND BROKER NON-VOTES WILL HAVE THE SAME EFFECT AS NEGATIVE
VOTES.
 
       ACCORDINGLY, THE DOMINGUEZ BOARD URGES YOU TO COMPLETE, DATE AND
       SIGN THE ACCOMPANYING PROXY CARD AND RETURN IT PROMPTLY IN THE
       ENCLOSED, POSTAGE PAID ENVELOPE.
 
EXCHANGE OF CERTIFICATES (PAGES 31 - 32)
 
     If we complete the merger, your shares of Dominguez common stock will be
converted into shares of Group common stock. If you are a holder of Dominguez
stock certificates or certificates are held for you in street name, you will
need to exchange them for new certificates. These new certificates will
represent shares of Group common stock.
 
     If we complete the merger, Dominguez shareholders will receive detailed
instructions on how to exchange their shares. PLEASE DO NOT SEND US ANY STOCK
CERTIFICATES UNTIL YOU RECEIVE THESE INSTRUCTIONS.
 
WHAT NEEDS TO BE DONE TO COMPLETE THE MERGER (PAGES 39 - 40)
 
     The completion of the merger depends on a number of conditions being met.
In addition to compliance by Group and Dominguez with the terms of the amended
Agreement and Plan of Reorganization, these include: (1) Dominguez shareholders
must approve the amended Agreement; (2) Dominguez and Group
                                        5
<PAGE>   14
 
must receive all required regulatory approvals and any waiting periods required
by law must have passed; (3) there must be no actual or threatened governmental
action or proceeding blocking or trying to block the merger; (4) the opinion
received from Group's independent public accountants that no gain or loss would
be recognized for U.S. federal income tax purposes by Group or Dominguez as a
result of the merger or by the shareholders of Dominguez who receive solely
stock in the merger may not be withdrawn or modified in any material respect ;
(5) the New York Stock Exchange must approve for listing the shares that Group
will issue in the merger; and (6) Group must receive a letter from its
independent public accountants stating that the merger will qualify for "pooling
of interest" accounting treatment.
 
     Unless prohibited by law, either Dominguez or Group could waive any
condition to the merger that has not been satisfied and complete the merger.
Dominguez cannot be certain whether or when any of these conditions will be
satisfied, or waived where permissible, or that the merger will be completed.
 
TERMINATION OF THE AMENDED AGREEMENT AND PLAN OF REORGANIZATION (PAGES 40 - 41)
 
     Dominguez and Group can agree at any time to terminate the amended
Agreement and Plan of Reorganization without completing the merger, even if the
shareholders of Dominguez have already voted to approve it.
 
     Either Group or Dominguez also can terminate the amended Agreement if,
among other things: (1) any governmental body whose approval is necessary to
complete the merger, including the California Public Utilities Commission, makes
a final decision not to approve the merger; (2) the merger is not completed by
November 13, 1999, unless that date is extended pursuant to the terms of the
amended Agreement; (3) the Dominguez shareholders do not approve the amended
Agreement; (4) prior to the effective time of the merger, Group's independent
public accountants have not delivered their opinion to Group that the merger
will be accounted for as a pooling of interests; (5) the conditions to the
merger have not been met by November 13, 1999 or any permitted extension; (6)
the Dominguez Board takes certain actions relating to an unsolicited competing
transaction that the Dominguez Board concludes is a superior proposal to the
terms set forth in the amended Agreement; or (7) either Group or Dominguez
materially violates any of its obligations under the amended Agreement. The
party seeking to terminate cannot itself have materially breached the amended
Agreement. Group can also terminate the amended Agreement if 5% or more of the
Dominguez shares become dissenting shares.
 
CERTAIN PAYMENTS UPON TERMINATION OF AGREEMENT AND PLAN OF REORGANIZATION (PAGE
38)
 
     The amended Agreement provides that Dominguez will pay Group as liquidated
damages the sum of $1.5 million if the merger is not consummated due to certain
actions by Dominguez relating to alternative transactions. Furthermore, if the
merger is not consummated, and within 24 months of the effective date of the
termination of the amended Agreement, Dominguez consummates another merger,
consolidation or similar transaction that is superior to the merger, Dominguez
will pay to Group, $1.2 million in liquidated damages (in addition to the $1.5
million discussed above). If the amended Agreement is terminated by either party
as the result of a material breach by the other party, then the breaching party
shall pay to the non-breaching party the out-of-pocket expenses and fees
incurred by the non-breaching party, not to exceed $1.5 million. If, however,
prior to termination of the amended Agreement or during the twelve month period
following termination of the amended Agreement, Group enters into another
agreement to acquire, merge, or consolidate with another entity, which by its
terms requires that the transactions contemplated by the amended Agreement shall
not be completed by November 13, 1999, or any permitted extension, or which
transaction any governmental entity advised Group in writing would result in the
disapproval of the transactions contemplated in the amended Agreement, then
Dominguez would be entitled to all other rights and remedies available to it at
law or in equity, without regard to the $1.5 million limit. In addition, if the
Dominguez shareholders do not approve the amended Agreement, then Dominguez must
pay all of Group's out-of-pocket expenses relating to the merger, not to exceed
$1.5 million. If the California Public Utilities Commission or any other
regulatory authority does not approve the merger, then Group must pay all
Dominguez' out-of-pocket expenses relating to the merger, not to exceed $1.5
million. See "Termination of the Amended Merger Agreement."
 
                                        6
<PAGE>   15
 
FEDERAL INCOME TAX CONSEQUENCES (PAGES 41 - 42)
 
     Dominguez expects that as a shareholder you will not recognize any gain or
loss for U.S. federal income tax purposes in the merger, except in connection
with any cash that you might receive instead of fractional shares. Dominguez has
received an opinion from Group's independent public accountants, KPMG LLP, that
this will be the case. This opinion will not bind the Internal Revenue Service,
which could take a different view. This tax treatment will not apply to any
Dominguez shareholder who exercises and perfects dissenters' rights under
California law.
 
     Determining the actual tax consequences of the merger to you as an
individual taxpayer can be complicated. The tax treatment will depend on your
specific situation and many variables not within our control. You should consult
your own tax adviser for a full understanding of the merger's tax consequences.
 
ACCOUNTING TREATMENT (PAGE 42)
 
     Dominguez and Group expect the merger to qualify as a "pooling of
interests," which means that, for accounting and financial reporting purposes,
the companies will be treated as if they had always been one company.
 
OPINIONS OF FINANCIAL ADVISOR (PAGES 25 - 30)
 
     The Dominguez Board has received the opinion of its financial adviser,
PaineWebber Incorporated, that the exchange ratio contained in the amended
Agreement and Plan of Reorganization is fair to the holders of Dominguez common
stock from a financial point of view. The opinion, dated April 7, 1999 updates
PaineWebber's original opinion dated November 13, 1998 and is attached to this
Proxy Statement-Prospectus as Appendix "B". PaineWebber's original opinion is
attached to this Proxy Statement-Prospectus as Appendix "C."
 
     You should read the opinions carefully to understand the procedures
followed, assumptions made, matters considered and limitations and review
undertaken by PaineWebber in rendering its opinions. Dominguez has paid
PaineWebber a retention fee of $50,000 and a fee of $400,000 for the rendering
of its opinion. In addition, Dominguez has agreed to pay PaineWebber the balance
of its fee if the merger is completed which would be approximately $350,000.
Dominguez also has agreed to reimburse PaineWebber for its reasonable
out-of-pocket expenses, including attorneys' fees.
 
BOARD OF DIRECTORS, MANAGEMENT AND OPERATIONS OF GROUP FOLLOWING THE MERGER
(PAGES 59 - 63)
 
  THE BOARD OF DIRECTORS:
 
     The Board of Directors of Group currently has nine members. The amended
Agreement and Plan of Reorganization provides that at the effective time of the
merger, Group will add one of the then current directors of Dominguez to Group's
Board, increasing the total number of Group directors to ten.
 
  MANAGEMENT AND OPERATIONS:
 
     Pursuant to the merger, Dominguez will merge into Cal Water under the terms
of the amended Agreement and Plan of Reorganization. The Dominguez subsidiaries
will be operated as subsidiaries of Cal Water. These operations will be managed
by the management team of Group and Cal Water after the merger. Group has agreed
to offer all Dominguez employees employment following the merger on terms
comparable to their current employment terms with Dominguez.
 
INTEREST OF PERSONS INVOLVED IN THE MERGER THAT ARE DIFFERENT FROM YOURS (PAGE
30 - 31)
 
     Two executive officers of Dominguez have interests in the amended Agreement
and Plan of Reorganization that are different from your interests. The person
who serves as Chairman of the Board, President and Chief Executive Officer of
Dominguez and the person who serves as Vice President, Secretary and Chief
Financial Officer of Dominguez have received offers of employment from Cal Water
regarding employment after the merger. In addition, the amended Agreement
provides that immediately before the effective time of the merger, Group will
select one Dominguez director to serve as a Group director. The Board of
Directors of Dominguez was aware of these interests and took them into account
in approving the amended Agreement.
 
                                        7
<PAGE>   16
 
SOME DIFFERENCES IN RIGHTS OF SHAREHOLDERS (PAGES 64-66; 74-82)
 
     The rights of Dominguez shareholders are currently governed by the
California General Corporation Law, Dominguez' Articles of Incorporation and its
Bylaws. The rights of Group shareholders are currently governed by the
California General Corporation Law, Group's Articles of Incorporation and
Group's Bylaws. Group is seeking approval by its shareholders to reincorporate
in Delaware. If the merger is completed, you will become shareholders of Group
and your rights will be governed by Group's Articles of Incorporation and Bylaws
and, if Group reincorporates in Delaware, your rights as a shareholder would be
governed by Delaware law rather than California law. See "Comparison of
Shareholder Rights" and "Group Reincorporation as a Delaware Corporation." The
shareholders of Group will meet on April 21, 1999 to act on a proposal to
reincorporate Group as a Delaware corporation.
 
DISSENTERS' RIGHT (PAGES 44 - 46)
 
     California law permits holders of Dominguez common stock to dissent from
the merger and to have the fair value of their stock appraised by a court and
paid to them in cash, only if 5% or more of the shares of Dominguez common stock
exercise their dissenters' rights. To do this, the holders of these shares must
follow required procedures, including filing notices with Dominguez and either
abstaining or voting against the merger. If you hold shares of Dominguez common
stock and follow the required formalities regarding dissenting shares, at least
5% of the holders of Dominguez common stock exercise their dissenters' rights
and the merger is completed, your shares will not become shares of Group common
stock. Instead, your only right will be to receive the appraised value of your
shares in cash. We have attached the applicable provisions of California law
related to dissenters' rights to this Proxy Statement-Prospectus as Appendix
"D". Group may terminate the amended Agreement and Plan of Reorganization if 5%
or more of the Dominguez outstanding shares are dissenting shares.
 
REGULATORY APPROVALS (PAGES 42-44)
 
     The companies cannot complete the merger unless they obtain the approval of
the California Public Utilities Commission and the consent of the Federal Trade
Commission. The companies intend to file all of the required notices and
applications with these regulatory authorities. As of the date of this Proxy
Statement-Prospectus, the companies have not received any required approvals.
The companies expect that the decision of the California Public Utilities
Commission regarding approval of the merger will not be received prior to the
last calendar quarter of this year. While Dominguez does not know of any reason
why all regulatory approvals should not be obtained in a timely manner, it
cannot be certain when or if the companies will obtain them.
 
FORWARD-LOOKING STATEMENTS; RISK FACTORS (PAGES 2 AND 9 - 10)
 
     Each company makes forward-looking statements in this document, and in the
public documents to which we refer, that are subject to risks and uncertainties.
These forward-looking statements include information about possible or assumed
future results of our operations or the performance of Group after the merger.
Also, when we use any of the words "believes," "expects," "anticipates" or
similar expressions, we are making forward-looking statements. Many possible
events or factors could affect the future financial results and performance of
Group after the merger. This could cause actual results or performance to differ
materially from those expressed in our forward-looking statements. You should
consider these risks when you vote on the merger. See "Forward Looking
Statements" and "Risk Factors."
 
                                        8
<PAGE>   17
 
                                  RISK FACTORS
 
     In deciding on the merger proposal in this Proxy Statement-Prospectus, you
should carefully consider the risks described below, elsewhere in this Proxy
Statement-Prospectus and in the documents that Group and Dominguez have
incorporated into this Proxy Statement-Prospectus by reference. This Proxy
Statement-Prospectus contains forward-looking statements that involve known and
unknown risks and uncertainties. See "Forward-Looking Statements." The matters
set forth below are cautionary statements identifying important factors with
respect to such forward-looking statements, including risks and uncertainties
that could cause actual results to differ materially and adversely from those in
such forward-looking statements.
 
RISKS RELATED TO MERGER
 
     Difficulties of Integrating Two Companies. The merger may not achieve
anticipated benefits for shareholders unless Group successfully combines its
operations with those of Dominguez and integrates the two companies' services in
a timely manner. Integrating Group and Dominguez could be a complex, time
consuming and expensive process and may result in revenue disruption if not
completed in a timely and efficient manner. Prior to the merger, Group and
Dominguez will have operated independently, each with its own business, business
culture, customers, employees and systems. Following the merger, Group must
operate as a combined organization utilizing common information communication
systems, operating procedures, financial controls and human resource practices,
including benefit, training and professional development programs. There may be
unforseen difficulties, costs and delays involved in integrating Group and
Dominguez. The failure to integrate Group and Dominguez may have a material
adverse effect on the business, financial condition and results of operations of
Group after the merger.
 
     Risks Associated with Exchange Ratio. As of the time of the merger, each
outstanding share of Dominguez common stock will be converted into a minimum of
1.25 and a maximum of 1.49 shares of Group common stock. The exact exchange
ratio will depend upon the actual market price of Group common stock for a
twenty trading day period preceding the consummation of the Merger. Because the
exchange ratio is subject to a maximum and a minimum, it will have limited
ability to increase or decrease due to fluctuations in the market price of Group
common stock. The specific value of the consideration to be received by
Dominguez shareholders in the merger will depend on the market price of Group
common stock at the effective time of the merger. We anticipate that the merger
will not occur prior to the last calendar quarter of 1999. The market prices of
Group common stock and Dominguez common stock as of a recent date are set forth
in this Proxy Statement-Prospectus under "Comparative per Share Market Price and
Dividend Information." We advise you to obtain recent market quotations for
Group common stock and Dominguez common stock as the Dominguez Special Meeting
approaches. Group common stock and Dominguez common stock historically have been
subject to price volatility. We cannot assure you as to the market prices of
Group common stock or Dominguez common stock at any time before the time of the
merger or as to the market price of Group common stock at any time after the
merger.
 
     Substantial Expenses Resulting from the Merger. Group and Dominguez
estimate that the negotiation and implementation of the merger will result in
substantial aggregate pre-tax expenses to Group and Dominguez, primarily
relating to costs associated with combining the operations of the two companies
and the fees of financial advisors, attorneys and accountants. There can be no
assurance that unanticipated contingencies will not substantially increase the
costs of combining the operations of the two companies.
 
     Rights of Holders of Dominguez Common Stock Following the Merger. As of the
effective time of the merger, Dominguez shareholders will become Group
shareholders. There are important differences between the rights of shareholders
of Dominguez and shareholders of Group. For a description of these differences,
see "Comparison of Shareholders' Rights." Also, Group is considering
reincorporating in Delaware. If this occurs, your rights as a Group shareholder
after the merger would be governed by Delaware law. See "Group Reincorporation
as a Delaware Corporation."
 
     California Public Utilities Commission. Group's principal operating
subsidiary, California Water Service Company, and Dominguez' principal operating
subsidiary, Dominguez Water Corporation, are both subject to the jurisdiction of
the California Public Utilities Commission, which must approve the merger and
certain
                                        9
<PAGE>   18
 
related matters. Accordingly, Cal Water and Dominguez Water Corporation have
filed a joint application with the Commission seeking its approval of the merger
and certain related matters. As of the date of this Proxy Statement-Prospectus,
two protests to the application have been filed. Both protests raise issues
related to the benefits accruing to rate payers as a result of the merger. The
merger cannot be completed without the Commission's approval and it can proceed
only on the terms and subject to any conditions and restrictions imposed by the
Commission. To approve the merger, the Commission must conclude that the merger
is in the public interest, including the interest of the ratepayers served by
the companies. The Commission may attach such terms, conditions and restrictions
to its approval of the merger as it deems appropriate or necessary. The law
requires that the Commission rule on the application within 18 months of its
filing (approximately, August 1, 2000). Dominguez can give no assurance when or
how the Commission will rule on the application, and what terms, conditions or
restrictions, if any, the Commission might impose on any approval by it of the
merger. If any such terms, conditions or restrictions are not acceptable to both
Dominguez and Group, the merger might not proceed. Furthermore, any such terms,
conditions or restrictions could materially and adversely affect the anticipated
future revenues of Group following the merger.
 
                                       10
<PAGE>   19
 
                       COMPARATIVE PER SHARE MARKET PRICE
                            AND DIVIDEND INFORMATION
 
     Group common stock is listed on the New York Stock Exchange ("NYSE") under
the trading symbol "CWT." As of March 25, 1999, Group common stock was held of
record by approximately 11,000 persons. Dominguez common stock is listed on the
Nasdaq National Market tier of the Nasdaq Stock Market under the trading symbol
"DOMZ." As of March 1, 1999, Dominguez common stock was held of record by
approximately 309 persons.
 
     The following table sets forth the high and low sale prices for Group
common stock as reported by the NYSE Composite Transactions and Dominguez common
stock as reported by the Nasdaq National Market tier of The Nasdaq Stock Market
(the "Nasdaq") and the dividends paid by each company.
 
<TABLE>
<CAPTION>
                                       CALIFORNIA WATER SERVICE           DOMINGUEZ SERVICES
                                             GROUP(1)(2)                  CORPORATION(3)(4)
                                     ----------------------------    ----------------------------
                                     PRICE PER COMMON                PRICE PER COMMON
                                     ----------------    DIVIDEND    ----------------    DIVIDEND
                                      HIGH      LOW        PAID       HIGH      LOW        PAID
                                     ------    ------    --------    ------    ------    --------
<S>                                  <C>       <C>       <C>         <C>       <C>       <C>
YEAR ENDED DECEMBER 31, 1996
First Quarter......................  $18.63    $16.25     $0.260     $12.67    $11.50    $0.2075
Second Quarter.....................   17.81     16.75      0.260      15.17     12.00     0.2075
Third Quarter......................   19.13     16.25      0.260      15.67     13.67     0.2075
Fourth Quarter.....................   21.88     17.94      0.260      15.67     14.83     0.2075
YEAR ENDED DECEMBER 31, 1997
First Quarter......................   22.63     19.50      0.264      16.33     15.00     0.2175
Second Quarter.....................   23.88     18.63      0.264      17.33     15.67     0.2175
Third Quarter......................   25.22     21.13      0.264      17.67     15.33     0.2175
Fourth Quarter.....................   29.59     23.44      0.264      21.50     17.00     0.2175
YEAR ENDED DECEMBER 31, 1998
First Quarter......................   33.75     24.31     0.2675      23.13     18.50      0.230
Second Quarter.....................   30.19     21.50     0.2675      19.50     17.00      0.230
Third Quarter......................   27.69     20.75     0.2675      23.50     17.50      0.230
Fourth Quarter.....................   33.13     21.25     0.2675      31.25     21.25      0.230
YEAR ENDED DECEMBER 31, 1999
First Quarter [March 25, 1999].....   31.75     23.38    0.27125      31.50     26.25      0.240
</TABLE>
 
- ---------------
(1) Group was organized in 1997 as the holding company of California Water
    Service Company, a regulated utility, and CWS Utility Services, a new entity
    which provides non-regulated water utility services. The stock prices, for
    periods prior to the first quarter of 1998, reflect the prices for the
    common stock of California Water Service Company.
 
(2) The stock prices and dividends of Group have been restated to reflect the
    effective 2-for-1 stock split on December 31, 1997.
 
(3) The stock prices and dividends of Dominguez have been restated to reflect
    the 3-for-2 stock split on January 2, 1998.
 
(4) If the merger is consummated and the Group and Dominguez quarterly dividends
    for the first quarter of 1999 were to remain unchanged following the merger,
    Dominguez shareholders would receive an increase in quarterly dividends. The
    increase will be determined based on the exact exchange ratio of Dominguez
    common stock into Group common stock. The exchange ratio can range from 1.25
    to 1.49 shares of Group common stock for each outstanding share of Dominguez
    common stock depending upon the market value of Group common stock during a
    twenty trading day period prior to and including the day which is five
    trading days prior to the effective time of the merger. See "Description of
    the Merger" for a detailed explanation of the exchange ratio provisions and
    application. The timing and amount of future Group dividends after the
    merger will depend upon earnings, cash requirements, the financial condition
    of Group, applicable government regulations and other factors deemed
    relevant to the Board of Directors of Group.
 
                                       11
<PAGE>   20
 
           SUMMARY HISTORICAL AND UNAUDITED PRO FORMA FINANCIAL DATA
                             OF GROUP AND DOMINGUEZ
 
     The selected historical financial data set forth below with respect to
Group's consolidated income statements for each of the five years in the period
ended December 31, 1998, and with respect to Group's consolidated balance sheets
at December 31, 1998, 1997, 1996, 1995 and 1994, are derived from the audited
consolidated financial statements of Group, as of and for each of the years in
the three year period ended December 31, 1998 and as of December 31, 1998 and
1997, which are incorporated by reference into this Proxy Statement-Prospectus,
and are qualified by reference to such financial statements and the notes
thereto. The summary financial information presented below for 1995 and 1994
have been derived from audited consolidated financial statements previously
filed with the Securities and Exchange Commission but not incorporated by
reference in this Proxy Statement-Prospectus. The selected historical financial
data set forth below with respect to the consolidated income statements of
Dominguez for each of the five years in the period ended December 31, 1998 and
with respect to Dominguez consolidated balance sheets at December 31, 1998,
1997, 1996, 1995 and 1994 are derived from the audited consolidated financial
statements of Dominguez, as of and for each of the years in the three year
period ended December 31, 1998 and as of December 31, 1998 and 1997, which are
incorporated by reference into this Proxy Statement-Prospectus, and are
qualified by reference to such financial statements and the notes thereto. The
summary financial information presented below for 1995 and 1994 have been
derived from audited consolidated financial statements previously filed with the
Securities and Exchange Commission but not incorporated by reference in this
Proxy Statement-Prospectus.
 
     The selected unaudited pro forma combined financial data represent the
combination of Group and Dominguez for each of the years in the five years ended
December 31, 1998 on a "pooling-of-interest" basis. See "Unaudited Pro Forma
Condensed Combined Financial Information."
 
     The data set forth below are qualified by reference to, and should be read
in conjunction with, the related consolidated financial statements and the notes
thereto which are incorporated by reference into this Proxy
Statement-Prospectus.
 
                                       12
<PAGE>   21
 
                         CALIFORNIA WATER SERVICE GROUP
 
                       SELECTED HISTORICAL FINANCIAL DATA
            (DOLLAR AMOUNTS IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
 
<TABLE>
<CAPTION>
                                                        FOR THE YEAR ENDED DECEMBER 31,
                                              ----------------------------------------------------
                                                1998       1997       1996       1995       1994
                                              --------   --------   --------   --------   --------
<S>                                           <C>        <C>        <C>        <C>        <C>
INCOME STATEMENT DATA:
  Operating revenue.........................  $186,273   $195,324   $182,764   $165,086   $157,271
  Net income................................    18,395     23,305     19,067     14,698     14,408
  Net income available to common stock......    18,242     23,152     18,914     14,545     14,255
PER COMMON SHARE DATA:(1)
  Basic/diluted earnings per share..........  $   1.45   $   1.83   $   1.50   $   1.16   $   1.22
  Cash dividends declared and paid per
     common share...........................      1.07      1.055       1.04       1.02       0.99
  Book value per common share...............     13.38      13.00      12.22      11.72      11.56
BALANCE SHEET DATA:
  Total assets..............................  $548,499   $531,297   $512,390   $497,626   $462,794
  Capitalization:
     Common shareholders' equity............   168,804    164,065    154,226    146,949    144,447
     Preferred stock........................     3,475      3,475      3,475      3,475      3,475
     Long-term debt, including current
       portion..............................   138,585    139,205    142,153    145,540    128,944
                                              --------   --------   --------   --------   --------
  Total capitalization......................  $310,864   $306,745   $299,854   $295,964   $276,866
                                              ========   ========   ========   ========   ========
</TABLE>
 
- ---------------
(1) All Group information has been restated to reflect the effective 2-for-1
    stock split on December 31, 1997.
 
                                       13
<PAGE>   22
 
                         DOMINGUEZ SERVICES CORPORATION
 
                       SELECTED HISTORICAL FINANCIAL DATA
            (DOLLAR AMOUNTS IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
 
<TABLE>
<CAPTION>
                                                           FOR THE YEAR ENDED DECEMBER 31,
                                                   -----------------------------------------------
                                                    1998      1997      1996      1995      1994
                                                   -------   -------   -------   -------   -------
<S>                                                <C>       <C>       <C>       <C>       <C>
INCOME STATEMENT DATA:
  Operating revenue..............................  $25,267   $26,818   $24,705   $25,486   $23,569
  Net income before extraordinary item...........    1,423     2,021     1,981     1,953     1,932
  Extraordinary item, net of $315 of income
     taxes.......................................     (499)       --        --        --        --
                                                   -------   -------   -------   -------   -------
  Net income.....................................      924     2,021     1,981     1,953     1,932
                                                   =======   =======   =======   =======   =======
  Net income available to common stock...........      924     2,021     1,981     1,953     1,932
PER COMMON SHARE DATA:(1)
  Earnings per share before extraordinary item...  $  0.94   $  1.34   $  1.31   $  1.29   $  1.28
  Basic/diluted earnings per share...............  $  0.61   $  1.34   $  1.31   $  1.29   $  1.28
  Cash dividends declared and paid per common
     share.......................................     0.92      0.87      0.83      0.77      0.73
  Book value per common share....................    10.54     10.85     10.37      9.89      9.35
BALANCE SHEET DATA:
  Total assets...................................  $52,635   $51,661   $46,875   $45,295   $44,652
  Capitalization:
     Common shareholders' equity.................   15,879    16,341    15,626    14,896    14,092
     Preferred stock.............................       --        --        --        98        98
     Long-term debt, including current portion...   11,273    11,258     7,885     7,354     7,645
                                                   -------   -------   -------   -------   -------
  Total capitalization...........................  $27,152   $27,599   $23,511   $22,348   $21,835
                                                   =======   =======   =======   =======   =======
</TABLE>
 
- ---------------
(1) All Dominguez information has been restated to reflect the 3-for-2 stock
    split on January 2, 1998.
 
                                       14
<PAGE>   23
 
                 SELECTED PRO FORMA COMBINED FINANCIAL DATA OF
       CALIFORNIA WATER SERVICE GROUP AND DOMINGUEZ SERVICES CORPORATION
            (DOLLAR AMOUNTS IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
                                  (UNAUDITED)
 
<TABLE>
<CAPTION>
                                                                  FOR THE YEAR ENDED DECEMBER 31,
                                                        ----------------------------------------------------
                                                          1998       1997       1996       1995       1994
                                                        --------   --------   --------   --------   --------
<S>                                                     <C>        <C>        <C>        <C>        <C>
INCOME STATEMENT DATA:
  Operating revenue...................................  $211,540   $222,142   $207,469   $190,572   $180,840
  Net income..........................................    19,319     25,326     21,048     16,651     16,340
  Net income available to common stock................    19,166     25,173     20,895     16,498     16,187
PER COMMON SHARE DATA:(1) Basic/diluted earnings per
  share...............................................  $   1.30   $   1.71   $   1.43   $   1.13   $   1.11
  Cash dividends declared and paid per common share...      1.05       1.03       1.01       0.99       0.96
  Book value per common share.........................     12.57      12.29      11.60      11.08      10.89
BALANCE SHEET DATA:
  Total assets........................................  $601,134   $582,958   $559,265   $542,921   $507,446
  Capitalization:
     Common shareholders' equity......................   184,683    180,406    169,852    161,845    158,539
     Preferred stock..................................     3,475      3,475      3,475      3,573      3,573
     Long-term debt, including current portion........   149,858    150,463    150,038    152,894    136,589
                                                        --------   --------   --------   --------   --------
  Total capitalization................................  $338,016   $334,344   $323,365   $318,312   $298,701
                                                        ========   ========   ========   ========   ========
</TABLE>
 
- ---------------
(1) All Group Pro Forma information has been restated to give effect to the
    effective Group 2-for-1 stock split on December 31, 1997, the Dominguez
    3-for-2 stock split on January 2, 1998 and a 1.37 exchange ratio equal to
    about 2,065,000 shares of Group common stock. 1.37 is the midpoint in the
    exchange ratio range which can vary from 1.25 to 1.49 shares of Group common
    stock for each outstanding share of Dominguez common stock depending upon
    the market value of Group common stock during a twenty trading day period
    prior to and including the day which is five trading days prior to the
    effective time of the merger. See "Description of the Merger" for a detailed
    explanation of the exchange ratio provisions and application.
 
(2) For the year ended December 31, 1998, Dominguez reported an extraordinary
    item related to merger expenses of $499,000, net of $315,000 of income
    taxes. The Pro Forma Combined Financial Data does not show this as an
    extraordinary item.
 
                                       15
<PAGE>   24
 
                           DOMINGUEZ SPECIAL MEETING
 
GENERAL
 
     Dominguez is first mailing this Proxy Statement-Prospectus to the holders
("Dominguez Shareholders") of its $1.00 par value common stock (the "Dominguez
Common Stock") on or about April   , 1999. It is accompanied by the Notice of
the Dominguez Special Meeting and a form of proxy card that the Board of
Directors of Dominguez (the "Dominguez Board") is soliciting for use at the
special meeting of Dominguez Shareholders (the "Dominguez Special Meeting") to
be held on May 12, 1999, at 10:00 a.m., local time, at Dominguez' corporate
headquarters located at 21718 South Alameda Street, Long Beach, California
90810, and at any adjournments or postponements thereof.
 
MATTERS TO BE CONSIDERED
 
     At the Dominguez Special Meeting, the Dominguez Shareholders will be asked
to consider and vote upon a proposal to approve the Agreement and Plan of
Reorganization, dated as of November 13, 1998, as amended by Amendment No. 1
dated March 22, 1999 (the "Amended Merger Agreement"), among Dominguez Services
Corporation, a California corporation ("Dominguez"), California Water Service
Group, a California corporation ("Group") and California Water Service Company,
a California corporation and wholly-owned subsidiary of Group ("Cal Water"), and
the transactions contemplated by that document. These transactions will include,
among other things, (a) the merger of Dominguez with and into Cal Water, so that
Cal Water is the surviving corporation in the merger (the "Merger") and (b) the
conversion of all outstanding shares of Dominguez Common Stock at the effective
time of the Merger (the "Effective Time"). The conversion ratio of Dominguez
common stock into Group no par value common stock (the "Group Common Stock")
(the "Exchange Ratio") will be equal to $33.75 divided by either (i) the market
price (defined as the average closing price per share of Common Stock on the New
York Stock Exchange ("NYSE") for each of the twenty consecutive trading days
prior to and including the fifth trading day prior to the Effective Time) of
Group Common Stock if the market price of Group Common Stock is not greater than
$27.00 and not less than $22.65, (ii) $27.00 if the market price of Group Common
Stock is greater than $27.00, in which case the Exchange Ratio shall equal 1.25,
or (iii) $22.65 if the market price of Group Common Stock is less than $22.65,
in which case the Exchange Ratio shall equal 1.49. The Dominguez Shareholders
may also be asked to vote upon a proposal to adjourn or postpone the Dominguez
Special Meeting, which adjournment or postponement could be used for the
purpose, among others, of allowing additional time to solicit additional votes
to approve the Amended Merger Agreement.
 
PROXIES
 
     If you are a Dominguez Shareholder, you may use the accompanying proxy card
to vote your shares of Dominguez Common Stock at the Dominguez Special Meeting
if you are unable to attend in person or if you wish to have your shares voted
by proxy even if you do attend the Dominguez Special Meeting. Your proxy may be
revoked by you at any time before it is exercised by submitting to the Secretary
of Dominguez written notice of revocation or a properly executed proxy of a
later date or by attending the Dominguez Special Meeting and electing to vote in
person. Written notices of revocation and other communications with respect to
the Dominguez proxies should be addressed to: Dominguez Services Corporation,
21718 South Alameda Street, Long Beach, California 90810, Attention: John S.
Tootle, Secretary. All shares of Dominguez Common Stock represented by valid
proxies received pursuant to this solicitation, and not revoked before they are
exercised, will be voted in the manner specified therein. If no vote is
specified, the proxies will be voted for approval of the Amended Merger
Agreement and the transactions contemplated thereby. The Dominguez Board is
unaware of any other matters that may be presented for action at the Dominguez
Special Meeting. If other matters do properly come before the Dominguez Special
Meeting, however, it is intended that shares represented by proxies in the
accompanying form will be voted or not voted by the persons named in the proxies
in their discretion, provided that no proxy that is voted against approval of
the Amended Merger Agreement will be voted in favor of any adjournment or
postponement of the Dominguez Special Meeting for the purpose of soliciting
additional proxies.
 
                                       16
<PAGE>   25
 
SOLICITATION OF PROXIES
 
     Dominguez will bear the entire cost of soliciting proxies from the
Dominguez Shareholders. In addition to the solicitation of the proxies by mail,
Dominguez will request banks, brokers and other record holders to send proxies
and proxy materials to the beneficial owners of the stock and secure their
voting instructions, if necessary. Dominguez will reimburse such record holders
for their reasonable expenses in so doing. If necessary, Dominguez may also use
several of its regular employees, who will not be specially compensated, to
solicit proxies from Dominguez Shareholders, either personally or by telephone,
telegram, facsimile or special delivery letter.
 
RECORD DATE AND VOTING RIGHTS
 
     Record Date. In accordance with the provisions of the California General
Corporation Law (the "CGCL"), Dominguez has fixed March 16, 1999 as the record
date for determining the Dominguez Shareholders entitled to notice of and to
vote at the Dominguez Special Meeting (the "Dominguez Record Date").
Accordingly, only Dominguez Shareholders of record at the close of business on
the Dominguez Record Date will be entitled to notice of and to vote at the
Dominguez Special Meeting. The number of outstanding shares of Dominguez Common
Stock entitled to vote at the Dominguez Special Meeting is approximately
1,560,709, held by approximately 309 holders of record.
 
     Quorum Requirement. The presence, in person or by proxy, of Dominguez
Common Stock representing a majority of the total voting power of such shares
entitled to vote on the Dominguez Record Date is necessary to constitute a
quorum at the Dominguez Special Meeting.
 
     Voting Rights. Each share of Dominguez Common Stock entitles its holder to
one vote.
 
     Votes Required. Under the CGCL, the affirmative vote of a majority of the
shares entitled to be voted at the Dominguez Special Meeting is required to
approve the Amended Merger Agreement and the transactions contemplated thereby.
 
     Abstentions and Broker Non-Votes. In accordance with California law, for
purposes of determining the presence or absence of a quorum, Dominguez intends
to count Dominguez Common Stock held by Dominguez Shareholders who are present
at the Dominguez Special Meeting but not voting, and Dominguez Common Stock for
which it has received proxies but with respect to which holders of such shares
have abstained, as present at the Dominguez Special Meeting. In addition, under
applicable rules of the National Association of Securities Dealers, brokers who
hold Dominguez Common Stock in "street" name for customers who are the
beneficial owners of such shares are prohibited from giving a proxy to vote
shares held for such customers with respect to the Amended Merger Agreement
without specific instructions from such customers. Dominguez Common Stock
represented by proxies returned by a broker holding such shares in nominee or
"street" name will be counted for purposes of determining whether a quorum
exists, even if such shares are not voted in matters where discretionary voting
by the broker is not allowed ("broker non-votes"). Although such proxies will be
counted for purposes of determining a quorum, abstentions from voting and broker
non-votes will not be deemed to have been cast either "for" or "against" the
Amended Merger Agreement at the Dominguez Special Meeting.
 
     NONETHELESS, BECAUSE APPROVAL OF THE AMENDED MERGER AGREEMENT REQUIRES THE
AFFIRMATIVE VOTE OF A MAJORITY OF THE OUTSTANDING SHARES ENTITLED TO VOTE AT THE
DOMINGUEZ SPECIAL MEETING, ABSTENTIONS AND BROKER NON-VOTES WILL HAVE THE SAME
EFFECT AS NEGATIVE VOTES. ACCORDINGLY, THE DOMINGUEZ BOARD URGES THE DOMINGUEZ
SHAREHOLDERS TO COMPLETE, DATE AND SIGN THE ACCOMPANYING PROXY CARD AND RETURN
IT PROMPTLY IN THE ENCLOSED, POSTAGE PAID ENVELOPE.
 
     As of the Dominguez Record Date, directors and executive officers of
Dominguez and certain affiliated corporations of certain of these directors
beneficially owned approximately 505,252 shares of Dominguez Common Stock,
entitling them to exercise approximately 32% of the voting power of the
Dominguez Common Stock entitled to vote at the Dominguez Special Meeting. As
stated above, the affirmative vote of
                                       17
<PAGE>   26
 
the majority of the shares entitled to be voted at the Dominguez Special Meeting
is required to approve the Amended Merger Agreement and the transactions
contemplated thereby. Based on the unanimous recommendation of the Dominguez
Board, it is currently expected that each such director and executive officer of
Dominguez and their affiliated corporations will vote their shares of Dominguez
Common Stock for approval of the Amended Merger Agreement and the transactions
contemplated thereby, although these affiliated corporations have not committed
to do so.
 
     Additional information with respect to beneficial ownership of Dominguez
Common Stock by persons and entities owning more than 5% of such stock and more
detailed information with respect to beneficial ownership of Dominguez Common
Stock by directors and executive officers of Dominguez is set forth in
"Information about Dominguez-Security Ownership of Certain Beneficial Owners of
Dominguez."
 
     A representative of Arthur Andersen, LLP, independent auditors of
Dominguez, will be present at the Dominguez Special Meeting and will have an
opportunity to make a statement if such representative so desires, and to
respond to appropriate questions raised at the Dominguez Special Meeting.
 
RECOMMENDATION OF THE DOMINGUEZ BOARD
 
     THE DOMINGUEZ BOARD HAS UNANIMOUSLY APPROVED THE AMENDED MERGER AGREEMENT
AND THE TRANSACTIONS CONTEMPLATED THEREBY. THE DOMINGUEZ BOARD BELIEVES THAT THE
AMENDED MERGER AGREEMENT AND THE TRANSACTIONS CONTEMPLATED THEREBY ARE FAIR TO
AND IN THE BEST INTERESTS OF DOMINGUEZ AND THE DOMINGUEZ SHAREHOLDERS AND
UNANIMOUSLY RECOMMENDS THAT THE DOMINGUEZ SHAREHOLDERS VOTE "FOR" THE APPROVAL
OF THE AMENDED MERGER AGREEMENT AND THE TRANSACTIONS CONTEMPLATED THEREBY. SEE
"THE MERGER-REASONS OF DOMINGUEZ FOR THE MERGER."
 
                                       18
<PAGE>   27
 
                                   THE MERGER
 
     THE FOLLOWING SUMMARY OF THE MATERIAL TERMS AND PROVISIONS OF THE MERGER
AGREEMENT IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO THE AMENDED MERGER
AGREEMENT, WHICH IS INCORPORATED HEREIN BY REFERENCE AND IS ATTACHED AS APPENDIX
A TO THIS PROXY STATEMENT-PROSPECTUS. ALL INFORMATION CONTAINED IN THIS PROXY
STATEMENT-PROSPECTUS WITH RESPECT TO GROUP HAS BEEN SUPPLIED BY GROUP FOR
INCLUSION HEREIN AND HAS NOT BEEN INDEPENDENTLY VERIFIED BY DOMINGUEZ. ALL
INFORMATION CONTAINED IN THIS PROXY STATEMENT-PROSPECTUS WITH RESPECT TO
DOMINGUEZ, HAS BEEN SUPPLIED BY DOMINGUEZ FOR INCLUSION HEREIN AND HAS NOT BEEN
INDEPENDENTLY VERIFIED BY GROUP. UNLESS OTHERWISE EXPRESSLY PROVIDED,
CAPITALIZED TERMS IN THE FOLLOWING DISCUSSION HAVE THE MEANINGS ATTRIBUTED TO
SUCH TERMS IN THE AMENDED MERGER AGREEMENT.
 
DESCRIPTION OF THE MERGER
 
     At the Effective Time, Dominguez will merge with and into Cal Water
pursuant to the Merger, so that (i) Cal Water is the surviving corporation in
the Merger ("Surviving Corporation") and (ii) Group continues as the ultimate
parent holding company for Cal Water after the Merger. The Merger will have the
effects prescribed under the CGCL. The Articles of Incorporation (the "Surviving
Company Articles") and Bylaws (the "Surviving Company Bylaws") will be those of
Cal Water, as in effect immediately prior to the Effective Time. However,
Dominguez Shareholders will become holders of Group Common Stock as a result of
the Merger, and Dominguez Shareholders should be aware that although Group is a
California corporation, it intends to seek approval of its shareholders to
reincorporate in Delaware. If this approval is obtained and Group becomes a
Delaware corporation, the rights of Dominguez Shareholders who become Group
shareholders as a result of the Merger will be governed by Delaware law, not
California law. See "Comparison of Shareholder Rights" and "Group
Reincorporation as a Delaware Corporation."
 
     At the Effective Time, automatically by virtue of the Merger and without
any action on the part of any party or any Dominguez Shareholder, each share of
Dominguez Common Stock issued and outstanding (excluding (i) shares of Dominguez
Common Stock held directly or indirectly, by Group or any of its wholly-owned
subsidiaries, or (ii) DSC Perfected Dissenting Shares) will be converted into
the right to receive a minimum of 1.25 shares and a maximum of 1.49 shares of
Group Common Stock.
 
     All holders of options to purchase shares of Dominguez Common Stock prior
to the Merger will have their option exercise rights accelerated by Dominguez so
that they may exercise all outstanding options held by them immediately prior to
the Merger. At the Effective Time, each option granted by Dominguez to purchase
shares of Dominguez Common Stock that is outstanding and unexercised immediately
prior thereto shall cease to represent a right to acquire shares of Dominguez
Common Stock. Currently, there are outstanding options to acquire 40,740 shares
of Dominguez Common Stock.
 
     It is expected that the market price of Group Common Stock will fluctuate
between the date of this Proxy Statement-Prospectus and the date on which the
Merger is consummated, and thereafter. Upon consummation of the Merger,
Dominguez shareholders will receive a minimum of 1.25 and a maximum of 1.49
shares of Group Common Stock for each share of Dominguez Common Stock they own.
The exact Exchange Ratio will be determined based on a formula, with $33.75 as
the numerator, and a denominator which is the average closing price for the
twenty consecutive trading days through the fifth trading day preceding the
Effective Time, with a cap of $27.00 and a floor of $22.65. Based on the closing
price of Group Common Stock on November 12, 1998 ($26 15/16), the Exchange Ratio
would be 1.25 and the value of Group Common Stock received in exchange for each
share of Dominguez Common Stock would be $33.75. Based on the closing price of
Group common stock on March 25, 1999 ($24  1/2), the Exchange Ratio would be
1.38 and the value of Group Common Stock received in exchange for each share of
Dominguez common stock would be $33.75.
 
                                       19
<PAGE>   28
 
     However, the actual value of shares of Group common stock received by
Dominguez shareholders could be higher than $33.75 per Dominguez share if the
average closing price of Group common stock for the twenty trading days ending
on the fifth trading day before the closing is higher than $27.00, and could be
lower than $33.75, if the average closing price for such period is lower than
$22.65. For further information concerning the historical market prices of Group
Common Stock and Dominguez Common Stock, see "Comparative Per Share Market Price
and Dividend Information." No assurances can be given concerning the market
value of Group Common Stock or Dominguez Common Stock before or after the
Effective Time of the Merger.
 
BACKGROUND OF THE MERGER
 
     On April 29, 1998, prior to an industry association meeting, Mr. Robert W.
Foy, Chairman of the Board of Directors of Group, and Mr. Peter C. Nelson,
President and Chief Executive Officer of Group, met with Mr. Brian J. Brady,
Chairman of the Board of Directors, President and Chief Executive Officer of
Dominguez, and Mr. John S. Tootle, Vice President, Secretary and Chief Financial
Officer of Dominguez, at Dominguez' corporate headquarters. The Group
representatives pointed out similarities in the two companies' histories and
cultures and expressed their interest in forming a long-term relationship
between the companies. The Dominguez representatives acknowledged the
similarities and informed Group that in the past Dominguez had informally
received similar inquiries from other water companies. After consideration of
such inquiries, the Dominguez Board had consistently decided that remaining
independent was in the best interest of Dominguez and its shareholders. The
Dominguez representatives also explained that the Dominguez Board was not
interested in spending the company's resources evaluating informal unsolicited
inquiries.
 
     The Dominguez representatives followed up the April 29, 1998 meeting with a
letter to Group restating the Dominguez Board's decision to remain independent
and its policy of not spending company resources to explore every informal
inquiry.
 
     In May 1998, Mr. Nelson contacted Mr. Brady to inform Dominguez that Group
had retained financial and legal advisors to advise Group on the possibility of
a merger with Dominguez. During the month of May, the Dominguez representatives
reported Group's interest to the Dominguez Board. On June 5, 1998, an ad hoc
committee of the Dominguez Board was convened to discuss unsolicited inquiries
in general and steps to take if a formal inquiry were received.
 
     On July 1, 1998, Mr. Nelson informed Mr. Brady that Group was interested in
pursuing a merger with Dominguez and to expect a formal proposal from Group. On
July 6, 1998, Mr. Brady received a written expression of interest from Mr.
Nelson setting forth the general terms of a proposed merger between Group and
Dominguez (the "Proposal").
 
     At its July 15, 1998 meeting, the Dominguez Board reviewed the Proposal and
the preliminary financial evaluation of the proposed transaction outlined in the
Proposal that had been prepared by the Chief Financial Officer of Dominguez. In
addition, Dominguez' outside general counsel outlined for the Dominguez Board
its legal obligations in considering the Proposal and the transaction
contemplated thereby. The Dominguez Board authorized management of Dominguez to
explore the Proposal with representatives of Group and to recommend to the
Dominguez Board a proposed financial advisor to evaluate the Proposal. On July
16, 1998, Mr. Brady and Mr. Tootle met with representatives of PaineWebber
Incorporated ("PaineWebber") to discuss the retention of PaineWebber as
Dominguez' financial advisor with respect to the Proposal.
 
     On July 30, 1998, the Dominguez Board held a special meeting to consider
retaining PaineWebber as financial advisor in connection with the transaction
proposed by Group. PaineWebber representatives presented to the Dominguez Board
the services that it would provide and a listing of the firm's experience
involving utility mergers and acquisitions. The Dominguez Board then approved
the retention of PaineWebber as financial advisor for Dominguez in connection
with the Proposal. The Dominguez Board also instructed management to develop a
time schedule for evaluating the transaction described in the Proposal.
 
     Over the course of the next two and a half weeks, representatives of the
companies had several telephone conversations to discuss further the possible
advantages and the terms of a proposed merger between the companies.
 
                                       20
<PAGE>   29
 
     On August 18, 1998, the Dominguez Board held another special meeting to
discuss and review the proposed transaction with Group. Representatives of
PaineWebber described valuation ranges for Dominguez and presented an earnings
accretion and dilution analysis relating to a potential merger of Dominguez with
Group based on such valuation ranges. PaineWebber also analyzed the internal
information prepared by Dominguez regarding the projected earnings growth of
Dominguez over the next several years. Following this presentation, the Board
concluded that based upon the valuation range of Dominguez developed by
PaineWebber, management, assisted by PaineWebber, should continue to evaluate
and hold preliminary discussions with Group representatives and cause to be
prepared a confidentiality and exclusivity agreement with Group to permit each
company to begin its due diligence review of the other party.
 
     Prior to the next Dominguez Board meeting, which was held on August 31,
1998, further discussions took place between the management of the two
companies. Their respective financial representatives also sought to confirm
that the proposed merger would be accretive to earnings for Group's
shareholders.
 
     At its August 31, 1998 Board meeting, the Dominguez Board reviewed with
management and PaineWebber representatives the discussions held with Group
representatives on these points. The Dominguez Board reviewed and authorized the
execution of the Confidentiality and Exclusivity Agreement with Group (which
provided, among other things, for Group to have a 60 day exclusivity period to
negotiate a definitive merger agreement with Dominguez), the commencement of
mutual due diligence between the companies, and for management and PaineWebber
to determine the essential terms and conditions of the proposed merger beyond
those that were contained in the Proposal and to report back to the Dominguez
Board.
 
     During the following week, the two companies and their respective legal and
financial advisors began their mutual due diligence review. During the same
period, senior management of the two companies, their financial advisors and
their legal representatives discussed the terms of a proposed merger agreement.
 
     On September 28 and 29, 1998, Dominguez senior management, together with
Dominguez' financial and legal advisors, met in San Jose, California with senior
management of Group and its financial and legal advisors to conduct reciprocal
due diligence regarding Group and Dominguez.
 
     During the next few weeks, discussions between management and
representatives of the companies continued, the mutual due diligence was
substantially concluded and a draft of a proposed merger agreement was delivered
to Dominguez and its representatives on or about October 19, 1998.
 
     On October 20, 1998, the Dominguez Board held a special meeting at which
senior management of Group made presentations to the Dominguez Board regarding
the history and current operations of Group and the benefits of combining the
two companies. At this meeting, PaineWebber representatives also updated for the
Board the status of their ongoing negotiations with Group representatives and
gave their preliminary comments to the first draft of a proposed merger
agreement prepared by Group's legal counsel. PaineWebber representatives also
reviewed with the Dominguez Board an updated financial analysis of the proposed
transaction based on the discussions to date with Group's financial
representatives.
 
     On October 26, 1998, senior management and the legal and financial advisors
of the two companies met in San Francisco to negotiate further the terms of a
merger agreement. The parties made significant progress in these negotiations,
but certain issues remained unresolved, including the purchase price for
Dominguez.
 
     At Dominguez' October 27, 1998 Board of Directors meeting, PaineWebber
representatives reviewed with the Dominguez Board the material terms of the
proposed merger with Group that had been negotiated to date and that would be
contained in the next draft of a merger agreement. The Dominguez Board
authorized management to continue negotiations with Group and provided
additional guidance in connection with its position on the unresolved issues
relating to the proposed merger.
 
     On November 11, 1998, Group communicated to Dominguez' financial advisors
the proposed exchange ratio of 1.18 and the reasons therefor, to be submitted to
the Dominguez Board for its consideration at its November 13, 1998 board
meeting.
 
     On November 13, 1998, the Dominguez Board met to review the final terms of
the proposed merger as set forth in the draft merger agreement and to receive a
fairness opinion from PaineWebber. Eight of
 
                                       21
<PAGE>   30
 
Dominguez' nine directors participated in the meeting. Prior to the meeting,
materials regarding the proposed merger had been distributed to the Dominguez
Board including the then most recent draft of the merger agreement and certain
exhibits thereto. At the meeting, counsel for Dominguez reviewed with the
Dominguez Board the terms of the proposed final form of the merger agreement and
representatives of PaineWebber reviewed the negotiations that led up to the
proposed exchange ratio of 1.18 shares contained in the merger agreement.
PaineWebber presented its report to the Dominguez Board, including an in-depth
discussion of the analysis performed in the engagement. PaineWebber delivered
its written opinion, dated as of November 13, 1998, that the proposed exchange
ratio to be received by the holders of Dominguez Common Stock in the proposed
merger was fair from a financial point of view to such holders. See "Opinion of
Financial Advisor." The Dominguez Board then unanimously approved the Merger as
originally contemplated in the Agreement and Plan of Reorganization dated
November 13, 1998 (the "Original Merger Agreement"), subject to certain final
changes to the Original Merger Agreement and clarification of the employment
offers made by Group to Dominguez' Chief Executive Officer and Chief Financial
Officer following the Merger. These changes to the Original Merger Agreement
were agreed to by Group following the meeting and final terms of the proposed
employment offers to the Dominguez officers were finalized on Sunday, November
15, 1998.
 
     The Original Merger Agreement was executed and delivered on behalf of both
companies on Sunday, November 15, 1998, and an announcement thereof was released
to the public on that date.
 
     Dominguez received several letters from American States Water Company
("American States") both before and after the execution of the Original Merger
Agreement expressing an interest in a possible merger transaction with
Dominguez. Dominguez received the first of these letters shortly before the
Dominguez Board approved the Original Merger Agreement. The Dominguez Board and
its financial advisor reviewed and evaluated this expression of interest. The
Dominguez Board concluded that the expression of interest did not contemplate a
transaction that would be superior to the Merger.
 
     Dominguez received another written expression of interest from American
States on December 3, 1998. The Dominguez Board and its financial advisor
reviewed and evaluated this expression of interest. The Dominguez Board
concluded that the December 3, 1998 expression of interest did not contemplate a
transaction that would be superior to the Merger.
 
     Dominguez received a third written expression of interest from American
States on December 21, 1998, and subsequently received another letter from it
dated January 21, 1999, reconfirming the interest expressed in its December 21,
1998 letter. The Dominguez Board and its financial advisor reviewed and
evaluated the December 21, 1998 expression of interest. The Dominguez Board
concluded that it could not determine if this expression of interest
contemplated a transaction that would be superior to the Merger due to the very
preliminary nature of the expression of interest and certain assumptions and
numerous contingencies contained therein. Accordingly, as required by the terms
of the Original Merger Agreement, Dominguez did not pursue any discussions or
negotiations with American States.
 
     On February 9, 1999, Dominguez received an unsolicited proposal from
American States to acquire all Dominguez Common Stock. This proposal
contemplated a stock-for-stock merger pursuant to which each outstanding share
of Dominguez Common Stock would be exchanged for 1.23 shares of American States
common stock.
 
     On February 12, 1999, the Dominguez Board, based upon the advice of
PaineWebber, determined that this proposal, with a contemplated exchange ratio
of 1.23 shares of American States common stock for each share of Dominguez
Common Stock outstanding, was an unsolicited Competing Transaction and may be a
Superior Proposal, as those terms were defined in the Original Merger Agreement.
Based on the direction of the Dominguez Board, in accordance with the terms of
the Original Merger Agreement, Dominguez management provided Group with written
notice that it had received an unsolicited Competing Proposal from American
States that may be a Superior Proposal.
 
     Subsequent to this notice and as permitted under the Original Merger
Agreement, Dominguez and American States executed a mutual confidentiality
agreement and, over a three week period, conducted
 
                                       22
<PAGE>   31
 
negotiations and mutual due diligence reviews, and met with their respective
financial advisors and legal representatives.
 
     After further negotiations, on March 12, 1999, American States notified
Dominguez that it had revised its proposal to provide that each outstanding
share of Dominguez Common Stock would be exchanged for a minimum of 1.11 and a
maximum of 1.35 shares of common stock of American States, with the intent to
deliver to Dominguez shareholders approximately $32.50 in market value of
American States Common Stock for each outstanding share of Dominguez Common
Stock. The exact number of such shares that would be delivered would be
determined based on the market price of American States common stock during a
ten day period preceding the effective time of the proposed merger. Based on the
closing price of American States common stock on March 12, 1999, an exchange
ratio of 1.23 shares (the midpoint between the minimum exchange ratio of 1.11
and the maximum exchange ratio of 1.35) would have resulted in a market value in
shares of American States common stock equal to $32.50 for each share of
outstanding Dominguez Common Stock. American States representatives then
prepared and negotiated with Dominguez representatives a merger agreement which
contained substantially identical terms to the terms of the Original Merger
Agreement, except for the exchange ratio described above and the agreement of
American States to pay all termination fees that Dominguez would be obligated to
pay Group under the Original Merger Agreement. These termination fees could have
ranged from $1.5 to $2.7 million.
 
     On March 16, 1999, the Dominguez Board determined, based upon the advice of
PaineWebber, that the terms of the proposed merger agreement with American
States were more favorable to Dominguez shareholders than the terms of the
Original Merger Agreement, and therefore constituted a Superior Proposal as
defined in the Original Merger Agreement. In accordance with the terms of the
Original Merger Agreement, the Dominguez Board notified Group in writing of this
determination on March 16, 1999.
 
     On March 19, 1999, Group representatives informed Dominguez representatives
that Group was willing to amend the Original Merger Agreement to provide for the
revised Exchange Ratio. On March 22, 1999, the Group Board met and approved a
proposed amendment to the Original Merger Agreement incorporating this revised
Exchange Ratio. Later that day, the Dominguez Board met to review the proposed
amendment to the Original Merger Agreement. PaineWebber advised the Dominguez
Board that the revised Exchange Ratio was more favorable to Dominguez
shareholders than the terms of the American States proposal. The Dominguez Board
then approved the amendment to the Merger Agreement which was executed by
Dominguez and Group on March 22, 1999.
 
     On March 26, 1999 American States announced that it was terminating its
pending proposal to acquire Dominquez.
 
     As of the date of this Proxy Statement-Prospectus, PaineWebber also has
delivered its opinion to Dominguez that as of the date of this Proxy
Statement-Prospectus the revised Exchange Ratio to be used in the Merger is fair
to the holders of Dominguez Common Stock from a financial point of view.
 
REASONS OF DOMINGUEZ FOR THE MERGER; RECOMMENDATION OF DOMINGUEZ BOARD OF
DIRECTORS
 
     In reaching its determination to approve the Amended Merger Agreement and
the related transactions, the Dominguez Board consulted with management as well
as its financial and legal advisors, and considered a number of factors,
including the following:
 
     - An analysis of the historical and projected financial performance,
       business, operations, financial condition, earnings and prospects of
       Dominguez and Group and the historical stock price performance of the
       Group Common Stock.
 
     - The current and prospective economic environment facing investor-owned
       water utilities, and Dominguez in particular, including the continued
       consolidation in the industry and the increasing importance of financial
       resources in maintaining efficient water systems that comply with
       applicable federal and state water quality requirements.
 
                                       23
<PAGE>   32
 
     - A review of the pro forma internal projections for Group following the
       Merger prepared by Group's management and reviewed by Dominguez
       management and Dominguez' financial advisor, and other internal
       evaluations prepared by Dominguez management.
 
     - The terms of the Merger Agreement, including the fact that the Exchange
       Ratio reflected a premium of approximately 44% to Dominguez Shareholders
       based on the closing prices of Group Common Stock and Dominguez Common
       Stock on November 12, 1998 (the last trading date prior to the approval
       of the Merger by the Dominguez Board) and a premium of 11% based on
       closing prices as of March 25, 1999, an expected increase in dividends to
       Dominguez Shareholders following the Merger (59% based upon 1998
       dividends paid by Dominguez and Group), and an expected increase in the
       book value per share for Dominguez Shareholders as a result of a
       favorable Exchange Ratio in the Merger (20% based on the comparative book
       values of Dominguez Common Stock and Group Common Stock at December 31,
       1998). The terms of the Amended Merger Agreement would result in an
       expected increase in dividends to Dominguez shareholders following the
       Merger of between 45% and 73% (depending upon the exact Exchange Ratio
       based upon 1998 dividends paid by Dominguez and Group, and an expected
       increase in the book value per share for Dominguez shareholders of
       between 59% to 89% (depending upon the exact Exchange Ratio) based upon
       the comparable book values of Dominguez common stock and Group common
       stock at December 31, 1998.
 
     - The presentations of PaineWebber and the opinions of PaineWebber, as
       financial advisor to Dominguez, that as of the date of such opinions, the
       Exchange Ratio to be used in the Merger was fair to the holders of
       Dominguez Common Stock from a financial point of view. See "Opinions of
       Financial Advisor".
 
     - The effects of the proposed transaction on Dominguez Shareholders,
       employees, and customers, including the opportunity of Dominguez
       Shareholders to share in the anticipated benefits of ownership of Group
       Common Stock following the Effective Time of the Merger.
 
     - The belief of Dominguez senior management and of the Dominguez Board that
       Group and Dominguez have compatible corporate cultures and that Dominguez
       employees will have excellent career opportunities with Group, which has
       agreed to offer equivalent employment to all Dominguez employees
       following the Merger. See "Employee and Employee Benefit Matters."
 
     - The expectation that the Merger would be considered a tax-free
       "reorganization" under Section 368(a) of the Internal Revenue Code (the
       "Code") and that the Merger would be accounted for as a "pooling of
       interests" for accounting and financial reporting purposes. See "Material
       Federal Income Tax Consequences" and "Accounting Treatment."
 
     Additional factors considered by the Dominguez Board relating to the
benefits to its customers are described in the Joint Application for Approval of
the Merger, dated January 27, 1999, submitted by Group and Dominguez with the
California Public Utilities Commission (the "CPUC") seeking the CPUC's approval
of the Merger. This document is available for inspection at the CPUC's
headquarters located at 505 Van Ness Avenue, San Francisco, California 94102.
 
     The foregoing discussion of the information and factors considered by the
Dominguez Board is not intended to be exhaustive but is believed to include all
material factors considered by it. In reaching its determination to approve the
Merger, the Dominguez Board did not assign any relative or specific weights to
the foregoing factors, and individual directors may have given differing weights
to differing factors.
 
     BASED ON THE FOREGOING, THE DOMINGUEZ BOARD UNANIMOUSLY RECOMMENDS THAT
DOMINGUEZ SHAREHOLDERS VOTE "FOR" THE APPROVAL OF THE AMENDED MERGER AGREEMENT
AND THE TRANSACTIONS CONTEMPLATED THEREBY.
 
                                       24
<PAGE>   33
 
REASONS OF GROUP FOR THE MERGER
 
     The Group Board believes that the Merger is in the best interests of Group
and its shareholders for the following reasons:
 
     - The Merger can provide improved opportunities to realize significant
       benefits for the shareholders, customers and employees of both companies
       than could be realized if each company continued to operate
       independently.
 
     - There will be continued consolidation in the water industry. In the
       United States, there are currently over 50,000 separate water purveyors.
       About 85% of the water systems are publicly owned and only 15% are
       investor owned systems. Based on the large number of water systems, it is
       obvious that both public and private smaller systems would benefit from
       consolidation. The need for increased capital expenditures to comply with
       new water quality requirements and the replacement of aging
       infrastructure is beyond the resources of many systems with a limited
       number of customers.
 
     - Group shareholders will realize increased value since the transaction,
       excluding any one-time transaction expenses, is projected to be accretive
       to earnings in the first full calendar year of operations.
 
     - The Merger will provide Group with a larger presence in the South Bay
       area of the Los Angeles Basin. New service territories will also be
       gained in the Kern River Valley to the east of Group's existing
       Bakersfield district, in the Antelope Valley area of Southern California
       and in the Russian River area of Northern California. These new systems
       will expand Group's customer base by about 40,000 accounts. The increased
       presence in the South Bay will provide more future growth opportunities.
       New systems in other areas of California will expand growth opportunities
       into areas where Group currently does not have a presence.
 
     - Significant operational synergies are expected to be realized from the
       Merger, especially in the South Bay area of the Los Angeles Basin.
       Dominguez' existing 33,000 account system is adjacent to Group's
       Hermosa-Redondo district and close to Group's Palos Verdes and Hawthorne
       districts. Combined, the four operations will serve about 87,000
       customers.
 
     - Combining Group and Dominguez will allow the varied expertise of the two
       companies to be spread over a larger customer base. This will allow
       benefit to all customers through improved operational efficiencies.
 
     - Dominguez has a profitable and established water rights brokerage
       business. The merged company will work to maintain and expand this
       function which expands the non-regulated water related business.
 
     There can be no assurance, however, that any of the results, efficiencies
or opportunities described in this section will be achieved as a result of the
Merger. See "Forward Looking Statements" and "Risk Factors."
 
OPINIONS OF FINANCIAL ADVISOR
 
     Dominguez retained PaineWebber as its exclusive financial advisor in
connection with the Merger. In connection with such engagement, Dominguez
requested PaineWebber to render an opinion as to whether or not the initial
exchange ratio of 1.18 and subsequently the Exchange Ratio, is fair, from a
financial point of view, to the shareholders of Dominguez. PaineWebber was not
requested to, and did not determine the initial exchange ratio or the Exchange
Ratio to be provided in the Merger, which were determined through arms-length
negotiations between Dominguez and Group.
 
     In connection with the Dominguez Board's consideration of the Merger,
PaineWebber delivered its opinion (the "November 13, 1998 PaineWebber Opinion")
to the effect that, as of November 13, 1998, and based on its review and
assumptions and subject to the limitations summarized below, the exchange ratio
of 1.18 is fair, from a financial point of view, to the Dominguez shareholders.
At that time, the Original Merger Agreement provided for a fixed exchange ratio
of 1.18 shares of Group Common Stock to be exchanged for each outstanding share
of Dominguez Common Stock. Subsequent to delivery of the November 13, 1998
PaineWebber Opinion, Dominguez and Group amended the Original Merger Agreement
to replace this fixed
 
                                       25
<PAGE>   34
 
exchange ratio with the Exchange Ratio. At the March 22, 1999 meeting of the
Dominguez Board, PaineWebber performed analyses which incorporated the Exchange
Ratio in order to determine the subsequent potential pro forma effect of the
Merger on Group's earnings per share for the fiscal years ending December 31,
2000 through 2003. A summary of this analysis is listed under "Additional Pro
Forma Merger Analysis." As of the date of this Proxy Statement-Prospectus,
PaineWebber performed certain procedures to update certain of its analyses and
reviewed the assumptions on which such analyses were based and the factors
considered in connection therewith and delivered its opinion (the "April   ,
1999 PaineWebber Opinion") to the effect that, as of April   , 1999 and based on
its review and assumptions and subject to the limitations summarized below, the
revised Exchange Ratio is fair, from a financial point of view, to the Dominguez
shareholders. The summary analyses below, with the exception of the "Additional
Pro Forma Merger Analysis," reference the November 13, 1998 PaineWebber Opinion.
 
     The PaineWebber Opinion was prepared at the request and for the information
of the Dominguez Board and does not constitute a recommendation to any
shareholder of Dominguez as to how any such shareholder should vote with respect
to the Merger. The PaineWebber Opinion does not address the relative merits of
the Merger and any other transactions or business strategies discussed by the
Dominguez Board as alternatives to the Merger or the decision of the Dominguez
Board to proceed with the Merger. PaineWebber was not requested or authorized to
solicit, and did not solicit, potential purchasers of Dominguez. Dominguez did
not place any limitations upon PaineWebber with respect to the procedures
followed or factors considered in rendering the PaineWebber Opinion.
 
     In arriving at its opinion, PaineWebber, among other things: (i) reviewed,
among other public information, Dominguez' Annual Reports, Forms 10-K and
related financial information for the four fiscal years ended December 31, 1997
and Dominguez' Form 10-Q and the related unaudited financial information for the
nine months ended September 30, 1998; (ii) reviewed, among other public
information, Group's Annual Reports, Forms 10-K and related financial
information for the four fiscal years ended December 31, 1997 and Group's Form
10-Q and the related unaudited financial information for the nine months ended
September 30, 1998; (iii) reviewed certain information, including financial
forecasts, relating to the business, earnings, cash flows, assets and prospects
of Dominguez and Group, furnished to PaineWebber by Dominguez and Group,
respectively; (iv) conducted discussions with members of senior management of
Dominguez and Group concerning their respective businesses and prospects; (v)
compared the historical market prices and trading activity for Dominguez Common
Stock and Group Common Stock with those of certain publicly traded companies
which PaineWebber deemed to be relevant; (vi) compared the financial position
and results of operations of Dominguez and Group with those of certain publicly
traded companies which PaineWebber deemed to be relevant; (vii) compared the
financial terms of the Merger with the financial terms of certain other mergers
and acquisitions which PaineWebber deemed to be relevant; (viii) considered the
potential pro forma effects of the Merger on Group; (ix) reviewed a draft of the
Merger Agreement in the form presented to Dominguez' Board of Directors; and (x)
reviewed such other financial studies and analyses and performed such other
investigations and took into account such other matters as PaineWebber deemed
necessary including PaineWebber's assessment of regulatory, general economic,
market and monetary conditions.
 
     In preparing the PaineWebber Opinion, PaineWebber relied on the accuracy
and completeness of all information that was publicly available, supplied or
otherwise communicated to PaineWebber by or on behalf of Dominguez and Group,
and PaineWebber has not assumed any responsibility to independently verify such
information. PaineWebber has assumed, with Dominguez' consent, that the
financial forecasts examined by it were reasonably prepared on bases reflecting
the best currently available estimates and good faith judgments of the
managements of Dominguez and Group as to the future performance of Dominguez and
Group, respectively. PaineWebber has also relied upon assurances of the
managements of Dominguez and Group that they were unaware of any facts that
would make the information or financial forecasts provided to PaineWebber
incomplete or misleading. PaineWebber has also assumed, with Dominguez' consent,
that (i) the Merger will be accounted for under the pooling-of-interests method
of accounting; (ii) the Merger will be a tax-free reorganization; and (iii) any
material liabilities (contingent or otherwise, known or unknown) of Dominguez or
Group are as set forth in the consolidated financial statements of Dominguez and
Group, respectively. PaineWebber did not make an independent evaluation or
appraisal of the assets or liabilities
 
                                       26
<PAGE>   35
 
(contingent or otherwise) of Dominguez or Group, nor was PaineWebber furnished
with any such evaluations or appraisals. The PaineWebber Opinion is based upon
regulatory, general economic, market and monetary conditions existing on the
date thereof. Furthermore, PaineWebber expressed no opinion as to the price at
which Group Common Stock may trade at any time subsequent to the Merger.
 
     The preparation of a fairness opinion involves various determinations as to
the most appropriate and relevant quantitative methods of financial analyses and
the application of those methods to the particular circumstances and, therefore,
such an opinion is not readily susceptible to partial analysis or summary
description. Accordingly, PaineWebber believes that its analysis must be
considered as a whole and that considering any portion of such analysis and of
the factors considered, without considering all analyses and factors, could
create a misleading or incomplete view of the process underlying the PaineWebber
Opinion. In its analyses, PaineWebber made numerous assumptions with respect to
industry performance, general business and economic conditions and other
matters, many of which are beyond the control of Dominguez and Group. Any
estimates contained in these analyses are not necessarily indicative of actual
values or predictive of future results or values, which may be significantly
more or less favorable than as set forth therein. In addition, analyses relating
to the value of businesses do not purport to be appraisals or to reflect the
prices at which businesses may be sold. Accordingly, such analyses and estimates
are inherently subject to substantial uncertainty and neither Dominguez nor
PaineWebber assumes responsibility for the accuracy of such analyses and
estimates.
 
     The following paragraphs summarize the significant analyses performed by
PaineWebber in arriving at the PaineWebber Opinion.
 
     Stock Trading History: PaineWebber reviewed the history of the trading
prices and volume for the Dominguez Common Stock and the Group Common Stock,
both separately and in relation to market and comparable company indices. The
market index represented the Standard & Poor's 40 Utilities Index. The
comparable company indices represented (i) an index of eight water utility
companies: American States Water Company, Aquarion Company, Connecticut Water
Service, Inc., E'town Corporation, Middlesex Water Company, SJW Corp., Southwest
Water Company and United Water Resources Inc. (collectively, "Water Composite
I"); and (ii) an index of ten water utility companies including all the
companies in Water Composite I plus American Water Works Company, Inc. and
Philadelphia Suburban Corporation (collectively, the "Comparable Companies"). In
addition, PaineWebber reviewed the historical implied exchange ratio between
Dominguez Common Stock and Group Common Stock and compared this to the Exchange
Ratio. PaineWebber noted that the Exchange Ratio consistently fell above the
historical implied exchange ratio.
 
     Selected Comparable Public Company Analysis: Using publicly available
information, PaineWebber compared selected historical and projected financial,
operating and stock market performance data of Dominguez and Group to the
corresponding data of the Comparable Companies. PaineWebber noted there are no
directly comparable companies to Dominguez and Group.
 
     With respect to Dominguez and the Comparable Companies, PaineWebber
compared multiples of total enterprise value (market value, as hereinafter
defined, plus preferred stock and debt less cash and cash equivalents) to latest
twelve month ("LTM") earnings before interest, taxes and depreciation and
amortization ("EBITDA"). PaineWebber also compared multiples of market value
(share price multiplied by shares outstanding including in-the-money options and
warrants) to LTM net income, book value of equity, estimated 1998 and 1999 net
income (as estimated by First Call or I/B/E/S research earnings estimates) and
compared indicated dividend yield. Dominguez' LTM ended June 30, 1998 multiples
of LTM EBITDA, LTM net income, book value of equity, estimated 1998 and 1999 net
income and Dominguez' indicated dividend yield as of November 9, 1998 were 8.8x,
18.9x, 2.2x, 16.8x, 16.8x and 4.0%, respectively. As of November 9, 1998 the
Comparable Companies' median multiples of LTM EBITDA, LTM net income, book value
of equity, estimated 1998 and 1999 net income and the Comparable Companies'
median indicated dividend yield were 10.3x, 17.7x, 1.9x, 17.4x, 16.5x and 4.6%,
respectively. PaineWebber applied the Comparable Companies' median multiples to
Dominguez' LTM EBITDA, LTM net income, book value of equity, estimated 1998 and
1999 net income (as estimated by Dominguez management) and applied the
 
                                       27
<PAGE>   36
 
Comparable Companies' median indicated dividend yield to Dominguez' indicated
dividend and derived a range of fully diluted equity values of $21.00 to $25.00
per share. Based on Group's closing stock price of $26.875 on November 11, 1998,
this implied an exchange ratio of 0.78x to 0.93x. PaineWebber noted that the
Exchange Ratio fell above this range.
 
     With respect to Group and the Comparable Companies, PaineWebber compared
multiples of total enterprise value to LTM EBITDA. PaineWebber also compared
multiples of market value to LTM net income, book value of equity, estimated
1998 and 1999 net income (as estimated by First Call or I/B/E/S research
earnings estimates) and compared indicated dividend yield. Group's LTM ended
June 30, 1998 multiples of LTM EBITDA, LTM net income, book value of equity,
estimated 1998 and 1999 net income and Group's indicated dividend yield as of
November 9, 1998 were 9.7x, 20.3x, 2.1x, 18.3x, 17.6x and 4.0%, respectively. As
of November 9, 1998 the Comparable Companies' median multiples of LTM EBITDA,
LTM net income, book value of equity, estimated 1998 and 1999 net income and
median indicated dividend yield were 10.3x, 17.7x, 1.9x, 17.4x, 16.5x, and 4.6%,
respectively. PaineWebber applied the Comparable Companies' median multiples to
Group's LTM EBITDA, LTM net income, book value of equity, estimated 1998 and
1999 net income (both as estimated by Group management) and applied the
Comparable Companies' median indicated dividend yield to Group's indicated
dividend and that derived a range of fully diluted equity values of $23.00 to
$27.00 per share. The Group Common Stock closing price of $26.875 on November
11, 1998, fell within this range.
 
     Selected Comparable Mergers and Acquisitions Analysis: PaineWebber reviewed
publicly available financial information for selected mergers and acquisitions
involving target companies in the water utility and gas distribution utility
businesses. The selected mergers and acquisitions PaineWebber analyzed included
(acquiror/target): American Water Works Company, Inc./National Enterprises Inc.,
Philadelphia Suburban Corporation/Consumers Water Company, Eastern
Enterprises/Essex County Gas Company, NIPSCO Industries/IWC Resources, TECO
Energy, Inc./Lykes Energy Inc., Atmos Energy Corporation/United Cities Gas
Company, American Water Works Company, Inc./Pennsylvania Gas and Water Company,
United Water Resources Inc./GWC Corporation (collectively, the "Comparable
Transactions"). PaineWebber noted that there are no directly comparable
transactions to the Merger.
 
     PaineWebber reviewed the consideration paid (for stock deals, based on the
acquirer's stock price on the day prior to the announcement of the transaction)
in the Comparable Transactions and compared multiples of total enterprise value
to the target's LTM (latest twelve months prior to the announcement of the
transaction) EBITDA and earnings before interest and taxes ("EBIT"). PaineWebber
also reviewed multiples of market value to the target's LTM net income, book
value of equity and LTM cash flow from operations (net income plus depreciation
and amortization) ("CFFO"). PaineWebber calculated the Comparable Transactions'
multiples of LTM EBITDA, LTM EBIT, LTM net income, book value of equity and LTM
CFFO to be 9.0x, 13.3x, 22.1x, 2.4x and 10.2x, respectively. PaineWebber applied
the Comparable Transactions' median multiples to Dominguez' LTM EBITDA, LTM
EBIT, LTM net income, book value of equity and LTM CFFO and derived a range of
fully diluted equity values of $23.00 to $27.00 per share. Based on Group's
closing stock price of $26.875 on November 11, 1998, this implied an exchange
ratio range of 0.86x to 1.00x. PaineWebber noted that the Exchange Ratio fell
above this range.
 
     Contribution Analysis: PaineWebber noted that based on the Exchange Ratio,
holders of Dominguez Common Stock will own approximately 12.5% of the combined
company's equity, on a fully-diluted basis. PaineWebber analyzed Dominguez' and
Group's relative contribution to the combined entity with respect to LTM
revenue, EBITDA, EBIT and net income. Dominguez would have contributed to the
combined entity's LTM revenue, LTM EBITDA, LTM EBIT and net income 12.6%, 9.4%,
9.3% and 10.1%, respectively. PaineWebber also analyzed the relative
contribution of Dominguez' and Group's net utility plant, total assets and
regulated customers as of June 30, 1998. Dominguez would have contributed to the
combined entity's net utility plant, total assets and regulated customers, 7.7%,
8.8% and 9.0%, respectively. The results of this contribution analysis are not
necessarily indicative of the contributions that the respective businesses may
have in the future.
 
                                       28
<PAGE>   37
 
     Discounted Cash Flow Analysis: PaineWebber analyzed Dominguez based on an
unleveraged discounted cash flow analysis of the projected financial performance
of Dominguez. Such projected financial performance was based upon a five-year
forecast for Dominguez provided by Dominguez management. The discounted cash
flow analysis determined the discounted present value of the unleveraged
after-tax cash flows generated over the five-year period and then added a
terminal value based upon a range of EBITDA multiples from 8.0x to 9.5x. The
unleveraged after-tax cash flows and terminal value were discounted using a
range of discount rates from 9.0% to 10.5%. Based on this analysis, PaineWebber
derived fully diluted equity values of $22.00 to $25.00 per share for Dominguez.
Based on Group Common Stock closing price of $26.875 on November 11, 1998, this
implied an exchange ratio range of 0.82x to 0.93x. PaineWebber noted that the
Exchange Ratio fell above this range.
 
     PaineWebber analyzed Group based on an unleveraged discounted cash flow
analysis of the projected financial performance of Group. Such projected
financial performance was based upon a five-year forecast for Group provided by
Group management. The discounted cash flow analysis determined the discounted
present value of the unleveraged after-tax cash flows generated over the
five-year period and then added a terminal value based upon a range of EBITDA
multiples from 8.5x to 10.0x. The unleveraged after-tax cash flows and terminal
value were discounted using a range of discount rates from 9.0% to 10.5%. Based
on this analysis, PaineWebber derived fully diluted equity values of $25.00 to
$28.00 per share. PaineWebber noted that the Group Common Stock closing price of
$26.875 on November 11, 1998, fell within this range.
 
     Premiums Paid Analysis: PaineWebber analyzed purchase price per share
premiums paid in selected publicly-disclosed transactions in all industries with
transaction values between $30 million and $100 million announced since January
1, 1996. This analysis indicated mean premiums to the target's closing stock
price one day, one week and four weeks prior to the announcement of the
transaction of 22.6%, 29.0% and 36.5%, respectively. This analysis also
indicated median premiums to the target's closing stock price one day, one week
and four weeks prior to the announcement of the transaction of 18.1%, 23.5% and
31.7%, respectively. Based on Dominguez' closing stock prices one day, one week
and four weeks prior to its closing stock price on November 11, 1998, applying
the mean and median premiums to the appropriate Dominguez Common Stock closing
prices yielded fully diluted equity values of $28.00 to $30.00 per share. Based
on Dominguez' Common Stock closing price of $26.875 on November 11, 1998, this
implied an exchange ratio range of 1.04x to 1.12x. PaineWebber noted that the
Exchange Ratio fell above this range.
 
     Pro Forma Merger Analysis: PaineWebber performed an analysis of the
potential pro forma effect of the Merger on Group's earnings per share
("EPS")for the fiscal years ending December 31, 2000 through 2003. In performing
this analysis, PaineWebber assumed (i) the Exchange Ratio; (ii) the Merger would
be accounted for under the pooling-of-interests method of accounting; and (iii)
certain estimated annual cost savings due to the Merger as estimated by the
managements of Dominguez and Group. PaineWebber combined the projected operating
results of Dominguez (provided by Dominguez management) with the corresponding
projected operating results of Group (provided by Group management) to arrive at
the combined company projected pro forma net income. PaineWebber divided the
combined company projected pro forma net income by the pro forma shares
outstanding to arrive at the combined company projected pro forma EPS.
PaineWebber then compared the combined company projected pro forma EPS to
Group's projected stand-alone EPS (provided by Group management) to determine
the projected pro forma impact on Group's EPS. This analysis suggested that the
Merger should result in accretion to Group's EPS for the fiscal years ended
December 31, 2000 through 2003.
 
     Additional Pro Forma Merger Analysis: On March 22, 1999, PaineWebber
performed an analysis of the potential pro forma effect of the Merger on Group's
EPS for the fiscal years ending December 31, 2000 through 2003. In performing
this analysis, PaineWebber assumed (i) the Exchange Ratio; (ii) the Merger would
be accounted for under the pooling-of-interests method of accounting; and (iii)
certain estimated annual cost savings due to the Merger as estimated by the
managements of Dominguez and Group. PaineWebber combined the projected operating
results of Dominguez (provided by Dominguez management) with the corresponding
projected operating results of Group (provided by Group management) to arrive at
the combined company projected pro forma net income. PaineWebber divided the
combined company projected pro forma net income by the pro forma shares
outstanding to arrive at the combined company projected pro
 
                                       29
<PAGE>   38
 
forma EPS. PaineWebber then compared the combined company projected pro forma
EPS to Group's projected stand-alone EPS (provided by Group management) to
determine the projected pro forma impact on Group's EPS. This analysis suggested
that the Merger should result in accretion to Group's EPS for the fiscal years
ended December 31, 2000 through 2003.
 
     Dominguez selected PaineWebber to be its financial advisor in connection
with the Merger because PaineWebber is a prominent investment banking and
financial advisory firm with experience in the valuation of businesses and their
securities in connection with mergers and acquisitions, negotiated
underwritings, secondary distributions of securities, private placements and
valuations for corporate purposes, with experience in utility mergers and
acquisitions.
 
     Pursuant to an engagement letter between Dominguez and PaineWebber dated
August 10, 1998, PaineWebber has earned and been paid a retention fee of $50,000
and a fee of $400,000 for rendering of the PaineWebber Opinion. In addition,
PaineWebber will receive a fee, payable upon completion of the Merger, equal to
approximately $350,000 and will be reimbursed for certain of its related
expenses. PaineWebber will not be entitled to any additional fees or
compensation in the event the Merger is not approved or otherwise consummated.
Dominguez also agreed, under separate agreement, to indemnify PaineWebber, its
affiliates and each of its directors, officers, agents and employees and each
person, if any, controlling PaineWebber or any of its affiliates against certain
liabilities, including liabilities under federal securities laws.
 
     In the past, PaineWebber and its affiliates have provided investment
banking services to Dominguez and have received fees for the rendering of these
services. In addition, a representative of PaineWebber is a member of the
Dominguez Board. This representative has had no involvement in the Merger on
behalf of PaineWebber. PaineWebber may provide financial advisory services to,
and may act as underwriter or placement agent for, the combined company in the
future. In the ordinary course of PaineWebber's business, PaineWebber may
actively trade the securities of Dominguez and Group for its own account and for
the accounts of its customers and, accordingly, may at any time hold long or
short positions in such securities.
 
     THE FULL TEXTS OF THE APRIL   , 1999 PAINEWEBBER OPINION AND THE NOVEMBER
13, 1998 PAINEWEBBER OPINION WHICH SET FORTH THE PROCEDURES FOLLOWED,
ASSUMPTIONS MADE, MATTERS CONSIDERED AND LIMITATIONS ON THE REVIEW UNDERTAKEN,
ARE ATTACHED AS APPENDIX "B" AND APPENDIX "C" TO THIS PROXY STATEMENT-PROSPECTUS
AND ARE INCORPORATED HEREIN BY REFERENCE. DOMINGUEZ SHAREHOLDERS ARE URGED TO
READ THESE OPINIONS CAREFULLY IN THEIR ENTIRETY. THE OPINIONS ARE ADDRESSED TO
THE DOMINGUEZ BOARD AND RELATE ONLY TO THE FAIRNESS OF THE ORIGINAL EXCHANGE
RATIO AND THE REVISED EXCHANGE RATIO FROM A FINANCIAL POINT OF VIEW, DO NOT
ADDRESS ANY OTHER ASPECT OF THE PROPOSED MERGER OR ANY RELATED TRANSACTION AND
DO NOT CONSTITUTE A RECOMMENDATION TO ANY SHAREHOLDER AS TO HOW SUCH SHAREHOLDER
SHOULD VOTE AT THE DOMINGUEZ SPECIAL MEETING. THE SUMMARIES OF THE APRIL   ,
1999 PAINEWEBBER OPINION AND THE NOVEMBER 13, 1998 PAINEWEBBER OPINION SET FORTH
IN THIS PROXY STATEMENT-PROSPECTUS ARE QUALIFIED IN THEIR ENTIRETY BY REFERENCE
TO THE FULL TEXT OF SUCH OPINIONS.
 
INTERESTS OF CERTAIN PERSONS IN THE MERGER
 
     General. In connection with their approval of the Original Merger Agreement
and the Amended Merger Agreement and the transactions contemplated thereby, the
Dominguez Board and the Group Board considered the proposed post-Merger
participation by certain members of Dominguez management and of the Dominguez
Board in the operations of Group.
 
     Senior Management. Group has offered Brian J. Brady, President and Chief
Executive Officer of Dominguez, and John S. Tootle, Vice President, Secretary
and Chief Financial Officer of Dominguez, positions with Group following the
Merger. Group has offered Mr. Brady the position of Vice President, Regulated
Acquisitions. His principal responsibilities would be with respect to regulatory
acquisitions and mergers for Group. Group has offered Mr. Tootle employment with
Group in a capacity and with responsibilities and duties in legal and regulatory
matters involving the CPUC and financial matters. The term of employment for
both Mr. Brady and Mr. Tootle would be for three years, subject to earlier
termination by either Group or Mr. Brady or Mr. Tootle, as the case may be, with
or without cause. Except in the event that employment is terminated by Group for
cause, if employment were terminated prior to the expiration of the employment
term, Mr. Brady or Mr. Tootle, as the case may be, would be entitled to receive
a payment equal
 
                                       30
<PAGE>   39
 
to the lesser of the remaining balance of base salary he would be entitled to
receive for the remainder of the term of his employment, or two years' base
salary from Group in exchange for his agreement not to solicit Group employees
or compete with Group. Mr. Brady and Mr. Tootle would each be entitled to a base
salary from Group calculated with reference to their respective salaries with
Dominguez at the Effective Time and the average of certain past bonuses. In
1998, Mr. Brady received a salary of $156,613 and a bonus of $26,402 (for
services rendered during 1997), and Mr. Tootle received a salary of $113,475 and
a bonus of $15,295 (for services rendered during 1997). Mr. Brady and Mr. Tootle
each would be entitled to the same package of benefits available to other
executives of Group at their same levels.
 
     Option Holders. The Amended Merger Agreement contemplates that immediately
prior to the Merger, Dominguez will accelerate the exercise rights of all then
outstanding options to purchase Dominguez Common Stock so that the holders of
these options may exercise them immediately prior to the Merger.
 
     Group Board. The Amended Merger Agreement provides that immediately prior
to the Effective Time, Group will select one member of the Dominguez Board to
serve on the Group Board. See "Board of Directors, Management and Operations
after the Merger."
 
     Directors and Officers Insurance. The Amended Merger Agreement provides
that, prior to the Effective Time, Dominguez will obtain a policy of insurance
("D&O Insurance") that will be effective for up to a four year period following
the Effective Time insuring its directors and officers and those of the
Dominguez Subsidiaries, and those persons who become directors and officers of
Dominguez or Dominguez Subsidiaries between the date of the Amended Merger
Agreement and the Effective Time. This insurance shall be no less protective in
terms of policy limits, coverage or limitations than the insurance for officers
and directors maintained by Dominguez at the date of the Amended Merger
Agreement. Dominguez' current D&O Insurance insures those persons covered by it
for an aggregate coverage of $22 million, consisting of $3 million of primary
coverage and $19 million of excess "umbrella" coverage. The new D&O Insurance to
be obtained by Dominguez (the "New Policy") will provide for coverage that will
cover acts and omissions occurring prior to the Effective Time and acts and
omission relating to the Amended Merger Agreement and the actions contemplated
thereby to the extent such insurance is commercially available. The Amended
Merger Agreement further provides, however, that Dominguez may not obtain or pay
for any coverage under the New Policy that requires an annual premium that
exceeds 150% of the annual premium that Dominguez pays for its D&O Insurance at
the date of the Amended Merger Agreement, plus any general increases in the cost
of D&O Insurance between the date of the Amended Merger Agreement and the
periods covered by the New Policy.
 
THE EFFECTIVE TIME
 
     Subject to the satisfaction or waiver of certain conditions contained in
the Amended Merger Agreement, the parties will cause the Effective Time to occur
on the fifth business day after the last to occur of (i) the approval of the
Amended Merger Agreement and the transactions contemplated thereby by the
Dominguez Shareholders, (ii) the receipt of all permits, authorizations,
approvals and consents required by law and the Amended Merger Agreement, (iii)
the expiration of all applicable waiting periods under the law, and (iv) the
expiration of the 30 day period following the mailing by Dominguez to its
shareholders of a Notice of Approval of the Merger by the outstanding shares
pursuant to Section 1301 of the CGCL; provided, however, that the Effective Time
shall not be later than November 13, 1999 and any permitted extension thereto
under the Amended Merger Agreement, unless otherwise agreed to by a majority of
the respective Boards of Directors of Dominguez and Group.
 
     At the Effective Time, the Dominguez Shareholders will cease to be
Dominguez Shareholders, and will have no rights as Dominguez Shareholders, other
than the right to receive (i) the number of shares of Group Common Stock and
cash in lieu of fractional shares, if any, to which they may be entitled
pursuant to the Exchange Ratio; and (ii) any dividend or other distribution with
respect to Dominguez Common Stock, with a record date occurring prior to the
Effective Time. After the Effective Time, there will be no transfers on the
stock transfer books of Dominguez or of shares of Dominguez Common Stock.
 
                                       31
<PAGE>   40
 
EXCHANGE OF CERTIFICATES
 
     At or prior to the Effective Time, Group will deposit, or will cause to be
deposited, with Boston EquiServe, (the "Exchange Agent"), certificates
representing the shares of Group Common Stock ("Group Certificates"), and an
estimated amount of cash to be paid in lieu of fractional shares, to which a
holder of record of certificates for shares formerly representing Dominguez
Common Stock ("Dominguez Certificates") would otherwise be entitled based on the
Exchange Ratio.
 
     As soon as practicable after the Effective Time, the Exchange Agent will
mail to each holder of record of Dominguez Common Stock shares at the Effective
Time transmittal materials for use in exchanging the Dominguez Certificates for
the Group Certificates. At the Effective Time, each Dominguez Shareholder's
shares of Dominguez Common Stock will be converted into the right to receive (i)
Group Certificates into which Dominguez Shareholder's shares of Dominguez Common
Stock are converted pursuant to the Exchange Ratio, and (ii) a check in respect
of any fractional share interests or dividends or distributions. The Group
Certificates and any check will be delivered to the Dominguez Shareholder upon
delivery to the Exchange Agent of his/her Dominguez Certificates (or indemnity
reasonably satisfactory to Group and the Exchange Agent if any of such Dominguez
Certificates have been lost, stolen or destroyed). No interest will be paid on
any cash to be paid upon such delivery.
 
     DOMINGUEZ SHAREHOLDERS SHOULD NOT SEND IN THEIR CERTIFICATES UNTIL THEY
RECEIVE THE TRANSMITTAL MATERIALS AND INSTRUCTIONS FROM THE EXCHANGE AGENT.
 
     No fractional shares of Group Common Stock and no certificates or scrip
therefor, or other evidence of ownership thereof, will be issued in the Merger;
instead, Group will pay to each Dominguez Shareholder who would otherwise be
entitled to a fractional share of Group Common Stock (after taking into account
all Dominguez shares owned by such shareholder) an amount in cash to be paid in
lieu of fractional shares (without interest) determined by multiplying the
fraction of the share of Group Common Stock to which such holder would otherwise
be entitled by the average of the daily closing price of a share of Group Common
Stock reported on the NYSE during the 20 consecutive trading days ending at the
end of the third trading day immediately preceding the Effective Time
(calculated to the nearest hundredth).
 
     Notwithstanding the foregoing, neither the Exchange Agent nor any party to
the Amended Merger Agreement will be liable to any holder of Dominguez Common
Stock (or, if after the Effective Time, former Dominguez Shareholder) for any
amount delivered in good faith to a public official pursuant to applicable
abandoned property, escheat or similar laws.
 
     No dividends or other distributions with respect to Group Common Stock with
a record date occurring after the Effective Time will be paid to the holder of
any unsurrendered Dominguez Certificate, and such holder will not have voting
rights with respect to such Group Common Stock, until the holder surrenders such
Certificate in accordance with the terms of the Amended Merger Agreement. After
the proper surrender of a Dominguez Certificate and subject to the effect of
applicable laws, the record holder thereof will be entitled to receive any such
dividends or other distributions, without any interest thereon, which had
previously become payable with respect to shares of Group Common Stock.
 
REPRESENTATIONS AND WARRANTIES
 
     The Amended Merger Agreement contains customary representations and
warranties by each of Group and Dominguez relating to, among other things, (a)
their respective organization, the organization of their respective subsidiaries
and similar corporate matters; (b) their respective capital structure; (c)
authorization, execution, delivery, performance and enforceability of the
Amended Merger Agreement and related matters; (d) regulatory approvals; (e)
compliance with applicable laws and agreements; (f) reports and financial
statements filed with the Securities and Exchange Commission (the "SEC") and the
accuracy of information contained therein; (g) absence of material adverse
changes and undisclosed liabilities; (h) litigation; (i) the accuracy of
information supplied by each of Group and Dominguez for use in the Registration
Statement, of which this Proxy Statement-Prospectus forms a part, that Group has
filed in connection with the issuance and
 
                                       32
<PAGE>   41
 
registration of Group Common Stock to be issued in the Merger; (j) tax matters;
(k) retirement and other employee benefit plans and matters relating to the
Employee Retirement Income Security Act of 1974, as amended; (l) labor issues;
and (m) environmental matters. The representations and warranties of each of the
parties to the Amended Merger Agreement will expire immediately after the
Effective Time.
 
CONDUCT OF BUSINESS PRIOR TO THE MERGER AND OTHER COVENANTS
 
     Limitation on Dominguez' Conduct Prior to Effective Time of the Merger. The
Amended Merger Agreement provides that between the date of the Amended Merger
Agreement and the Effective Time, except as permitted by the Amended Merger
Agreement and subject to requirements of laws and regulations generally
applicable to California corporations, or unless Group shall otherwise provide
its written consent, Dominguez and each wholly-owned subsidiary of Dominguez
(the "Dominguez Subsidiaries") will conduct its business in the ordinary course
in substantially the manner previously conducted and in accordance with sound
business practices and without the prior written consent of Group, it will not,
among other things:
 
          (a) issue capital stock, rights, warrants, options or convertible or
     similar securities or issue long term debt, other than pursuant to the
     exercise of certain stock options outstanding as of the date of the Amended
     Merger Agreement (the "Dominguez Options") or in connection with certain
     pending and future acquisitions of small water companies consummated prior
     to the Effective Time;
 
          (b) declare or pay any dividends on or make other distributions in
     respect of or split, combine or reclassify any of its capital stock other
     than the payment of its regular quarterly cash dividend to its shareholders
     in amounts consistent with past practice;
 
          (c) affect certain other changes in its capitalization;
 
          (d) purchase, redeem or otherwise acquire any of its capital stock or
     other securities or any rights, options, or securities to acquire such
     capital stock or other securities;
 
          (e) grant any general or uniform increase in the rate of pay of
     employees or employee benefits except in the ordinary course of business
     consistent with past practice or enter into any new employment agreement or
     adopt any employee benefit plan or amend or modify any existing employment
     agreement or employee benefit plan or arrangement, except for those
     amendments that are required by law;
 
          (f) grant any increase in salary, incentive compensation or employee
     benefits or pay any bonus or voluntarily accelerate the vesting of any
     employee benefits (other than the acceleration and vesting of Dominguez
     Options outstanding on the date of the Amended Merger Agreement), except
     for annual salary increases of not more than 3.5% in the aggregate which
     may not be in the form of stock options and shall only be granted in the
     ordinary course of business consistent with past practice or as required by
     an existing written employment agreement or pursuant to the 1996 Dominguez
     bonus plan, as amended;
 
          (g) make any capital expenditure or commitments with respect thereto
     that exceed $50,000 in the aggregate, except for (i) ordinary repairs,
     renewals and replacements, (ii) any agreement or commitment under any
     Dominguez approved planned capital budget program, and (iii) developer
     funded projects in accordance with applicable CPUC Rules;
 
          (h) change its tax or accounting policies and procedures or any method
     or period of accounting unless required by generally accepted accounting
     principles or a Governmental Entity;
 
          (i) invest funds in any entity other than by way of certain short term
     obligations of the United States Treasury, or investment grade municipal
     bonds, in the ordinary course of business consistent with past practice;
 
          (j) amend or modify any material contract or enter into any material
     contract other than (i) amendments or modifications entered into in the
     ordinary course of business consistent with past practice, (ii) any
     agreement or commitment under any Dominguez approved planned capital budget
     program, and (iii) developer funded projects in accordance with applicable
     CPUC Rules;
 
                                       33
<PAGE>   42
 
          (k) sell, transfer, mortgage, encumber, amend its indenture to
     encumber or otherwise dispose of any assets of Dominguez or the Dominguez
     Subsidiaries or release or waive any claim, except in the ordinary course
     of business and consistent with past practice;
 
          (l) knowingly take any action which would or is reasonably likely to
     (i) adversely affect the ability of Group or Dominguez to obtain any
     necessary approval of any Governmental Entity required for the transactions
     contemplated by the Amended Merger Agreement; (ii) adversely affect
     Dominguez' ability to perform its covenants and agreements under the
     Amended Merger Agreement; or (iii) result in any of the conditions to the
     performance of Group or Dominguez' obligations under the Amended Merger
     Agreement not being satisfied;
 
          (m) knowingly take or cause to be taken any action which would
     disqualify the Merger as a "reorganization" within the meaning of Section
     368(a) of the Code or prevent Group from accounting for the business
     combination to be effected by the Merger as a pooling-of-interests;
 
          (n) settle any claim, action or proceeding involving any material
     liability for monetary damages or enter into any settlement agreement
     containing material obligations;
 
          (o) incur any indebtedness for borrowed money, excluding extensions of
     existing bank lines of credit, or assume, guaranty, endorse or otherwise as
     an accommodation become responsible for the obligations of any other
     Person, except for short-term borrowings made at prevailing market rates
     and terms;
 
          (p) amend its Articles of Incorporation or Bylaws, except as may be
     required to effect the transactions contemplated by the Amended Merger
     Agreement;
 
          (q) compromise or otherwise settle or adjust any assertion or claim of
     a deficiency in taxes (or interest thereon or penalties in connection
     therewith), extend the statute of limitations with any tax authority or
     file any pleading in court in any tax litigation or any appeal from an
     asserted deficiency, or file or amend any federal, foreign, state or local
     tax return, or make any tax election;
 
          (r) close any offices at which business is conducted or open any new
     offices except for those opened in connection with any pending acquisition;
 
          (s) initiate, solicit or encourage any inquiries or the making of any
     proposal which constitutes, or may reasonably be expected to lead to, any
     competing transaction, as defined in the Amended Merger Agreement
     ("Competing Transaction"), or, subject to the Dominguez Board exercising
     its fiduciary duties and subject to certain exceptions, negotiate with any
     person in furtherance of such inquiries or to obtain a Competing
     Transaction, or agree to or endorse any Competing Transaction, or authorize
     or permit any of its officers, directors or employees or any investment
     banker, financial advisor, attorney, accountant or any other representative
     retained by it or any of its affiliates to take any such action (see "No
     Solicitation of Transactions" for more information);
 
          (t) change any of its basic policies and practices with respect to
     operations, cash flow planning, marketing, budgeting, profit and tax
     planning, personnel practices or any other material aspect of its business
     or operations, except such changes as may be required by any Governmental
     Entity;
 
          (u) grant any person a power of attorney or similar authority;
 
          (v) reverse, other than in accordance with generally accepted
     accounting principles, any reserves for contingent tax liabilities for
     income tax on services;
 
          (w) sell any security other than in the ordinary course of business,
     or engage in gains trading; or
 
          (x) agree or commit to take any of the prohibited actions described
     above.
 
                                       34
<PAGE>   43
 
     Affirmative Conduct of Dominguez and Dominguez Subsidiaries Prior to
Effective Time of the Merger. The Amended Merger Agreement provides that between
the date of the Amended Merger Agreement and the Effective Time, Dominguez
shall, and shall cause each of the Dominguez Subsidiaries, among other things,
to:
 
          (a) use commercially reasonable efforts to maintain and preserve
     intact its present business organization and to maintain and preserve its
     relationships and goodwill with customers, employees and others having
     business relationships with Dominguez or any of the Dominguez Subsidiaries;
 
          (b) use its commercially reasonable efforts to keep in full force and
     effect all of the existing material permits and licenses of Dominguez and
     each of the Dominguez Subsidiaries;
 
          (c) use its commercially reasonable efforts to maintain insurance
     coverage at least equal to that now in effect on all properties for which
     it is responsible and on its business operations;
 
          (d) perform its material contractual obligations and not become in
     material default on any such obligations;
 
          (e) duly observe and conform in all material respects to all lawful
     requirements applicable to the business of Dominguez or any of the
     Dominguez Subsidiaries;
 
          (f) maintain its assets and properties in good condition and repair,
     normal wear and tear excepted;
 
          (g) promptly advise Group if any Person or Related Group of Persons
     acquires, directly or indirectly, record or beneficial ownership or control
     of 5% or more of the outstanding Dominguez Common Stock prior to the
     Effective Time;
 
          (h) promptly notify Group regarding any notification of potential
     adjustments to the tax liabilities of Dominguez arising from actions or
     threatened actions of any taxing authority, or any actual or threatened
     collection enforcement activity by any tax authority with respect to its
     tax liabilities;
 
          (i) make available to Group Dominguez SEC filings at the time of
     filing, press releases at the time of release, and monthly unaudited
     balance sheets and income statements of Dominguez within 25 days after the
     close of each calendar month;
 
          (j) use its commercially reasonable efforts to obtain any required
     third party consent to the Merger with respect to any material contract,
     agreement, lease, license, arrangement, release or permit of Dominguez or
     the Dominguez Subsidiaries that is contemplated by the Agreement as being
     required in connection with the Merger;
 
          (k) furnish to Group in a timely manner a copy of any communication
     submitted to the Dominguez Board or any committee thereof, including notice
     of the relevant terms of any Competing Transaction presented to Dominguez,
     subject to exceptions relating to communications regarding Dominguez'
     rights and obligations under the Amended Merger Agreement or the
     transactions contemplated thereby, including any Competing Transaction, or
     books, records and documents covered by confidentiality agreements or the
     attorney-client privilege, or which are attorneys' work product;
 
          (l) provide Group and its representatives continuing access to the
     books and records and other information relevant to the operations of
     Dominguez and the Dominguez Subsidiaries;
 
          (m) cause to be accurate all its filings with any Governmental Entity
     and make available to Group copies of all such filings;
 
          (n) promptly notify Group of any event of which Dominguez obtains
     knowledge which has or may have a materially adverse affect on Dominguez or
     of the determination by Dominguez that it is unable to meet any of the
     conditions set forth in the Amended Merger Agreement that are conditions
     precedent to the performance of Group and Cal Water's obligations
     thereunder;
 
          (o) promptly deliver copies of all communications and reports sent to
     Dominguez Shareholders, all reports that Dominguez files with the SEC and
     copies of all reports submitted to the Dominguez Board, subject to
     exceptions to reports relating to the Amended Merger Agreement, the
     transactions contem-
 
                                       35
<PAGE>   44
 
     plated thereby, any Competing Transaction, attorney-client privileged
     matters or which are attorneys' work product and, subject to certain
     exceptions, copies of all minutes of the Dominguez Board and any committee
     thereof;
 
          (p) prepare and file all applications and documents required to be
     filed by Dominguez or any Dominguez Subsidiary in connection with the
     Merger and provide to Group all information regarding Dominguez and the
     Dominguez Subsidiaries required by Group in connection with any
     applications to be filed by Group in connection with the Merger or the
     transactions contemplated thereby; and
 
          (q) obtain a letter from all affiliates and 5% shareholders of
     Dominguez pursuant to which they agree to certain restrictions relating to
     the sale of shares of Dominguez Common Stock owned by them and shares of
     Group Common Stock to be received in connection with the Merger. See
     "Restriction on Resale by Affiliates".
 
CONDUCT OF GROUP PRIOR TO THE MERGER AND OTHER COVENANTS
 
     Limitation on Group's Conduct Prior to Effective Time of the Merger. The
Amended Merger Agreement provides that between the date of the Amended Merger
Agreement and the Effective Time, except as permitted by the Amended Merger
Agreement and subject to the requirements of laws and regulations generally
applicable to California corporations, or unless Dominguez shall otherwise
provide its written consent, Group and the wholly-owned subsidiaries of Group
("Group Subsidiaries") will not, among other things:
 
          (a) take any action which would or is reasonably likely to (i)
     adversely affect the ability of Group or Cal Water to obtain any necessary
     approvals of any Governmental Entity required for the Merger or the
     transactions contemplated by the Amended Merger Agreement; (ii) adversely
     affect Group's or Cal Water's ability to perform their covenants and
     agreements under the Amended Merger Agreement; (iii) result in any of the
     conditions to the performance of Group's or Cal Water's obligations under
     the Amended Merger Agreement not being satisfied; or (iv) prevent listing
     on the NYSE of the shares of Group Common Stock to be issued to Dominguez
     Shareholders;
 
          (b) take or cause to be taken any action which would disqualify the
     Merger as a "reorganization" within the meaning of Section 368(a) of the
     Code or prevent Group from accounting for the business combination to be
     effected by the Merger as a pooling-of-interests;
 
          (c) amend its articles of incorporation in any respect which would
     materially and adversely affect the rights and privileges attendant to the
     Group Common Stock, other than in connection with Group's anticipated
     reincorporation as a Delaware corporation (See "Group Reincorporation as a
     Delaware Corporation");
 
          (d) enter into any transaction or agreement which would result in its
     debt rating being reduced below investment grade;
 
          (e) enter into any transaction or series of transactions which would
     result in it engaging in operations or lines of business other than those
     conducted by Group as of the date of the Amended Merger Agreement;
 
          (f) reduce its common stock dividend below its payment level at the
     date of the Amended Merger Agreement;
 
          (g) enter into any transaction which would result in the acquisition
     in any manner, directly or indirectly, of an equity interest in Group
     representing more than 50% of the Group Common Stock then outstanding, or
     the acquisition of more than 50% of the assets of Group, nor shall the
     Group Board nor any committee thereof approve or recommend, or propose to
     approve or recommend, any such transaction; or
 
          (h) agree or commit to take any of the prohibited actions described
     above.
 
                                       36
<PAGE>   45
 
     Affirmative Conduct of Group and Group Subsidiaries Prior to Effective
Time. The Amended Merger Agreement provides that between the date of the Amended
Merger Agreement and the Effective Time, Group shall, and shall cause the Group
Subsidiaries to, among other things:
 
          (a) use commercially reasonable efforts consistent with the Amended
     Merger Agreement to maintain and preserve intact their respective present
     business organizations and to maintain and preserve the relationships and
     goodwill with customers, employees and others having business relationships
     with Group or any of the Group Subsidiaries;
 
          (b) duly observe and conform in all material respects to all lawful
     requirements applicable to the business of Group and each of the Group
     Subsidiaries;
 
          (c) make available to Dominguez Group SEC filings at the time of
     filing, press releases at the time of release, and monthly unaudited
     balance sheets and income statements of Group within 25 days after the
     close of each calendar month;
 
          (d) use its commercially reasonable efforts to obtain any required
     third party consent to the Merger with respect to any contract, agreement,
     lease, license, arrangement, permit or release that is material to the
     business of Group on a consolidated basis or that is contemplated by the
     Amended Merger Agreement as being required in connection with the Merger;
 
          (e) furnish to Dominguez in a timely manner, and in any event within
     15 days after it is prepared, a copy of any communication submitted to the
     Group Board or any committee thereof, provided, however, that Group need
     not furnish to Dominguez communications regarding Group's rights and
     obligations under the Amended Merger Agreement or the transactions
     contemplated thereby, or the relevant details of certain transactions
     proposed to Group, or books, records and documents covered by
     confidentiality agreements or the attorney-client privilege, or which are
     attorneys' work product;
 
          (f) cause to be accurate all Group or Group Subsidiaries filings with
     any Governmental Entity;
 
          (g) promptly notify Dominguez of any event of which Group obtains
     knowledge which has or may have a materially adverse affect on Group or the
     determination by Group that it is unable to meet any of the conditions set
     forth in the Amended Merger Agreement that are conditions precedent to the
     performance of Dominguez' obligations thereunder;
 
          (h) promptly deliver copies of all communications and reports sent to
     Group Shareholders, all reports that Group files with the Commission and
     copies of all reports submitted to the Group Board, subject to exceptions
     to reports relating to the Amended Merger Agreement, the transactions
     contemplated thereby, certain other transactions, attorney-client
     privileged matters or attorneys' work product;
 
          (i) prepare and file all applications required to be filed by Group or
     any Group Subsidiary in connection with the Merger and provide to Dominguez
     all information relating to Group and the Group Subsidiaries required by
     Dominguez in connection with any applications to be filed by Dominguez in
     connection with the Merger or the transactions contemplated by the Amended
     Merger Agreement;
 
          (j) qualify or register for offer and sale the shares of Group stock
     to be issued in connection with the Merger, to the extent required, under
     the Securities Act of 1933 (the "Securities Act") and the securities laws
     of each jurisdiction in which Dominguez Shareholders reside;
 
          (k) use its reasonable best efforts to publish as promptly as
     reasonably practical, but in no event later than 45 days after the end of
     the first month after the Effective Time in which there are at least 30
     days of post-Merger combined operations, combined sales and net income
     figures that are contemplated by and in accordance with the terms of SEC
     Accounting Series Release No. 135; and
 
          (l) make all filings with the SEC described in Section (c) of Rule 144
     under the Act for a two year period following the Effective Time.
 
                                       37
<PAGE>   46
 
NO SOLICITATION OF TRANSACTIONS
 
     The Amended Merger Agreement provides that Dominguez and the Dominguez
Subsidiaries will not authorize or permit any of their respective officers,
directors, employees, accountants, investment bankers, financial advisors or
other representatives retained by them or their affiliates (collectively,
"Representatives"), to initiate, solicit or encourage (including by way of
furnishing information or assistance), or take any other action to facilitate,
any inquiries or the making of any proposal which constitutes, or may reasonably
be expected to lead to, any Competing Transaction (as defined below), or
negotiate with any person in furtherance of such inquiries or to obtain a
Competing Transaction, or agree to or endorse any Competing Transaction;
provided, however, that, notwithstanding any other provision of the Amended
Merger Agreement, the obligations of Dominguez in the Amended Merger Agreement
are subject to the continuing fiduciary duties of the Dominguez Board to the
Dominguez Shareholders, and Dominguez may engage in discussions or negotiations
with a third party who (without any solicitation, initiation, encouragement,
discussion or negotiation, directly or indirectly, by or with the party or its
authorized representatives) seeks to initiate such discussions or negotiations
and furnish such third party information concerning itself and its business,
properties and assets, and Dominguez may accept a Competing Transaction proposal
from such third party if such third party shall first have made an unsolicited
Competing Transaction proposal to Dominguez that the Dominguez Board reasonably
believes in good faith may be a Superior Proposal (as defined below). Dominguez
shall promptly notify Group (orally and in writing) of all relevant details
relating to all inquiries and proposals which it receives relating to any such
matters. Furthermore, nothing shall prohibit Dominguez from taking and
disclosing to its shareholders a position on any Competing Transaction takeover
proposal contemplated by Rule 14e-2(a) of the Securities Exchange Act of 1934.
 
     The Amended Merger Agreement defines "Competing Transaction" to mean any of
the following involving Dominguez: (i) any merger, consolidation, share exchange
involving 50% or more of the voting power of Dominguez or other business
combination; (ii) a sale, lease, exchange, mortgage, pledge, transfer or other
disposition of assets representing 30% or more of the assets of Dominguez; (iii)
a sale by Dominguez of shares of capital stock (or securities convertible or
exchangeable into or otherwise evidencing, or any agreement or instrument
evidencing, the right to acquire capital stock), representing 30% or more of the
voting power of Dominguez; (iv) a tender offer or exchange offer for at least
50% of the outstanding shares of Dominguez; (v) a solicitation of proxies in
opposition to approval of the Merger by Dominguez' Shareholders; or (vi) a
public announcement of an unsolicited bona fide proposal, plan, or intention to
do any of the foregoing.
 
     The Amended Merger Agreement defines "Superior Proposal" as a Competing
Transaction for consideration consisting of cash and/or securities and otherwise
on terms and conditions which a majority of the members of the Dominguez Board
determines in its good faith and reasonable judgment (based on the advice of a
financial advisor of nationally recognized reputation) to be more favorable to
Dominguez Shareholders than the terms of the Merger contained in the Amended
Merger Agreement.
 
PAYMENT IN EVENT OF TERMINATION RESULTING FROM SUPERIOR PROPOSAL AND ALTERNATIVE
TRANSACTION
 
     The Amended Merger Agreement provides that Dominguez shall pay to Group as
liquidated damages, the sum of $1.5 million if the Merger is not consummated by
reason of one of the following events and Group has not failed to any material
extent to perform its obligations under the Amended Merger Agreement: (i) the
Dominguez Board or any committee thereof shall have withdrawn or modified in a
manner adverse to Group its approval or recommendation of the Merger or the
Amended Merger Agreement or shall have recommended a Superior Proposal; (ii)
Dominguez shall have entered into any agreement (other than a confidentiality
agreement) with respect to a Superior Proposal; (iii) the Dominguez Board shall
have resolved to any of the foregoing; or (iv) those four members of the
Dominguez Board who are affiliates, directors, shareholders or officers of the
two largest shareholders of Dominguez as of the date of the Amended Merger
Agreement all shall have withdrawn or modified in a manner adverse to Group
their approval or recommendation of the Merger or the Amended Merger Agreement,
or shall have recommended a Superior Proposal. Furthermore, if the Merger is not
consummated and, within 24 months after the effective date of the termination of
the Amended Merger Agreement, Dominguez shall have consummated a Superior
Proposal
 
                                       38
<PAGE>   47
 
with the person whose Superior Proposal was recommended by the Dominguez Board,
and Group had not failed to any material extent to perform its obligations under
the Merger Agreement, Dominguez shall pay Group, as additional liquidated
damages, the sum of $1.2 million in addition to the $1.5 million payable to
Group following termination of the Amended Merger Agreement, as described above.
These liquidated payments shall be made within 30 days after Group notifies
Dominguez in writing that the triggering event for the liquidated damages has
occurred.
 
EMPLOYEE AND EMPLOYEE BENEFIT MATTERS
 
     The Amended Merger Agreement provides that Group shall offer equivalent
employment to all persons who are employed by Dominguez and the Dominguez
Subsidiaries immediately prior to the Effective Time. Those Dominguez employees
who are offered employment requiring a transfer of more than 50 miles and who
decide not to accept employment with Group shall receive severance packages
consistent with Dominguez' past practices and acceptable to Group. The Amended
Merger Agreement provides that Group will merge the Dominguez 401(k) plan with
and into Group's 401(k) plan as soon as administratively feasible after the
Effective Time; provided, however, that this merger of plans shall not occur
unless Group determines, in its sole discretion, that the Dominguez plan is a
qualified plan under Section 401(a) of the Code and there are no facts that
would be reasonably likely to adversely effect the qualified status of that
plan. If it is determined that the Dominguez plan is not a qualified plan,
Dominguez will use its best effort to have that plan qualified prior to the
Effective Time.
 
     As soon as practicable after the Effective Time, all other Dominguez
employee benefits plans will be discontinued or merged into Group's plans, in
the discretion of Group, and employees of Dominguez shall become eligible for
the employee benefit plans of Group on the same terms as such plans and benefits
are generally offered from time to time to employees of Group and the Group's
Subsidiaries in comparable positions. Group shall recognize Dominguez employees
years of service with Dominguez for purposes of determining employment
eligibility and vesting under the Group employee benefit plans.
 
CONDITIONS TO THE MERGER
 
     The obligation of each of the parties to consummate the Merger is
conditioned upon the satisfaction at or prior to the Effective Time of, among
other things, each of the following: (i) the approval of the Amended Merger
Agreement and the transactions contemplated by the Amended Merger Agreement by
the required vote of the Dominguez Shareholders; (ii) the receipt of all
regulatory approvals required to consummate the transactions contemplated by the
Amended Merger Agreement and the expiration of all applicable waiting periods;
(iii) no judgment, order, decree, injunction or proceeding shall be outstanding
or threatened by any Governmental Entity that prohibits or restricts
consummation of any of the transactions contemplated by the Amended Merger
Agreement unless an opinion of counsel is received that such judgment, order,
decree, injunction or proceeding is without merit; (iv) the representations and
warranties of each party contained in the Amended Merger Agreement shall have
been true and correct at the date of the Amended Merger Agreement and at the
Closing Date except for any such representations and warranties made as to
changes expressly contemplated by the Amended Merger Agreement or as of a
specified earlier date, which shall be true and correct as of such date, and
other than any inaccuracies which would not be reasonably likely, individually
or in the aggregate, to have a Material Adverse Effect on the party by whom such
representations and warranties were made (and the covenants of the other party
will have been performed or complied with in all material respects); (v) no stop
order suspending the effectiveness of the Registration Statement, of which this
Proxy-Prospectus is a part, will have been issued and no proceedings for that
purpose will have been initiated or threatened by the SEC; (vi) Group and
Dominguez shall have received from Group's independent public accountants, KPMG
LLP ("KPMG"), an opinion, dated in each case prior to the date hereof, as
described under "Material Federal Income Tax Consequences" (this opinion has
been delivered and is dated January 12, 1999), which opinion has not been
materially modified or withdrawn prior to the Effective Time; (vii) the shares
of Group Common Stock issuable pursuant to the Amended Merger Agreement shall
have been approved for listing on the NYSE, subject to official notice of
issuance; (viii) Group shall have received from KPMG, its opinion that the
Merger will qualify for "pooling of interests" accounting treatment under
generally accepted accounting principles ("GAAP"); (ix) between the date of the
Amended Merger
                                       39
<PAGE>   48
 
Agreement and the Effective Time, there shall not have occurred any event that
has had or could reasonably be expected to have a Material Adverse Effect on the
parties; (x) holders of 5% or more of the Dominguez Common Stock shall not have
exercised their appraisal rights as dissenting shareholders and demanded cash
payment for the fair market value of their Dominguez shares in accordance with
Section 1301 of the CGCL; (xi) the delivery of certain opinion letters from the
respective legal firms representing Group and Dominguez to the other party;
(xii) the delivery of certain officers' certificates executed by the Chief
Executive Officer and Chief Financial Officer of each company to the other
company certifying compliance with certain provisions of the Amended Merger
Agreement; (xiii) Group shall have received satisfactory evidence that the
Dominguez 1997 Stock Option Plan has been terminated prior to the Effective
Time; and (xiv) all consents from third parties to Dominguez' material
mortgages, notes, leases, franchise agreements, licenses and permits that are
necessary to permit the Merger and the transactions contemplated by the Amended
Merger Agreement to be consummated shall have been obtained by Dominguez, except
where the failure to obtain a consent would not have a Material Adverse Effect
on Dominguez or on Group following the Merger.
 
     No assurance can be provided as to if or when the regulatory approvals
necessary to consummate the Merger will be obtained or whether all of the other
conditions precedent to the Merger will be satisfied or waived by the party
permitted to do so.
 
TERMINATION OF THE AMENDED MERGER AGREEMENT
 
     The Amended Merger Agreement shall terminate if the Merger has not closed
by November 13, 1999 (the "Drop Dead Date") unless extended in writing by Group
and Dominguez. If CPUC approval of the Merger is pending when all of the
following events have occurred: (i) the approval of the Amended Merger Agreement
and the transactions contemplated thereby by the Dominguez Shareholders, (ii)
the receipt of all permits, authorizations, approvals (with the exception of
CPUC approval) and consents specified in Section 9.3 of the Amended Merger
Agreement, (iii) the expiration of all applicable waiting periods under the law,
and (iv) the expiration of the thirty-day period following the mailing by
Dominguez of a notice of approval of the Merger by the outstanding shares
pursuant to Section 1301 of the CGCL, then the Drop Dead Date will be August 13,
2000.
 
     The Amended Merger Agreement may be terminated, and the Merger may be
abandoned at any time prior to the Effective Time, (i) by the mutual written
consent of the Boards of Directors of the parties; (ii) by either party in the
event of a material breach by the other party of any of its covenants or
agreements contained in the Amended Merger Agreement, which breach has not been
cured within 90 days after the giving of written notice to the breaching party
of such breach or if such cure has not occurred by the Drop Dead Date and which
breach results in an Material Adverse Effect on the non-breaching party; (iii)
by either party, if required shareholder approval of the Merger is not obtained
at the Dominguez Special Meeting; (iv) by either party upon the expiration of 30
days after any Governmental Entity denies or refuses to grant any approval,
consent or authorization required to be obtained in order to consummate the
transactions contemplated by the Amended Merger Agreement unless, within that 30
day period, the parties agree to resubmit the application to that Governmental
Entity; (v) by either party if any conditions to its performance have not been
met by the other party prior to the Drop Dead Date, or such earlier time as it
becomes apparent that such condition shall not be met; (vi) by either party if
KPMG withdraws or modifies in any material respect its opinion that it
previously delivered to the parties to the effect that the Merger shall not
result in the recognition of gain or loss for federal income tax purposes to the
parties, nor shall the issuance of the Group Common Stock result in recognition
of gain or loss by the Dominguez Shareholders who receive such stock in
connection with the Merger; (vii) by Group if KPMG shall fail to deliver a
written opinion to Group, that, to the best of its knowledge, the Merger will
qualify for pooling of interests accounting treatment; (viii) by Dominguez or
Group if any conditions set forth in Article IX of the Amended Merger Agreement
shall not have been met by the Drop Dead Date; (ix) by Dominguez if any of the
conditions set forth in Article X of the Amended Merger Agreement shall not have
been met or by Group if any of the conditions set forth in Article XI of the
Amended Merger Agreement shall not have been met by the Drop Dead Date, or such
earlier time as it becomes apparent that such conditions shall not be met; and
(x) by Group if Dominguez shall have violated its obligations contained in the
Amended Merger Agreement that prohibit Dominguez and
 
                                       40
<PAGE>   49
 
its representatives from initiating, soliciting or encouraging any Competing
Transaction. In addition, if the Dominguez Board receives a bona fide proposal
for a Competing Transaction which it has determined to be a Superior Proposal,
the Dominguez Board may withdraw or modify its approval or recommendation of the
Amended Merger Agreement or the Merger and may terminate the Amended Merger
Agreement, in each case at any time after the fifth business day following
Group's receipt of written notice advising Group that the Dominguez Board has
received a Superior Proposal, specifying the material terms and conditions of
such Superior Proposal and identifying the person making such Superior Proposal.
 
     If the Amended Merger Agreement is terminated because the Merger shall not
have closed by the Drop Dead Date, unless extended in writing by the parties, or
is terminated for any of the reasons set forth in clause (i) (mutual agreement
to terminate), (v) (conditions to performance not met), (vi) (withdrawal of tax
opinion) or (vii) (failure to obtain pooling opinion), of the preceding
paragraph, no party to the Amended Merger Agreement will have any liability or
further obligations to any other party except for (1) the breach of certain
representations, warranties, covenants and agreements that survive termination
of the Amended Merger Agreement and (2) to the extent such termination results
from a party's willful and material breach of the warranties and representations
made by it or its willful and material failure to perform any of its covenants,
agreements or obligations under the Amended Merger Agreement. If the Amended
Merger Agreement is terminated pursuant to clause (ii) of the preceding
paragraph (material breach of Merger Agreement), then the breaching party shall
promptly pay to the non-breaching party an amount equal to all out-of-pocket
expenses and fees incurred by the non-breaching party (including, without
limitation, fees and expenses payable to all legal, accounting, financial
representatives and other professional advisors) in connection with or related
to the Merger or the transactions contemplated by the Amended Merger Agreement,
not to exceed $1.5 million in the aggregate ("Out of Pocket Expenses"). If,
however, Dominguez terminates the Amended Merger Agreement as a result of Group
agreeing to acquire, merge, or consolidate with another entity, which agreement
by its terms requires that the transactions contemplated by the Amended Merger
Agreement shall not be completed by the Drop Dead Date, or which transaction any
governmental entity advised Group in writing would result in the disapproval of
the transactions contemplated in the Amended Merger Agreement, then, provided
such transaction is consummated prior to termination of the Amended Merger
Agreement or during the 12 month period following termination of the Amended
Merger Agreement, Dominguez would be entitled, in addition to the Out of Pocket
Expenses otherwise provided for, to all other rights and remedies available to
it at law or in equity, without regard to the $1.5 million maximum. If the
Amended Merger Agreement is terminated pursuant to clause (iii) (failure to
obtain approval of Merger Agreement by Dominguez Shareholders) or (x) (Dominguez
violation of prohibitions against initiating, soliciting or encouraging any
Competing Transaction) of the preceding paragraph, then Dominguez shall pay to
Group, Group's Out of Pocket Expenses, not to exceed $1.5 million in the
aggregate. If the Amended Merger Agreement is terminated pursuant to clause (iv)
(failure to obtain required regulatory approvals for Merger) of the preceding
paragraph, Group shall pay to Dominguez its Out of Pocket Expenses, not to
exceed $1.5 million in the aggregate.
 
     In addition, the Amended Merger Agreement provides that Dominguez shall pay
to Group as liquidated damages the sum of $1.5 million (less any Out of Pocket
Expenses paid to Group) if the Amended Merger Agreement is terminated as a
result of certain actions by Dominguez in connection with any Superior Proposal
that it may receive for a Competing Transaction and an additional $1.2 million
if a transaction is consummated with the party proposing the Superior Proposal.
See "Payment in Event of Termination Resulting from Superior Proposal and
Alternative Transaction".
 
AMENDMENT; EXPENSES
 
     Subject to compliance with applicable law, any provision of the Amended
Merger Agreement may be amended or modified at any time, by an agreement in
writing among the parties approved by their respective Boards of Directors,
provided, however, that, after Dominguez Shareholder approval, no such amendment
that under applicable law requires further Dominguez Shareholder approval shall
be made without such shareholder approval.
 
                                       41
<PAGE>   50
 
     Each party to the Amended Merger Agreement will bear all expenses incurred
by it in connection with the Amended Merger Agreement and the transactions
contemplated thereby, except for those certain situations described above
relating to the termination of the Amended Merger Agreement.
 
MATERIAL FEDERAL INCOME TAX CONSEQUENCES
 
     The following is a summary of the material U.S. federal income tax
consequences of the Merger to holders of Dominguez Common Stock who hold such
stock as a capital asset. This summary is based on the Code, Treasury
regulations thereunder, and administrative rulings and court decisions in effect
as of the date hereof, all of which are subject to change at any time, possibly
with retroactive effect. This summary is not a complete description of all of
the consequences of the Merger and, in particular, may not address U.S. federal
income tax considerations applicable to Dominguez Shareholders subject to
special treatment under U.S. federal income tax law (including, for example,
non-U.S. persons, financial institutions, dealers in securities, insurance
companies or tax-exempt entities, holders who acquired Dominguez Common Stock
pursuant to the exercise of an employee stock option or right or otherwise as
compensation, and dissenting Dominguez Shareholders). In addition, no
information is provided herein with respect to the tax consequences of the
Merger under applicable foreign, state or local laws.
 
     HOLDERS OF DOMINGUEZ COMMON STOCK ARE URGED TO CONSULT WITH THEIR TAX
ADVISOR REGARDING TAX CONSEQUENCES OF THE MERGER PARTICULAR TO THEM, INCLUDING
THE EFFECTS OF U.S. FEDERAL, STATE AND LOCAL, FOREIGN AND OTHER TAX LAWS.
 
     In connection with the filing of the Registration Statement, Group and
Dominguez have received an opinion of KPMG, dated January 12, 1999 and based
upon certain customary assumptions and factual representations (including
representations of Group and Dominguez), that for U.S. federal income tax
purposes:
 
          (i) the Merger will constitute a reorganization under Section 368(a)
     of the Code and that the parties to the Amended Merger Agreement will be
     parties to the reorganization;
 
          (ii) no gain or loss will be recognized by Dominguez, Group or Cal
     Water as a result of the Merger; and
 
          (iii) no gain or loss will be recognized by Dominguez Shareholders who
     exchange all of their Dominguez Common Stock solely for Group Common Stock
     pursuant to the Merger (except with respect to cash received in lieu of a
     fractional share interest in Group Common Stock).
 
     The obligations of the parties to consummate the Merger are conditioned
upon this tax opinion not being withdrawn or modified in any material respect.
The tax opinion is not binding on the Internal Revenue Service (the "IRS") or on
the courts, and the parties do not intend to request a ruling from the IRS with
respect to the Merger. Accordingly, there can be no assurance that the IRS will
not challenge such conclusions or that a court will not sustain any such
challenge.
 
     Cash received by a Dominguez Shareholder in lieu of a fractional share
interest in Group Common Stock will be treated as received in redemption of such
fractional share interest, and a Dominguez Shareholder should generally
recognize capital gain or loss for U.S. federal income tax purposes measured by
the difference between the amount of cash received and the portion of the tax
basis of the share of Dominguez Common Stock allocable to such fractional share
interest. Such capital gain or loss will be a long-term capital gain or loss if
the holding period for such share of Dominguez Common Stock is greater than one
year at the Effective Time.
 
     The tax basis of the Group Common Stock received by a Dominguez Shareholder
in the Merger will be the same as such shareholder's tax basis in the Dominguez
Common Stock surrendered in exchange therefor, decreased by the tax basis
allocated to any fractional share interest exchanged for cash. The holding
period of a share of Group Common Stock received in the Merger (including
fractional share interests deemed received
 
                                       42
<PAGE>   51
 
and redeemed as described above) by Dominguez Shareholders, will include such
shareholder's holding period in the Dominguez Common Stock surrendered in
exchange therefor.
 
ACCOUNTING TREATMENT
 
     Group and Dominguez intend that the Merger will be accounted for as a
"pooling of interests" under GAAP and the receipt by each party of an opinion
from KPMG, that the Merger will qualify for such accounting treatment is a
condition to the parties' obligations to consummate the Merger. The unaudited
pro forma financial information included in this Proxy Statement-Prospectus
reflects the Merger using the "pooling of interests" method of accounting. See
"Unaudited Pro Forma Condensed Combined Financial Information"; "Summary
Historical and Unaudited Pro Forma Financial Data of Group and Dominguez."
 
REGULATORY MATTERS
 
     State Approvals and Related Matters. Both Group's principal operating
subsidiary, Cal Water, and Dominguez' principal operating subsidiary, Dominguez
Water Corporation ("Dominguez Water"), are subject to the jurisdiction of the
CPUC. Group and Dominguez filed a joint application with the CPUC on January 27,
1999, seeking the necessary approvals of the Merger and certain related matters.
To approve the Merger under applicable law, the CPUC must, in general, find that
the Merger is in the public interest, including, but not limited to, the
interest of the ratepayers served by the utilities that are involved in the
Merger. The CPUC may attach such conditions to its approval as it determines to
be appropriate or necessary. Under applicable law, the CPUC is mandated to rule
on the application within 18 months after its filing.
 
     Dominguez cannot predict what action the CPUC will take with respect to
approval of the Merger or whether any such approval may be subject to conditions
or restrictions. Dominguez can not predict when the necessary CPUC approval will
be obtained.
 
     Antitrust Considerations. The Hart-Scott-Rodino Antitrust Improvements Act
of 1976 (the "HSR Act") and the rules and regulations promulgated thereunder
provide that certain transactions (including the Merger) may not be consummated
until certain information has been submitted to the Antitrust Division of the
Department of Justice (the "Antitrust Division") and the Federal Trade
Commission (the "FTC") and specified HSR Act waiting period requirements have
been satisfied. The expiration or earlier termination of the HSR Act waiting
period would not preclude the Antitrust Division or the FTC from challenging the
Merger on antitrust grounds. Group and Dominguez do not believe that the Merger
will violate federal antitrust laws. If the Merger is not consummated within 12
months after the expiration or earlier termination of the initial HSR Act
waiting period, Dominguez and Group would be required to submit new information
to the Antitrust Division and the FTC, and a new HSR Act waiting period would
have to expire or be earlier terminated before the Merger could be consummated.
Dominguez and Group intend to file their pre-merger notifications pursuant to
the HSR Act such that the Effective Time will occur within 12 months after
expiration or earlier termination of the waiting period.
 
     The Amended Merger Agreement provides that the obligation of each of Group
and Dominguez to consummate the Merger is conditioned upon the receipt of all
requisite regulatory approvals, including the approval of the CPUC. There can be
no assurance that any governmental agency will approve or take any required
action with respect to the Merger, and, if approval is received or action is
taken, there can be no assurance as to the date of such approval or action, that
such approval or action will not be conditioned upon matters that would cause
the parties to mutually consent to abandon the Merger or that no action will be
brought challenging such approval or action, or, if such a challenge is made,
the result thereof. The Amended Merger Agreement provides that if the Amended
Merger Agreement is terminated by either party because of the failure to obtain
necessary regulatory approvals for the Merger, Group shall pay Dominguez its Out
of Pocket Expenses up to $1.5 million.
 
     Group and Dominguez are not aware of any governmental approvals or actions
that may be required for consummation of the Merger other than as described
above. Should any other approval or action be required, Group and Dominguez
currently contemplate that such approval or action would be sought.
 
                                       43
<PAGE>   52
 
     THE MERGER CANNOT PROCEED IN THE ABSENCE OF THE REQUISITE REGULATORY
APPROVALS. THERE CAN BE NO ASSURANCE EITHER THAT THE REGULATORY APPROVALS WILL
BE OBTAINED OR AS TO THE DATES OF ANY SUCH APPROVALS.
 
     See "The Effective Time," "Conditions to the Merger" and "Termination of
the Amended Merger Agreement."
 
     Necessity of Receiving Third Party Consents. As a result of the Merger, all
contractual and other obligations and rights of Dominguez will be assumed by or
transferred to the Surviving Corporation by operation of law. Notwithstanding
such assumption or transfer by operation of law, certain of Dominguez'
agreements or arrangements and those of its principal subsidiary, Dominguez
Water (such as those relating to environmental permits, sales agreements, loan
agreements, indenture agreements, franchise agreements, easements and rights of
way and similar instruments), may by their terms require the consent of the
other party.
 
     Other. Dominguez has environmental permits and licenses that may need to be
renewed or replaced as a result of the Merger. Dominguez does not currently
anticipate any difficulties in obtaining such renewals or replacements.
 
     Restrictions on Resales by Affiliates. The shares of Group Common Stock
issuable to Dominguez Shareholders in the Merger have been registered under the
Securities Act. Such securities may be traded freely without restriction by
those Dominguez Shareholders who are not deemed to be "affiliates" of Group or
Dominguez. An "affiliate" of an entity, as defined by the rules promulgated
pursuant to the Securities Act, is a person who directly or indirectly through
one or more intermediaries, controls, is controlled by, or is under common
control with such entity.
 
     Shares of Group Common Stock received by those Dominguez Shareholders who
are deemed to be "affiliates" of Dominguez at the time of the Dominguez Special
Meeting may be resold without registration under the Securities Act only as
permitted by Rule 145 under the Securities Act or as otherwise permitted under
that Act. Shares of Group Common Stock received by persons who are deemed to be
"affiliates" of Group following the Merger may be sold by them only in
transactions permitted under the provisions of Rule 144 under the Securities
Act, or as otherwise permitted under that Act. Stop transfer instructions will
be given by Group to the transfer agent with respect to the Group Common Stock
to be received by persons subject to the restrictions described above, and the
certificates for such stock will be appropriately legended.
 
     SEC guidelines regarding qualifying for the "pooling of interests" method
of accounting also limit sales of shares of the acquiring and acquired company
by affiliates of either company in a business combination. SEC guidelines also
indicate that the pooling of interests method of accounting generally will not
be challenged on the basis of sales by affiliates of the acquiring or acquired
company if such affiliates do not dispose of any of the shares of the
corporation they own, or shares of a corporation they receive in connection with
a merger, during the period beginning 30 days before the merger is consummated
and ending when financial results covering at least 30 days of post-merger
operations of the combined companies have been published.
 
     Dominguez has agreed to cause each person who is an "affiliate" of
Dominguez (for purposes of Rule 145 under the Securities Act and for purposes of
qualifying the Merger for pooling of interests accounting treatment) to deliver
to Group, and Group has received from each such affiliate, a written agreement
intended to ensure compliance with the Securities Act and to preserve the
ability of the Merger to be accounted for as a pooling of interests.
 
RIGHTS OF DISSENTING SHAREHOLDERS
 
     Shareholders of a California corporation, the shares of which are listed on
a national securities exchange or on the over the counter margin stock list, do
not have dissenters' rights unless the holders of at least 5% of the class of
outstanding shares assert their dissenters' rights. Dominguez Common Stock is
traded on the Nasdaq. Accordingly, unless holders of at least 5% of the
Dominguez Common Stock assert their dissenters' rights (the "5% Requirement"),
no Dominguez Shareholder will be entitled to dissenters' rights in connection
with the Merger.
                                       44
<PAGE>   53
 
     The following is a summary of the principal steps a Dominguez Shareholder
must take to perfect dissenters' rights under the CGCL, if they are available.
The summary does not purport to be complete and is qualified in its entirety by
reference to Section 1300 through Section 1312 of the CGCL, a copy of which is
attached as Appendix "D" to this Proxy Statement-Prospectus. Any Dominguez
Shareholder who is considering exercising dissenters' rights is urged to review
carefully these provisions and to consult an attorney, since dissenters' rights
will be lost if the procedural requirements under the CGCL are not fully and
precisely satisfied. To perfect dissenters' rights, subject to the 5%
Requirement, a Dominguez Shareholder must satisfy each of the following
conditions:
 
     (i) No Vote in Favor of the Amended Merger Agreement. Shares of Dominguez
Common Stock ("Dissenter's Shares") held by the dissenting Dominguez Shareholder
(the "Dissenting Shareholder") must not be voted at the Dominguez Special
Meeting in favor of the Amended Merger Agreement. See "Dominguez Special
Meeting -- Matters to Be Considered." This requirement will be satisfied if a
proxy is signed and returned with instructions to vote against the Amended
Merger Agreement or to abstain from such vote, if no proxy is returned and no
vote is cast at the Dominguez Special Meeting in favor of the Amended Merger
Agreement, or if the Dissenting Shareholder revokes a proxy, and thereafter
abstains from voting with respect to the Amended Merger Agreement or votes
against the Amended Merger Agreement at the Dominguez Special Meeting. A vote in
favor of the Amended Merger Agreement at the Dominguez Special Meeting
constitutes a waiver of dissenters' rights. A proxy that is returned signed but
on which no voting preference is indicated will be voted in favor of the Amended
Merger Agreement and will constitute a waiver of dissenters' rights. A
Dissenting Shareholder may revoke such shareholder's proxy at any time before
its exercise by filing with Dominguez an instrument revoking it or a duly
executed proxy bearing a later date, or by attending and giving notice of the
revocation of the proxy in open meeting (although attendance at the Dominguez
Special Meeting will not in and of itself constitute revocation of a proxy). See
"Dominguez Special Meeting -- Proxies."
 
     (ii) Filing Written Demand. Not later than 30 days after the Dissenting
Shareholder is notified by Dominguez of the approval of the Merger by the
Dominguez Shareholders (the "Approval Notice"), the Dissenting Shareholder must
deliver to Group a written demand (the "Demand") for payment in cash of the fair
market value of the Dissenter's Shares. The Demand should be delivered to
Dominguez at 21718 South Alameda Street, Long Beach, CA 90810, Attention:
Corporate Secretary. It is recommended, although not required, that the Demand
be sent by registered or certified mail, return receipt requested. Voting
against the Amended Merger Agreement will not itself constitute a Demand. Group
will not send any further notice to Dominguez Shareholders as to the date on
which such Demand period expires.
 
     The Demand must identify the name and address of the holder of record of
the Dissenter's Shares, the number of Dissenter's Shares and the amount claimed
as the fair cash value thereof. A beneficial owner must, in all cases, have the
record holder submit the Demand in respect of the Dissenter's Shares. The Demand
must be signed by the shareholder of record (or by the duly authorized
representative of the shareholder) exactly as the shareholder's name appears on
the shareholder records of Dominguez. A Demand with respect to Dissenter's
Shares owned jointly by more than one person must identify and be signed by all
of the shareholders of record. Any person signing a Demand on behalf of a
partnership or corporation or in any other representative capacity (such as an
attorney-in-fact, executor, administrator, trustee or guardian) must indicate
the nature of the representative capacity and, if requested, must furnish
written proof of this capacity and such person's authority to sign the demand.
 
     Because only shareholders of record on the Dominguez Record Date may
exercise dissenters' rights, any person who beneficially owns shares that are
held of record by a broker, fiduciary, nominee or other holder and who wishes to
exercise dissenters' rights must instruct the record holder of the Dominguez
shares to satisfy the conditions outlined above. If a record holder does not
satisfy, in timely manner, all of the conditions outlined in this section,
"Rights of Dissenting Shareholders," the dissenters rights for all of the shares
held by that Dominguez Shareholder will be lost.
 
     From the time the Demand is given until either the termination of the
rights and obligations arising from such Demand or the purchase of the
Dissenter's Shares related thereto by Group, all rights accruing to the
 
                                       45
<PAGE>   54
 
holder of the Dissenter's Shares, including voting and dividend or distribution
rights, will be suspended. If any dividend or distribution is paid on Group
Common Stock during the suspension, an amount equal to the dividend or
distribution which would have been payable on the Dissenter's Shares, but for
such suspension, shall be paid to the holder of record of the Dissenter's Shares
as a credit upon the fair cash value of the Dissenter's Shares. If the right to
receive the fair market value is terminated otherwise than by the purchase of
the Dissenter's Shares by Group, all rights will be restored to the Dissenting
Shareholder and any distribution that would have been made to the holder of
record of the Dissenter's Shares, but for the suspension, will be made at the
time of the termination.
 
     (iii) Petitions to Be Filed in Court. Within six months after the service
of the Approval Notice, if Group and the Dissenting Shareholder do not reach an
agreement on the fair market value of the Dissenter's Shares, the Dissenting
Shareholder or Group may file a complaint in superior court (the "Superior
Court"), or join or be joined in an action similarly brought by another
Dissenting Shareholder, for a judicial determination of the fair market value
(as defined below) of the Dissenter's Shares. Group does not intend to file any
complaint for a judicial determination of the fair cash value of any Dissenter's
Shares.
 
     Upon motion of the complainant, the Superior Court will hold a hearing to
determine whether the Dissenting Shareholder is entitled to be paid the fair
cash value of the Dissenter's Shares. If the Superior Court finds that the
Dissenting Shareholder is so entitled, it may appoint one or more appraisers to
receive evidence by which to recommend a decision on the amount of such value.
The Superior Court is required to make a finding as to the fair cash value of
the Dissenter's Shares and to render a judgment against Group for the payment
thereof, with interest at such rate and from such date as the Superior Court
considers equitable. Costs of the proceedings, including reasonable compensation
to the appraiser or appraisers to be fixed by the Superior Court, are to be
apportioned or assessed as the Superior Court considers equitable. Payment of
the fair market value of the Dissenter's Shares is required to be made within 30
days after the date of final determination of such value or the Effective Time,
whichever is later, only upon surrender to Group of the certificates
representing the Dissenter's Shares for which payment is made.
 
     "Fair market value" is the amount which a willing seller, under no
compulsion to sell, would be willing to accept, and which a willing buyer, under
no compulsion to purchase, would be willing to pay, but in no event may the fair
cash value exceed the amount specified in the Demand. The fair market value
shall be determined as of a certain date, which will be on or about November 13,
1998, the last trading day before the first announcement of the terms of the
Merger. In computing this value, any appreciation or depreciation in the fair
market value of the Dissenter's Shares resulting from the Merger is excluded.
 
     The dissenters' rights of any Dissenting Shareholder will terminate if,
among other things, (i) the Dissenting Shareholder has not complied with the
applicable provisions of the CGCL (unless the Group Board waives compliance),
(ii) the Merger is abandoned or otherwise not carried out or such Dissenting
Shareholder withdraws its Demand with the consent of the Group Board, or (iii)
no agreement has been reached between Group and the Dissenting Shareholder with
respect to the fair cash value of the Dissenter's Shares and no complaint has
been timely filed in the Superior Court.
 
                                       46
<PAGE>   55
 
          UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL INFORMATION
 
     The following unaudited Pro Forma Condensed Combined Financial Information
and accompanying notes are presented to show the impact on the historical
financial position and the results of operations of Group, assuming the Merger
had been consummated as of the beginning of each period presented, and should be
read in conjunction with the consolidated financial statements, including the
notes thereto, of Group and Dominguez which are incorporated by reference in
this filing. The unaudited Pro Forma Condensed Combined Financial Information is
presented for illustration purposes only in accordance with the assumptions set
forth below, and is not necessarily indicative of the operating results or
financial position that would have occurred if the Merger had been consummated
nor is it necessarily indicative of the future operating results or financial
position of Group if the Merger is consummated.
 
     In accordance with the terms of the Amended Merger Agreement, each share of
Dominguez Common Stock outstanding immediately prior to the Effective Time will
be converted into between 1.25 and 1.49 shares of Group Common Stock depending
upon the market value of Group Common Stock for the twenty trading days prior to
and including the date which is five trading days prior to the Effective Time.
See "Description of the Merger" for a detailed explanation of the Exchange Ratio
provisions and application.
 
     The unaudited Pro Forma Condensed Combined Statements of Income for the
years ended December 31, 1998, 1997 and 1996 present the combined results of
operations of Group and Dominguez as if the Merger had been effective at the
beginning of each period presented, after the effect of certain adjustments
described in the Notes to the Unaudited Pro Forma Condensed Combined Financial
Information. The unaudited Pro Forma Condensed Combined Balance Sheet at
December 31, 1998 presents the combined balance sheet of Group and Dominguez as
if the Merger had been completed as of said date.
 
     Group and Dominguez expect that, subsequent to the Merger, Group will
achieve substantial benefits from the Merger, including operating cost savings
and revenue enhancements. The pro forma earnings do not reflect any potential
savings or revenue enhancements which are expected to result from the Merger,
and are not indicative of the results of future operations. No assurances can be
given with respect to the ultimate level of expense savings and revenue
enhancements to be realized.
 
                                       47
<PAGE>   56
 
                         CALIFORNIA WATER SERVICE GROUP
 
               PRO FORMA CONDENSED COMBINED STATEMENTS OF INCOME
                      FOR THE YEAR ENDED DECEMBER 31, 1998
                (AMOUNTS IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
                                  (UNAUDITED)
 
<TABLE>
<CAPTION>
                                                                          PRO FORMA     PRO FORMA
                                                 GROUP      DOMINGUEZ    ADJUSTMENTS    COMBINED
                                                --------    ---------    -----------    ---------
<S>                                             <C>         <C>          <C>            <C>
Operating revenue.............................  $186,273     $25,267                    $211,540
Operating expenses:
  Operations and maintenance..................   123,284      20,689      $    814       144,787
  Depreciation and amortization...............    14,563       1,439                      16,002
  Income taxes................................    10,550         932          (315)       11,167
  Property and other taxes....................     7,802         566                       8,368
                                                --------     -------      --------      --------
          Total operating expenses............   156,199      23,626           499       180,324
                                                --------     -------      --------      --------
 
Net operating income..........................    30,074       1,641          (499)       31,216
Interest expense..............................    12,446         870                      13,316
Other income and expenses, net................       767         652                       1,419
                                                --------     -------      --------      --------
Net income before extraordinary item..........  $ 18,395     $ 1,423          (499)     $ 19,319
                                                ========     =======                    ========
Extraordinary item net of $315 of income
  taxes.......................................        --        (499)          499            --
                                                --------     -------      --------      --------
Net income....................................  $ 18,395     $   924                    $ 19,319
                                                ========     =======                    ========
 
Earnings per share before extraordinary
  item........................................  $   1.45     $  0.94
Basic/dilutive earnings per share.............      1.45        0.61                    $   1.30
Average number of common shares outstanding --
  basic/diluted...............................    12,619       1,507                      14,683
</TABLE>
 
   See Notes to Unaudited Pro Forma Condensed Combined Financial Statements.
                                       48
<PAGE>   57
 
                         CALIFORNIA WATER SERVICE GROUP
 
               PRO FORMA CONDENSED COMBINED STATEMENTS OF INCOME
                      FOR THE YEAR ENDED DECEMBER 31, 1997
                (AMOUNTS IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
                                  (UNAUDITED)
 
<TABLE>
<CAPTION>
                                                                          PRO FORMA     PRO FORMA
                                                 GROUP      DOMINGUEZ    ADJUSTMENTS    COMBINED
                                                --------    ---------    -----------    ---------
<S>                                             <C>         <C>          <C>            <C>
Operating revenue.............................  $195,324     $26,818                    $222,142
Operating expenses:
  Operations and maintenance..................   125,778      21,311                     147,089
  Depreciation and amortization...............    13,670       1,341                      15,011
  Income taxes................................    13,950       1,385                      15,335
  Property and other taxes....................     7,577         552                       8,129
                                                --------     -------     -----------    --------
          Total operating expenses............   160,975      24,589                     185,564
                                                --------     -------     -----------    --------
 
Net operating income..........................    34,349       2,229                      36,578
Interest expense..............................    11,902         758                      12,660
Other income and expenses, net................       858         550                       1,408
                                                --------     -------     -----------    --------
Net income....................................  $ 23,305     $ 2,021                    $ 25,326
                                                ========     =======     ===========    ========
 
Earnings per share -- basic/diluted...........  $   1.83     $  1.34                    $   1.71
Average number of common shares outstanding --
  basic/diluted...............................    12,619       1,507                      14,683
</TABLE>
 
   See Notes to Unaudited Pro Forma Condensed Combined Financial Statements.
 
                                       49
<PAGE>   58
 
                         CALIFORNIA WATER SERVICE GROUP
 
               PRO FORMA CONDENSED COMBINED STATEMENTS OF INCOME
                      FOR THE YEAR ENDED DECEMBER 31, 1996
                (AMOUNTS IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
                                  (UNAUDITED)
 
<TABLE>
<CAPTION>
                                                                          PRO FORMA     PRO FORMA
                                                 GROUP      DOMINGUEZ    ADJUSTMENTS    COMBINED
                                                --------    ---------    -----------    ---------
<S>                                             <C>         <C>          <C>            <C>
Operating revenue.............................  $182,764     $24,705                    $207,469
Operating expenses:
  Operations and maintenance..................   120,323      19,438                     139,761
  Depreciation and amortization...............    12,665       1,307                      13,972
  Income taxes................................    12,150       1,314                      13,464
  Property and other taxes....................     7,259         448                       7,707
                                                --------     -------      --------      --------
          Total operating expenses............   152,397      22,507                     174,904
                                                --------     -------      --------      --------
 
Net operating income..........................    30,367       2,198                      32,565
Interest expense..............................    11,907         659                      12,566
Other income and expenses, net................       607         442                       1,049
                                                --------     -------      --------      --------
Net income....................................  $ 19,067     $ 1,981                    $ 21,048
                                                ========     =======      ========      ========
 
Earnings per share -- basic/diluted...........  $   1.50     $  1.31                    $   1.43
Average number of common shares outstanding --
  basic/diluted...............................    12,580       1,507                      14,644
</TABLE>
 
   See Notes to Unaudited Pro Forma Condensed Combined Financial Statements.
 
                                       50
<PAGE>   59
 
                         CALIFORNIA WATER SERVICE GROUP
 
                   PRO FORMA CONDENSED COMBINED BALANCE SHEET
                            AS OF DECEMBER 31, 1998
                             (AMOUNTS IN THOUSANDS)
                                  (UNAUDITED)
 
<TABLE>
<CAPTION>
                                                                             PRO FORMA    PRO FORMA
                                                      GROUP     DOMINGUEZ   ADJUSTMENTS   COMBINED
                                                    ---------   ---------   -----------   ---------
<S>                                                 <C>         <C>         <C>           <C>
ASSETS
  Utility plant...................................    680,690   $ 68,802                  $ 749,492
  Less depreciation and amortization..............    202,385     23,949                    226,334
                                                    ---------   --------      -------     ---------
     Net utility plant............................    478,305     44,853                    523,158
  Current assets:
     Cash and cash equivalents....................        591        709                      1,300
     Receivables..................................     19,406      2,519                     21,925
     Materials and supplies.......................      2,107         30                      2,137
     Taxes and other prepaid expenses.............      4,491      1,735                      6,226
                                                    ---------   --------      -------     ---------
          Total current assets....................     26,595      4,993                     31,588
 
  Regulatory assets...............................     39,538        809                     40,347
  Other assets....................................      4,061      1,980                      6,041
                                                    ---------   --------      -------     ---------
                                                      548,499   $ 52,635                  $ 601,134
                                                    =========   ========      =======     =========
CAPITALIZATION AND LIABILITIES
  Capitalization:
     Common stock.................................     44,941   $  1,506      $ 2,006     $  48,453
     Paid-in capital..............................         --      2,006       (2,006)           --
     Retained earnings............................    123,863     12,367                    136,230
                                                    ---------   --------      -------     ---------
          Total common shareholders' equity.......    168,804     15,879                    184,683
 
     Preferred stock..............................      3,475         --                      3,475
     Long-term debt including current portion.....    138,585     11,273                    149,858
                                                    ---------   --------      -------     ---------
          Total capitalization....................    310,864     27,152                    338,016
  Current liabilities:
     Short-term borrowings........................     22,500        450                     22,950
     Accounts payable.............................     15,881      3,115                     18,996
     Other accrued liabilities....................     14,907      1,536                     16,443
                                                    ---------   --------      -------     ---------
          Total current liabilities...............     53,288      5,101                     58,389
 
  Deferred income taxes and investment tax
     credits......................................     30,849      4,319                     35,168
  Advances for construction.......................     95,701      5,487                    101,188
  Contributions in aid of construction............     45,100      6,220                     51,320
  Regulatory liabilities..........................     12,697      4,356                     17,053
                                                    ---------   --------      -------     ---------
                                                      548,499   $ 52,635                  $ 601,134
                                                    =========   ========      =======     =========
</TABLE>
 
   See Notes to Unaudited Pro Forma Condensed Combined Financial Statements.
 
                                       51
<PAGE>   60
 
                     NOTES TO UNAUDITED PRO FORMA CONDENSED
                         COMBINED FINANCIAL STATEMENTS
 
(1) No material intercompany transactions took place between Group, including
    its subsidiaries, and Dominguez, including its subsidiaries, during the
    periods presented.
 
(2) All Group per share data has been restated to reflect the effective 2-for-1
    stock split on December 31, 1997.
 
(3) All Dominguez per share data has been restated to reflect the 3-for-2 stock
    split on January 2, 1998.
 
(4) Pro forma condensed combined per share data reflects the conversion of each
    share of Dominguez Common Stock into 1.37 shares of Group Common Stock, the
    midpoint between 1.25 shares of Group Common Stock and 1.49 shares of Group
    Common Stock (the range within which the actual Exchange Ratio must fall
    pursuant to the terms of the Amended Merger Agreement). The exact Exchange
    Ratio will be dependent upon the average closing price of Group Common Stock
    during a twenty trading day period preceding the Effective Time. See
    "Description of the Merger" for a detailed explanation of the Exchange Ratio
    provisions and application.
 
(5) The pro forma condensed combined financial statements are presented as if
    the two companies were combined during all periods presented.
 
(6) For the year ended December 31, 1998, Dominguez reported an extraordinary
    item related to merger expenses of $499,000, net of $315,000 of income
    taxes. The extraordinary item has been reclassified in the pro forma
    adjustment column of the 1998 Condensed Combined Statements of Income. The
    pro forma combined column reflects financial presentation of the merged
    companies.
 
(7) As noted in the section entitled "Group's Reasons for the Merger", certain
    cost synergies are anticipated to be realized by the combined company. The
    pro forma condensed combined financial statements do not reflect any of the
    cost savings estimated to be achieved from the Merger, nor do they reflect
    any substantial costs that will be incurred to complete the Merger.
 
(8) The adjustments shown in the Balance Sheets Pro Forma Adjustments column are
    to reclassify the Dominguez Paid in Capital to Common Stock in accordance
    with Group's financial statement presentation.
 
(9) The pro forma information is based on 1,507,000 outstanding shares of
    Dominguez common stock. In January 1999, Dominguez issued an additional
    54,000 shares to complete the acquisition of three water companies. After
    the acquisitions, there were 1,561,000 shares of Dominguez common stock
    outstanding.
 
                                       52
<PAGE>   61
 
                          INFORMATION ABOUT DOMINGUEZ
 
GENERAL
 
     Dominguez is a holding company created in 1990. Dominguez' principal
business is the ownership of all the common stock of Dominguez Water. The
holding company structure provides operational and financial flexibility and
allows Dominguez to engage in non-utility activities. Dominguez has two
wholly-owned subsidiaries: Dominguez Water, which is involved in water supply
and distribution, and DSC Investments, which is involved in non-regulated,
water-related services and investments.
 
     Dominguez Water and its operating subsidiaries (collectively referred to as
"Dominguez Water") are regulated by the CPUC. Dominguez Water produces and
supplies water for residential, commercial, public authority, business and
industrial customers. Dominguez Water is comprised of its principal division
(the South Bay division) and its operating subsidiaries, the Redwood Valley
Water Company, the Kern River Valley Water Company and the Antelope Valley Water
Company.
 
     The South Bay division has been providing water service for more than 87
years and is Dominguez Water's largest service area. The South Bay division
encompasses most of the City of Carson, one-quarter of Torrance, parts of
Compton, Long Beach, Harbor City and Los Angeles County, and serves
approximately 32,524 customer connections. Antelope Valley Water Company, with
1,259 customers, has four distinct service areas in northern Los Angeles County.
Kern River Valley Water Company, located in Kern County around Isabella Lake,
has nine distinct service areas and 4,099 customers. Dominguez Water's newest
division, the Redwood Valley Water Company division, was formed January 1, 1999,
has three service districts and serves about 1,620 customers in Sonoma and Lake
Counties in Northern California.
 
     DSC Investments' primary sources of income are from the transfer of water
rights between third parties and contract services. Income from the transfers of
water rights may significantly vary from year to year due to demands for
groundwater by major pumpers in the West and Central Groundwater Basins. DSC
Investments also holds a 20% ownership in Chemical Services Company ("CSC") with
an option to acquire an additional 40% interest through the year 2001. CSC
manufactures and distributes chlorine generators used in the water and
wastewater industry to produce safe on-site chlorine.
 
OPERATIONS
 
     In 1998, Dominguez Water supplied 11,569 million gallons of water to 37,882
customers, compared to 12,362 million gallons of water to 37,636 customers in
1997. The South Bay division produced 10,856 million gallons of water in 1998
and 11,702 million gallons in 1997. Although Dominguez Water has a diversified
customer base, a substantial portion, 50% in 1998 and 49% in 1997, of sales were
derived from business and industrial usage. Furthermore, a single customer, a
refinery, accounted for 34% of these business and industrial sales in 1998, and
for 33% in 1997.
 
WATER SUPPLY
 
     The water supplies for Dominguez Water come from its own groundwater wells
plus two water wholesalers of imported water.
 
     All service areas obtain either a portion of or all of their supply from
groundwater wells. The quantity that the South Bay division is allowed to pump
annually is fixed by court adjudication. The adjudication established distinct
groundwater basins, which are managed by a court-appointed watermaster. The
groundwater management fixes the safe yield of the basins and ensures the
replenishment of the basins by utilizing impounded storm water, treated recycled
water and purchased water when necessary. Groundwater basins have not been
adjudicated in the areas served by the subsidiaries of Dominguez Water.
 
     The South Bay division and Leona Valley service area of Antelope Valley
also purchase water from wholesalers to supplement groundwater. The South Bay
division purchases imported water from the Metropolitan Water District ("MWD")
of Southern California. The Leona Valley service area purchases its
 
                                       53
<PAGE>   62
 
imported water from Antelope Valley -- East Kern River Agency. Both of these
wholesale suppliers obtain water from the California State Water Project, and
MWD also obtains water from the Colorado River.
 
     Long-term imported water supplies are dependent upon several factors.
Dominguez Water's future dependency on imported water will be subject to the
availability and usage of recycled water in the region as well as customers'
long-term water conservation efforts.
 
     In December 1997, Dominguez Water entered into an agreement with West Basin
Municipal Water District ("West Basin") and ARCO Los Angeles Refinery in Carson
("ARCO"). Under the terms of the agreement, Dominguez Water will sell ARCO
recycled water purchased from West Basin for the same cost of water margin that
Dominguez Water would otherwise have received providing ARCO with potable water.
 
     Dominguez Water expects to commit funds up to $2,000,000 by December 1999
to construct recycled water facilities in its South Bay service area. At that
time, Dominguez Water will offer the recycled water to its customers. The
availability of recycled water will reduce Dominguez Water's demand for imported
water, the availability of which may be uncertain in the future. Reduced
imported water supplies and annual population growth could create future drought
conditions in Southern California; however, Dominguez Water believes that the
availability of recycled water will significantly mitigate the impact of future
droughts in the Dominguez Water service area.
 
WATER QUALITY
 
     Dominguez Water is subject to water quality regulations promulgated by the
United States Environmental Protection Agency and the California Department of
Health Services. Both groundwater and purchased water are subject to extensive
analysis. With occasional minor exceptions, Dominguez Water meets all current
primary water standards.
 
REGULATORY AFFAIRS
 
     In accordance with its usual procedures, Dominguez filed in February, 1999
general rate case applications for its South Bay Division and its operating
subsidiaries with respect to all of its operating divisions and subsidiaries
with the exception of its Redwood Valley division. The applications request a
cumulative rate increase of $5,872,000, based on a requested return on equity of
10.66% for test year 2000, 10.73% for year 2001, and an attrition allowance for
the year 2002. Dominguez and its subsidiaries anticipate that the new rates will
be effective January 1, 2000. There can be no assurance, however, as to the
amount of any rate increases that the CPUC will approve. The processing of these
applications will not be affected by the pendency or completion of the Merger.
Dominguez rate increases were last filed in 1992.
 
     Cal Water and Dominguez Water Corporation have filed a joint application
with the CPUC seeking its approval of the Merger and certain related matters. As
of the date of the Proxy Statement-Prospectus, two protests to the application
have been filed. Both protests raise issues related to the benefits accruing to
rate payers as a result of the Merger. The Merger cannot be completed without
the CPUC's approval and it can proceed only on the terms and subject to any
conditions and restrictions imposed by the CPUC. To approve the Merger, the CPUC
must conclude that the Merger is in the public interest, including the interest
of the ratepayers served by the companies. The CPUC may attach such terms,
conditions and restrictions to its approval of the Merger as it deems
appropriate or necessary. The law requires that the CPUC rule on the application
within 18 months of its filing (approximately, August 1, 2000). Dominguez can
give no assurance when or how the CPUC will rule on the application, and what
terms, conditions or restrictions, if any, the CPUC might impose on any approval
by it of the Merger. If any such terms, conditions or restrictions are not
acceptable to both Dominguez and Group, the Merger might not proceed.
Furthermore, any such terms, conditions or restrictions could materially and
adversely affect the anticipated future revenues of Group following the Merger.
 
                                       54
<PAGE>   63
 
NON-UTILITY SUBSIDIARY OPERATIONS
 
     DSC Investments invested $350,000 in CSC on December 20, 1996 and acquired
a 20% equity ownership with the option to acquire an additional 40% through the
year 2001. At December 31, 1998, $100,000 remained outstanding from CSC to
Dominguez pursuant to a promissory note. Dominguez has no further obligation to
lend funds to CSC, but it continues to hold the option to acquire an additional
40% interest in CSC.
 
     During 1998, DSC Investments facilitated transfers of water right leases
between third parties adding $549,000 to DSC's revenues. The future income from
the transfer of water right leases will depend upon the need to pump groundwater
by major industrial users and water purveyors.
 
DIRECTORS AND EXECUTIVE OFFICERS OF DOMINGUEZ
 
     The following table sets forth the names and ages of all directors and
executive officers of Dominguez, indicating the positions and offices presently
held by each.
 
<TABLE>
<CAPTION>
                   NAME                     AGE               POSITION AND OFFICE
                   ----                     ---               -------------------
<S>                                         <C>    <C>
Dwight C. Baum............................  86     Director
Richard M. Cannon.........................  57     Director
Terrill M. Gloege.........................  63     Director
Thomas W. Huston..........................  37     Director
C. Bradley Olson..........................  58     Director
Langdon W. Owen...........................  68     Director
Charles W. Porter.........................  68     Director
Debra L. Reed.............................  42     Director
Brian J. Brady............................  50     Chief Executive Officer, President and
                                                   Director, Chairman of the Board
John S. Tootle............................  45     Chief Financial Officer, Vice President of
                                                     Finance, Treasurer and Secretary
</TABLE>
 
     Mr. Baum has been a director of Dominguez since 1962. Mr. Baum also has
been Senior Vice President of PaineWebber Incorporated (and predecessors), an
investment banking firm, since prior to 1993; prior to 1993, Mr. Baum was an
advisory director of Blythe Eastman PaineWebber Incorporated.
 
     Mr. Cannon has been a director of Dominguez since 1991. Mr. Cannon also has
been Chief Executive Officer and President of Watson Land Company, a privately
held developer and owner of industrial centers and buildings, since 1994; prior
to that time, he served as President of Watson Land Company since 1989.
 
     Mr. Gloege has been a director of Dominguez since 1991. Mr. Gloege also has
been Senior Vice President and Chief Financial Officer of Carson Estate Company
and affiliated entities, a privately held investment company, since 1989.
 
     Mr. Huston has been a director of Dominguez since 1995. Since prior to
1993, Mr. Huston also has been Director of Leasing and Asset Management for
Watson Land Company; prior to that time, he served as Assistant Director of
Leasing and Asset Management and Leasing Agent for Watson Land Company.
 
     Mr. Olson has been a director of Dominguez since 1993. Mr. Olson also has
been President of Carson Estate Company and affiliates since 1993; prior to that
time, he served as Division President and Corporate Vice President of The Irvine
Company since 1984.
 
     Mr. Owen has been a director of Dominguez since 1994. Mr. Owen also has
been President of Don Owen & Associates, Consulting Engineer and Financial
Advisor, since 1973.
 
     Mr. Porter has been a director of Dominguez since 1977. Mr. Porter also has
been a Business Consultant since January 1996; prior to that time, Mr. Porter
served as President and Chief Executive Officer of the Company since 1980.
 
                                       55
<PAGE>   64
 
     Ms. Reed has been a director of Dominguez since 1995. Ms. Reed has been
President of Energy Distribution Services, a division of Southern California Gas
Company, since 1998 and was Senior Vice President of Southern California Gas
Company from 1995 to 1998. Prior to that time, she served as Vice President of
Southern California Gas Company since 1988.
 
     Mr. Brady has been President, Chief Executive Officer, and Chairman of the
Board of Dominguez since November 1995; prior to that time, he served as
Assistant General Manager Public Utilities, City of Anaheim, since 1992; and
prior to that time, he served as Vice President and General Manager, Energy
Services, Inc., a subsidiary of Southern California Edison, since 1988.
 
     Mr. Tootle has been Chief Financial Officer of Dominguez since 1987.
 
                                       56
<PAGE>   65
 
SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS OF DOMINGUEZ
 
     The following table sets forth information as of March 25, 1999, with
respect to the beneficial ownership of Dominguez' common stock by (i) each
person known by Dominguez to own beneficially 5% or more of any class of
outstanding Dominguez Common Stock, (ii) each director and named executive
officer, and (iii) all directors and executive officers as a group. Each
shareholder has sole voting and investment power with respect to such shares
unless otherwise indicated.
 
<TABLE>
<CAPTION>
                                                              NUMBER OF SHARES AND NATURE
            NAME AND ADDRESS OF BENEFICIAL OWNER                OF BENEFICIAL OWNERSHIP
            ------------------------------------              ---------------------------
<S>                                                           <C>
Carson Estate Company.......................................            307,657(7)
  18710 South Wilmington, Suite 200
  Rancho Dominguez, CA 90220
Watson Land Company.........................................            132,894
  515 South Figueroa Street, Suite 1910
  Los Angeles, CA 90071
Dwight C. Baum..............................................             33,750(1)
  200 South Los Robles Avenue, Suite 645
  Pasadena, CA 91101-2431
Richard M. Cannon...........................................            132,894(2)
  22010 South Wilmington Avenue, Suite 400
  Carson, CA 90745
Terrill M. Gloege...........................................              1,500(7)
  18710 South Wilmington Avenue, Suite 200
  Rancho Dominguez, CA 90220
Thomas W. Huston............................................                750
  22010 South Wilmington Avenue, Suite 400
  Carson, CA 90745
C. Bradley Olson............................................            308,157(3)(7)
  18710 South Wilmington Avenue, Suite 200
  Rancho Dominguez, CA 90220
Langdon W. Owen.............................................              9,950
  1300 Bristol North, Suite 290
  Newport Beach, CA 92660
Charles W. Porter...........................................              8,491
  400 Paseo Dorado
  Long Beach, CA 90803
Debra L. Reed...............................................                239
  555 West 5th Street
  Los Angeles, CA 90013
Brian J. Brady..............................................              4,380(4)
  21718 South Alameda Street
  Long Beach, CA 90810
John S. Tootle..............................................              5,141(5)
  21718 South Alameda Street
  Long Beach, CA 90810
All Directors and Officers as a group (10 persons)..........            505,252(6)
</TABLE>
 
- ---------------
(1) All such shares are owned by Mr. and Mrs. Baum as trustees of the Dwight C.
    Baum and Hildagarde E. Baum Trust. Mr. and Mrs. Baum share voting and
    investment powers with respect to such shares.
 
(2) All such shares are owned by Watson Land Company, of which Mr. Cannon is
    President, Chief Executive Officer, and a director. Mr. Cannon shares voting
    and investing powers with respect to such shares with the other directors of
    Watson Land Company.
 
(3) 307,657 of such shares are owned by the Carson Estate Company, of which Mr.
    Olson is President and a director. Mr. Olson shares voting and investment
    powers with respect to such shares with the other directors of Carson Estate
    Company. The remaining 500 shares are owned by Mr. Olson individually.
 
(4) Includes 2,250 currently exercisable options held by Mr. Brady.
 
                                       57
<PAGE>   66
 
(5) Includes 1,350 currently exercisable options held by Mr. Tootle.
 
(6) Includes shares described in footnotes (2) and (3) above, and includes 2,250
    currently exercisable options held by Mr. Brady and 1,350 currently
    exercisable options held by Mr. Tootle.
 
(7) On March 30, 1999, the Carson Estate Company transferred 159,364 shares of
    its 307,657 shares of Dominguez' common stock to the Carson Dominguez Real
    Estate Corporation. Mr. Gloege and Mr. Olson are directors of the Carson
    Dominguez Real Estate Corporation.
 
     ADDITIONAL INFORMATION
 
     Certain additional information relating to executive compensation and
various benefit plans (including stock option plans) is incorporated by
reference into, or set forth in, Dominguez' Annual Report on Form 10-K for the
year ended December 31, 1998, which is incorporated by reference into this Proxy
Statement-Prospectus. See "Where You Can Find More Information."
 
                                       58
<PAGE>   67
 
                     INFORMATION ABOUT GROUP AND CAL WATER
 
     Cal Water was formed in 1926. In April 1997, shareholders of Cal Water
voted to approve a holding company structure. After receiving final regulatory
approval, Group was formed on December 31, 1997. As a result of the holding
company structure, Cal Water became one of Group's two wholly-owned, operating
subsidiaries.
 
     Cal Water is the largest investor-owned water company in California and the
fourth largest in the United States. Cal Water operates as a regulated utility
subject to the jurisdiction of the CPUC. Its assets and operating revenues
comprise the majority of the Group's assets and operating revenues. It was
incorporated under the laws of the State of California on December 21, 1926, and
provides water service to approximately 383,000 residential, commercial and
industrial customers in 59 California cities and communities through 21 separate
water systems or districts. In the 20 regulated systems, which serve 377,000
customers, rates and operations are subject to the jurisdiction of the CPUC. An
additional 6,000 customers receive service through a long-term lease of the City
of Hawthorne water system, which is not subject to CPUC regulation. Cal Water
also has contracts with various municipalities and private entities to operate
water systems and provide billing.
 
     The second subsidiary, CWS Utility Services ("Utility Services"), performs
nonregulated water operations and related services. Existing nonregulated
contracts, currently performed by Cal Water, will be transferred to Utility
Services as the contracts are renewed or at such time as agreed upon between the
contracting parties. New nonregulated contracts will be conducted by Utility
Services.
 
     Group intends to continue exploring opportunities to expand operating and
other revenue sources in California and other western states. The opportunities
could include system acquisitions, water system leases, operating contracts,
billing contracts and other utility related services.
 
     Group's mailing address and principal executive offices are located at 1720
North First Street, San Jose, California 95112-4598; telephone number:
1-408-367-8200. Cal Water maintains a web site that can be accessed via the
Internet at http://www.calwater.com.
 
GROUP BOARD OF DIRECTORS, MANAGEMENT AND OPERATIONS AFTER THE MERGER
 
     The Group Board currently is comprised of nine directors. The Amended
Merger Agreement provides that as of the Effective Time, Group will add one of
the then current directors of Dominguez, to be identified immediately prior to
the Effective Time, to the Group Board.
 
     Dominguez will merge into Cal Water under the terms of the Amended Merger
Agreement with Cal Water as the Surviving Corporation. It is anticipated that
the Dominguez Subsidiaries will continue to be operated as Cal Water
subsidiaries. These operations will be managed by the management team of Group
and Cal Water after the Merger.
 
DIRECTORS OF GROUP
 
     The nine directors of the Group are elected annually. The term of office
for directors elected at the Group 1998 Annual Meeting will expire upon the
election of the new directors at the Group 1999 Annual Meeting.
 
                                       59
<PAGE>   68
 
     The following table sets forth the names and ages of all directors of Group
indicating the positions and offices presently held by each.
 
<TABLE>
<CAPTION>
                NAME                  AGE                 POSITION AND OFFICE
                ----                  ---                 -------------------
<S>                                   <C>   <C>
Robert W. Foy.......................  62    Director and Chairman of the Board
Edward D. Harris, Jr., M.D. ........  61    Director
Robert K. Jaedicke..................  70    Director
Richard P. Magnuson.................  43    Director
Linda R. Meier......................  58    Director
Peter C. Nelson.....................  51    Director, Chief Executive Officer and President
C.H. Stump..........................  73    Director
George A. Vera......................  55    Director
J.W. Weinhardt......................  67    Director
</TABLE>
 
     Mr. Foy (1) has been a director since 1977 and is Chairman of the Board of
Group and its two subsidiaries. He was formerly President and Chief Executive
Officer of Pacific Storage Company, a diversified transportation and warehousing
company serving Stockton, Modesto, Sacramento and San Jose. He has served as
chairman of Cal Water since 1996.
 
     Dr. Harris (1)(2) has been a director of Group since 1993 and is the George
DeForest Barnett professor of medicine at Stanford University Medical Center,
where he is the director of the Center for Musculoskeletal Diseases and the
medical director of the International Medicine Service. He is a director of the
Genentech Research and Educational Foundation.
 
     Professor Jaedicke (2)(3) has been a director of Group since 1974 and is
professor emeritus of accounting and former dean at the Stanford University
Graduate School of Business. Professor Jaedicke also is a director of Boise
Cascade Corporation, Enron Corp., GenCorp, Inc. and State Farm Insurance
Companies.
 
     Mr. Magnuson (3) has been a director of Group since 1996 and is a private
venture capitalist. From 1984 to 1996, he was a general partner of Menlo
Ventures, a venture capital firm. He also is a director of OrCAD, Inc., Rogue
Wave Software, Inc. and several other privately held companies.
 
     Ms. Meier (2)(3) has been a director of Group since 1994 and is a director
of Comerica Bank -- California, the Peninsula Community Foundation and the
National Advisory Board of the Haas Public Service Center. She also is a member
of the Board of Trustees of the California Academy of Sciences and the former
chair of the Stanford University Hospital Board of Directors (1992-1997).
 
     Mr. Nelson (1) has been a director of Group since 1996 and is president and
chief executive officer of Group and its two subsidiaries. Before joining Cal
Water in 1996, he was vice president, division operations (1994-1995), and
region vice president (1989-1994) of Pacific Gas & Electric Company.
 
     Mr. Stump (1)(3) has been a director of Group since 1976 and was Cal
Water's chairman of the board (1991-1996), president (1981-1991) and chief
executive officer (1986-1992).
 
     Mr. Vera (2) has been a director of Group since 1998 and is director of
finance and administration of the David and Lucile Packard Foundation. Until
1997, he was an audit partner with Arthur Andersen LLP.
 
     Mr. Weinhardt (1)(2) has been a director of Group since 1994 and is
chairman of the board and chief executive officer of SJW Corp. and chairman of
the board of its subsidiary San Jose Water Company, an investor-owned water
utility. He also is a director of SJW Land Company.
- ---------------
(1) Member of Executive Committee
 
(2) Member of Audit Committee
 
(3) Member of Compensation Committee
 
                                       60
<PAGE>   69
 
BOARD COMMITTEES OF GROUP
 
     Audit: Reviews Group's auditing, accounting, financial reporting and
internal audit functions. Also recommends the selection of independent auditors
to the Board. All members are non-employee directors.
 
     Compensation: Reviews Cal Water and Group's executive compensation and
employee benefit plans and programs, including their establishment, modification
and administration. All members are non-employee directors.
 
     Executive: Has limited powers to act on behalf of the Board whenever it is
not in session. This Committee meets only as needed.
 
     During 1997, there were 12 regular meetings of the Board, one meeting of
the Compensation Committee, two meetings of the Audit Committee and no meetings
of the Executive Committee. Each of the director-nominees who served on the
Board of Cal Water in 1997 attended at least 83 percent of all Board meetings.
Collectively, they attended an average of 87 percent of all of the Board and
applicable committee meetings.
 
EXECUTIVE OFFICERS OF GROUP
 
     The following are the executive officers of Group.
 
<TABLE>
<CAPTION>
               NAME                           POSITIONS AND OFFICES WITH GROUP                   AGE
               ----                           --------------------------------                   ---
<S>                                 <C>                                                          <C>
Robert W. Foy(1)                    A Director since 1977 and Chairman of Group and its          62
                                    subsidiaries since 1996. Formerly President and Chief
                                    Executive Officer of Pacific Storage Company,
                                    Stockton, Modesto, Sacramento and San Jose,
                                    California, a diversified transportation and
                                    warehousing company, where he had been employed for
                                    32 years.
Peter C. Nelson(1)                  Director and President and Chief Executive Officer           51
                                    since February 1, 1996. Formerly Vice President,
                                    Division Operations (1994-1995) and Region Vice
                                    President (1989-1994), Pacific Gas & Electric
                                    Company, a gas and electric public utility.
Gerald F. Feeney(1)                 Vice President, Chief Financial Officer and Treasurer        54
                                    since November 1994; Controller, Assistant Secretary
                                    and Assistant Treasurer from 1976 to 1994. From 1970
                                    to 1976, an audit manager with Peat Marwick Mitchell
                                    & Co.
Calvin L. Breed(2)                  Controller, Assistant Secretary and Assistant                43
                                    Treasurer since November 1994. Previously Treasurer
                                    of TCI International, Inc.; from 1980 to 1983, a
                                    certified public accountant with Arthur Andersen &
                                    Co.
Paul G. Ekstrom(1)                  Corporate Secretary since August 1996; Operations            46
                                    Coordinator, 1993 to 1996; District Manager,
                                    Livermore, 1988 to 1993; previously served in various
                                    field management positions since 1979; an employee
                                    since 1972.
</TABLE>
 
- ---------------
(1) holds the same position with Cal Water and Utility Services
 
(2) holds the same position with Cal Water
 
                                       61
<PAGE>   70
 
     The following are the executive officers of Cal Water.
 
<TABLE>
<CAPTION>
               NAME                         POSITIONS AND OFFICES WITH CAL WATER                 AGE
               ----                         ------------------------------------                 ---
<S>                                 <C>                                                          <C>
Francis S. Ferraro                  Vice President, Regulatory Matters since August 1989.        49
                                    Employed by the California Public Utilities
                                    Commission for 15 years, from 1985 through 1989, as
                                    an administrative law judge.
James L. Good(1)                    Vice President, Corporate Communications and                 35
                                    Marketing since January 1995. Previously Director of
                                    Congressional Relations for the National Association
                                    of Water Companies from 1991 to 1994.
Robert R. Guzzetta                  Vice President, Engineering and Water Quality since          45
                                    August 1996; Chief Engineer, 1990 to 1996; Assistant
                                    Chief Engineer, 1988 to 1990; various engineering
                                    department positions since 1977.
Christine L. McFarlane              Vice President, Human Resources since August 1996;           52
                                    Director of Human Resources, 1991 to 1996; Assistant
                                    Director of Personnel, 1989 to 1991; an employee
                                    since 1969.
Raymond H. Taylor                   Vice President, Operations since April 1995; Vice            53
                                    President and Director of Water Quality, 1990 to
                                    1995; Director of Water Quality, 1986 to 1990; prior
                                    to 1982 an employee of the United States
                                    Environmental Protection Agency.
Raymond L. Worrell                  Vice President, Chief Information Officer since              59
                                    August 1996; Director of Information Systems, 1991 to
                                    1996; Assistant Manager of Data Processing, 1970 to
                                    1991; Data Processing Supervisor, 1967 to 1970.
John S. Simpson                     Assistant Secretary, Manager of New Business since           54
                                    1991; Manager of New Business development for the
                                    past thirteen years; served in various management
                                    positions since 1967.
</TABLE>
 
- ---------------
(1) Also Vice President, Marketing with Utility Services.
 
     No officer or director has any family relationship to any other executive
officer or director. No executive officer is appointed for any set term. There
are no agreements or understandings between any executive officer and any other
person pursuant to which he was selected as an executive officer, other than
those with directors or officers of Group acting solely in their capacities as
such.
 
GROUP COMPENSATION OF NON-EMPLOYEE DIRECTORS
 
     Compensation. In 1998, Directors Harris, Jaedicke, Magnuson, Meier, Stump,
Vera and Weinhardt received an annual retainer of $15,000. Effective January 1,
1999 directors are paid an annual retainer of $16,000. Director Stump is paid an
annual consulting fee of $30,000 in addition to his annual retainer. Directors
are paid $850 for each Board or committee meeting attended. The committee chairs
are paid $1,700 for each committee meeting attended.
 
     Deferred Compensation Plan. Effective January 1, 1998, Group established a
Directors Deferred Compensation Plan, an unfunded deferred compensation program
for non-employee directors. This plan succeeded the California Water Service
Company Directors Deferred Compensation Plan. As under the predecessor plan,
participants may defer up to 100 percent of their annual retainer fees, with a
minimum annual contribution of $5,000. Amounts deferred are fully vested,
recorded by Group as general liabilities and adjusted as if invested in an
investment selected by the participant. Distribution is made at the earlier of
(1) the time selected by the participant (subject to a minimum length of
deferral), or (2) when the participant ceases to be a director (unless the
participant becomes an employee of Group, in which case, distribution will be
made upon termination of employment). Distributions also are available upon a
showing of hardship. Amounts remaining undistributed at death are distributed to
a designated beneficiary or benefi-
 
                                       62
<PAGE>   71
 
ciaries. Group is under no obligation to make any investment or otherwise fund
the plan. Participants are general, unsecured creditors of Group.
 
     Retirement Plan. Effective January 1, 1998, Group established a Directors
Retirement Plan to succeed the retirement plan of Cal Water. Group's plan
operates in the same manner as the prior Cal Water plan. Any director who
retires after serving on the Board for a total of five or more years (including
service on the Cal Water Board prior to January 1, 1998) will receive a benefit
equal to the annual retainer paid to Group's non-employee directors at the time
of the director's retirement. This benefit will be paid annually for the number
of years the director served on the Board, up to a maximum of 10 years.
 
                                       63
<PAGE>   72
 
                GROUP REINCORPORATION AS A DELAWARE CORPORATION
 
DESCRIPTION OF THE GROUP REINCORPORATION PROPOSAL
 
     The shareholders of Group, which is currently a California corporation,
will meet on April 21, 1999 to act on a proposal to reincorporate as a Delaware
corporation (the "Reincorporation Proposal"). If the Group shareholders approve
the Reincorporation Proposal, it is anticipated that it will be effected prior
to the Effective Time and that, accordingly, Dominguez Shareholders would become
shareholders of the Delaware corporate successor to Group ("Group-Delaware").
 
     Group's Common Stock is listed for trading on the NYSE under the symbol
"CWT." After the incorporation, Group-Delaware's common stock will continue to
be traded on the NYSE without interruption, under the same symbol. The Series C
Preferred Stock of Group described below in is thinly traded in the
"over-the-counter" market under the symbol "CWSGP." After the reincorporation,
Group-Delaware's Series C Preferred Stock will continue to be so traded on the
over-the-counter market, under the same symbol.
 
REASONS FOR THE PROPOSED REINCORPORATION
 
     The Group Board is recommending the Reincorporation Proposal to its
shareholders for several reasons. Generally, the Group Board believes that
incorporation in Delaware will improve the Group Board's ability to manage Group
for the benefit of Group's shareholders.
 
     Predictability of Delaware Law. Delaware has a modern statutory corporation
law and well-developed case law. It has courts specializing in corporate law.
These courts have developed expertise in dealing with corporate issues. Delaware
case law on corporate issues is the most comprehensive of any state. These
factors all provide the Board of Directors and management with greater certainty
in discharging their duties. The predictability of Delaware corporate law
provides a reliable foundation on which Group's governance decisions can be
based.
 
     Flexibility of Delaware Law. For many years, Delaware has followed a policy
of encouraging corporations to incorporate in that state. It has done so by
adopting and administering comprehensive and flexible corporate laws responsive
to the legal and business needs of corporations. Historically, Delaware's
legislature and courts have acted quickly and effectively to meet changing
business needs. The expertise of Delaware courts in dealing with new corporate
law issues and a changing business climate contributes to the orderly
development of Delaware corporate law.
 
     Prominence of Delaware Law. Among large companies, such as those listed on
the NYSE, Delaware is the most common state of incorporation. Many large
companies have reincorporated in Delaware as Group proposes to do. The
legislatures and courts of other states often look to Delaware law for guidance
on corporate law issues. The Group Board believes Group can best obtain the
benefits of Delaware law by reincorporating in that state and becoming directly
subject to its corporation laws.
 
     Increased Ability to Attract and Retain Qualified Directors. The Group
Board of Directors believes that a Delaware corporation has certain advantages
in attracting qualified candidates to act as directors and officers.
 
     - Both California and Delaware law permit a corporation to adopt charter
       provisions that reduce or limit the monetary liability of directors for
       breaches of their fiduciary duty in certain circumstances and provide for
       indemnification of directors and officers. The frequency of claims and
       litigation directed against directors and officers may discourage
       qualified persons from taking on these positions. Group believes that, in
       general, Delaware law provides greater protection to directors and
       officers than California law and that Delaware case law regarding a
       corporation's ability to limit director liability and provide
       indemnification is more developed and provides more guidance than
       California law.
 
     - With clearer corporation laws, directors and officers should be able to
       carry out their duties with more assurance that they are acting properly.
       A more developed and clearer corporation law should reduce
 
                                       64
<PAGE>   73
 
       the risk of liability and claims. Potential directors and officers can
       accept roles with Group with less concern for their own financial risk.
 
     To date, no person invited to become a director or officer of Group has
declined because it was a California corporation.
 
     Role of Directors and Shareholders. The Reincorporation Proposal includes
the elimination of the ability of shareholders to act by written consent without
a shareholder meeting. As a result, shareholders would be able to approve a
matter or take action only at a shareholder meeting. The Group Board believes
all shareholders should be given advance notice of and an opportunity to vote on
any matter that requires shareholder approval. Advance notice provides the Board
of Directors an opportunity to consider the proposed action and to communicate
its support or opposition to all shareholders. The Board of Directors believes
it should be given this opportunity on any matter requiring shareholder
approval. See "Antitakeover Implications."
 
     No Change in the Name, Board Members, Business, Management, Employee
Benefit Plans or Location of Principal Facilities of Group. The Proposed
Reincorporation will NOT result in any change in the name, business, management,
fiscal year, assets or liabilities or location of the facilities of Group. Group
should not suffer any disruption of its operations as a result of
reincorporating in Delaware.
 
ANTITAKEOVER IMPLICATIONS
 
     Like many other states, Delaware permits a corporation to adopt measures
designed to reduce a corporation's vulnerability to unsolicited takeover
attempts. Group now has in place the following measures that may serve defensive
purposes:
 
     - a shareholder rights plan;
 
     - a bylaw requiring advance written notice of director nominations or other
       proposals by shareholders; and
 
     - the authorization of preferred stock, the rights and preferences of which
       may be determined by the Group Board.
 
     The Reincorporation Proposal includes one additional measure that may serve
defensive purposes: the elimination of the right of shareholders to act by
written consent without a meeting.
 
     Group has considered but has not adopted other potentially defensive
measures, such as:
 
     - the establishment of a classified or staggered board of directors;
 
     - the elimination of cumulative voting;
 
     - the elimination of the right of holders of a specified percentage of
       shares to call a special shareholder meeting; and
 
     - the elimination of the right to remove a director other than for cause.
 
     In addition, in December 1998 the Group Board adopted severance
arrangements with executive officers as part of their compensation packages.
 
     Following the Proposed Reincorporation, Group-Delaware will keep in place
the shareholder rights plan, the requirement for advance notice of director
nominations and other shareholder proposals and the authorization of preferred
stock in the certificate of incorporation. For a discussion of the changes that
will result from the Proposed Reincorporation, see "Comparison of Shareholder
Rights" below.
 
     In addition to the elimination of the right of shareholders to act by
written consent without a meeting, the Reincorporation Proposal may have other
antitakeover implications. Section 203 of the Delaware General Corporation Law
("DGCL") restricts certain "business combinations" with certain "interested
stockholders" for three years following the date that a person becomes an
interested stockholder, unless the Board of Directors and two-thirds of the
remaining stockholders approve the business combination. A Delaware
 
                                       65
<PAGE>   74
 
corporation may elect not to be governed by this law, but Group-Delaware does
not intend to make such an election. See "Comparison of Shareholder Rights." At
present, Group has no 15% shareholders.
 
     The Group Board believes that unsolicited takeover attempts may be unfair
or disadvantageous to Group and its shareholders because, among other reasons:
 
     - an uninvited acquirer may time its takeover bid to take advantage of
       temporarily depressed stock prices;
 
     - an uninvited acquirer may design its bid to foreclose or minimize the
       possibility of more favorable competing bids or alternative transactions;
 
     - an uninvited acquirer may acquire only a controlling interest in the
       corporation's stock, without affording all shareholders the opportunity
       to receive the same economic benefits; and
 
     - a nonnegotiated acquisition of a controlling interest may put Group in
       default under certain contractual arrangements that prohibit a "change of
       control" of Group without the prior written consent of the other
       contracting party.
 
     Defensive measures encourage a potential bidder to negotiate with the Group
Board. Despite the Group Board's belief in its benefits to shareholders, the
Reincorporation Proposal may be disadvantageous. For example, Group Board might
not approve of a takeover attempt that a majority of shareholders may deem to be
in their best interests or in which shareholders may receive a substantial
premium over the then current market value for their shares. The Reincorporation
Proposal could discourage such an offer. As a result, Group shareholders who
might wish to participate in an unsolicited tender offer may not have an
opportunity to do so. In addition, to the extent that provisions of Delaware law
enable the Group Board to resist a takeover or a change in control of Group,
such provisions could make it more difficult for shareholders to change the
existing Group Board and management.
 
                                       66
<PAGE>   75
 
                        DESCRIPTION OF GROUP SECURITIES
 
GENERAL
 
     This section describes the securities of Group as incorporated under
California law. It is the intent of Group to seek Group shareholder approval of
the reincorporation of Group as a Delaware corporation. See "Reincorporation of
Group as a Delaware Corporation." If the Reincorporation Proposal is authorized
by the Group shareholders, it will be undertaken and completed in the second or
third quarter of 1999. At the date of this Proxy Statement -- Prospectus, the
reincorporation had not been approved by the Group shareholders or effected. It
is anticipated that the reincorporation will be approved by the Group
shareholders after the date of the Dominguez Special meeting and will be
effected prior to the Effective Time. If the reincorporation is effected,
Dominguez Shareholders will receive shares of the new Delaware corporation
rather than Group. For a comparison of Dominguez, Group and the anticipated
Group-Delaware shares, see "Comparison of Shareholder Rights." There can be no
assurances that the Group shareholders will approve the Reincorporation Proposal
or that it will be effected prior to the Effective Time. The discussion which
follows describes the securities of Group as a California corporation.
 
     Group is authorized to issue two classes of shares consisting of one class
of preferred shares and one class of common shares. The total number of shares
which Group is authorized to issue is 25,380,000 and the aggregate par value of
all of said shares that are to have a par value, namely all 380,000 of said
preferred shares is $9,500,000. Of said 25,380,000 shares, 25,000,000 shall be
and are Group Common Stock. Of said 380,000 preferred shares, 139,000 shall be
and are "Series C" preferred shares, 221,000 of said preferred shares shall be
and are preferred shares of "Series D" (none of which are currently issued or
outstanding) and 20,000 shares collectively of "Series E," "Series F," "Series
G," Series H," "Series I," and "Series J" (there being no preferred shares of
"Series A" or "Series B"), the number of shares constituting each such series to
be determined by the Group Board pursuant to the authority contained in the
Restated Articles of Incorporation of Group. The preferred shares may at the
election of the Board of Directors be issued in fractional shares if required in
connection with any stock split or otherwise. All of said 25,000,000 shares of
Group Common Stock shall be of one and the same series, namely common shares
without par value.
 
     The Group Board is authorized to fix or alter from time to time the number
of shares constituting any wholly unissued shares of preferred stock and to fix
or alter from time to time the dividend rights, dividend rate, exchange rights,
voting rights, rights and terms of redemption, redemption price or prices or the
liquidation preferences (including the absence or limited grant of any such
rights or preferences) of any wholly unissued series of preferred shares. Except
in so far as the Group Board shall provide in respect of any series, all
preferred shares shall be of equal rank, and any series of preferred shares
shall have the same rights and preferences as those granted to Series C
preferred shares.
 
     Except for any exchange rights which may be granted to any series of
preferred shares pursuant to the authority conferred upon the Group Board, no
one or more holders of shares of the capital stock of the Group shall be
entitled to purchase or otherwise participate in any new or additional issue of
stock by Group, and every Group stockholder has irrevocably for said stockholder
and said stockholder's heirs, executors, administrators, successors and assigns,
waived all rights to purchase or otherwise participate in such new or additional
issue or any part thereof except for said exchange rights.
 
     The holders of preferred shares of each series other than Series C shall be
entitled to, and Group is bound to pay thereon as and when declared by the Group
Board out of the surplus or net profits, dividends at such rate as shall be
fixed by the Group Board as provided in the Restated Articles of Incorporation.
Such dividends shall be payable upon the same date and in the same manner as
dividends upon Series C preferred shares. Dividends upon preferred shares of any
series shall be cumulative from the date of issuance in the same manner as
dividends upon Series C preferred shares.
 
     Preferred shares of each series other than Series C shall be subject to
redemption on any dividend date at the option of Group in whole or in part, at
such redemption price as may be fixed by the Group Board as provided in the
Restated Articles of Incorporation. Any such redemption shall be upon at least
thirty (30) days notice to the holders of record thereof which notice shall be
given in the same manner as in
 
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<PAGE>   76
 
the case of redemption of Series C preferred shares and all provisions herein
contained with respect to the redemption of Series C preferred shares, except
provisions as to redemption price, shall be applicable to the redemption of
preferred shares of any other series with appropriate changes in series
designations.
 
     The nature and extent of the preferences, privileges and restrictions
granted or imposed upon the holders of the respective classes or series of
shares and the number of shares constituting the Group Common Stock each series
of preferred shares are as follows:
 
COMMON SHARES
 
     The shares of Group Common Stock are listed on the NYSE. Application will
be made to list the shares of Group Common Stock issued in the Merger on the
NYSE.
 
     There were 12,619,140 Group Common Stock issued and outstanding as of
December 31, 1998.
 
     Holders of Group Common Stock are entitled to vote at all elections and to
vote or consent on all questions at the rate of one vote for each such share
held by such holder.
 
     Subject to the rights, privileges, preferences, restrictions and conditions
attaching to any other class or series of shares of Group, holders of Group
Common Stock have the right to receive any dividends declared and payable by
Group on Group Common Stock and the right to receive the remaining assets and
funds of Group upon liquidation, dissolution or winding-up, if any, after
payments to the holders of the "Series C" preferred shares, after the holders of
any other series of preferred shares which may be outstanding have received the
payments to which their respective preferences entitle them, and after payment
of all debts and liabilities of Group.
 
     Group Common Stock is subject and subordinate to any rights and preferences
granted under the Restated Articles of Incorporation of Group and any rights and
preferences which may be granted to any series of preferred shares by the Group
Board pursuant to the authority conferred upon the Group Board under the
Restated Articles of Incorporation of Group.
 
     After all cumulative dividends are declared and paid or set apart on the
preferred shares of Series C and on any other series of preferred shares which
may be outstanding, the Board of Directors may declare such additional dividends
on the Group Common Stock out of the surplus or net profits as in their
discretion may seem proper.
 
PREFERRED SHARES
 
     Series C Preferred Shares. The holders of the Series C preferred shares
will be entitled to and Group will be bound to pay thereon as and when declared
by the Board of Directors out of the surplus or net profits, dividends at the
rate of but not exceeding 4.4% per annum of the par value of each of such
shares, cumulative from the date of issuance and payable quarterly on the 15th
day of February, May, August and November in each year. If Group shall fail to
pay such dividends quarterly upon all the issued and outstanding preferred
shares of Series C, the deficiency in dividends shall be fully paid but without
interest before any dividends shall be set apart or paid on the Group Common
Stock.
 
     The preferred shares of Series C are subject to redemption on any dividend
date at the option of Group in whole or in part upon at least 30 days notice
mailed to the holders of record thereof at $26.75 per share together with
accrued dividends, and any such partial redemption shall be made by lot or pro
rata or by such other method as shall be provided from time to time by
resolution of the Group Board or by the Bylaws of Group, as amended.
 
     Upon any voluntary dissolution or liquidation of Group, the holders of the
Series C preferred shares shall be entitled to receive from capital or earnings
an amount equal to $26.75 per share, and all dividends accrued thereon to the
date of payment, and upon any involuntary dissolution or liquidation of Group
the holders of the Series C preferred shares shall be entitled to receive,
whether from capital or from earnings, an amount equal to the par value thereof
and all dividends accrued thereon to the date of payment, but no more before any
payment shall be made to the holders of the Group Common Stock.
 
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<PAGE>   77
 
     The preferred shares of Series C are non-assessable and entitled to no
Exchange rights whatsoever.
 
     The holders of preferred shares of Series C shall be entitled to vote at
all elections and to vote or consent on all questions at the rate of sixteen
votes for each share held by such holder.
 
     Series D Preferred Shares. On January 28, 1998, the Group Board adopted a
resolution (the "Resolution") designating 221,000 shares of Preferred Stock as
Series D Participating Preferred Stock. Such number of shares may be increased
or decreased by resolution of the Board of Directors prior to the issuance of
any Series D Preferred Stock.
 
     No shares of Series D Preferred Stock have been issued. These shares are
related to a Shareholder Rights Plan and would be issued if the rights plan were
triggered. If triggered, each right would be converted into the right to
purchase one one-hundredth of a share of the Series D Preferred Stock. For a
description of the rights, see "Preferred Share Purchase Rights/Rights
Agreement."
 
     Subject to the rights and the holders of any shares of any series of
Preferred Stock (or any similar stock) ranking prior and superior to the Series
D Preferred Stock with respect to dividends, the holders of shares of Series D
Preferred Stock, in preference to the holders of Group Common Stock and of any
other junior stock, shall be entitled to receive, as and when declared by the
Board of Directors out of the surplus or net profits, dividends payable in cash
on the same date as dividends upon Group's Series C (each such payment date
referred to herein as a "Dividend Payment Date") and in the same manner as
dividends upon Group's Series C, commencing on the first Dividend Payment Date
after the first issuance of a share or fraction of a share of Series D Preferred
Stock, in an amount per share (subject to the provision for adjustment
hereinafter set forth) equal to 100 times the aggregate per share amount
(payable in kind) of all non-cash dividends or other distributions, other than a
dividend payable in Group Common Stock (by reclassification or otherwise),
declared on the Group Common Stock since the immediately preceding Dividend
Payment Date or, with respect to the first Dividend Payment Date, since the
first issuance of any share or fraction of a share of Series D Preferred Stock.
If Group fails to pay any such dividends upon all the issued and outstanding
Series D Preferred Stock, the deficiency in dividends will be fully paid but
without interest before any dividends shall be set apart or paid on the Group
Common Stock. In the event Group shall at any time declare or pay any dividend
on the Group Common Stock payable in Group Common Stock, or effect a subdivision
or combination or consolidation of the outstanding Group Common Stock (by
reclassification or otherwise than by payment of a dividend in Group Common
Stock) into a greater or lesser number of Group Common Stock, then in each such
case the amount to which holders of shares of Series D Preferred Stock were
entitled immediately prior to such event under the preceding sentence shall be
adjusted by multiplying such amount by a fraction, the numerator of which is the
number of Group Common Stock outstanding immediately after such event and the
denominator of which is the number of shares of Group Common Stock that were
outstanding immediately prior to such event.
 
     Group shall declare a dividend or distribution on the Series D Preferred
Stock as provided in the preceding paragraph immediately after it declares a
dividend or distribution on the Group Common Stock (other than a dividend
payable in Group Common Stock).
 
     Subject to the provision for adjustment set forth below, each share of
Series D Preferred Stock shall entitle the holder thereof to 100 votes on all
matters submitted to a vote of the shareholders of Group. In the event Group
shall at any time declare or pay any dividend on the Group Common Stock payable
in Group Common Stock, or effect a subdivision or combination or consolidation
of the outstanding Group Common Stock (by reclassification or otherwise than by
payment of a dividend in Group Common Stock) into a greater or lesser number of
Group Common Stock, then in each such case the number of votes per share to
which holders of shares of Series D Preferred Stock were entitled immediately
prior to such an event shall be adjusted by multiplying such number by a
fraction, the numerator of which is the number of Group Common Stock outstanding
immediately after such event and the denominator of which is the number of
shares of Group Common Stock that were outstanding immediately prior to such
event.
 
     Except as otherwise provided in the Resolution, in any other Certificate of
Amendment to the Articles of Incorporation or Certificate of Determination
creating a series of Preferred Stock or any similar stock, or by
 
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<PAGE>   78
 
law, the holders of shares of Series D Preferred Stock and the holders of Group
Common Stock and any other capital stock of Group having general voting rights
shall vote together as one class on all matters submitted to a vote of
shareholders of Group.
 
     Except as set forth in the Resolution, or as otherwise provided by law,
holders of Series D Preferred Stock shall have no special voting rights and
their consent shall not be required (except to the extent they are entitled to
vote with holders of Group Common Stock as set forth in the Resolution) for
taking any corporate action.
 
     Whenever quarterly dividends or other dividends or distributions payable on
the Series D Preferred Stock as provided above are in arrears, thereafter and
until all accrued and unpaid dividends and distributions, whether or not
declared, on shares of Series D Preferred Stock outstanding shall have been paid
in full, Group shall not:
 
          (i) declare or pay dividends, or make any other distributions, on any
     shares of stock ranking junior (either as to dividends or upon liquidation,
     dissolution or winding up) to the Series D Preferred Stock;
 
          (ii) declare or pay dividends, or make any other distributions, on any
     shares of stock ranking on a parity (either as to dividends or upon
     liquidation, dissolution or winding up) with the Series D Preferred Stock,
     except dividends paid ratably on the Series D Preferred Stock and all such
     parity stock on which dividends are payable or in arrears in proportion to
     the total amounts to which the holders of all such shares are then
     entitled;
 
          (iii) redeem or purchase or otherwise acquire for consideration shares
     of any stock ranking junior (either as to dividends or upon liquidation,
     dissolution or winding up) to the Series D Preferred Stock, provided that
     Group may at any time redeem, purchase or otherwise acquire shares of any
     such junior stock in exchange for shares of any stock of Group ranking
     junior (either as to dividends or upon dissolution, liquidation or winding
     up) to the Series D Preferred Stock; or
 
          (iv) redeem or purchase or otherwise acquire for consideration any
     shares of Series D Preferred Stock, or any shares of stock ranking on a
     parity with the Series D Preferred Stock, except in accordance with a
     purchase offer made in writing or by publication (as determined by the
     Board of Directors) to all holders of such shares upon such terms as the
     Board of Directors, after consideration of the respective annual dividend
     rates and other relative rights and preferences of the respective series
     and classes, shall determine in good faith will result in fair and
     equitable treatment among the respective series or classes.
 
     Group shall not permit any subsidiary of Group to purchase or otherwise
acquire for consideration any shares of stock of Group unless Group could, under
the preceding paragraph (including subparagraphs (i) through (iv)), purchase or
otherwise acquire such shares at such time and in such manner.
 
     Any shares of Series D Preferred Stock purchased or otherwise acquired by
Group in any manner whatsoever shall be retired and canceled promptly after the
acquisition thereof. All such shares shall upon their cancellation become
authorized but unissued shares of Preferred Stock and may be reissued as part of
a new series of Preferred Stock subject to the conditions and restrictions on
issuance set forth herein, in the Restated Articles of Incorporation, or in any
other Certificate of Amendment to the Articles of Incorporation or Certificate
of Determination creating a series of Preferred Stock or any similar stock or as
otherwise required by law.
 
     Upon any liquidation, dissolution or winding up of Group, no distribution
shall be made (1) to the holders of shares of stock ranking junior (either as to
dividends or upon liquidation, dissolution or winding up) to the Series D
Preferred Stock unless, prior thereto, the holders of shares of Series D
Preferred Stock shall have received a minimum of $100.00 per share, plus an
amount equal to accrued and unpaid dividends and distributions thereon, whether
or not declared, to the date of such payment, provided that the holders of
shares of Series D Preferred Stock shall be entitled to receive an aggregate
amount per share, subject to the provision for adjustment hereinafter set forth,
equal to 100 times the aggregate amount to be distributed per share to holders
of Group Common Stock, or (2) to the holders of shares of stock ranking on a
parity (either as to dividends or upon liquidation, dissolution or winding up)
with the Series D Preferred Stock, except
 
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<PAGE>   79
 
distributions made ratably on the Series D Preferred Stock and all such parity
stock in proportion to the total amounts to which the holders of all such shares
are entitled upon such liquidation, dissolution or winding up. In the event
Group shall at any time declare or pay any dividend on the Group Common Stock
payable in Group Common Stock, or effect a subdivision or combination or
consolidation of the outstanding Group Common Stock (by reclassification or
otherwise than by payment of a dividend in Group Common Stock) into a greater or
lesser number of Group Common Stock, then in each such case the aggregate amount
to which holders of shares of Series D Preferred Stock were entitled immediately
prior to such event under the proviso in clause (1) of the preceding sentence
shall be adjusted by multiplying such amount by a fraction the numerator of
which is the number of Group Common Stock outstanding immediately after such
event and the denominator of which is the number of Group Common Stock that were
outstanding immediately prior to such event.
 
     If Group enters into any consolidation, merger, combination or other
transaction in which the Group Common Stock are exchanged for or changed into
other stock or securities, cash and/or any other property, then in any such case
each share of Series D Preferred Stock shall at the same time be similarly
exchanged or changed into an amount per share, subject to the provision for
adjustment set forth below, equal to 100 times the aggregate amount of stock,
securities, cash and/or any other property (payable in kind), as the case may
be, into which or for which each Common Share is changed or exchanged. In the
event Group shall at any time declare or pay any dividend on the Group Common
Stock payable in Group Common Stock, or effect a subdivision or combination or
consolidation of the outstanding Group Common Stock (by reclassification or
otherwise than by payment of a dividend in Group Common Stock into a greater or
lesser number of Group Common Stock), then in each such case the amount set
forth in the preceding sentence with respect to the exchange or change of shares
of Series D Preferred Stock shall be adjusted by multiplying such amount by a
fraction, the numerator of which is the number of Group Common Stock outstanding
immediately after such event and the denominator of which is the number of Group
Common Stock that were outstanding immediately prior to such event.
 
     The shares of Series D Preferred Stock may be redeemed at the option of
Group in whole or in part upon any dividend payment date and in the manner
prescribed in Group's Restated Articles of Incorporation, upon at least 30 days
notice to the holder of record thereof at a redemption price per share equal to
100 times the fair market value of a Common Share on such date, together with
all accrued dividends on the Series D Preferred Stock.
 
     The Series D Preferred Stock shall rank, (i) with respect to the payment of
dividends in parity with the Series C Preferred Stock and (ii) with respect to
the distribution of assets, junior to all other series of Group's Preferred
Stock.
 
     The Restated Articles of Incorporation of Group may not be amended in any
manner which would materially alter or change the powers, preferences or special
rights of the Series D Preferred Stock so as to affect them adversely without,
in addition to any other vote of shareholders required by law, the affirmative
vote of the holders of at least a majority of the outstanding shares of Series D
Preferred Stock, voting together as a single class.
 
     The Series D Preferred Stock may be issued in fractions of a share which
shall entitle the holder, in proportion to such holder's fractional shares, to
exercise voting rights, receive dividends, participate in distributions and to
have the benefit of all other rights of holders of the Series D Preferred Stock.
 
PREFERRED SHARE PURCHASE RIGHT/RIGHTS AGREEMENT
 
     On January 28, 1998, simultaneously with the resolution designating the
Series D Preferred Stock, the Group Board of Directors declared a dividend of
one preferred share purchase right (a "Right") for each outstanding share of
Group Common Stock. The dividend was payable on February 18, 1998 to
stockholders of record on February 6, 1998. Each Right entitles the registered
holder to purchase from Group one one-hundredth of a share of the Series D
Preferred Stock, no par value, of Group (hereinafter, the "Preferred Shares") at
a price of $120.00 per one one-hundredth of a Preferred Share (the "Purchase
Price"), subject to adjustment. The description and terms of the Rights are set
forth in a Rights Agreement (the "Rights
 
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<PAGE>   80
 
Agreement") between Group and Bank Boston, N.A., as Rights Agent (the "Rights
Agent"), dated as of February 12, 1998.
 
     Initially, the Rights will be attached to all certificates representing
Group Common Stock then outstanding, regardless of whether any such certificate
has a copy of a Summary of Rights attached thereto, and no separate Right
Certificates will be distributed. The Rights will separate from the Group Common
Stock and a "Distribution Date" will occur upon the earlier of (i) 10 days
following a public announcement that a person or group of affiliated or
associated persons (other than Group, any subsidiary of Group, any employee
benefit plan or dividend reinvestment plan of Group or of any subsidiary of
Group or any entity holding Group Common Stock for or pursuant to the terms of
any such employee benefit plan or as administrator of such dividend reinvestment
plan) have either acquired beneficial ownership of 15% or more of the
outstanding Group Common Stock, or have obtained beneficial ownership of 10% of
the outstanding Group Common Stock and been determined by the Group Board to
pose a threat of a material adverse impact on Group (either, an "Acquiring
Person") or (ii) 10 business days (or such later date as may be determined by
action of the Group Board prior to such time as any Person becomes an Acquiring
Person) following the commencement of, or announcement of an intention to make,
a tender offer or exchange offer the consummation of which would result in the
beneficial ownership by a person or group of 15% or more of such outstanding
Group Common Stock (unless Group has approved the offer).
 
     The Rights Agreement provides that, until the Distribution Date, the Rights
will be transferred with and only with the Group Common Stock. Until the
Distribution Date (or earlier redemption or expiration of the Rights), new
Common Share certificates issued after the Record Date upon transfer or new
issuance of Group Common Stock (including Group Common Stock issued to Dominguez
Shareholders in connection with the Merger) will contain a notation
incorporating the Rights Agreement by reference. Until the Distribution Date (or
earlier redemption or expiration of the Rights), the surrender for transfer of
any certificates for Group Common Stock outstanding as of the Record Date will
also constitute the transfer of the Rights associated with the Group Common
Stock represented by such certificate. As soon as practicable following the
Distribution Date, separate certificates evidencing the Rights ("Rights
Certificates") will be mailed to holders of record of the Group Common Stock as
of the close of business on the Distribution Date and such separate Rights
Certificates alone will evidence the Rights.
 
     The Rights are not exercisable until the Distribution Date. The Rights will
expire on February 11, 2008, unless earlier redeemed or exchanged by Group in
each case as described below. Until a Right is exercised, the holder thereof, as
such, will have no rights as a stockholder of Group, including, without
limitation, the right to vote or to receive dividends.
 
     The Purchase Price payable and the number of Preferred Shares or other
securities or property issuable upon exercise of the Rights are subject to
adjustment from time to time to prevent dilution (i) in the event of a stock
dividend on, or a subdivision, combination or reclassification of the Preferred
Shares, (ii) upon the grant to holders of the Preferred Shares of certain rights
or warrants to subscribe for Preferred Shares or convertible securities at less
than the current market price of the Preferred Shares or (iii) upon the
distribution to holders of the Preferred Shares of evidences of indebtedness or
assets (excluding regular periodic cash dividends out of earnings or retained
earnings or dividends payable in Preferred Shares) or of subscription rights or
warrants (other than those referred to above). The number of outstanding Rights
associated with each share of Group Common Stock is also subject to adjustment
in the event of a stock split of the Group Common Stock or a stock dividend on
the Group Common Stock payable in Group Common Stock or subdivisions,
consolidations or combinations of the Group Common Stock occurring, in any such
case, prior to the Distribution Date.
 
     With certain exceptions, no adjustment in the Purchase Price will be
required until cumulative adjustments require an adjustment of at least 1% in
such Purchase Price. No fractional Preferred or Group Common Stock will be
issued(other than fractions of Preferred Shares which are integral multiples of
one one-hundredth of a Preferred Share, which may, at the election of Group, be
evidenced by depositary receipts) and in lieu thereof, a payment in cash will be
made based on the market price of the Preferred or Group Common Stock on the
last trading date prior to the date of exercise.
 
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<PAGE>   81
 
     In the event that any person or group becomes an Acquiring Person (a
"Trigger Event"), each holder of a Right, other than the Acquiring Person (whose
Rights will thereafter be void), will thereafter have the right to receive upon
exercise at its then current exercise price that number of Group Common Stock
(or, in the event there are insufficient authorized Group Common Stock,
substitute consideration such as cash, property or other securities of Group,
such as Preferred Shares) having a market value of two times the Purchase Price
of the Right.
 
     In the event that, after a person or group has become an Acquiring Person,
Group is acquired in a merger or other business combination transaction or 50%
or more of its consolidated assets or earning power are sold, each holder of a
Right (other than an Acquiring Person, whose Rights will become void) will
thereafter have the right to receive, upon the exercise of the Right at its then
current exercise price, that number of shares of common stock of the acquiring
person having a market value of two times the exercise price of the Right.
 
     At any time until ten days following a Trigger Event, Group may redeem the
Rights in whole, but not in part, at a price of $.001 per Right (the "Redemption
Price"). Immediately upon the action of the Board of Directors ordering
redemption of the Rights, the right to exercise the Rights will terminate and
the only right of the holders of Rights will be to receive the Redemption Price.
 
     At any time after any person becomes an Acquiring Person, the Group Board
may, at its option, exchange all or part of the then-outstanding and exercisable
Rights (excluding Rights of an Acquiring Person that have become void) for Group
Common Stock at an exchange ratio of one share of Common Stock per Right,
appropriately adjusted to reflect any stock split, stock dividend or similar
transaction occurring after February 12, 1998. Notwithstanding the foregoing,
the Board of Directors shall not be empowered to effect such exchange at any
time after any Acquiring Person becomes the Beneficial Owner of 50% or more of
the Group Common Stock then outstanding. In lieu of Group Common Stock, the
Board of Directors may elect to substitute Preferred Shares for any such
exchange.
 
     For so long as the Rights are then redeemable, Group may amend the Rights
in any manner. After the Rights are no longer redeemable, Group may amend the
Rights in any manner that does not adversely affect the interests of holders of
the Rights.
 
     Preferred Shares purchased upon exercise of the Rights will not be
redeemable. Each Preferred Share will be entitled to an aggregate dividend of
100 times the dividend declared per share of Group Common Stock. In the event of
liquidation, the holders of the Preferred Shares will be entitled to a minimum
preferential liquidation payment of $100 per share but will be entitled to an
aggregate payment of 100 times the payment made per share of Group Common Stock.
Each Preferred Share will have 100 votes, voting together with the Group Common
Stock. Finally, in the event of any merger, consolidation or other transaction
in which Group Common Stock are exchanged, each Preferred Share will be entitled
to receive 100 times the amount received per share of Group Common Stock. These
rights are protected by customary antidilution provisions.
 
     Because of the nature of the Preferred Shares' dividend, liquidation and
voting rights, the value of the one one-hundredth of a Preferred Share
purchasable upon exercise of each Right should approximate the value of one
share of Group Common Stock.
 
     The Rights Agreement between Group and the Rights Agent specifying the
terms of the Rights, which includes as Exhibit B the form of Rights Certificate,
is incorporated herein by reference to Group's Form 8-K (File No. 333-22915)
filed with the SEC on February 13, 1998. The foregoing description of the Rights
is qualified in its entirety by reference to the Rights Agreement.
 
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<PAGE>   82
 
                        COMPARISON OF SHAREHOLDER RIGHTS
 
GENERAL
 
     The rights of holders of Dominguez Common Stock currently are governed by
the CGCL and Dominguez' Articles of Incorporation (the "Dominguez Articles") and
Bylaws (the "Dominguez Bylaws"). In accordance with the Amended Merger
Agreement, upon consummation of the Merger, the rights of Dominguez Shareholders
who become shareholders of Group pursuant to the Merger will be governed by the
Restated Articles of Incorporation (the "Group Articles") and Bylaws (the "Group
Bylaws") of Group, and by the law of the jurisdiction in which Group is then
organized. Group is currently organized under California law, but it is seeking
shareholder approval to reincorporate under the laws of Delaware. If this
reincorporation were to occur, then, following the Merger, the rights of
Dominguez Shareholders who become Shareholders of Group would be governed by the
DGCL. See "Reincorporation of Group as a Delaware Corporation." The following
summary sets forth the material differences between the current rights of
shareholders of Dominguez and shareholders of Group under California law, and
the rights of shareholders under Delaware law as anticipated under the
Reincorporation Proposal. The description of Group-Delaware's Certificate of
Incorporation and Bylaws which follows describes the proposed form of those
documents. At the time of preparation of these materials, Group-Delaware had not
been incorporated.
 
SIZE OF BOARD OF DIRECTORS
 
     Under the CGCL, the board of directors of a California corporation may fix
the number of directors within a stated range set forth in the corporation's
articles of incorporation or bylaws. The Dominguez Bylaws establish a range for
the number of authorized directors of from 7 to 9, and currently fix the
authorized number of directors at 9, with changes in the authorized number of
directors (within the current range) permitted by action of the board of
directors. A change in the range of authorized directors, or a change setting a
fixed number of directors without provision for a range, may be effected only by
the shareholders. The Group Bylaws currently establish a range for the number of
authorized directors from 9 to 11, and currently fix the authorized number of
directors at 9, with changes in the authorized number of directors (within the
current range) permitted by action of the board of directors or the
shareholders. A change in the range of authorized directors, or a change setting
a fixed number of directors without provision for a range, may be effected only
by shareholder vote.
 
     The DGCL permits the board of directors of a Delaware corporation to change
the authorized number of directors by amendment to the corporation's bylaws (or
in the manner provided in the bylaws), unless the number of directors is fixed
in the corporation's certificate of incorporation. If so fixed, a change in the
number of directors may be made only by amendment to the certificate of
incorporation, which requires stockholder approval.
 
     The proposed bylaws of Group-Delaware, the shares into which Dominguez
Common Stock would be converted upon consummation of the Merger (if the
Reincorporation Proposal is effected prior to that date), fixes the number of
directors at 9; there is no provision in the Group-Delaware certificate of
incorporation regarding the number of directors of Group-Delaware and,
accordingly, the number of directors may be changed by the board of directors
without shareholder approval. If the reincorporation is completed prior to the
Effective Time, the Group Board intends to fix the number of directors of
Group-Delaware at ten, in compliance with the terms of the Amended Merger
Agreement. At the time of preparation of this Proxy Statement-Prospectus,
Group-Delaware had not been incorporated in Delaware and the form of its
certificate of incorporation and bylaws described herein for Group-Delaware are
the proposed form of such documents.
 
CLASSIFICATION OF BOARD OF DIRECTORS
 
     A classified board is one in which a certain number, but not all, of the
directors are elected on a rotating basis each year. This method of electing
directors makes a change in the composition of the board of directors, and a
potential change in control of a corporation, a lengthier and more difficult
process.
 
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<PAGE>   83
 
     The CGCL permits a classified board of directors for corporations with
outstanding shares listed on a national stock exchange, including Nasdaq. The
Dominguez Articles, however, do not permit a classified board. Likewise, Group
does not have a classified board. The DGCL also permits a classified board of
directors, with staggered terms under which the directors are elected for terms
of two or three years. Neither the proposed certificate of incorporation nor the
bylaws of Group-Delaware provide for a classified board.
 
REMOVAL OF DIRECTORS
 
     Under the CGCL, any director may be removed with cause by the board of
directors, and without cause with the approval of a majority of the outstanding
shares entitled to vote; however, no director may be removed without cause
(unless the entire board is removed) if the number of shares voted against the
removal would be sufficient to elect the director under cumulative voting. See
"Cumulative Voting" below.
 
     Under the DGCL, any director or the entire board of directors of a Delaware
corporation with a classified board of directors may only be removed for cause,
unless the certificate of incorporation provides otherwise. In the case of a
Delaware corporation without a classified board, any director or the entire
board may be removed, with or without cause, by the holders of a majority of
shares then entitled to vote at an election of directors; provided that, if the
corporation has cumulative voting, if less than the entire board is to be
removed, no director may be removed without cause if the votes cast against his
removal would be sufficient to elect him if then cumulatively voted at an
election of the entire board.
 
FILLING VACANCIES ON THE BOARD OF DIRECTORS
 
     Under the CGCL, any vacancy on the board of directors other than one
created by removal of a director may be filled by the board of directors. If the
number of directors then in office is less than a quorum, a vacancy may be
filled by the unanimous written consent of the directors then in office, by the
affirmative vote of a majority of such directors at a meeting held pursuant to
notice or waivers of notice, or by a sole remaining director. A vacancy created
by removal of a director may be filled by the board of directors only if so
authorized by a corporation's articles of incorporation or by a bylaw approved
by the corporation's shareholders. Dominguez' Bylaws do not authorize its board
to fill a vacancy created by removal of a director. Group's Bylaws currently do
not authorize its board to fill a vacancy created by removal of a director.
 
     Under the DGCL, vacancies on the board of directors and newly created
directorships may be filled by a majority of the directors then in office (even
though less than a quorum) unless (i) otherwise provided in the certificate of
incorporation or bylaws of the corporation or (ii) the certificate of
incorporation directs that a particular class of outstanding stock is to elect
such director, in which case any other directors elected by such class, or a
sole remaining director, may fill such vacancy. Group-Delaware's proposed
certificate of incorporation and bylaws do not permit the directors to fill
vacancies on the board.
 
LIMITATIONS OF LIABILITY OF DIRECTORS; INDEMNIFICATION
 
     Limitations on Director Liability. Both Delaware and California permit a
corporation to limit or eliminate the personal liability of a director to the
corporation or its shareholders or stockholders, as applicable, for monetary
damages for breach of certain duties as a director, but only if limiting
language is included in the charter documents.
 
     The CGCL permits the elimination of monetary liability of a director for
breach of duties to the corporation and its shareholders, except where such
liability is based on (a) intentional misconduct or knowing and culpable
violation of law; (b) acts or omissions that a director believes to be contrary
to the best interests of the corporation or its shareholders, or that involve
the absence of good faith on the part of the director; (c) receipt of an
improper personal benefit; (d) acts or omissions that show reckless disregard
for the director's duty to the corporation or its shareholders, where the
director in the ordinary course of performing his or her duties should be aware
of a risk of serious injury to the corporation or its shareholders; (e) acts or
omissions that constitute an unexcused pattern of inattention that amounts to an
abdication of the director's duty to the corporation and its shareholders; (f)
interested transactions between the corporation and a director in which a
director has a material financial interest; or (g) liability for improper
distributions, loans or
 
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<PAGE>   84
 
guarantees. The Dominguez Articles provide that the liability of Dominguez
directors for monetary damages shall be eliminated to the fullest extent
permissible under California law. The Group Articles currently provide that the
liability of Group directors for monetary damages shall be eliminated to the
fullest extent permissible under California law.
 
     Under the DGCL, a limitation-of-liability provision may not eliminate or
limit director monetary liability for: (a) breaches of the director's duty of
loyalty to the corporation or its stockholders; (b) acts or omissions not in
good faith or involving intentional misconduct or knowing violations of law; (c)
the payment of unlawful dividends or unlawful stock repurchases or redemptions;
or (d) transactions in which the director received an improper personal benefit.
In addition, a limitation-of-liability provision may not relieve directors from
the obligation to comply with any laws, or from the availability of non monetary
remedies such as injunctive relief or rescission.
 
     The Group-Delaware proposed certificate of incorporation would eliminate
the liability of directors to the corporation or its stockholders for monetary
damages for breach of fiduciary duty as a director to the fullest extent
permissible under Delaware law, as such law exists currently and as it may be
amended in the future. Under Delaware law, this provision will not eliminate or
limit liability for (a) breaches of the director's duty of loyalty to the
corporation or its stockholders; (b) acts or omissions not in good faith or
involving intentional misconduct or knowing violations of law; (c) the payment
of unlawful dividends or unlawful stock repurchases or redemptions; (d)
transactions in which the director received an improper personal benefit; or (e)
violation of federal or state securities laws.
 
     The circumstances in which directors may be free of liability for their
actions are arguably broader in Delaware than in California. California
expressly prohibits elimination of liability when the facts show a "reckless
disregard for the director's duty" or "an unexcused pattern of inattention that
amounts to an abdication of the director's duty." Depending on the facts of a
particular case, Delaware law might excuse a director for actions falling in
these categories. See "Reincorporation of Group as a Delaware Corporation."
 
     Indemnification of Officers and Directors. Delaware and California have
similar laws regarding indemnification by a corporation of its officers,
directors, employees and other agents. There are, nonetheless, certain
differences between the laws of the two states.
 
     Indemnification is generally permitted by both the DGCL and CGCL provided
that the requisite standard of conduct is met, as determined by a majority vote
of a disinterested quorum of the directors, independent legal counsel (if a
quorum of independent directors is not obtainable), a majority vote of a quorum
of the shareholders (excluding shares owned by the indemnified party) or the
court handling the action.
 
     The CGCL requires indemnification when the individual has successfully
defended the action on the merits. The DGCL requires indemnification when the
individual has been successful in the defense on the merits or otherwise.
 
     The DGCL generally permits indemnification of expenses incurred in the
defense or settlement of a derivative or third-party action, provided there is a
determination that the person seeking indemnification acted in good faith and in
a manner reasonably believed to be in or (in contrast to California law) not
opposed to the best interests of the corporation and, with respect to criminal
actions, had no reasonable cause to believe the conduct was unlawful. Without
court approval, however, no indemnification may be made in respect of any
derivative action in which such person is adjudged liable for negligence or
misconduct in the performance of his or her duty to the corporation.
 
     The CGCL permits indemnification of expenses incurred in derivative or
third-party actions, except that with respect to derivative actions no
indemnification may be made without court approval (a) when a person is adjudged
liable to the corporation in the performance of that person's duty to the
corporation and its shareholders, unless a court determines such person is
entitled to indemnity for expenses, and then such indemnification may be made
only to the extent that such court shall determine, or (b) in respect of amounts
paid or expenses incurred in settling or otherwise disposing of a threatened or
pending action or amounts
 
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<PAGE>   85
 
incurred in defending a pending action which is settled or otherwise disposed of
without court approval. Delaware allows indemnification of such expenses without
court approval.
 
     California law allow corporations to provide indemnification over and above
what is required or expressly permitted, if authorized by the articles of
incorporation.
 
     Under the Dominguez Articles, Dominguez may provide indemnification to
"agents" (as defined under Section 317 of the CGCL) through bylaw provisions,
agreements, vote of shareholders or disinterested directors, or otherwise, which
is broader than currently available under the CGCL. The Group Articles also
permit indemnification beyond that expressly mandated by California law and
limit director monetary liability to the extent permitted by California law.
 
     Delaware law also permits a Delaware corporation to provide indemnification
in excess of that provided by statute. By contrast to California law, however,
Delaware law does not require authorizing provisions in the certificate of
incorporation and does not contain express prohibitions on indemnification in
certain circumstances. Limitations on indemnification may be imposed by a court,
however, based on principles of public policy.
 
ANNUAL MEETINGS
 
     The Dominguez Bylaws require that an annual meeting of shareholders be held
the first Thursday of May in each year at 1:00 p.m., or at such other time
and/or date as shall be designated from time to time by the Board of Directors.
The Group Bylaws require that an annual meeting of shareholders be held at such
time or such date in the month of April as shall be designated from time to time
by the Board of Directors. The bylaws of Group-Delaware would contain the same
provision as the Group Bylaws.
 
SPECIAL SHAREHOLDER MEETINGS
 
     Under the CGCL, a special meeting of shareholders may be called by the
board of directors, the chairman of the board, the president, the holders of
shares entitled to cast not less then 10% of the votes at such meeting, and such
other persons as are authorized to do so in the articles of incorporation or
bylaws. Neither the Dominguez Articles or Dominguez Bylaws authorize any such
other persons to call a special meeting. Neither the Group Articles nor the
Group Bylaws authorize any such other persons to call a special meeting.
 
     Under the DGCL, a special meeting of stockholders may be called by the
board of directors or any other person authorized to do so in the corporation's
certificate of incorporation or bylaws. Neither the Group-Delaware proposed
certificate of incorporation or bylaws authorize any such other persons to call
a special meeting.
 
ACTIONS BY WRITTEN CONSENT OF SHAREHOLDERS
 
     Under the CGCL, unless otherwise provided in the articles of incorporation,
any action which may be taken at any annual or special meeting of shareholders
may be taken without a meeting by written consent of shareholders having the
requisite number of votes, subject to the requirement that ten days' advance
notice of shareholder approval be given where all shareholders' consents are not
solicited. In addition, directors may be elected by written consent only if that
consent is unanimous. The Dominguez Articles do not limit the rights of
shareholders to act by written consent. The Group Articles currently do not
prohibit action by written consent of the shareholders without a meeting.
 
     The DGCL permits the shareholders to act by written consent in lieu of a
meeting of stockholders, unless a corporation eliminates action by written
consent in its certificate of incorporation. The proposed certificate of
incorporation of Group-Delaware would eliminate such right of the shareholders
and would prohibit stockholders from taking action by written consent without a
meeting.
 
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<PAGE>   86
 
ADVANCE NOTICE REQUIREMENT FOR SHAREHOLDER PROPOSAL AND DIRECTOR NOMINATIONS
 
     Dominguez' Bylaws provide that no director nomination and no matter
proposed by Dominguez Shareholders will be considered at an annual meeting of
shareholders unless written notice is given to Dominguez not less than 60 and
not more than 90 days before the meeting. In addition, if not less than 70 days
prior notice or public disclosure of the meeting is given or made to Dominguez
Shareholders, certain additional restrictions apply.
 
     The bylaws of Group-Delaware include an advance notice procedure for the
nomination, other than by the Group Board, of candidates for election as
directors and for shareholder proposals to be brought before a shareholder
meeting. Group adopted a similar procedure in 1998.
 
VOTING REQUIREMENTS; SUPER MAJORITY APPROVAL
 
     Unless otherwise specified in a California corporation's articles of
incorporation, an amendment to the articles of incorporation requires the
affirmative vote of a majority of the outstanding shares entitled to vote
thereon. Under the CGCL, the holders of the outstanding shares of a class are
entitled to vote as a class if the proposed amendment would (i) increase or
decrease the aggregate number of authorized shares of such class, (ii) effect an
exchange, reclassification, or cancellation of all or part of the shares of such
class, other than a stock split, (iii) effect an exchange, or create a right of
exchange, of all or part of the shares of another class into the shares of such
class, (iv) change the rights, preferences, privileges, or restrictions of the
shares of such class, (v) create a new class of shares having rights,
preferences, or privileges prior to the shares of such class, or increase the
rights, preferences, or privileges or the number of authorized shares having
rights, preferences, or privileges prior to the shares of such class, (vi) in
the case of preferred shares, divide the shares of any class into series having
different rights, preferences, privileges, or restrictions or authorize the
board of directors to do so, or (vii) cancel or otherwise affect dividends on
the shares of such class which have accrued but have not been paid.
 
     Unless otherwise specified in a Delaware corporation's certificate of
incorporation, an amendment to the certificate of incorporation requires the
affirmative vote of a majority of the outstanding stock entitled to vote
thereon. Furthermore, under the DGCL, the holders of the outstanding shares of a
class are entitled to vote as a class upon any proposed amendment to the
certificate of incorporation, whether or not entitled to vote thereon by the
provisions of the corporation's certificate of incorporation, if the amendment
would increase or decrease the aggregate number of authorized shares of such
class, increase or decrease the par value of the shares of such class, or alter
or change the powers, preferences, or special rights of the shares of such class
so as to adversely affect them.
 
     Under both the DGCL and the CGCL, with certain exceptions, any merger,
consolidation, or sale of all or substantially all of a corporation's assets
must be approved by the corporation's board of directors and a majority of the
outstanding shares entitled to vote. In addition, the CGCL, but not the DGCL,
requires such transactions, among others, to be approved by a majority of the
outstanding shares of each class of stock (without regard to limitations on
voting rights).
 
     The Dominguez Articles also provide that certain transactions, including
the merger or consolidation of the Company or the sale of substantially all of
its assets, require the affirmative vote of the holders of at least two-thirds
of the total number of Class A preferred shares outstanding. Also, each share of
Class A preferred stock entitles its holder to three votes. Although the
Dominguez Articles authorize the issuance by Dominguez of 30,000 shares of Class
A preferred shares, currently there are no such shares issued and outstanding.
The Group Articles provide that each share of Series C preferred stock entitles
its holder to 16 votes at all elections of directors as well as other matters.
The Group Articles authorize the issuance by Group of 139,000 shares of Series C
preferred shares, and currently there are 139,000 such shares issued and
outstanding. Group has also designated 221,000 shares of Series D preferred
shares, none of which are issued or outstanding.
 
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<PAGE>   87
 
AMENDING THE BYLAWS
 
     Under the CGCL, a corporation's bylaws may be adopted, amended or repealed
either by the board of directors or the shareholders of the corporation,
provided that only the shareholders may adopt a change to a fixed number of
directors or to alter an established range. Dominguez' Bylaws provide that the
Bylaws may be changed either by the vote of the holders of a majority of the
outstanding shares entitled to vote or by the board of directors; provided,
however, that the Dominguez Board may not amend the Bylaws in order to change a
fixed number of directors (except to alter the authorized number of directors
within the existing range of a minimum of 7 and a maximum of 9 directors).
Group's Bylaws provide that the Bylaws may be changed either by the vote of the
holders of a majority of the outstanding shares entitled to vote or by the board
of directors; provided, however, that an amendment to the Bylaws in order to
change the authorized number of directors may only be effected by a vote of the
Group shareholders.
 
     Under the DGCL, the authority to adopt, amend, or repeal the bylaws of a
Delaware corporation is held exclusively by the stockholders unless such
authority is conferred upon the board of directors in the corporation's
certificate of incorporation. The certificate of incorporation of Group-Delaware
will confer upon the board of directors the authority to adopt, amend or repeal
its Bylaws.
 
CUMULATIVE VOTING
 
     In an election of directors under cumulative voting, each share of stock
normally having one vote is entitled to a number of votes equal to the number of
directors to be elected. A shareholder may cast all such votes for a single
candidate or may allocate then among as many candidates as such shareholder may
choose. Without cumulative voting, the holders of a majority of the shares
present at an annual meeting or any special meeting held to elect directors
would have the power to elect all the directors to be elected at that meeting,
and no person could be elected without the support of holders of a majority of
the shares voting at such meeting.
 
     Under the CGCL, there is a right to cumulate votes if at least one
shareholder has given notice of such shareholder's intent to cumulate his or her
votes at the meeting prior to the voting, provided that the corporation's
articles or bylaws do not specifically eliminate this right. This right may be
eliminated if the corporation has outstanding shares listed on a national stock
exchange, including the Nasdaq. Neither Dominquez' Articles nor Bylaws eliminate
this right. Group's Articles and Bylaws do not eliminate cumulative voting and
the proposed certificate of incorporation and bylaws of Group-Delaware
specifically allow for cumulative voting.
 
     Under the DGCL, there is no right to cumulative voting unless the charter
documents specifically provide for it.
 
"BLANK CHECK" PREFERRED STOCK
 
     A corporation's articles may authorize its board to provide for the
issuance of one or more series of preferred stock without stockholder approval,
and to establish the relative designation, rights, preferences and privileges of
such preferred shares. Any such stock is called "blank check" preferred stock.
The Dominguez Articles authorize the Dominguez Board to determine the rights,
preferences and privileges and the qualifications, limitations or restrictions
of the authorized but unissued shares of preferred stock of Dominguez. The Group
Articles also authorize the Group board to determine the rights, preferences and
privileges and the qualifications, limitations or restrictions of the authorized
but unissued shares of preferred stock of Group. The proposed certificate of
incorporation of Group-Delaware contains provisions granting the same
authorization to the Group-Delaware board of directors.
 
BUSINESS COMBINATIONS/REORGANIZATIONS
 
     The CGCL provides that, except where the fairness of the terms and
conditions of the transaction has been approved by the California Commissioner
of Corporations and except in a "short-form" merger (the merger of a parent
corporation with a subsidiary in which the parent owns at least 90% of the
outstanding
 
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<PAGE>   88
 
shares of each class of the subsidiary's stock), if the surviving corporation or
its parent corporation owns, directly or indirectly, shares of the target
corporation representing more than 50% of the voting power of the target
corporation prior to the merger, the nonredeemable common stock of a target
corporation may be converted only into nonredeemable common stock of the
surviving corporation or its parent corporation, unless all of the shareholders
of the class consent. The effect of this provision is to prohibit a cash-out
merger of minority shareholders, except where the majority shareholder already
owns 90% or more of the voting power of the target corporation and could,
therefore, effect a short-form merger to accomplish such a cash-out of minority
shareholders.
 
     In addition, the CGCL requires that, in connection with certain
transactions between a corporation whose shares are held of record by 100 or
more persons and an "interested party," such interested party must deliver a
written opinion as to the fairness of the consideration to the shareholders of
the corporation. An "interested party" for purposes of this CGCL provision means
a person who is a party to the transaction and (i) directly or indirectly
controls the corporation, (ii) is an officer or director of the corporation, or
(iii) is an entity in which a material financial interest is held by any
director or executive officer of the corporation.
 
     A provision of the DGCL prohibits certain business combinations between a
Delaware corporation and an "interested stockholder." For purposes of this DGCL
provision, an "interested stockholder" is a stockholder that is directly or
indirectly a beneficial owner of 15% or more of the voting power of the
outstanding voting stock of a Delaware corporation (or its affiliate or
associate). This provision prohibits certain business combinations between an
interested stockholder and a corporation for a period of three years after the
date the interested stockholder acquired its stock, unless (i) prior to the date
the stockholder became an interested stockholder the business combination or the
transaction which resulted in the stockholder becoming an interested stockholder
is approved by the corporation's board of directors; (ii) the interested
stockholder acquired at least 85% of the voting stock of the corporation in the
transaction in which it became an interested stockholder; or (iii) the business
combination is approved by a majority of the board of directors and the
affirmative vote of two-thirds of the shares held by disinterested stockholders.
 
     Also, see "Voting Requirements; Super Majority Approval" regarding certain
Class A preferred stock voting rights with respect to mergers, combinations or
the sale of substantially all assets by Dominguez. Neither Group's Articles nor
the proposed certificate of incorporation of Group-Delaware grant any super-
majority preferred stock approval rights in the case of a merger, combination or
sale of assets by Group or Group-Delaware.
 
RIGHTS OF DISSENTING SHAREHOLDERS
 
     Under both the DGCL and the CGCL, a shareholder of a corporation
participating in certain mergers and reorganizations may be entitled to receive
cash in the amount of the "fair value" (Delaware) or "fair market value"
(California) of its shares, as determined by a court, in lieu of the
consideration it would otherwise receive in the transaction. In general,
shareholders of a California corporation have broader dissenters' rights than
stockholders of a Delaware corporation.
 
     Under Delaware law, dissenters' rights are not available to stockholders
with respect to a merger or consolidation by a corporation, the shares of which
are either listed on a national securities exchange or designated as a national
market system security or an interdealer quotation system security by the
National Association of Securities Dealers, Inc., or are held of record by more
than 2,000 holders, if the shareholders receive shares of the surviving
corporation or shares of any other corporation which are similarly listed or
dispersed, and the shareholders do not receive any other property in exchange
for their shares except cash for fractional shares. Dissenters' rights are also
unavailable under Delaware law to shareholders of a corporation surviving a
merger if no vote of those shareholders is required to approve the merger
because, among other things, the number of shares to be issued in the merger
does not exceed 20% of the shares of the surviving corporation outstanding
immediately before the merger, and certain other conditions are met.
 
     Shareholders of a California corporation, the shares of which are listed on
a national securities exchange or on the OTC margin stock list, generally do not
have dissenters' rights unless the holders of at least 5% of the class of
outstanding shares assert dissenters' rights. In any reorganization in which one
corporation or the
 
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<PAGE>   89
 
shareholders of one corporation will own immediately after the reorganization
more than 5/6 of the voting power of the surviving or acquiring corporation or
its parent, shareholders of such corporations are denied dissenters' rights
under California law.
 
     Delaware law does not provide parent company stockholders with voting or
dissenters' rights when it acquires another business through the issuance of its
stock or by purchase of assets or stock or by merger of the company being
acquired with a subsidiary of the acquirer. However, the corporate governance
rules of the major stock exchanges and the Nasdaq require in general that
acquisitions involving the issuance of stock having 20% or more of the voting
power outstanding must be submitted for shareholder approval. The CGCL treats
these kinds of acquisitions in the same manner as a merger of the issuer
corporation directly with the business to be acquired, and provides dissenters'
rights in the circumstances described in the preceding paragraph.
 
INSPECTION OF STOCKHOLDERS LIST
 
     Both the DGCL and the CGCL allow any stockholder to inspect the
stockholders list for a purpose reasonably related to such person's interest as
a stockholder. Additionally, the CGCL provides for an absolute right to inspect
and copy the corporation's shareholder list by a person or persons holding at
least 5% in the aggregate of the corporation's outstanding voting shares, or any
shareholder or shareholders holding 1% or more of such shares who have filed a
Schedule 14B with the Commission relating to the election of directors. The DGCL
does not provide for any such absolute right of inspection.
 
DIVIDENDS
 
     Under the CGCL, any dividends or other distributions to shareholders, such
as redemptions, are limited to the greater of (i) retained earnings or (ii) an
amount which would leave the corporation with assets (excluding certain
intangible assets) equal to at least 125% of its liabilities (excluding certain
deferred items) and current assets equal to at least 100% (or, in certain
circumstances, 125%) of its current liabilities. The DGCL allows the payment of
dividends and redemption of stock out of surplus (including paid-in and earned
surplus) or out of net profits for the current and immediately preceding fiscal
years.
 
SHAREHOLDER DERIVATIVE SUITS
 
     The CGCL provides that a shareholder bringing a derivative action on behalf
of the corporation need not have been a shareholder at the time of the
transaction in question, provided that certain tests are met. The CGCL also
provides that the corporation or the defendant in a derivative suit may make a
motion to the court for an order requiring the plaintiff shareholder to furnish
a security bond. Under the DGCL, a stockholder may only bring a derivative
action on behalf of the corporation if the stockholder was a stockholder of the
corporation at the time of the transaction in question or the stock thereafter
devolved upon the stockholder by operation of law. The CGCL also provides that
the corporation or the defendant in a derivative suit may make a motion to the
court for an order requiring the plaintiff shareholder to furnish a security
bond. The DGCL does not have a similar bonding requirement.
 
PREEMPTIVE RIGHTS
 
     Shareholders of either a Delaware or a California corporation have only
such preemptive rights as may be provided in its certificate or articles of
incorporation. The Dominguez Articles do not grant any preemptive rights to
shareholders. Neither the current Group Articles nor the proposed certificate of
incorporation of Group-Delaware grant any preemptive rights to shareholders.
 
DISSOLUTION
 
     Under California law, shareholders holding 50% or more of the total voting
power may authorize a corporation's dissolution, with or without the approval of
the corporation's board of directors. The articles of incorporation may not
modify this right. Under Delaware law, if the board of directors has not
approved the proposal to dissolve, the dissolution must be unanimously approved
by all the stockholders entitled to vote. If the board of directors initially
approves the dissolution, approval by a simple majority of the outstanding
shares
 
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<PAGE>   90
 
of the corporation's stock is sufficient. In the event of such a board-initiated
dissolution, Delaware law allows a Delaware corporation to include in its
certificate of incorporation a supermajority voting requirement for dissolution.
It is not anticipated that Group-Delaware's certificate of incorporation will
include a supermajority voting requirement for dissolution.
 
BOARD OF DIRECTORS MEETINGS
 
     Under the CGCL, meetings of the board of directors of a California
corporation, unless otherwise provided in such corporation's articles of
incorporation or bylaws, may be called by the chairman of the board, the
president, any vice president, the secretary or any two directors. Neither the
Dominguez Articles nor the Dominguez Bylaws provide otherwise. The Dominguez
Bylaws provide that a regular meeting of the board of directors may be held
without notice if the times and dates for such meetings are fixed by the board.
The current Group Bylaws provide that a regular meeting of the board of
directors may be held without notice if the times and dates for such meetings
are fixed by resolutions of the board.
 
     The DGCL imposes no requirements as to calling board of directors meetings;
such requirements are as set forth in a Delaware corporation's certificate of
incorporation or bylaws. The proposed certificate of incorporation and bylaws of
Group-Delaware will contain provisions to the same effect as the current Group
Bylaws.
 
DIRECTOR VOTING
 
     Under the CGCL, a quorum is equal to a majority of the authorized number of
such corporation's directors unless such corporation's articles of incorporation
or bylaws provide for a lesser number; provided, however, that such lesser
number cannot be less than the larger of (i) one-third of the authorized number
of directors or (ii) two. A California corporation's articles of incorporation
may require more than a majority of the authorized number of directors (up to
and including all of the directors) for a quorum. The Dominguez Bylaws provide
that a majority of the number of authorized directors shall constitute a quorum.
The Group Bylaws provide that a majority of the number of authorized directors
shall constitute a quorum.
 
     Under the DGCL, a quorum of the board of directors is equal to a majority
of the total number of authorized directors unless the certificate of
incorporation or bylaws provides for a greater number or a lesser number (which
in no case can be less than one-third of the total number of directors). Neither
the proposed certificate of incorporation nor the bylaws of Group-Delaware would
modify the statutory provision.
 
SHAREHOLDER RIGHTS PLAN
 
     Both California and Delaware permit corporations to adopt shareholder
rights plans which are designed to protect the interests of shareholders in the
event of a coercive or hostile takeover attempts. Dominguez has not adopted any
such rights plan. Group, however, has adopted a rights plan which is described
in "Description of Group Securities -- Preferred Share Purchase Right/Rights
Agreement." Group-Delaware will keep in place the shareholder rights plan.
 
APPLICATION OF THE GENERAL CORPORATION LAW OF CALIFORNIA TO DELAWARE
CORPORATIONS
 
     Under Section 2115 of the CGCL, certain foreign corporations (i.e.,
corporations not organized under California law) which have significant contacts
with California are subject to a number of key provisions of the CGCL. However,
Section 2115 exempts corporations whose shares are listed on a major national
securities exchange, such as the NYSE. The common stock of Group-Delaware will
continue to be traded on the NYSE and, accordingly, it is expected that
Group-Delaware will be exempt from Section 2115.
 
     THE FOREGOING SUMMARY DOES NOT PURPORT TO BE A COMPLETE STATEMENT OF THE
RIGHTS OF HOLDERS OF DOMINGUEZ COMMON STOCK OR HOLDERS OF GROUP COMMON STOCK,
AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO THE DGCL AND THE CGCL, AND THE
RESPECTIVE CHARTER DOCUMENTS OF DOMINGUEZ AND GROUP.
 
                                       82
<PAGE>   91
 
                                 LEGAL OPINIONS
 
     The legality of the shares of Group to be issued in connection with the
Merger is being passed upon for Group by Nossaman, Guthner, Knox & Elliott, LLP,
counsel for Group.
 
                                    EXPERTS
 
     The financial statements and schedules of California Water Service Group
and subsidiaries as of December 31, 1998 and 1997, and for each of the years in
the three-year period ended December 31, 1998, have been incorporated by
reference herein and in the registration statement in reliance upon the report
of KPMG LLP, independent certified public accountants, incorporated by reference
herein, and upon the authority of said firm as experts in accounting and
auditing.
 
     The financial statements of Dominguez as of December 31, 1998 and 1997, and
for each of the years in the three-year period ended December 31, 1998,
incorporated by reference herein and in the registration statement, have been
audited by Arthur Andersen LLP, independent public accountants, as indicated in
their report with respect thereto, and are incorporated by reference herein in
reliance upon the authority of said firm as experts in giving said reports.
 
                                       83
<PAGE>   92
 
                                   APPENDIX A
 
                      AGREEMENT AND PLAN OF REORGANIZATION
 
                                     AMONG
 
                        CALIFORNIA WATER SERVICE GROUP,
                        CALIFORNIA WATER SERVICE COMPANY
 
                                      AND
 
                         DOMINGUEZ SERVICES CORPORATION
 
                            DATED: NOVEMBER 13, 1998
<PAGE>   93
 
                               TABLE OF CONTENTS
 
<TABLE>
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ARTICLE I      DEFINITIONS.................................................      1
ARTICLE II     TERMS OF MERGER.............................................      5
     2.1       Effect of Merger and Surviving Corporation..................      5
     2.2       Stock of DSC................................................      5
     2.3       Conversions of DSC Stock....................................      5
     2.4       Effect on CWSG Stock........................................      6
     2.5       Fractional Shares...........................................      6
     2.6       Exchange Procedures.........................................      6
     2.7       Directors of Surviving Corporation and CWSG.................      7
     2.8       Officers and Employees of Surviving Corporation and CWSG....      8
     2.9       Form of the Transaction.....................................      8
ARTICLE III    THE CLOSING.................................................      8
     3.1       Closing Date................................................      8
     3.2       Execution of Agreements.....................................      8
     3.3       Further Assurances..........................................      8
ARTICLE IV     REPRESENTATIONS AND WARRANTIES OF DSC.......................      8
     4.1       Incorporation, Standing and Power...........................      8
     4.2       Capitalization..............................................      9
     4.3       DSC Subsidiaries............................................      9
     4.4       Financial Statements........................................      9
     4.5       Reports and Filings.........................................      9
     4.6       Authority of DSC............................................     10
     4.7       Insurance...................................................     10
     4.8       Personal Property...........................................     10
     4.9       Title to Properties and Assets..............................     10
     4.10      Litigation..................................................     11
     4.11      Taxes.......................................................     11
     4.12      Compliance with Laws and Regulations........................     12
     4.13      Performance of Obligations..................................     13
     4.14      Employees...................................................     14
     4.15      Brokers and Finders.........................................     14
     4.16      Material Contracts..........................................     14
     4.17      Certain Material Changes....................................     15
     4.18      Licenses and Permits........................................     16
     4.19      Undisclosed Liabilities.....................................     16
     4.20      Employee Benefit Plans......................................     16
     4.21      Corporate Records...........................................     17
     4.22      Accounting Records..........................................     17
     4.23      Offices.....................................................     17
     4.24      Investment Securities.......................................     18
     4.25      Power of Attorney...........................................     18
     4.26      Facts Affecting Regulatory Approvals........................     18
     4.27      Accounting and Tax Matters..................................     18
     4.28      Indemnification.............................................     18
     4.29      Derivative Transactions.....................................     18
     4.30      Disclosure Documents and Applications.......................     18
</TABLE>
 
                                        i
<PAGE>   94
 
<TABLE>
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     4.31      Year 2000 Plan and Compliance...............................     18
     4.32      Accuracy and Currentness of Information Furnished...........     18
     4.33      Standard....................................................     18
     4.34      Warn Act....................................................     19
ARTICLE V      REPRESENTATIONS AND WARRANTIES OF CWSG......................     19
     5.1       Incorporation, Standing and Power...........................     19
     5.2       Capitalization..............................................     19
     5.3       Financial Statements........................................     19
     5.4       Reports and Filings.........................................     20
     5.5       Authority...................................................     20
     5.6       CWSG Subsidiaries...........................................     21
     5.7       Brokers and Finders.........................................     21
     5.8       Certain Material Changes....................................     21
     5.9       Licenses and Permits........................................     21
     5.10      Corporate Records...........................................     22
     5.11      Accounting Records..........................................     22
     5.12      Facts Affecting Regulatory Approvals........................     22
     5.13      Accounting and Tax Matters..................................     22
     5.14      Disclosure Documents and Applications.......................     22
     5.15      New York Stock Exchange Listing.............................     22
     5.16      Litigation..................................................     22
     5.17      Compliance with Laws and Regulations........................     23
     5.18      Performance of Obligations..................................     24
     5.19      Material Contracts..........................................     24
     5.20      Undisclosed Liabilities.....................................     25
     5.21      Year 2000 Plan and Compliance...............................     25
     5.22      Accuracy and Currentness of Information Furnished...........     25
     5.23      Standard....................................................     25
ARTICLE VI     COVENANTS OF DSC PENDING EFFECTIVE TIME OF THE MERGER.......     26
     6.1       Limitation on DSC's Conduct Prior to Effective Time of the       26
               Merger......................................................
     6.2       Affirmative Conduct of DSC and DSC Subsidiaries Prior to         29
               Effective
               Time of the Merger..........................................
     6.3       Access to Information.......................................     30
     6.4       Review by Accountants.......................................     30
     6.5       Filings.....................................................     31
     6.6       Notices; Reports............................................     31
     6.7       DSC Shareholders' Meeting...................................     31
     6.8       [deleted]...................................................     31
     6.9       Applications................................................     31
     6.10      Affiliates and Five Percent Shareholder Agreements..........     32
     6.11      Coordination of Dividends...................................     32
     6.12      D&O Coverage................................................     32
ARTICLE VII    COVENANTS OF CWSG PENDING EFFECTIVE TIME OF THE MERGER......     32
     7.1       Limitation on CWSG's Conduct Prior to Effective Time of the      32
               Merger......................................................
     7.2       Affirmative Conduct of CWSG and CWSG Subsidiaries Prior to       33
               Effective Time of the Merger................................
     7.3       Access to Information.......................................     34
</TABLE>
 
                                       ii
<PAGE>   95
 
<TABLE>
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                                                                               ----
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     7.4       Filings.....................................................     34
     7.5       Applications................................................     34
     7.6       Blue Sky....................................................     35
     7.7       Sales and Net Income Reports................................     35
     7.8       Securities Act and Exchange Act Filings.....................     35
     7.9       Notices; Reports............................................     35
     7.10      Removal of Conditions.......................................     35
ARTICLE VIII   ADDITIONAL COVENANTS........................................     35
     8.1       Best Efforts................................................     35
     8.2       Public Announcements........................................     35
     8.3       [deleted]...................................................     36
     8.4       [deleted]...................................................     36
     8.5       Confidentiality and Non-Disclosure..........................     36
     8.6       Return of Materials.........................................     36
ARTICLE IX     CONDITIONS PRECEDENT TO THE MERGER..........................     37
     9.1       Shareholder Approval........................................     37
     9.2       No Judgments or Orders......................................     37
     9.3       Regulatory Approvals........................................     37
     9.4       Securities Laws.............................................     37
     9.5       Listing.....................................................     37
     9.6       Tax Opinions................................................     37
     9.7       Pooling of Interests........................................     37
ARTICLE X      CONDITIONS PRECEDENT TO THE OBLIGATIONS OF DSC..............     38
     10.1      Legal Opinion...............................................     38
     10.2      Representations and Warranties; Performance of Covenants....     38
     10.3      Authorization of Merger.....................................     38
     10.4      Absence of Certain Changes..................................     38
     10.5      Officers' Certificate.......................................     38
     10.6      Fairness Opinion............................................     38
     10.7      [deleted]...................................................     38
ARTICLE XI     CONDITIONS PRECEDENT TO OBLIGATIONS OF CWSG AND WATER            39
               COMPANY.....................................................
     11.1      Legal Opinion...............................................     39
     11.2      Representations and Warranties; Performance of Covenants....     39
     11.3      Authorization of Merger.....................................     39
     11.4      Third Party Consents........................................     39
     11.5      Absence of Certain Changes..................................     39
     11.6      Officers' Certificate.......................................     39
     11.7      [deleted]...................................................     39
     11.8      [deleted]...................................................     39
     11.9      [deleted]...................................................     39
     11.10     Affiliates Agreements.......................................     40
     11.11     Employee Benefit Plans......................................     40
     11.12     Dissenting Shares...........................................     40
     11.13     [deleted]...................................................     40
     11.14     [deleted]...................................................     40
     11.15     [deleted]...................................................     40
     11.16     Termination of DSC Stock Option Plans.......................     40
</TABLE>
 
                                       iii
<PAGE>   96
 
<TABLE>
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ARTICLE XII    EMPLOYEE BENEFITS...........................................     40
     12.1      Employee Benefits...........................................     40
ARTICLE XIII   TERMINATION.................................................     40
     13.1      Termination.................................................     40
     13.2      Termination Date............................................     41
     13.3      Effect of Termination.......................................     41
     13.4      Force Majeure...............................................     41
ARTICLE XIV    MISCELLANEOUS...............................................     42
     14.1      Expenses....................................................     42
     14.2      Liquidated Damages; Bust-up Fees............................     42
     14.3      Notices.....................................................     43
     14.4      Successors and Assigns......................................     43
     14.5      Counterparts................................................     44
     14.6      Effect of Representations and Warranties....................     44
     14.7      Third Parties...............................................     44
     14.8      Lists, Exhibits; Integration................................     44
     14.9      Knowledge...................................................     44
     14.10     Governing Law...............................................     44
     14.11     Captions....................................................     44
     14.12     Severability................................................     44
     14.13     Waiver and Modification; Amendment..........................     44
     14.14     Attorneys' Fees.............................................     44
     14.15     Arbitration.................................................     44
     14.16     Other Rights and Remedies...................................     45
</TABLE>
 
EXHIBIT A -- Agreement of Merger
EXHIBIT B -- Form of Affiliate Agreement
 
                                       iv
<PAGE>   97
 
                      AGREEMENT AND PLAN OF REORGANIZATION
 
     THIS AGREEMENT AND PLAN OF REORGANIZATION ("Agreement") is made and entered
into as of the 13th day of November, 1998, by and among CALIFORNIA WATER SERVICE
GROUP, a California corporation ("CWSG"), CALIFORNIA WATER SERVICE COMPANY, a
California corporation and wholly-owned subsidiary of CWSG ("Water Company"),
and DOMINGUEZ SERVICES CORPORATION, a California corporation ("DSC").
 
     WHEREAS, the Boards of Directors of CWSG, Water Company and DSC deem
advisable and in the best interests of their respective shareholders the merger
of DSC with and into Water Company (the "Merger") upon the terms and conditions
set forth herein and in accordance with the California General Corporation Law
(the "CGCL") (Water Company, following the effectiveness of the Merger, being
hereinafter sometimes referred to as the "Surviving Corporation"); and
 
     WHEREAS, the Boards of Directors of CWSG, Water Company and DSC have
approved the Merger pursuant to this Agreement and pursuant to the Agreement of
Merger by and among CWSG, Water Company and DSC (the "Agreement of Merger"), in
substantially the form of Exhibit A attached hereto, pursuant to which DSC will
merge with and into Water Company and each outstanding share of DSC common
stock, one dollar ($1) par value ("DSC Stock") excluding any DSC Perfected
Dissenting Shares (as defined below), will be converted into the right to
receive a specified amount of CWSG common stock, no par value ("CWSG Stock"),
upon the terms and subject to the conditions set forth herein.
 
     NOW, THEREFORE, on the basis of the foregoing recitals and in consideration
of the mutual covenants, agreements, representations and warranties contained
herein, the parties hereto do covenant and agree as follows:
 
                                   ARTICLE I
 
                                  DEFINITIONS
 
     Except as otherwise expressly provided for in this Agreement, or unless the
context otherwise requires, as used throughout this Agreement the following
terms shall have the respective meanings specified below:
 
     "A.G. Edwards Agreement" means the letter agreement dated May 26, 1998
between A.G. Edwards & Sons and CWSG.
 
     "Affiliate" of, or a person "Affiliated" of, or a person Affiliated with, a
specific person(s) is a person that directly or indirectly, through one or more
intermediaries controls, or is controlled by, or is under common control with,
the person(s) specified.
 
     "Agreement of Merger" means the Agreement of Merger substantially in the
form attached hereto as "Exhibit A."
 
     "Arthur Andersen" means Arthur Andersen, LLP, DSC's independent
accountants.
 
     "Benefit Arrangements" has the meaning set forth in Section 4.20(b).
 
     "Business Day" means any day other than a Saturday, Sunday or day on which
a bank chartered under the laws of the State of California is closed.
 
     "CGCL" means California General Corporation Law.
 
     "Closing" means the consummation of the Merger provided for in Article III
of this Agreement on the Closing Date (as defined herein) at the offices of
Nossaman, Guthner, Knox & Elliott, LLP, San Francisco, California, or at such
other place as the parties may agree upon.
 
     "Closing Date" means the date which falls on the fifth business day
following the last to occur of (i) the approval of this Agreement and the
transactions contemplated hereby by the shareholders of DSC, (ii) the receipt of
all permits, authorizations, approvals and consents specified in Section 9.3
hereof, (iii) the expiration of all applicable waiting periods under the law,
and (iv) the expiration of the 30 day period
 
                                       -1-
<PAGE>   98
 
following the mailing by DSC to its shareholders of a notice of approval of the
Merger by the outstanding shares pursuant to Section 1301 of the CGCL; provided,
however, that the Closing Date shall not be later than the Drop Dead Date,
unless otherwise agreed to by a majority of the Boards of Directors of each of
the parties hereto.
 
     "Code" means the Internal Revenue Code of 1986, as amended.
 
     "Commission" means the Public Utilities Commission of the State of
California.
 
     "Competing Transaction" has the meaning set forth in Section 6.1(n).
 
     "Conversion Ratio" has the meaning set forth in Section 2.3(a).
 
     "Covered Person" has the meaning set forth in Section 4.28.
 
     "CWSG 401(k) Plan" means the CWSG 401(k) Profit Sharing Plan.
 
     "CWSG Average Closing Price" means the average of the daily closing price
of a share of CWSG Stock reported on the New York Stock Exchange during the 20
consecutive trading days ending at the end of the third trading day immediately
preceding the Effective Time of the Merger.
 
     "CWSG Conflicts and Consents List" has the meaning set forth in Section
5.5.
 
     "CWSG Contract List" has the meaning set forth in Section 5.19.
 
     "CWSG Environmental Compliance List" has the meaning set forth in Section
5.17.
 
     "CWSG Filings" has the meaning set forth in Section 5.4.
 
     "CWSG Filings List" has the meaning set forth in Section 5.4.
 
     "CWSG Litigation List" has the meaning set forth in Section 5.16.
 
     "CWSG Scheduled Contracts" has the meaning set forth in Section 5.19.
 
     "CWSG Short Term Borrowings List" has the meaning set forth in Section
5.19(i).
 
     "CWSG Stock" means the common stock, no par value, of CWSG.
 
     "CWSG Subsidiaries" has the meaning set forth in Section 5.6.
 
     "CWSG Supplied Information" has the meaning set forth in Section 5.14.
 
     "CWSG Undisclosed Liabilities List" has the meaning set forth in Section
5.20.
 
     "CWSG Year 2000 Exceptions List" has the meaning set forth in Section 5.21.
 
     "Drop Dead Date" means November 13, 1999; provided that if Commission
approval of the Merger is pending when all of the following events have
occurred: (i) the approval of this Agreement and the transactions contemplated
hereby by the shareholders of DSC, (ii) the receipt of all permits,
authorizations, approvals (with the exception of Commission approval) and
consents specified in Section 9.3 hereof, (iii) the expiration of all applicable
waiting periods under the law, and (iv) the expiration of the 30 day period
following the mailing by DSC of a notice of approval of the Merger by the
outstanding shares pursuant to Section 1301 of the CGCL, then the Drop Dead Date
is August 13, 2000.
 
     "DSC 401(k) Plan" means the DSC 401(k) Plan.
 
     "DSC Asset Transfers List" has the meaning set forth in Section 4.9.
 
     "DSC Bonus Plan" has the meaning set forth in Section 6.1(f).
 
     "DSC Conflicts and Consents List" has the meaning set forth in Section 4.6.
 
     "DSC Contract List" has the meaning set forth in Section 4.16.
 
                                       -2-
<PAGE>   99
 
     "DSC Dissenting Shares" means any shares of DSC Stock held by "dissenting
shareholders" within the meaning of Chapter 13 of the CGCL.
 
     "DSC Employee Plan List" has the meaning set forth in Section 4.20.
 
     "DSC Employment/Labor Issues List" has the meaning set forth in Section
4.14.
 
     "DSC Environmental Compliance List" has the meaning set forth in Section
4.12.
 
     "DSC Filings" has the meaning set forth in Section 4.5.
 
     "DSC Filings List" has the meaning set forth in Section 4.5.
 
     "DSC Indemnification List" has the meaning set forth in Section 4.28.
 
     "DSC Insurance List" has the meaning set forth in Section 4.7.
 
     "DSC Investment Securities List" has the meaning set forth in Section 4.24.
 
     "DSC List" means any list required to be furnished by DSC to CWSG herewith.
 
     "DSC Litigation List" has the meaning set forth in Section 4.10.
 
     "DSC Offices List" has the meaning set forth in Section 4.23.
 
     "DSC Option List" has the meaning set forth in Section 4.2.
 
     "DSC Pending Acquisitions List" has the meaning set forth in Section
6.1(a).
 
     "DSC Perfected Dissenting Shares" means DSC Dissenting Shares which the
holders thereof have not withdrawn or caused to lose their status as DSC
Dissenting Shares.
 
     "DSC Personal Property List" has the meaning set forth in Section 4.8.
 
     "DSC Real Property List" has the meaning set forth in Section 4.9.
 
     "DSC Scheduled Contracts" has the meaning set forth in Section 4.16.
 
     "DSC Shareholders' Meeting" means the meeting of DSC's shareholders
referred to in Section 6.7.
 
     "DSC Short Term Borrowings List" has the meaning set forth in Section
4.16(i).
 
     "DSC Stock" means the common stock, one dollar ($1) par value, of DSC.
 
     "DSC Stock Option" means any option issued pursuant to the DSC Stock Option
Plan.
 
     "DSC Stock Option Plan" means the DSC 1997 Stock Option Plan.
 
     "DSC Subsidiaries" has the meaning set forth in Section 4.3.
 
     "DSC Supplied Information" has the meaning set forth in Section 4.30.
 
     "DSC Tax List" has the meaning set forth in Section 4.11.
 
     "DSC Undisclosed Liabilities List" has the meaning set forth in Section
4.19.
 
     "DSC Year 2000 Exceptions List" has the meaning set forth in Section 4.31.
 
     "Effective Time of the Merger" means the date upon which the Merger is
consummated and the Agreement of Merger is filed with the Secretary of State of
the State of California.
 
     "Employee Plans" has the meaning set forth in Section 4.20(a).
 
     "Encumbrance" shall mean any option, pledge, security interest, lien,
charge, encumbrance or restriction (whether on voting or disposition or
otherwise), whether imposed by agreement, understanding, law or otherwise.
 
     "Environmental Regulations" has the meaning set forth in Section 4.12(b).
 
                                       -3-
<PAGE>   100
 
     "ERISA" means the Employee Retirement Income Security Act of 1974, as
amended.
 
     "Evaluation Material" has the meaning set forth in Section 8.5(a).
 
     "Exchange Act" means the Securities Exchange Act of 1934, as amended.
 
     "Exchange Agent" means Boston Equiserve or such other person designated by
the parties.
 
     "Exchange Fund" has the meaning set forth in Section 2.6(a) hereof.
 
     "Financial Statements of CWSG" means the audited consolidated financial
statements of CWSG or its predecessor in interest consisting of the consolidated
balance sheets as of December 31, 1994, 1995, 1996 and 1997, the related
consolidated statements of income, common stockholders' equity and cash flows
for the years then ended and the related notes thereto and related independent
accountants' opinions thereon for the years then ended and CWSG's or its
predecessor in interests' unaudited consolidated balance sheet and consolidated
statements of income and cash flows as of and for the nine month period ended
September 30, 1998.
 
     "Financial Statements of DSC" means the audited consolidated financial
statements of DSC consisting of the consolidated balance sheets as of December
31, 1994, 1995, 1996 and 1997, the related statements of operations, common
stockholders' equity and cash flows for the years then ended and the related
notes thereto and related independent accountants' opinions thereon for the
years then ended and DSC's unaudited consolidated balance sheet and statements
of operations and cash flows as of and for the nine month period ended September
30, 1998.
 
     "Governmental Entity" shall mean any court or tribunal in any jurisdiction
or any United States federal, state, municipal, domestic, foreign or other
administrative authority or instrumentality.
 
     "Hazardous Materials" has the meaning set forth in Section 4.12(b).
 
     "Immediate Family" means a person's spouse, parents, in-laws, children and
siblings.
 
     "Investment Security" means any equity security or debt security as defined
in Statement of Financial Accounting Standards No. 15.
 
     "IRS" means the Internal Revenue Service.
 
     "KPMG Peat Marwick" means KPMG Peat Marwick LLP, CWSG's independent
auditors and accountants.
 
     "Material Adverse Effect" means with respect to CWSG or DSC, any effect
that, individually or in the aggregate (a) is material and adverse to the
business, financial condition or results of operation of CWSG and the CWSG
Subsidiaries taken as a whole or DSC and the DSC Subsidiaries taken as a whole,
respectively, or (b) would materially impair the ability of either CWSG or DSC
to consummate the Merger and the other transactions contemplated by this
Agreement prior to the Drop Dead Date, provided that a Material Adverse Effect
shall not be deemed to have occurred as a result of a change in general economic
conditions or a change in laws or regulations.
 
     "Merger" means the merger of DSC with and into Water Company pursuant to
this Agreement and the Agreement of Merger.
 
     "PaineWebber Agreement" means the letter agreement dated August 10, 1998
between PaineWebber, Incorporated and DSC.
 
     "Person" means any individual, corporation, association, partnership,
trust, joint venture, limited liability company, other entity, unincorporated
body, government or governmental department or agency.
 
     "Proxy Statement and Prospectus" means the Proxy Statement and Prospectus
that is included as part of the Registration Statement on Form S-4 (as defined
herein) and used to solicit proxies for the DSC Shareholders' Meeting (as
defined herein) and to offer and sell the shares of CWSG Stock to be issued in
connection with the Merger.
 
                                       -4-
<PAGE>   101
 
     "Related Group of Persons" means Affiliates, members of an Immediate Family
or Persons the obligations of whom would be attributed to another Person
pursuant to the regulations promulgated by the SEC (as defined herein).
 
     "Registration Statement on Form S-4" means the Registration Statement on
Form S-4, and such amendments thereto, that is filed with the SEC to register
the shares of CWSG Stock to be issued in the Merger under the Securities Act and
to clear use of the Proxy Statement and Prospectus in connection with the DSC
Shareholders' Meeting pursuant to the regulations promulgated under the Exchange
Act.
 
     "SEC" means the Securities and Exchange Commission.
 
     "Securities Act" means the Securities Act of 1933, as amended.
 
     "Surviving Corporation" means the California corporation created by the
Merger of DSC with and into Water Company.
 
     "Tank" has the meaning set forth in Section 4.12(b).
 
     "Tax" has the meaning set forth in Section 4.11(j).
 
     "Tax Return" has the meaning set forth in Section 4.11(j).
 
     "Transaction Expenses" means expenses incurred by DSC in connection with
the Merger which expenses are not in excess of one million five hundred thousand
dollars ($1,500,000) in the aggregate for the entire transaction being
contemplated by and between CWSG and DSC.
 
     "Warn Act" means the Worker Adjustment and Retraining Notification Act, as
codified at 29 U.S.C. Section 2102-2109, as amended.
 
                                   ARTICLE II
 
                                TERMS OF MERGER
 
     2.1  Effect of Merger and Surviving Corporation. At the Effective Time of
the Merger, DSC will be merged with and into Water Company pursuant to the
terms, conditions and provisions of the Agreement of Merger and in accordance
with the applicable provisions of the CGCL. By virtue of the Merger, all the
rights, privileges, powers and franchises and all property and assets of every
kind and description of Water Company and DSC shall be vested in and be held and
enjoyed by the Surviving Corporation, without further act or deed, and all the
interests of every kind of Water Company and DSC, including all debts due to
either of them on whatever account, shall be the property and obligation of the
Surviving Corporation as they were of Water Company and DSC and the title to any
interest in real property and any interest in personal property vested by deed
or otherwise in either Water Company or DSC shall not revert or be in any way
impaired by reason of the Merger; and all rights of creditors and liens upon any
property of Water Company and DSC shall be preserved unimpaired and all debts,
liabilities and duties of Water Company and DSC shall be debts, liabilities and
duties of the Surviving Corporation and may be enforced against it to the same
extent as if said debts, liabilities and duties had been incurred or contracted
by it.
 
     2.2  Stock of DSC. Each share of common stock, one dollar ($1) par value,
of DSC issued and outstanding immediately prior to the Effective Time of the
Merger shall, without any further action on the part of DSC or the holder of
such shares, be converted pursuant to the terms of the Agreement of Merger as
set forth in Section 2.3. From and after the Effective Time of the Merger, each
certificate that, prior to the Effective Time of the Merger, represented shares
of DSC shall evidence ownership of shares of CWSG on the basis set forth above.
 
     2.3  Conversions of DSC Stock. (a) On the Effective Time of the Merger,
pursuant to the Agreement of Merger, each outstanding share of DSC Stock
excluding, if any, DSC Perfected Dissenting Shares or shares of DSC Stock held
by CWSG shall, without any further action on the part of DSC or the holders of
any such shares, be converted into 1.18 shares of CWSG Stock (the "Conversion
Ratio").
 
                                       -5-
<PAGE>   102
 
     (b) DSC Perfected Dissenting Shares shall not be converted into shares of
CWSG Stock but shall, after the Effective Time of the Merger, be entitled only
to such rights as are granted them by Chapter 13 of the CGCL. Each dissenting
shareholder who is entitled to payment for his shares of DSC Stock shall receive
such payment in an amount as determined pursuant to Chapter 13 of the CGCL.
 
     (c) Each outstanding share of DSC Stock held by CWSG shall be canceled.
 
     (d) If, prior to the Effective Time of the Merger, CWSG shall declare a
stock dividend or distribution upon or subdivide, split up, reclassify or
combine the CWSG Stock, or make a distribution on the CWSG Stock in any security
convertible into CWSG Stock, as of a record date prior to the Effective Time of
the Merger, appropriate adjustment or adjustments (rounded to four digits to the
right of the decimal point) will be made to the Conversion Ratio.
 
     (e) If any DSC Stock Options which are exercisable at the date of this
Agreement, or become exercisable prior to the Closing, are exercised prior to
the Closing, the shares of DSC Stock issued upon such exercise shall be
converted to the right to receive shares of CWSG Stock at the Closing.
 
     2.4  Effect on CWSG Stock. On the Effective Time of the Merger, each
outstanding share of CWSG Stock shall remain an outstanding share of CWSG Stock
and shall not be converted or otherwise affected by the Merger.
 
     2.5  Fractional Shares. No fractional shares of CWSG Stock shall be issued
in the Merger. In lieu thereof, each holder of DSC Stock who would otherwise be
entitled to receive a fractional share shall receive an amount in cash equal to
the product (calculated to the nearest hundredth) obtained by multiplying (a)
the CWSG Average Closing Price times (b) the fraction of the share of CWSG Stock
to which such holder would otherwise be entitled. No such holder shall be
entitled to dividends or other rights in respect of any such fraction.
 
     2.6  Exchange Procedures.
 
     (a) As of the Effective Time of the Merger, CWSG shall have deposited with
the Exchange Agent for the benefit of the holders of shares of DSC Stock, for
exchange in accordance with this Section 2.6 through the Exchange Agent,
certificates representing the shares of CWSG Stock issuable pursuant to Section
2.3 in exchange for shares of DSC Stock outstanding immediately prior to the
Effective Time of the Merger, and funds in an amount not less than the amount of
cash payable in lieu of fractional shares of CWSG Stock which would otherwise be
payable in connection with Section 2.3 hereof but for the operation of Section
2.5 of this Agreement (collectively, the "Exchange Fund").
 
     (b) CWSG shall direct the Exchange Agent to mail, promptly after the
Effective Time of the Merger, to each holder of record of a certificate or
certificates which immediately prior to the Effective Time of the Merger
represented outstanding shares of DSC Stock (the "Certificates") whose shares
were converted into the right to receive shares of CWSG Stock pursuant to
Section 2.3 hereof, (i) a letter of transmittal (which shall specify that
delivery shall be effected, and risk of loss and title to the Certificates shall
pass, only upon delivery of the Certificates to the Exchange Agent and shall be
in such form and have such other provisions as CWSG and DSC may reasonably
specify), and (ii) instructions for use in effecting the surrender of the
Certificates in exchange for certificates representing shares of CWSG Stock.
Upon surrender of a Certificate for cancellation to the Exchange Agent or to
such other agent or agents as may be appointed by CWSG, together with such
letter of transmittal, duly executed, the holder of such Certificate shall be
entitled to receive in exchange therefor that amount of cash and a certificate
representing that number of whole shares of CWSG Stock which such holder has the
right to receive pursuant to the provisions of Sections 2.3 and 2.5 hereof, and
the Certificate so surrendered shall forthwith be canceled. In the event a
certificate is surrendered representing DSC Stock, the transfer of ownership
which is not registered in the transfer records of DSC, a certificate
representing the proper number of shares of CWSG Stock may be issued to a
transferee if the Certificate representing such DSC Stock is presented to the
Exchange Agent, accompanied by all documents required to evidence and effect
such transfer and by evidence that any applicable stock transfer taxes have been
paid. Until surrendered as contemplated by this Section 2.6, each Certificate
shall be deemed at any time after the Effective Time of the Merger to represent
only the right to receive upon such surrender
 
                                       -6-
<PAGE>   103
 
the certificate representing shares of CWSG Stock and cash in lieu of any
fractional shares of stock as contemplated by this Section 2.6. Notwithstanding
anything to the contrary set forth herein, if any holder of shares of DSC should
be unable to surrender the Certificates for such shares, because they have been
lost or destroyed, such holder may deliver in lieu thereof such affidavit or
bond in form and substance and with surety reasonably satisfactory to CWSG and
shall be entitled to receive the certificate representing the proper number of
shares of CWSG Stock and cash in lieu of fractional shares in accordance with
Sections 2.3 and 2.5 hereof.
 
     (c) No dividends or other distributions declared or made after the
Effective Time of the Merger with respect to CWSG Stock with a record date after
the Effective Time of the Merger shall be paid to the holder of any
unsurrendered Certificate with respect to the shares of CWSG Stock represented
thereby and no cash payment in lieu of fractional shares shall be paid to any
such holder pursuant to Section 2.5 until the holder of record of such
Certificate shall surrender such Certificate. Subject to the effect of
applicable laws, following surrender of any such Certificate, there shall be
paid to the record holder of the certificates representing whole shares of CWSG
Common Stock issued in exchange thereof, without interest, (i) at the time of
such surrender, the amount of any cash payable in lieu of a fractional share of
CWSG Stock to which such holder is entitled pursuant to Section 2.5 and the
amount of dividends or other distributions with a record date after the
Effective Time of the Merger theretofore paid with respect to such whole shares
of CWSG Stock, and (ii) at the appropriate payment date, the amount of dividends
or other distributions with a record date after the Effective Time of the Merger
but prior to surrender and a payment date subsequent to surrender payable with
respect to such whole shares of CWSG Stock.
 
     (d) All shares of CWSG Stock issued upon the surrender for exchange of DSC
Stock in accordance with the terms hereof (including any cash paid pursuant to
Section 2.5) shall be deemed to have been issued in full satisfaction of all
rights pertaining to such shares of DSC Stock, and there shall be no further
registration of transfers on the stock transfer books of the Surviving
Corporation of the shares of DSC Stock which were outstanding immediately prior
to the Effective Time of the Merger. If, after the Effective Time of the Merger,
Certificates are presented to CWSG for any reason, they shall be canceled and
exchanged as provided in this Agreement.
 
     (e) Any portion of the Exchange Fund which remains undistributed to the
shareholders of DSC following the passage of six months after the Effective Time
of the Merger shall be delivered to CWSG, upon demand, and any shareholders of
DSC who have not theretofore complied with this Section 2.6 shall thereafter
look only to CWSG for payment of their claim for CWSG Stock, any cash in lieu of
fractional shares of CWSG Stock and any dividends or distributions with respect
to CWSG Stock.
 
     (f) Neither CWSG, Water Company nor DSC shall be liable to any holder of
shares of DSC Stock for such shares (or dividends or distributions with respect
thereto) or cash from the Exchange Fund delivered to a public official pursuant
to any applicable abandoned property, escheat or similar law.
 
     (g) The Exchange Agent shall not be entitled to vote or exercise any rights
of ownership with respect to the shares of CWSG Stock held by it from time to
time hereunder, except that it shall receive and hold all dividends or other
distributions paid or distributed with respect to such shares of CWSG Stock for
the account of the Persons entitled thereto.
 
     2.7  Directors of Surviving Corporation and CWSG. Immediately after the
Effective Time of the Merger, the Board of Directors of the Surviving
Corporation shall be comprised of the persons serving as directors of Water
Company immediately prior to the Effective Time of the Merger, or, if unable to
serve, such other persons designated by CWSG. Such persons shall serve until the
earlier of their resignation or removal or until their respective successors are
duly elected and qualified. Immediately after the Effective Time of the Merger,
the Board of Directors of CWSG shall be comprised of the persons serving as
directors of CWSG immediately prior to the Effective Time of the Merger, or, if
unable to serve, such other person designated by CWSG, plus one additional
person from the Board of Directors of DSC to be designated by the Board of
Directors of CWSG immediately before Closing. Such persons shall serve until the
earlier of their resignation or removal or until their respective successors are
duly elected and qualified.
 
                                       -7-
<PAGE>   104
 
     2.8  Officers and Employees of Surviving Corporation and CWSG. Immediately
after the Effective Time of the Merger, the executive officers of CWSG shall be
comprised of the persons serving as executive officers of CWSG immediately prior
to the Effective Time of the Merger. Such persons shall serve until the earlier
of their resignation or removal. Immediately after the Effective Time of the
Merger, the executive officers of the Surviving Corporation shall be comprised
of the persons serving as executive officers of Water Company immediately prior
to the Effective Time of the Merger. CWSG and DSC shall offer equivalent
employment to all employees of DSC who are employed by DSC immediately prior to
the Effective Time of the Merger. Those employees of DSC who are offered
employment requiring a transfer of more than fifty (50) miles and who also
decide not to accept employment with CWSG shall receive severance packages
consistent with DSC's past practices and acceptable to CWSG in accordance with
the provisions of a letter dated November 13, 1998 from Peter C. Nelson,
President and Chief Executive Officer of Water Company, to Brian J. Brady,
Chairman of the Board of DSC. The terms and conditions for the continued
employment or other relationship between CWSG and Brian J. Brady, the Chief
Executive Officer of DSC, and John S. Tootle, the Chief Financial Officer of
DSC, including, but not limited to, covenants not to compete and non-
solicitation provisions are contained in offer letters dated November 13, 1998
from Peter C. Nelson, President and Chief Executive Officer of Water Company to
Brian J. Brady, the Chief Executive Officer of DSC, and dated November 13, 1998
from Peter C. Nelson, President and Chief Executive Officer of Water Company to
John S. Tootle, the Chief Financial Officer of DSC, respectively.
 
     2.9  Form of the Transaction. The form of the transaction set forth above
is intended to achieve a tax free reorganization. If for regulatory or other
reasons, CWSG determines that another form of the transaction is necessary or
preferable, the parties agree that the form of the transaction may be modified
by CWSG, provided the transaction does not result in a different amount of
consideration to DSC and does not affect the status of the transaction as a tax
free reorganization.
 
                                  ARTICLE III
 
                                  THE CLOSING
 
     3.1  Closing Date. The Closing shall take place on the Closing Date.
 
     3.2  Execution of Agreements. As soon as practicable after execution of
this Agreement, the Agreement of Merger together with all other agreements
necessary to consummate the transactions described herein shall be executed by
CWSG, Water Company and DSC. On the Closing Date, the Agreement of Merger,
together with all requisite certificates, shall be duly filed with the Secretary
of State of the State of California as required by applicable law and
regulations.
 
     3.3  Further Assurances. At the Closing, the parties hereto shall deliver,
or cause to be delivered, such documents or certificates as may be necessary in
the reasonable opinion of counsel for any of the parties, to effectuate the
transactions contemplated by this Agreement. From and after the Effective Time
of the Merger, each of the parties hereto covenants and agrees, without the
necessity of any further consideration whatsoever, to execute, acknowledge and
deliver any and all other documents and instruments and take any and all such
other action as may be reasonably necessary or desirable to more effectively
carry out the intent and purpose of this Agreement and the Agreement of Merger.
 
                                   ARTICLE IV
 
                     REPRESENTATIONS AND WARRANTIES OF DSC
 
     DSC represents and warrants to CWSG with respect to DSC and the DSC
Subsidiaries as follows:
 
     4.1  Incorporation, Standing and Power. DSC and each of the DSC
Subsidiaries are California corporations duly organized, validly existing and in
good standing under the laws of the State of California. DSC and each of the DSC
Subsidiaries have all requisite corporate power and authority to own, lease and
operate its properties and assets and to carry on its business as presently
conducted. Neither the scope of the business of DSC and each of the DSC
Subsidiaries nor the location of any of its respective properties requires
 
                                       -8-
<PAGE>   105
 
that DSC or any of the DSC Subsidiaries be licensed to do business in any
jurisdiction other than the State of California where the failure to be so
licensed would, individually or in the aggregate, have a Material Adverse Effect
on DSC. DSC has delivered to CWSG true and correct copies of the Articles of
Incorporation and Bylaws, as amended, and in effect as of the date hereof, of
DSC and each of the DSC Subsidiaries.
 
     4.2  Capitalization. As of the date of this Agreement, the authorized
capital stock of DSC consists of 4,000,000 shares of one dollar ($1.00) par
value Common Stock, of which 1,506,512 shares are outstanding (approximately
60,624 shares of the Common Stock are to be issued upon consummation of pending
acquisitions, which acquisitions are anticipated to be consummated prior to the
Closing), 30,000 shares of Class A Preferred Stock, par value $25 per share,
none of which are outstanding, and 100,000 shares of Class B Preferred Stock,
par value $10 per share, none of which are outstanding. All of the outstanding
shares of DSC Common Stock are duly authorized, validly issued, fully paid and
nonassessable. Except for DSC Options covering approximately 40,740 shares of
DSC Stock granted pursuant to the DSC Stock Option Plan, there are no
outstanding options, warrants or other rights in or with respect to the unissued
shares of DSC Common or Preferred Stock nor any securities convertible into such
stock, and DSC is not obligated to issue any additional shares of its Common or
Preferred Stock or any additional options, warrants or other rights in or with
respect to the unissued shares of such stock or any other securities convertible
into such stock. DSC has furnished CWSG a list (the "DSC Option List") setting
forth the name of each holder of a DSC Option, the number of shares of DSC Stock
covered by each such option, the vesting schedule of such option, the exercise
price per share and the expiration date of each such DSC Option.
 
     4.3  DSC Subsidiaries. Other than DSC Water Company and its wholly owned
Subsidiaries, Kernville Domestic Water Company, Arden Water Company, Lakeland
Water Company and Redwood Valley Water Company, and DSC Investments and a twenty
percent (20%) equity interest in Chemical Services Company which is not a
subsidiary of DSC, DSC does not own, directly or indirectly, more than one
percent (1%) of the outstanding stock or equity or other voting interest in any
corporation, partnership, joint venture or other entity.
 
     4.4  Financial Statements. DSC has previously furnished to CWSG a copy of
the Financial Statements of DSC. The Financial Statements of DSC: (a) present
fairly and in all material respects the consolidated financial condition of DSC
and the DSC Subsidiaries as of the respective dates indicated and its
consolidated results of operations and statement of cash flows, for the
respective periods then ended, subject, in the case of the unaudited interim
financial statements, to normal recurring adjustments; (b) have been prepared in
accordance with generally accepted accounting principles consistently applied
(except as otherwise indicated therein); and (c) are based upon the books and
records of DSC.
 
     4.5  Reports and Filings. Except as set forth in a list (the "DSC Filings
List"), since the later of December 31, 1994, or the date which any DSC
Subsidiary became a DSC Subsidiary, DSC and each DSC Subsidiary has filed all
reports, returns, registrations and statements (such reports and filings
referred to as "DSC Filings"), together with any amendments required to be made
with respect thereto, that were required to be filed with the Commission and any
other applicable Governmental Entity, including taxing authorities, except where
the failure to file such reports, returns, registrations or statements has not
had and is not reasonably expected to have a Material Adverse Effect on DSC on a
consolidated basis. No administrative actions have been taken or orders issued
in connection with such DSC Filings. As of their respective dates, each of such
DSC Filings (y) complied in all material respects with all laws and regulations
enforced or promulgated by the Governmental Entity with which it was filed (or
was amended so as to be in compliance promptly following discovery of any such
noncompliance); and (z) did not contain any untrue statement of a material fact
or omit to state a material fact required to be stated therein or necessary to
make the statements therein, in light of the circumstances under which they were
made, not misleading. Any financial statement contained in any of such DSC
Filings fairly presented the financial position of DSC on a consolidated basis
and was prepared in accordance with generally accepted accounting principles
consistently applied, except as stated therein, during the periods involved. DSC
has furnished CWSG with true and correct copies of all DSC Filings filed by DSC
since 1994.
 
                                       -9-
<PAGE>   106
 
     4.6  Authority of DSC. The execution and delivery by DSC of this Agreement
and of the Agreement of Merger and, subject to the requisite approval of the
shareholders of DSC of this Agreement and the transactions contemplated hereby,
the consummation of the transactions contemplated hereby and thereby have been
duly and validly authorized by all necessary corporate action on the part of
DSC, and this Agreement is, and the Agreement of Merger will be, upon due
execution and delivery by the respective parties thereto, a valid and binding
obligation of DSC enforceable in accordance with their respective terms, except
as the enforceability thereof may be limited by bankruptcy, liquidation,
receivership, conservatorship, insolvency, moratorium or other similar laws
affecting the rights of creditors generally and by general equitable principles.
Except as set forth in a list furnished by DSC to CWSG (the "DSC Conflicts and
Consents List"), neither the execution and delivery by DSC of this Agreement or
the Agreement of Merger, the consummation of the transactions contemplated
herein or therein, nor compliance by DSC with any of the provisions hereof or
thereof, will: (a) conflict with or result in a breach of any provision of its
Articles of Incorporation, as amended, or Bylaws, as amended; (b) constitute a
breach of or result in a default (or give rise to any rights of termination,
cancellation or acceleration, or any right to acquire any securities or assets)
under any of the terms, conditions or provisions of any note, bond, mortgage,
indenture, franchise, license, permit, agreement or other instrument or
obligation to which DSC or any DSC Subsidiary is a party, or by which DSC or any
DSC Subsidiary or any of its respective properties or assets is bound, or
require the approval or consent of any third party; (c) result in the creation
or imposition of any Encumbrance on any of the properties or assets of DSC or
any DSC Subsidiary; or (d) violate any order, writ, injunction, decree, statute,
rule or regulation applicable to DSC or any DSC Subsidiary or any of their
respective properties or assets. Except as set forth in the DSC Conflicts and
Consents List, no consent of, approval of, notice to or filing with any
Governmental Entity having jurisdiction over any aspect of the business or
assets of DSC, and no consent of, approval of or notice to any other Person, is
required in connection with the execution and delivery by DSC of this Agreement,
the Agreement of Merger or the consummation by DSC of the Merger or the
transactions contemplated hereby or thereby, except (i) the approval of this
Agreement and the Agreement of Merger and the transactions contemplated hereby
and thereby by the shareholders of DSC; (ii) such approvals as may be required
by the Commission; (iii) the filing of the Proxy Statement and Prospectus and
Registration Statement on Form S-4 with the SEC; (iv) the filing of the
Agreement of Merger with the Secretary of State, and (v) the filing of
pre-merger notification reports by DSC and CWSG under the Hart-Scott-Rodino
Antitrust Improvements Act (1976), as amended.
 
     4.7  Insurance. DSC and each of the DSC Subsidiaries has policies of
insurance and bonds with respect to its assets and business against such
casualties and contingencies and in such amounts, types and forms as are
customarily appropriate for its business, operations, properties and assets. All
such insurance policies and bonds are in full force and effect. Except as set
forth in a list furnished by DSC to CWSG (the "DSC Insurance List"), no insurer
under any such policy or bond has canceled or indicated an intention to cancel
or not to renew any such policy or bond or generally disclaimed liability
thereunder. Except as set forth in the DSC Insurance List, DSC and each of the
DSC Subsidiaries is not in default under any such policy or bond and all
material claims thereunder have been filed in a timely fashion. Set forth in the
DSC Insurance List is a list of all policies of insurance carried and owned by
DSC and each of the DSC Subsidiaries showing the name of the insurance company,
the nature of the coverage, the policy limit, the annual premiums and the
expiration dates. There has been delivered to CWSG a copy of each such policy of
insurance.
 
     4.8  Personal Property. DSC and each of the DSC Subsidiaries has good and
marketable title to all its material properties and assets other than real
property owned or stated to be owned by DSC or any of the DSC Subsidiaries, free
and clear of all Encumbrances except: (a) as set forth in the Financial
Statements of DSC, (b) for Encumbrances for current taxes not yet due; (c) for
Encumbrances incurred in the ordinary course of business; (d) for Encumbrances
that are not substantial in character, amount or extent and that do not
materially detract from the value, or interfere with present use, of the
property subject thereto or affected thereby, or otherwise materially impair the
conduct of business of DSC or any of the DSC Subsidiaries; or (e) as set forth
in a list furnished by DSC to CWSG (the "DSC Personal Property List.")
 
     4.9  Title to Properties and Assets. DSC has furnished CWSG a list of real
property, including leaseholds and all other interests in real property (other
than security interests), owned by DSC or any of the
 
                                      -10-
<PAGE>   107
 
DSC Subsidiaries (the "DSC Real Property List"). DSC and each of the DSC
Subsidiaries has duly recorded or caused to be recorded, in the appropriate
county, all recordable interests in such real property. DSC and the DSC
Subsidiaries have good and defensible title to, or valid leasehold interests in,
their respective material real properties, whether owned or leased, including,
without limitation, (a) those used in their respective businesses, and (b) those
reflected in the consolidated unaudited balance sheet of DSC as of September 30,
1998 most recently delivered to CWSG (except as since sold or otherwise disposed
of in the ordinary course of business and except for defects in title,
easements, restrictive covenants and similar encumbrances or impediments that,
individually or in the aggregate, do not and will not materially interfere with
the ability of DSC or any of the DSC Subsidiaries to use their properties or to
conduct their businesses as currently conducted), in each case subject to no
mortgage, pledge, conditional sales contract, lien, security interest, right of
possession in favor of any third party, claim or other encumbrance (collectively
"Liens"), except for (v) Liens under Department of Water Resources loans
pursuant to the California Safe Drinking Water Bond Act of 1976, which are
listed on the DSC Real Property List, (w) the Lien of current taxes (as
hereinafter defined) not yet due and payable, (x) with respect to leased
property, the provisions of such leases, (y) Liens granted to DSC's lenders
under that certain DSC Indenture (the "DSC Indenture") dated August 1, 1954, as
amended and supplemented and (z) Liens, that, individually, or in the aggregate,
do not and will not materially interfere with the ability of DSC or any of the
DSC Subsidiaries to conduct business as currently conducted. Except as described
in a list furnished by DSC to CWSG (the "DSC Asset Transfers List"), subsequent
to September 30, 1998, neither DSC nor any of the DSC Subsidiaries has sold or
disposed of any of their respective properties or assets or obligated themselves
to do so. DSC has furnished CWSG with true and correct copies of all leases
included in the DSC Real Property List and all title insurance policies on real
property included in the DSC Real Property List.
 
     4.10  Litigation. Except as set forth in the DSC Filings or in a list
furnished by DSC to CWSG (the "DSC Litigation List"), there is no private or
governmental suit, claim, action or proceeding pending, nor to DSC's knowledge
threatened, against DSC or any of the DSC Subsidiaries or against any of their
respective directors, officers or employees relating to the performance of their
duties in such capacities or against or affecting any properties of DSC or any
of the DSC Subsidiaries which, if adversely determined, would have a Material
Adverse Effect on DSC or the transactions contemplated hereby, or which could
reasonably be expected to involve a judgment against DSC in excess of $50,000.
Also, except as disclosed in the DSC Filings or in the DSC Litigation List,
there are no material judgments, decrees, stipulations or orders against DSC or
enjoining its directors, officers or employees in respect of, or the effect of
which is to prohibit, any business practice or the acquisition of any property
or the conduct of business in any area.
 
     4.11  Taxes.
 
     (a) Except as set forth in the list furnished by DSC to CWSG (the "DSC Tax
List"): (i) all Tax Returns required to be filed by or on behalf of DSC or any
of the DSC Subsidiaries have been timely filed or requests for extensions have
been timely filed and any such extension shall have been granted and not have
expired, and all such filed returns are complete and accurate in all material
aspects; (ii) DSC and the DSC Subsidiaries have paid all Taxes (whether or not
shown on any Tax Return) for any period ending on or before the Effective Time
of the Merger or adequate provision has been made for any such Taxes in the
financial statements of DSC and the DSC Subsidiaries (in accordance with
generally accepted accounting principles); (iii) there is no audit examination,
deficiency assessment, or refund litigation currently pending with respect to
any Taxes of DSC or any of the DSC Subsidiaries; (iv) all Taxes due with respect
to completed and settled examinations or concluded litigation relating to DSC or
any of the DSC Subsidiaries have been paid in full or adequate provision has
been made for any such amounts in the financial statements of DSC and the DSC
Subsidiaries (in accordance with generally accepted accounting principles); (v)
no extensions or waivers of statutes of limitations have been given by or
requested with respect to any Taxes of DSC or any of the DSC Subsidiaries; and
(vi) there are no liens for Taxes upon the assets or property of DSC or the DSC
Subsidiaries except for statutory liens for current Taxes not yet due.
 
     (b) Except for the affiliated group among DSC and the DSC Subsidiaries, DSC
has never been a member of an affiliated group of corporations, within the
meaning of Section 1504 of the Code, or a member of combined, consolidated or
unitary group for state, local or foreign Tax purposes. DSC has not filed a
 
                                      -11-
<PAGE>   108
 
consent pursuant to the collapsible corporation provisions of Section 341(f) of
the Code (or any corresponding provision of state, local or foreign income Tax
law) or agreed to have Section 341(f)(2) of the Code (or any corresponding
provision of state, local or foreign income Tax law) apply to any disposition of
any asset owned by it. DSC has not made or will not make a consent dividend
election under Section 565 of the Code.
 
     (c) Except as set forth in the DSC Tax List, DSC has not agreed to make,
nor is it required to make, any adjustment under Sections 481(a) or 263A of the
Code or any comparable provision of state or foreign tax laws by reason of a
change in accounting method or otherwise. DSC has taken no action that is not in
accordance with prudent utility practice that could defer a liability for Taxes
of DSC from any taxable period ending on or before the Effective Time of the
Merger to any taxable period ending after such date.
 
     (d) DSC is not a party to any agreement, contract, arrangement or plan that
has resulted or would result, separately or in the aggregate, in connection with
the Merger, any change of control of DSC or any other transaction contemplated
by this Agreement, in the payment of any "excess parachute payments" within the
meaning of Section 280G of the Code.
 
     (e) DSC is not, and has not been, a United States real property holding
corporation (as defined in Section 897(C)(2) of the Code) during the applicable
period specified in Section 897(C)(l)(A)(ii) of the Code.
 
     (f) [deleted].
 
     (g) DSC does not have and has not had a permanent establishment in any
foreign country, as defined in any applicable Tax treaty or convention between
the United States and such foreign country, and, except as set forth in the DSC
Tax List, DSC has not engaged in a trade or business within any foreign country.
 
     (h) DSC is not a party to any joint venture, partnership, or other
arrangement or contract which could reasonably be expected to be treated as a
partnership for federal income tax purposes.
 
     (i) All outstanding options to acquire equity of DSC that purport to be or
were otherwise intended (when issued) to be treated as "incentive stock options"
("ISOs") within the meaning of Section 422 of the Code (and any predecessor
provision and any similar provision of applicable state, local or other Tax law)
were issued in compliance with such section. All such outstanding options
currently qualify for treatment as ISOs, and are held by persons who are
employees of DSC.
 
     (j) As used in this Agreement, (i) the term "Tax" or "Taxes" means taxes
and other impost, levies, assessments, duties, fees or charges imposed or
required to be collected by any federal, state, county, local, municipal,
territorial or foreign governmental authority or subdivision thereof, including,
without limitation, income, excise, gross receipts, ad valorem, profits, gains,
property, sales, transfer, use, payroll, employment, severance, withholding,
duties, intangible, franchise, personal property, and other taxes, charges,
levies or like assessments, together with all penalties and additions to tax and
interest thereon, and (ii) the term "Tax Return" shall mean any return, report,
information return or other document (including elections, declarations,
disclosures, schedules, estimates and other returns or supporting documents)
with respect to Taxes.
 
     4.12  Compliance with Laws and Regulations.
 
     (a) DSC and each of the DSC Subsidiaries is not in default under or in
breach of any provision of its Articles of Incorporation, as amended, or Bylaws,
as amended, or law, ordinance, rule or regulation promulgated by any
Governmental Entity, where such default or breach would have a Material Adverse
Effect on DSC.
 
     (b) Without limiting Section 4.12(a), to the knowledge of DSC and except as
set forth in a list furnished by DSC to CWSG (the "DSC Environmental Compliance
List") (i) DSC and each of the DSC Subsidiaries is in compliance with all
Environmental Regulations; (ii) there are no Tanks on or about DSC or any of the
DSC Subsidiaries' Property; (iii) except for Hazardous Materials (as defined
below) properly maintained in accordance with Environmental Regulations, there
are no Hazardous Materials on, below or above the surface of, or migrating to or
from DSC Property or any of the DSC Subsidiaries' Property; and (iv) without
limiting Section 4.10 or the foregoing representations and warranties contained
in clauses
 
                                      -12-
<PAGE>   109
 
(i) through (iii), as of the date of this Agreement, there is no claim, action,
suit, or proceeding or notice thereof before any Governmental Entity pending
against DSC or concerning property securing DSC loans and there is no
outstanding judgment, order, writ, injunction, decree, or award against or
affecting DSC Property or property securing DSC loans, relating to the foregoing
representations (i) through (iii), in each case the noncompliance with which, or
the presence of which would have a Material Adverse Effect on DSC. For purposes
of this Section 4.12(b), the term "Environmental Regulations" shall mean all
applicable statutes, regulations, rules, ordinances, codes, licenses, permits,
orders, approvals, plans, authorizations, concessions, franchises, and similar
items, of all Governmental Entities and all applicable judicial, administrative,
and regulatory decrees, judgments, and orders relating to the protection of
human health or the environment, including, without limitation: all
requirements, including, but not limited to those pertaining to reporting,
licensing, permitting, investigation, and remediation of emissions, discharges,
releases, or threatened releases of Hazardous Materials, chemical substances,
pollutants, contaminants, or hazardous or toxic substances, materials or wastes
whether solid, liquid, or gaseous in nature, into the air, surface water,
groundwater, or land, or relating to the manufacture, processing, distribution,
use, treatment, storage, disposal, transport, or handling of chemical
substances, pollutants, contaminants, or hazardous or toxic substances,
materials, or wastes, whether solid, liquid, or gaseous in nature and all
requirements pertaining to the protection of the health and safety of employees
or the public. "DSC Property" shall mean real estate currently owned, leased, or
otherwise used by DSC, including, without limitation, properties under
foreclosure, but excluding stock investments not requiring consolidation for
accounting or tax purposes. "Tank" shall mean treatment or storage tanks, sumps,
or water, gas or oil wells and associated piping transportation devices.
"Hazardous Materials" shall mean any substance the presence of which requires
investigation or remediation under any federal, state or local statute,
regulation, ordinance, order, action, policy or common law; or which is or
becomes defined as a hazardous waste, hazardous substance, hazardous material,
used oil, pollutant or contaminant under any federal, state or local statute,
regulation, rule or ordinance or amendments thereto including, without
limitation, the Comprehensive Environmental Response, Compensation and Liability
Act (42 U.S.C. Section 9601, et seq.); the Resource Conservation and Recovery
Act (42 U.S.C. Section 6901, et seq.); the Clean Air Act, as amended (42 U.S.C.
Section 7401, et seq.); the Federal Water Pollution Control Act, as amended (33
U.S.C. Section 1251, et seq.); the Toxic Substances Control Act, as amended (15
U.S.C. Section 9601, et seq.); the Occupational Safety and Health Act, as
amended (29 U.S.C. Section 651); the Emergency Planning and Community
Right-to-Know Act of 1986 (42 U.S.C. Section 11001, et seq.); the Mine Safety
and Health Act of 1977, as amended (30 U.S.C. Section 801, et seq.); the Safe
Drinking Water Act (42 U.S.C. Section 300f, et seq.); and all comparable state
and local laws, including without limitation, the Carpenter-Presley-Tanner
Hazardous Substance Account Act (State Superfund), the Porter-Cologne Water
Quality Control Act, Section 25140, 25501(j) and (k), 25501.1, 25281 and 25250.1
of the California Health and Safety Code and/or Article I of Title 22 of the
California Code of Regulations, Division 4, Chapter 30; laws of other
jurisdictions or orders and regulations; or the presence of which causes or
threatens to cause a nuisance trespass or other common law tort upon real
property or adjacent properties or poses or threatens to pose a hazard to the
health or safety of persons or without limitation, which contains gasoline,
diesel fuel or other petroleum hydrocarbons, polychlorinated biphenyls (PCBs),
asbestos or urea formaldehyde foam insulation.
 
     (c) DSC has provided to CWSG phase I environmental assessments with respect
to each interest in real property set forth on the DSC Real Property List as to
which such a phase I environmental investigation has been prepared by or on
behalf of DSC. The DSC Real Property List shall disclose each such property as
to which such an assessment has been prepared on behalf of DSC.
 
     4.13  Performance of Obligations. DSC and each of the DSC Subsidiaries has
performed in all material respects all of the obligations required to be
performed by it to date and is not in default under or in breach of any term or
provision of any covenant, contract, lease, indenture or any other covenant to
which it is a party, is subject or is otherwise bound, and no event has occurred
that, with the giving of notice or the passage of time or both, would constitute
such default or breach, where such default or breach would have a Material
Adverse Effect on DSC. To DSC's knowledge, no party with whom DSC or any of the
DSC Subsidiaries has an agreement that is of material importance to the business
of DSC or any of the DSC Subsidiaries is in default thereunder.
 
                                      -13-
<PAGE>   110
 
     4.14  Employees. Except as set forth on a list furnished by DSC to CWSG
(the "DSC Employment/ Labor Issues List"), there are no controversies pending
or, to DSC's knowledge, threatened on DSC and any of its employees that are
likely to have a Material Adverse Effect on DSC. DSC is not a party to any
collective bargaining agreement with respect to any of its employees or any
labor organization to which its employees or any of them belong.
 
     4.15  Brokers and Finders. Except for the obligation to PaineWebber, as set
forth in the PaineWebber Agreement, a copy of which has been delivered to CWSG,
DSC is not a party to or obligated under any agreement with any broker or finder
relating to the transactions contemplated hereby, and neither the execution of
this Agreement nor the consummation of the transactions provided for herein will
result in any liability to any broker or finder.
 
     4.16  Material Contracts. For the purposes of this Section 4.16, the
contracts, agreements, relationships and commitments referred to in this Section
4.16 include only those contracts, agreements, relationships and commitments
which involve the payment by or to DSC or any of the DSC Subsidiaries, property
of DSC or any of the DSC Subsidiaries, or commitments or expenditures of DSC or
any of the DSC Subsidiaries requiring or having a value of $50,000 or more per
annum. Except as set forth in a list furnished by DSC to CWSG (the "DSC Contract
List") hereto (all items listed or required to be listed in such DSC Contract
List being referred to herein as "DSC Scheduled Contracts"), DSC and each of the
DSC Subsidiaries is not a party or otherwise subject to:
 
          (a) any employment, deferred compensation, bonus or consulting
     contract that (i) has a remaining term, as of the date of this Agreement,
     of more than one year in length of obligation on the part of DSC or any of
     the DSC Subsidiaries and is not terminable by DSC or any of the DSC
     Subsidiaries within one year without penalty or (ii) requires payment by
     DSC or any of the DSC Subsidiaries;
 
          (b) any advertising, brokerage, licensing, dealership, representative
     or agency relationship or contract requiring payment by DSC or any of the
     DSC Subsidiaries;
 
          (c) any contract or agreement that restricts DSC or any of the DSC
     Subsidiaries (or would restrict any Affiliate of DSC or the Surviving
     Corporation (including CWSG and the CWSG Subsidiaries) after the Effective
     Time of the Merger) from competing in any line of business with any Person
     or using or employing the services of any Person;
 
          (d) any lease of real or personal property providing for annual lease
     payments by or to DSC or any of the DSC Subsidiaries other than (i)
     financing leases entered into in the ordinary course of business in which
     DSC or any of the DSC Subsidiaries is lessor and (ii) leases of real
     property presently used by DSC or any of the DSC Subsidiaries as needed in
     its utility operations;
 
          (e) any mortgage, pledge, conditional sales contract, security
     agreement, option, or any other similar agreement with respect to any
     interest of DSC or any of the DSC Subsidiaries (other than as mortgagor or
     pledgor in the ordinary course of its business or as mortgagee, secured
     party or deed of trust beneficiary in the ordinary course of its business)
     in personal property;
 
          (f) other than as described in the DSC Filings or as set forth in the
     DSC Employee Plan List, any stock purchase, stock option, stock bonus,
     stock ownership, profit sharing, group insurance, bonus, deferred
     compensation, severance pay, pension, retirement, savings or other
     incentive, welfare or employment plan or material agreement providing
     benefits to any present or former employees, officers or directors of DSC
     or any of the DSC Subsidiaries;
 
          (g) any agreement to acquire equipment or any commitment to make
     capital expenditures except for (i) any agreement or commitment under any
     DSC approved planned capital budget program, copies of which have been
     furnished by DSC to CWSG and (ii) developer funded projects in accordance
     with the Commission's Tariff Rule 15;
 
          (h) other than agreements entered into in the ordinary course of
     business, including sales of other real estate owned, any agreement for the
     sale of any property or assets in which DSC or any of the DSC
 
                                      -14-
<PAGE>   111
 
     Subsidiaries has an ownership interest or for the grant of any preferential
     right to purchase any such property or asset;
 
          (i) any agreement for the borrowing of any money (other than
     liabilities or borrowings made in the ordinary course of its business and
     reflected in the financial records of DSC and short term bank borrowings
     which have been included in a list furnished by DSC to CWSG (the "DSC Short
     Term Borrowings List"));
 
          (j) any restrictive covenant contained in any deed to or lease of real
     property owned or leased by DSC or any of the DSC Subsidiaries (as lessee)
     that materially restricts the use, transferability or value of such
     property;
 
          (k) any guarantee or indemnification other than letters of credit or
     loan commitments issued in the normal course of business;
 
          (l) any supply contracts that are not terminable by DSC or any of the
     DSC Subsidiaries without penalty on 30 days' or less notice;
 
          (m) other than as disclosed with reference to subparagraph (k) of this
     Section 4.16, any material agreement which would be terminable other than
     by DSC or any of the DSC Subsidiaries as a result of the consummation of
     the transactions contemplated by this Agreement;
 
          (n) any sales of assets of DSC or any of the DSC Subsidiaries with
     recourse of any kind to DSC except the sale of repurchase or reverse
     repurchase agreements, securities or other financial transactions in the
     ordinary course of business;
 
          (o) [deleted];
 
          (p) any contract relating to the provision of data processing services
     to DSC or any of the DSC Subsidiaries; or
 
          (q) any other agreement of any other kind which involves future
     payments or receipts or performances of services or delivery of items.
 
     True copies of all DSC Scheduled Contracts, including all amendments and
supplements thereto, have been delivered to CWSG.
 
     4.17  Certain Material Changes. Except as specifically required, permitted
or effected by this Agreement, since September 30, 1998, or as disclosed in any
DSC List, there has not been, occurred or arisen any of the following (whether
or not in the ordinary course of business unless otherwise indicated):
 
          (a) Any change in any of the assets, liabilities, permits, methods of
     accounting or accounting practices, business, or manner of conducting
     business, of DSC and any of the DSC Subsidiaries or any other event or
     development that has had or may reasonably be expected to have a Material
     Adverse Effect on DSC;
 
          (b) Any damage, destruction or other casualty loss (not covered by
     insurance) that has had or may reasonably be expected to have a Material
     Adverse Effect on DSC;
 
          (c) Any amendment, modification or termination of any existing, or
     entry into any new, material contract or permit that has had or may
     reasonably be expected to have a Material Adverse Effect on DSC;
 
          (d) Any disposition by DSC of an asset the lack of which has had or
     may reasonably be expected to have a Material Adverse Effect on DSC; or
 
          (e) Any direct or indirect redemption, purchase or other acquisition
     by DSC of any equity securities or any declaration, setting aside or
     payment of any dividend (except, in the case of the declaration, setting
     aside or payment of a cash dividend, as disclosed in the Financial
     Statements of DSC) or other distribution on or in respect of DSC Stock
     whether consisting of money, other personal property, real property or
     other things of value.
 
                                      -15-
<PAGE>   112
 
     4.18  Licenses and Permits. DSC and the DSC Subsidiaries have all material
licenses and permits that are necessary for the conduct of its business, and
such licenses are in full force and effect, except for any failure to be in full
force and effect that would not, individually or in the aggregate, have a
Material Adverse Effect on DSC. To DSC's knowledge, the respective properties,
assets, operations and businesses of DSC and each of the DSC Subsidiaries are
and have been maintained and conducted, in all material respects, in compliance
with all applicable licenses and permits. The respective properties and
operations of DSC and each of the DSC Subsidiaries are and have been maintained
and conducted, in all material respects, in compliance with all applicable laws
and regulations.
 
     4.19  Undisclosed Liabilities. To DSC's and each of the DSC Subsidiaries'
knowledge, it has no liabilities or obligations, either accrued or contingent,
that are material to DSC and that have not been: (a) reflected or disclosed in
the Financial Statements of DSC; (b) incurred subsequent to December 31, 1997 in
the ordinary course of business; or (c) disclosed in a list furnished by DSC to
CWSG (the "DSC Undisclosed Liabilities List") or on any other DSC List. To DSC's
knowledge, there exists no basis for the assertion against it of any liability,
obligation or claim (including, without limitation, that of any regulatory
authority) that is likely to result in or cause a Material Adverse Effect on DSC
that is not fairly reflected in the Financial Statements of DSC or otherwise
disclosed in this Agreement.
 
     4.20  Employee Benefit Plans.
 
     (a) DSC has previously made available to CWSG copies of each "employee
benefit plan," as defined in Section 3(3) of ERISA, which is subject to any
provision of ERISA and covers any employee, whether active or retired, of DSC,
together with all amendments thereto, all related summary plan descriptions (to
the extent one is required by law), the determination letter from the IRS, and
the annual reports for the most recent three years (Form 5500 including, if
applicable, Schedule B thereto) prepared in connection with any such plan. Such
plans are hereinafter referred to collectively as the "Employee Plans." DSC does
not participate in an employee benefit pension plan that is a "multiemployer
plan" within the meaning of Section 3(37) of ERISA that would subject DSC to a
material amount of liability with respect to any such plan. Each Employee Plan
which is intended to be qualified in form and operation under Section 401(a) of
the Code is so qualified and the associated trust for each such Employee Plan is
exempt from tax under Section 501(a) of the Code. No event has occurred that
will subject such Employee Plans to a material amount of tax under Section 511
of the Code. All amendments required to bring each Employee Plan into conformity
with all of the applicable provisions of ERISA, the Code and all other
applicable laws have been made. Except as disclosed in a list furnished by DSC
to CWSG (the "DSC Employee Plan List"), all Employee Plans were in effect for
substantially all of 1997, and there has been no material amendment thereof
(other than amendments required to comply with applicable law) or increase in
the cost thereof or benefits thereunder on or after January 1, 1998.
 
     (b) DSC has previously made available to CWSG copies or descriptions of
each plan or Agreement maintained or otherwise contributed to by DSC which is
not an Employee Plan and which (exclusive of base salary and base wages)
provides for any form of current or deferred compensation, bonus, stock option,
profit sharing, benefit, retirement, incentive, group health or insurance,
welfare or similar plan or arrangement for the benefit of any employee or class
of employees, whether active or retired, of DSC (such plans and arrangements
being collectively referred to herein as "Benefit Arrangements"). Except as
disclosed in the DSC Employee Plan List hereto, all Benefit Arrangements which
are in effect were in effect for substantially all of 1997. There has been no
material amendment thereof or increase in the cost thereof or benefits payable
thereunder since January 1, 1998. Except as set forth in the DSC Employee Plan
List, there has been no material increase in the compensation of or benefits
payable to any senior executive employee of DSC since December 31, 1997, nor any
employment, severance or similar contract entered into with any such employee,
nor any amendment to any such contract, since December 31, 1997. There is no
contract, agreement or benefit agreement covering any employee of DSC which
individually or collectively could give rise to the payment of any amount which
would constitute an "excess parachute payment," as such term is defined in
Section 280G of the Code.
 
                                      -16-
<PAGE>   113
 
     (c) With respect to all Employee Plans and Benefit Agreements, DSC is in
material compliance (other than noncompliance the cost or liability for which is
not material) with the requirements prescribed by any and all statutes,
governmental or court orders, or governmental rules or regulations currently in
effect, including but not limited to ERISA and the Code, applicable to such
plans or arrangements. All material government reports and filings required by
law have been properly and timely filed and all information required to be
distributed to participants or beneficiaries has been distributed with respect
to each Employee Plan. DSC has performed all of its obligations under all such
Employee Plans and Benefit Agreements in all material aspects. There is no
pending or, to the knowledge of DSC, threatened legal action, proceeding or
investigation against or involving any Employee Plan or Benefit Agreement which
could result in a material amount of liability to such Employee Plan. To the
knowledge of DSC, no condition exists that could constitute grounds for the
termination of any Employee Plan under Section 4042 of ERISA; no "prohibited
transaction," as defined in Section 406 of ERISA and Section 4975 of the Code,
has occurred with respect to any Employee Plan, or any other employee benefit
plan maintained by DSC which is covered by Title I of ERISA, which could subject
any person (other than a person for whom DSC is not directly or indirectly
responsible) to a material amount of liability under Title I of ERISA or to the
imposition of a material amount of tax under Section 4975 of the Code which
could have a Material Adverse Effect on DSC; nor has any Employee Plan subject
to Part III of Subtitle B of Title I of ERISA or Section 412 of the Code, or
both, incurred any "accumulated funding deficiency," as defined in Section 412
of the Code, whether or not waived, nor has DSC failed to make any contribution
or pay any amount due and owing as required by the terms of any Employee Plan or
Benefit Arrangement. No "reportable event" as defined in ERISA has occurred with
respect to any of the Employee Plans. To the knowledge of DSC, DSC has not
incurred nor expects to incur, directly or indirectly, a material amount of
liability under Title IV of ERISA arising in connection with the termination of,
or a complete or partial withdrawal from, any plan covered or previously covered
by Title IV of ERISA which could constitute a liability of CWSG or of any of its
affiliates (including DSC) at or after the Effective Time of the Merger.
 
     (d) Except for DSC Scheduled Contracts set forth in the DSC Contract List
or as set forth in the DSC Employee Plan List, as the case may be, each Employee
Plan or Benefit Arrangement and each personal services contract, fringe benefit,
consulting contract or similar arrangement with or for the benefit of any
officer, director, employee or other person can be terminated by DSC within a
period of 30 days following the Effective Time of the Merger, without payment of
any amount as a penalty, bonus, premium, severance pay or other compensation for
such termination.
 
     (e) All group health plans of DSC have been operated in compliance with the
group health plan continuation coverage requirements of Section 4980B of the
Code in all material respects.
 
     4.21  Corporate Records. The minute books of DSC and each of the DSC
Subsidiaries since the later of January 1, 1994 or the date which any DSC
Subsidiary became a DSC Subsidiary accurately reflect all material actions taken
from year end 1993 to this date by the respective shareholders, board of
directors and committees of DSC and each of the DSC Subsidiaries.
 
     4.22  Accounting Records. DSC and each of the DSC Subsidiaries maintains
accounting records which fairly and validly reflect, in all material respects,
its transactions, and accounting controls exist sufficient to provide reasonable
assurances that such transactions are, in all material respects, (i) executed in
accordance with its management's general or specific authorization, and (ii)
recorded as necessary to permit the preparation of financial statements in
conformity with generally accepted accounting principles. Such records, to the
extent they contain important information pertaining to DSC and each of the DSC
Subsidiaries which is not easily and readily available elsewhere, have been
duplicated, and such duplicates are stored safely and securely.
 
     4.23  Offices. DSC has furnished to CWSG a list (the "DSC Offices List")
setting forth the headquarters of DSC (identified as such) and each of the
offices maintained and operated by DSC and the location thereof. Except as set
forth on the DSC Offices List, DSC does not maintain any other office or conduct
business at any other location with the exception of offices or locations
utilized as payment facilities.
 
                                      -17-
<PAGE>   114
 
     4.24  Investment Securities. DSC has furnished to CWSG a list (the "DSC
Investment Securities List") (i) setting forth a description of each Investment
Security held by DSC on October 31, 1998. The DSC Investment Securities List
sets forth, with respect to each such Investment Security: (i) the issuer
thereof; (ii) the outstanding balance or number of shares; (iii) the maturity,
if applicable; (iv) the title of issue; and (v) the classification under SFAS
No. 115.
 
     4.25  Power of Attorney. DSC has not granted any Person a power of attorney
or similar authorization that is presently in effect or outstanding.
 
     4.26  Facts Affecting Regulatory Approvals. To the knowledge of DSC, there
is no fact, event or condition applicable to DSC or any of the DSC Subsidiaries
which will, or reasonably could be expected to, adversely affect the likelihood
of securing the requisite approvals or consents of any Governmental Entity to
the Merger and the transactions contemplated by this Agreement. DSC will file
rate cases with the Commission between the effective date of this Agreement and
the Effective Time of the Merger.
 
     4.27  Accounting and Tax Matters. To the best knowledge of DSC, DSC has
not, through the date hereof, taken or agreed to take any action that would
prevent CWSG from accounting for the business combination to be effected by the
Merger as a pooling-of-interests or would prevent the Merger from qualifying as
a tax-free reorganization under the Code.
 
     4.28  Indemnification. Other than pursuant to the provisions of its
Articles of Incorporation or Bylaws and related indemnification agreements
adopted in order to enact those provisions, DSC is not a party to any
indemnification agreement with any of its present officers, directors,
employees, agents or other persons who serve or served in any other capacity
with any other enterprise at the request of DSC (a "Covered Person"), and to the
best knowledge of DSC, there are no claims for which any Covered Person would be
entitled to indemnification by DSC if such provisions were deemed in effect,
except as set forth in a list furnished by DSC to CWSG (the "DSC Indemnification
List").
 
     4.29  Derivative Transactions. DSC is not a party to a transaction in or
involving forwards, futures, options on futures, swaps or other derivative
instruments.
 
     4.30  Disclosure Documents and Applications. None of the information
supplied or to be supplied by or on behalf of DSC or any of the DSC Subsidiaries
("DSC Supplied Information") for inclusion in (a) the Registration Statement on
Form S-4 and the Proxy Statement and Prospectus and (b) any other documents to
be filed with the SEC, the Commission or any other Governmental Entity in
connection with the transactions contemplated in this Agreement, will at the
respective times such documents are filed or become effective, or with respect
to the Proxy Statement and Prospectus when mailed, contain any untrue statement
of a material fact, or omit to state any material fact required to be stated
therein or necessary in order to make the statements therein, in light of the
circumstances under which they were made, not misleading.
 
     4.31  Year 2000 Plan and Compliance. DSC has formulated a plan for
addressing Year 2000 issues (the "Year 2000 Plan"), a copy of which has been
provided to CWSG. Except as disclosed by DSC in a list furnished by DSC to CWSG
(the "DSC Year 2000 Exceptions List"), DSC has been and is in material
compliance with the Year 2000 Plan as in effect on the date hereof.
 
     4.32  Accuracy and Currentness of Information Furnished. The
representations and warranties made by DSC hereby or in the DSC Lists or
schedules hereto do not contain any untrue statement of a material fact or omit
to state any material fact which is necessary under the circumstances under
which they were made to prevent the statements contained herein or therein or in
such schedules from being misleading.
 
     4.33  Standard. No representation or warranty of DSC contained in Article
IV shall be deemed untrue or incorrect, and DSC shall not be deemed to have
breached any such representation or warranty, as a consequence of the existence
of any fact, circumstance or event unless such fact, circumstance or event which
constitutes a breach of any such representation or warranty after giving effect
to any materiality standards contained in any representation or warranty,
individually or taken together with all other facts, circumstances or events
constituting such breaches, has had or would reasonably be expected to have a
Material Adverse Effect on DSC.
 
                                      -18-
<PAGE>   115
 
     4.34  Warn Act. Prior to the date of this Agreement, DSC has not
effectuated (a) a "plant closing" (as defined in the WARN Act) affecting any
site of employment or one or more facilities or operating units within any site
of employment or facility of DSC; or (b) a "mass layoff" (as defined in the WARN
Act) affecting any site of employment or one or more facilities or operating
units within any site of employment or facility of DSC. DSC has not been
affected by any transaction or engaged in layoffs or employment termination with
respect to its business sufficient in number to trigger application of any
similar state or local law. None of DSC's employees who are employed in
connection with its business has suffered an "employment loss" (as defined in
the WARN Act).
 
                                   ARTICLE V
 
                     REPRESENTATIONS AND WARRANTIES OF CWSG
 
     CWSG represents and warrants to DSC with respect to CWSG, its predecessors
in interest and the CWSG Subsidiaries as follows:
 
     5.1  Incorporation, Standing and Power. CWSG and each of the CWSG
Subsidiaries have been duly organized, are validly existing and in good standing
as corporations under the laws of the State of California. CWSG intends to
reincorporate into Delaware, which reincorporation is anticipated to occur prior
to the Effective Time of the Merger. CWSG and each of the CWSG Subsidiaries have
all requisite corporate power and authority to own, lease and operate their
respective properties and assets and to carry on their respective businesses as
presently conducted. CWSG and each of the CWSG Subsidiaries are duly qualified
and in good standing as foreign corporations, and are authorized to do business,
in all states or other jurisdictions in which such qualification or
authorization is necessary, except where the failure to be so qualified or
authorized would not, individually or in the aggregate, have a Material Adverse
Effect on CWSG. True and correct copies of the Articles of Incorporation and
Bylaws of each of CWSG and each of the CWSG Subsidiaries have been delivered to
DSC. Such Articles of Incorporation and Bylaws are in full force and effect as
of the date hereof. Water Company has not engaged in any business nor has it
incurred any liabilities or obligations since it was incorporated other than
relating to this Agreement and the transactions contemplated hereby.
 
     5.2  Capitalization.
 
     (a) As of the date of this Agreement, the authorized capital stock of CWSG
consists of 25,000,000 shares of Common Stock, of which 12,619,140 shares are
outstanding and 380,000 shares of Preferred Stock, of which 139,000 shares of
$25 par value cumulative, 4.4% Series C preferred shares are outstanding. All of
the outstanding shares of CWSG Stock are duly authorized, validly issued, fully
paid and nonassessable. The CWSG Stock to be used in the Merger will be duly
authorized, validly issued, fully paid and nonassessable.
 
     (b) As of the date of this Agreement, the authorized capital stock of Water
Company consists of 8,000,000 shares of Common Stock and 380,000 shares of
preferred stock, of which 6,309,570 shares of the Common Stock are outstanding
and owned of record and beneficially by CWSG. All the outstanding shares of such
Common Stock are duly authorized, validly issued, fully paid and nonassessable.
There are no outstanding options, warrants or other rights in or with respect to
the unissued shares of such Common Stock or any other securities convertible
into such stock, and Water Company is not obligated to issue any additional
shares of its Common Stock or any options, warrants or other rights in or with
respect to the unissued shares of its Common Stock or any other securities
convertible into such stock.
 
     5.3  Financial Statements. CWSG has previously furnished to DSC a copy of
the Financial Statements of CWSG. The Financial Statements of CWSG: (a) present
fairly and in all material respects the consolidated financial condition of CWSG
and the CWSG Subsidiaries as of the respective dates indicated and its
consolidated results of operations and statement of cash flows, as applicable,
for the respective periods then ended, subject, in the case of the unaudited
consolidated interim financial statements, to normal recurring adjustments; (b)
have been prepared in accordance with generally accepted accounting principles
consistently applied (except as otherwise indicated therein); and (c) are based
upon the books and records of CWSG.
 
                                      -19-
<PAGE>   116
 
     5.4  Reports and Filings. Except as set forth in a list (the "CWSG Filings
List"), since the later of December 31, 1994, or the date which any CWSG
Subsidiary became a CWSG Subsidiary, CWSG and each CWSG Subsidiary has filed all
reports, returns, registrations and statements (such reports and filings
referred to as "CWSG Filings") together with any amendments required to be made
with respect thereto, that were required to be filed with the SEC, the
Commission, and any other applicable Governmental Entity, including taxing
authorities, except where the failure to file such reports, returns,
registrations or statements has not had and is not reasonably expected to have a
Material Adverse Effect on CWSG on a consolidated basis. No administrative
actions have been taken or orders issued in connection with such CWSG Filings.
As of their respective dates, each of such CWSG Filings (y) complied in all
material respects with all laws and regulations enforced or promulgated by the
Governmental Entity with which it was filed (or was amended so as to be in such
compliance promptly following discovery of any such noncompliance; and (z) did
not contain any untrue statement of a material fact or omit to state a material
fact required to be stated therein or necessary to make the statements therein,
in light of the circumstances under which they were made, not misleading. Any
financial statement contained in any of such CWSG Filings that was intended to
present the financial position of CWSG on a consolidated basis fairly presented
the financial position of CWSG on a consolidated basis and was prepared in
accordance with generally accepted accounting principles consistently applied,
except as stated therein, during the periods involved. CWSG has furnished or
made available to DSC true and correct copies of all CWSG Filings filed by CWSG
since January 1, 1994.
 
     5.5  Authority.
 
     (a) Of CWSG. The execution and delivery by CWSG of this Agreement and the
consummation of the transactions contemplated hereby have been duly and validly
authorized by all necessary corporate action on the part of CWSG, and this
Agreement will be upon execution and delivery by the respective parties hereto,
a valid and binding obligation of CWSG enforceable in accordance with its terms,
except as the enforceability thereof may be limited by bankruptcy, liquidation,
receivership, conservatorship, insolvency, moratorium or other similar laws
affecting the rights of creditors generally and by general equitable principles.
Except as set forth in a list furnished by CWSG to DSC (the "CWSG Conflicts and
Consents List"), neither the execution and delivery by CWSG of this Agreement,
the consummation of the transactions contemplated herein, nor compliance by CWSG
with any of the provisions hereof or thereof, will: (a) conflict with or result
in a breach of any provision of its Articles of Incorporation, as amended, or
Bylaws, as amended; (b) constitute a breach of or result in a default (or give
rise to any rights of termination, cancellation or acceleration, or any right to
acquire any securities or assets) under any of the terms, conditions or
provisions of any note, bond, mortgage, indenture, franchise, license, permit,
agreement or other instrument or obligation to which CWSG or any CWSG Subsidiary
is a party, or by which CWSG or any CWSG Subsidiary or any of its respective
properties or assets is bound, or require the approval or consent of any third
party; (c) result in the creation or imposition of any Encumbrance on any of the
properties or assets of CWSG or any CWSG Subsidiary; or (d) violate any order,
writ, injunction, decree, statute, rule or regulation applicable to CWSG or any
CWSG Subsidiary or any of their respective properties or assets. Except as set
forth in the CWSG Conflicts and Consents List, no consent of, approval of,
notice to or filing with any Governmental Entity having jurisdiction over any
aspect of the business or assets of CWSG, and no consent of, approval of or
notice to any other Person is required in connection with the execution and
delivery by CWSG of this Agreement or the Agreement of Merger, or the
consummation by CWSG of the Merger or the transactions contemplated hereby or
thereby, except (i) such approvals as may be required by the SEC, the
Commission, the United States Department of Justice and Federal Trade
Commission; (ii) filing of the Agreement of Merger with the Secretary of State
of the State of California; (iii) such approvals as may be required by the New
York Stock Exchange of listing of the CWSG Stock to be issued in the Merger; and
(iv) the filing of pre-merger notification reports by DSC and CWSG under the
Hart-Scott-Rodino Antitrust Improvements Act (1976), as amended.
 
     (b) Of Water Company. The execution and delivery by Water Company of this
Agreement and the Agreement of Merger and the consummation of the transactions
contemplated thereby, will be duly and validly authorized by all necessary
corporate action on the part of Water Company, and this Agreement and the
Agreement of Merger will be, upon due execution and delivery by the respective
parties, a valid and binding obligation of Water Company enforceable in
accordance with its terms, except as the enforceability
 
                                      -20-
<PAGE>   117
 
thereof may be limited by bankruptcy, liquidation, receivership,
conservatorship, insolvency, moratorium or other similar laws affecting the
rights of creditors generally and by general equitable principles. Neither the
consummation of the transactions contemplated by this Agreement and the
Agreement of Merger, nor compliance by Water Company with any of the provisions
hereof or thereof, will: (a) conflict with or result in a breach of any
provision of its Articles of Incorporation, or Bylaws; (b) constitute a breach
of or result in a default (or give rise to any rights of termination,
cancellation or acceleration, or any right to acquire any securities or assets)
under any of the terms, conditions or provisions of any note, bond, mortgage,
indenture, franchise, license, permit, agreement or other instrument or
obligation to which Water Company is a party, or by which Water Company or any
of its properties or assets is bound, or require the approval or consent of any
third party; (c) result in the creation or imposition of any Encumbrance on any
of the properties or assets of Water Company; or (d) violate any order, writ,
injunction, decree, statute, rule or regulation applicable to Water Company or
any of its properties or assets. No consent of, approval of, notice to or filing
with any Governmental Entity having jurisdiction over any aspect of the business
or assets of Water Company, and no consent of, approval of or notice to any
other Person, is required in connection with the execution and delivery by Water
Company of this Agreement or the Agreement of Merger or the consummation by
Water Company of the transactions contemplated hereby or thereby, except (i) the
approval of the Agreement of Merger and the transactions contemplated hereby by
the shareholders and directors of Water Company; (ii) such approvals as may be
required by the SEC, the Commission or any other Governmental Authority; (iii)
filing of the Agreement of Merger with the Secretary of State of the State of
California; and (iv) the filing of pre-merger notification reports by DSC and
CWSG under the Hart-Scott-Rodino Antitrust Improvements Act (1976), as amended.
 
     5.6  CWSG Subsidiaries. As of the date of this Agreement, CWSG owns 100% of
the outstanding stock of Water Company and of CWS Utility Services. As of the
date of this Agreement, and except for its investments in CWS Utility Services
and Water Company, CWSG does not own, directly or indirectly, more than one
percent (1%) of the outstanding stock or equity or other voting interest in any
other corporation, partnership, joint venture, limited liability company or
other entity.
 
     5.7  Brokers and Finders. Except for the obligation to A.G. Edwards & Sons,
Inc., as set forth in the A.G. Edwards Agreement, a copy of which has been
delivered to DSC, CWSG is not a party to or obligated under any agreement with
any broker or finder relating to the transactions contemplated hereby, and
neither the execution of this Agreement nor the consummation of the transactions
provided for herein will result in any liability to any broker or finder.
 
     5.8  Certain Material Changes. Except as specifically required, permitted
or effected by this Agreement, or as disclosed in any CWSG Filings, since
September 30, 1998, or as disclosed in any CWSG List, there has not been,
occurred or arisen any of the following (whether or not in the ordinary course
of business unless otherwise indicated):
 
          (a) Any change in any of the assets, liabilities, permits, methods of
     accounting or accounting practices, business, or manner or conducting
     business, of CWSG and any of the CWSG Subsidiaries or any other event or
     development that has had or may reasonably be expected to have a Material
     Adverse Effect on CWSG;
 
          (b) Any damage, destruction or other casualty loss (not covered by
     insurance) that has had or may reasonably be expected to have a Material
     Adverse Effect on CWSG;
 
          (c) Any amendment, modification or termination of any existing, or
     entry into any new, material contract or permit that has had or may
     reasonably be expected to have a Material Adverse Effect on CWSG; or
 
          (d) Any disposition by CWSG of an asset the lack of which has had or
     may reasonably be expected to have a Material Adverse Effect on CWSG.
 
     5.9  Licenses and Permits. CWSG and each of the CWSG Subsidiaries have all
material licenses and permits that are necessary for the conduct of their
respective businesses, and such licenses are in full force and effect, except
for any failure to be in full force and effect that would not, individually or
in the aggregate, have
 
                                      -21-
<PAGE>   118
 
a Material Adverse Effect on CWSG on a consolidated basis. To CWSG's knowledge,
the respective properties, assets, operations and businesses of CWSG and each
CWSG Subsidiary are and have been maintained and conducted, in all material
respects, in compliance with all applicable licenses and permits. The properties
and operations of CWSG and each of the CWSG Subsidiaries are and have been
maintained and conducted, in all material respects, in compliance with all
applicable laws and regulations.
 
     5.10  Corporate Records. The minute books of CWSG and each of the CWSG
Subsidiaries since the later of January 1, 1994 or the date which any CWSG
Subsidiary became a CWSG Subsidiary accurately reflect all material actions
taken from year end 1993 to this date by the respective shareholders, board of
directors and committees of CWSG and each of the CWSG Subsidiaries.
 
     5.11  Accounting Records. CWSG and each of the CWSG Subsidiaries maintain
accounting records which fairly and validly reflect, in all material respects,
their transactions, and accounting controls exist sufficient to provide
reasonable assurances that such transactions are, in all material respects, (i)
executed in accordance with their management's general or specific
authorization, and (ii) recorded as necessary to permit the preparation of
financial statements in conformity with generally accepted accounting
principles. Such records, to the extent they contain important information
pertaining to CWSG and each of the CWSG Subsidiaries which is not easily and
readily available elsewhere, have been duplicated, and such duplicates are
stored safely and securely.
 
     5.12  Facts Affecting Regulatory Approvals. To the knowledge of CWSG, there
is no fact, event or condition applicable to CWSG or any of the CWSG
Subsidiaries which will, or reasonably could be expected to, adversely affect
the likelihood of securing the requisite approvals or consents of any
Governmental Entity to the Merger and transactions contemplated by this
Agreement.
 
     5.13  Accounting and Tax Matters. To the best of CWSG's knowledge, CWSG has
not through the date hereof taken or agreed to take any action that would
prevent it from accounting for the business combination to be effected by the
Merger as a pooling of interests or that would prevent the Merger from
qualifying as a reorganization under Section 368 the Code.
 
     5.14  Disclosure Documents and Applications. None of the information
supplied or to be supplied by or on behalf of CWSG or any of the CWSG
Subsidiaries ("CWSG Supplied Information") for inclusion in (a) the Registration
Statement on Form S-4 and the Proxy Statement and Prospectus to be mailed to the
shareholders of DSC in connection with obtaining the approval of the
shareholders of DSC of this Agreement, the Merger and the other transactions
contemplated hereby, and (b) any other documents to be filed with the SEC, the
Commission or any other Governmental Entity in connection with the transactions
contemplated in this Agreement, will, at the respective times such documents are
filed or become effective, or with respect to the Proxy Statement and Prospectus
when mailed, contain any untrue statement of a material fact, or omit to state
any material fact required to be stated therein or necessary in order to make
the statements therein, in light of the circumstances under which they were
made, not misleading.
 
     5.15  New York Stock Exchange Listing. As of the date hereof, CWSG Stock is
listed and trades on the New York Stock Exchange under the symbol "CWT." To the
knowledge of CWSG, there is nothing which would prevent the shares to be issued
to DSC's shareholders from being registered and listed on the New York Stock
Exchange.
 
     5.16  Litigation. Except as set forth in the CWSG Filings or in a list
furnished by CWSG to DSC (the "CWSG Litigation List"), there is no private or
governmental suit, claim, action or proceeding pending, nor to CWSG's knowledge
threatened, against CWSG or any of the CWSG Subsidiaries or against any of their
respective directors, officers or employees relating to the performance of their
duties in such capacities or against or affecting any properties of CWSG or any
of the CWSG Subsidiaries which, if adversely determined, would have a Material
Adverse Effect on CWSG or the transactions contemplated hereby, or which could
reasonably be expected to involve a judgment against CWSG in excess of $50,000.
Also, except as disclosed in the CWSG Filings or in the CWSG Litigation List,
there are no material judgments, decrees, stipulations or orders against CWSG or
enjoining its directors, officers or employees in respect of, or the effect of
which is to prohibit, any business practice or the acquisition of any property
or the conduct of business in any area.
 
                                      -22-
<PAGE>   119
 
     5.17  Compliance with Laws and Regulations.
 
     (a) CWSG and each of the CWSG Subsidiaries is not in default under or in
breach of any provision of its Articles of Incorporation, as amended, or Bylaws,
as amended, or law, ordinance, rule or regulation promulgated by any
Governmental Entity, where such default or breach would have a Material Adverse
Effect on CWSG.
 
     (b) Without limiting Section 5.17(a), to the knowledge of CWSG and except
as set forth on a list furnished by CWSG to DSC (the "CWSG Environmental
Compliance List") (i) CWSG and each of the CWSG Subsidiaries is in compliance
with all Environmental Regulations; (ii) there are no Tanks on or about CWSG
Property or any of the CWSG Subsidiaries' Property; (iii) except for Hazardous
Materials properly maintained in accordance with Environmental Regulations,
there are no Hazardous Materials on, below or above the surface of, or migrating
to or from CWSG Property or any of the CWSG Subsidiaries' Property; and (iv)
without limiting Section 5.16 or the foregoing representations and warranties
contained in clauses (i) through (iii), as of the date of this Agreement, there
is no claim, action, suit, or proceeding or notice thereof before any
Governmental Entity pending against CWSG or concerning property securing CWSG
loans and there is no outstanding judgment, order, writ, injunction, decree, or
award against or affecting CWSG Property or property securing CWSG loans,
relating to the foregoing representations (i) through (iii), in each case the
noncompliance with which, or the presence of which would have a Material Adverse
Effect on CWSG. For purposes of this Section 5.17(b), the term "Environmental
Regulations" shall mean all applicable statutes, regulations, rules, ordinances,
codes, licenses, permits, orders, approvals, plans, authorizations, concessions,
franchises, and similar items, of all Governmental Entities and all applicable
judicial, administrative, and regulatory decrees, judgments, and orders relating
to the protection of human health or the environment, including, without
limitation: all requirements, including, but not limited to those pertaining to
reporting, licensing, permitting, investigation, and remediation of emissions,
discharges, releases, or threatened releases of Hazardous Materials, chemical
substances, pollutants, contaminants, or hazardous or toxic substances,
materials or wastes whether solid, liquid, or gaseous in nature, into the air,
surface water, groundwater, or land, or relating to the manufacture, processing,
distribution, use, treatment, storage, disposal, transport, or handling of
chemical substances, pollutants, contaminants, or hazardous or toxic substances,
materials, or wastes, whether solid, liquid, or gaseous in nature and all
requirements pertaining to the protection of the health and safety of employees
or the public. "CWSG Property" shall mean real estate currently owned, leased,
or otherwise used by CWSG, including, without limitation, properties under
foreclosure, but excluding stock investments not requiring consolidation for
accounting or tax purposes. "Tank" shall mean treatment or storage tanks, sumps,
or water, gas or oil wells and associated piping transportation devices.
"Hazardous Materials" shall mean any substance the presence of which requires
investigation or remediation under any federal, state or local statute,
regulation, ordinance, order, action, policy or common law; or which is or
becomes defined as a hazardous waste, hazardous substance, hazardous material,
used oil, pollutant or contaminant under any federal, state or local statute,
regulation, rule or ordinance or amendments thereto including, without
limitation, the Comprehensive Environmental Response, Compensation and Liability
Act (42 U.S.C. Section 9601, et seq.); the Resource Conservation and Recovery
Act (42 U.S.C. Section 6901, et seq.); the Clean Air Act, as amended (42 U.S.C.
Section 7401, et seq.); the Federal Water Pollution Control Act, as amended (33
U.S.C. Section 1251, et seq.); the Toxic Substances Control Act, as amended (15
U.S.C. Section 9601, et seq.); the Occupational Safety and Health Act, as
amended (29 U.S.C. Section 651); the Emergency Planning and Community
Right-to-Know Act of 1986 (42 U.S.C. Section 11001, et seq.); the Mine Safety
and Health Act of 1977, as amended (30 U.S.C. Section 801, et seq.); the Safe
Drinking Water Act (42 U.S.C. Section 300f, et seq.); and all comparable state
and local laws, including without limitation, the Carpenter-Presley-Tanner
Hazardous Substance Account Act (State Superfund), the Porter-Cologne Water
Quality Control Act, Section 25140, 25501(j) and (k), 25501.1, 25281 and 25250.1
of the California Health and Safety Code and/or Article I of Title 22 of the
California Code of Regulations, Division 4, Chapter 30; laws of other
jurisdictions or orders and regulations; or the presence of which causes or
threatens to cause a nuisance trespass or other common law tort upon real
property or adjacent properties or poses or threatens to pose a hazard to the
health or safety of persons or without limitation, which contains gasoline,
diesel fuel or other petroleum hydrocarbons, polychlorinated biphenyls (PCBs),
asbestos or urea formaldehyde foam insulation.
 
                                      -23-
<PAGE>   120
 
     (c) CWSG has provided to DSC phase I environmental assessments with respect
to each interest in real property set forth on the CWSG Real Property List as to
which such a phase I environmental investigation has been prepared by or on
behalf of CWSG. The CWSG Real Property List shall disclose each such property as
to which such an assessment has been prepared on behalf of CWSG.
 
     5.18  Performance of Obligations. CWSG and each of the CWSG Subsidiaries
has performed in all material respects all of the obligations required to be
performed by it to date and is not in default under or in breach of any term or
provision of any covenant, contract, lease, indenture or any other covenant to
which it is a party, is subject or is otherwise bound, and no event has occurred
that, with the giving of notice or the passage of time or both, would constitute
such default or breach, where such default or breach would have a Material
Adverse Effect on CWSG. To CWSG's knowledge, no party with whom CWSG or any of
the CWSG Subsidiaries has an agreement that is of material importance to the
business of CWSG or any of the CWSG Subsidiaries is in default thereunder.
 
     5.19  Material Contracts. For the purposes of this Section 5.19, the
contracts, agreements, relationships and commitments referred to in this Section
5.19 include only those contracts, agreements, relationships and commitments
which involve the payment by or to CWSG or any of the CWSG Subsidiaries,
property of CWSG or any of the CWSG Subsidiaries, or commitments or expenditures
of CWSG or any of the CWSG Subsidiaries requiring or having a value of $500,000
or more per annum. Except as set forth in a list furnished by CWSG to DSC (the
"CWSG Contract List") hereto (all items listed or required to be listed in such
CWSG Contract List being referred to herein as "CWSG Scheduled Contracts"), CWSG
and each of the CWSG Subsidiaries is not a party or otherwise subject to:
 
          (a) any employment, deferred compensation, bonus or consulting
     contract that (i) has a remaining term, as of the date of this Agreement,
     of more than one year in length of obligation on the part of CWSG or any of
     the CWSG Subsidiaries and is not terminable by CWSG or any of the CWSG
     Subsidiaries within one year without penalty or (ii) requires payment by
     CWSG or any of the CWSG Subsidiaries;
 
          (b) any advertising, brokerage, licensing, dealership, representative
     or agency relationship or contract requiring payment by CWSG or any of the
     CWSG Subsidiaries;
 
          (c) any contract or agreement that restricts CWSG or any of the CWSG
     Subsidiaries (or would restrict any Affiliate of CWSG or the Surviving
     Corporation (including CWSG and the CWSG Subsidiaries) after the Effective
     Time of the Merger) from competing in any line of business with any Person
     or using or employing the services of any Person;
 
          (d) any lease of real or personal property providing for annual lease
     payments by or to CWSG or any of the CWSG Subsidiaries other than (i)
     financing leases entered into in the ordinary course of business in which
     CWSG or any of the CWSG Subsidiaries is lessor and (ii) leases of real
     property presently used by CWSG or any of the CWSG Subsidiaries as needed
     in its utility operations;
 
          (e) any mortgage, pledge, conditional sales contract, security
     agreement, option, or any other similar agreement with respect to any
     interest of CWSG or any of the CWSG Subsidiaries (other than as mortgagor
     or pledgor in the ordinary course of its business or as mortgagee, secured
     party or deed of trust beneficiary in the ordinary course of its business)
     in personal property;
 
          (f) other than as described in the CWSG Filings, any stock purchase,
     stock option, stock bonus, stock ownership, profit sharing, group
     insurance, bonus, deferred compensation, severance pay, pension,
     retirement, savings or other incentive, welfare or employment plan or
     material agreement providing benefits to any present or former employees,
     officers or directors of CWSG or any of the CWSG Subsidiaries;
 
          (g) any agreement to acquire equipment or any commitment to make
     capital expenditures except for (i) any agreement or commitment under any
     CWSG approved planned capital budget program, copies of which have been
     furnished by CWSG to DSC and (ii) developer funded projects in accordance
     with Commission Tariff Rule 15;
 
                                      -24-
<PAGE>   121
 
          (h) other than agreements entered into in the ordinary course of
     business, including sales of other real estate owned, any agreement for the
     sale of any property or assets in which CWSG or any of the CWSG
     Subsidiaries has an ownership interest or for the grant of any preferential
     right to purchase any such property or asset;
 
          (i) any agreement for the borrowing of any money (other than
     liabilities or borrowings made in the ordinary course of its business and
     reflected in the financial records of CWSG and short term bank borrowings
     which have been included in a list furnished by CWSG to DSC (the "CWSG
     Short Term Borrowings List"));
 
          (j) any restrictive covenant contained in any deed to or lease of real
     property owned or leased by CWSG or any of the CWSG Subsidiaries (as
     lessee) that materially restricts the use, transferability or value of such
     property;
 
          (k) any guarantee or indemnification other than letters of credit or
     loan commitments issued in the normal course of business;
 
          (l) any supply contracts that are not terminable by CWSG or any of the
     CWSG Subsidiaries without penalty on 30 days' or less notice;
 
          (m) other than as disclosed with reference to subparagraph (k) of this
     Section 5.19, any material agreement which would be terminable other than
     by CWSG or any of the CWSG Subsidiaries as a result of the consummation of
     the transactions contemplated by this Agreement;
 
          (n) any sales of assets of CWSG or any of the CWSG Subsidiaries with
     recourse of any kind to CWSG except the sale of repurchase or reverse
     repurchase agreements, securities or other financial transactions in the
     ordinary course of business;
 
          (o) [deleted];
 
          (p) any contract relating to the provision of data processing services
     to CWSG or any of the CWSG Subsidiaries; or
 
          (q) any other agreement of any other kind which involves future
     payments or receipts or performances of services or delivery of items.
 
     True copies of all CWSG Scheduled Contracts, including all amendments and
supplements thereto, have been delivered to DSC.
 
     5.20  Undisclosed Liabilities. To CWSG and each of the CWSG Subsidiaries'
knowledge, it has no liabilities or obligations, either accrued or contingent,
that are material to CWSG and that have not been: (a) reflected or disclosed in
the Financial Statements of CWSG; (b) incurred subsequent to December 31, 1997
in the ordinary course of business; or (c) disclosed in a list furnished by CWSG
to DSC (the "CWSG Undisclosed Liabilities List") or on any other CWSG List. To
CWSG's knowledge, there exists no basis for the assertion against it of any
liability, obligation or claim (including, without limitation, that of any
regulatory authority) that is likely to result in or cause a Material Adverse
Effect on CWSG that is not fairly reflected in the Financial Statements of CWSG
or otherwise disclosed in this Agreement.
 
     5.21  Year 2000 Plan and Compliance. CWSG has formulated a plan for
addressing Year 2000 issues (the "Year 2000 Plan"), a copy of which has been
provided to DSC. Except as disclosed by CWSG in a list furnished by CWSG to DSC
(the "CWSG Year 2000 Exceptions List"), CWSG has been and is in material
compliance with the Year 2000 Plan as in effect on the date hereof.
 
     5.22  Accuracy and Currentness of Information Furnished. The
representations and warranties made by CWSG hereby or in the CWSG Lists or
Schedules hereto do not contain any untrue statement of material fact or omit to
state any material fact which is necessary under the circumstances under which
they were made to prevent the statements contained herein or therein or in such
schedules from being misleading.
 
     5.23  Standard. No representation or warranty of CWSG contained in Article
V shall be deemed untrue or incorrect, and CWSG shall not be deemed to have
breached any such representation or warranty, as
 
                                      -25-
<PAGE>   122
 
a consequence of the existence of any fact, circumstance or event unless such
fact, circumstance or event which constitutes a breach of any such
representation or warranty after giving effect to any materiality standards
contained in any representation or warranty, individually or taken together with
all other facts, circumstances or events constituting such breaches, has had or
would reasonably be expected to have a Material Adverse Effect on CWSG.
 
                                   ARTICLE VI
 
                                COVENANTS OF DSC
                      PENDING EFFECTIVE TIME OF THE MERGER
 
     DSC covenants and agrees with CWSG and Water Company as follows:
 
     6.1  Limitation on DSC's Conduct Prior to Effective Time of the Merger.
Between the date hereof and the Effective Time of the Merger, except as
contemplated by this Agreement and subject to requirements of law and regulation
generally applicable to California corporations, DSC and each of the DSC
Subsidiaries agrees to conduct its business in the ordinary course in
substantially the manner heretofore conducted and in accordance with sound
business practices, and DSC and each of the DSC Subsidiaries shall not, without
the prior written consent of CWSG, which consent, except with respect to Section
6.1(n) below, shall not be unreasonably withheld and which consent shall be
deemed granted if within five (5) Business Days of CWSG's receipt of written
notice of a request for prior written consent, written notice of objection is
not received by DSC;
 
          (a) issue, sell or grant any DSC Stock (except pursuant to the
     exercise of DSC Options outstanding as of the date hereof and except with
     respect to those pending acquisitions and other acquisitions that may
     develop prior to the Effective Time of the Merger by DSC of water systems
     or companies within a radius of fifty (50) miles of DSC's current
     operations and having three hundred (300) or fewer customers as described
     in a list furnished by DSC to CWSG (the "DSC Pending Acquisitions List")),
     any other securities (including long term debt) of DSC, or any rights,
     options or securities to acquire any DSC Common Stock, or any other
     securities (including long term debt) of DSC;
 
          (b) declare, set aside or pay any dividend or make any other
     distribution upon or split, combine or reclassify any shares of capital
     stock or other securities of DSC, provided, however, that subject to
     Section 6.11, DSC may pay to its shareholders its regular cash dividend in
     amounts consistent with past practices;
 
          (c) purchase, redeem or otherwise acquire any capital stock or other
     securities of DSC or any rights, options, or securities to acquire any
     capital stock or other securities of DSC;
 
          (d) except as may be required to effect the transactions contemplated
     herein, amend its Articles of Incorporation or Bylaws;
 
          (e) grant any general or uniform increase in the rate of pay of
     employees or employee benefits except in the ordinary course of business
     and consistent with past practice;
 
          (f) grant any increase in salary, incentive compensation or employee
     benefits or pay any bonus to any Person or voluntarily accelerate the
     vesting of any employee benefits (other than the acceleration and vesting
     of stock options outstanding on the date of this Agreement upon the
     Effective Time of the Merger), except for annual salary increases of not
     more than three and one half percent (3.5%) in the aggregate which shall
     not be in the form of stock options and shall only be granted in the
     ordinary course of business and consistent with past practices or as
     required by an existing written employment agreement or pursuant to the
     1996 DSC Bonus Plan as approved by the Board of Directors (the "DSC Bonus
     Plan"), as amended; provided, however, that payment of the Transaction
     Expenses shall not be considered in the determination of bonus payments
     pursuant to the DSC Bonus Plan;
 
          (g) make any capital expenditure or commitments with respect thereto
     in excess of $50,000 in the aggregate, except for (i) ordinary repairs,
     renewals, replacements, (ii) any agreement or commitment
 
                                      -26-
<PAGE>   123
 
     under any DSC approved planned capital budget program, copies of which have
     been furnished by DSC to CWSG, and (iii) developer funded projects in
     accordance with the Commission's Tariff Rule 15;
 
          (h) compromise or otherwise settle or adjust any assertion or claim of
     a deficiency in taxes (or interest thereon or penalties in connection
     therewith), extend the statute of limitations with any tax authority or
     file any pleading in court in any tax litigation or any appeal from an
     asserted deficiency, or file or amend any federal, foreign, state or local
     tax return, or make any tax election;
 
          (i) [deleted];
 
          (j) change its tax or accounting policies and procedures or any method
     or period of accounting unless required by generally accepted accounting
     principles or a Governmental Entity;
 
          (k) [deleted];
 
          (l) close any offices at which business is conducted or open any new
     offices except those new offices being opened in connection with any
     pending acquisition;
 
          (m) adopt or enter into any new employment agreement or other employee
     benefit plan or arrangement or amend or modify any employment agreement or
     employee benefit plan or arrangement of any such type except for such
     amendments as are required by law;
 
          (n) initiate, solicit or encourage (including by way of furnishing
     information or assistance), or take any other action to facilitate, any
     inquiries or the making of any proposal which constitutes, or may
     reasonably be expected to lead to, any Competing Transaction (as such term
     is defined below), or negotiate with any person in furtherance of such
     inquiries or to obtain a Competing Transaction, or agree to or endorse any
     Competing Transaction, or authorize or permit any of its officers,
     directors or employees or any investment banker, financial advisor,
     attorney, accountant or any other representative retained by it or any of
     its Affiliates to take any such action, and DSC shall promptly notify CWSG
     (orally and in writing) of all of the relevant details relating to all
     inquiries and proposals which it may receive relating to any of such
     matters; provided, however, that notwithstanding any other provision
     hereof, DSC may engage in discussions or negotiations with a third party
     who (without any solicitation, initiation, encouragement, discussion or
     negotiation, directly or indirectly, by or with the party or its authorized
     representatives after the date hereof) seeks to initiate such discussions
     or negotiations and furnish such third party information concerning itself
     and its business, properties and assets, and may accept a Competing
     Transaction proposal from such third party if, and only to the extent that
     such third party shall first have made an unsolicited Competing Transaction
     proposal to DSC that the Board of Directors of DSC reasonably believes in
     good faith may be a Superior Proposal (as such term is defined below).
     Furthermore, nothing contained herein shall prohibit DSC from taking and
     disclosing to its shareholders a position on any takeover proposal
     contemplated by Rule 14e-2(a) of the Exchange Act.
 
          For purposes of this Agreement, "Competing Transaction" shall mean any
     of the following involving DSC: (i) any merger, consolidation, share
     exchange involving fifty percent (50%) or more of the voting power of DSC
     or other business combination; (ii) a sale, lease, exchange, mortgage,
     pledge, transfer or other disposition of assets of DSC representing thirty
     percent (30%) or more of the assets of DSC; (iii) a sale by DSC of shares
     of capital stock (or securities convertible or exchangeable into or
     otherwise evidencing, or any agreement or instrument evidencing, the right
     to acquire capital stock), representing thirty percent (30%) or more of the
     voting power of DSC; (iv) a tender offer or exchange offer for at least
     fifty percent (50%) of the outstanding shares of DSC; (v) a solicitation of
     proxies in opposition to approval of the Merger by DSC's shareholders; (vi)
     or a public announcement of an unsolicited bona fide proposal, plan, or
     intention to do any of the foregoing. Notwithstanding any other provision
     in this Section 6.1(n) or elsewhere in this Agreement, the obligations of
     DSC in this Agreement are subject to the continuing fiduciary duties of the
     Board of Directors of DSC to the shareholders of DSC. In addition, if the
     Board of Directors of DSC receives a bona fide proposal for a Competing
     Transaction which it has determined to be a Superior Proposal, the Board of
     Directors may withdraw or modify its approval or recommendation of this
     Agreement or the Merger and may terminate this Agreement, in each case at
     any time after the fifth (5th) business day following CWSG's receipt of
     written notice advising CWSG that
 
                                      -27-
<PAGE>   124
 
     the Board of Directors of DSC has received a Superior Proposal, specifying
     the material terms and conditions of such Superior Proposal and identifying
     the person making such Superior Proposal.
 
          For purposes of this Agreement, a "Superior Proposal" means a
     Competing Transaction for consideration consisting of cash and/or
     securities and otherwise on terms and conditions which a majority of the
     members of the Board of Directors of DSC determines in its good faith
     reasonable judgment (based on the advice of a financial advisor of
     nationally recognized reputation) to be more favorable to DSC's
     shareholders than the terms of the Merger;
 
          (o) change any of DSC's basic policies and practices with respect to
     operations, cash flow planning, marketing, budgeting, profit and tax
     planning, personnel practices or any other material aspect of DSC's
     business or operations, except such changes as may be required by any
     Governmental Entity;
 
          (p) grant any Person a power of attorney or similar authority;
 
          (q) make any investment by purchase of stock or securities (including
     an Investment Security), contributions to capital, property transfers or
     otherwise in any other Person, except for obligations of the United States
     Treasury or an agency of the United States Government the obligations of
     which are entitled to or implied to have the full faith and credit of the
     United States government and which have an original maturity not in excess
     of one year, or investment grade municipal bonds, in any case, in the
     ordinary course of business consistent with past practices and which are
     not designated as trading;
 
          (r) amend or modify any DSC Scheduled Contract or enter into any
     agreement or contract that would be a DSC Scheduled Contract under Section
     4.16, other than (i) amendments or modifications entered into in the
     ordinary course of business and consistent with past practice, (ii) any
     agreement or commitment under any DSC approved planned capital budget
     program, copies of which have been furnished by DSC to CWSG and (iii)
     developer funded projects in accordance with the Commission's Tariff Rule
     15;
 
          (s) sell, transfer, mortgage, encumber, amend indentures to encumber
     or otherwise dispose of any assets of DSC or the DSC Subsidiaries or
     release or waive any claim, except in the ordinary course of business and
     consistent with past practices;
 
          (t) knowingly take any action which would or is reasonably likely to
     (i) adversely affect the ability of CWSG or DSC to obtain any necessary
     approval of any Governmental Entity required for the transactions
     contemplated hereby; (ii) adversely affect DSC's ability to perform its
     covenants and agreements under this Agreement; or (iii) result in any of
     the conditions to the performance of CWSG's or DSC's obligations hereunder,
     as set forth in Articles IX or X herein not being satisfied;
 
          (u) reverse, other than in accordance with generally accepted
     accounting principles (GAAP), any reserves for contingent tax liabilities
     for income tax on services;
 
          (v) [deleted];
 
          (w) sell any security other than in the ordinary course of business,
     or engage in gains trading;
 
          (x) [deleted];
 
          (y) agree or make any commitment to take any actions prohibited by
     this Section 6.1;
 
          (z) knowingly take or cause to be taken an action which would
     disqualify the Merger as a "reorganization" within the meaning of Section
     368 of the Code or prevent CWSG from accounting for the business
     combination to be effected by the Merger as a pooling-of-interests;
 
          (aa) [deleted];
 
          (bb) settle any claim, action or proceeding involving any material
     liability for monetary damages or enter into any settlement agreement
     containing material obligations;
 
          (cc) [deleted];
 
                                      -28-
<PAGE>   125
 
          (dd) incur any indebtedness for borrowed money excluding extensions of
     existing bank lines of credit, or assume, guaranty, endorse or otherwise as
     an accommodation become responsible for the obligations of any other
     person, except for short-term borrowings made at prevailing market rates
     and terms; or
 
          (ee) [deleted].
 
     6.2  Affirmative Conduct of DSC and DSC Subsidiaries Prior to Effective
Time of the Merger. Between the date hereof and the Effective Time of the
Merger, DSC shall, and shall cause the DSC Subsidiaries to:
 
          (a) use commercially reasonable efforts consistent with this Agreement
     to maintain and preserve intact its present business organization and to
     maintain and preserve its relationships and goodwill with customers,
     employees and others having business relationships with DSC or any of the
     DSC Subsidiaries;
 
          (b) use its commercially reasonable efforts to keep in full force and
     effect all of the existing material permits and licenses of DSC and each of
     the DSC Subsidiaries;
 
          (c) use its commercially reasonable efforts to maintain insurance
     coverage at least equal to that now in effect on all properties for which
     it is responsible and on its business operations;
 
          (d) perform its material contractual obligations and not become in
     material default on any such obligations;
 
          (e) duly observe and conform in all material respects to all lawful
     requirements applicable to the business of DSC or any of the DSC
     Subsidiaries;
 
          (f) maintain its assets and properties in good condition and repair,
     normal wear and tear expected;
 
          (g) promptly upon learning of such information, advise CWSG in writing
     of any event or any other transaction within its knowledge whereby any
     Person or Related Group of Persons acquires, directly or indirectly, record
     or beneficial ownership or control (as defined in Rule 13d-3 promulgated by
     the SEC under the Exchange Act) of five percent (5%) or more of the
     outstanding DSC Common Stock prior to the record date fixed for the DSC
     Shareholders' Meeting or any adjourned meeting thereof to approve this
     Agreement and the transactions contemplated herein;
 
          (h) promptly notify CWSG regarding receipt from any tax authority of
     any notification of the commencement of an audit, any request to extend the
     statute of limitations, any statutory notice of deficiency, any revenue
     agent's report, any notice of proposed assessment, or any other similar
     notification of potential adjustments to the tax liabilities of DSC, or any
     actual or threatened collection enforcement activity by any tax authority
     with respect to tax liabilities of DSC;
 
          (i) make available to CWSG SEC filings at the time of filing, press
     releases at the time of release, and monthly unaudited balance sheets and
     income statements of DSC within twenty-five (25) days after the close of
     each calendar month;
 
          (j) not later than the 30th day of each calendar month, amend or
     supplement the DSC Lists prepared and delivered pursuant to Article IV to
     ensure that the information set forth in the DSC Lists accurately reflects
     the then-current status of DSC and the DSC Subsidiaries. DSC shall further
     amend or supplement the DSC Lists as of the Closing Date if necessary to
     reflect any additional information that needs to be included in the DSC
     Lists;
 
          (k) use its commercially reasonable efforts to obtain any third party
     consent with respect to any contract, agreement, lease, license,
     arrangement, permit or release that is material to the business of DSC or
     that is contemplated in this Agreement as required in connection with the
     Merger;
 
          (l) [deleted];
 
          (m) furnish to CWSG, as soon as practicable, and in any event within
     15 days after it is prepared, a copy of any communication submitted to the
     DSC Board of Directors or any committee thereof, provided, however, that
     with the exception of DSC's obligations under Section 6.1(n) of this
     Agreement,
 
                                      -29-
<PAGE>   126
 
     DSC need not furnish to CWSG communications regarding DSC's rights and
     obligations under this Agreement or the transactions contemplated hereby,
     including any Competing Transaction, or books, records and documents
     covered by confidentiality agreements or the attorney-client privilege, or
     which are attorneys' work product;
 
          (n) make available to CWSG all filings with applicable regulators;
 
          (o) as soon as reasonably possible, and prior to the Closing Date,
     obtain and make available to CWSG preliminary title reports for all real
     property owned or leased by DSC; and
 
          (p) as soon as reasonably possible and prior to the Closing Date,
     obtain and make available to CWSG true and correct copies of all leases
     included in the DSC Real Property List, all title insurance policies and
     all documents evidencing recordation of all recordable interests in real
     property included in the DSC Real Property List.
 
     6.3  Access to Information.
 
          (a) Except as otherwise provided in this Article VI, DSC will afford,
     upon reasonable notice, to CWSG and its representatives, counsel,
     accountants, agents and employees reasonable access during normal business
     hours to all of its business, operations, properties, books, files and
     records and will do everything reasonably necessary to enable CWSG and its
     representatives, counsel, accountants, agents and employees to make a
     complete examination of the financial statements, business, assets and
     properties of DSC and the condition thereof and to update such examination
     at such intervals as CWSG shall deem appropriate. Such examination shall be
     conducted in cooperation with the officers of DSC and in such a manner as
     to minimize any disruption of, or interference with, the normal business
     operations of DSC. Upon the request of CWSG, DSC will request Arthur
     Andersen to provide reasonable access to representatives of KPMG Peat
     Marwick working on behalf of CWSG to auditors' work papers with respect to
     the business and properties of DSC, including tax accrual work papers
     prepared for DSC during the preceding sixty (60) months, other than (a)
     books, records and documents covered by the attorney-client privilege, or
     that are attorneys' work product, and (b) books, records and documents that
     DSC is legally obligated to keep confidential. No examination or review
     conducted under this section shall constitute a waiver or relinquishment on
     the part of CWSG of the right to rely upon the representations and
     warranties made by DSC herein; provided, that CWSG shall disclose to DSC
     any fact or circumstance it may discover which CWSG believes renders any
     representation or warranty made by DSC hereunder incorrect in any respect.
     Any examination or review conducted pursuant to this Section 6.3(a) shall
     be at the sole cost and expense of the party conducting or requesting the
     examination or review. CWSG covenants and agrees that it, the CWSG
     Subsidiaries, and their respective representatives, counsel, accountants,
     agents and employees will hold in strict confidence all documents and
     information concerning DSC so obtained from any of them (except to the
     extent that such documents or information are a matter of public record or
     require disclosure in the Proxy Statement and Prospectus or any of the
     public information of any applications required to be filed with any
     Governmental Entity to obtain the approvals and consents required to effect
     the transactions contemplated hereby), and if the transactions contemplated
     herein are not consummated, such confidence shall be maintained and all
     such documents shall be returned to DSC.
 
        (b) [deleted].
 
          (c) With the exception of those portions of minutes relating to
     consideration of this transaction or any Competing Transaction, DSC shall
     provide CWSG with a copy of all minutes of all regular and special Board of
     Directors' and committee meetings of DSC from the date hereof until the
     Effective Date of the Merger. Said copy or copies shall be received by CWSG
     no later that 10 business days following the meeting or meetings to which
     the minutes pertain.
 
     6.4  Review by Accountants. Promptly upon request of CWSG, DSC will request
Arthur Andersen to permit representatives of KPMG Peat Marwick working on behalf
of CWSG to review and examine the work papers of Arthur Andersen relating to DSC
and the Financial Statements of DSC and to review and examine
 
                                      -30-
<PAGE>   127
 
the work papers of Arthur Andersen relating to any future completed audits or
completed reviews of DSC. Any costs incurred in such review and examination will
be paid by CWSG.
 
     6.5  Filings. DSC agrees that through the Effective Time of the Merger,
each of its reports, registrations, statements and other filings required to be
filed with any applicable Governmental Entity will comply in all material
respects with all the applicable statutes, rules and regulations enforced or
promulgated by the Governmental Entity with which it will be filed and none will
contain any untrue statement of material fact or omit to state a material fact
required to be stated therein or necessary to make the statements therein, in
light of the circumstances under which they were made, not misleading. Any
financial statement contained in any such report, registration, statement or
other filing that is intended to present the financial position of the entity to
which it relates will fairly present the financial position of such entity and
will be prepared in accordance with generally accepted accounting principles or
applicable Commission regulations consistently applied during the periods
involved.
 
     6.6  Notices; Reports. Except as provided in Section 6.2(m), DSC will
promptly notify CWSG of any event of which DSC obtains knowledge which has had
or may have a Material Adverse Effect on DSC or in the event that DSC determines
that it is unable to fulfill any of the conditions to the performance of CWSG's
and Water Company's obligations hereunder, as set forth in Articles IX or XI
herein, and DSC will furnish CWSG (i) as soon as available, and in any event
within one (1) Business Day after it is mailed or delivered to the Board of
Directors of DSC or committees thereof, any report by DSC for submission to the
Board of Directors of DSC or committees thereof, (ii) as soon as available, all
proxy statements, information statements, financial statements, reports, letters
and communications sent by DSC to its shareholders or other security holders,
and all reports filed by DSC with the SEC, and (iii) such other existing reports
as CWSG may reasonably request relating to DSC subject to the limitations
contained in Section 6.2(m).
 
     6.7  DSC Shareholders' Meeting. Promptly after the execution of this
Agreement, DSC will take action necessary in accordance with applicable law and
its Articles of Incorporation and Bylaws to convene a meeting of its
shareholders to consider and vote upon this Agreement and the transactions
contemplated hereby so as to permit the consummation of the transactions
contemplated hereby. The Board of Directors of DSC shall, subject to its
fiduciary duties, recommend that its shareholders approve this Agreement and the
transactions contemplated hereby, and the Board of Directors of DSC shall,
subject to its fiduciary duties, use its best efforts to obtain the affirmative
vote of the holders of the largest possible percentage of the outstanding DSC
Stock to approve this Agreement and the transactions contemplated hereby. In
connection with such shareholders meeting, DSC shall prepare a proxy statement
containing the recommendation of the Board of Directors of DSC in favor of this
Agreement and the transactions contemplated hereby; provided, however, that
notwithstanding the foregoing provisions of this sentence, the Board of
Directors of DSC shall be free to take any position and any action which it
determines upon advice of outside counsel to be required to ensure compliance
with the fiduciary obligations of the Board under applicable law.
 
     6.8  [deleted].
 
     6.9  Applications. Subject to Section 7.5, DSC will (i) promptly prepare or
cause to be prepared the portions of the Proxy Statement and Prospectus as it
pertains to DSC and any other applications necessary to consummate the
transactions contemplated hereby; (ii) promptly provide any information
requested by CWSG for the preparation of any applications necessary to
consummate the transactions contemplated hereby; and (iii) promptly prepare and
file, or cause to be prepared and filed, a Hart-Scott-Rodino notification with
the Federal Trade Commission and the United States Department of Justice. DSC
shall afford CWSG a reasonable opportunity to review the portions of the Proxy
Statement and Prospectus pertaining to DSC and all such applications and all
amendments and supplements thereto before the filing thereof. DSC covenants and
agrees that, with respect to the information furnished by DSC or the DSC
Subsidiaries, the Proxy Statement and Prospectus will (i) comply in all material
respects with the provisions of applicable law, and will not contain any untrue
statement of material fact or omit to state any material fact required to be
stated therein or necessary to make the statements contained therein, in light
of the circumstances under which they were made, not misleading, and (ii) comply
in all material respects to the extent relevant with the requirements of all
securities laws and all other applicable rules, regulations and filing
requirements. DSC will
 
                                      -31-
<PAGE>   128
 
use its commercially reasonable efforts to obtain all regulatory approvals or
consents necessary to effect the Merger and the transactions contemplated
herein.
 
     6.10  Affiliates and Five Percent Shareholder Agreements. Concurrently with
the execution of this Agreement, (a) DSC shall deliver to CWSG a letter
identifying all persons who are then "affiliates" of DSC for purposes of Rule
145 under the Securities Act and (b) DSC shall advise the persons identified in
such letter of the resale restrictions imposed by applicable securities laws and
shall obtain, within 30 days of delivery of such letter, from each person
identified in such letter a written agreement substantially in the form attached
hereto as EXHIBIT B. DSC shall use its best efforts to obtain from any person
who becomes an affiliate of DSC after DSC's delivery of the letter referred to
above, and within 30 days of that person becoming an affiliate of DSC or on or
prior to the date of the DSC Shareholders' Meeting to approve this Agreement,
whichever is earliest, a written agreement substantially in the form attached as
EXHIBIT B hereto as soon as practicable after obtaining such status. At least 10
Business Days prior to the issuance of the opinion to be provided for in Section
9.6, DSC shall use its commercially reasonable efforts to cause each person or
group of persons who holds more than five percent (5%) of the DSC Stock
(regardless of whether such person is an "affiliate" under Rule 145) to deliver
to Nossaman, Guthner, Knox & Elliott, LLP, a letter stating that such
shareholder(s) has no present plan or intention to dispose of CWSG Stock that
the shareholder(s) will receive in the Merger, and committing that such
shareholder(s) will not dispose of such CWSG Stock in a manner as to cause a
violation of the "continuity of shareholder interest" requirements of Treasury
Regulation 1.368-1.
 
     6.11  Coordination of Dividends. DSC shall coordinate with CWSG the
declaration of any dividends that may be allowed pursuant to Section 6.1(b)
hereof, and the record date and the payment dates relating thereto, it being the
intention of the parties that holders of DSC Stock shall not receive two
dividends, or fail to receive one dividend, for any applicable dividend period
with respect to their shares of DSC Stock and any shares of CWSG Stock any such
holder will receive in exchange therefor in the Merger.
 
     6.12  D&O Coverage. Prior to the Effective Time of the Merger, DSC shall
obtain a policy of insurance insuring directors and officers of DSC and the DSC
Subsidiaries, and those persons who become directors and officers of DSC or the
DSC Subsidiaries between the date of this Agreement and the Effective Time of
the Merger. This insurance shall be no less protective in terms of policy
limits, coverage or limitations than the insurance for officers and directors
maintained by DSC at the date of this Agreement (the "Current D&O Coverage").
The Current D&O Coverage insures those persons covered by it in an aggregate
amount of $22,000,000, consisting of $3,000,000 of primary coverage and
$19,000,000 of excess (umbrella) coverage. The new D&O insurance to be obtained
by DSC hereunder (the "New Policy") shall provide coverage for a period of up to
48 months following the Effective Time of the Merger and shall cover acts and
omissions occurring prior to the Effective Time of the Merger and acts and
omissions relating to this Agreement and the actions contemplated hereby to the
extent such insurance is commercially available. The above notwithstanding, DSC
shall not obtain or pay for any coverage under the New Policy requiring an
annual premium in excess of 150% of the annual premium that DSC pays for the
Current D&O Coverage, plus any general increases in the cost of D&O insurance
between the date of this Agreement and the periods covered by the New Policy.
 
                                  ARTICLE VII
 
                               COVENANTS OF CWSG
                      PENDING EFFECTIVE TIME OF THE MERGER
 
     CWSG covenants and agrees with DSC as follows:
 
     7.1  Limitation on CWSG's Conduct Prior to Effective Time of the
Merger. Between the date hereof and the Effective Time of the Merger, except as
contemplated by this Agreement and subject to requirements of law and regulation
generally applicable to California corporations, CWSG and the CWSG Subsidiaries
shall not, without prior written consent of DSC (which consent shall not be
unreasonably withheld and which
 
                                      -32-
<PAGE>   129
 
consent shall be deemed granted if within five (5) Business Days of DSC's
receipt of written notice of a request for prior written consent, written notice
of objection is not received by CWSG):
 
          (a) take any action which would or is reasonably likely to (i)
     adversely affect the ability of CWSG or Water Company to obtain any
     necessary approvals of any Governmental Entity required for the
     transactions contemplated hereby; (ii) adversely affect CWSG's or Water
     Company's ability to perform its covenants and agreements under this
     Agreement; or (iii) result in any of the conditions to the performance of
     CWSG's or Water Company's obligations hereunder, as set forth in Articles
     IX or XI herein not being satisfied; or (iv) take any action which would
     prevent listing of the shares to be issued to DSC shareholders from being
     listed;
 
          (b) take or cause to be taken any action which would disqualify the
     Merger as a "reorganization" within the meaning of Section 368 of the Code
     or prevent CWSG from accounting for the business combination to be effected
     by the Merger as a pooling-of-interests;
 
          (c) except as provided in Section 5.1, amend its articles of
     incorporation in any respect which would materially and adversely affect
     the rights and privileges attendant to the CWSG Common Stock; or
 
          (d) agree or make any commitment to take any actions prohibited by
     this Section 7.1.
 
          (e) enter into any transaction or agreement which would result in its
     debt rating being reduced below investment grade;
 
          (f) enter into any other transaction or series of transactions which
     would result in it engaging in operations or lines of business other than
     those currently conducted by CWSG as of the date of this Agreement;
 
          (g) reduce its common stock dividend below its payment level at the
     date of this Agreement; or
 
          (h) enter into any transaction which would result in the acquisition
     in any manner, directly or indirectly, of an equity interest in CWSG
     representing more than 50% of the common stock of CWSG then outstanding, or
     the acquisition of more than 50% of the assets of CWSG, nor shall the board
     of directors of CWSG nor any committee thereof approve or recommend, or
     propose to approve or recommend, any such transaction.
 
     7.2  Affirmative Conduct of CWSG and CWSG Subsidiaries Prior to Effective
Time of the Merger. Between the date hereof and the Effective Time of the
Merger, CWSG shall, and shall cause the CWSG Subsidiaries to:
 
          (a) use commercially reasonable efforts consistent with this Agreement
     to maintain and preserve intact their respective present business
     organizations and to maintain and preserve the relationships and goodwill
     with customers, employees and others having business relationships with
     CWSG or any of the CWSG Subsidiaries;
 
          (b) duly observe and conform in all material respects to all lawful
     requirements applicable to the business of CWSG and each of the CWSG
     Subsidiaries;
 
          (c) make available to DSC SEC filings at the time of filing, press
     releases at the time of release, and monthly unaudited balance sheets and
     income statements of CWSG within twenty-five (25) days after the close of
     each calendar month;
 
          (d) use its commercially reasonable efforts to obtain any third party
     consent with respect to any contract, agreement, lease, license,
     arrangement, permit or release that is material to the business of CWSG on
     a consolidated basis or that is contemplated in this Agreement as required
     in connection with the Merger;
 
          (e) not later than the 30th day of each calendar month, amend or
     supplement the CWSG Lists prepared and delivered pursuant to Article V to
     ensure that the information set forth in the CWSG Lists accurately reflects
     the then-current status of CWSG and the CWSG Subsidiaries. CWSG shall
     further
 
                                      -33-
<PAGE>   130
 
     amend or supplement the CWSG Lists as of the Closing Date if necessary to
     reflect any additional information that needs to be included in the CWSG
     Lists;
 
          (f) [deleted]; and
 
          (g) furnish to DSC, as soon as practicable, and in any event within 15
     days after it is prepared, a copy of any communication submitted to the
     CWSG Board of Directors or any committee thereof, provided, however, that
     CWSG need not furnish to DSC communications regarding CWSG's rights and
     obligations under this Agreement or the transactions contemplated hereby,
     including any Competing Transaction as defined in Section 6.1(n) (assuming
     CWSG rather than DSC to be the target), or books, records and documents
     covered by confidentiality agreements or the attorney-client privilege, or
     which are attorneys' work product.
 
     7.3  Access to Information. Except as otherwise provided in this Article
VII, upon reasonable request by DSC, CWSG shall (i) make its Chief Executive
Officer, Chief Financial Officer and/or Controller available to discuss with DSC
and its representatives CWSG's operations, (ii) shall provide DSC with written
information which is (a) similar to the written information that DSC reviewed in
connection with this Agreement, and (b) related to CWSG's business condition,
operations and prospects; and (iii) make available to DSC the minutes of
meetings of the Board of Directors of CWSG (except to the extent that such
minutes relate to consideration of this transaction or any Competing
Transaction, or contain communications of CWSG's legal counsel regarding CWSG's
rights and obligations under this Agreement or the transactions contemplated
hereby, or contain matters covered by confidentiality agreements or the
attorney-client privilege, or which contain attorney's work product). No
examination or review conducted under this Section shall constitute a waiver or
relinquishment on the part of DSC of the right to rely upon the representations
and warranties made by CWSG herein; provided, that DSC shall disclose to CWSG
any fact or circumstance it may discover which DSC believes renders any
representation or warranty made by CWSG hereunder incorrect in any respect. Any
examination or review conducted pursuant to this Section 7.3 shall be at the
sole cost and expense of the party conducting or requesting the examination or
review. DSC covenants and agrees that it, the DSC Subsidiaries and its
representatives, counsel, accountants, agents and employees will hold in strict
confidence all documents and information concerning CWSG so obtained (except to
the extent that such documents or information are a matter of public record or
require disclosure in the Proxy Statement and Prospectus or any of the public
information of any applications required to be filed with any Governmental
Entity to obtain the approvals and consents required to effect the transactions
contemplated hereby), and if the transactions contemplated herein are not
consummated, such confidence shall be maintained and all such documents shall be
returned to CWSG.
 
     7.4  Filings. CWSG agrees that through the Effective Time of the Merger,
each of its reports, registrations, statements and other filings required to be
filed with any applicable Governmental Entity will comply in all material
respects with all the applicable statutes, rules and regulations enforced or
promulgated by the Governmental Entity with which it will be filed and none will
contain any untrue statement of a material fact or omit to state a material fact
required to be stated therein or necessary to make the statements therein, in
light of the circumstances under which they were made, not misleading. Any
financial statement contained in any such report, registration, statement or
other filing that is intended to present the financial position of the entities
or entity to which it relates will fairly present the financial position of such
entities or entity and will be prepared in accordance with generally accepted
accounting principles or applicable Commission regulations consistently applied
during the periods involved.
 
     7.5  Applications. CWSG will promptly prepare and file or cause to be
prepared and filed (i) an application for approval of the Merger with the
Commission; (ii) in conjunction with DSC, the Registration Statement on Form S-4
regarding securities to be issued to DSC shareholders as a result of the Merger
and the Proxy Statement and Prospectus as it pertains to CWSG for filing with
the SEC; (iii) a Hart-Scott-Rodino notification with the Federal Trade
Commission and the United States Department of Justice; and (iv) any other
applications necessary to consummate the transactions contemplated hereby. CWSG
shall afford DSC a reasonable opportunity to review the Proxy Statement and
Prospectus and all such applications and all amendments and supplements thereto
before the filing thereof. CWSG covenants and agrees that the
 
                                      -34-
<PAGE>   131
 
Registration Statement on Form S-4 and the Proxy Statement and Prospectus and
all applications to the appropriate regulatory agencies for approval or consent
to the Merger, with respect to information furnished by CWSG or the CWSG
Subsidiaries, will (i) comply in all material respects with the provisions of
applicable law, and will not contain any untrue statement of material fact or
omit to state any material fact required to be stated therein or necessary to
make the statements contained therein, in light of the circumstances under which
they were made, not misleading, and (ii) comply in all material respects to the
extent relevant with the requirements of all securities laws and all other
applicable rules, regulations and filing requirements. CWSG will use its
commercially reasonable efforts to obtain all regulatory approvals or consents
necessary to effect the Merger.
 
     7.6  Blue Sky. CWSG agrees to have the shares of CWSG Stock to be issued in
connection with the Merger qualified or registered for offer and sale, to the
extent required, under the securities laws of each jurisdiction in which
shareholders of DSC reside.
 
     7.7  Sales and Net Income Reports. CWSG shall use its reasonable best
efforts to publish as promptly as reasonably practical, but in no event later
than 45 days after the end of the first month after the Effective Time in which
there are at least 30 days of post-Merger combined operations (which month may
be the month in which the Effective Time occurs), combined sales and net income
figures as contemplated by and in accordance with the terms of SEC Accounting
Series Release No. 135.
 
     7.8  Securities Act and Exchange Act Filings. (a) CWSG shall make all
filings with the SEC that are described in Section (c) of Rule 144 under the
Securities Act for a period of two years following the Effective Time.
 
     7.9  Notices; Reports. Except as provided in Section 7.2(g), CWSG will
promptly notify DSC of any event of which CWSG obtains knowledge which has had
or may have a Material Adverse Effect on CWSG on a consolidated basis or in the
event that CWSG determines that it is unable to fulfill any of the conditions to
the performance of DSC's obligations hereunder, as set forth in Articles IX or X
herein, and CWSG will furnish DSC (i) as soon as available, and in any event
within ten (10) days after it is prepared, any report by CWSG for submission to
the Board of Directors of CWSG or committees thereof, (ii) as soon as available,
all proxy statements, information statements, financial statements, reports,
letters and communications sent by CWSG to its shareholders or other security
holders, and all reports filed by CWSG with the SEC and the Commission and (iii)
such other existing reports as DSC may reasonably request relating to CWSG
subject to the limitations contained in Section 7.2(g).
 
     7.10  Removal of Conditions. In the event of the imposition of a condition
to any regulatory approvals which CWSG deems to materially adversely affect it
or to be materially burdensome as provided in Section 9.3 hereof, CWSG shall use
its commercially reasonable efforts for purposes of obtaining the removal of
such condition.
 
                                  ARTICLE VIII
 
                              ADDITIONAL COVENANTS
 
     The parties hereto hereby mutually covenant and agree with each other as
follows:
 
     8.1  Best Efforts. Subject to the terms and conditions of this Agreement,
each party will use its best efforts to take, or cause to be taken, all actions
and to do, or cause to be done, all things necessary, proper or advisable under
applicable laws and regulations to consummate the transactions contemplated by
this Agreement as promptly as practical.
 
     8.2  Public Announcements. No press release or other public disclosure of
matters related to this Agreement or any of the transactions contemplated hereby
shall be made by CWSG or DSC unless the other party shall have provided its
prior consent to the form and substance thereof; provided, however, that nothing
herein shall be deemed to prohibit any party hereto from making any disclosure
which its counsel deems necessary or advisable in order to fulfill such party's
disclosure obligations imposed by law. If and where feasible, CWSG and DSC shall
use their best efforts and shall cooperate with each other to issue joint press
 
                                      -35-
<PAGE>   132
 
releases or other public disclosure of matters related to this Agreement or any
of the transactions contemplated hereby.
 
     8.3  [deleted].
 
     8.4  [deleted].
 
     8.5  Confidentiality and Non-Disclosure.
 
     (a) Each party has furnished and will furnish information concerning its
business (herein collectively referred to as the "Evaluation Material") to the
other party. Each party agrees to use the Evaluation Material received from the
other only in accordance with the provisions of this Agreement and to take or
refrain from taking certain other actions set forth herein. The term "Evaluation
Material" shall include any and all information, oral or written, concerning the
Merger or any other actual or potential transaction between the parties or
concerning the parties' respective businesses, which heretofore has been or
hereafter is disclosed by CWSG or DSC, or any of their respective partners,
directors, officers, shareholders, employees, agents or advisors (for the
purposes of this Section 8.5 and Section 8.6, collectively called
"representatives"), either directly or indirectly, in writing, orally or by
physical inspection, and whether disclosed prior to or after the date of this
Agreement, together with all analyses, compilations, studies or other data,
documents or records prepared by either party or any of its representatives
which contain or otherwise reflect or are generated from any such information or
documents. Evaluation Material does not include information that is (i) publicly
known (other than as a result of a breach of this Agreement), (ii) approved for
release by written authorization of the party that provided such information, or
(iii) lawfully obtained from third parties who are not bound by a
confidentiality agreement with the party that provided such information.
 
     (b) CWSG and DSC each agrees that the Evaluation Material will be used
solely for purposes of this Agreement and the transactions contemplated hereby,
and not in connection with the consideration of any other transaction,
including, without limitation, any other transaction or investment directly or
indirectly involving the other party, and that all information contained therein
will be kept confidential by such party. CWSG and DSC may disclose such
Evaluation Material to their representatives who need to have access to such
Evaluation Material in connection with the Merger; provided, that each party
shall advise all of its representatives to whom the Evaluation Material is
disclosed of its obligations under this Agreement and shall take all reasonable
steps to insure that such persons or entities to whom disclosure is made shall
have been advised of the confidentiality thereof and shall have agreed, for the
benefit of the other party, to be bound by confidentiality provisions similar to
those set forth in this Agreement. CWSG and DSC each agrees that it shall
protect the confidentiality of and avoid disclosure or use of the Evaluation
Material, except (i) as permitted in writing by an authorized representative of
the other party and (ii) for disclosure to such party's representatives who need
to know such information for purposes of evaluating the possible Merger between
CWSG and DSC. In complying with its obligations herein, each party shall
exercise at least the same degree of care to safeguard the Evaluation Material
received from the other party as it would use if the confidential information
contained therein were its own confidential information.
 
     (c) In the event that either party or its representatives is required in
any proceeding to disclose any Evaluation Material, such party (for the purposes
of this Section 8.5 (c), the "Compelled Party") will give the other party prompt
notice so that the other party may seek an appropriate protective order. If, in
the absence of a protective order, the Compelled Party or its representatives is
compelled to disclose such Evaluation Material, the Compelled Party or its
representatives as the case may be, may disclose such information to the extent
compelled to do so in such proceeding without liability hereunder; provided,
however, that the Compelled Party shall give the other party written notice of
the information to be disclosed as far in advance of the disclosure as is
practicable and shall use its best efforts to obtain assurances that
confidential treatment will be accorded to such information.
 
     8.6  Return of Materials. If this Agreement is terminated or the Merger is
otherwise not consummated, each party shall promptly redeliver all written
Evaluation Material received from the other party, and all documents, memoranda,
notes and other writings whatsoever prepared by such party or any of its
representatives based on the information in any of the Evaluation Material
received from the other party shall be
 
                                      -36-
<PAGE>   133
 
destroyed. It is expressly understood and agreed by the parties hereto that
their respective obligations hereunder shall survive the return of materials as
set forth above and the termination, expiration or rescission of this Agreement.
 
                                   ARTICLE IX
 
                       CONDITIONS PRECEDENT TO THE MERGER
 
     The obligations of each of the parties hereto to consummate the
transactions contemplated herein are subject to the satisfaction, on or before
the Closing Date, of the following conditions:
 
     9.1  Shareholder Approval. The Agreement and the transactions contemplated
hereby shall have received all requisite approvals of the shareholders of DSC no
later than April 1, 1999.
 
     9.2  No Judgments or Orders. No judgment, decree, injunction, order or
proceeding shall be outstanding or threatened by any Governmental Entity which
prohibits or restricts the effectuation of, or threatens to invalidate or set
aside, the Merger substantially in the form contemplated by this Agreement,
unless counsel to the party against whom such action or proceeding was
instituted or threatened renders to the other parties hereto a favorable opinion
that such judgment, decree, injunction, order or proceeding is without merit.
 
     9.3  Regulatory Approvals. To the extent required by applicable law or
regulation, all approvals or consents of any Governmental Entity, including,
without limitation those of the Commission, the Federal Trade Commission and the
United States Department of Justice shall have been obtained or granted for the
Merger and the transactions contemplated hereby, and all applicable waiting
periods under all laws shall have expired. All other statutory or regulatory
requirements for the valid completion of the transactions contemplated hereby
shall have been satisfied.
 
     9.4  Securities Laws. The Registration Statement on Form S-4 shall have
been declared effective by the SEC and shall not be the subject of any stop
order or proceedings seeking or threatening a stop order. CWSG shall have
received all state securities or "Blue Sky" permits and other authorizations
necessary to issue the CWSG Stock to consummate the Merger.
 
     9.5  Listing. The CWSG Stock issuable in the Merger shall have been
included for listing on the New York Stock Exchange.
 
     9.6  Tax Opinions. CWSG and DSC shall have received from KPMG Peat Marwick
an opinion reasonably satisfactory to CWSG and DSC, respectively, to the effect
that the Merger shall not result in the recognition of gain or loss for federal
income tax purposes to CWSG or DSC, nor shall the issuance of the CWSG Stock
result in the recognition of gain or loss by the holders of DSC Stock who
receive such stock in connection with the Merger, dated prior to the date the
Proxy Statement and Prospectus is first mailed to the shareholders of DSC and
CWSG and such opinions shall not have been withdrawn or modified in any material
respect.
 
     9.7  Pooling of Interests. Prior to the Effective Time of the Merger, KPMG
Peat Marwick shall have delivered a written opinion to CWSG that, to the best
knowledge of KPMG Peat Marwick, the Merger will qualify for pooling-of-interests
accounting treatment. In making its determination that the Merger will qualify
for such treatment, KPMG Peat Marwick shall be entitled to assume that cash will
be paid with respect to all shares held of record by any holder of Dissenting
Shares. Arthur Andersen will provide DSC, with a copy to KPMG Peat Marwick, a
"poolability" letter addressed to DSC regarding DSC's ability to comply with
pooling of interests accounting.
 
                                      -37-
<PAGE>   134
 
                                   ARTICLE X
 
                 CONDITIONS PRECEDENT TO THE OBLIGATIONS OF DSC
 
     All of the obligations of DSC to effect the transactions contemplated
hereby shall be subject to the satisfaction, on or before the Closing Date, of
the following conditions, any of which may be waived in writing by DSC:
 
     10.1  Legal Opinion. DSC shall have received the opinion of Nossaman,
Guthner, Knox & Elliott, LLP, attorneys for CWSG and Water Company, dated as of
the Closing Date, and in form and substance satisfactory to the counsel of DSC,
to the effect that (i) each of CWSG and Water Company is a corporation validly
existing under the laws of its jurisdiction of incorporation with full corporate
power and authority to enter into this Agreement and to consummate the
transactions contemplated hereby; (ii) all corporate proceedings on the part of
CWSG and Water Company necessary to be taken in connection with the Merger in
order to make the same effective have been duly and validly taken; (iii) this
Agreement has been duly and validly authorized, executed and delivered on behalf
of CWSG and Water Company and constitutes (subject to standard exceptions of
enforceability arising from the bankruptcy laws and rules of equity) a valid and
binding agreement of each of CWSG and Water Company; (iv) the execution of the
Agreement of Merger by Water Company and CWSG has been duly and validly
authorized and (v) the shares of CWSG Stock to be issued in the Merger will,
when issued, be duly authorized, validly issued, fully paid and nonassessable.
 
     10.2  Representations and Warranties; Performance of Covenants. All the
covenants, terms and conditions of this Agreement to be complied with and
performed by CWSG and Water Company on or before the Closing Date shall have
been complied with and performed in all material respects. Each of the
representations and warranties of CWSG contained in Article V hereof shall have
been true and correct in all material respects (except that where any statement
in a representation or warranty expressly includes a standard of materiality,
such statement shall be true and correct in all respects) on and as of the date
of this Agreement and (except to the extent such representations and warranties
speak as of an earlier date or for changes expressly contemplated by this
Agreement) on and as of the Closing Date, with the same effect as though such
representations and warranties had been made on and as of the Closing Date. It
is understood and acknowledged that the representations being made on and as of
the Closing Date shall be made without giving effect to any update with respect
to the CWSG Lists in accordance with Section 7.2(e).
 
     10.3  Authorization of Merger. All actions necessary to authorize the
execution, delivery and performance of this Agreement and the Agreement of
Merger by CWSG and Water Company and the consummation of the transactions
contemplated hereby and thereby shall have been duly and validly taken by the
respective Boards of Directors and Water Company shall have full power and right
to merge pursuant to the Agreement of Merger.
 
     10.4  Absence of Certain Changes. Between the date of this Agreement and
the Effective Time of the Merger, there shall not have occurred any event that
has had or could reasonably be expected to have a Material Adverse Effect on
CWSG on a consolidated basis, whether or not such event, change or effect is
reflected in the CWSG Lists as amended or supplemented after the date of this
Agreement.
 
     10.5  Officers' Certificate. There shall have been delivered to DSC on the
Closing Date a certificate executed by the Chief Executive Officer and the Chief
Financial Officer of CWSG certifying, to the best of their knowledge, compliance
with all of the provisions of Sections 10.2, 10.3 and 10.4.
 
     10.6  Fairness Opinion. DSC shall have received a letter from PaineWebber
dated as of a date within five (5) Business Days of the mailing of the Proxy
Statement and Prospectus to the shareholders of DSC, to the effect that the
transactions contemplated by this Agreement are fair from a financial point of
view to the shareholders of DSC.
 
     10.7  [deleted].
 
                                      -38-
<PAGE>   135
 
                                   ARTICLE XI
 
                            CONDITIONS PRECEDENT TO
                     OBLIGATIONS OF CWSG AND WATER COMPANY
 
     All of the obligations of CWSG and Water Company to effect the transactions
contemplated hereby shall be subject to the satisfaction, on or before the
Closing Date, of the following conditions, any of which may be waived in writing
by CWSG:
 
     11.1  Legal Opinion. CWSG shall have received the opinion of Fulbright &
Jaworski, LLP, attorneys for DSC, and in form and substance satisfactory to the
counsel of CWSG, to the effect that: (i) DSC is a corporation validly existing
under the laws of its jurisdiction of incorporation with full corporate power
and authority to enter into this Agreement and the Agreement of Merger and to
consummate the transactions contemplated hereby and thereby; (ii) all corporate
proceedings on the part of DSC necessary to be taken in connection with the
Merger in order to make the same effective have been duly and validly taken;
(iii) this Agreement has been duly and validly authorized, executed and
delivered on behalf of DSC and constitutes (subject to standard exceptions of
enforceability arising from the bankruptcy laws and rules of equity) a valid and
binding agreement of DSC; and (iv) the execution of the Agreement of Merger by
DSC has been duly and validly authorized.
 
     11.2  Representations and Warranties; Performance of Covenants. All the
covenants, terms and conditions of this Agreement to be complied with and
performed by DSC at or before the Closing Date shall have been complied with and
performed in all material respects. Each of the representations and warranties
of DSC contained in Article IV hereof shall have been true and correct in all
material respects (except that where any statement in a representation or
warranty expressly includes a standard of materiality, such statement shall be
true and correct in all respects) on and as of the date of this Agreement and
(except to the extent such representations and warranties speak as of an earlier
date or for changes expressly contemplated by this Agreement) on and as of the
Closing Date, with the same effect as though such representations and warranties
had been made on and as of the Closing Date. It is understood and acknowledged
that the representations being made on and as of the Closing Date shall be made
without giving effect to any update with respect to the DSC Lists in accordance
with Section 6.2(j).
 
     11.3  Authorization of Merger. All actions necessary to authorize the
execution, delivery and performance of this Agreement and the Agreement of
Merger by DSC and the consummation of the transactions contemplated hereby and
thereby shall have been duly and validly taken by the Board of Directors and
shareholders of DSC, and DSC shall have full power and right to merge pursuant
to the Agreement of Merger.
 
     11.4  Third Party Consents. DSC shall have obtained all consents of other
parties to its respective material mortgages, notes, leases, franchises,
agreements, licenses and permits as may be necessary to permit the Merger and
the transactions contemplated herein to be consummated except where the failure
to obtain any such consent would not result in a Material Adverse Effect on DSC
or the Surviving Corporation.
 
     11.5  Absence of Certain Changes. Between the date of this Agreement and
the Effective Time of the Merger, there shall not have occurred any event that
has had or could reasonably be expected to have a Material Adverse Effect on
DSC, whether or not such event, change or effect is reflected in the DSC Lists
as amended or supplemented after the date of this Agreement.
 
     11.6  Officers' Certificate. There shall have been delivered to CWSG on the
Closing Date a certificate executed by the Chief Executive Officer and the Chief
Financial Officer of DSC certifying, to the best of their knowledge, compliance
with all of the provisions of Sections 11.2, 11.3, 11.4, 11.5 and 11.16.
 
     11.7  [deleted].
 
     11.8  [deleted].
 
     11.9  [deleted].
 
                                      -39-
<PAGE>   136
 
     11.10  Affiliates Agreements. Within 30 days of the execution of this
Agreement, CWSG shall have received from each person named in the letter or
otherwise referred to in Section 6.10 an executed copy of an agreement
substantially in the form of EXHIBIT B hereto.
 
     11.11  Employee Benefit Plans. CWSG shall have received satisfactory
evidence that all of DSC's employee benefit plans, programs and arrangements,
including, without limitation, the DSC 401(k) Plan, have been treated as
provided in Article XII of this Agreement except where the failure to do so
would not have a Material Adverse Effect on DSC.
 
     11.12  Dissenting Shares. Holders of five percent (5%) or more of the
outstanding shares of DSC Stock shall not be DSC Perfected Dissenting Shares who
have made demand for payment of the fair market value thereof in accordance with
Section 1301 of the CGCL in connection with the Merger.
 
     11.13  [deleted].
 
     11.14  [deleted].
 
     11.15  [deleted].
 
     11.16  Termination of DSC Stock Option Plans. CWSG shall have received
satisfactory evidence that the DSC Stock Option Plans have been terminated prior
to the Effective Time of the Merger.
 
                                  ARTICLE XII
 
                               EMPLOYEE BENEFITS
 
     12.1  Employee Benefits. CWSG intends to merge the DSC 401(k) Plan with and
into the CWSG 401(k) Plan as soon as administratively feasible after the
Effective Time of the Merger. In no event shall the DSC 401(k) Plan be merged
with and into the CWSG 401(k) Plan, however, unless CWSG determines, in its sole
discretion, that: (i) the DSC 401(k) Plan is a qualified plan under Section
401(a) of the Code, both as to the form of the DSC 401(k) Plan and as to its
operation; and (ii) there are no facts in existence that would be reasonably
likely to adversely affect the qualified status of the DSC 401(k) Plan. This
analysis shall be made prior to the Effective Time of the Merger and, if the
above determinations are made, the DSC 401(k) Plan shall be merged with and into
the CWSG 401(k) Plan as soon as administratively feasible after the Effective
Time of the Merger. If it is determined that the DSC 401(k) Plan is not a
qualified plan as described above, DSC agrees to use its best efforts to have
the DSC 401(k) Plan qualified prior to the Effective Time of the Merger.
 
     As soon as practicable after the Effective Time of the Merger, all other
DSC employee benefit plans will be discontinued or merged into CWSG plans, in
the discretion of CWSG, and employees of DSC shall become eligible for the
employee benefit plans of CWSG on the same terms as such plans and benefits are
generally offered from time to time to employees of CWSG and the CWSG
Subsidiaries in comparable positions with CWSG or the CWSG Subsidiaries. For
purposes of determining such employment eligibility and vesting under the
employee benefit plans of CWSG, CWSG shall recognize such employees years of
service with DSC beginning on the date such employees commenced employment with
DSC through the Effective Time of the Merger.
 
                                  ARTICLE XIII
 
                                  TERMINATION
 
     13.1  Termination. This Agreement may be terminated at any time prior to
the Effective Time of the Merger upon the occurrence of any of the following:
 
          (a) By mutual agreement of the parties, in writing;
 
          (b) By DSC or CWSG immediately upon the failure of the shareholders of
     DSC to give any required approval of this Agreement;
 
                                      -40-
<PAGE>   137
 
          (c) By DSC if CWSG breaches or fails to satisfy any covenant or
     agreement contained herein which results in a Material Adverse Effect on
     DSC and CWSG had not cured such breach within ninety (90) days after DSC
     has delivered written notice of such breach to CWSG or if such cure has not
     occurred by the Drop Dead Date if such date occurs prior to the expiration
     of such ninety (90) day period;
 
          (d) By CWSG if DSC breaches or fails to satisfy any covenant or
     agreement contained herein which results in a Material Adverse Effect on
     CWSG and DSC had not cured such breach within ninety (90) days after CWSG
     has delivered written notice of such breach to DSC or if such cure has not
     occurred by the Drop Dead Date if such date occurs prior to the expiration
     of such ninety (90) day period;
 
          (e) By DSC or CWSG upon the expiration of thirty (30) days after any
     Governmental Entity denies or refuses to grant any approval, consent or
     authorization required to be obtained in order to consummate the
     transactions contemplated by this Agreement unless, within said thirty (30)
     day period after such denial or refusal, all parties hereto agree to
     re-submit the application to the regulatory authority that has denied, or
     refused to grant the approval, consent or qualification requested;
 
          (f) By DSC or CWSG if any conditions set forth in Article IX shall not
     have been met by the Drop Dead Date;
 
          (g) By DSC if any of the conditions set forth in Article X shall not
     have been met, or by CWSG if any of the conditions set forth in Article XI
     shall not have been met, by the Drop Dead Date, or such earlier time as it
     becomes apparent that such condition shall not be met;
 
          (h) By CWSG if DSC shall have failed to act or refrain from doing any
     act pursuant to Section 6.1(n); or
 
          (i) [deleted].
 
     13.2  Termination Date. This Agreement shall terminate if the Closing Date
shall not have occurred by the Drop Dead Date unless extended in writing by the
parties. CWSG and DSC each will cooperate with one another and use their best
efforts to prepare all necessary documentation, to effect all necessary filings
and to obtain all necessary permits, consents, approvals and authorizations of
all third parties and governmental bodies necessary to consummate the
transactions contemplated by this Agreement. CWSG and DSC each shall have the
right to review and approve in advance all characterizations of the information
relating to CWSG and DSC, as the case may be, and any of the characterizations
of information relating to the CWSG Subsidiaries and the DSC Subsidiaries, which
appear in any filing made in connection with the transactions contemplated by
this Agreement with any governmental body. In exercising the foregoing right,
CWSG and DSC each shall act as promptly as practicable, recognizing that time is
of the essence to the transactions contemplated by this Agreement.
 
     13.3  Effect of Termination. In the event of termination of this Agreement
by either DSC or CWSG as provided in Section 13.1 or pursuant to Section 13.2,
neither DSC, CWSG nor Water Company shall have any further obligation or
liability to the other party except (a) with respect to the last sentences of
each of Section 6.3(a) and Section 7.3, (b) with respect to Sections 8.5, 14.1,
14.2 and 14.16 and (c) to the extent such termination results from a party's
willful and material breach of the warranties and representations made by it, or
willful and material failure in performance of any of its covenants, agreements
or obligations hereunder.
 
     13.4  Force Majeure. DSC, CWSG and Water Company agree that,
notwithstanding anything to the contrary in this Agreement, in the event this
Agreement is terminated as a result of a failure of a condition, which failure
is due to a natural disaster or other act of God, or an act of war, and provided
neither party has materially failed to observe the obligations of such party
under this Agreement, neither party shall be obligated to pay to the other party
to this Agreement any expenses or otherwise be liable hereunder.
 
                                      -41-
<PAGE>   138
 
                                  ARTICLE XIV
 
                                 MISCELLANEOUS
 
     14.1  Expenses.
 
          (a) CWSG hereby agrees that if this Agreement is terminated by DSC
     pursuant to Section 13.1(c) or by DSC or CWSG pursuant to Section 13.1(e),
     and DSC has not failed in any material respect to perform it obligations
     under this Agreement, CWSG shall promptly, and in any event within 10 days
     after such termination, pay DSC all actual Expenses (as defined in Section
     14.1(c) below) of DSC but not to exceed $1,500,000.
 
          (b) DSC hereby agrees that if the Agreement is terminated by CWSG
     pursuant to Section 13.1(b) with respect to the failure of DSC shareholders
     to approve the Agreement and the transactions contemplated hereby, or
     pursuant to Section 13.1(d) or Section 13.1(h), and CWSG has not failed in
     any material respect to perform its obligations under this Agreement, DSC
     shall promptly and in any event within 10 days after such termination pay
     CWSG all actual Expenses of CWSG, but not to exceed $1,500,000.
 
          (c) Except as otherwise provided herein, all Expenses incurred by CWSG
     or DSC shall be borne solely and entirely by the party which has incurred
     the same. "Expenses" as used in this Agreement shall include all out of
     pocket expenses incurred by a party, or on its behalf, in connection with
     or related to the authorization, preparation and execution of this
     Agreement, the solicitation of shareholder approvals and all other matters
     related to the closing of the transactions contemplated hereby, including,
     without limitation of the generality of the foregoing, all fees and
     expenses of agents, representatives, counsel and accountants employed by
     either such party or its affiliates.
 
          (d) [deleted].
 
     14.2  Liquidated Damages; Bust-up Fees.
 
          (a) [deleted].
 
          (b) If the Merger is not consummated by reason of one of the following
     events and CWSG has not failed to any material extent to perform its
     obligations under this Agreement, DSC shall pay to CWSG, as liquidated
     damages, the sum of $1,500,000: (i) the Board of Directors of DSC or any
     committee thereof shall have withdrawn or modified in a manner adverse to
     CWSG its approval or recommendation of the Merger or this Agreement or
     shall have recommended a Superior Proposal; (ii) DSC shall have entered
     into any agreement (other than a confidentiality agreement) with respect to
     a Superior Proposal; (iii) the Board of Directors of DSC shall have
     resolved to do any of the foregoing set forth in (i) or (ii) above; or (iv)
     those four members of the Board of Directors of DSC who are affiliates,
     directors, shareholders or officers of the two largest shareholders of DSC
     as of the date of this Agreement all shall have withdrawn or modified in a
     manner adverse to CWSG their approval or recommendation of the Merger or
     this Agreement or all shall have recommended a Superior Proposal.
 
          (c) If the Merger is not consummated and, within 24 months after the
     effective date of the termination of this Agreement, DSC shall have
     consummated a Superior Proposal with the person whose Superior Proposal was
     recommended by the Board of Directors of DSC and CWSG has not failed to any
     material extent to perform its obligations under this Agreement, DSC shall
     pay to CWSG, as liquidated damages, the sum of $1,200,000 which amount is
     in addition to amounts payable to CWSG pursuant to Section 14.2(b).
 
          (d) The party owing liquidated damages ("Paying Party") shall make
     such payment to that party which is owed liquidated damages ("Receiving
     Party") in immediately available funds within 30 days following the day on
     which the Receiving Party properly notifies the Paying party in writing
     that one of the events described in Section 14.2, subdivisions (b) and (c)
     hereof has occurred. The Paying Party shall make such payment as
     compensation and liquidated damages for the loss suffered by Receiving
 
                                      -42-
<PAGE>   139
 
     Party as a result of the failure of the Merger to be consummated and to
     avoid the difficulty of determining damages in that circumstance.
 
          (e) The payment of liquidated damages to CWSG, pursuant to subdivision
     (b) or (c) of this Section 14.2, shall be a one time payment regardless of
     the number of times an event occurs or the number of events which occur
     that would trigger payments.
 
          (f) Any liquidated damages paid in accordance with this Section 14.2
     which sum represents (i) the Receiving Party's direct costs and expenses
     (including, but not limited to, fees and expenses of financial or other
     consultants, printing costs, accountants, and counsel) incurred in
     negotiating and undertaking to carry out the transactions contemplated by
     this Agreement, including the Receiving Party's management time devoted to
     negotiation and preparation for the transactions contemplated by this
     Agreement; (ii) the Receiving Party's indirect costs and expenses incurred
     in connection with the transactions contemplated by this Agreement; and
     (iii) the Receiving Party's loss as a result of the transactions
     contemplated by this Agreement not being consummated. Any payment
     previously made by the Paying Party pursuant to Section 14.1(a) or 14.1(b)
     hereof shall be credited against any amount due under this Section.
 
     14.3  Notices. Any notice, request, instruction or other document to be
given hereunder by any party hereto to another shall be in writing and delivered
personally or by confirmed facsimile transmission or sent by registered or
certified mail, postage prepaid, with return receipt requested, addressed as
follows:
 
<TABLE>
        <S>               <C>
        To CWSG:          California Water Service Group
        or Water Company  1720 North First Street
                          San Jose, CA 95112-4598
                          Attention: Peter C. Nelson
                          President & CEO
                          Facsimile Number: (408) 367-8430
 
        With a copy to:   Nossaman, Guthner, Knox & Elliott, LLP
                          50 California Street, 34th Floor
                          San Francisco, CA 94111
                          Attention: Stanley S. Taylor, Esq.
                          Facsimile Number: (415) 398-2438
 
        To DSC:           Dominguez Services Corporation
                          21718 South Alameda Street
                          Long Beach, CA 90810-0351
                          Attention: Brian Brady
                          President & CEO
                          Facsimile Number: (310) 830-2881
 
        With a copy to:   Fulbright & Jaworski, LLP
                          865 South Figueroa Street, 29th Floor
                          Los Angeles, CA 90017
                          Attention: David Ebershoff, Esq.
                          Facsimile Number: (213) 680-4518
</TABLE>
 
     Any such notice, request, instruction or other document shall be deemed
received on the date delivered personally or delivered by confirmed facsimile
transmission, or on the third business day after it was sent by registered or
certified mail, postage prepaid. Any of the persons shown above may change its
address for purposes of this Section by giving notice in accordance herewith.
 
     14.4  Successors and Assigns. All terms and conditions of this Agreement
shall be binding upon and shall inure to the benefit of the parties hereto and
their respective transferees, successors and assigns; provided, however, that
this Agreement and all rights, privileges, duties and obligations of the parties
hereto may not be assigned or delegated by any party hereto and any such
attempted assignment or delegation shall be null and void.
 
                                      -43-
<PAGE>   140
 
     14.5  Counterparts. This Agreement and any exhibit hereto may be executed
in one or more counterparts, all of which, taken together, shall constitute one
original document and shall become effective when one or more counterparts have
been signed by the appropriate parties and delivered to each party hereto.
 
     14.6  Effect of Representations and Warranties. The representations and
warranties contained in this Agreement or in any List shall terminate
immediately after the Effective Time of the Merger.
 
     14.7  Third Parties. Each party hereto intends that this Agreement shall
not benefit or create any right or cause of action to any person other than
parties hereto. As used in this Agreement the term "parties" shall refer only to
CWSG, Water Company or DSC as the context may require.
 
     14.8  Lists, Exhibits; Integration. Each List, exhibit and letter or other
documents delivered pursuant to this Agreement or referred to in Section 2.8
shall be in writing and shall constitute a part of the Agreement, although Lists
and letters or other documents need not be attached to each copy of this
Agreement. Any information unintentionally omitted in any list furnished by one
party to the other, but included in a separate list furnished by the same party
to the other, shall be deemed included in the list from which the information
was unintentionally omitted. This Agreement, together with such Lists, exhibits
and letters or other documents, constitutes the entire agreement between the
parties pertaining to the subject matter hereof and supersedes all prior
agreements and understandings of the parties in connection therewith.
 
     14.9  Knowledge. Whenever any statement herein or in any List, certificate
or other document delivered to any party pursuant to this Agreement is made "to
the knowledge" or "to the best knowledge" of any party or another Person, such
party or other Person shall make such statement only after conducting such
investigation as may be reasonable under the circumstances of the subject matter
thereof, and each such statement shall constitute a representation that such
investigation, if any, has been conducted.
 
     14.10  Governing Law. This Agreement is made and entered into in the State
of California, except to the extent that the provisions of federal law are
mandatorily applicable, and the laws of the State of California shall govern the
validity and interpretation hereof and the performance of the parties hereto of
their respective duties and obligations hereunder.
 
     14.11  Captions. The captions contained in this Agreement are for
convenience of reference only and do not form a part of this Agreement and shall
not affect the interpretation hereof.
 
     14.12  Severability. If any portion of this Agreement shall be deemed by a
court of competent jurisdiction to be unenforceable, the remaining portions
shall be valid and enforceable only if, after excluding the portion deemed to be
unenforceable, the remaining terms hereof shall provide for the consummation of
the transactions contemplated herein in substantially the same manner as
originally set forth at the date this Agreement was executed.
 
     14.13  Waiver and Modification; Amendment. No waiver of any term, provision
or condition of this Agreement, whether by conduct or otherwise, in any one or
more instances, shall be deemed to be or construed as a further or continuing
waiver of any such term, provision or condition of this Agreement. Except as
otherwise required by law, this Agreement and the Agreement of Merger, when
executed and delivered, may be modified or amended by action of the Boards of
Directors of CWSG, Water Company or DSC without action by their respective
shareholders. This Agreement may be modified or amended only by an instrument of
equal formality signed by the parties or their duly authorized agents.
 
     14.14  Attorneys' Fees. If any legal action or any arbitration upon mutual
agreement is brought for the enforcement of this Agreement or because of an
alleged dispute, controversy, breach, or default in connection with this
Agreement, the prevailing party shall be entitled to recover reasonable
attorneys' fees and other costs and expenses incurred in that action or
proceeding, in addition to any other relief to which it may be entitled.
 
     14.15  Arbitration. Any controversy arising out of, or relating to, this
Agreement or the other transactions contemplated by this Agreement, or any
modification or extension thereof, including any claim for damages, shall be
settled by arbitration in San Francisco, California. Such arbitration shall be
conducted in accordance with the commercial rules then obtaining of the American
Arbitration Association, except as otherwise specified herein. The arbitration
shall be conducted by a panel of three arbitrators. Each party shall
 
                                      -44-
<PAGE>   141
 
select one arbitrator, and the two arbitrators so chosen shall select the third
arbitrator. In the event that the two arbitrators chosen by the parties can not
agree on the third arbitrator, the commercial rules then obtaining of the
American Arbitration Association shall apply to determine who the third
arbitrator shall be. The arbitration panel shall be selected within sixty (60)
days after the date arbitration is first sought, and the arbitration panel shall
render a decision on the matter within one hundred twenty (120) days after
submission of the dispute to the arbitration panel, unless the parties agree in
writing to a longer period of time. The decision of a majority of the
arbitrators shall be binding upon both parties, and the parties hereby consent
to the jurisdiction of any competent court for the purpose of the entry of a
judgment upon any award rendered by the arbitration panel.
 
     14.16  Other Rights and Remedies. Notwithstanding any other provision of
this Agreement, including, without limitation, Sections 14.1 and 14.2, as an
inducement for DSC to enter into this Agreement, if this Agreement is terminated
by DSC because of a failure by CWSG to comply with its obligations under Section
7.1(a) because CWSG entered into an agreement to acquire, merge or consolidate
with another entity, which by its terms requires that the transactions
contemplated by this Agreement shall not be completed by the Drop Dead Date or
which transaction any Governmental Entity advised CWSG in writing would result
in the disapproval of the transactions contemplated in this Agreement, if such
transaction is consummated prior to termination of this Agreement or during the
twelve-month period following termination of this Agreement, then, in addition
to the Expenses provided for in Section 14.1 (but not limited to $1,500,000),
DSC shall be entitled to all other rights and remedies available to it at law or
in equity, which rights and remedies shall not be subject to the limitations
contained in Section 14.1 and 14.2.
 
                            [SIGNATURE PAGE FOLLOWS]
 
                                      -45-
<PAGE>   142
 
     IN WITNESS WHEREOF, the parties to this Agreement have duly executed this
Agreement as of the day and year first above written.
 
                                          California Water Service Group,
                                          a California corporation
 
                                          By: /s/ ROBERT W. FOY
                                            ------------------------------------
                                            Robert W. Foy
                                            Chairman of the Board
 
                                          By: /s/ PETER C. NELSON
                                            ------------------------------------
                                            Peter C. Nelson
                                            President & Chief Executive Officer
 
                                          California Water Service Company,
                                          a California corporation
 
                                          By: /s/ ROBERT W. FOY
                                            ------------------------------------
                                            Robert W. Foy
                                            Chairman of the Board
 
                                          By: /s/ PETER C. NELSON
                                            ------------------------------------
                                            Peter C. Nelson
                                            President & Chief Executive Officer
 
                                          Dominguez Services Corporation,
                                          a California corporation
 
                                          By: /s/ BRIAN J. BRADY
                                            ------------------------------------
                                            Brian J. Brady
                                            Chairman of the Board and
                                            President & Chief Executive Officer
 
                                          By: /s/ JOHN S. TOOTLE
                                            ------------------------------------
                                            John S. Tootle
 
                                      -46-
<PAGE>   143
 
                                   EXHIBIT A
 
                              AGREEMENT OF MERGER
 
                                   Exhibit A
<PAGE>   144
 
                              AGREEMENT OF MERGER
 
                                       OF
                        CALIFORNIA WATER SERVICE COMPANY
                                      AND
                         DOMINGUEZ SERVICES CORPORATION
 
     This Agreement of Merger is entered into as of this   day of
               ,      , among Dominguez Services Corporation, a California
corporation (herein "DSC"), California Water Service Company, a California
corporation (herein "Subsidiary") and California Water Service Group, a
California corporation (herein "Parent").
 
     1. DSC shall be merged into Subsidiary.
 
     2. Upon such merger, each outstanding share of DSC, other than shares held
by shareholders who perfect their rights as dissenting shareholders under
California law, shall be converted to      shares of the Common Stock of Parent.
 
     3. Upon such merger, the outstanding shares of Subsidiary shall remain
outstanding and are not affected by the merger.
 
     4. The articles of incorporation of Subsidiary are not amended by the
merger.
 
     5. The conversion of shares as provided by this Agreement shall occur
automatically upon the effective date without action by the holders thereof.
 
     6. Fractional shares shall not be issued, but cash shall be paid for any
such fraction in an amount proportionate to the fair value of a whole share as
determined by the board of directors of Parent and in accordance with the
Agreement and Plan of Reorganization referred to in 10 below.
 
     7. Upon such merger, the separate existence of DSC ceases and Subsidiary
shall succeed, without other transfer, to all the rights and property of DSC and
shall be subject to all the debts and liabilities thereof in the same manner as
if Subsidiary had itself incurred them. All rights of creditors and all liens
upon the property of each corporation shall be preserved unimpaired, provided
that such liens upon property of DSC shall be limited to the property affected
thereby immediately prior to the time the merger is effective.
 
     8. Upon the merger becoming effective, DSC, through the persons who were
its officers immediately prior to the merger, shall execute or cause to be
executed such further assignments, assurances or other documents as may be
necessary or desirable to confirm title to properties, assets and rights in
Subsidiary.
 
     9. This Agreement is intended as a plan of reorganization within the
meaning of Section 368 of the Internal Revenue Code.
 
     10. The corporations parties to this Agreement are also parties to an
Agreement and Plan of Reorganization dated November 13, 1998. The two agreements
are intended to be construed together in order to effectuate their purposes.
 
     11. The effective date of the merger is the date upon which a copy of this
Agreement is filed with the Secretary of State of California.
 
                                       A-1
<PAGE>   145
 
     IN WITNESS WHEREOF, the parties have executed this Agreement.
 
                                          CALIFORNIA WATER SERVICE GROUP
 
                                          By:
                                            ------------------------------------
 
                                          By:
                                            ------------------------------------
 
                                          CALIFORNIA WATER SERVICE COMPANY
 
                                          By:
                                            ------------------------------------
 
                                          By:
                                            ------------------------------------
 
                                          DOMINGUEZ SERVICES CORPORATION
 
                                          By:
                                            ------------------------------------
 
                                          By:
                                            ------------------------------------
 
                                       A-2
<PAGE>   146
 
                                   EXHIBIT B
 
                          FORM OF AFFILIATE AGREEMENT
 
                                   Exhibit B
<PAGE>   147
 
                                AFFILIATE LETTER
 
California Water Service Group
1720 North First Street
San Jose, CA 95112
 
Gentlemen:
 
     I have been advised that I might be considered to be an "affiliate" of
Dominguez Services Corporation, a California corporation ("DSC"), for purposes
of paragraphs (c) and (d) of Rule 145 promulgated by the Securities and Exchange
Commission (the "SEC") under the Securities Act of 1933, as amended (the "Act"),
and for purposes of generally accepted accounting principles ("GAAP") as such
term relates to pooling-of-interests accounting treatment for certain business
combinations under GAAP and the interpretations of the SEC or its staff,
including, without limitation, Section 201.01 of the SEC's Codification of
Financial Reporting Policies ("Section 201.01") and the SEC's Staff Accounting
Bulletin No. 65.
 
     California Water Service Group ("CWSG"), California Water Service Company
("Water Company") and DSC have entered into an Agreement and Plan of
Reorganization, dated as of November 13, 1998 (the "Merger Agreement"). Pursuant
to the terms of the Merger Agreement, upon consummation of the Merger described
therein (the "Merger"), I will be entitled to receive shares of CWSG common
stock, no par value ("CWSG Stock"), in exchange for my shares of common stock of
DSC ("DSC Stock"). This agreement is hereinafter referred to as this "Letter
Agreement."
 
     A. I represent and warrant to, and agree with, CWSG as follows;
 
     1. I have read this Letter Agreement and the Merger Agreement and have
discussed their requirements and other applicable limitations upon my ability to
sell, pledge, transfer or otherwise dispose of shares of CWSG Stock and DSC
Stock, to the extent I felt necessary, with my counsel or counsel for DSC.
 
     2. I have been advised that any issuance of shares of CWSG Stock to me
pursuant to the Merger will be registered with the SEC. I have also been
advised, however, that, because I may be an "affiliate" of DSC at the time the
Merger will be submitted for a vote of the shareholders of DSC and my offer,
sale, transfer or other disposition of shares of CWSG Stock has not been
registered under the Act, I shall not make any offer, sale, pledge, transfer or
other disposition of such shares unless (i) such offer, sale, transfer or other
disposition of such shares is subject to an effective registration statement and
to the availability of a prospectus under the Act, (ii) a sale of such shares is
made in conformity with the provisions of Rule 145(d) under the Act (and I agree
to provide those representations as CWSG may reasonably request in order to
determine such conformity) or (iii) in an opinion of counsel, in form and
substance reasonably satisfactory to CWSG, some other exemption from
registration is available with respect to any such proposed disposition of such
shares. I further agree that I will not cause my shares to become dissenting
shares as defined in sec. 1300 of the CGCL.
 
     3. Notwithstanding the foregoing and any other agreements on my part in
connection with CWSG Stock and any other capital stock of CWSG and DSC Stock and
any other capital stock of DSC, I hereby agree that I will not, without prior
written consent of CWSG, pledge, sell or otherwise reduce my risk relative to
any shares of DSC Stock or CWSG Stock (whether received in the Merger or
otherwise) during the period commencing 30 days prior to the effective date of
the Merger and continuing until financial results covering at least thirty (30)
days of combined operations have been published following the effective date of
the Merger within the meaning of Section 201.01; provided, however, that this
paragraph shall not prevent me from selling, transferring or disposing (in each
case, with prior written approval of CWSG) of such number of shares of CWSG
Stock or DSC Stock as will not, in the reasonable judgment of accountants to
CWSG, interfere with or prevent the Merger from being accounted for as a
"pooling-of-interests."
 
                                       B-1
<PAGE>   148
 
Affiliate Letter
Page 2
 
     4. Stop transfer instructions may be given to the transfer agent of DSC
with respect to the shares of DSC Stock and to the transfer agent of CWSG with
respect to the shares of CWSG Stock in connection with the restrictions set
forth herein, and there will be placed on the certificate representing shares of
CWSG Stock I receive pursuant to the Merger, or any certificates delivered in
substitution therefor, a legend stating in substance:
 
     The shares represented by this certificate were issued in a transaction to
     which Rule 145 under the Securities Act of 1933 applies. The shares
     represented by this certificate may only be transferred in accordance with
     the terms of an agreement between the registered holder hereof and CWSG, a
     copy of which agreement is on file at the principal offices of CWSG. A copy
     of such agreement shall be provided to the holder hereof without charge
     upon receipt by CWSG of a written request.
 
     5. Unless a transfer of my shares of CWSG Stock is a sale made in
conformity with the provisions of Rule 145(d) under the Act, or made pursuant to
any effective registration statement under the Act, CWSG reserves the right to
put an appropriate legend on the certificates issued to my transferee.
 
     6. I recognize and agree that the foregoing provisions also apply to (i) my
spouse, (ii) any relative of mine or my spouse occupying my home, (iii) any
trust or estate in which I, my spouse or any such relative owns at least a 10%
beneficial interest or of which any of us serves as trustee, executor or in any
similar capacity and (iv) any corporation or other organization in which I, my
spouse or any such relative owns at least a 10% of any class of equity
securities or of the equity interest.
 
     7. I further recognize that in the event I become a director or officer of
CWSG upon consummation of the Merger, any purchase or sale of the capital stock
of CWSG by me may be subject to liability pursuant to Section 16(b) of the
Securities Exchange Act of 1934, as amended.
 
     8. Execution of this letter should not be construed as an admission on my
part that I am an "affiliate" of DSC as described in the first paragraph of this
Letter Agreement or as a waiver of any rights I may have to object to any claim
that I am such an affiliate on or after that date of this Letter Agreement.
 
     It is understood and agreed that this Letter Agreement shall terminate and
be of no further force and effect if the Merger Agreement is terminated in
accordance with its terms. It is also understood and agreed that this Letter
Agreement shall terminate and be of no further force and effect and the stop
transfer instructions set forth in Paragraph 4 above shall be lifted forthwith
upon the later of (i) such time as financial results covering at least thirty
(30) days of combined operations following the effective date of the Merger have
been published within the meaning of Section 201.01 and (ii) delivery by the
undersigned to CWSG of a copy of a letter from the staff of the SEC, an opinion
of counsel in form and substance reasonably satisfactory to CWSG, or
representations or other evidence reasonably satisfactory to CWSG, to the effect
that a transfer of my shares of CWSG Stock represented by such certificate or
certificates will not violate the Act or any of the rules and regulations of the
SEC thereunder. In addition, it is understood and agreed that the legend set
forth in Paragraph 4 above shall be removed forthwith from the certificate or
certificates representing my shares of CWSG Stock if I shall have delivered to
CWSG a copy of a letter from the staff of the SEC, an opinion of counsel in form
and substance reasonably satisfactory to CWSG or other representations or
evidence reasonably satisfactory to CWSG that a transfer of my shares of CWSG
Stock represented by such certificate or certificates will be a sale made in
conformity with the provisions of Rule 145(d) under the Act, or made pursuant to
an effective registration statement under the Act, or that such legend is not
required for purposes of the Securities Act or the rules and regulation
promulgated thereunder.
 
                                       B-2
<PAGE>   149
 
Affiliate Letter
Page 3
 
     This Letter Agreement shall be binding on my heirs, legal representative
and successors.
 
                                          Very truly yours,
 
                                          --------------------------------------
 
                                          Dated:
                                              ----------------------------------
 
Accepted this                day
of                , 199
 
California Water Service Group
By:
    --------------------------------------------------------
Name:
Title:
 
                                       B-3
<PAGE>   150
 
                               AMENDMENT NO. 1 TO
                      AGREEMENT AND PLAN OF REORGANIZATION
 
     THIS AMENDMENT NO. 1 ("Amendment No. 1") to that certain Agreement and Plan
of Reorganization among the parties hereto and dated as of November 13, 1998
(the "Agreement") is made and entered into as of the 22nd day of March, 1999, by
and among CALIFORNIA WATER SERVICE GROUP, a California Corporation ("CWSG"),
CALIFORNIA WATER SERVICE COMPANY, a California corporation and wholly owned
subsidiary of CWSG ("Water Company"), and DOMINGUEZ SERVICES CORPORATION, a
California corporation ("DSC").
 
     WHEREAS, DSC has received an unsolicited offer from another publicly owned
water utility and has deemed it to be a Superior Offer, and, in response
thereto, CWSG has determined to increase its bid; and
 
     WHEREAS, the above parties deem it to be advisable and in the best interest
of their respective shareholders to enter into this Agreement No. 1; and
 
     WHEREAS, the Boards of Directors of CWSG, Water Company and DSC have
approved the Agreement and the transactions contemplated thereby and have
authorized the officers of the respective parties to take such further actions
as they deem necessary or advisable to carry out the provisions of the
Agreement;
 
     NOW, THEREFORE, on the basis of the foregoing recitals and in consideration
of the mutual covenants, agreements, representations and warranties contained
herein, the parties hereto do covenant and agree as follows:
 
          1. Unless otherwise set forth herein, capitalized terms have the
     meaning set forth in the Agreement.
 
          2. Amend Article I ("DEFINITIONS") of the Agreement to add the
     following definitions:
 
        "Base Numerator" has the meaning set forth in Section 2.3(a).
 
        "Denominator" has the meaning set forth in Section 2.3(a).
 
        "Market Price" has the meaning set forth in Section 2.3(a).
 
          3. Amend Section 2.3, subdivision (a) to read:
 
             2.3 Conversion of DSC Stock. (a) On the Effective Time of the
        Merger, pursuant to the Agreement of Merger, each outstanding share of
        DSC Stock excluding, if any, DSC Perfected Dissenting Shares or shares
        of DSC Stock held by CWSG shall, without any further action on the part
        of DSC or the holders of any such shares, be converted into the right to
        receive a number of shares of CWSG Stock determined as set forth below
        (the "Conversion Ratio"). The Conversion Ratio shall be equal to $33.75
        (the "Base Numerator") divided by either (i) the Market Price of CWSG
        Stock if the Market Price of CWSG Stock is no greater than $27.00 and no
        less than $22.65, (ii) $27.00 if the Market Price of CWSG Stock is
        greater than $27.00, in which case the Conversion Ratio shall equal
        1.25, or (iii) $22.65, if the price of CWSG Stock is less than $22.65,
        in which case the Conversion Ratio shall be 1.49 (as applicable, the
        "Denominator"). The "Market Price" of CWSG Stock means the average
        closing price per share of CWSG Stock on the NYSE for each of the twenty
        consecutive trading days prior to and including the fifth trading day
        prior to the Closing Date.
 
          4. Amend Section 9.1 as follows:
 
             9.1 Shareholder Approval. The Agreement and the transactions
        contemplated hereby shall have received all requisite approvals of the
        shareholders of DSC no later than the later of (i) May 7, 1999 or (i) 45
        days after the effective date of the Registration Statement, on S-4
        filed with the SEC on January 28, 1999, and all amendments thereafter.
 
          5. In all other respects the Agreement is hereby ratified and
     affirmed.
 
                                       -1-
<PAGE>   151
 
                            [SIGNATURE PAGE FOLLOWS]
 
                                       -2-
<PAGE>   152
 
     IN WITNESS WHEREOF, the parties to this Amendment No. 1 have duly executed
this Amendment No. 1 as of the day and year first above written.
 
                                          CALIFORNIA WATER SERVICE GROUP,
                                          a California corporation
 
                                          By: /s/ ROBERT W. FOY
                                            ------------------------------------
                                            Robert W. Foy
                                            Chairman of the Board
 
                                          By: /s/ PETER C. NELSON
                                            ------------------------------------
                                            Peter C. Nelson
                                            President & Chief Executive Officer
 
                                          CALIFORNIA WATER SERVICE COMPANY,
                                          a California corporation
 
                                          By: /s/ ROBERT W. FOY
                                            ------------------------------------
                                            Robert W. Foy
                                            Chairman of the Board
 
                                          By: /s/ PETER C. NELSON
                                            ------------------------------------
                                            Peter C. Nelson
                                            President & Chief Executive Officer
 
                                          DOMINGUEZ SERVICES CORPORATION,
                                          a California corporation
 
                                          By: /s/ BRIAN J. BRADY
                                            ------------------------------------
                                            Brian J. Brady
                                            Chairman of the Board and
                                            President & Chief Executive Officer
 
                                          By: /s/ JOHN S. TOOTLE
                                            ------------------------------------
                                            John S. Tootle
                                            Chief Financial Officer
 
                                       -3-
<PAGE>   153
 
                                   APPENDIX B
 
                     [PAINEWEBBER INCORPORATED LETTERHEAD]
 
April 7, 1999
 
Board of Directors
Dominguez Services Corporation
21718 South Alameda Street
Long Beach, CA 90810
 
Madame and Gentlemen:
 
     Dominguez Services Corporation (the "Company"), California Water Service
Group ("California Water") and California Water Service Company (the
"Subsidiary") have entered into an Agreement and Plan of Reorganization (which,
together with the Amendment No. 1 to the Agreement and Plan of Reorganization,
constitute the "Agreement") pursuant to which the Company will merge with and
into Subsidiary (the "Merger"). Capitalized terms used herein without definition
have the meanings assigned to them in the Agreement. At the Effective Time of
the Merger, pursuant to the Agreement, each outstanding share of the Company's
common stock, $1.00 par value ("Company Common Stock"), excluding, if any,
Perfected Dissenting Shares or shares of the Company's Common Stock held by
California Water shall, without further action on the part of the Company or the
holders of any such Company Common Stock, be converted into the right to receive
a number of shares of California Water common stock, no par value, determined as
set forth below. The Conversion Ratio shall be equal to $33.75 divided by either
(i) the Market Price (defined as the average closing price per share of
California Water common stock on the New York Stock Exchange for each of the
twenty consecutive trading days prior to and including the fifth trading day
prior to the Closing Date) of California Water common stock if the Market Price
of California Water common stock is no greater than $27.00 and no less than
$22.65, (ii) $27.00 if the Market Price of California Water common stock is
greater than $27.00, in which case the Conversion Ratio shall equal 1.25, or
(iii) $22.65 if the Market Price of California Water common stock is less than
$22.65, in which case the Conversion Ratio shall equal 1.49.
 
     You have asked us whether or not, in our opinion, the Conversion Ratio is
fair, from a financial point of view to the shareholders of the Company.
 
     In arriving at the opinion set forth below, we have, among other things:
 
          (1) Reviewed, among other public information, the Company's Annual
     Reports, Forms 10-K and related financial information for the four fiscal
     years ended December 31, 1998;
 
          (2) Reviewed, among other public information, California Water's
     Annual Reports, Forms 10-K and related financial information for the four
     fiscal years ended December 31, 1998;
 
          (3) Reviewed certain information, including financial forecasts,
     relating to the business, earnings, cash flow, assets and prospects of the
     Company and California Water, furnished to us by the Company and California
     Water, respectively;
 
          (4) Conducted discussions with members of senior management of the
     Company and California Water concerning their respective businesses and
     prospects;
 
          (5) Compared the historical market prices and trading activity for the
     Shares and the California Water shares with those of certain publicly
     traded companies which we deemed to be relevant;
 
          (6) Compared the financial position and results of operations of the
     Company and California Water with those of certain publicly traded
     companies which we deemed to be relevant;
<PAGE>   154
Board of Directors
Dominguez Services Corporation
April 7, 1999
Page 2
 
          (7) Compared the proposed financial terms of the Merger with the
     financial terms of certain other mergers and acquisitions which we deemed
     to be relevant;
 
          (8) Considered the potential pro forma effects of the Merger on
     California Water;
 
          (9) Reviewed the Agreement and Plan of Reorganization and Amendment
     No. 1 to the Agreement and Plan of Reorganization presented to the
     Company's Board of Directors; and
 
          (10) Reviewed such other financial studies and analyses and performed
     such other investigations and took into account such other matters as we
     deemed necessary including our assessment of regulatory, general economic,
     market and monetary conditions.
 
     In preparing our opinion, we have relied on the accuracy and completeness
of all information that was publicly available, supplied or otherwise
communicated to us by or on behalf of the Company and California Water and we
have not independently verified such information. With respect to the financial
forecasts examined by us, we have assumed, with your consent, that they were
reasonably prepared and reflect the best currently available estimates and good
faith judgments of the managements of the Company and California Water as to the
future performance of the Company and California Water, respectively. We have
also relied upon assurances of the managements of the Company and California
Water that they are unaware of any facts that would make the information or
financial forecasts provided to us incomplete or misleading. We have not made an
independent evaluation or appraisal of the assets or liabilities (contingent or
otherwise) of the Company or California Water, nor have we been furnished with
any such evaluations or appraisals. We have also assumed, with your consent,
that: (i) the Merger will be accounted for under the pooling-of-interests method
of accounting; (ii) the Merger will be a tax-free reorganization; and (iii) any
material liabilities (contingent or otherwise, known or unknown) of the Company
or California Water are as set forth in the consolidated financial statements of
the Company and California Water, respectively.
 
     Our opinion is directed to the Board of Directors of the Company and does
not constitute a recommendation to any shareholder of the Company as to how any
such shareholder should vote on the Merger.
 
     This opinion does not address the relative merits of the Merger and any
other transactions or business strategies that may have been discussed by the
Board of Directors of the Company as alternatives to the Merger or the decision
of the Board of Directors of the Company to proceed with the Merger. PaineWebber
Incorporated was not requested or authorized to solicit, and did not solicit,
potential purchasers of the Company. No opinion is expressed herein as to the
price at which California Water shares may trade at any time subsequent to the
Merger. Our opinion is based on regulatory, general economic, market and
monetary conditions existing on the date hereof.
 
     In the ordinary course of our business, we may trade in the securities of
the Company and California Water for our own account and for the accounts of our
customers and, accordingly, may at any time hold long or short positions in such
securities.
 
     PaineWebber Incorporated is currently acting as financial advisor to the
Company in connection with the Merger and will receive a fee in connection with
the rendering of this opinion and upon consummation of the Merger. In the past,
PaineWebber Incorporated and its affiliates have provided investment banking
services to the Company and have received fees for rendering these services. In
addition, a representative of PaineWebber Incorporated, is a member of the Board
of Directors of the Company.
 
     On the basis of, and subject to the foregoing, we are of the opinion that,
as of the date hereof, the Conversion Ratio is fair, from a financial point of
view, to the shareholders of the Company.
<PAGE>   155
Board of Directors
Dominguez Services Corporation
April 7, 1999
Page 3
 
     This opinion has been prepared at the request and for the use of the Board
of Directors of the Company in connection with the Merger and shall not be
reproduced, summarized, described or referred to, provided to any person or
otherwise made public or used for any other purpose without the prior written
consent of PaineWebber Incorporated; provided, however, that this letter may be
reproduced in full in a Proxy Statement/Prospectus relating to the Merger.
 
                                          Very truly yours,
 
                                          PAINEWEBBER INCORPORATED
 
                                             /s/ PAINEWEBBER INCORPORATED
 
                                          --------------------------------------
<PAGE>   156
 
                                   APPENDIX C
 
                     [PAINEWEBBER INCORPORATED LETTERHEAD]
 
November 13, 1998
 
Board of Directors
Dominguez Services Corporation
21718 South Alameda Street
Long Beach, CA 90810
 
Madame and Gentlemen:
 
     Dominguez Services Corporation (the "Company"), California Water Service
Group ("California Water") and California Water Service Company (the
"Subsidiary") propose to enter into an Agreement and Plan of Reorganization (the
"Agreement") pursuant to which the Company will merge with and into Subsidiary
(the "Merger"), in which each share of the Company's common stock, par value
$1.00 (the "Shares") will be converted into the right to receive 1.18 (the
"Exchange Ratio") shares of California Water common stock, no par value.
 
     You have asked us whether or not, in our opinion, the Exchange Ratio is
fair, from a financial point of view to the shareholders of the Company.
 
     In arriving at the opinion set forth below, we have, among other things:
 
      (1) Reviewed, among other public information, the Company's Annual
Reports, Forms 10-K and related financial information for the four fiscal years
ended December 31, 1997 and a draft of the Company's Form 10-Q and the related
unaudited financial information for the nine months ended September 30, 1998;
 
      (2) Reviewed, among other public information, California Water's Annual
Reports, Forms 10-K and related financial information for the four fiscal years
ended December 31, 1997 and California Water's Form 10-Q and the related
unaudited financial information for the nine months ended September 30, 1998;
 
      (3) Reviewed certain information, including financial forecasts, relating
to the business, earnings, cash flow, assets and prospects of the Company and
California Water, furnished to us by the Company and California Water,
respectively;
 
      (4) Conducted discussions with members of senior management of the Company
and California Water concerning their respective businesses and prospects;
 
      (5) Compared the historical market prices and trading activity for the
Shares and the California Water shares with those of certain publicly traded
companies which we deemed to be relevant;
 
      (6) Compared the financial position and results of operations of the
Company and California Water with those of certain publicly traded companies
which we deemed to be relevant;
 
      (7) Compared the proposed financial terms of the Merger with the financial
terms of certain other mergers and acquisitions which we deemed to be relevant;
 
      (8) Considered the potential pro forma effects of the Merger on California
Water;
 
      (9) Reviewed a draft of the Agreement in the form presented to the
Company's Board of Directors; and
 
     (10) Reviewed such other financial studies and analyses and performed such
other investigations and took into account such other matters as we deemed
necessary including our assessment of regulatory, general economic, market and
monetary conditions.
<PAGE>   157
 
Board of Directors
Dominguez Services Corporation
November 13, 1998
Page 2
 
     In preparing our opinion, we have relied on the accuracy and completeness
of all information that was publicly available, supplied or otherwise
communicated to us by or on behalf of the Company and California Water and we
have not independently verified such information. With respect to the financial
forecasts examined by us, we have assumed, with your consent, that they were
reasonably prepared and reflect the best currently available estimates and good
faith judgments of the managements of the Company and California Water as to the
future performance of the Company and California Water, respectively. We have
also relied upon assurances of the managements of the Company and California
Water that they are unaware of any facts that would make the information or
financial forecasts provided to us incomplete or misleading. We have not made an
independent evaluation or appraisal of the assets or liabilities (contingent or
otherwise) of the Company or California Water, nor have we been furnished with
any such evaluations or appraisals. We have also assumed, with your consent,
that: (i) the Merger will be accounted for under the pooling-of-interests method
of accounting; (ii) the Merger will be a tax-free reorganization; and (iii) any
material liabilities (contingent or otherwise, known or unknown) of the Company
or California Water are as set forth in the consolidated financial statements of
the Company and California Water, respectively.
 
     Our opinion is directed to the Board of Directors of the Company and does
not constitute a recommendation to any shareholder of the Company as to how any
such shareholder should vote on the Merger.
 
     This opinion does not address the relative merits of the Merger and any
other transactions or business strategies that may have been discussed by the
Board of Directors of the Company as alternatives to the Merger or the decision
of the Board of Directors of the Company to proceed with the Merger. PaineWebber
Incorporated was not requested or authorized to solicit, and did not solicit,
potential purchasers of the Company. No opinion is expressed herein as to the
price at which California Water shares may trade at any time subsequent to the
Merger. Our opinion is based on regulatory, general economic, market and
monetary conditions existing on the date hereof.
 
     In the ordinary course of our business, we may trade in the securities of
the Company and California Water for our own account and for the accounts of our
customers and, accordingly, may at any time hold long or short positions in such
securities.
 
     PaineWebber Incorporated is currently acting as financial advisor to the
Company in connection with the Merger and will receive a fee in connection with
the rendering of this opinion and upon consummation of the Merger. In the past,
PaineWebber Incorporated and its affiliates have provided investment banking
services to the Company and have received fees for rendering these services. In
addition, a representative of PaineWebber Incorporated, is a member of the Board
of Directors of the Company.
 
     On the basis of, and subject to the foregoing, we are of the opinion that,
as of the date hereof, the Exchange Ratio is fair, from a financial point of
view, to the shareholders of the Company.
 
     This opinion has been prepared at the request and for the use of the Board
of Directors of the Company in connection with the Merger and shall not be
reproduced, summarized, described or referred to, provided to any person or
otherwise made public or used for any other purpose without the prior written
consent of PaineWebber Incorporated; provided, however, that this letter may be
reproduced in full in a Proxy Statement/Prospectus relating to the Merger.
 
                                          Very truly yours,
 
                                          PAINEWEBBER INCORPORATED
 
                                             /s/ PAINEWEBBER INCORPORATED
 
                                          --------------------------------------
<PAGE>   158
 
                                   APPENDIX D
 
                          CALIFORNIA CORPORATIONS CODE
                                   CHAPTER 13
                               DISSENTERS' RIGHTS
 
SECTION 1300. Right to Require Purchase -- "Dissenting Shares" and "Dissenting
Shareholder" Defined
 
     (a) If the approval of the outstanding shares (Section 152) of a
corporation is required for a reorganization under subdivisions (a) and (b) or
subdivision (e) or (f) of Section 1201, each shareholder of the corporation
entitled to vote on the transaction and each shareholder of a subsidiary
corporation in a short-form merger may, by complying with this chapter, require
the corporation in which the shareholder holds shares to purchase for cash at
their fair market value the shares owned by the shareholder which are dissenting
shares as defined in subdivision (b). The fair market value shall be determined
as of the day before the first announcement of the terms of the proposed
reorganization or short-form merger, excluding any appreciation or depreciation
in consequence of the proposed action, but adjusted for any stock split, reverse
stocks or share dividend which becomes effective thereafter.
 
     (b) As used in this chapter, "dissenting shares" means shares which come
within all of the following descriptions:
 
          (1) Which were not immediately prior to the reorganization or
     short-form merger either (A) listed on any national securities exchange
     certified by the Commissioner of Corporations under subdivision (o) of
     Section 25100 or (B) listed on the list of OTC margin stocks issued by the
     Board of Governors of the Federal Reserve System, and the notice of meeting
     of shareholders to act upon the reorganization summarizes this Section and
     Sections 1301, 1302, 1303 and 1304; provided, however, that this provision
     does apply to any shares with respect to which there exists any restriction
     on transfer imposed by the corporation or by any law or regulation; and
     provided, further, that this provision does not apply to any class of
     shares described in subparagraph (A) or (B) if demands for payment are
     filed with respect to 5 percent or more of the outstanding shares of that
     class.
 
          (2) Which were outstanding on the date for the determination of
     shareholders entitled to vote on the reorganization and (A) were not voted
     in favor of the reorganization and (A) were not voted in favor of the
     reorganization or, (B) if described in subparagraph (A) or (B) of paragraph
     (I) (without regard to the provisos in that paragraph), were voted against
     the reorganization, or which were held of record on the effective date of a
     short-form merger; provided, however, that subparagraph (A) rather than
     subparagraph (B) of this paragraph applies in any case where the approval
     required by Section 1201 is sought by written consent rather than at a
     meeting.
 
          (3) Which the dissenting shareholder has demanded that the corporation
     purchase at their fair market value, in accordance with Section 1301.
 
          (4) Which the dissenting shareholder has submitted the endorsement, in
     accordance with Section 1302.
 
          (c) As used in this chapter, "dissenting shareholder" means the
     recordholder of dissenting shares and includes a transferee of record.
 
SECTION 1301. Demand for Purchase
 
     (a) If, in the case of a reorganization, any shareholders of a corporation
have a right under Section 1300, subject to compliance with paragraphs (3) and
(4) of subdivision (b) thereof, to require the corporation to purchase their
shares for cash, such corporation shall mail to each such shareholder a notice
of the approval of the reorganization by its outstanding shares (Section 152)
within 10 days after the date of such approval accompanied by a copy of Sections
1300, 1302, 1303, 1304 and this section, a statement of the price determined by
the corporation to represent the fair market value of the dissenting shares, and
a brief description of the procedure to be followed if the shareholder desires
to exercise the shareholder's rights under
                                       -1-
<PAGE>   159
 
such sections. The statement of price constitutes an offer by the corporation to
purchase at the price stated any dissenting shares as defined in subdivision (b)
of Section 1300, unless they lose their status as dissenting shares under
Section 1309.
 
     (b) Any shareholder who has a right to require the corporation to purchase
the shareholder's shares for cash under Section 1300, subject to compliance with
paragraphs (3) and (4) of subdivision (b) thereof, and who desires the
corporation to purchase such shares shall make written demand upon the
corporation for the purchase of such shares and payment to the shareholder in
cash of their fair market value. The demand is not effective for any purpose
unless it is received by the corporation or any transfer agent thereof ( I ) in
the case of shares described in clause (i) or (ii) of paragraph (I) of
subdivision (b) of Section 1300 (without regard to the provisos in that
paragraph), not later than the date of the shareholders' meeting to vote upon
the reorganization or (2) in any other case within 30 days after the date on
which the notice of the approval by the outstanding shares pursuant to
subdivision (a) or the notice pursuant to subdivision (i) of Section 1110 was
mailed to the shareholder.
 
     (c) The demand shall state the number and class of the shares held of
record by the shareholder which the shareholder demands that the corporation
purchase and shall contain a statement of what shareholder claims to be the fair
market value of those shares as of the day before the announcement of the
proposed reorganization or short-form merger. The statement of fair market value
constitutes an offer by the shareholder to sell the shares at such price.
 
SECTION 1302. Endorsement of Shares
 
     Within 30 days after the date on which notice of the approval by the
outstanding shares or the notice pursuant to subdivision (i) of Section 1110 was
mailed to the shareholder, the shareholder shall submit to the corporation at
its principal office or at the office of any transfer agent thereof, (a) if the
shares are certificated securities, the shareholder's certificates representing
any shares which the shareholder demands that the corporation purchase, to be
stamped or endorsed with a statement that the shares are dissenting shares or to
be exchanged for certificates of appropriate denomination so stamped or endorsed
or (b) if the shares are uncertificated securities, written notice of the number
of shares which the shareholder demands that the corporation purchase. Upon
subsequent transfers of the dissenting shares on the books of the corporation,
the new certificates, initial transaction statement. and other written
statements issued therefor shall bear a like statement, together with the name
of the original dissenting holder of the shares.
 
SECTION 1303. Agreed Price -- Time for Payment
 
     (a) If the corporation and the shareholder agree that the shares are
dissenting shares and agree upon the price of the shares, the dissenting
shareholder is entitled to the agreed price with interest thereon at the legal
rate on judgments from the date of the agreement. Any agreements fixing the fair
market value of any dissenting shares as between the corporation and the holders
thereof shall be filed with he secretary of the corporation.
 
     (b) Subject to the provisions of Section 1306, payment of the fair market
value of dissenting shares shall be made within 30 days after the amount thereof
has been agreed or within 30 days after the amount thereof has been agreed or
within 30 days after any statutory or contractual conditions to the
reorganization are satisfied. whichever is later, and in the case of
certificated securities, subject to surrender of the certificates therefor,
unless provided otherwise by agreement.
 
SECTION 1304. Dissenter's Action to Enforce Payment
 
     (a) If the corporation denies that the shares are dissenting shares, or the
corporation and the shareholder fail to agree upon the fair market value of the
shares, then the shareholder demanding purchase of such shares as dissenting
shares or any interested corporation, within six months after the date on which
notice of the approval by the outstanding shares (Section 152) or notice
pursuant to subdivision (i) of Section 1110 was mailed to the shareholder, but
not thereafter, may file a complaint in the superior court of the proper county
 
                                       -2-
<PAGE>   160
 
praying the court to determine whether the shares are dissenting shares or the
fair market value of the dissenting shares or both or may intervene in any
action pending on such a complaint.
 
     (b) Two or more dissenting shareholders may join as plaintiffs or be joined
as defendants in any such action and two or more such actions may be
consolidated.
 
     (c) On the trial of the action, the court shall determine the issues. If
the status of the shares as dissenting shares is in issue, the court shall first
determine that issue. If the fair market value of the dissenting shares is in
issue, the court shall determined, or shall appoint one or more impartial
appraisers to determine, the fair market value of the shares.
 
SECTION 1305. Appraisers' Report -- Payment -- Costs
 
     (a) If the court appoints an appraiser or appraisers, they shall proceed
forthwith to determine the fair market value per share. Within the time fixed by
the court, the appraisers, or a majority of them, shall make and file a report
in the office of the clerk of the court. Thereupon, on the motion of any party,
the report shall be submitted to the court and considered on such evidence as
the court considers relevant. If the court finds the report reasonable, the
court may confirm it.
 
     (b) If a majority of the appraisers appointed fail to make and file a
report within 10 days from the date of their appointment or within such further
time as may be allowed by the court or the report is not confirmed by the court,
the court shall determine the fair market value of the dissenting shares.
 
     (c) Subject to the provisions of Section 1306, judgment shall be rendered
against the corporation for payment of an amount equal to the fair market value
of each dissenting share multiplied by the number of dissenting shares which any
dissenting shareholder who is a party, or who has intervened, is entitled to
require the corporation to purchase, with interest thereon at the legal rate
from the date on which judgment was entered.
 
     (d) Any such judgment shall be payable forthwith with respect to
uncertificated securities and, with respect to certificated securities, only
upon the endorsement and delivery to the corporation of the certificates for the
shares described in the judgment. Any party may appeal from the judgment.
 
     (e) The costs of the action, including reasonable compensation to the
appraisers to be fixed by the court, shall be assessed or apportioned as the
court considers equitable. but, if the appraisal exceeds the price offered by
the corporation, the corporation shall pay the costs (including in the
discretion of the court attorneys' fees, fees of expert witnesses and the
interest at the legal rate on judgments from the date of compliance with
Sections 1300, 1301 and 1302 if the value awarded by the court for the shares is
more than 125 percent of the price offered by the corporation under subdivision
(a) of Section 1301).
 
SECTION 1306. Dissenting Shareholder's Status as Creditor
 
     To the extent that the provisions of Chapter 5 prevent the payment to any
holders of dissenting shares of their fair market value, they shall become
creditors of the corporation for the amount thereof together with interest at
the legal rate on judgments until the date of payment, but subordinate to all
other creditors in any liquidation proceeding, such debt to be payable when
permissible under the provisions of Chapter 5.
 
SECTION 1307. Dividends Paid as Credit Against Payment
 
     Cash dividends declared and paid by the corporation upon the dissenting
shares after the date of approval of the reorganization by the outstanding
shares (Section 152) and prior to payment for the shares by the corporation
shall be credited against the total amount to be paid by the corporation
therefor.
 
SECTION 1308. Continuing Rights and Privileges of Dissenting Shareholders
 
     Except as expressly limited in this chapter, holders of dissenting shares
continue to have all the rights and privileges incident to their shares, until
the fair market value of their shares is agreed upon or determined. A dissenting
shareholder may not withdraw a demand for payment unless the corporation
consents thereto
                                       -3-
<PAGE>   161
 
SECTION 1309. Termination of Dissenting Shareholder Status
 
     Dissenting shares lose their status as dissenting shares and the holders
thereof cease to be dissenting shareholders and cease to be entitled to require
the corporation to purchase their shares upon the happening of any of the
following:
 
          (a) The corporation abandons the reorganization. Upon abandonment of
     the reorganization, the corporation shall pay on demand to any dissenting
     shareholder who has initiated proceedings in good faith under this chapter
     all necessary expenses incurred in such proceedings and reasonable
     attorneys' fees.
 
          (b) The shares are transferred prior to their submission for
     endorsement in accordance with Section 1302 or are surrendered for
     conversion into shares of another class in accordance with the articles.
 
          (c) The dissenting shareholder and the corporation do not agree upon
     the status of the shares as dissenting shares or upon the purchase price
     for the shares, and neither files a complaint or intervenes in a pending
     action as provided in Section 1304, within six months after the date on
     which notice of the approval by the outstanding shares or notice pursuant
     to subdivision (i) of Section 1110 was mailed to the shareholder.
 
          (d) The dissenting shareholder, with the consent of the corporation,
     withdraws the shareholder's demand for purchase of the dissenting shares.
 
                                       -4-


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