AMERICAN DISPOSAL SERVICES INC
S-3, 1998-03-13
REFUSE SYSTEMS
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<PAGE>
 
    AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON MARCH 13, 1998
 
                                                       REGISTRATION NO. 333-
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
 
                      SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C. 20549
 
                               ---------------
 
                                   FORM S-3
                            REGISTRATION STATEMENT
                                     UNDER
                          THE SECURITIES ACT OF 1933
 
                               ---------------
 
                       AMERICAN DISPOSAL SERVICES, INC.
            (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)
 
         DELAWARE                    4953                    13-3858494
     (STATE OR OTHER       (PRIMARY STANDARD INDUSTRIAL   (I.R.S. EMPLOYER 
     JURISDICTION OF       CLASSIFICATION CODE NUMBER)    IDENTIFICATION NO.) 
     INCORPORATION OR
      ORGANIZATION)
                               ---------------
 
                             745 MCCLINTOCK DRIVE
                                   SUITE 230
                          BURR RIDGE, ILLINOIS 60521
                                (630) 655-1105
  (ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING AREA CODE, OF
                   REGISTRANT'S PRINCIPAL EXECUTIVE OFFICES)
 
                               ---------------
 
                              ANN L. STRAW, ESQ.
                       AMERICAN DISPOSAL SERVICES, INC.
                             745 MCCLINTOCK DRIVE
                                   SUITE 230
                          BURR RIDGE, ILLINOIS 60521
                                (630) 655-1105
(NAME, ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING AREA CODE,
                             OF AGENT FOR SERVICE)
 
                               ---------------
 
                                  COPIES TO:
 
      STEPHEN W. RUBIN, ESQ.                   HOWARD L. SHECTER, ESQ.
        PROSKAUER ROSE LLP                   MORGAN, LEWIS & BOCKIUS LLP
           1585 BROADWAY                           101 PARK AVENUE
     NEW YORK, NEW YORK 10036                 NEW YORK, NEW YORK 10178
          (212) 969-3000                           (212) 309-6000
 
                               ---------------
 
  APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE OF SECURITIES TO THE
PUBLIC: As soon as possible after the Registration Statement becomes
effective.
 
                               ---------------
 
  If the only securities being registered on this Form are being offered
pursuant to dividend or interest reinvestment plans, please check the
following box: [_]
 
  If any of the securities being registered on this Form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, other than securities offered only in connection with dividend or
interest reinvestment plans, check the following box: [_]
 
  If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following
box and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering. [_]
 
  If this Form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. [_]
 
  If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box. [_]
 
                               ---------------
 
                        CALCULATION OF REGISTRATION FEE
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                                   PROPOSED        PROPOSED
                                                   MAXIMUM          MAXIMUM       AMOUNT OF
TITLE OF EACH CLASS OF SECURITIES  AMOUNT TO BE OFFERING PRICE     AGGREGATE     REGISTRATION
        TO BE REGISTERED            REGISTERED   PER SHARE(1)  OFFERING PRICE(1)    FEE(1)
- ---------------------------------------------------------------------------------------------
<S>                                <C>          <C>            <C>               <C>
    Common Stock, par value
     $.01 per share........         4,600,000      $35.125       $161,575,000      $47,665
</TABLE>
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
 
(1) The price stated is estimated solely for the purpose of calculating the
    registration fee pursuant to Rule 457(c) under the Securities Act of 1933
    based on the average of the high and low prices reported for the Common
    Stock on the Nasdaq National Market on March 9, 1998.
 
  THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT
SHALL FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS
REGISTRATION STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH
SECTION 8(A) OF THE SECURITIES ACT OF 1933 OR UNTIL THE REGISTRATION STATEMENT
SHALL BECOME EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID
SECTION 8(A), MAY DETERMINE.
 
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
<PAGE>
 
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+INFORMATION CONTAINED HEREIN IS SUBJECT TO COMPLETION OR AMENDMENT. A         +
+REGISTRATION STATEMENT RELATING TO THESE SECURITIES HAS BEEN FILED WITH THE   +
+SECURITIES AND EXCHANGE COMMISSION. THESE SECURITIES MAY NOT BE SOLD NOR MAY  +
+OFFERS TO BUY BE ACCEPTED PRIOR TO THE TIME THE REGISTRATION STATEMENT        +
+BECOMES EFFECTIVE. THIS PROSPECTUS SHALL NOT CONSTITUTE AN OFFER TO SELL OR   +
+THE SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE      +
+SECURITIES IN ANY STATE IN WHICH SUCH OFFER, SOLICITATION OR SALE WOULD BE    +
+UNLAWFUL PRIOR TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS OF  +
+ANY SUCH STATE.                                                               +
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 
                  SUBJECT TO COMPLETION, DATED MARCH 13, 1998
 
                                4,000,000 SHARES
 
                       AMERICAN DISPOSAL SERVICES, INC.
                                    [LOGO]

                                 COMMON STOCK
 
                               ----------------
 
  Of the 4,000,000 shares of Common Stock offered hereby, 1,488,629 shares are
being issued and sold by American Disposal Services, Inc. (the "Company") and
2,511,371 shares are being sold by certain selling stockholders (the "Selling
Stockholders"). See "Principal and Selling Stockholders." The Company will not
receive any of the proceeds from the sale of shares by the Selling
Stockholders. The Company's Common Stock is traded on the Nasdaq National
Market under the symbol "ADSI." On March 11, 1998, the last sale price of the
Common Stock as reported by the Nasdaq National Market was $36.8125 per share.
See "Price Range of Common Stock."
 
  SEE "RISK FACTORS" BEGINNING ON PAGE 6 FOR A DISCUSSION OF CERTAIN RISK
FACTORS THAT SHOULD BE CONSIDERED BY PROSPECTIVE PURCHASERS OF THE SHARES OF
COMMON STOCK OFFERED HEREBY.
 
                               ----------------
THESE SECURITIES  HAVE NOT BEEN APPROVED  OR DISAPPROVED BY THE  SECURITIES AND
 EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE SECURITIES
 AND EXCHANGE  COMMISSION OR ANY  STATE SECURITIES COMMISSION PASSED  UPON THE
  ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY
  IS A CRIMINAL OFFENSE.
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                                                    PROCEEDS TO
                                  PRICE TO UNDERWRITING PROCEEDS TO   SELLING
                                   PUBLIC  DISCOUNT(1)  COMPANY(2)  STOCKHOLDERS
- --------------------------------------------------------------------------------
<S>                               <C>      <C>          <C>         <C>
Per Share.......................    $          $            $           $
Total(3)........................   $          $            $           $
</TABLE>
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
(1) See "Underwriting" for information concerning indemnification of the
    Underwriters and other information.
(2) Before deducting expenses of the offering payable by the Company estimated
    at $       .
(3) The Underwriters have been granted an option by the Company, exercisable
    within 30 days from the date hereof, to purchase up to 600,000 additional
    shares of Common Stock, at the Price to Public per share, less the
    Underwriting Discount, for the purpose of covering over-allotments, if any.
    If the Underwriters exercise such option in full, the total Price to
    Public, Underwriting Discount and Proceeds to Company will be $   , $
    and $   , respectively. See "Underwriting."
                               ----------------
 
  The shares of Common Stock are offered by the Underwriters when, as and if
delivered to and accepted by them, subject to their right to withdraw, cancel
or reject orders in whole or in part and subject to certain other conditions.
It is expected that delivery of the certificates representing the shares will
be made against payment on or about      ,1998, at the offices of CIBC
Oppenheimer Corp., CIBC Oppenheimer Tower, One World Financial Center, New
York, New York 10281.
 
                               ----------------
 
                          Joint Book-Running Managers
 
CIBC OPPENHEIMER                                    DONALDSON, LUFKIN & JENRETTE
                                    SECURITIES CORPORATION
 
                  The date of this Prospectus is      , 1998.
<PAGE>
 
                       AMERICAN DISPOSAL SERVICES, INC.
 
                              CURRENT OPERATIONS
 
  MAP SHOWING THE LOCATIONS OF THE COMPANY'S COLLECTION OPERATIONS, COLLECTION
ACQUISITIONS, LANDFILLS, TRANSFER STATIONS AND CORPORATE OFFICE.
 
 
 
 
                     -------------------------------------
 
  CERTAIN PERSONS PARTICIPATING IN THIS OFFERING MAY ENGAGE IN TRANSACTIONS
THAT STABILIZE, MAINTAIN, OR OTHERWISE AFFECT THE PRICE OF THE COMMON STOCK
OFFERED HEREBY, INCLUDING OVER-ALLOTMENT, STABILIZING TRANSACTIONS, SYNDICATE
SHORT COVERING TRANSACTIONS, PENALTY BIDS AND PASSIVE MARKET MAKING. FOR A
DESCRIPTION OF THESE ACTIVITIES, SEE "UNDERWRITING."
 
                                       2
<PAGE>
 
                               PROSPECTUS SUMMARY
 
  The following summary is qualified in its entirety by the more detailed
information and the Company's consolidated financial statements (including the
notes thereto) appearing elsewhere in this Prospectus. Unless otherwise
indicated, all financial information, share and per share data in this
Prospectus: (i) give effect to an exchange of the Company's common stock, par
value $.01 per share ("Common Stock"), in connection with the formation of a
holding company, effective as of January 1, 1996; (ii) give effect to a 13.5
for 1 stock split consummated on May 31, 1996; (iii) exclude 2,059,358 shares
of Common Stock of the Company issuable upon exercise of outstanding warrants
and stock options; and (iv) assume no exercise of the Underwriters' over-
allotment option. As used in this Prospectus, the terms "Company" and "American
Disposal Services" refer collectively to American Disposal Services, Inc. and
its subsidiaries, unless the context otherwise requires.
 
                              --------------------
 
                                  THE COMPANY
 
  American Disposal Services is a regional, integrated, non-hazardous solid
waste services company that provides solid waste collection, transfer and
disposal services primarily in the Midwest and in the Northeast. The Company
owns nine solid waste landfills and owns, operates or has exclusive contracts
to receive waste from 20 transfer stations. The Company's operations cover six
primary operating regions and its landfills and transfer stations are supported
by 17 collection divisions, which currently serve over 400,000 residential,
commercial and industrial customers. The Company has adopted an acquisition-
based growth strategy and intends to continue its expansion, generally in its
existing and proximate markets. Since January 1993, the Company has acquired 70
solid waste businesses, including eight solid waste landfills and 66 solid
waste collection companies.
 
  The Company began its operations in the Midwest and currently has operations
in the following 12 states: Arkansas, Connecticut, Illinois, Indiana, Kansas,
Kentucky, Massachusetts, Missouri, Ohio, Oklahoma, Pennsylvania and Rhode
Island. The Company's objective is to build a large profitable fully-integrated
solid waste services company with an established market presence in secondary
markets. The Company expects the current consolidation trends in the solid
waste industry to continue as many independent landfill and collection
operators lack the capital resources, management skills and technical expertise
necessary to operate in compliance with stringent environmental and other
governmental regulations.
 
  The Company's operating program generally involves a four-step process: (i)
acquiring solid waste landfills in markets that are within approximately 125
miles of significant metropolitan centers; (ii) securing captive waste streams
for its landfills through the acquisition or development of transfer stations
serving those markets, through acquisitions of collection companies and by
entering into long-term contracts directly with customers or collection
companies; (iii) making "tuck-in" acquisitions of collection companies to
further penetrate its target markets; and (iv) integrating these businesses
into the Company's operations to achieve operating efficiencies and economies
of scale. As part of its acquisition program, the Company has, and in the
future may, as specific opportunities arise, evaluate and pursue acquisitions
in the solid waste collection and disposal industry that do not strictly
conform to the Company's four-step operating program.
 
  The Company's operating strategy emphasizes the integration of its solid
waste collection and disposal operations and the internalization of waste
collected. One of the Company's goals is to maximize the captive waste streams
(which includes waste from the Company's collection operations and third-party
haulers operating under long-term collection contracts) disposed of at each of
its landfills. During the year ended December 31, 1997, the Company's captive
waste constituted an average of approximately 73% of the solid waste disposed
of at Company-owned landfills. In addition, approximately 81% of the total
tonnage collected by the Company during such period was disposed of at Company-
owned landfills. The Company plans to continue to pursue its acquisition-based
growth strategy to maximize the internalization of waste collected and expand
its presence in its existing and proximate markets.
 
                                       3
<PAGE>
 
 
                              RECENT DEVELOPMENTS
 
  Since the Company's offering of Common Stock consummated in October 1997 (the
"October Offering"), the Company has expanded and strengthened its market
presence in its six operating regions through the acquisition of 15 solid waste
businesses, which collectively included one landfill, 15 collection companies,
three transfer stations and a contract to operate a fourth transfer station.
 
  In the New England Region, which the Company entered in September 1996, the
Company continued to expand its presence through five "tuck-in" acquisitions of
collection operations. In the Illinois Region, the Company acquired selected
assets from John Sexton Contractors, Inc. (the "Sexton Acquisition"). The
Sexton Acquisition added a collection operation, two transfer stations and one
landfill to the Company's operations in the Illinois Region. In addition, the
Company has completed two collection company acquisitions in the Illinois
Region, one as a "tuck-in" to the Sexton Acquisition and one as a "tuck-in" to
the Company's existing Chicago operations.
 
  In January 1998, the Company completed the acquisition of the R.C. Miller
companies (the "R.C. Miller Acquisition"), which provide solid waste
collection, transfer and recycling services in Canton, Ohio and surrounding
counties. The R.C. Miller Acquisition further expands the Company's presence in
the Ohio Region and provides a geographical link between the Company's Ohio and
Western Pennsylvania Regions. Subsequent to the R.C. Miller Acquisition, the
Company completed three "tuck-in" acquisitions in the Ohio Region.
 
  In October 1997, the Company repaid its $60 million term loan with a portion
of the proceeds from the October Offering and currently has a $140 million
revolving credit facility (the "Credit Facility"). The Company is currently
negotiating a larger credit facility with its bank group, which the Company
believes would provide it with more flexibility and lower financing costs. At
March 1, 1998, the outstanding debt under the Credit Facility was $34.4
million, up from $19.7 million at December 31, 1997, primarily as a result of
recent acquisitions.
 
  The Company's principal executive offices are located at 745 McClintock
Drive, Suite 230, Burr Ridge, Illinois 60521, and its telephone number is (630)
655-1105.
 
                                  THE OFFERING
 
<TABLE>
<S>                                 <C>
Common Stock Offered by:
  The Company.....................  1,488,629 shares
  The Selling Stockholders........  2,511,371 shares
                                    ---------
    Total.........................  4,000,000 shares
                                    =========
Common Stock outstanding after the
 Offering.........................  22,116,173 shares(1)
Use of proceeds...................  To repay outstanding indebtedness under the
                                    Credit Facility, for possible future
                                    acquisitions and for working capital and
                                    general corporate purposes. The Company
                                    will not receive any of the proceeds from
                                    the sale of shares by the Selling
                                    Stockholders. See "Use of Proceeds."
Nasdaq National Market symbol.....  ADSI
</TABLE>
- --------
(1) Does not include 2,059,358 shares of Common Stock issuable upon the
    exercise of warrants and stock options outstanding as of March 1, 1998, at
    a weighted average exercise price of $19.57 per share.
 
                                       4
<PAGE>
 
                   SUMMARY CONSOLIDATED FINANCIAL INFORMATION
            (DOLLARS IN THOUSANDS, EXCEPT SHARE AND PER SHARE DATA)
 
<TABLE>
<CAPTION>
                                             YEARS ENDED DECEMBER 31,
                                       ----------------------------------------
                                          1995        1996        1997
                                       ----------  ----------  -----------
<S>                                    <C>         <C>         <C>         
STATEMENT OF OPERATIONS DATA:
Revenues.............................  $   30,004  $   56,804  $   121,363
Cost of operations...................      17,286      30,376       65,947
Selling, general and administrative
 expenses............................       5,882       8,328       16,821
Depreciation and amortization
 expense.............................       6,308      12,334       21,975
                                       ----------  ----------  -----------
Operating income.....................         528       5,766       16,620
Interest expense.....................      (3,030)     (5,745)      (6,223)
Interest income......................         189         260          201
Other income.........................         --          179          274
                                       ----------  ----------  -----------
Income (loss) before income taxes and
 extraordinary item..................      (2,313)        460       10,872
Income tax expense...................        (332)       (245)      (3,531)
                                       ----------  ----------  -----------
Income (loss) before extraordinary
 item................................      (2,645)        215        7,341
Extraordinary item--loss on early
 retirement of debt..................        (908)       (476)         --
                                       ----------  ----------  -----------
Net income (loss)....................      (3,553)       (261)       7,341
Preferred stock dividend.............        (190)       (109)         --
                                       ----------  ----------  -----------
Net income (loss) applicable to
 common stockholders.................  $   (3,743) $     (370) $     7,341
                                       ==========  ==========  ===========
Basic earnings per common share:(1)
 Income (loss) before extraordinary
  item...............................  $    (0.85) $     0.02  $      0.56
 Extraordinary item..................       (0.27)      (0.07)         --
                                       ----------  ----------  -----------
 Net income (loss)...................  $    (1.12) $    (0.05) $      0.56
                                       ==========  ==========  ===========
Weighted average common stock
 outstanding.........................   3,340,512   7,063,928   13,177,346
                                       ==========  ==========  ===========
Diluted earnings per common share:
 Income (loss) before extraordinary
  item...............................  $    (0.85) $     0.01  $      0.53
 Extraordinary item..................       (0.27)      (0.06)         --
                                       ----------  ----------  -----------
 Net income (loss)...................  $    (1.12) $    (0.05) $      0.53
                                       ==========  ==========  ===========
Weighted average common stock and
 common stock equivalent shares
 outstanding.........................   3,340,512   7,465,050   13,822,337
                                       ==========  ==========  ===========
OTHER DATA:
Net cash provided by operating
 activities..........................  $    5,601  $   10,336  $    31,126
Net cash used in investing
 activities..........................     (68,374)    (37,663)    (177,368)
Net cash provided by financing
 activities..........................      68,608      23,245      146,367
EBITDA(2)............................       6,836      18,100       38,595
EBITDA margin(3).....................        22.8%       31.9%        31.8%
</TABLE>
 
<TABLE>
<CAPTION>
                                                            DECEMBER 31, 1997
                                                          ---------------------
                                                          ACTUAL  AS ADJUSTED(4)
                                                          ------- -------------
<S>                                                       <C>     <C>
BALANCE SHEET DATA:
Cash and cash equivalents................................ $ 2,426    $19,574
Working capital..........................................     721     17,869
Property and equipment, net.............................. 174,340    174,340
Total assets............................................. 373,024    404,918
Long-term obligations, net of current portion............  20,788      1,122
Total stockholders' equity............................... 297,375    348,935
</TABLE>
- --------
(1) The Company adopted Statement of Financial Accounting Standards (SFAS) No.
    128, Earnings per Share, during the fourth quarter of 1997. SFAS No. 128
    replaced the calculation of primary and fully diluted earnings per common
    share with basic and diluted earnings per common share. Earnings (loss) per
    common share amounts have been restated, where appropriate.
(2) EBITDA represents operating income plus depreciation and amortization.
    While EBITDA data should not be construed as a substitute for operating
    income, net income (loss) or cash flows from operations in analyzing the
    Company's operating performance, financial position and cash flows, the
    Company has included EBITDA data (which are not a measure of financial
    performance under generally accepted accounting principles) because it
    understands that such data are commonly used by certain investors to
    evaluate a company's performance in the solid waste industry. EBITDA, as
    measured by the Company, might not be comparable to similarly titled
    measures reported by other companies. Funds depicted by the EBITDA measure
    are not available for management's discretionary use due to required debt
    service and other commitments or uncertainties.
(3) EBITDA margin represents EBITDA expressed as a percentage of revenues.
(4) As adjusted to give effect to the sale of shares of Common Stock offered
    hereby (the "Offering") and the application of the estimated net proceeds
    therefrom, as described in "Use of Proceeds," as if the Offering had
    occurred on December 31, 1997. Long-term obligations, net of current
    portion, of $20,788 was adjusted to give effect to borrowings of $14.7
    million to fund acquisitions completed in the period from January 1, 1998
    to February 28, 1998 and the application of the estimated net proceeds of
    $51.6 million from this Offering to arrive at the As Adjusted balance of
    $1.1 million.
 
                                       5
<PAGE>
 
                                 RISK FACTORS
 
  An investment in the shares of Common Stock being offered by this Prospectus
involves a high degree of risk. In addition, this Prospectus contains certain
statements of a forward-looking nature relating to future events or the future
financial performance of the Company within the meaning of Section 27A of the
Securities Act of 1933, as amended, and Section 21E of the Securities Exchange
Act of 1934, as amended, and are intended to be covered by the safe harbors
created thereby. Discussions containing such forward-looking statements may be
found in the material set forth under "Prospectus Summary," "Risk Factors,"
and "Management's Discussion and Analysis of Financial Condition and Results
of Operations" as well as in the Prospectus generally. The Company's actual
results could differ materially from those anticipated in these forward-
looking statements as a result of certain factors, including those set forth
in the following risk factors and elsewhere in this Prospectus. Accordingly,
prospective investors should consider carefully the following risk factors, in
addition to the other information concerning the Company and its business
contained in this Prospectus, before purchasing the shares of Common Stock
offered hereby.
 
AVAILABILITY OF ADDITIONAL ACQUISITION TARGETS
 
  The Company's ongoing acquisition program is a key element of its
acquisition-based growth strategy for expanding its solid waste management
services. Consequently, the future growth of the Company depends in large part
upon the successful continuation of this acquisition program. The Company may
encounter substantial competition in its efforts to acquire landfills,
transfer stations and collection companies. There can be no assurance that the
Company will succeed in locating or acquiring appropriate acquisition
candidates at price levels and on terms and conditions that the Company
considers appropriate.
 
INTEGRATION OF ACQUISITIONS
 
  The financial position and results of operations of the Company will depend
to a large extent on the Company's ability to integrate effectively the
operations of the companies it has acquired to date, and expects to acquire in
the future, and to realize expected efficiencies and economies of scale from
such acquisitions. There can be no assurance that the Company's efforts to
integrate these operations will be effective, that expected efficiencies and
economies of scale will be realized or that the Company will be able to
successfully consolidate its operations. The failure to achieve any of these
results could have a material adverse effect on the Company's business,
financial condition and results of operations.
 
ABILITY TO MANAGE GROWTH
 
  The Company's goal is to increase the scale of its operations significantly
through the acquisition of other solid waste businesses and through internal
growth. Consequently, the Company may experience periods of rapid growth with
significantly increased staffing level requirements. Such growth could place a
significant strain on the Company's management and on its operational,
financial and other resources. The Company's ability to maintain and manage
its growth effectively will require it to expand its management information
systems capabilities and improve its operational and financial systems and
controls. Moreover, the Company will need to attract, train, motivate, retain
and manage its senior managers, technical professionals and other employees.
Any failure to expand its management information system capabilities, to
implement and improve its operational and financial systems and controls or to
recruit appropriate additional personnel in an efficient manner at a pace
consistent with the Company's business growth could have a material adverse
effect on the Company's business, financial condition and results of
operations.
 
HIGHLY COMPETITIVE INDUSTRY
 
  The solid waste collection and disposal business is highly competitive and
requires substantial amounts of capital. The Company competes with numerous
solid waste management companies, many of which are significantly larger and
have greater financial resources than the Company. The Company also competes
with those counties, municipalities and solid waste districts that maintain
their own waste collection and disposal
 
                                       6
<PAGE>
 
operations. These counties, municipalities and solid waste districts may have
financial advantages due to the availability to them of user fees, charges or
tax revenues and the greater availability to them of tax-exempt financing. In
addition, competitors may reduce the price of their services in an effort to
expand market share or to win competitively bid municipal contracts. There can
be no assurance that the Company will be able to compete successfully.
 
FUNDING OF FUTURE CAPITAL REQUIREMENTS; PRIOR LOSSES AND WORKING CAPITAL
DEFICITS
 
  The Company's acquisition-based growth strategy has resulted in a steady
increase in its capital requirements, and such increase may continue in the
future as the Company pursues its strategy. The Company recorded net losses to
common stockholders of approximately $3.7 million and $370,000 during the
fiscal years ended December 31, 1995 and 1996, respectively. In addition, the
Company has incurred working capital deficits in the past, and there can be no
assurance that its available working capital will be sufficient in the future
as it pursues its growth strategy. Furthermore, in connection with a completed
acquisition, the Company may be obligated to make contingent cash payments of
up to approximately $37.5 million over the next nine years if certain business
development projects are achieved as a result of that acquisition. To the
extent that internally generated cash and cash available under the Credit
Facility are not sufficient to provide the cash required for future
operations, capital expenditures, acquisitions, earn-out and contingent
payments, debt repayment obligations and financial assurance obligations, the
Company will require additional equity or debt financing in order to provide
such cash. There can be no assurance, however, that such financing will be
available or, if available, will be on terms satisfactory to the Company.
Where appropriate, the Company may seek to minimize the use of cash to finance
its acquisitions by using capital stock, assumption of indebtedness or notes.
However, there can be no assurance the owners of the businesses the Company
may wish to acquire will be willing to accept non-cash consideration in whole
or in part.
 
USE OF LEVERAGE
 
  Historically, the Company has incurred significant debt obligations in
connection with financing its acquisitions and business growth. The Company
has a $140 million Credit Facility with a bank group led by ING (U.S.) Capital
Corporation, as administrative agent, Morgan Guaranty Trust Company of New
York, as syndication agent, Union Bank of California, N.A., as documentation
agent, BHF-Bank Aktiengesellschaft, as co-agent, and Bank of America Illinois,
as co-agent. As of December 31, 1997, the Company's consolidated indebtedness
was $23.1 million, its consolidated total assets were $373.0 million and its
stockholders' equity was $297.4 million. At March 1, 1998, the Company's
consolidated indebtedness had increased to approximately $39.7 million.
Following the completion of the Offering and the application of the net
proceeds to the Company for the repayment of the Credit Facility, it is
anticipated that the Company's consolidated indebtedness would be
approximately $3.4 million. The Company anticipates incurring significant
indebtedness in the future in order to fund all or a portion of the purchase
price of future acquisitions. The Company's ability to meet its debt service
obligations will depend upon its future performance, which, in turn, will be
subject to general economic conditions and to financial, business and other
factors affecting the operations of the Company, many of which are beyond the
Company's control. If the Company fails to generate sufficient cash flow to
repay its debt, the Company may be required to refinance all or a portion of
its existing debt or to obtain additional financing. There can be no assurance
that such refinancing or any additional financing could be obtained on terms
favorable to the Company or at all.
 
POTENTIAL LIABILITIES ASSOCIATED WITH ACQUISITIONS
 
  The businesses acquired by the Company may have liabilities that the Company
did not discover or may have been unable to discover during its pre-
acquisition investigations, including liabilities arising from environmental
contamination or non-compliance by prior owners with environmental laws or
regulatory requirements, and for which the Company, as a successor owner or
operator, may be responsible. Any indemnities or warranties, due to their
limited scope, amount, or duration, the financial limitations of the
indemnitor or warrantor or other reasons, may not fully cover such
liabilities.
 
 
                                       7
<PAGE>
 
DEPENDENCE ON SENIOR MANAGEMENT
 
  The Company is highly dependent on its senior management team. The loss of
the services of any member of senior management may have a material adverse
effect on the Company's business, financial condition and results of
operations. In an effort to minimize this risk, the Company has entered into
employment contracts with certain members of senior management. The Company
does not maintain "key man" life insurance with respect to members of senior
management except for a $2.0 million policy maintained on the Company's
President and Chief Executive Officer.
 
LIMITATIONS ON INTERNAL EXPANSION
 
  The Company's operating program depends on its ability to expand and develop
its landfills, transfer stations and collection operations. The process of
obtaining required permits and approvals to operate or expand solid waste
management facilities, including landfills and transfer stations, has become
increasingly difficult and expensive, often taking several years, requiring
numerous hearings and compliance with zoning, environmental and other
regulatory requirements, and often being subject to resistance from citizen or
other groups. There can be no assurance that the Company will be successful in
obtaining the permits it requires or that such permits will not contain
onerous terms and conditions. An inability to receive such permits and
approvals could have a material adverse effect on the Company's business,
financial condition and results of operations. See "--Extensive Environmental
and Land Use Laws and Regulations." In some areas, suitable land may be
unavailable for new landfill sites. There can be no assurance that the Company
will be successful in obtaining new landfill sites or expanding the permitted
capacity of its current landfills once its landfill capacity has been
consumed. In such event, the Company could be forced to dispose of collected
waste at landfills operated by its competitors, which could have a material
adverse effect on the Company's landfill revenues and collection expenses.
 
DEPENDENCE ON THIRD PARTY COLLECTION OPERATIONS
 
  A portion of the solid waste delivered to the Company's landfills is
delivered by third party collection companies under informal arrangements or
without long-term contracts. If these third parties discontinued their
arrangements with the Company and if the Company were unable to replace these
third party arrangements, the Company's business, financial condition and
results of operations might be materially adversely affected.
 
EXTENSIVE ENVIRONMENTAL AND LAND USE LAWS AND REGULATIONS
 
  The Company is subject to extensive and evolving environmental and land use
laws and regulations, which have become increasingly stringent in recent years
as a result of greater public interest in protecting and cleaning up the
environment. These laws and regulations affect the Company's business in many
ways, including as set forth below.
 
  Extensive Permitting Requirements. In order to develop and operate a
landfill or other solid waste management facility, it is necessary to obtain
and maintain in effect one or more facility permits and other governmental
approvals, including those related to zoning, environmental and land use. In
addition, the Company may be required to obtain similar permits and approvals
in order to expand its existing landfill and solid waste management
operations. These permits and approvals are difficult and time consuming to
obtain and are frequently subject to community opposition, opposition by
various local elected officials or citizens and other uncertainties. In
addition, after an operating permit for a landfill or other facility is
obtained, the permit may be subject to modification or revocation by the
issuing agency, and it may be necessary to obtain periodically a renewal of
the permit, which may reopen opportunities for opposition to the permit.
Moreover, from time to time, regulatory agencies may delay the review or grant
of these required permits or approvals or may modify the procedures or
increase the stringency of the standards applicable to its review or grant of
such permits or approvals. In addition, the Company may not be able to ensure
that its landfill operations are included and remain in the solid waste
management plan of the state or county in which such operations are conducted.
The Company may also have difficulty obtaining host agreements with counties
or local communities, or existing host communities may demand modifications of
existing host agreements in connection with planned expansions,
 
                                       8
<PAGE>
 
either of which could adversely affect the Company's operations and increase
the Company's costs and reduce its margins. There can be no assurance that the
Company will be successful in obtaining and maintaining in effect the permits
and approvals required for the successful operation and growth of its
business, including permits or approvals required for planned landfill
expansions, and the failure by the Company to obtain or maintain in effect a
permit significant to its business could materially adversely affect the
Company's business, financial condition and results of operations.
 
  Design, Operation and Closure Requirements. The design, operation and
closure of landfills are subject to extensive regulations. These regulations
include, among others, the regulations (the "Subtitle D Regulations")
establishing minimum federal requirements adopted by the United States
Environmental Protection Agency (the "EPA") in October 1991 under Subtitle D
of the Resource Conservation and Recovery Act of 1976 ("RCRA"). The Subtitle D
Regulations generally became effective on October 9, 1993 (except for more
stringent financial assurance requirements, which became effective April 9,
1997). The Subtitle D Regulations require all states to adopt regulations
regarding landfill design, operation and closure requirements that are as
stringent as, or more stringent than, the Subtitle D Regulations. All states
in which the Company's landfills are located have in place extensive landfill
regulations consistent with the Subtitle D requirements. These federal and
state regulations require the Company to design the landfill in accordance
with stringent technical requirements, monitor groundwater, post financial
assurances, and fulfill landfill closure and post-closure obligations. These
regulations could also require the Company to undertake investigatory,
remedial and monitoring activities, to curtail operations or to close a
landfill temporarily or permanently. Furthermore, future changes in these
regulations may require the Company to modify, supplement, or replace
equipment or facilities at costs which may be substantial.
 
  Legal and Administrative Proceedings. In the ordinary course of its
business, the Company may become involved in a variety of legal and
administrative proceedings relating to land use and environmental laws and
regulations. These may include proceedings by federal, state or local agencies
seeking to impose flow control requirements, civil or criminal penalties on
the Company for violations of such laws and regulations, or to impose
liability on the Company under the Comprehensive Environmental Response,
Compensation, and Liability Act of 1980 ("CERCLA") or comparable state
statutes, or to revoke or deny renewal of a permit; actions brought by
citizens' groups, adjacent landowners or governmental entities opposing the
issuance of a permit or approval to the Company or alleging violations of the
permits pursuant to which the Company operates or laws or regulations to which
the Company is subject; and actions seeking to impose liability on the Company
for any environmental damage at its landfill sites or that its landfills or
other properties may have caused to adjacent landowners or others, or at sites
to which it transported waste, including groundwater or soil contamination.
The Company could incur substantial legal expenses during the course of the
aforementioned proceedings, and the adverse outcome of one or more of these
proceedings could materially adversely affect the Company's business,
financial condition and results of operations.
 
  During the ordinary course of its operations, the Company has from time to
time received, and expects that it may in the future receive, citations or
notices from governmental authorities that its operations are not in
compliance with its permits or certain applicable environmental or land use
laws and regulations. The Company generally seeks to work with the authorities
to resolve the issues raised by such citations or notices. There can be no
assurance, however, that the Company will always be successful in this regard,
and the failure to resolve a significant issue could result in one or more of
the adverse consequences to the Company described below under "Potential
Liabilities."
 
  Potential Liabilities. There may be various adverse consequences to the
Company in the event that a facility owned or operated by the Company (or a
predecessor owner or operator whose liabilities the Company may have acquired
expressly or under successor liability theories) causes environmental damage,
in the event that waste transported by the Company (or a predecessor) causes
environmental damage at another site, in the event that the Company fails (or
a predecessor failed) to comply with applicable environmental and land use
laws and regulations or the terms of a permit or outstanding consent order or
in the event the Company's owned or operated facility or the soil or
groundwater thereunder is or becomes contaminated. These may include the
imposition of substantial monetary penalties on the Company; the issuance of
an order requiring the curtailment
 
                                       9
<PAGE>
 
or termination of the operations involved or affected; the revocation or
denial of permits or other approvals necessary for continued operation or
landfill expansion; the imposition of liability on the Company in respect of
any environmental damage (including groundwater or soil contamination) at its
landfill sites or that its landfills or other facilities or other Company-
owned or operated facilities caused to adjacent landowners or others or
environmental damage at another site associated with waste transported by the
Company; the imposition of liability on the Company under CERCLA or under
comparable state laws; and criminal liability for the Company or its officers.
Any of the foregoing could materially adversely affect the Company's business,
financial condition and results of operations.
 
  CERCLA and analogous state laws impose retroactive strict joint and several
liability on various parties that are, or have been, associated with a site
from which there has been, or is threatened, a release of any hazardous
substance (as defined by CERCLA) into the environment. Liability under RCRA,
CERCLA and analogous state laws may include responsibility for costs of site
investigations, site cleanup, site monitoring, natural resources damages and
property damages. Liabilities under RCRA, CERCLA and analogous state laws can
be very substantial and, if imposed upon the Company, could materially
adversely affect the Company's business, financial condition and results of
operations.
 
  In the ordinary course of its landfill and waste management operations and
in connection with its review of landfill and other operations to be acquired,
the Company has discovered at one landfill, and may in the future discover at
other landfills or waste management facilities, indications of groundwater
contamination. In such events, the Company would seek or be required to
determine the magnitude and source of the problem and, if appropriate or
required by applicable regulations, to design and implement measures to
remedy, or halt the spread of, the contamination. There can be no assurance,
however, that contamination discovered at a landfill or at other Company sites
will not result in one or more of the adverse consequences to the Company
described above.
 
  Type, Quantity and Source Limitations. Certain permits and approvals may
limit the types of waste that may be accepted at a landfill or the quantity of
waste that may be accepted at a landfill during a given time period. In
addition, certain permits and approvals, as well as certain state and local
regulations, may limit a landfill to accepting waste that originates from
specified geographic areas or seek to restrict the importation of out-of-state
waste or otherwise discriminate against out-of-state waste. Generally,
restrictions on the importation of out-of-state waste have not withstood
judicial challenge. However, from time to time federal legislation is proposed
which would allow individual states to prohibit the disposal of out-of-state
waste or to limit the amount of out-of-state waste that could be imported for
disposal and would require states, under certain circumstances, to reduce the
amounts of waste exported to other states. Although such legislation has not
yet been adopted by Congress, if this or similar legislation is enacted,
states in which the Company operates landfills could act to limit or prohibit
the importation of out-of-state waste. Such state actions could materially
adversely affect landfills within those states that receive a significant
portion of waste originating from out-of-state.
 
  In addition, certain states and localities may for economic or other reasons
restrict the exportation of waste from their jurisdiction or require that a
specified amount of waste be disposed of at facilities within their
jurisdiction. In 1994, the United States Supreme Court held unconstitutional,
and therefore invalid, a local ordinance that sought to impose flow controls
on taking waste out of the locality. However, certain state and local
jurisdictions continue to seek to enforce such restrictions and, in certain
cases, the Company may elect not to challenge such restrictions based upon
various considerations. In addition, the aforementioned proposed federal
legislation, if adopted, could allow states and localities to impose certain
flow control restrictions. These restrictions could result in the volume of
waste going to landfills being reduced in certain areas, which may materially
adversely affect the Company's ability to operate its landfills at their full
capacity and/or affect the prices that can be charged for landfill disposal
services. These restrictions may also result in higher disposal costs for the
Company's collection operations. If the Company were unable to pass such
higher costs through to its customers, the Company's business, financial
condition and results of operations could be materially adversely affected.
 
 
                                      10
<PAGE>
 
LIMITS ON INSURANCE COVERAGE
 
  There can be no assurance that the Company's pollution liability insurance
will provide sufficient coverage in the event an environmental claim were made
against the Company or that the Company will be able to maintain in place such
insurance at reasonable costs. An uninsured or underinsured claim of
sufficient magnitude could have a material adverse effect on the Company's
business, financial condition and results of operations.
 
INCURRENCE OF CHARGES RELATED TO CAPITALIZED EXPENDITURES
 
  In accordance with generally accepted accounting principles, the Company
capitalizes certain expenditures and advances relating to acquisitions,
pending acquisitions and landfill development and expansion projects. Indirect
acquisition costs, such as executive salaries, general corporate overhead,
public affairs and other corporate services, are expensed as incurred. The
Company's policy is to charge against earnings any unamortized capitalized
expenditures and advances (net of any portion thereof that the Company
estimates will be recoverable, through sale or otherwise) relating to any
operation that is permanently shut down, any pending acquisition that is not
consummated, and any landfill development or expansion project that is not or
not expected to be successfully completed. Therefore, the Company may be
required to incur a charge against earnings in future periods, which charge,
depending upon the magnitude thereof, could materially adversely affect the
Company's business, financial condition and results of operations.
 
USE OF ALTERNATIVES TO LANDFILL DISPOSAL
 
  Alternatives to landfill disposal, such as recycling and composting, are
increasingly being used. In addition, incineration is an alternative to
landfill disposal in certain of the Company's markets. There also has been an
increasing trend at the state and local levels to mandate recycling and waste
reduction at the source and to prohibit the disposal of certain type of
wastes, such as yard wastes, at landfills. These developments may result in
the volume of waste going to landfills being reduced in certain areas, which
may affect the Company's ability to operate its landfills at their full
capacity or affect the prices that can be charged for landfill disposal
services. For example, Illinois, Ohio and Pennsylvania, states in which the
Company operates landfills, have adopted bans on the disposal of yard waste or
leaves in landfills located in those states, and all of the states in which
the Company operates landfills have adopted rules restricting or limiting
disposal of tires at landfills. In addition, each of the states in which the
Company operates landfills has adopted plans or requirements which set goals
for specified percentages of certain solid waste items to be recycled. These
recycling goals are being phased in over the next few years. These
alternatives, if and when adopted and implemented, may have a material adverse
effect on the business, financial condition and results of operations of the
Company.
 
ABILITY TO MEET FINANCIAL ASSURANCE OBLIGATIONS
 
  The Company is required to post a performance bond or a bank letter of
credit or to provide other forms of financial assurance in connection with
closure and post-closure obligations with respect to landfills or its other
solid waste management operations and may be required to provide such
financial assurance in connection with municipal residential collection
contracts. If the Company were unable to obtain surety bonds in sufficient
amounts, or to provide other required forms of financial assurance, it would
be unable to remain in compliance with the Subtitle D Regulations or
comparable state requirements and, among other things, might be precluded from
entering into certain municipal collection contracts and obtaining or holding
landfill operating permits.
 
SEASONALITY
 
  The Company's revenues tend to be somewhat lower in the winter months. This
is primarily attributable to the fact that: (i) the volume of waste relating
to construction and demolition activities tends to increase in the spring and
summer months; and (ii) the volume of industrial and residential waste in the
regions where the Company operates tends to decrease during the winter months.
In addition, particularly harsh weather conditions may delay the development
of landfill capacity and otherwise result in the temporary suspension of
certain of
 
                                      11
<PAGE>
 
the Company's operations and could materially adversely affect the Company's
overall business, financial condition and results of operations.
 
ANTI-TAKEOVER PROVISIONS
 
  The Board of Directors may issue up to 5,000,000 shares of Preferred Stock
in the future without stockholder approval upon such terms as the Board of
Directors may determine. The rights of the holders of Common Stock will be
subject to, and may be adversely affected by, the rights of the holders of any
Preferred Stock that may be issued in the future. The issuance of Preferred
Stock, while providing flexibility in connection with possible acquisitions
and other corporate purposes, could have the effect of delaying or preventing
a change in control of the Company without further action by the stockholders.
The Company has no present plans to issue any shares of Preferred Stock. In
addition, the Company is subject to the anti-takeover provisions of Section
203 of the Delaware General Corporation Law, which prohibits the Company from
engaging in a "business combination" with an "interested stockholder" for a
period of three years after the date of the transaction in which the person
became an interested stockholder, unless the business combination is approved
in a prescribed manner. The application of Section 203 also could have the
effect of delaying or preventing a change of control of the Company.
 
ABSENCE OF DIVIDENDS
 
  The Company has never declared or paid dividends on its Common Stock and
does not anticipate paying dividends in the foreseeable future.
 
                                      12
<PAGE>
 
                                USE OF PROCEEDS
 
  The net proceeds to the Company from the sale of the 1,488,629 shares of
Common Stock offered by the Company hereby are estimated to be $   million ($
   million if the Underwriters' over-allotment option is exercised in full).
The Company intends to apply a portion of the net proceeds of the Offering to
repay amounts outstanding under the Credit Facility. The net proceeds of the
Offering that have not been applied to repay amounts outstanding under the
Credit Facility will be available for possible future acquisitions and for
working capital and general corporate purposes. The Credit Facility provides
for a revolving line of credit of $140 million to be used for acquisitions (of
which $20 million may be used for working capital and letter of credit
purposes). The Credit Facility bears interest at rates per annum equal to, at
the Company's discretion, either (i) the higher of (a) the federal funds rate
plus 0.5% and (b) the prime rate, plus an applicable margin or (ii) the London
Interbank Offered Rate ("LIBOR") plus an applicable margin, and matures in
2002. As of March 1, 1998, the Company had borrowed $34.4 million under the
Credit Facility. As of such date, the interest rates on the various loans
under the Credit Facility ranged from 6.63% to 8.50%. The Company intends to
draw down on the Credit Facility from time to time in order to fund future
acquisitions in whole or in part. See "Management's Discussion and Analysis of
Financial Condition and Results of Operations--Liquidity and Capital
Resources." The net proceeds from the sale of the 2,511,371 shares of Common
Stock offered hereby by the Selling Stockholders, will be paid directly to the
Selling Stockholders. The Company will not receive any proceeds from such
sale. See "Principal and Selling Stockholders."
 
                          PRICE RANGE OF COMMON STOCK
 
  The Common Stock of the Company has been quoted on the Nasdaq National
Market under the symbol ("ADSI") since July 26, 1996, the date of the
commencement of the Company's initial public offering. The following table
sets forth, for the periods indicated, the high and low closing prices of the
Common Stock as reported on the Nasdaq National Market:
 
<TABLE>
<CAPTION>
                                                                   HIGH   LOW
                                                                  ------ ------
<S>                                                               <C>    <C>
1996
3rd Quarter...................................................... $18.25 $ 9.00
4th Quarter...................................................... $18.50 $15.50
1997
1st Quarter...................................................... $18.00 $16.50
2nd Quarter...................................................... $25.06 $16.38
3rd Quarter...................................................... $33.75 $21.00
4th Quarter...................................................... $37.50 $29.00
1998
1st Quarter (through March 11, 1998)............................. $38.03 $32.25
</TABLE>
 
  On March 11, 1998 the last reported sales price of the Common Stock was
$36.8125 per share.
 
                                DIVIDEND POLICY
 
  The Company has never declared or paid any dividends on its Common Stock.
The Company and its Board of Directors currently intend to retain any earnings
for use in the operation and expansion of the Company's business and do not
anticipate paying any dividends on the Common Stock for the foreseeable
future. The Credit Facility prohibits the payment of cash dividends without
prior bank approval. See "Management's Discussion and Analysis of Financial
Condition and Results of Operations--Liquidity and Capital Resources."
 
                                      13
<PAGE>
 
                                CAPITALIZATION
 
  The following table sets forth: (i) the current portion of long-term
obligations and the actual capitalization of the Company at December 31, 1997
and (ii) "As Adjusted" amounts to reflect (a) additional borrowings under the
Credit Facility of $14.7 million in conjunction with acquisitions completed in
the period between January 1, 1998 and February 28, 1998 and (b) the sale of
1,488,629 shares of Common Stock offered by the Company hereby and the
application of the estimated net proceeds of the Offering to repay amounts
outstanding under the Credit Facility and to fund costs of the Offering. See
"Use of Proceeds."
 
<TABLE>
<CAPTION>
                                                         DECEMBER 31, 1997
                                                      -------------------------
                                                                       AS
                                                        ACTUAL      ADJUSTED
                                                      -----------  ------------
                                                      (DOLLARS IN THOUSANDS,
                                                        EXCEPT SHARE DATA)
<S>                                                   <C>          <C>
Current portion of long-term debt and capital lease
 obligations......................................... $     2,360  $     2,360
                                                      ===========  ===========
Long-term debt and capital lease obligations, net of
 current portion..................................... $    20,788  $     1,122
Stockholders' equity: (1)
  Preferred stock; 5,000,000 shares authorized; no
   shares issued or outstanding......................         --           --
  Common stock; 60,000,000 shares authorized;
   19,323,100 shares issued and outstanding;
   22,116,173 shares issued and outstanding as
   adjusted..........................................         193          211
  Additional paid-in capital.........................     298,110      349,652
  Accumulated deficit................................        (928)        (928)
                                                      -----------  -----------
    Total stockholders' equity.......................     297,375      348,935
                                                      -----------  -----------
    Total capitalization............................. $   318,163  $   350,057
                                                      ===========  ===========
</TABLE>
- --------
(1) Excludes (i) 600,000 additional shares of Common Stock that may be sold
    pursuant to the Underwriters' over-allotment option, and (ii) 1,450,145
    shares of Common Stock reserved for issuance pursuant to stock options and
    outstanding warrants.
 
                                      14
<PAGE>
 
                     SELECTED CONSOLIDATED FINANCIAL DATA
 
  The following table presents selected consolidated statement of operations,
balance sheet, and other data of the Company for the periods presented. See
the Notes to Consolidated Financial Statements included elsewhere herein for
information concerning the basis of presentation. The following selected
consolidated financial data as of December 31, 1996 and 1997 and for each of
the three years ended December 31, 1997 have been derived from the audited
consolidated financial statements of the Company included elsewhere in this
Prospectus and should be read in conjunction with "Management's Discussion and
Analysis of Financial Condition and Results of Operations." The selected
consolidated financial data as of December 31, 1995 is derived from audited
consolidated financial statements that are incorporated by reference.
 
<TABLE>
<CAPTION>
                                               YEARS ENDED DECEMBER 31,
                                          -------------------------------------
                                            1995       1996        1997
                                          ---------  ---------  ----------
                                          (DOLLARS IN THOUSANDS, EXCEPT
                                            SHARE AND PER SHARE DATA)
<S>                                       <C>        <C>        <C>
STATEMENT OF OPERATIONS DATA:
Revenues................................  $  30,004  $  56,804  $  121,363
Cost of operations......................     17,286     30,376      65,947
Selling, general and administrative
 expenses...............................      5,882      8,328      16,821
Depreciation and amortization expense...      6,308     12,334      21,975
                                          ---------  ---------  ----------
Operating income........................        528      5,766      16,620
Interest expense........................     (3,030)    (5,745)     (6,223)
Interest income.........................        189        260         201
Other income............................        --         179         274
                                          ---------  ---------  ----------
Income (loss) before income taxes and
 extraordinary item.....................     (2,313)       460      10,872
Income tax expense......................       (332)      (245)     (3,531)
                                          ---------  ---------  ----------
Income (loss) before extraordinary
 item...................................     (2,645)       215       7,341
Extraordinary item--loss on early
 retirement of debt.....................       (908)      (476)        --
                                          ---------  ---------  ----------
Net income (loss).......................     (3,553)      (261)      7,341
Preferred stock dividend................       (190)      (109)        --
                                          ---------  ---------  ----------
Net income (loss) applicable to common
 stockholders...........................  $  (3,743) $    (370) $    7,341
                                          =========  =========  ==========
Basic earnings per common share:(1)
 Income (loss) before extraordinary
  item..................................  $   (0.85) $    0.02  $     0.56
 Extraordinary item.....................      (0.27)     (0.07)        --
                                          ---------  ---------  ----------
 Net income (loss)......................  $   (1.12) $   (0.05) $     0.56
                                          =========  =========  ==========
Weighted average common stock
 outstanding............................  3,340,512  7,063,928  13,177,346
                                          =========  =========  ==========
Diluted earnings per common share:
 Income (loss) before extraordinary
  item..................................  $   (0.85) $    0.01  $     0.53
 Extraordinary item.....................      (0.27)     (0.06)        --
                                          ---------  ---------  ----------
 Net income (loss)......................  $   (1.12) $   (0.05) $     0.53
                                          =========  =========  ==========
Weighted average common stock and common
 stock equivalent shares outstanding....  3,340,512  7,465,050  13,822,337
                                          =========  =========  ==========
OTHER DATA:
Net cash provided by operating
 activities.............................  $   5,601  $  10,336  $   31,126
Net cash used in investing activities...    (68,374)   (37,663)   (177,368)
Net cash provided by financing
 activities.............................     68,608     23,245     146,367
EBITDA(2)...............................      6,836     18,100      38,595
EBITDA margin(3)........................       22.8%      31.9%       31.8%
</TABLE>
 
<TABLE>
<CAPTION>
                                        DECEMBER 31,      DECEMBER 31, 1997
                                       ---------------- ----------------------
                                        1995     1996   ACTUAL  AS ADJUSTED(4)
                                       -------  ------- ------- --------------
<S>                                    <C>      <C>     <C>     <C>
BALANCE SHEET DATA:
Cash and cash equivalents............. $ 6,383  $ 2,301 $ 2,426    $19,574
Working capital.......................  (8,819)   1,219     721     17,869
Property and equipment, net...........  81,250   93,692 174,340    174,340
Total assets.......................... 114,693  144,986 373,024    404,918
Long-term obligations, net of current
 portion..............................  48,789   65,445  20,788      1,122
Total stockholders' equity............  33,855   58,097 297,375    348,935
</TABLE>
 
                                      15
<PAGE>
 
- --------
(1) The Company adopted Statement of Financial Accounting Standards (SFAS) No.
    128, Earnings per Share, during the fourth quarter of 1997. SFAS No. 128
    replaced the calculation of primary and fully diluted earnings per common
    share with basic and diluted earnings per common share. Earnings (loss)
    per common share amounts have been restated, where appropriate.
(2) EBITDA represents operating income plus depreciation and amortization.
    While EBITDA data should not be construed as a substitute for operating
    income, net income (loss) or cash flows from operations in analyzing the
    Company's operating performance, financial position and cash flows, the
    Company has included EBITDA data (which are not a measure of financial
    performance under generally accepted accounting principles) because it
    understands that such data are commonly used by certain investors to
    evaluate a company's performance in the solid waste industry. EBITDA, as
    measured by the Company, might not be comparable to similarly titled
    measures reported by other companies. Funds depicted by the EBITDA measure
    are not available for management's discretionary use due to required debt
    service and other commitments or uncertainties.
(3) EBITDA margin represents EBITDA expressed as a percentage of revenues.
(4) As adjusted to give effect to the sale of shares of Common Stock offered
    in the Offering and the application of the estimated net proceeds
    therefrom, as described in "Use of Proceeds," as if the Offering had
    occurred on December 31, 1997. Long-term obligations, net of current
    portion, of $20,788 was adjusted to give effect to borrowings of $14.7
    million to fund acquisitions completed in the period from December 31,
    1997 to February 28, 1998 and the application of the estimated net
    proceeds of $51.6 million from this Offering to arrive at the As Adjusted
    balance of $1.1 million.
 
                                      16
<PAGE>
 
                     MANAGEMENT'S DISCUSSION AND ANALYSIS
               OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS
 
  The following discussion should be read in conjunction with the "Selected
Consolidated Financial Data," the Company's Consolidated Financial Statements
and the notes thereto.
 
GENERAL
 
  Revenues. The Company's revenues are attributable primarily to fees charged
to customers for waste collection, transfer and disposal services. The
Company's collection services are generally provided under direct agreements
with its customers or pursuant to contracts with municipalities. Commercial
and municipal contract terms, where used, generally range from one to five
years and commonly have automatic renewal options. A relatively small portion
of such agreements also provide for the prepayment of certain fees, which fees
are reflected as deferred revenues.
 
  The table below shows, for the periods indicated, the percentage of the
Company's total revenues attributable to services provided. The Company's
revenue derived from landfill operations increased substantially with the
acquisition of the Clarion, Wyandot and Livingston landfills in separate
closings in June, August, and November 1995 (collectively, the "CDI
Acquisition"). Since the CDI Acquisition, the Company has acquired
proportionately more collection operations than landfill operations, resulting
in a decreasing overall percentage of revenues attributable to landfill
operations.
 
<TABLE>
<CAPTION>
                                                    YEARS ENDED DECEMBER 31,
                                                   ----------------------------
                                                     1995      1996      1997
                                                   --------  --------  --------
<S>                                                <C>       <C>       <C>
Collection(1).....................................     55.3%     47.5%     55.6%
Transfer..........................................      5.0       2.1       5.8
Landfill(1).......................................     39.0      49.9      37.9
Other.............................................      0.7       0.5       0.7
                                                   --------  --------  --------
  Total Revenues..................................    100.0%    100.0%    100.0%
                                                   ========  ========  ========
</TABLE>
- --------
(1) The portion of collection revenues attributable to disposal charges for
    waste collected by the Company and disposed of at the Company's landfills
    has been excluded from collection revenues and included in landfill
    revenues.
 
  A component of the Company's business strategy is to maximize
internalization of waste it collects and thereby realize higher margins from
its operations. By disposing of waste at Company-owned landfills, the Company
retains the margin generated through disposal operations that would otherwise
be earned by third-party landfills. During the year ended December 31, 1997,
the Company's captive waste (which includes waste from the Company's
collection operations and third-party haulers operating under long-term
collection contracts) constituted an average of approximately 73% of the solid
waste disposed of at its landfills. In addition, approximately 81% of the
total tonnage collected by the Company was disposed of at Company-owned
landfills.
 
  Expenses. Cost of operations include labor, maintenance and repairs,
equipment and facility rent, utilities and taxes, the costs of ongoing
environmental compliance, safety and insurance, disposal costs and costs of
independent haulers transporting Company waste to disposal sites. Disposal
costs include certain landfill taxes, host community fees, landfill site
maintenance, fuel and other equipment operating expenses and provision for
post-closure expenses, consisting of cap maintenance, groundwater monitoring,
methane gas control and recovery and leachate treatment/disposal, anticipated
to be incurred in the future.
 
  Selling, general and administrative ("SG&A") expenses include management,
clerical and administrative compensation, overhead, sales costs, community
relations expenses, provisions for estimated uncollectible accounts receivable
and unrealizable acquisition costs and management fees paid to the Company's
principal stockholder (which terminated upon closing of the Company's initial
public offering in July 1996).
 
                                      17
<PAGE>
 
  Depreciation and amortization expense includes depreciation of fixed assets,
closure costs and amortization of landfill airspace, goodwill, other
intangibles and loan origination fees. The amount of landfill amortization
expense related to airspace consumption can vary materially from landfill to
landfill depending upon the purchase price, landfill configuration and cell
development costs.
 
  Certain landfill development costs, such as engineering, upgrading,
construction, interest and permitting costs, are capitalized and amortized
based on airspace consumed. All of the Company's capitalized expenditures
relating to cell development and landfill expansion work are in connection
with cells for which the Company holds a permit for development. The Company
believes that the costs associated with engineering, owning and operating
landfills will increase in the future as a result of federal, state and local
regulations and a growing community awareness of the landfill permitting
process. Although there can be no assurance, the Company believes that it will
be able to implement price increases sufficient to offset these increased
expenses. All indirect landfill development costs, such as executive salaries,
general corporate overhead, public affairs and other corporate services, are
expensed as incurred.
 
  The Company capitalizes engineering, legal, accounting and other direct
costs incurred in connection with potential acquisitions, accounted for using
the purchase method for business combinations. The Company, however, routinely
evaluates such capitalized costs and expenses those costs related to
acquisitions not likely to occur. Indirect acquisition costs, such as
executive salaries, general corporate overhead and other corporate services,
are expensed as incurred.
 
  Accrued closure and post-closure costs represent an estimate of the current
value of the future obligations associated with closure and post-closure
monitoring of non-hazardous solid waste landfills currently owned by the
Company. Site specific closure and post-closure engineering cost estimates are
prepared annually for landfills owned by the Company. Estimated costs are
accrued based on accepted tonnage as landfill airspace is consumed. The
Company periodically updates its estimates of future closure and post-closure
costs. These changes are accounted for on a prospective basis. The Company
expects its closure and post-closure costs per ton to decrease as it expands
landfill capacity and as such costs are amortized over greater airspace.
 
  The Company has estimated that, as of December 31, 1997, closure costs
expected to occur during the operating lives of these facilities and expensed
over these facilities' useful lives will approximate $17.3 million. In
addition, the Company has estimated that, as of December 31, 1997, total costs
for post-closure activities, including cap maintenance, groundwater
monitoring, methane gas control and recovery and leachate treatment/disposal
for up to 30 years after closure in certain cases, will be approximately $54.4
million. The accruals reflect relatively young landfills with estimated
remaining lives, based on current waste flows, that range from approximately
three to 50 years, and an estimated average remaining life of greater than 20
years.
 
  The Company is in the process of conducting a comprehensive review of its
computer systems to identify the systems that could be affected by the Year
2000 issue and believes that the Year 2000 issue should not pose any
significant operational problems for the Company. The Company does not expect
that the expenditures related to the Year 2000 issue will have a material
effect on its financial position or results of operations in any year.
 
                                      18
<PAGE>
 
RESULTS OF OPERATIONS
 
  The following table sets forth items in the Company's consolidated statement
of operations as a percentage of revenues for the periods indicated.
 
<TABLE>
<CAPTION>
                                                 YEARS ENDED DECEMBER 31,
                                                ------------------------------
                                                  1995       1996       1997
                                                --------   --------   --------
<S>                                             <C>        <C>        <C>
Revenues.......................................    100.0%     100.0%     100.0%
Cost of operations.............................     57.6       53.5       54.3
Selling, general and administrative expenses...     19.6       14.6       13.9
Depreciation and amortization expense..........     21.0       21.7       18.1
                                                --------   --------   --------
Operating income...............................      1.8       10.2       13.7
Interest expense, net..........................     (9.5)      (9.7)      (5.0)
Other income...................................       --        0.3        0.2
Income tax expense.............................     (1.1)      (0.5)      (2.9)
Extraordinary loss, net of income tax..........     (3.0)      (0.8)        --
                                                --------   --------   --------
  Net income (loss)............................    (11.8)%     (0.5)%      6.0%
                                                ========   ========   ========
EBITDA margin(1)...............................     22.8%      31.9%      31.8%
</TABLE>
- --------
  (1) EBITDA margin represents EBITDA expressed as a percentage of revenues.
 
YEARS ENDED DECEMBER 31, 1997 AND 1996
 
  Revenues. Revenues in 1997 increased $64.6 million to $121.4 million from
$56.8 million in 1996. Approximately $55.8 million of the increase is
attributable to the effects of companies acquired during 1996 and 1997.
Approximately $8.8 million is attributable to increases in revenues in
operations owned more than twelve months.
 
  Cost of Operations. Cost of operations in 1997 was $65.9 million compared to
$30.4 million in 1996. As a percentage of revenues, cost of operations was
54.3% in 1997 compared to 53.5% in 1996. The increase in cost of operations as
a percentage of revenues is due to the impact of an increased number of
collection operations versus landfill operations in 1997 compared to 1996.
Collection operations generally have higher operating costs than landfill
operations.
 
  Selling, General, and Administrative Expense. SG&A expenses increased to
$16.8 million in 1997 compared to $8.3 million in 1996. As a percentage of
revenues, SG&A expenses decreased to 13.9% in 1997 from 14.6% in 1996. The
decreases in SG&A expenses as a percentage of revenues is due primarily to a
significant increase in revenue producing assets, while corporate and other
related administrative expenses increased moderately.
 
  Depreciation and Amortization Expense. Depreciation and amortization expense
was $22.0 million in 1997 compared to $12.3 million in 1996. The increase in
depreciation and amortization expense is due primarily to the Company's growth
through acquisitions. As a percentage of revenues, depreciation and
amortization expense was 18.1% and 21.7% for 1997 and 1996, respectively. The
decline in depreciation and amortization expense as a percentage of revenues
from 1996 to 1997 is due primarily to the reduction in the relative
concentration of landfill assets, which typically have higher depreciation and
amortization expense than collection operations.
 
  Net Interest Expense. Net interest expense was $6.0 million in 1997 compared
to $5.5 million in 1996, which reflects the additional debt incurred to
complete certain 1997 acquisitions.
 
  Income Taxes. The Company recorded an income tax provision of $3.5 million
in 1997 compared to $245,000 in 1996, reflecting the increased taxable income
generated, partially offset by utilization of net operating loss
carryforwards.
 
                                      19
<PAGE>
 
YEARS ENDED DECEMBER 31, 1996 AND 1995
 
  Revenues. Revenues in 1996 were $56.8 million compared to $30.0 million in
1995. Approximately $17.1 million of the increase was attributable to the
impact of the full year contribution from the CDI Acquisition. In addition,
the Company completed 16 acquisitions in 1996, which accounted for
approximately $6.3 million of the increase in revenues.
 
  Cost of Operations. Cost of operations in 1996 was $30.4 million compared to
$17.3 million in 1995, an increase corresponding primarily to the Company's
revenue growth described above. As a percentage of revenues, cost of
operations declined to 53.5% in 1996 from 57.6% in 1995, due primarily to the
following factors. The Company's proportion of landfill operations, which
generally have lower operating costs than collection operations, has increased
as a result of the full year contribution of the CDI Acquisition. In addition,
operating cost savings occurred as a result of the consolidation of the
acquired Missouri collection operations and the full year impact of the new
transfer stations opened in the Missouri region.
 
  Selling, General, and Administrative Expenses. SG&A expenses were $8.3
million in 1996 compared to $5.9 million in 1995. The increase in the SG&A
expenses resulted from the full year impact of the CDI Acquisition as well as
increased expenses from the 16 acquisitions completed in 1996. As a percentage
of revenues, SG&A expenses declined to 14.6% in 1996 from 19.6% in 1995. The
decrease in SG&A expense as a percentage of revenues was due primarily to a
significant increase in revenue, while corporate and other related
administrative expenses increased moderately. In 1996, the Company terminated
a management agreement with an affiliate of its principal shareholder,
pursuant to which a management fee of $466,000 was paid in 1996.
 
  Depreciation and Amortization Expense. Depreciation and amortization expense
for 1996 was $12.3 million compared to $6.3 million in 1995. The increase is
due primarily to the CDI Acquisition which significantly increased landfill
airspace amortization and provision for closure costs, and to a lesser extent,
the capital expenditures and goodwill associated with acquisitions consummated
in 1996. As a percentage of revenues, depreciation and amortization expense
was 21.7% during 1996 versus 21.0% in 1995. The relatively high percentages
are primarily due to the configuration of the Wheatland landfill in 1995 and
the high concentration of the Company's assets in landfills following the CDI
Acquisition in 1996. Depreciation and amortization expense is expected to
decline as a percentage of revenues in future periods as the concentration of
the Company's assets in landfills diminishes due to the full year impact of
the 1996 collection company acquisitions and as the Company reduces future
cell development cost. Net fixed assets increased to $93.7 million in 1996
from $81.3 million in 1995 and goodwill, net of accumulated amortization
expense, increased to $31.2 million in 1996 from $15.7 million in 1995.
 
  Net Interest Expense. Net interest expense was $5.5 million in 1996 compared
to $2.8 million in 1995. This increase is attributable to the full year impact
of additional debt incurred to complete the CDI Acquisition and the 16
acquisitions completed in 1996.
 
  Income Taxes. The Company recorded an income tax provision of $245,000 and
$332,000 for 1996 and 1995, respectively. The 1996 provision reflects the
Company having consolidated taxable income of $460,000. Although the Company
recorded a net loss in 1995, the Company recorded an income tax provision
because the Company's subsidiaries were not then consolidated and CDI reported
a profit.
 
  Extraordinary Loss. In 1996, the Company recognized an extraordinary loss of
$476,000, representing the write-off of unamortized debt issuance costs in
connection with the refinancing of its prior credit facility.
 
LIQUIDITY AND CAPITAL RESOURCES
 
  Due to the capital intensive nature of the solid waste industry and the
Company's focus on an acquisition-based growth strategy, the Company has used,
and expects to continue using, substantially all cash generated from
operations to fund acquisitions, capital expenditures and landfill
development. Historically, the Company has satisfied its acquisition, capital
expenditure and working capital needs primarily through equity and bank
financings. There can be no assurance that such financing will continue to be
available.
 
                                      20
<PAGE>
 
  Net cash provided by operating activities for 1997 increased to $31.1
million compared to $10.3 million for the same period in 1996. The increase
was primarily due to acquisition related activities which resulted in an
improvement in net income to $7.3 million in 1997 compared to a net loss of
$0.3 million in the prior year, an increase in depreciation and amortization
of $9.6 million over the prior period, an increase in other long term
liabilities of $6.0 million, offset by an increase in accounts receivable of
$8.6 million.
 
  Net cash used in investing activities increased to $177.4 million in 1997
from $37.7 million in the prior year. The increase was due primarily to
payments for acquisitions of $153.0 million completed in 1997 and an increase
of $10.3 million in capital expenditures for 1997 compared to 1996. The
Company's capital expenditure requirements have increased significantly,
reflecting the Company's rapid growth by acquisition and development of
additional revenue producing assets, and will increase further as the Company
continues to pursue its acquisition-based growth strategy. During 1997, the
Company spent $24.3 million in capital expenditures, of which $10.3 million
was for cell development. In fiscal year 1998, the Company expects to spend
approximately $29 million for capital expenditures on operations owned as of
December 31, 1997, of which approximately $9 million is anticipated to be used
for cell development.
 
  Net cash provided by financing activities totaled $146.4 million for 1997,
compared to $23.2 million for 1996 reflecting borrowings of $141.2 million in
1997 under the Company's then existing term and revolving credit facilities to
fund acquisitions. Repayments under the Company's Credit Facility totaled
$188.6 million, funded primarily by the net proceeds of $194.0 million from
offerings of Common Stock in May 1997 and in October 1997.
 
  The Credit Facility provides the Company with a revolving line of credit of
$140 million to be used for acquisitions (of which $20 million may be used for
working capital and letter of credit purposes). The Credit Facility bears
interest at rates per annum equal to, at the Company's discretion, either: (i)
the higher of (a) the federal funds rate plus 0.5% and (b) the prime rate,
plus an applicable margin or (ii) the London Interbank Offered Rate ("LIBOR"),
plus an applicable margin, and matures in 2002. As of March 1, 1998, the
Company had borrowed $34.4 million under the Credit Facility. As of such date,
the interest rates on the various loans under the Credit Facility ranged from
6.63% to 8.50% and the total unused availability under the Credit Facility was
approximately $105.6 million. The Company intends to apply a portion of the
net proceeds from the Offering to repay amounts outstanding under the Credit
Facility which may be reborrowed in the future.
 
INFLATION AND PREVAILING ECONOMIC CONDITIONS
 
  To date, inflation has not had a significant impact on the Company's
operations. Consistent with industry practice, most of the Company's contracts
provide for a pass through of certain costs, including increases in landfill
tipping fees and, in some cases, fuel costs. The Company therefore believes it
should be able to implement price increases sufficient to offset most cost
increases resulting from inflation. However, competitive factors may require
the Company to absorb at least a portion of these cost increases, particularly
during periods of high inflation. The Company is unable to determine the
future impact of a sustained economic slowdown.
 
SEASONALITY
 
  The Company's revenues tend to be somewhat lower in the winter months. This
is primarily attributable to the fact that: (i) the volume of waste relating
to construction and demolition activities tends to increase in the spring and
summer months; and (ii) the volume of industrial and residential waste in the
regions where the Company operates tends to decrease during the winter months.
In addition, particularly harsh weather conditions may delay the development
of landfill capacity and otherwise result in the temporary suspension of
certain of the Company's operations and could materially adversely affect the
Company's overall business, financial condition and results of operations.
 
                                      21
<PAGE>
 
                                   BUSINESS
 
INTRODUCTION
 
  American Disposal Services is a regional, integrated, non-hazardous solid
waste services company that provides solid waste collection, transfer and
disposal services primarily in the Midwest and in the Northeast. The Company
owns nine solid waste landfills and owns, operates or has exclusive contracts
to receive waste from 20 transfer stations. The Company's operations cover six
primary operating regions and its landfills and transfer stations are
supported by 17 collection divisions, which currently serve over 400,000
residential, commercial and industrial customers. The Company has adopted an
acquisition-based growth strategy and intends to continue its expansion,
generally in its existing and proximate markets. Since January 1993, the
Company has acquired 70 solid waste businesses, including eight solid waste
landfills and 66 solid waste collection companies.
 
  The Company began its operations in the Midwest and currently has operations
in the following 12 states: Arkansas, Connecticut, Illinois, Indiana, Kansas,
Kentucky, Massachusetts, Missouri, Ohio, Oklahoma, Pennsylvania and Rhode
Island. The Company's objective is to build a large profitable fully-
integrated solid waste services company with an established market presence in
secondary markets. The Company expects the current consolidation trends in the
solid waste industry to continue as many independent landfill and collection
operators lack the capital resources, management skills and technical
expertise necessary to operate in compliance with stringent environmental and
other governmental regulations.
 
  The Company's principal growth strategy is to identify and acquire solid
waste landfills located in markets that are within approximately 125 miles of
significant metropolitan centers and to secure dedicated waste streams for
such landfills by acquisition or development of transfer stations and
acquisition of collection companies.
 
  The Company's operating program generally involves a four-step process: (i)
acquiring solid waste landfills in markets that are within approximately 125
miles of significant metropolitan centers; (ii) securing captive waste streams
for its landfills through the acquisition or development of transfer stations
serving those markets, through acquisitions of collection companies and by
entering into long-term contracts directly with customers or collection
companies; (iii) making "tuck-in" acquisitions of collection companies to
further penetrate its target markets; and (iv) integrating these businesses
into the Company's operations to achieve operating efficiencies and economies
of scale. As part of its acquisition program, the Company has, and in the
future may, as specific opportunities arise, evaluate and pursue acquisitions
in the solid waste collection and disposal industry that do not strictly
conform to the Company's four-step operating program.
 
  The Company's operating strategy emphasizes the integration of its solid
waste collection and disposal operations and the internalization of waste
collected. One of the Company's goals is to maximize the captive waste streams
(which includes waste from the Company's collection operations and third-party
haulers operating under long-term collection contracts) disposed of at each of
its landfills. During the year ended December 31, 1997, the Company's captive
waste constituted an average of approximately 73% of the solid waste disposed
of at Company-owned landfills. In addition, approximately 81% of the total
tonnage collected by the Company during such period was disposed of at
Company-owned landfills. The Company plans to continue to pursue its
acquisition-based growth strategy to maximize the internalization of waste
collected and expand its presence in its existing and proximate markets.
 
RECENT DEVELOPMENTS
 
  Since the October Offering, the Company has expanded and strengthened its
market presence in its six operating regions through the acquisition of 15
solid waste businesses, which collectively included one landfill, 15
collection companies, three transfer stations, and a contract to operate a
fourth transfer station.
 
  In the New England Region, which the Company entered in September 1996, the
Company continued to expand its presence through five "tuck-in" acquisitions
of collection operations. In the Illinois Region, the
 
                                      22
<PAGE>
 
Company completed the Sexton Acquisition, which added a collection operation,
two transfer stations and one landfill to the Company's operations. In
addition, the Company has completed two collection company acquisitions in the
Illinois Region, one as a "tuck-in" to the Sexton Acquisition and one as a
"tuck-in" to the Company's existing Chicago operations.
 
  In January 1998, the Company completed the R.C. Miller Acquisition which
provide solid waste collection, transfer and recycling services in Canton,
Ohio and the surrounding counties. The R.C. Miller Acquisition further expands
the Company's presence in the Ohio Region and provides a geographical link
between the Company's Ohio and Western Pennsylvania Regions. Subsequent to the
R.C. Miller Acquisition, the Company completed three "tuck-in" acquisitions in
the Ohio Region.
 
  In October 1997, the Company repaid its $60 million term loan with a portion
of the proceeds from the October Offering and currently has a $140 million
Credit Facility. The Company is currently negotiating a larger credit facility
with its bank group, which the Company believes would provide it with more
flexibility and lower financing costs. At March 1, 1998, the outstanding debt
under the Credit Facility was $34.4 million, up from $19.7 million at December
31, 1997, primarily as a result of recent acquisitions.
 
INDUSTRY BACKGROUND
 
  In the United States, landfilling is at present the most common means of
disposing of non-hazardous municipal solid waste ("MSW"), which consists
primarily of refuse and garbage from households and commercial establishments.
The Company believes that in recent years there has been a trend towards
consolidation of landfill ownership and that a similar trend is emerging in
the solid waste collection industry, which historically has been characterized
by numerous small companies. The Company believes that these trends will
continue and are the result of several factors: (i) environmental regulations,
including Subtitle D Regulations and related state regulations and programs
have significantly increased the amount of capital and the technical expertise
required in order to own and operate a landfill; (ii) a number of
municipalities are electing to privatize the operations of their municipal
landfills as an alternative to funding the changes to these landfills that are
required in order to comply with the Subtitle D Regulations and related state
regulations and programs; (iii) as a result of heightened sensitivity to
environmental concerns by many communities, it is becoming increasingly
desirable in many markets for collection companies to provide waste reuse and
reduction programs, such as recycling and composting, in addition to
conventional waste collection services. Due in part to these trends, the
Company believes that significant opportunities exist to expand and further
integrate its operations in each of its existing markets, as well as in new
markets that meet the Company's acquisition criteria.
 
STRATEGY
 
  The Company's objective is to build a large, profitable, fully-integrated
solid waste services company with an established market presence in secondary
markets. The Company's strategy for achieving this objective is to establish a
market presence generally anchored by its landfills; to increase volume in its
markets through "tuck-in" acquisitions of collection companies and marketing
to new customers; to provide a high level of customer service; to implement
selective price increases; and to continue to implement strict cost controls
and reduce corporate overhead as a percentage of revenues. The Company
believes that this strategy of building an integrated entity should provide it
with competitive cost advantages in its targeted regional markets. The
Company's ability to implement its strategy is enhanced by the experience of
its senior managers and their knowledge of the solid waste industry. There can
be no assurance, however, that the Company will be successful in the execution
of its strategy. See "Risk Factors."
 
  The Company targets acquisitions in geographic areas characterized by one or
more of the following criteria: (i) the availability of permitted and
underutilized landfill capacity located outside of, but within 125 miles of, a
significant metropolitan center; (ii) the absence of a dominant competitor in
the area which would preclude the Company from implementing its business
strategy; (iii) anticipated economic and population growth; and (iv) near- or
medium-term scheduled closures of competing landfills.
 
                                      23
<PAGE>
 
  The Company has adopted the following four-step operating program in
executing its business strategy:
 
    1. Landfill Acquisitions. Once the Company identifies an area that
  qualifies under its target market criteria, the Company seeks to establish
  a market presence, generally by acquiring one or more landfills in that
  area that can be accessed economically from the metropolitan center or from
  the regional market area, either through direct hauling or through
  strategically located transfer stations. In evaluating a landfill
  acquisition, the Company considers, among others, the following factors:
  (i) current disposal costs together with transportation costs to the
  targeted landfill relative to transportation and disposal costs of
  potential competitors; (ii) expected landfill life; (iii) opportunities for
  landfill expansion; and (iv) projected short-term ability to secure a
  minimum of 500 tons per day of disposal volume.
 
    2. Secure Captive Waste Volumes. After the Company has acquired a
  landfill, it seeks to build a market presence and increase the utilization
  of the landfill by securing captive waste streams, which includes
  developing and acquiring transfer stations, entering into waste collection
  contracts and acquiring waste collection companies. Generally, the Company
  pursues the acquisition of collection companies that: (i) have well-
  established residential or commercial collection routes and accounts; (ii)
  own and operate transfer stations; or (iii) do not own landfills and are
  vulnerable to volatile disposal pricing, which the Company believes it can
  minimize through landfill ownership.
 
    3. "Tuck-in" Acquisitions. The Company acquires service rights,
  obligations, machinery and equipment in "tuck-in" acquisitions of
  collection companies to: (i) increase the waste stream directed to its
  landfills; (ii) maximize its market presence; and (iii) take advantage of
  economies of scale which should increase earnings and return on capital.
 
    4. Integration and Expansion of Operations. Immediately upon closing any
  acquisition, the Company integrates the acquired company into its
  operations by: (i) instituting strict cost control procedures; (ii)
  consolidating and rationalizing collection routes and pricing; (iii)
  implementing Company operating policies and procedures (including programs
  designed to improve employee productivity and equipment utilization); (iv)
  establishing a sales and marketing force; and (v) converting the acquired
  company to the Company's accounting, data processing and management
  reporting systems. During the transition period following acquisitions, the
  Company retains the management of certain companies it acquires in order to
  benefit from management's local operating knowledge and the goodwill it has
  developed. Additionally, on a selective basis, the Company seeks to expand
  the capacity of its landfills to accommodate increasing waste volumes and
  improve profitability.
 
  In addition, the Company may, as specific opportunities arise, evaluate and
pursue acquisitions in the solid waste collection and disposal industry that
do not strictly conform to the Company's four-step operating program.
 
ACQUISITION PROGRAM
 
  The Company has assembled an experienced acquisition team comprised of
operations, environmental, engineering, legal, financial and accounting
personnel, each engaged in identifying and evaluating acquisition
opportunities in order to execute its operating program. The Company has
established pre-acquisition review procedures for acquisition candidates,
including legal, financial, engineering, operational and environmental
reviews. The environmental review includes, where appropriate, investigation
of geologic, hydrogeologic and other site conditions, past and current
operations (including types of waste deposited), design and construction
records, permits, regulatory compliance history, regulatory agency records and
available soil sampling, groundwater and air monitoring results. The Company
uses regional managers to assist in the acquisition process by identifying
suitable candidates and performing pre-acquisition review and evaluation
tasks.
 
  In considering whether to proceed with an acquisition, in addition to
determining whether the candidate meets the Company's criteria described
above, the Company evaluates a number of factors, including: (i) the
acquisition candidate's historical and projected financial results; (ii) any
expected synergies with one or more of
 
                                      24
<PAGE>
 
the Company's existing operations; (iii) the proposed purchase price and the
Company's expected resultant internal rate of return on investment and the
expected impact on the Company's earnings per share; (iv) whether the
candidate will enhance the Company's ability to effect other acquisitions in
the vicinity; (v) the candidate's customer service reputation and
relationships with the local communities; (vi) the composition and size of the
candidate's customer base; (vii) the types of services provided by the
candidate; and (viii) whether the candidate has definable and controllable
liabilities, including potential environmental liabilities. The Company
believes that significant opportunities exist to acquire new landfills and to
develop its existing markets, and reviews acquisition opportunities on an
ongoing basis.
 
COMPLETED ACQUISITIONS
 
  The Company has completed 70 acquisitions of solid waste companies in 12
states since January 1993, which are summarized in the table below.
 
<TABLE>
<CAPTION>
COMPANY                   BUSINESS                PRINCIPAL LOCATION DATE ACQUIRED
- -------                   --------                ------------------ -------------
<S>                       <C>                     <C>                <C>
MISSOURI REGION:
Wheatland...............  Landfill                Scammon, KS        January 1993
Pittsburg Sanitation....  Collection              Pittsburg, KS      January 1993
Ozark Sanitation........  Collection              Carthage, MO       January 1993
Trashmaster.............  Collection              Joplin, MO         January 1993
A-1 Trash Service.......  Collection              Verona/Aurora, MO  April 1993
Tate's Transfer.........  Transfer Station        Verona/Aurora, MO  April 1993
Renfro Sanitation.......  Collection              Branson, MO        June 1993
B&B Trash...............  Collection              Pittsburg, KS      July 1993
B&B Refuse..............  Collection              Neosho, MO         December 1993
Apex Sanitation.........  Collection              Grove, OK and      December 1993
                                                  Green Forest, AR
Epps Sanitation.........  Collection              Branson, MO        December 1993
Cummings Sanitation.....  Collection              Nixa, MO           May 1994
Light Hauling...........  Collection              Branson, MO        August 1994
Poole's Sanitation......  Collection              Bentonville, AR    August 1994
Southwest Waste.........  Collection              Springfield, MO    July 1996
Nesvold Sanitation......  Collection              Seneca, MO         December 1996
Sparky's Waste Control..  Collection              Springfield, MO    January 1997
Cupp Disposal...........  Collection              Joplin, MO         June 1997
Sunset Disposal/Resource                                                         
Recovery................  Landfill and Collection Coffeyville, KS    August 1997 
L. B. Smith.............  Collection              Springfield, MO    August 1997
Supreme Sanitation......  Collection              Pittsburg, KS      August 1997
Packman.................  Collection              Coffeyville, KS    January 1998
Freeman Waste                                                                      
Management..............  Collection              Eureka Springs, OK February 1998 
ILLINOIS REGION:
Livingston..............  Landfill                Pontiac, IL        November 1995
Barbara Companies.......  Landfill, Collection,   Chicago, IL        September 1997
                          MRF and                 Morris, IL
                          Transfer Station
Yellow Recycling &                                                                 
Disposal................  Collection              Lemont, IL         December 1997 
Sexton Companies........  Landfill, Collection    Bloomington, IL    November 1997
                          and Transfer Stations   Chicago, IL
Harrell & Daughters.....  Collection              Bloomington, IL    December 1997
SOUTHWESTERN INDIANA RE-
 GION:
WMX-Evansville..........  Landfill, Collection    Evansville, IN     April 1997
                          and Transfer Station
Action Trash &                                                                 
Disposal................  Collection              Vincennes, IN      July 1997 
T&G Container...........  Collection and          Washington, IN     July 1997
                          Transfer Station
Mother Earth............  Collection,             Louisville, KY     August 1997
                          Beneficial Reuse
                          and Transfer Station
Earth First of                                                                    
Kentuckiana.............  Collection              New Albany, IN     January 1998 
</TABLE>
 
 
                                      25
<PAGE>
 
<TABLE>
<CAPTION>
COMPANY                   BUSINESS                PRINCIPAL LOCATION DATE ACQUIRED
- -------                   --------                ------------------ -------------
<S>                       <C>                     <C>                <C>
OHIO REGION:
Wyandot.................  Landfill                Upper Sandusky, OH August 1995
Environmental             Collection                                 May 1996
Transportation and
Management..............                          Findlay, OH
R&R Waste Disposal......  Collection              Findlay, OH        May 1996
Jerry's Rubbish.........  Collection              Findlay, OH        June 1996
Seneca Disposal.........  Collection              Tiffin, OH         June 1996
Ross Bros. Waste &        Collection and          Mt. Vernon, OH     September 1996
Recycling...............  Transfer Station
D&L Hauling.............  Collection              Findlay, OH        October 1996
Rutledge Trucking.......  Collection              Delaware, OH       November 1996
Morrow Sanitary                                                                    
Company.................  Collection              Mt. Gilead, OH     November 1996 
Bowers-Phase II.........  Collection and          Vickery, OH        December 1996
                          Transfer Station
Cargo Services..........  Collection              Mt. Gilead, OH     December 1996
Rumpke Waste (routes)...  Collection              Fostoria, OH       December 1996
Christiansen's..........  Collection              Sandusky, OH       May 1997
D&R Refuse..............  Collection              Kenton, OH         July 1997
Geyer Sanitation........  Collection              Galion, OH         July 1997
Didions' Garbage &        Collection                                 January 1998
Refuse..................                          Bellevue, OH
R.C. Miller               Collection              Canton, OH         January 1998
Enterprises.............  and Transfer Station
McFarland Disposal......  Collection              Ravenna, OH        February 1998
Owens Rubbish Service...  Collection              Akron, OH          February 1998
WESTERN PENNSYLVANIA RE-
 GION:
Clarion.................  Landfill and Collection Leeper, PA         June 1995
Mauthe Sanitation.......  Collection              Strattanville, PA  March 1996
Allied Waste Systems....  Collection              Youngstown, OH     February 1997
Horodyski...............  Collection              Warren, OH         April 1997
Township Garbage........  Collection              Warren, OH         July 1997
NEW ENGLAND REGION:
T&J Trucking............  Collection              Johnston, RI       September 1996
American Disposal         
Services/N.E.E.D........  Collection              Johnston, RI       September 1996
A-1 Container...........  Collection              Rehoboth, MA       January 1997
BFI-Derby District......  Collection and          Seymour, CT        May 1997
                          Transfer Station
Liberty Disposal........  Collection              Providence, RI     May 1997
A. Macera...............  Collection              Johnston, RI       August 1997
Macera Bros.............  Collection and          Cranston, RI       August 1997
                          Transfer Station
R.D. Compactor..........  Collection              Providence, RI     September 1997
Wasteline Rubbish                                                                 
Disposal................  Collection              Johnston, RI       October 1997 
Bonollo Rubbish.........  Collection              Wrentham, MA       October 1997
One Way Waste Systems...  Collection              N. Attleboro, MA
South County Companies..  Collection and          N. Kingston, RI    January 1998
                          Transfer Station
Page Hauling............  Collection              Warwick, RI        January 1998
</TABLE>
 
  Missouri Region. The Company established a market presence in the Missouri
Region in January 1993 with the acquisition of its Wheatland landfill. Since
purchasing the Wheatland landfill, the Company has acquired one transfer
station and independently developed three transfer stations. The Company also
has exclusive contracts to accept waste from two other transfer stations.
Additionally, the Company acquired 21 collection companies, including the
three operations purchased simultaneously with the Wheatland landfill. The
collection operations and transfer stations have been consolidated into three
divisions. The Company has integrated acquired companies by consolidating and
rationalizing routes and pricing, reducing overhead through consolidating an
acquired company's operations, implementing the Company's cost controls and
operating procedures, converting acquired companies to the Company's
management reporting systems and implementing a sales and marketing team.
Since the acquisition of its Wheatland landfill, the Company has increased the
waste
 
                                      26
<PAGE>
 
volume at its landfill by approximately 1,000 tons per day. Since the October
Offering, the Company has acquired two collection companies and developed one
transfer station within the region. Such activity has expanded the service
area of the Company's operations in the Missouri Region.
 
  Illinois Region. The Company established a market presence in north-central
Illinois in November 1995 with the acquisition of its Livingston landfill,
which is located approximately 90 miles from downtown Chicago. The acquisition
of the Livingston landfill was particularly attractive to the Company's
management because of the expected closing of two competing landfills that
accepted an aggregate of approximately 15,000 tons per day and the management
team's experience with the Chicago market. Since the acquisition of the
Livingston landfill, one of the competing landfills in the Chicago
metropolitan area has closed and the other is expected to close in 1998. Since
the acquisition of the Livingston landfill, the Company has increased the
waste volume at this landfill by approximately 4,000 tons per day through
intensified sales and marketing efforts. Approximately 71% of the waste volume
at the Livingston landfill is captive waste. Since the October Offering, the
Company has acquired three collection operations, two transfer stations and a
landfill in the Illinois Region.
 
  Southwestern Indiana Region. In April 1997, the Company acquired the
Blackfoot landfill, two collection companies, an exclusive transfer station
contract and a permit to develop a new transfer station, all located in the
southwestern Indiana Region (which includes western Kentucky). These
acquisitions provided the Company with the opportunity to enter the
southwestern Indiana Region and to secure a significant market share position
in that region through the acquisition of a single, fully integrated solid
waste management operation. Since the October Offering, the Company completed
the acquisition of one collection company within the Southwestern Indiana
Region.
 
  Ohio Region. The Company established a market presence in north-central Ohio
in August 1995 with the acquisition of its Wyandot landfill, which is located
within approximately 125 miles of Cleveland, Ohio and within approximately 75
miles of Toledo and Columbus, Ohio. To date, the Company has acquired 18
collection companies and has acquired, developed or secured exclusive
contracts with five transfer stations in the Ohio Region. Since the
acquisition of the Wyandot landfill, the Company has increased the waste
volume at this landfill by approximately 300 tons per day, primarily through
the acquisition of collection companies, new operating contracts with two
transfer stations and implementation of a new sales focus. To further expand
its operations, the Company is seeking to increase capacity at the Wyandot
landfill. In January 1998, the Company completed the R.C. Miller Acquisition,
which provides the Company with solid waste collection, transfer and recycling
services in Canton, Ohio and the surrounding counties. In connection with the
R.C. Miller Acquisition, the Company acquired a construction and demolition
landfill, which the Company is in the process of closing. The R.C. Miller
Acquisition expands the Company's presence in the Ohio Region and provides a
geographical link between the Company's Ohio and Western Pennsylvania Regions.
Furthermore, since the October Offering, the Company has acquired three
additional collection companies in the region.
 
  Western Pennsylvania Region. The Company entered the western Pennsylvania
Region in June 1995 with the acquisition of its Clarion landfill and an
affiliated collection company. The Clarion landfill is located within 80 miles
of both Pittsburgh and Erie, Pennsylvania. Since the acquisition of the
Clarion landfill, the Company has increased volumes to this landfill by
approximately 300 tons per day to the maximum daily limit, primarily through
the acquisition of collection companies.
 
  New England Region. The Company began operating in the New England Region in
September 1996 with the acquisition of two collection companies in Rhode
Island. The Company was attracted to the New England Region because it was
largely an unconsolidated market where no existing operator had a competitive
advantage since the State of Rhode Island owns and operates the sole landfill
in the state. As a result, the Company has focused its acquisition strategy on
collection companies. Since the October Offering, the Company has acquired
five collection companies and a contract to operate one transfer station in
the region. The Company believes that as a result of its acquisitions in the
region, it currently owns and operates the largest collection operation in
Rhode Island and has strategically positioned itself to expand its market
share in the New England Region.
 
                                      27
<PAGE>
 
OPERATIONS
 
  The Company's waste management operations include the ownership and
operation of solid waste landfills, transfer stations and waste collection
services. The Company believes that all of its landfills and transfer stations
comply with or exceed the requirements mandated by the Subtitle D Regulations
and the applicable state regulations. The Company regularly monitors incoming
waste at its landfills to determine if such wastes are in compliance with its
permits.
 
LANDFILLS
 
  The Company currently owns nine landfill operations permitted to receive
solid waste. These landfill operations are located in Illinois, Indiana, Ohio,
Pennsylvania, Kansas and Oklahoma.
 
  Each of the Company's landfill operations is located on land owned by the
Company. The permitted waste streams at each of these landfills include both
MSW and certain special waste (the type of special waste varying from landfill
to landfill). During the year ended December 31, 1997, the Company's captive
waste (including the Company's collection operations and third party haulers
operating under long-term contracts) constituted an average of approximately
73% of the solid waste disposed of at its landfills.
 
  The table and landfill descriptions below provide certain additional
information, as of December 31, 1997 regarding the nine landfills that the
Company owns and operates.
 
<TABLE>
<CAPTION>
                                           APPROXIMATE ACREAGE   APPROXIMATE
                                           ------------------- UNUSED PERMITTED
  LANDFILLS                  LOCATION      TOTAL PERMITTED (1)   AIRSPACE(2)
  ---------                  --------      ----- ------------- ----------------
                                                               (IN MILLIONS OF
                                                                 CUBIC YARDS)
<S>                     <C>                <C>   <C>           <C>
Wheatland.............. Scammon, KS           68       55             0.9
Resource Recovery...... Cherryvale, KS       282       37             2.2
Pittsburg County....... McAlester, OK         76       30             1.4
Livingston............. Pontiac, IL          556      255            27.9
Environtech............ Morris, IL           326       78             5.9
McLean................. Bloomington, IL       55       33             1.0
Blackfoot.............. Evansville, IN       379      166            17.8
Wyandot(3)............. Upper Sandusky, OH   344       87             5.7
Clarion................ Leeper, PA           606       60             3.9
                                           -----      ---            ----
  Total................                    2,692      801            66.7
                                           =====      ===            ====
</TABLE>
- --------
(1) Permitted acreage, as used in this table and in this Prospectus,
    represents the portion of the total acreage on which disposal cells and
    supporting facilities have been constructed (including any that may have
    been filled or capped) or may be constructed based upon an approval issued
    by the state generally authorizing the development or siting of a landfill
    on the acreage. Prior to actually constructing and/or operating each new
    disposal cell on the permitted acreage, it may be necessary, depending
    upon the regulatory requirements of the particular state, for the Company
    to obtain additional authorizations with respect to such cell. The portion
    of total acreage that is not currently permitted acreage is not currently
    available for waste disposal.
(2) Unused permitted airspace represents in cubic yards the estimated portion
    of the permitted acreage that has not yet been used for waste disposal but
    may be available for waste disposal after certain approvals are secured
    and, in some instances, new disposal cells are constructed. Prior to
    actually constructing and/or operating a new disposal area or cell on
    permitted acreage, it may be necessary, depending upon the regulatory
    requirements of the particular state or locality, for the Company to
    obtain additional authorizations.
(3) The Company has applied for a permit to increase the permitted acreage and
    permitted cubic airspace at the Wyandot landfill by approximately 98 acres
    and approximately 19.1 million cubic yards, respectively.
 
                                      28
<PAGE>
 
  The Company monitors the available permitted in-place disposal capacity at
each of its landfills on an ongoing basis and evaluates whether to seek to
expand this capacity. In making this evaluation, the Company considers various
factors, including the volume of waste projected to be disposed of at the
landfill, the size of the unpermitted acreage included in the landfill, the
likelihood that the Company will be successful in obtaining the necessary
approvals and permits required for the expansion and the costs that would be
involved in developing the expanded capacity. The Company also considers on an
ongoing basis the extent to which it is advisable, in light of changing market
conditions and/or regulatory requirements, to seek to expand or change the
permitted waste streams at a particular landfill or to seek other permit
modifications. Set forth below is certain information concerning certain of
the new permits, permit modifications and approvals that the Company is
currently seeking to enable it to expand its disposal capacity. There can be
no assurance that the Company will succeed in obtaining any of such permits,
permit modifications or approvals, or that additional permits, permit
modifications or approvals will not be required or that additional
requirements will not be imposed by regulatory agencies. See "Risk Factors--
Limitations on Internal Expansion" and "--Extensive Environmental Land Use
Laws and Regulations."
 
  Wheatland. The Wheatland landfill consists of approximately 68 acres.
Approximately 55 of the owned acres are permitted acres and there are
approximately 0.9 million cubic yards of unused permitted airspace. The
Company anticipates that after a planned expansion, the Wheatland landfill
would have approximately four years of total site life at current average
disposal levels (approximately 2.5 years if such expansion is not approved by
the Cherokee County Board of Commissioners). In addition, the Company has an
option to purchase an undeveloped parcel in Missouri, which has been granted a
permit to develop a landfill.
 
  Resource Recovery. The Resource Recovery landfill consists of approximately
282 acres, of which approximately 37 are permitted. There are approximately
2.2 million cubic yards of unused permitted airspace. The Resource Recovery
landfill has approximately 14 years of total site life at current average
disposal levels.
 
  Pittsburg County. The Pittsburg County landfill consists of approximately 76
acres, of which approximately 30 are permitted acres. There are approximately
1.4 million cubic yards of unused permitted airspace. The Pittsburg County
landfill would have approximately 40 years of total site life at current
average disposal levels.
 
  Livingston. The Livingston landfill consists of approximately 556 acres, of
which approximately 255 are permitted acres. There are approximately 27.9
million cubic yards of unused permitted airspace. Previously, cells developed
at the Livingston landfill have been constructed with double composite liner
systems. In September 1996, the Livingston landfill received a permit to
construct cells using a single liner composite system. The Livingston landfill
has approximately 12.5 years of total site life at current average disposal
levels, which have increased substantially since its acquisition by the
Company.
 
  Environtech. The Environtech landfill consists of approximately 326 acres of
which 78 acres have received local siting approval and state permitting. There
are approximately 5.9 million cubic yards of unused airspace. Environtech has
approximately 24 years of total site life at current average disposal levels.
 
  McLean. The McLean County landfill is located in Bloomington, Illinois. The
landfill consists of approximately 55 acres, of which approximately 33 acres
are approved for waste disposal. The current waste receipts are minimal due to
this landfill's proximity to the Livingston landfill.
 
  Blackfoot. The Blackfoot landfill in Evansville, Indiana consists of
approximately 379 acres, of which approximately 166 are permitted acres. The
site has available capacity of approximately 17.8 million cubic yards of
airspace. This includes 0.5 million cubic yards of airspace which will be
approved as a minor modification to the existing permit, pursuant to the
applicable state regulations. The Blackfoot landfill has approximately 55
years of total site life at current average disposal levels.
 
                                      29
<PAGE>
 
  Wyandot. The Wyandot landfill consists of approximately 344 acres in three
proximate locations, and the Company has an option to purchase up to
approximately 94 adjacent additional acres in the vicinity. Approximately 87
of the owned acres are permitted, and there are approximately 5.7 million
cubic yards of unused permitted airspace. Cells developed to date at the
Wyandot landfill have been constructed with double composite liner systems.
The Company has applied for a permit from applicable regulatory authorities to
use a single composite liner in constructing new cells, which the Company
believes should reduce cell development costs. In addition, the Company has
applied for a permit from the Ohio Environmental Protection Agency to expand
its landfill capacity by using the valley between two of the hills that are
currently permitted for waste disposal, as well as the option acreage. The
Company anticipates that if it exercised its option, obtained the required
permits and constructed the additional landfill areas, the Wyandot landfill
would have approximately 46 years of total site life at current disposal
levels. Currently, however, the Wyandot landfill has approximately 10 years of
total site life at current average disposal levels.
 
  Clarion. The Clarion landfill consists of approximately 606 acres, of which
approximately 60 are permitted acres. There are approximately 3.9 million
cubic yards of unused permitted airspace. Cells developed at the Clarion
landfill have been, and due to regulatory requirements will continue to be,
constructed with double liner systems. The Clarion landfill has approximately
10 years of total site life at current average disposal levels.
 
TRANSFER STATIONS
 
  The Company has an active program to acquire, develop, own, operate and
contract to receive waste volumes from transfer stations in markets which are
proximate to its operations. The use of transfer stations reduces the
Company's costs associated with the transportation of its collected waste and
also increases the market area served by the Company's landfills. Presently,
the Company owns, operates or has exclusive contracts to receive waste from a
total of 20 transfer stations, including six in the Missouri Region, three in
the Illinois Region, three in the southwestern Indiana Region, five in the
Ohio Region and three in the New England Region. Typically, the Company
acquires transfer stations that will service its Company-owned landfills and
expand its geographic service area.
 
COLLECTION OPERATIONS
 
  The Company collects solid waste from over 400,000 residential, commercial
and industrial customers through its own collection operations and through
brokerage arrangements with other haulers. The Company's collection operations
are conducted generally within a 50-mile radius of either its transfer
stations or landfills, which allows the Company to serve a geographic area
within a radius of approximately 125 miles from its landfills. The Company
also contracts with local generators of solid waste and directs the waste to
either its own landfill or to a third-party landfill or for additional
handling at one of its transfer stations. During the year ended December 31,
1997, the Company's captive waste constituted an average of approximately 73%
of the solid waste disposed of at Company-owned landfills. In addition,
approximately 81% of the total tonnage collected by the Company was disposed
of at Company-owned landfills.
 
  Fees for the Company's commercial and industrial collection services are
determined by such factors as collection frequency, type of equipment and
containers furnished, the type, volume and weight of the waste collected, the
distance to the disposal or processing facility and the cost of disposal or
processing. A majority of the Company's commercial and industrial waste
collection services are performed under contracts. Substantially all of the
Company's municipal solid waste collection services are performed under
contracts with municipalities. These contracts grant the Company exclusive
rights to service all or a portion of the residential homes in a specified
community or provide a central repository for residential waste drop-off. The
Company also provides subscription residential collection services directly to
households.
 
                                      30
<PAGE>
 
SALES AND MARKETING
 
  The Company has a coordinated marketing strategy which is formulated at the
corporate level and implemented at the regional level. In addition to
competitive pricing, the Company's marketing strategy emphasizes quality
service particularly with respect to rapid turnaround time at its landfills.
Each manager implements the Company's marketing strategy, which is overseen by
senior management. Depending upon the size of the region and its customer mix,
each manager may focus on commercial, industrial, residential or municipal
accounts to a varying degree. The Company maintains periodic contact with all
of its accounts to increase customer retention. Company salespersons call on
prospective customers in a specified geographic territory.
 
  Since the Company acquires its waste collection operations primarily from
entrepreneurs who generally do not have independent sales forces, the Company
often retains these entrepreneurs during the transition period following the
acquisition of such operations to acquaint the Company's sales force with the
acquired companies' customer base.
 
  The Company has a diverse customer base, with no single customer accounting
for more than 10% of the Company's revenues during the year ended December 31,
1997. The Company does not believe that the loss of any single customer would
have a material adverse effect on the Company's results of operations.
 
COMPETITION
 
  The solid waste collection and disposal business is highly competitive and
requires substantial amounts of capital. The Company competes with numerous
local and regional companies and, in selected areas, with the large national
waste management companies. The industry is led by several national waste
management companies, such as Waste Management, Inc., Browning-Ferris
Industries, Inc., USA Waste Services, Inc., Republic Industries, Inc. and
Allied Waste Industries, Inc., and includes numerous local and regional
companies of varying sizes and competitive resources such as Casella Waste
Systems, Inc., Eastern Environmental Services, Inc., Superior Services, Inc.
and Waste Industries, Inc. The large national companies, as well as a number
of the regional companies, are significantly larger and have greater financial
resources than the Company. The Company also competes with those counties and
municipalities that maintain their own waste collection and disposal
operations. These counties and municipalities may have financial advantages
due to the availability to them of tax revenues and tax exempt financing. The
Company competes primarily by charging competitive prices and offering quality
service. Competitors may reduce the price of their services in an effort to
expand market share or to win competitively bid municipal contracts.
 
  The solid waste collection and disposal industry is currently undergoing
significant consolidation, and the Company encounters competition in its
efforts to acquire landfills and collection operations. Accordingly, it may
become uneconomical for the Company to make further acquisitions or the
Company may be unable to locate or acquire suitable acquisition candidates at
price levels and on terms and conditions that the Company considers
appropriate, particularly in markets the Company does not already serve.
 
  Competition in the disposal industry may also be affected by the increasing
national emphasis on recycling and other waste reduction programs, which may
reduce the volume of waste deposited in landfills. See "Risk Factors--Highly
Competitive Industry" and "--Use of Alternatives to Landfill Disposal."
 
LIABILITY INSURANCE AND BONDING
 
  The Company carries a broad range of insurance for the protection of its
assets and operations that it believes is customary to the waste management
industry, including pollution liability coverage. Specifically, each of the
Company's landfills has pollution liability coverage of $10 million per
occurrence or $10 million in the aggregate subject to a $10,000 deductible.
Nevertheless, if the Company were to incur liability for environmental damage
which exceeds coverage limits or is not covered by insurance, its business,
financial condition and results of operations could be materially adversely
affected.
 
                                      31
<PAGE>
 
  The Company is required to post a performance bond or a bank letter of
credit or to provide other forms of financial assurance in connection with
closure and post-closure obligations with respect to landfills and its other
solid waste management operations and may be required to provide such
financial assurance in connection with municipal residential collection
contracts. As of December 31, 1997, the Company had outstanding approximately
$38.1 million of performance bonds. If the Company were unable to obtain
surety bonds or letters of credit in sufficient amounts, or to provide other
required forms of financial assurance, it would be unable to remain in
compliance with the Subtitle D Regulations or comparable state requirements
and, among other things, might be precluded from entering into certain
municipal collection contracts and obtaining or holding landfill operating
permits.
 
                                      32
<PAGE>
 
                                  MANAGEMENT
 
DIRECTORS AND EXECUTIVE OFFICERS
 
  Subject to the consummation of this Offering, David C. Stoller, Merril M.
Halpern, A. Lawrence Fagan, Richard T. Henshaw, III and Norman Steisel have
indicated that they will not stand for re-election to the Board of Directors
of the Company at the 1998 Annual Meeting of Stockholders of the Company (the
"Annual Meeting"). At the Annual Meeting, the Company proposes to nominate to
the Board of Directors two executive officers of the Company (Messrs. De Young
and Lavey) and five independent directors, including G.T. Blankenship. In
addition, immediately following the consummation of this Offering, Mr. De
Young will replace Mr. Stoller as Chairman of the Board of Directors and will
continue to serve as President and Chief Executive Officer of the Company.
 
  The following table sets forth information concerning the Company's
executive officers and directors as of March 1, 1998:
 
<TABLE>
<CAPTION>
  NAME                              AGE                  POSITION
  ----                              ---                  --------
<S>                                 <C> <C>
David C. Stoller...................  46 Chairman; Director
                                        President; Chief Executive Officer;
Richard De Young...................  43 Director
Richard Kogler.....................  38 Vice President; Chief Operating Officer
Stephen P. Lavey...................  36 Vice President; Chief Financial Officer
                                        Vice President; General Counsel and
Ann L. Straw.......................  44 Secretary
Lawrence R. Conrath, Sr............  41 Vice President; Controller
John J. McDonnell..................  42 Vice President--Engineering
Mary T. Ryan.......................  44 Vice President--Corporate Affairs
Merril M. Halpern..................  63 Director
A. Lawrence Fagan (1)..............  67 Director
Richard T. Henshaw, III (2)........  59 Director
G.T. Blankenship (2)...............  68 Director
Norman Steisel (1).................  54 Director
</TABLE>
- --------
(1) Member of audit committee
(2) Member of compensation committee
 
  David C. Stoller has been Chairman and a director of the Company since
January 1, 1996. He has served in the same capacities for ADS, Inc. ("ADS")
since January 1993 and County Disposal, Inc. ("CDI") since May 1995; both ADS
and CDI were predecessor entities of the Company. Since March 1998, Mr.
Stoller has been an entrepreneur with Charterhouse Group International, Inc.
("Charterhouse"), which is a private investment firm specializing in leveraged
buy-out acquisitions. From January 1997 until February 1998, he was a Managing
Director of Charterhouse. From August 1992 through December 1996, Mr. Stoller
served as the Chairman of Charterhouse Environmental Capital Group, Inc.
("Charterhouse Environmental Capital"), which provided management and
consulting services to companies with environmental operations including the
Company. Charterhouse Environmental Capital is an affiliate of Charterhouse.
Mr. Stoller was a partner at the law firm of Milbank, Tweed, Hadley & McCloy
(where he remains as "Of Counsel") from January 1989 through July 1992.
 
  Richard De Young has been Chief Executive Officer since September 4, 1997
and President and a director of the Company since January 1, 1996. He has also
served as President of ADS since April 1994 and as a director since September
1993 and was the Chief Operating Officer and Vice President for ADS from
January 1993 through April 1994. Mr. De Young has been a director of CDI since
May 1995, and its President since July 31, 1996. From June 1982 through
January 1993 he was employed by Waste Management of North America, a
subsidiary of WMX Technologies, Inc. ("WMX"), most recently as a Regional
Operations Vice President, with responsibility for landfill and collection
operations in the Midwest region.
 
                                      33
<PAGE>
 
  Richard Kogler has been a Vice President and the Chief Operating Officer of
the Company since January 1, 1996. He previously served in the same capacities
for ADS since May 1995 and as President of CDI between May 1995 and July 1996.
He has been Vice President of CDI since July 31, 1996. From October 1984
through May 1995 Mr. Kogler was employed by WMX, most recently as a Regional
Operations Vice President.
 
  Stephen P. Lavey has been a Vice President and the Chief Financial Officer
of the Company since February 1997. He was previously employed by Bank of
America from June 1990 through January 1997, most recently as a Vice President
in its Environmental Services Lending Group, specializing in the solid waste,
environmental engineering and water purification industries. Mr. Lavey is also
a Certified Public Accountant.
 
  Ann L. Straw has been a Vice President and the General Counsel of the
Company since January 1, 1996. She previously served in the same capacities
for ADS (since June 1995) and for CDI (since June 1995). She has been the
Secretary of the Company since January 1, 1996, and of ADS and CDI since July
31, 1995. From 1986 through May 1995 she was employed by WMX, most recently as
a Group Counsel for WMX's Midwest Group.
 
  Lawrence R. Conrath, Sr. has been Controller of the Company since January 1,
1996 and a Vice President since May 1996. He previously served as Controller
for ADS since May 1994. Prior to joining the Company, Mr. Conrath spent two
years with United Waste Systems, Inc., as Regional Controller of its Michigan
region. From 1978 through 1990, Mr. Conrath was employed by WMX in several
financial positions, most recently as Director of Accounting for the WMX Urban
Services Group. Mr. Conrath is also a Certified Public Accountant.
 
  John J. McDonnell has been a Vice President--Engineering of the Company
since January 1, 1996. He previously served as Environmental Engineer for ADS
(since February 1993) and CDI (since June 1995). From 1985 through February
1993, Mr. McDonnell was employed by WMX, most recently as an Engineering
Manager.
 
  Mary T. Ryan has been a Vice President--Corporate Affairs since March 1997
after joining the Company in November 1996. From May 1996 to November 1996,
she was employed by Ketchum Public Relations as Senior Vice President,
Corporate Issues. From July 1984 to April 1995 she was employed by WMX, most
recently as Vice President, Management Services.
 
  Merril M. Halpern has served as a director of the Company since January 1,
1996. Since October 1984, Mr. Halpern has served as Chairman of the Board of
Charterhouse. From 1973 to October 1984, Mr. Halpern served as President and
Chief Executive Officer of Charterhouse. Mr. Halpern is also a director of
Insignia Financial Group, Inc., a real estate management firm; and Microwave
Power Devices, Inc., a manufacturer of highly linear power amplifiers
primarily for the wireless telecommunications market ("MPD").
 
  A. Lawrence Fagan has served as a director of the Company since January 1,
1996. He has been President of Charterhouse since January 1997 and formerly
served as Executive Vice President of Charterhouse since 1984. Mr. Fagan is
also a director of MPD.
 
  Richard T. Henshaw, III has been a director of the Company since January 1,
1996. He has served as a director of ADS (since January 1993) and CDI (since
May 1995). Mr. Henshaw has been a Managing Director of Charterhouse since
January 1997 and formerly served as a Senior Vice President of Charterhouse
since 1991. Prior thereto he was a Senior Vice President of The Bank of New
York. Mr. Henshaw is also a director of Cornell Corrections, Inc., a provider
of privatized correctional services.
 
  G.T. Blankenship has been a director of the Company since January 1, 1996.
He previously served as a director of ADS (since January 1991). Mr.
Blankenship has been a self-employed private investor since 1990.
 
  Norman Steisel has been a director of the Company since July 1996. He has
served as Vice President, Business Development of Computer Sciences Corp.
since May 1997. He was the President of EnEssCo Strategies, a strategic
consulting services firm specializing in government regulated markets, from
January 1994 to May 1997. From January 1990 through December 1993, Mr. Steisel
was the First Deputy Mayor of the City of New York. Prior to 1990, he was a
Senior Vice President at Lazard Freres & Co., specializing in environmental,
corporate and municipal finance.
 
                                      34
<PAGE>
 
                      PRINCIPAL AND SELLING STOCKHOLDERS
 
  The following table sets forth certain information with respect to
beneficial ownership of the Common Stock as of March 1, 1998 and after
completion of this Offering, by: (i) each person known by the Company to be
the beneficial owner of more than 5% of the Company's Common Stock; (ii) each
of the Company's directors; (iii) the Company's Chief Executive Officer and
each of the Company's other current executive officers; and (iv) the Company's
directors and executive officers as a group.
 
<TABLE>
<CAPTION>
                                       SHARES BENEFICIALLY                 SHARES BENEFICIALLY
                                              OWNED                               OWNED
                                        PRIOR TO OFFERING     SHARES TO BE AFTER OFFERING (1)
                                       -----------------------  SOLD IN    -----------------------
NAME AND ADDRESS OF BENEFICIAL OWNERS    NUMBER     PERCENT   THE OFFERING   NUMBER     PERCENT
- -------------------------------------  ------------ ---------------------- ------------ ----------
<S>                                    <C>          <C>       <C>          <C>          <C>
Charterhouse
 Environmental Holdings,
 L.L.C. (2).............                    933,528      4.5%    933,528             --       --
Charterhouse Equity
 Partners II, L.P. (3)..                  1,255,829      6.1%  1,255,829             --       --
CDI Equity, LLC (4).....                    322,014      1.6%    322,014             --       --
Pilgrim Baxter &
 Associates, Ltd. (5)...                  1,754,020      8.5%         --      1,754,020      7.9%
Nicholas-Applegate
 Capital Mgmt. (6)......                  1,173,600      5.7%         --      1,173,600      5.3%
David C. Stoller
 (7)(8).................                    171,271     *             --        171,271     *
Richard De Young
 (7)(9).................                    215,059    1.0%           --        215,059     *
Stephen P. Lavey (7)....                     41,666     *             --         41,666     *
Merril M. Halpern (8)...                         --       --          --             --       --
A. Lawrence Fagan (8)...                         --       --          --             --       --
Richard T. Henshaw, III
 (8)....................                         --       --          --             --       --
G.T. Blankenship (10)...                     97,451     *             --         97,451     *
Norman Steisel..........                         --       --          --             --       --
Richard Kogler (7)......                     26,922     *             --         26,922     *
Ann L. Straw (7)(11)....                     21,661     *             --         21,661     *
John J. McDonnell
 (7)(12)................                     54,191     *             --         54,191     *
Lawrence R. Conrath
 (7)(13)................                     38,980     *             --         38,980     *
Mary T. Ryan (14).......                     17,725     *             --         17,725     *
All directors and
 executive officers as a
 group (13 persons)
 (7)....................                    684,926      3.2%         --        684,926      3.0%
</TABLE>
- --------
  * Less than one percent.
 (1) Assumes no exercise of the Underwriters' over-allotment option to
     purchase up to 600,000 additional shares of Common Stock. See "Use of
     Proceeds" and "Underwriting."
 (2) The address of Charterhouse Environmental Holdings, L.L.C. ("Charter
     Environmental") is c/o Charterhouse Group International, Inc., 535
     Madison Avenue, New York, New York 10022. Charterhouse Equity Partners,
     L.P. ("CEP") and StollerCo Partners, L.P. ("StollerCo") are the members
     of Charter Environmental, with a majority of the ownership interests
     being held by CEP. The general partner of CEP is CHUSA Equity Investors,
     L.P., whose general partner is Charterhouse Equity, Inc., a wholly-owned
     subsidiary of Charterhouse. As a result of the foregoing, all of the
     shares of Common Stock held by Charter Environmental would, for purposes
     of Section 13(d) of the Securities Exchange Act of 1934, be considered to
     be beneficially owned by Charterhouse. Mr. Stoller is a partner of
     StollerCo and disclaims beneficial ownership of shares of Common Stock
     held of record by Charter Environmental.
 (3) The address of Charterhouse Equity Partners II, L.P. ("CEP II") is c/o
     Charterhouse Group International, Inc., 535 Madison Avenue, New York, New
     York 10022. The general partner of CEP II is CHUSA Equity Investors II,
     L.P., whose general partner is Charterhouse Equity II, Inc., a wholly-
     owned subsidiary of Charterhouse. As a result of the foregoing, all of
     the shares of Common Stock held by CEP II would, for purposes of Section
     13(d) of the Securities Exchange Act of 1934, be considered to be
     beneficially owned by Charterhouse. Includes 2,440 shares of Common Stock
     beneficially owned by a related party prior to the Offering, 2,440 shares
     of Common Stock to be sold by the related party in the Offering and 0
     shares of Common Stock to be beneficially owned by the related party
     after the Offering.
 
                                      35
<PAGE>
 
 (4) The address of CDI Equity, LLC ("CDI Equity") is c/o Aetna Life Insurance
     Company, Conveyor RC21, 151 Farmington Avenue, Hartford, Connecticut
     06156. The member interests in CDI Equity, LLC are held as follows: 99%
     by Aetna Life Insurance Company, which is a wholly-owned subsidiary of
     Aetna Services, Inc., which is a wholly-owned subsidiary of Aetna, Inc.,
     and 1% by CDI Equity, Inc., a wholly-owned subsidiary of Aetna Life
     Insurance Company.
 (5) Information regarding Pilgrim Baxter & Associates, Ltd. is based on
     Schedule 13G filed by such person with the Securities and Exchange
     Commission as of December 31, 1997. The address of Pilgrim Baxter &
     Associates, Ltd. is 825 Duportail Road, Wayne, Pennsylvania 19087.
 (6) Information regarding Nicholas-Applegate Capital Mgmt. is based on
     Schedule 13G filed by such person with the Securities and Exchange
     Commission as of December 31, 1997. The address of Nicholas-Applegate
     Capital Mgmt. is 600 West Broadway, 29th Floor, San Diego, CA 92101.
 (7) Includes options exercisable within 60 days of March 1, 1998 to purchase
     171,271, 212,592, 41,666, 26,922, 53,195, 37,982, 21,461 and 725 shares
     granted under the American Disposal Services, Inc. 1996 Stock Option Plan
     to Messrs. Stoller, De Young, Lavey, Kogler, McDonnell and Conrath and
     Ms. Straw and Ryan, respectively. For purposes of computing the
     percentage of outstanding shares beneficially held by each person or
     group of persons named above on a given date, any security which such
     person or persons has the right to acquire within 60 days after such date
     is deemed to be beneficially owned for the purpose of computing the
     percentage ownership of such person or group of persons, but is not
     deemed to be outstanding for the purpose of computing the percentage
     ownership of any other person.
 (8) Merril M. Halpern and A. Lawrence Fagan are executive officers, directors
     and stockholders of Charterhouse, Richard T. Henshaw, III is an executive
     officer of Charterhouse and until March 1, 1998, Mr. Stoller was an
     executive officer of Charterhouse. Messrs. Halpern, Fagan, Henshaw and
     Stoller each disclaim beneficial ownership of the shares of Common Stock
     beneficially owned by Charterhouse.
 (9) Includes 2,467 shares held jointly by Mr. De Young and his wife.
(10) Includes 7,995 shares held by Mr. Blankenship's wife, of which Mr.
     Blankenship disclaims beneficial ownership.
(11) Includes 200 shares held by Ms. Straw's minor children.
(12) Includes 996 shares held by Mr. McDonnell's minor children.
(13) Includes 498 shares held jointly by Mr. Conrath and his wife and 400
     shares held in an IRA for the benefit of Mr. Conrath.
(14) Includes 6,000 shares held in an IRA for the benefit of Ms. Ryan and
     11,000 shares held jointly by Ms. Ryan and her husband.
 
                                TRANSFER AGENT
 
  The Transfer Agent for the Common Stock is the Continental Stock Transfer &
Trust Company, 2 Broadway, New York, New York 10004. Its telephone number is
(212) 509-4000.
 
                        SHARES ELIGIBLE FOR FUTURE SALE
 
  Upon completion of the Offering, the Company will have 22,116,173 shares of
Common Stock outstanding (assuming no exercise of the Underwriters'
overallotment option), all of which will be freely transferable without
restriction or registration under the Securities Act, except for any shares
purchased by an existing "affiliate" of the Company, as that term is defined
by the Securities Act (an "Affiliate"), which shares will be subject to the
resale limitations of Rule 144 adopted under the Securities Act.
 
 
                                      36
<PAGE>
 
                                 UNDERWRITING
 
  Subject to the terms and conditions of the Underwriting Agreement, the
Company and the Selling Stockholders have agreed to sell to each of the
Underwriters named below, and each of the Underwriters, for whom CIBC
Oppenheimer Corp. and Donaldson, Lufkin & Jenrette Securities Corporation
("DLJ") are acting as Representatives, has severally agreed with the Company
and the Selling Stockholders, subject to the terms and conditions of the
Underwriting Agreement, to purchase from the Company and the Selling
Stockholders, the respective number of shares of Common Stock set forth
opposite the name of such underwriter below:
 
<TABLE>
<CAPTION>
                                                                     NUMBER OF
                                                                     SHARES OF
   UNDERWRITER                                                      COMMON STOCK
   -----------                                                      ------------
   <S>                                                              <C>
   CIBC Oppenheimer Corp...........................................
   Donaldson, Lufkin & Jenrette Securities Corporation.............
                                                                     ---------
     Total.........................................................  4,000,000
                                                                     =========
</TABLE>
 
  The Representatives have advised the Company and the Selling Stockholders
that the Underwriters propose to offer the shares of Common Stock directly to
the public at the public offering price set forth on the cover page of this
Prospectus and in part to certain securities dealers at such price less a
concession of $      per share. The Underwriters may allow, and such dealers
may reallow, a concession not in excess of $      per share of certain brokers
and dealers. After the shares of Common Stock are released for sale to the
public, the offering price and other selling terms may from time to time be
changed by the Representatives. The Underwriters are obligated to take and pay
for all of the shares of Common Stock offered hereby (other than those covered
by the over-allotment option described below) if any are taken.
 
  The Company has granted the Underwriters an option, exercisable for up to 30
days after the date of this Prospectus, to purchase up to an aggregate of
600,000 additional shares of Common Stock to cover over-allotments, if any. If
the Underwriters exercise such option, the Underwriters have severally agreed,
subject to certain conditions, to purchase approximately the same percentage
thereof that the number of shares to be purchased by each of them as shown in
the foregoing table bears to the number shares of Common Stock offered hereby.
The Underwriters may exercise such option only to cover over-allotments made
in connection with the sale of the shares of Common Stock offered hereby.
 
  The Company and the Selling Stockholders have agreed to indemnify the
representatives of the Underwriters and the several Underwriters against
certain liabilities, including, without limitation liabilities under the
Securities Act.
 
  The Company's officers and directors will beneficially own an aggregate of
684,926 shares of Common Stock or options or warrants to purchase shares of
Common Stock after the Offering, have agreed not to sell, offer to sell,
distribute, pledge, grant any option for the sale of, or otherwise dispose of,
directly or indirectly, or encumber, or exercise registration rights with
respect to, any shares of Common Stock, any options or warrants
 
                                      37
<PAGE>
 
to purchase any shares of Common Stock, or any securities convertible into or
exchangeable for shares of Common Stock now owned by them or hereafter
acquired or with respect to which they have acquired or hereafter acquire the
power of disposition for a period of 90 days after the date of this Prospectus
without the prior written consent of CIBC Oppenheimer Corp. and DLJ. The
Company has also agreed not to sell, offer to sell, distribute, pledge, grant
any option for the sale of, or otherwise dispose of, directly or indirectly,
or encumber, or exercise registration rights with respect to, any shares of
Common Stock, any options or warrants to purchase any shares of Common Stock,
or any securities convertible into or exchangeable for shares of Common Stock
now owned by them or hereafter acquired or with respect to which they have
acquired or hereafter acquire the power of disposition for a period of 90 days
after the date of this Prospectus, without the prior written consent of CIBC
Oppenheimer Corp. and DLJ, subject to certain exceptions, including the
ability to issue shares of Common Stock pursuant to the shelf registration
statement, as described in the following paragraph.
 
  In addition, the Company has registered 2,500,000 shares of Common Stock
under the Securities Act pursuant to a shelf registration statement for use in
connection with future acquisitions, of which 1,233,793 shares of Common Stock
have not yet been issued. Once issued, these shares generally will be freely
tradeable by persons not affiliated with the Company; however, the Company has
agreed to use its commercially reasonable efforts to restrict such persons
from selling such shares during the 90-day period following the effective date
of the Registration Statement of which this Prospectus is a part. The Company
may from time to time increase the number of shares of Common Stock issuable
pursuant to such shelf registration statement.
 
  The Representatives, on behalf of the Underwriters, may engage in over-
allotment, stabilizing transactions, syndicate covering transactions, penalty
bids and "passive" market making in accordance with Regulation M under the
Securities Act of 1934, as amended (the "Exchange Act"). Over-allotment
involves syndicate sales in excess of the offering size, which creates a
syndicate short position. Stabilizing transactions permit bids to purchase the
underlying security so long as the stabilizing bids do not exceed a specified
maximum. Syndicate covering transactions involve purchases of the Common Stock
in the open market after the distribution has been completed in order to cover
syndicate short positions. In "passive" market making, market makers in the
Common Stock who are Underwriters or prospective underwriters may, subject to
certain limitations, make bids for or purchases of the Common Stock until the
time, if any, at which a stabilizing bid is made. Penalty bids permit the
Representatives to reclaim a selling concession from a syndicate member when
the Common Stock originally sold by such syndicate member is purchased in a
syndicate covering transaction to cover syndicate short positions. Such
stabilizing transactions, syndicate covering transactions, penalty bids and
passive market making may cause the price of the Common Stock to be higher
than it would otherwise be in the absence of such transactions. These
transactions may be effected on the Nasdaq National Market or otherwise and,
if commenced, may be discontinued at any time.
 
                                 LEGAL MATTERS
 
  The legality of the Common Stock offered hereby will be passed upon for the
Company by Proskauer Rose LLP, 1585 Broadway, New York, New York 10036.
Certain legal matters will be passed upon for the Underwriters by Morgan,
Lewis & Bockius LLP, 101 Park Avenue, New York, New York 10178.
 
                                    EXPERTS
 
  The Consolidated Financial Statements of the Company at December 31, 1995,
1996 and 1997 and for each of the three years in the period ended December 31,
1997, appearing in this Prospectus and the Registration Statement of which
this Prospectus forms a part, have been audited by Ernst & Young LLP,
independent auditors, as set forth in their reports thereon appearing
elsewhere herein, and are included in reliance upon such reports given upon
the authority of such firm as experts in accounting and auditing.
 
                                      38
<PAGE>
 
                             AVAILABLE INFORMATION
 
  The Company is subject to the informational requirements of the Securities
Exchange Act of 1934, as amended (the "Exchange Act"), and the rules and
regulations promulgated thereunder, and in accordance therewith, files reports
and other information with the Securities and Exchange Commission (the
"Commission"). These reports and other information concerning the Company may
be inspected and copied at the public reference facilities maintained by the
Commission at Room 1024, 450 Fifth Street, N.W., Washington, D.C. 20549, and
at the regional offices of the Commission located at Suite 1400, 500 West
Madison Street, Chicago, Illinois 60661 and at Suite 1300, 7 World Trade
Center, New York, New York 10048. Copies of such material can also be obtained
from the Public Reference Section of the Commission at 450 Fifth Street, N.W.,
Washington, D.C. 20549 upon payment of the fees prescribed by the Commission.
Reports, proxy, information statements and other information regarding the
Company filed electronically with the Commission are available on the
Commission's web site (http://www.sec.gov).
 
  The Company has filed with the Commission a Registration Statement on Form
S-3 (which term shall encompass any amendments and exhibits thereto) under the
Securities Act with respect of the Shares offered hereby. This Prospectus,
which forms a part of such Registration Statement, does not contain all the
information set forth in such Registration Statement, certain parts of which
are omitted in accordance with the rules and regulations of the Commission.
Statements made in this Prospectus as to the contents of any contract,
agreement or other document referred to are not necessarily complete; with
respect to each such contract, agreement or other document filed as an exhibit
to such Registration Statement, reference is made to the exhibit for a more
complete description of the matter involved, and each such statement shall be
deemed qualified in its entirety by such reference. Any interested parties may
inspect such Registration Statement, without charge, at the public reference
facilities maintained by the Commission at 450 Fifth Street, N.W., Washington,
D.C. 20549, and may obtain copies of all or any part of it from the Commission
upon payment of the fees prescribed by the Commission. Neither the delivery of
this Prospectus or any Prospectus Supplement nor any sales made hereunder or
thereunder shall under any circumstances create any implication that the
information contained herein or therein is correct as of any time subsequent
to the date hereof or thereof or that there has been no change in the affairs
of the Company since the date hereof or thereof.
 
                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE
 
  The following documents, which have been filed by the Company with the
Commission pursuant to the Exchange Act, are incorporated by reference and
made a part of this Prospectus: (i) the Company's Annual Report on Form 10-K/A
for the fiscal year ended December 31, 1996; (ii) the Company's Quarterly
Reports on Form 10-Q for the quarters ended March 31, 1997, June 30, 1997 and
September 30, 1997; (iii) all other reports filed pursuant to Section 13(a) or
15(d) of the Exchange Act since December 31, 1996, specifically including the
Company's Current Reports on Form 8-K dated April 15, 1997, May 29, 1997,
September 23, 1997 (as amended on November 13, 1997) and January 23, 1998;
(iv) the Company's Proxy Statement dated April 21, 1997 relating to the 1997
Annual Meeting of Stockholders held on May 28, 1997; (v) the Company's Proxy
Statement dated September 26, 1997 relating to the Special Meeting of
Stockholders held on October 7, 1997; and (vi) the description of the Common
Stock of the Company contained in the Company's registration statement (No.
333-36389) as filed with the Commission on September 25, 1997, as amended.
 
  All documents filed by the Company pursuant to Section 13(a), 13(c), 14 or
15(d) of the Exchange Act subsequent to the date of this Prospectus and prior
to the termination of the Offering shall be deemed to be incorporated by
reference in this Prospectus and to be a part hereof from the date of filing
of such documents. Any statement contained in a document or information
incorporated or deemed to be incorporated herein by reference shall be deemed
to be modified or superseded for purposes of this Prospectus to the extent
that a statement contained herein or in any subsequently filed document that
also is, or is deemed to be, incorporated herein by reference, modifies or
supersedes such statement. Any such statement so modified or superseded shall
not be deemed, except as so modified or superseded, to constitute a part of
this Prospectus.
 
                                      39
<PAGE>
 
  The making of a modifying or superseding statement shall not be deemed an
admission that the modified or superseded statement, when made, constituted a
misrepresentation, an untrue statement or a material fact or an omission to
state a material fact that is required to be stated or that is necessary to
make statement not misleading in light of the circumstances in which it was
made.
 
  THE COMPANY UNDERTAKES TO PROVIDE, WITHOUT CHARGE, TO EACH PERSON, INCLUDING
ANY BENEFICIAL OWNER, TO WHOM A COPY OF THIS PROSPECTUS IS DELIVERED, UPON THE
WRITTEN OR ORAL REQUEST OF SUCH PERSON, A COPY OF ANY AND ALL OF THE DOCUMENTS
OR INFORMATION REFERRED TO ABOVE THAT HAS BEEN OR MAY BE INCORPORATED BY
REFERENCE IN THE PROSPECTUS (EXCLUDING EXHIBITS TO SUCH DOCUMENTS UNLESS SUCH
EXHIBITS ARE SPECIFICALLY INCORPORATED BY REFERENCE). REQUESTS SHOULD BE
DIRECTED TO ANN L. STRAW, SECRETARY, AMERICAN DISPOSAL SERVICES, INC., 745
MCCLINTOCK DRIVE, SUITE 230, BURR RIDGE, ILLINOIS 60521, TELEPHONE: (630) 655-
1105.
 
                                      40
<PAGE>
 
                         INDEX TO FINANCIAL STATEMENTS
 
<TABLE>
<CAPTION>
                                                                           PAGE
                                                                           ----
<S>                                                                        <C>
AMERICAN DISPOSAL SERVICES, INC. AND SUBSIDIARIES:
  CONSOLIDATED FINANCIAL STATEMENTS
  Report of Independent Auditors.......................................... F-2
  Consolidated Balance Sheets at December 31, 1997 and 1996............... F-3
  Consolidated Statements of Operations for the years ended December 31,
   1997, 1996 and 1995.................................................... F-4
  Consolidated Statements of Stockholders' Equity for the years ended
   December 31, 1997, 1996 and 1995....................................... F-5
  Consolidated Statements of Cash Flows for the years ended December 31,
   1997, 1996 and 1995.................................................... F-6
  Notes to Consolidated Financial Statements.............................. F-7
</TABLE>
 
                                      F-1
<PAGE>
 
                        REPORT OF INDEPENDENT AUDITORS
 
The Board of Directors
American Disposal Services, Inc.
 
  We have audited the accompanying consolidated balance sheets of American
Disposal Services, Inc. as of December 31, 1997 and 1996, and the related
consolidated statements of operations, stockholders' equity, and cash flows
for each of the three years in the period ended December 31, 1997. These
financial statements are the responsibility of the Company's management. Our
responsibility is to express an opinion on these financial statements based on
our audits.
 
  We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to
obtain reasonable assurance about whether the financial statements are free of
material misstatement. An audit includes examining, on a test basis, evidence
supporting the amounts and disclosures in the financial statements. An audit
also includes assessing the accounting principles used and significant
estimates made by management, as well as evaluating the overall financial
statement presentation. We believe that our audits provide a reasonable basis
for our opinion.
 
  In our opinion, the financial statements referred to above present fairly,
in all material respects, the consolidated financial position of American
Disposal Services, Inc. at December 31, 1997 and 1996, and the consolidated
results of its operations and its cash flows for each of the three years in
the period ended December 31, 1997, in conformity with generally accepted
accounting principles.
 
                                          Ernst & Young LLP
 
Chicago, Illinois
February 24, 1998
 
                                      F-2
<PAGE>
 
                        AMERICAN DISPOSAL SERVICES, INC.
 
                          CONSOLIDATED BALANCE SHEETS
                             (Dollars in Thousands)
 
<TABLE>
<CAPTION>
                                                             DECEMBER 31,
                                                           ------------------
                                                             1997      1996
                                                           --------  --------
<S>                                                        <C>       <C>
                          ASSETS
Current assets:
  Cash and cash equivalents............................... $  2,426  $  2,301
  Restricted cash held in escrow..........................      337       --
  Trade receivables--net of allowance of $1,326 and $473..   23,052     9,741
  Prepaid expenses........................................    1,348     1,248
  Other current assets....................................    1,347       354
                                                           --------  --------
    Total current assets..................................   28,510    13,664
Property and equipment, net...............................  174,340    93,692
Other assets:
  Cost over fair value of net assets of acquired
   businesses, net of accumulated amortization of $3,635
   and $1,374.............................................  157,304    31,237
  Other intangible assets, net of accumulated amortization
   of $631 and $439.......................................    2,045     1,610
  Debt issuance costs, net of accumulated amortization of
   $696 and $204..........................................    2,922     2,392
  Other...................................................    7,903     2,411
                                                           --------  --------
                                                           $373,024  $144,986
                                                           ========  ========
           LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
  Accounts payable........................................ $  6,361  $  3,359
  Accrued liabilities:
    Consideration held back for certain acquisitions......    4,910     1,369
    Wages, salaries, and other compensation...............    2,665       240
    Other accrued liabilities.............................    5,708     2,640
  Deferred revenues.......................................    5,785     2,245
  Current portion of long-term debt and capital lease
   obligations............................................    2,360     2,572
                                                           --------  --------
    Total current liabilities.............................   27,789    12,425
Long-term debt and capital lease obligations, net of
 current portion..........................................   20,788    65,445
Accrued environmental and landfill costs..................   12,450     7,603
Deferred income taxes.....................................    2,577     1,416
Other long-term liabilities...............................   12,045       --
Stockholders' equity:
Preferred stock, $0.01 par value; 5,000,000 shares
 authorized; none issued and outstanding in 1997 and
 1996.....................................................      --        --
Common stock, $0.01 par value; 60,000,000 shares
 authorized; shares issued and outstanding 1997--
 19,323,100 and 1996--8,872,381...........................      193        89
Warrants outstanding......................................      --        107
Additional paid-in capital................................  298,110    66,170
Accumulated deficit.......................................     (928)   (8,269)
                                                           --------  --------
                                                            297,375    58,097
                                                           --------  --------
                                                           $373,024  $144,986
                                                           ========  ========
</TABLE>
                            See accompanying notes.
 
                                      F-3
<PAGE>
 
                        AMERICAN DISPOSAL SERVICES, INC.
 
                     CONSOLIDATED STATEMENTS OF OPERATIONS
                 (Dollars in Thousands, Except per Share Data)
 
<TABLE>
<CAPTION>
                                                   YEARS ENDED DECEMBER 31,
                                                   --------------------------
                                                     1997     1996     1995
                                                   --------  -------  -------
<S>                                                <C>       <C>      <C>
Revenues.......................................... $121,363  $56,804  $30,004
Cost of operations................................   65,947   30,376   17,286
Selling, general, and administrative expenses.....   16,821    8,328    5,882
Depreciation and amortization.....................   21,975   12,334    6,308
                                                   --------  -------  -------
Operating income..................................   16,620    5,766      528
Interest expense..................................   (6,223)  (5,745)  (3,030)
Interest income...................................      201      260      189
Other income......................................      274      179      --
                                                   --------  -------  -------
Income (loss) before income taxes and
 extraordinary item...............................   10,872      460   (2,313)
Income tax expense................................    3,531      245      332
                                                   --------  -------  -------
Income (loss) before extraordinary item...........    7,341      215   (2,645)
Extraordinary item--loss on early retirement of
 debt.............................................      --      (476)    (908)
                                                   --------  -------  -------
Net income (loss).................................    7,341     (261)  (3,553)
Preferred stock dividend..........................      --      (109)    (190)
                                                   --------  -------  -------
Net income (loss) applicable to common
 stockholders..................................... $  7,341  $  (370) $(3,743)
                                                   ========  =======  =======
Basic earnings per common share:
 Income (loss) before extraordinary item.......... $   0.56  $  0.02  $ (0.85)
 Extraordinary item...............................      --     (0.07)   (0.27)
                                                   --------  -------  -------
 Net income (loss)................................ $   0.56  $ (0.05) $ (1.12)
                                                   ========  =======  =======
Diluted earnings per common share:
 Income (loss) before extraordinary item.......... $   0.53  $  0.01  $ (0.85)
 Extraordinary item...............................      --     (0.06)   (0.27)
                                                   --------  -------  -------
 Net income (loss)................................ $   0.53  $ (0.05) $ (1.12)
                                                   ========  =======  =======
</TABLE>
 
                            See accompanying notes.
 
                                      F-4
<PAGE>
 
                        AMERICAN DISPOSAL SERVICES, INC.
 
                CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY
                             (Dollars in Thousands)
 
<TABLE>
<CAPTION>
                            COMMON STOCK                ADDITIONAL                  TOTAL
                          -----------------  WARRANTS    PAID-IN   ACCUMULATED  STOCKHOLDERS'
                            SHARES   AMOUNT OUTSTANDING  CAPITAL     DEFICIT       EQUITY
                          ---------- ------ ----------- ---------- -----------  -------------
<S>                       <C>        <C>    <C>         <C>        <C>          <C>
Balance at December 31,
 1994...................   2,382,345  $ 24     $ 107      $ 16,157     $(4,156)      $ 12,132
Issuance of common
 stock, net of issuance
 costs..................   3,280,520    33        --       25,433           --         25,466
Dividends on preferred
 stock..................          --    --        --           --         (190)          (190)
Net loss................          --    --        --           --       (3,553)        (3,553)
                          ----------  ----     -----     --------      -------       --------
Balance at December 31,
 1995...................   5,662,865    57       107       41,590       (7,899)        33,855
Issuance of common
 stock, net of issuance
 costs..................   3,162,500    32        --       24,573           --         24,605
Exercise of common stock
 warrants and options...      47,016    --        --            7           --              7
Dividends on preferred
 stock..................          --    --        --           --         (109)          (109)
Net loss................          --    --        --           --         (261)          (261)
                          ----------  ----     -----     --------      -------       --------
Balance at December 31,
 1996...................   8,872,381    89       107       66,170       (8,269)        58,097
Issuance of common
 stock, net of issuance
 costs..................   8,925,000    89        --      193,870           --        193,959
Stock issued for
 acquisitions...........   1,416,912    14        --       37,067           --         37,081
Exercise of common stock
 warrants and options...     108,807     1      (107)         647           --            541
Tax benefit from
 exercise of stock
 options................          --    --        --          356           --            356
Net income..............          --    --        --           --        7,341          7,341
                          ----------  ----     -----     --------      -------       --------
Balance at December 31,
 1997...................  19,323,100  $193     $  --     $298,110      $  (928)      $297,375
                          ==========  ====     =====     ========      =======       ========
</TABLE>
 
 
                             See accompanying notes
 
                                      F-5
<PAGE>
 
                        AMERICAN DISPOSAL SERVICES, INC.
 
                     CONSOLIDATED STATEMENTS OF CASH FLOWS
                             (Dollars in Thousands)
 
<TABLE>
<CAPTION>
                                                  YEARS ENDED DECEMBER 31,
                                                 -----------------------------
                                                   1997       1996      1995
                                                 ---------  --------  --------
<S>                                              <C>        <C>       <C>
OPERATING ACTIVITIES
Net income (loss)..............................  $   7,341  $   (261) $ (3,553)
Adjustments to reconcile net income (loss) to
 net cash provided by operating activities:
  Extraordinary item, net......................         --       476       908
  Depreciation and amortization................     21,975    12,334     6,308
  Provision for environmental and landfill
   costs.......................................        597       571       292
  Deferred income taxes........................        600       176        47
  Gain on sale of fixed assets.................       (212)      (98)       --
  Changes in operating assets and liabilities,
   net of effects from acquisitions:
    Trade receivables..........................     (8,630)   (2,600)     (340)
    Prepaid expenses and other assets..........     (6,187)   (1,071)     (161)
    Accounts payable, accrued liabilities and
     accrued environmental and landfill costs..      7,287       153     1,846
    Deferred revenue...........................      2,310       656       254
    Other long-term liabilities................      6,045        --        --
                                                 ---------  --------  --------
Net cash provided by operating activities......     31,126    10,336     5,601
INVESTING ACTIVITIES
Capital expenditures...........................    (24,320)  (14,003)   (6,173)
Cost of acquisitions...........................   (153,048)  (23,660)  (62,201)
                                                 ---------  --------  --------
Net cash used in investing activities..........   (177,368)  (37,663)  (68,374)
FINANCING ACTIVITIES
Net proceeds from issuances of common stock....    193,959    24,605    25,466
Exercise of common stock options...............        541         7        --
Tax benefit associated with stock options......        356        --        --
Proceeds from issuances from long-term debt....    141,177    66,950    32,568
Debt issuance costs............................     (1,022)   (2,596)     (946)
Repayments of indebtedness.....................   (188,644)  (51,162)   (2,698)
Redemption of preferred stock..................         --    (1,950)       --
Net proceeds from issuance of preferred stock..         --        --     1,908
Preferred stock dividend.......................         --      (109)     (190)
Proceeds from (payment of) note payable to
 stockholders..................................         --   (12,500)   12,500
                                                 ---------  --------  --------
Net cash provided by financing activities......    146,367    23,245    68,608
                                                 ---------  --------  --------
Net increase (decrease) in cash and cash
 equivalents...................................        125    (4,082)    5,835
Cash and cash equivalents, at beginning of
 year..........................................      2,301     6,383       548
                                                 ---------  --------  --------
Cash and cash equivalents, at end of year......  $   2,426  $  2,301  $  6,383
                                                 =========  ========  ========
NONCASH ACTIVITIES
Issuance of common stock for certain
 acquisitions..................................  $  37,081  $     --  $     --
Issuance of notes payable for certain
 acquisitions..................................      2,598        --        --
Consideration held back or held in escrow for
 certain acquisitions..........................     10,910     1,369        --
SUPPLEMENTAL CASH FLOW INFORMATION
Cash paid for interest.........................  $   6,814  $  6,222  $  2,515
Cash (refunds) paid for income taxes...........      2,260      (159)      478
</TABLE>
 
                             See accompanying notes
 
                                      F-6
<PAGE>
 
                       AMERICAN DISPOSAL SERVICES, INC.
 
                  NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
 
                       DECEMBER 31, 1997, 1996 AND 1995
 
1. FORMATION AND BASIS OF PRESENTATION
 
  ADS, Inc. (ADS) was organized January 15, 1991, to acquire, develop, and
operate non-hazardous municipal solid waste disposal, collection, and transfer
operations and provide non-hazardous solid waste disposal management services
to commercial, industrial, and residential customers. During 1993, an
affiliate of Charterhouse Equity Partners, L.P. (CEP) purchased a controlling
interest in ADS.
 
  County Disposal, Inc. (County) was incorporated by Charterhouse Equity
Partners II, L.P. (CEPII) on April 27, 1995, for the purpose of acquiring
certain net assets of Envirite Corporation (Envirite). On April 28, 1995
Envirite and County entered into an Asset Purchase Agreement whereby County
agreed to purchase from Envirite certain landfill facilities and waste
transportation and collection equipment located in Livingston County,
Illinois, and Wyandot County, Ohio; all of the issued and outstanding capital
stock of County Environmental Services, Inc., a wholly-owned subsidiary of
Envirite, which owned and operated a landfill facility and waste
transportation and collection equipment located in Clarion County,
Pennsylvania; and certain related assets and assumption of certain
liabilities.
 
  Effective January 1, 1996, the stockholders of ADS and County exchanged
their shares for shares of a newly created holding company by the name of
American Disposal Services, Inc. (the Company). This share exchange (the
Exchange) qualifies as a transfer of companies under common control as
affiliates of Charterhouse Group International, Inc. are the general partners
and in control of CEP and CEPII and, accordingly, the transaction has been
accounted for at historical cost in a manner similar to pooling of interests
accounting. The financial statements have been prepared as if this Exchange
had occurred as of December 31, 1994.
 
  In July 1996, the Company issued 3,162,500 shares of common stock at $9.00
per share in its initial public offering. Proceeds from the offering, net of
underwriting commissions and related expenses, were $24.6 million. In April
1997, the Company issued 4,600,000 shares of common stock at $16.50 per share
in a public offering. Proceeds from the offering, net of underwriting
commissions and related expenses, were $70.1 million. The proceeds from each
of these offerings were used to finance acquisitions and pay down a portion of
the debt facility.
 
 
  In October 1997, the Company completed a public offering of 6,837,000 shares
of common stock at $30.50 per share. Of the 6,837,000 shares, 4,325,000 shares
were issued and sold by the Company and 2,512,000 shares were sold by selling
stockholders. Proceeds to the Company from the offering, net of underwriting
commissions and related expenses, were $125.3 million. Immediately following
the offering, the Company had 19,129,542 shares of common stock issued and
outstanding. The offering proceeds were used to finance acquisitions and pay
down a portion of the debt facility.
 
2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
PRINCIPLES OF CONSOLIDATION
 
  The consolidated financial statements include the accounts of the Company
and its subsidiaries. All significant intercompany balances and transactions
have been eliminated.
 
CONCENTRATION OF CREDIT RISK
 
  Financial instruments that potentially subject the Company to concentration
of credit risks consist primarily of trade receivables. Credit risk on trade
receivables is minimized as a result of the large and diverse nature of
 
                                      F-7
<PAGE>
 
                       AMERICAN DISPOSAL SERVICES, INC.
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES--(CONTINUED)
 
the Company's customer base. No single group or customer represents greater
than 10% of total accounts receivable. The Company maintains an allowance for
losses based on the expected collectibility of accounts receivable. Credit
losses have been within managements expectations.
 
FAIR VALUE OF FINANCIAL INSTRUMENTS
 
  Trade receivables, trade payables, and debt obligations are carried at cost
which approximates fair value.
 
USE OF ESTIMATES
 
  The preparation of financial statements in conformity with generally
accepted accounting principles requires management to make estimates and
assumptions that affect the amounts reported in the financial statements and
accompanying notes. Actual results could differ from those estimates.
 
RECLASSIFICATIONS
 
  Certain reclassifications have been made to prior year's financial
statements to conform with the 1997 presentation.
 
CASH AND CASH EQUIVALENTS
 
  Cash and cash equivalents represent cash in banks and liquid investments
with original maturities of three months or less.
 
RESTRICTED CASH HELD IN ESCROW
 
  Cash held in escrow represents cash held in banks restricted to fund
obligations incurred in acquiring businesses. These obligations are expected
to be funded in 1998.
 
PROPERTY AND EQUIPMENT
 
  Property and equipment are recorded at cost. Depreciation of equipment,
which includes amortization of equipment capitalized under lease obligations,
is computed using the straight-line method over the estimated useful lives of
the respective assets assuming no salvage values as follows:
 
<TABLE>
     <S>                                                        <C>
     Vehicles and equipment....................................  3 to 12 years
     Buildings................................................. 25 to 30 years
</TABLE>
 
  Expenditures for major renewals are capitalized, and expenditures for
routine maintenance and repairs are charged to expense as incurred.
 
  Capitalized landfill costs include expenditures for land and related
airspace, permitting costs, preparation costs, and capitalized interest.
Landfill permitting and preparation costs represent only direct costs related
to these activities, including legal, engineering, construction of landfill
improvements, cell development costs, and the direct costs of Company
personnel dedicated for these purposes. Preparation costs for individual
secure land disposal cells are recorded in property and equipment and
amortized as the airspace is filled. Amortization rates are based on
accounting estimates by management determined primarily from the results of
engineering studies of the total estimated preparation cost expected to be
incurred over the life of the related landfill. Landfill costs capitalized in
1997, 1996 and 1995 include capitalized interest of approximately $639,000,
$481,000, and $0, respectively.
 
INTANGIBLE ASSETS
 
  The cost over fair value of net assets of acquired businesses represents
long-lived intangible assets including routes, tradenames and goodwill and is
amortized on a straight-line method over periods not exceeding 40 years. Other
intangible assets, substantially all of which are covenants not to compete and
customer lists, are amortized
 
                                      F-8
<PAGE>
 
                       AMERICAN DISPOSAL SERVICES, INC.
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES--(CONTINUED)
 
on the straight-line method over their estimated lives, typically no more than
8 years. Amortization expense for fiscal years 1997, 1996, and 1995 related to
intangible assets was approximately $3.0 million, $1.0 million, and $1.4
million, respectively. In 1995, the Company determined not to enforce certain
covenants not to compete which arose from 1993 transactions. The net book
value of such covenants of $505,000 was fully written-off and included in 1995
amortization expense.
 
  The Company continually evaluates the value and future benefits of its
intangibles. The Company assesses recoverability from future operations using
income from operations of the related acquired business as a measure. Under
this approach, the carrying value would be reduced if it becomes probable that
the Company's best estimate for expected future cash flows of the related
business would be less than the carrying amount of the intangible over the
remaining amortization period. For the three year period ended December 31,
1997, there were no adjustments to the carrying amounts of intangibles
resulting from these evaluations.
 
DEFERRED ACQUISITION COSTS
 
  The Company capitalizes engineering, legal, accounting, and other direct
costs paid to outside parties that are incurred in connection with potential
acquisitions. The Company, however, routinely evaluates such capitalized costs
and charges to expense those relating to abandoned acquisition candidates.
Indirect acquisition costs, such as executive salaries, general corporate
overhead, and other corporate services are expensed as incurred. Net deferred
acquisition costs, included in other intangible assets, were approximately
$478,000 and $545,000 at December 31, 1997 and 1996, respectively.
 
ACCRUED ENVIRONMENTAL AND LANDFILL COSTS
 
  Accrued environmental and landfill costs represent landfill accruals which
are provided for environmental compliance costs and closure and post-closure
costs. These accruals are based on accounting estimates by management
determined primarily from the results of engineering studies and reviews and
on interpretation of the technical standards of the Environmental Protection
Agency's Subtitle D regulations, or the approved state counterpart, and
recently promulgated air emissions standards under the Clean Air Act, as they
apply on a state-by-state basis. The Company typically provides accruals for
these costs as permitted airspace of such facilities is consumed. Closure and
post-closure monitoring and maintenance costs represent the costs related to
cash expenditures yet to be incurred when a landfill facility ceases to accept
waste and closes. Certain of these accrued environmental and landfill costs,
principally capping, leachate collection and removal, and methane gas control
and recovery, are operating and maintenance costs to be incurred during the
30-year period after the facility closes, but are accrued during the operating
life of the site in accordance with the landfill operation requirements of
Subtitle D and the EPA's recently promulgated air emissions standards. An
environmental and landfill cost accrual is provided as a liability assumed for
purchased landfill operations based on permitted airspace consumed prior to
the acquisition date and is included in the purchase price allocation (see
Note 3). The Company has estimated that, as of December 31, 1997, post-closure
expenses, including cap maintenance, groundwater monitoring, methane gas
control and recovery and leachate treatment/disposal for up to 30 years after
closure in certain cases, will approximate $17.3 million. In addition, the
Company has estimated that, as of December 31, 1997, closure costs expected to
occur during the operating lives of these facilities will approximate $54.4
million. These accruals are reviewed by management periodically and revised
prospectively for any significant changes in future cost estimates.
 
INCOME TAXES
 
  Deferred tax assets and liabilities are determined based on differences
between financial reporting and tax bases of assets and liabilities and are
measured using the enacted tax rates and laws that will be in effect when the
differences are expected to reverse.
 
                                      F-9
<PAGE>
 
                       AMERICAN DISPOSAL SERVICES, INC.
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES--(CONTINUED)
 
 
REVENUE RECOGNITION
 
  Landfill revenues are recorded at the date of actual waste disposal.
Revenues billed prior to the performance of services are deferred and recorded
as income in the period in which the related services are rendered, generally
over a three-month period.
 
ADVERTISING COSTS
 
  Advertising costs are expensed as incurred. Advertising costs for fiscal
years 1997, 1996 and 1995 were approximately $438,000, $181,000 and $84,000,
respectively.
 
EARNINGS PER SHARE
 
  In 1997, the Financial Accounting Standards Board issued Statement of
Financial Accounting Standards No. 128, "Earnings per Share" (SFAS 128), which
replaced the calculation of primary and fully diluted earnings per common
share with basic and diluted earnings per common share. Unlike primary
earnings per common share, basic earnings per common share excludes any
dilutive effects of options, warrants and convertible securities. All earnings
(loss) per common share amounts for all periods have been presented, and where
appropriate, restated to conform to the SFAS 128 requirements (see Note 12).
In restating earnings (loss) per common share to comply with the SFAS 128
requirements, the Company applied the recently issued Staff Accounting
Bulletin No. 98 (SAB 98). As a result of applying the provisions of SAB 98,
the Company has restated 1995 loss per common share to exclude the anti-
dilutive effect of options and warrants granted within one year of the
Company's initial public offering and with exercise prices below the initial
public offering price of $9.00 per common share.
 
EMPLOYEE STOCK OPTIONS
 
  The Company typically grants stock options for a fixed number of shares to
employees with an exercise price equal to the fair value of the shares at the
date of grant. The Company accounts for such stock option grants in accordance
with Accounting Principles Board Opinion No. 25 "Accounting for Stock Options
Issued to Employees" (APB 25), and, accordingly, typically recognizes no
compensation expense for these stock option grants.
 
IMPACT OF RECENTLY ISSUED ACCOUNTING STANDARDS
 
  In October 1996, the Accounting Standards Executive Committee of the
American Institute of Certified Public Accountants issued Statement of
Position ("SOP") 96-1, "Environmental Remediation Liabilities." The SOP is
effective for fiscal years beginning after December 15, 1996, and provides
that environmental remediation liabilities should be accrued when the criteria
of FAS 5, "Accounting for Contingencies," are met. Included in the SOP are
benchmarks to aid in the determination of when such criteria are met and
environmental liabilities should be recognized. The adoption of SOP 96-1 did
not have a material effect on the Company's consolidated financial position,
results of operation, or cash flows.
 
  In June 1997, the FASB issued SFAS No. 130, "Reporting Comprehensive
Income." SFAS No. 130 establishes standards for reporting and display of
comprehensive income and its components in the financial statements. SFAS No.
130 is effective for fiscal years beginning after December 15, 1997. The
adoption of SFAS No. 130 will have no impact on the Company's consolidated
financial position, results of operations, or cash flows.
 
  In June 1997, the FASB issued SFAS No. 131, "Disclosures about Segments of
an Enterprise and Related Information." SFAS No. 131 establishes standards for
the way that public business enterprises report information about operating
segments in annual financial statements and requires that those enterprises
report selected
 
                                     F-10
<PAGE>
 
                       AMERICAN DISPOSAL SERVICES, INC.
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES--(CONTINUED)
 
information about operating segments in interim financial reports issued to
stockholders. It also establishes standards for related disclosures about
products and services, geographic areas, and major customers. SFAS No. 131 is
effective for financial statements for fiscal years beginning after December
15, 1997. The Company has evaluated the disclosure requirements of SFAS No.
131 and believes that its adoption will have no material impact on its future
disclosure requirements.
 
3. ACQUISITIONS
 
  The acquisitions below have been accounted for using the purchase method of
accounting and, accordingly, the results of their operations have been
included in the Company's results of operations from their respective
acquisition dates. The purchase prices have been allocated to the assets
acquired and liabilities assumed based on their fair values at their
respective acquisition dates with the residual allocated to cost over fair
value of net assets acquired.
 
  During 1997 the Company acquired 28 non-hazardous solid waste businesses,
consisting of 28 collection operations, seven transfer stations, four
landfills, and two beneficial reuse facilities. During 1996, the Company
acquired sixteen non-hazardous solid waste businesses, consisting of 16
collection operations and two transfer stations. As described in Note 1, the
Company acquired three non-hazardous solid waste landfills and a solid waste
collection operation (the Envirite Acquisition) during 1995.
 
  The Company has not completed its valuation of certain of its 1997 purchases
and the purchase price allocations are subject to change when additional
information concerning asset and liability valuations is completed.
 
  The purchase prices allocated to the net assets acquired are as follows (in
thousands):
 
<TABLE>
<CAPTION>
                                                           DECEMBER 31,
                                                     --------------------------
                                                       1997     1996     1995
                                                     --------  -------  -------
   <S>                                               <C>       <C>      <C>
   Property and equipment........................... $ 74,472  $ 8,425  $62,288
   Accounts receivable and inventory................    4,781      810    3,363
   Other assets.....................................    1,480      785    1,664
   Cost over fair value of net assets acquired......  128,328   15,642    3,060
   Total liabilities assumed........................   (5,424)    (633)  (8,174)
                                                     --------  -------  -------
   Total purchase price............................. $203,637  $25,029  $62,201
                                                     ========  =======  =======
</TABLE>
 
  The Company has entered into certain acquisition agreements that include
consideration that is issuable upon the resolution of certain contingent
incentives available to the former owners of the acquired businesses. These
contingencies are not recorded as liabilities or shown as outstanding
securities unless the outcome of the contingency is determinable beyond
reasonable doubt. The resolution of these contingencies could result in
additional payments in cash or shares of Company common stock (see Note 12)
through September 10, 2006. The additional cash payments are not expected to
exceed $37,500,000.
 
                                     F-11
<PAGE>
 
                       AMERICAN DISPOSAL SERVICES, INC.
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
 
3. ACQUISITIONS--(CONTINUED)
 
  The pro forma unaudited results of operations for the years ended December
31, 1997 and 1996, assuming each acquisition above and the public offerings
(see Note 1) had occurred on January 1, 1996, are as follows (in thousands,
except per share data):
 
<TABLE>
<CAPTION>
                                                             YEARS ENDED
                                                            DECEMBER 31,
                                                        ---------------------
                                                           1997       1996
                                                        ---------- ----------
   <S>                                                  <C>        <C>
   Revenues............................................ $  160,869 $  142,380
   Operating income....................................     24,424     18,269
   Income before extraordinary item....................     15,272     11,319
   Net income applicable to common stockholders........     15,272     10,843
   Pro forma basic earnings per common share:
     Income before extraordinary item.................. $     0.80 $     0.64
     Extraordinary item................................         --      (0.03)
                                                        ---------- ----------
     Net income........................................ $     0.80 $     0.61
                                                        ========== ==========
   Pro forma weighted average common stock
    outstanding........................................ 19,188,674 17,653,952
                                                        ========== ==========
   Pro forma diluted earnings per common share:
     Income before extraordinary item.................. $     0.77 $     0.63
     Extraordinary item................................         --      (0.03)
                                                        ---------- ----------
     Net income........................................ $     0.77 $     0.60
                                                        ========== ==========
   Pro forma weighted average common stock and common
    stock equivalent shares outstanding................ 19,833,665 18,021,839
                                                        ========== ==========
</TABLE>
 
  The pro forma results do not purport to be indicative of the results of
operations which actually would have resulted had the acquisitions occurred on
January 1, 1996 nor are they necessarily indicative of future operating
results.
 
4. PROPERTY AND EQUIPMENT
 
  Property and equipment are summarized as follows (in thousands):
 
<TABLE>
<CAPTION>
                                                                DECEMBER 31,
                                                              -----------------
                                                                1997     1996
                                                              --------  -------
   <S>                                                        <C>       <C>
   Land...................................................... $ 18,229  $ 5,417
   Landfills.................................................  120,949   78,547
   Buildings.................................................   16,014    3,285
   Vehicles and equipment....................................   52,903   23,977
                                                              --------  -------
                                                               208,095  111,226
   Less: Accumulated depreciation and amortization...........  (33,755) (17,534)
                                                              --------  -------
                                                              $174,340  $93,692
                                                              ========  =======
</TABLE>
 
                                     F-12
<PAGE>
 
                       AMERICAN DISPOSAL SERVICES, INC.
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
 
5. OBLIGATIONS
 
<TABLE>
<CAPTION>
                                                                  DECEMBER 31,
                                                                 ---------------
                                                                  1997    1996
                                                                 ------- -------
   <S>                                                           <C>     <C>
   Long-term debt:
     Acquisition loan, ING Capital Corporation.................  $19,666 $41,506
     Term loan, ING Capital Corporation........................      --   24,750
     Other borrowings, with interest rates ranging from 6.0% to
      11.0%....................................................    3,171   1,101
   Capital lease obligations:
     Capital lease obligations with interest and principal due
      monthly through 1999, at various interest rates ranging
      from 9.50% to 9.75%, secured by equipment................      311     660
                                                                 ------- -------
                                                                  23,148  68,017
   Less: Current portion.......................................    2,360   2,572
                                                                 ------- -------
   Long-term obligations, net of current portion...............  $20,788 $65,445
                                                                 ======= =======
</TABLE>
 
  In May 1997, the Company increased the amount of its revolving credit and
term loan facility (the "Credit Facility") with ING (U.S.) Capital Corporation
from $125 million to $200 million. At that time, the Credit Facility provided
the Company with a term loan of $60 million and a revolving credit facility of
$140 million to be used for acquisitions (of which $20 million could be used
for working capital and letter of credit purposes). In October 1997, the
Company repaid its $60 million term loan with the proceeds of a public
offering, and at December 31, 1997 maintains its $140 million revolving credit
facility. The various loans and lines of credit under the Credit Facility bear
interest at rates per annum equal to, at the Company's discretion, either: (i)
the prime rate, plus an applicable margin; or (ii) the London Interbank
Offered Rate ("LIBOR"), plus an applicable margin, and mature in 2002. As of
December 31, 1997, the interest rates on the acquisition loan under the Credit
Facility ranged from 7.00% to 8.50%. The Credit Facility is secured by
substantially all of the assets of the Company. The Company's ability to use
the acquisition facility is based upon a number of covenants, including the
maintenance of specified debt to equity and fixed charge coverage ratios. At
December 31, 1997 the Company was in compliance with the terms of these
covenants. In connection with refinancings during 1996 and 1995, the Company
recognized an extraordinary loss, net of income tax benefit, of $476,000 and
$908,000, respectively, representing unamortized deferred debt issuance costs
related to refinanced obligations.
 
  At December 31, 1997, maturities of obligations (excluding capital lease
obligations) are as follows (in thousands):
 
<TABLE>
   <S>                                                                   <C>
   1998................................................................. $ 2,160
   1999.................................................................     601
   2000.................................................................     180
   2001.................................................................     191
   2002 and thereafter..................................................  19,705
                                                                         -------
                                                                         $22,837
                                                                         =======
</TABLE>
 
                                     F-13
<PAGE>
 
                       AMERICAN DISPOSAL SERVICES, INC.
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
6. INCOME TAXES
 
  Deferred income taxes reflect the net tax effects of temporary differences
between the amount of assets and liabilities for financial reporting and
income tax purposes. Significant components of the Company's deferred tax
assets and liabilities were as follows (in thousands):
<TABLE>
<CAPTION>
                                                                DECEMBER 31,
                                                               ----------------
                                                                1997     1996
                                                               -------  -------
<S>                                                            <C>      <C>
Deferred tax assets arising from:
  Net operating loss carryforwards............................ $ 3,999  $ 2,938
  Closure and post-closure costs..............................     240      421
  Amortization of intangibles.................................   1,059      881
  Other.......................................................     561       26
                                                               -------  -------
Total deferred tax assets.....................................   5,859    4,266
Valuation allowance...........................................  (1,776)  (2,280)
                                                               -------  -------
Net deferred tax assets....................................... $ 4,083  $ 1,986
                                                               =======  =======
Deferred tax liabilities arising from:
  Property and equipment...................................... $ 4,414  $ 2,855
  Amortization of intangibles and landfill....................   1,184      472
  Other.......................................................     501       75
                                                               -------  -------
Total deferred tax liabilities................................ $ 6,099  $ 3,402
                                                               =======  =======
Net deferred tax liability.................................... $ 2,016  $ 1,416
                                                               =======  =======
</TABLE>
 
  At December 31, 1997, the Company had net operating loss (NOL) carryforwards
of approximately $10.5 million for federal income tax purposes that expire in
years 2006 to 2011. The utilization of the NOL carryforwards is limited by
future taxable earnings generated at the subsidiary level. The Company
recorded a valuation allowance to reflect uncertainty as to the utilization of
such NOL carryforwards for financial reporting purposes. The maximum annual
utilization of such NOL carryforwards are limited under the Internal Revenue
Code as a result of changes in ownership that have occurred.
 
  Significant components of income tax expense were as follows (in thousands):
 
<TABLE>
<CAPTION>
                                                      YEARS ENDED DECEMBER 31,
                                                      ---------------------------
                                                        1997     1996     1995
                                                      --------- -------- --------
   <S>                                                <C>       <C>      <C>
   Current:
     Federal......................................... $   2,793 $    99  $   141
     State...........................................       138     (30)     144
                                                      --------- -------  -------
                                                          2,931      69      285
   Deferred:
     Federal.........................................       553     146       38
     State...........................................        47      30        9
                                                      --------- -------  -------
                                                            600     176       47
                                                      --------- -------  -------
   Total provision................................... $   3,531 $   245  $   332
                                                      ========= =======  =======
</TABLE>
 
                                     F-14
<PAGE>
 
                       AMERICAN DISPOSAL SERVICES, INC.
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
6. INCOME TAXES--(CONTINUED)
 
 
  A reconciliation from the statutory income tax rate to the effective income
tax rate was as follows:
 
<TABLE>
<CAPTION>
                                                  YEARS ENDED DECEMBER 31,
                                                  --------------------------
                                                   1997     1996      1995
                                                  -------- -------- --------
   <S>                                            <C>      <C>      <C>
   Federal statutory income tax rate.............    35.0%    34.0%    (34.0)%
   Effect of:
     State taxes, net of federal tax effect......     1.1      --        3.1
     Nondeductible goodwill......................     1.9     15.5       --
     Net operating loss with no benefit..........     --       --       39.6
     Utilization of net operating loss
      carryforward...............................    (5.0)     --        --
     Other, net..................................    (0.5)     3.8       1.6
                                                  -------  -------  --------
   Effective tax rate............................    32.5%    53.3%     10.3 %
                                                  =======  =======  ========
</TABLE>
 
7. RELATED PARTY TRANSACTIONS
 
  The Company had entered into a management agreement with a stockholder for
certain services to be rendered to the Company in exchange for annual
management fees. The management agreement was terminated in connection with
the initial public offering during July 1996. Management fees of approximately
$466,000 and $659,000 were incurred in 1996 and 1995, respectively. At
December 31, 1995, the Company had a $12,500,000 unsecured note payable
outstanding to a stockholder, which was issued on November 16, 1995 and was
due November 16, 1996, bearing an annual interest rate of prime plus 3%. The
Company repaid the note payable to the stockholder in May 1996. Interest
expense relating to this note payable was approximately $621,000 and $180,000
in 1996 and 1995, respectively.
 
8. COMMITMENTS AND CONTINGENCIES
 
ENVIRONMENTAL AND REGULATORY REQUIREMENTS
 
  The business and activities of the Company are, and may become more,
extensively regulated by, among others, the federal Environmental Protection
Agency, the Department of Transportation, the Interstate Commerce Commission,
and various state and local environmental and transportation regulatory
authorities. The Company is subject to various statutes and regulations which
include, but are not limited to, the Resource Conservation and Recovery Act of
1976, the Federal Water Pollution Control Act, the Comprehensive Environmental
Response, Compensation and Liability Act of 1980, the Clean Air Act, and
numerous state and local laws and regulations. The full impact of these laws
and regulations and the possible adoption of new statutes and regulations with
respect to the Company's facilities and operations is uncertain and could have
material adverse effects on the Company's business, results of operations, and
financial condition in that the Company: (i) could be required to incur
additional expenses in compliance efforts, (ii) might be unable to comply,
forcing the Company to cease operations, and (iii) could incur additional
liability for past operation(s) of acquired assets. These regulations may also
impose restrictions on the Company's operations, such as limiting the
expansion of disposal facilities, limiting or banning the disposal of out-of-
state waste or certain other categories of waste, or mandating the disposal of
local refuse.
 
  Although the Company believes it is in substantial compliance with current
regulatory requirements, because of heightened political and public concern
over environmental issues, companies in the waste disposal industry, including
the Company, may become subject to judicial and administrative proceedings
involving federal, state, or local agencies in the normal course of business.
 
                                     F-15
<PAGE>
 
                       AMERICAN DISPOSAL SERVICES, INC.
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
8. COMMITMENTS AND CONTINGENCIES--(CONTINUED)
 
 
  The Company has obtained some levels of pollution liability insurance
covering certain claims for sudden or gradual onset environmental damage at
its landfill sites. The Company carries a comprehensive general liability
insurance policy which management considers adequate to protect its assets and
operations from other risks.
 
  The Company also may be subject to claims for personal injury or property
damage arising out of motor vehicle accidents involving its trucks. The
Company currently carries insurance with policy limits which management
believes to be sufficient to cover these risks. If the Company were to incur
liabilities outside of or in excess of its insurance limits, its financial
condition could be adversely affected.
 
  In connection with the Company's existing landfills, the Company has
obtained financial assurance bonds for approximately $26.9 million at December
31, 1997, from a financial institution to provide financial assurance that
closure and postclosure expenses will be met in the event that the Company is
not able to fulfill its closure and postclosure obligations.
 
CONTINGENT PAYMENTS RELATED TO ACQUISITIONS
 
  The Company has entered into certain acquisition agreements that include
consideration that is issuable upon the resolution of certain contingent
incentives available to the former owners of the acquired businesses. See Note
3 and Note 12 for further discussion.
 
FUTURE MINIMUM LEASE PAYMENTS
 
  At December 31, 1997, future minimum lease payments under noncancelable
lease obligations are as follows (in thousands):
 
<TABLE>
<CAPTION>
                                                               CAPITAL OPERATING
                                                               LEASES   LEASES
                                                               ------- ---------
<S>                                                            <C>     <C>
1998..........................................................  $224    $ 2,012
1999..........................................................   111      1,521
2000..........................................................    --      1,335
2001..........................................................    --      1,295
2002 and thereafter...........................................    --      6,262
                                                                ----    -------
Total minimum payments........................................   335    $12,425
                                                                        =======
Less: Amount representing interest............................    24
                                                                ----
Present value of net minimum lease payments...................  $311
                                                                ====
</TABLE>
 
  Rental expense in 1997, 1996, and 1995 was approximately $1.8 million, $1.3
million and $793,000, respectively.
 
9. RETIREMENT PLAN
 
  Effective January 1, 1996, the Company established a defined contribution
retirement savings plan covering substantially all employees of the Company.
Each participant may elect to defer a portion of annual compensation subject
to certain limitations. The Company matches up to 50% of the first $1,000 of
participant contributions to the plan. The Company's contributions for the
years ended December 31, 1997 and 1996 were approximately $129,000 and
$94,000, respectively.
 
                                     F-16
<PAGE>
 
                       AMERICAN DISPOSAL SERVICES, INC.
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
10. REDEEMABLE PREFERRED STOCK
 
 
  On March 28, 1995, the Company issued 1,950 of its Series A Preferred Stock
and 46,550 warrants to purchase shares of common stock of the Company, for
$1,950,000. The holder of the warrants had the right to purchase one common
share for each warrant held at the exercise price of $.10 per share on or
before December 31, 2002. The Company redeemed the outstanding preferred stock
in May 1996, and paid any accrued dividends related to the preferred stock.
The warrants were exercised in 1996.
 
11. STOCKHOLDERS' EQUITY
 
STOCK OPTIONS
 
  The Company's Board of Directors adopted the American Disposal Services,
Inc. 1996 Stock Option Plan effective January 1, 1996. The plan permits grants
of options up to an aggregate of 1,600,000 shares of common stock to employees
and certain consultants of the Company, on such terms as the Company's
compensation committee (or a stock option subcommittee thereof) determines.
During 1997, the Company's stockholders approved an increase in the aggregate
number of shares available for grant under the plan from 1,100,000 shares to
1,600,000 shares. Options granted under the plan as of January 1, 1996
replaced existing stock options granted by ADS and County in connection with
the Exchange. The stock options vest over three and five year periods and are
exercisable over a ten year period from the original grant dates. All vesting
is subject to acceleration under specified circumstances.
 
  Options to purchase an aggregate of 63,601 shares were granted outside the
plan to a former employee and were fully vested as of January 1, 1996. Such
shares have an exercise price of $7.17 per share, increasing at 25% per annum
from the date of original grant of the ADS stock options they replace.
 
  A summary of stock option information follows:
 
<TABLE>
<CAPTION>
                                 1997               1996              1995
                          ------------------- ----------------- ----------------
                                     WEIGHTED          WEIGHTED         WEIGHTED
                                     AVERAGE           AVERAGE          AVERAGE
                                     EXERCISE          EXERCISE         EXERCISE
                           OPTIONS    PRICE   OPTIONS   PRICE   OPTIONS  PRICE
                          ---------  -------- -------  -------- ------- --------
<S>                       <C>        <C>      <C>      <C>      <C>     <C>
Outstanding at beginning
 of year................    934,914   $ 7.47  869,617   $7.36   186,444  $7.17
  Granted...............    476,735    21.29   68,270    9.00   683,173   7.41
  Exercised.............    (49,793)   10.86     (467)   7.17         0    --
  Forfeited.............     (9,286)   12.98   (2,506)   7.64         0    --
                          ---------   ------  -------   -----   -------  -----
Outstanding at end of
 year...................  1,352,570   $12.58  934,914   $7.47   869,617  $7.36
                          =========   ======  =======   =====   =======  =====
Exercisable at end of
 year...................    620,585           434,553           105,223
Available future grant..    260,771           228,220           293,984
Weighted average value
 of options granted
 during the year........              $10.75            $4.33            $1.88
</TABLE>
 
  Options outstanding and exercisable as of December 31, 1997 by price range:
 
<TABLE>
<CAPTION>
                                         OUTSTANDING             EXERCISABLE
                                ------------------------------ ----------------
                                          WEIGHTED    WEIGHTED         WEIGHTED
                                           AVERAGE    AVERAGE          AVERAGE
                                          REMAINING   EXERCISE         EXERCISE
RANGE OF EXERCISE PRICES        SHARES  LIFE IN YEARS  PRICE   SHARES   PRICE
- ------------------------        ------- ------------- -------- ------- --------
<S>                             <C>     <C>           <C>      <C>     <C>
$ 7.17--$ 9.00................. 858,205      7.4       $ 7.48  596,653  $ 7.42
$17.25--$17.50................. 282,431      9.2       $17.36      --      --
$21.67--$29.63................. 211,934      9.2       $26.84   23,932  $22.97
</TABLE>
 
 
                                     F-17
<PAGE>
 
                       AMERICAN DISPOSAL SERVICES, INC.
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
11. STOCKHOLDERS' EQUITY--(CONTINUED)
 
  The Company has elected to follow APB 25 and related Interpretations in
accounting for its employee stock options because, as discussed below, the
alternative fair value accounting provided for under Statement of Financial
Accounting Standards No. 123, "Accounting for Stock-Based Compensation" (SFAS
123), requires use of option valuation models that were not developed for use
in valuing stock options. Under APB 25, because the exercise price of the
Company's employee stock options equals the market price of the underlying
stock on the date of grant, no compensation expense is recognized.
 
  Disclosure of pro forma information regarding net income (loss) and net
income (loss) per common share is required by SFAS 123, and has been
determined as if the Company had accounted for its stock options granted in
1997, 1996, and 1995 using SFAS 123. The options granted in 1997 and 1996 were
valued using the Black-Scholes option pricing model. The options granted in
1995, as a non-public company, were valued using the minimum value method. The
Black-Scholes option valuation model requires the input of highly subjective
assumptions and, because changes in the subjective input assumptions can
materially affect the fair value estimate, in management's opinion, the model
cannot necessarily provide a single measure of the fair value of its stock
options. The following assumptions were utilized in the valuation:
 
<TABLE>
<CAPTION>
                                                              DECEMBER 31,
                                                         -----------------------
                                                          1997    1996    1995
                                                         ------- ------- -------
   <S>                                                   <C>     <C>     <C>
   Risk-free interest rate..............................   6.31%   6.65%   5.85%
   Expected dividend yield..............................      0%      0%      0%
   Expected stock price volatility......................   48.9%   44.4%     n/a
   Expected life of options............................. 5 years 5 years 5 years
</TABLE>
 
  Had compensation cost for the Company' stock options granted in 1997 and
1996 been determined based on the fair value at the dates of grants, the
Company's net income (loss) and net income (loss) per common share would have
been as follows on a pro forma basis (in thousands, except per share data):
 
<TABLE>
<CAPTION>
                                                  YEARS ENDED DECEMBER 31,
                                                 ---------------------------
                                                   1997    1996      1995
                                                 -------- -------- ---------
   <S>                               <C>         <C>      <C>      <C>
   Net income (loss) applicable to
    common stockholders............. As reported $  7,341 $  (370) $  (3,743)
                                     Pro forma      5,998    (687)    (3,807)
   Basic earnings (loss) per common
    share........................... As reported     0.56   (0.05)     (1.12)
                                     Pro forma       0.46   (0.10)     (1.14)
   Diluted earnings (loss) per
    common share.................... As reported     0.53   (0.05)     (1.12)
                                     Pro forma       0.43   (0.09)     (1.14)
</TABLE>
 
  The pro forma effect for 1997, 1996, and 1995 is not representative of the
pro forma effect in future years as the pro forma disclosures reflect only the
fair value of stock options granted in 1997, 1996, and 1995 and do not reflect
the fair value of outstanding options granted prior to 1995.
 
STOCK WARRANTS
 
  In connection with obtaining various credit agreements, the Company issued
warrants to purchase 168,905 shares of common stock with exercise prices
ranging from $4.72 to $7.41 per share. The Company recorded the fair value of
the warrants as a component of equity and recognized debt issuance cost of
$106,666. The warrants expire 10 years from date of issuance. On November 13,
1997 warrant certificates representing 26,137 shares with an exercise price of
$7.17 per share and 45,193 shares with an exercise price of $4.72 per share
were exercised on a cashless basis. On January 9, 1998 warrant certificates
representing 48,787 shares with an exercise price of $7.41 per share were
exercised on a cashless basis.
 
                                     F-18
<PAGE>
 
                       AMERICAN DISPOSAL SERVICES, INC.
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
11. STOCKHOLDERS' EQUITY--(CONTINUED)
 
 
PREFERRED STOCK
 
  In connection with the Exchange, 5,000,000 shares of new preferred stock of
the Company were authorized with none issued at December 31, 1997 and 1996.
 
12. EARNINGS PER SHARE
 
  The following table sets forth the computation of earnings (loss) per common
share (in thousands, except per share data):
 
<TABLE>
<CAPTION>
                                                  YEARS ENDED DECEMBER 31,
                                               -------------------------------
                                                  1997      1996       1995
                                               ---------- ---------  ---------
<S>                                            <C>        <C>        <C>
Numerator:
  Net income (loss) applicable to common
   stockholders............................... $    7,341 $    (370) $  (3,743)
                                               ========== =========  =========
Denominator:
  Denominator for basic earnings per common
   share--weighted-average shares............. 13,177,346 7,063,928  3,340,512
  Effect of dilutive securities:
    Stock options and warrants................    644,991   401,122        --
                                               ---------- ---------  ---------
  Denominator for diluted earnings per common
   share--adjusted weighted-average shares and
   assumed conversions........................ 13,822,337 7,465,050  3,340,512
                                               ---------- ---------  ---------
    Basic earnings per common share........... $     0.56 $   (0.05) $   (1.12)
    Diluted earnings per common share.........       0.53     (0.05)     (1.12)
</TABLE>
 
  Options to purchase 171,500, 13,502, and 3,000 shares of common stock at
$27.13, $29.63, and $29.00, respectively, were outstanding during 1997, but
were not included in the computation of diluted earnings per common share
because the options' exercise price was greater than the average market price
of the common shares and, therefore, the effect would be antidilutive.
 
  Under one of the Company's acquisition agreements, if certain revenue goals
are met by the former owner of the acquired business, the Company is obligated
to deliver up to 115,000 additional shares of common stock to the former
owner. No portion of the 115,000 additional shares are included in the
computation of diluted earnings per common share in 1997 because none of the
revenue goals have been met as of December 31, 1997. Under another acquisition
agreement, if certain contracts are obtained or waste volume goals are met by
the former owner of the acquired business, the Company is obligated to deliver
additional shares of stock to the former owner. As the amount of shares are to
be determined using a future share price, it is not possible to estimate the
amount of shares that could be delivered by the Company. The value of
additional shares to be issued is not expected to exceed $12,500,000. No
additional shares are included in the computation of diluted earnings per
common share in 1997 because the contracts have not been obtained and waste
volume goals have not been met as of December 31, 1997.
 
  Subsequent to December 31, 1997, the Company has issued 1,304,444 additional
shares of common stock in conjunction with subsequent acquisitions and the
exercise of warrants and stock options.
 
13. SUBSEQUENT EVENTS
 
  Subsequent to December 31, 1997, the Company has acquired twelve solid waste
companies. On January 5, 1998, the Company acquired all of the outstanding
stock of R.C. Miller Enterprises, Inc. (R.C. Miller). The Company's
acquisition of R.C. Miller represents the substantial majority of the net
assets of companies acquired subsequent to December 31, 1997.
 
                                     F-19
<PAGE>
 
                       AMERICAN DISPOSAL SERVICES, INC.
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
14. QUARTERLY FINANCIAL DATA (UNAUDITED)
 
 
  Selected quarterly financial data for 1997 and 1996 is as follows (in
thousands, except per share data):
 
<TABLE>
<CAPTION>
                                     FIRST   SECOND    THIRD  FOURTH
                                    QUARTER  QUARTER  QUARTER QUARTER  TOTAL
                                    -------  -------  ------- ------- --------
               1997
               ----
<S>                                 <C>      <C>      <C>     <C>     <C>
Net sales.........................  $18,511  $27,763  $35,373 $39,716 $121,363
Gross profit......................    8,619   12,575   16,039  18,183   55,416
Net income........................      446    1,236    2,515   3,144    7,341
Basic earnings per common share...     0.05     0.11     0.18    0.17     0.56
Diluted earnings per common
 share............................     0.05     0.10     0.17    0.17     0.53
<CAPTION>
               1996
               ----
<S>                                 <C>      <C>      <C>     <C>     <C>
Net sales.........................  $11,724  $13,453  $15,122 $16,505 $ 56,804
Gross profit......................    5,616    6,391    7,022   7,399   26,428
Net income (loss) before
 extraordinary item...............     (479)    (199)     227     557      106
Net income (loss) applicable to
 common stockholders..............     (479)    (675)     227     557     (370)
Basic earnings (loss) per common
 share before extraordinary item..    (0.08)   (0.04)    0.03    0.06     0.02
Diluted earnings (loss) per common
 share before extraordinary item..    (0.08)   (0.04)    0.03    0.06     0.01
Basic and diluted earnings (loss)
 per common share.................    (0.08)   (0.12)    0.03    0.06    (0.05)
</TABLE>
 
 
Note:
   Earnings per common share have been restated to comply with SFAS No. 128.
   The earnings per common share computation for the year is a separate,
   annual calculation. Accordingly, the sum of the quarterly earnings per
   common share amounts do not necessarily equal the earnings per common
   share amounts for the year.
 
 
                                     F-20
<PAGE>
 
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
 
 NO DEALER, SALESPERSON OR ANY OTHER PERSON IS AUTHORIZED TO GIVE ANY INFORMA-
TION OR TO MAKE ANY REPRESENTATION IN CONNECTION WITH THIS OFFERING OTHER THAN
THOSE CONTAINED IN THIS PROSPECTUS, AND, IF GIVEN OR MADE, SUCH INFORMATION OR
REPRESENTATION MUST NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED BY THE COMPA-
NY, ANY SELLING STOCKHOLDER OR ANY UNDERWRITER. THIS PROSPECTUS DOES NOT CON-
STITUTE AN OFFER TO SELL OR A SOLICITATION OF AN OFFER TO BUY BY ANYONE IN ANY
JURISDICTION IN WHICH SUCH OFFER TO SELL OR SOLICITATION IS NOT AUTHORIZED, OR
IN WHICH THE PERSON MAKING SUCH OFFER IS NOT QUALIFIED TO DO SO OR TO ANY PER-
SON TO WHOM IT IS UNLAWFUL TO MAKE SUCH OFFER OR SOLICITATION. NEITHER THE DE-
LIVERY OF THIS PROSPECTUS NOR ANY SALE HEREUNDER SHALL, UNDER ANY CIRCUMSTANC-
ES, CREATE ANY IMPLICATION THAT THERE HAS BEEN NO CHANGE IN THE AFFAIRS OF THE
COMPANY SINCE THE DATE HEREOF OR THAT THE INFORMATION CONTAINED HEREIN IS COR-
RECT AS OF ANY TIME SUBSEQUENT TO ITS DATE.
 
                              -------------------
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                            PAGE
                                                                            ----
<S>                                                                         <C>
Prospectus Summary.........................................................   3
Risk Factors...............................................................   6
Use of Proceeds............................................................  13
Price Range of Common Stock................................................  13
Dividend Policy............................................................  13
Capitalization.............................................................  14
Selected Consolidated Financial Data.......................................  15
Management's Discussion and Analysis of
 Financial Condition and Results of Operations.............................  17
Business...................................................................  22
Management.................................................................  33
Principal and Selling Stockholders.........................................  35
Transfer Agent.............................................................  36
Shares Eligible for Future Sale............................................  36
Underwriting...............................................................  37
Legal Matters..............................................................  38
Experts....................................................................  38
Available Information......................................................  39
Incorporation of Certain Documents by Reference............................  39
Index to Financial Statements.............................................. F-1
</TABLE>
 
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
 
                               4,000,000 SHARES
 
 
                             [LOGO] AMERICAN
                                    DISPOSAL SERVICES, INC.
 
                                 COMMON STOCK
 
                              -------------------
 
                                  PROSPECTUS
 
                              -------------------
 
 
 
                               CIBC OPPENHEIMER
                         DONALDSON, LUFKIN & JENRETTE
                            SECURITIES CORPORATION
 
                                       , 1998
 
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
<PAGE>
 
              PART II INFORMATION NOT REQUIRED IN THE PROSPECTUS
 
ITEM 14. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.
 
  The following table shows the expenses, other than underwriting discounts,
which the Company expects to incur in connection with the issuance and
distribution of the securities being registered under this registration
statement. All expenses are estimated except for the Securities and Exchange
Commission registration fee and the NASD filing fee.
 
<TABLE>
   <S>                                                                 <C>
   Securities and Exchange Commission registration fee................ $ 47,665
   NASD filing fee....................................................   16,658
   Blue Sky fees and expenses.........................................   10,000
   Legal fees and expenses............................................  150,000
   Accounting fees and expenses.......................................  150,000
   Printing and engraving expenses....................................  120,000
   Miscellaneous......................................................    5,677
                                                                       --------
     Total............................................................ $500,000
                                                                       ========
</TABLE>
 
ITEM 15. INDEMNIFICATION OF DIRECTORS AND OFFICERS.
 
  Section 145 of the General Corporation Law of the State of Delaware
("Section 145") permits a Delaware corporation to indemnify any person who was
or is a party or is threatened to be made a party to any threatened, pending,
or completed action, suit, or proceeding, whether civil, criminal,
administrative, or investigative (other than an action by or in the right of
the corporation) by reason of the fact that he is or was a director, officer,
employee, or agent of the corporation, or is or was serving at the request of
the corporation as a director, officer, employee, or agent of another
corporation, partnership, joint venture, trust, or other enterprise, against
expenses (including attorneys' fees), judgments, fines, and amounts paid in
settlement actually and reasonably incurred by him in connection with such
action, suit, or proceeding if he acted in good faith and in a manner he
reasonably believed to be in or not opposed to the best interests of the
corporation, and, with respect to any criminal action or proceeding, had no
reasonable cause to believe his conduct was unlawful.
 
  In the case of an action by or in the right of the corporation, Section 145
permits the corporation to indemnify any person who was or is a party or is
threatened to be made a party to any threatened, pending, or completed action
or suit by or in the right of the corporation to procure a judgment in its
favor by reason of the fact that he is or was a director, officer, employee,
or agent of the corporation, or is or was serving at the request of the
corporation as a director, officer, employee, or agent of another corporation,
partnership, joint venture, trust, or other enterprise against expenses
(including attorneys' fees) actually and reasonably incurred by him in
connection with the defense or settlement of such action or suit if he acted
in good faith and in a manner he reasonably believed to be in or not opposed
to the best interests of the corporation. No indemnification may be made in
respect of any claim, issue, or matter as to which such person shall have been
adjudged to be liable to the corporation unless and only to the extent that
the Court of Chancery or the court in which such action or suit was brought
shall determine upon application that, despite the adjudication of liability
but in view of all the circumstances of the case, such person is fairly and
reasonably entitled to indemnity for such expenses which the Court of Chancery
or such other court shall deem proper.
 
  To the extent that a director, officer, employee, or agent of a corporation
has been successful on the merits or otherwise in defense of any action, suit,
or proceeding referred to in the preceding two paragraphs, Section 145
requires that he be indemnified against expenses (including attorneys' fees)
actually and reasonably incurred by him in connection therewith.
 
                                     II-1
<PAGE>
 
  Section 145 provides that expenses (including attorneys' fees) incurred by
an officer or director in defending any civil, criminal, administrative, or
investigative action, suit, or proceeding may be paid by the corporation in
advance of the final disposition of such action, suit, or proceeding upon
receipt of an undertaking by or on behalf of such director or officer to repay
such amount if it shall ultimately be determined that he is not entitled to be
indemnified by the corporation as authorized in Section 145.
 
  Article Fifth of the Company's Certificate of Incorporation eliminates the
personal liability of the directors of the Company to the Company or its
stockholders for monetary damages for breach of fiduciary duty as directors,
with certain exceptions, and Article Sixth requires indemnification of
directors and officers of the Company, and for advancement of litigation
expenses to the fullest extent permitted by Section 145. Article Sixth of the
Company's By-laws provides for indemnification of the Company's officers and
directors to the fullest extent permitted by Section 145 and other applicable
laws as currently in effect and as they may be amended in the future.
 
ITEM 16. EXHIBITS
 
<TABLE>
<CAPTION>
 EXHIBIT NO. DESCRIPTION OF EXHIBITS
 ----------- -----------------------
 <C>         <S>
     1.1     Underwriting Agreement
     4.1     Specimen Common Stock Certificate (1)
     5.1     Opinion of Proskauer Rose LLP
    23.1     Consent of Ernst & Young LLP
    23.2     Consent of Proskauer Rose LLP (included in exhibit 5.1)
    24.1     Powers of Attorney are set forth on the signature pages hereof
    27.1     Financial Data Schedule
</TABLE>
- --------
(1) Previously filed as an exhibit to the Company's Registration Statement on
    Form S-1 (333-4889).
 
ITEM 17. UNDERTAKINGS.
 
  (b) The undersigned registrant hereby undertakes that, for purposes of
determining any liability under the Securities Act of 1933, each filing of the
registrant's annual report pursuant to Section 13(a) or 15(d) of the
Securities Exchange Act of 1934 (and, where applicable, each filing of an
employee benefit plan's annual report pursuant to Section 15(d) of the
Securities Exchange Act of 1934) that is incorporated by reference in the
registration statement shall be deemed to be a new registration statement
relating to the securities offered therein, and the offering of such
securities at that time shall be deemed to be the initial bona fide offering
thereof.
 
  (h) Insofar as indemnification for liabilities arising under the Securities
Act of 1933 may be permitted to directors, officers, and controlling persons
of the Registrant pursuant to the provisions described above in Item 15 or
otherwise, the Registrant has been advised that in the opinion of the
Securities and Exchange Commission such indemnification is against public
policy as expressed in the Securities Act of 1933 and is, therefore,
unenforceable. In the event that a claim for indemnification against such
liabilities (other than the payment by the Registrant of expenses incurred or
paid by a director, officer, or controlling person of the Registrant in the
successful defense of any action, suit, or proceeding) is asserted against the
Registrant by such director, officer, or controlling person in connection with
the securities being registered, the Registrant will, unless in the opinion of
its counsel the matter has been settled by controlling precedent, submit to a
court of appropriate jurisdiction the question whether such indemnification by
it is against public policy as expressed in the Securities Act of 1933 and
will be governed by the final adjudication of such issue.
 
                                     II-2
<PAGE>
 
  (i) The undersigned registrant hereby undertakes that:
 
    (1) For purposes of determining any liability under the Securities Act of
  1933, the information omitted from the form of prospectus filed as part of
  this registration statement in reliance upon Rule 430A and contained in a
  form of prospectus filed by the registrant pursuant to Rule 424(b)(1) or
  (4) or 497(h) under the Securities Act shall be deemed to be part of this
  registration statement as of the time it was declared effective.
 
    (2) For the purpose of determining any liability under the Securities Act
  of 1933, each post-effective amendment that contains a form of prospectus
  shall be deemed to be a new registration statement relating to the
  securities offered therein, and the offering of such securities at that
  time shall be deemed to be the initial bona fide offering thereof.
 
                                     II-3
<PAGE>
 
                                  SIGNATURES
 
  PURSUANT TO THE REQUIREMENTS OF THE SECURITIES ACT OF 1933, AS AMENDED, THE
REGISTRANT HAS DULY CAUSED THIS REGISTRATION STATEMENT TO BE SIGNED ON ITS
BEHALF BY THE UNDERSIGNED, THEREUNTO DULY AUTHORIZED, IN THE CITY OF BURR
RIDGE, STATE OF ILLINOIS, ON MARCH 12, 1998.
 
                                          American Disposal Services, Inc.
 
                                                   /s/ Richard De Young
                                          By: _________________________________
                                                     RICHARD DE YOUNG
                                                         President
 
                               POWER OF ATTORNEY
 
  KNOW ALL PERSONS BY THESE PRESENTS, that the persons whose signatures appear
below each severally constitutes and appoints Richard De Young, Stephen P.
Lavey and Ann L. Straw, and each of them, as true and lawful attorneys-in-fact
and agents, with full power of substitution and resubstitution, for them in
their name, place and stead, in any and all capacities, to sign any and all
amendments (including pre-effective and post-effective amendments) to this
Registration Statement, and to file the same, with all exhibits thereto, and
other documents in connection therewith, with the Securities and Exchange
Commission, granting unto said attorneys-in-fact and agents, and each of them,
full power and authority to do and perform each and every act and thing
requisite and necessary to be done in and about the premises, as fully to all
intents and purposes as they might or could do in person, hereby ratifying and
confirming all which said attorneys-in-fact and agents, or any of them, or
their substitute or substitutes, may lawfully do, or cause to be done by
virtue hereof.
 
  Pursuant to the requirements of the Securities Act of 1933, this
Registrant's Registration Statement has been signed by the following persons
in the capacities and on the dates indicated.
 
              SIGNATURE                        TITLE                 DATE
 
        /s/ David C. Stoller           Chairman and             March 12, 1998
- -------------------------------------   Director
          DAVID C. STOLLER
 
        /s/ Richard De Young           President, Chief         March 12, 1998
- -------------------------------------   Executive Officer
          RICHARD DE YOUNG              and Director
 
        /s/ Stephen P. Lavey           Chief Financial          March 12, 1998
- -------------------------------------   Officer (principal
          STEPHEN P. LAVEY              financial officer)
 
    /s/ Lawrence R. Conrath, Sr.       Vice President and       March 12, 1998
- -------------------------------------   Controller
      LAWRENCE R. CONRATH, SR.          (principal
                                        accounting officer)
 
                                     II-4
<PAGE>
 
              SIGNATURE                         TITLE                DATE
 
        /s/ Merril M. Halpern           Director                March 12, 1998
- -------------------------------------
          MERRIL M. HALPERN
 
        /s/ A. Lawrence Fagan           Director                March 12, 1998
- -------------------------------------
          A. LAWRENCE FAGAN
 
     /s/ Richard T. Henshaw, III        Director                March 12, 1998
- -------------------------------------
       RICHARD T. HENSHAW, III
 
        /s/ G. T. Blankenship           Director                March 12, 1998
- -------------------------------------
          G. T. BLANKENSHIP
 
         /s/ Norman Steisel             Director                March 12, 1998
- -------------------------------------
           NORMAN STEISEL
 
 
                                      II-5

<PAGE>
 
                                                                     EXHIBIT 1.1

                                4,000,000 Shares

                        American Disposal Services, Inc.

                                  Common Stock

                             UNDERWRITING AGREEMENT
                             ----------------------



                                                                 _________, 1998



CIBC Oppenheimer Corp.
Donaldson, Lufkin & Jenrette Securities Corporation
c/o CIBC Oppenheimer Corp.
CIBC Oppenheimer Tower
World Financial Center
New York, New York  10281

On behalf of the Several
Underwriters named in
Schedule I attached hereto.

Gentlemen:

          American Disposal Services, Inc., a Delaware corporation (the
"Company"), and the stockholders named on Schedule II to this Agreement (the
"Selling Stockholders") propose to sell to you and the other underwriters named
in Schedule I to this Agreement (the "Underwriters"), for whom you are acting as
Representatives, an aggregate of 4,000,000 shares (the "Firm Shares") of the
Company's common stock, $0.01 par value (the "Common Stock"), of which 1,488,629
shares are to be issued and sold by the Company and 2,511,371 shares are to be
sold by the Selling Stockholders.  In addition, the Company proposes to grant to
the Underwriters an option to purchase up to an additional 600,000 shares (the
"Option Shares") of Common Stock from it, for the purpose of covering over-
allotments in connection with the sale of the Firm Shares.  The Firm Shares and
the Option Shares are together called the "Shares."
<PAGE>
 
          1.   Sale and Purchase of the Shares.  On the basis of the
               -------------------------------                      
representations, warranties and agreements contained in, and subject to the
terms and conditions of, this Agreement:

       (a) The Company and the Selling Stockholders agree, severally and not
     jointly, to sell to each of the Underwriters, and each of the Underwriters
     agrees, severally and not jointly, to purchase from the Company and the
     Selling Stockholders, at $___________ per share (the "Initial Price"), the
     number of Firm Shares set forth opposite the name of such Underwriter in
     Schedule I to this Agreement.

       (b) The Company grants to the several Underwriters an option to purchase,
     severally and not jointly, all or any part of the Option Shares at the
     Initial Price.  The number of Option Shares to be purchased by each
     Underwriter shall be the same percentage (adjusted by the Representatives
     to eliminate fractions) of the total number of Option Shares to be
     purchased by the Underwriters as such Underwriter is purchasing of the Firm
     Shares.  Such option may be exercised only to cover over-allotments in the
     sales of the Firm Shares by the Underwriters and may be exercised in whole
     or in part at any time on or before 12:00 noon, New York City time, on the
     business day before the Firm Shares Closing Date (as defined below), and
     only once thereafter within 30 days after the date of this Agreement, in
     each case upon written or telegraphic notice, or verbal or telephonic
     notice confirmed by written or telegraphic notice, by the Representatives
     to the Company no later than 12:00 noon, New York City time, on the
     business day before the Firm Shares Closing Date or at least two business
     days before the Option Shares Closing Date (as defined below), as the case
     may be, setting forth the number of Option Shares to be purchased and the
     time and date (if other than the Firm Shares Closing Date) of such
     purchase.

          2.     Delivery and Payment.  Delivery by the Company and the Selling
                 --------------------                                          
Stockholders of the Firm Shares to the Representatives for the respective
accounts of the Underwriters, and payment of the purchase price by certified or
official bank check or checks payable in New York Clearing House (same day)
funds to the Company and the Selling Stockholders, shall take place at the
offices of CIBC Oppenheimer Corp., at CIBC Oppenheimer Tower, World Financial
Center, New York, New York 10281, at 10:00 a.m., New York City time, on the
third business day following the date of this Agreement, provided, however, that
if the Shares sold hereunder are priced after 4:30 p.m., New York time, on any
business day, payment and delivery in respect of the Firm Shares shall take
place on the fourth business day following the date of this Agreement; if it is
determined that settlement within the foregoing time frame is not feasible, then
payment and delivery in respect of the Firm Shares shall occur at such time on
such other date, not later than 10 business days after the date of this
Agreement, as shall be agreed upon by the Company and the Representatives (such
time and date of delivery and payment are called the "Firm Shares Closing
Date").

                                     - 2 -
<PAGE>
 
          In the event the option with respect to the Option Shares is
exercised, delivery by the Company of the Option Shares to the Representatives
for the respective accounts of the Underwriters and payment of the purchase
price by certified or official bank check or checks payable in New York Clearing
House (same day) funds to the Company shall take place at the offices of CIBC
Oppenheimer Corp. specified above at the time and on the date (which may be the
same date as, but in no event shall be earlier than, the Firm Shares Closing
Date) specified in the notice referred to in Section 1(b) (such time and date of
delivery and payment are called the "Option Shares Closing Date").  The Firm
Shares Closing Date and the Option Shares Closing Date are called, individually,
a "Closing Date" and, together, the "Closing Dates."

          Certificates evidencing the Shares shall be registered in such names
and shall be in such denominations as the Representatives shall request at least
two full business days before the Firm Shares Closing Date or, in the case of
Option Shares, on the day of notice of exercise of the option as described in
Section l(b) and shall be made available to the Representatives for checking and
packaging, at such place as is designated by the Representatives, at least one
full business day before the Firm Shares Closing Date (or the Option Shares
Closing Date in the case of the Option Shares).

          3.     Registration Statement and Prospectus; Public Offering.  The
                 ------------------------------------------------------      
Company has prepared in conformity with the requirements of the Securities Act
of 1933, as amended (the "Securities Act"), and the published rules and
regulations thereunder (the "Rules") adopted by the Securities and Exchange
Commission (the "Commission") a registration statement on Form S-3 (No. 333-
_______), including a preliminary prospectus relating to the Shares, and has
filed with the Commission the registration statement and such amendments thereto
as may have been required to the date of this Agreement.  Copies of such
Registration Statement (including all amendments thereto) and of the related
preliminary prospectus have heretofore been delivered by the Company to you.
The Company may also file a related registration statement with the Commission
pursuant to Rule 462(b) under the Securities Act for the purpose of registering
additional Shares, which registration shall be effective upon filing with the
Commission.  The term "Registration Statement" means the Registration Statement
as amended at the time and on the date it becomes effective (the "Effective
Date"), including all exhibits and information, if any, deemed to be part of the
Registration Statement pursuant to Rule 424(a), Rule 430A and Rule 462(b) of the
Rules.  The term "preliminary prospectus" means any preliminary prospectus (as
described in Rule 430 of the Rules) included at any time as a part of the
Registration Statement.  The term "Prospectus" means the prospectus in the form
first used to confirm sales of the Shares (whether such prospectus was included
in the Registration Statement at the time of effectiveness or was subsequently
filed with the Commission pursuant to Rule 424(b) of the Rules) or the
preliminary prospectus forming part of the Registration Statement at the time it
was declared effective together with the term sheet permitted under Rule 434(b)
and filed with the Commission pursuant to Rule 424(b), as applicable.

          The Company and the Selling Stockholders understand that the
Underwriters propose to make a public offering of the Shares, as set forth in
and pursuant to the Prospectus, as soon after the Effective Date and the date of
this Agreement as the Representatives deem advisable.  The

                                     - 3 -
<PAGE>
 
Company and the Selling Stockholders hereby confirm that the Underwriters and
dealers have been authorized to distribute or cause to be distributed each
preliminary prospectus and are authorized to distribute the Prospectus (as from
time to time amended or supplemented if the Company furnishes amendments or
supplements thereto to the Underwriters).

            4.   Representations and Warranties of the Company and the Selling
                 -------------------------------------------------------------
Stockholders.
- ------------ 

            (A)  The Company hereby represents and warrants to each Underwriter
as follows:

       (a) On the Effective Date the Registration Statement complied, and on the
     date of the Prospectus, on the date any post-effective amendment to the
     Registration Statement or any related registration statement filed with the
     Commission pursuant to Rule 462(b) of the Rules shall become effective, on
     the date any supplement or amendment to the Prospectus is filed with the
     Commission and on each Closing Date, the Registration Statement and the
     Prospectus (and any amendment thereof or supplement thereto) will comply in
     all material respects with the applicable provisions of the Securities Act
     and the Rules and the Securities Exchange Act of 1934, as amended (the
     "Exchange Act") and the rules and regulations of the Commission thereunder;
     the Registration Statement did not, as of the Effective Date, 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 not misleading; and on the other dates referred to above neither
     the Registration Statement nor the Prospectus, nor any amendment thereof or
     supplement thereto, will contain any untrue statement of a material fact or
     will omit to state any material fact required to be stated therein or
     necessary in order to make the statements therein not misleading.  When any
     related preliminary prospectus was first filed with the Commission (whether
     filed as part of the Registration Statement or any amendment thereto or
     pursuant to Rule 424(a) of the Rules) and when any amendment thereof or
     supplement thereto was first filed with the Commission, such preliminary
     prospectus as amended or supplemented complied in all material respects
     with the applicable provisions of the Securities Act and the Rules and did
     not 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 not misleading.  The Company makes no representation
     or warranty as to any information contained in or omitted from (i) the
     paragraphs with respect to stabilization or affiliate transactions on the
     inside front cover page of the Prospectus and (ii) the statements contained
     under the caption "Underwriting" in the Prospectus.  The Company and the
     Selling Stockholders acknowledge that such statements constitute the only
     information furnished in writing by the Representatives on behalf of the
     several Underwriters specifically for inclusion in the Registration
     Statement, any preliminary prospectus or the Prospectus.

                                     - 4 -
<PAGE>
 
       (b) All contracts and other documents required to be filed as exhibits to
     the Registration Statement have been filed with the Commission as exhibits
     to the Registration Statement.

       (c) The financial statements of the Company (including all notes thereto)
     included in the Registration Statement and Prospectus fairly present the
     financial position, the results of operations, stockholders' equity and
     cash flows and the other information purported to be shown therein of the
     Company at the respective dates and for the respective periods to which
     they apply; and such financial statements have been prepared in conformity
     with generally accepted accounting principles, consistently applied
     throughout the periods involved, and all adjustments necessary for a fair
     presentation of the results for such periods have been made.  There are no
     schedules required to be included in the Registration Statement in order to
     present fairly in all material respects the information required to be
     stated therein; and the historical financial information and statistical
     data set forth in the Prospectus under the captions "Summary Consolidated
     Financial Information," "Capitalization" and "Selected Consolidated
     Financial Data" are fairly stated in all material respects in relation to
     the financial statements from which they have been derived.

       (d) Ernst & Young LLP, whose reports are filed with the Commission as a
     part of the Registration Statement, is and, during the periods covered by
     its reports, was an independent public accountant as required by the
     Securities Act and the Rules.

       (e) The Company has been duly organized and is validly existing as a
     corporation in good standing under the laws of the State of Delaware.  Each
     subsidiary of the Company has been duly incorporated or formed and is an
     existing corporation in good standing under the laws of the jurisdiction of
     its incorporation or organization.  The Company has no subsidiary or
     subsidiaries other than as set forth on Schedule III hereto (collectively,
     the "Subsidiaries") and does not control, directly or indirectly, any other
     corporation, partnership, joint venture, association or other business
     organization.  Each of the Company and its subsidiaries is duly qualified
     and in good standing as a foreign corporation in each jurisdiction in which
     the character or location of its assets or properties (owned, leased or
     licensed) or the nature of its business makes such qualification necessary,
     except for such jurisdictions where the failure to so qualify individually
     or in the aggregate would not have a material adverse effect on the assets
     or properties, business, results of operations or financial condition of
     the Company and its subsidiaries, taken as a whole, and the Company has not
     received any claim or notice from any official authority in any
     jurisdiction that it is required to be qualified or licensed to do business
     in any such jurisdiction in which it is not so qualified or licensed.
     Except as disclosed in the Registration Statement and the Prospectus, the
     Company and its subsidiaries do not own, lease or license any asset or
     property or conduct any business outside the United States of America.
     Each of the Company and its subsidiaries has all requisite corporate power
     and authority, and all necessary authorizations, approvals,

                                     - 5 -
<PAGE>
 
     consents, orders, licenses, certificates and permits of and from all
     governmental or regulatory bodies or any other person or entity, to own,
     lease and license its assets and properties and conduct its businesses as
     now being conducted and as described in the Registration Statement and the
     Prospectus, except for such authorizations, approvals, consents, orders,
     licenses, certificates and permits which, if not obtained, would not have a
     material adverse effect on the assets or properties, business, results of
     operations or financial condition of the Company and its subsidiaries,
     taken as a whole; no such authorization, approval, consent, order, license,
     certificate or permit contains a materially burdensome restriction other
     than as disclosed in the Registration Statement and the Prospectus; and the
     Company has all such corporate power and authority, and such
     authorizations, approvals, consents, orders, licenses, certificates and
     permits to enter into, deliver and perform this Agreement and to issue and
     sell the Shares (except as may be required under the Securities Act, the
     Exchange Act and state and foreign Blue Sky laws).

       (f) Except as disclosed in the Registration Statement and the Prospectus,
     the Company owns or possesses adequate and enforceable rights to use all
     (to the extent any of them exist) patents, patent applications, trademarks,
     trademark applications, service marks, copyrights, copyright applications,
     licenses and other similar rights (collectively, the "Intangibles")
     necessary for the conduct of its business as now being conducted and as
     described in the Registration Statement and the Prospectus.  The Company
     has not infringed, is not infringing, and has not received any notice of
     infringement of, any Intangible of any other person and the Company does
     not know of any basis therefor except for such infringements which
     individually or in the aggregate would not have a material adverse effect
     on the assets or properties, business, results of operations or financial
     condition of the Company and its subsidiaries, taken as a whole.  The
     Company has not received any notice of infringement of any of its
     Intangibles and the Company does not know of any basis therefor.

       (g) Each of the Company and its subsidiaries has good and marketable
     title in fee simple to each of the items of personal property which are
     reflected in the financial statements referred to in Section 4(A)(c) or are
     referred to in the Registration Statement and the Prospectus as being owned
     by it and valid and enforceable leasehold interests in each of the items of
     real and personal property which are referred to in the Registration
     Statement and the Prospectus as being leased by it, in each case free and
     clear of all liens, encumbrances, claims, security interests and defects,
     other than those described in the Registration Statement and the Prospectus
     and other than those that could not materially affect the value thereof or
     materially interfere with the use made or presently contemplated to be made
     thereof by them.

       (h) Except as disclosed in the Registration Statement and the Prospectus,
     there is no litigation or governmental or other proceeding or investigation
     before any court or before or by any public body or board pending or, to
     the best of the Company's knowledge, threatened (and the Company does not
     know of any basis therefor) against,

                                     - 6 -
<PAGE>
 
     or involving the assets, properties or businesses of, the Company or any of
     its subsidiaries which, if determined adversely to the Company or any of
     its subsidiaries, would materially adversely affect the value or the
     operation of any such assets or properties or the business, results of
     operations or financial condition of the Company and its subsidiaries,
     taken as a whole, or would materially and adversely affect the ability of
     the Company to perform its obligations under this Agreement.

       (i) Subsequent to the respective dates as of which information is given
     in the Registration Statement and the Prospectus, except as described
     therein, there has not been any material adverse change in the assets or
     properties, business, results of operations or financial condition of the
     Company and its subsidiaries, taken as a whole, whether or not arising from
     transactions in the ordinary course of business; each of the Company and
     its subsidiaries has not entered into any transaction, other than in the
     ordinary course of business, that is material to the Company and its
     subsidiaries, taken as a whole; each of the Company and its subsidiaries
     has not sustained any material loss or interference with its assets,
     businesses or properties from fire, explosion, earthquake, flood or other
     calamity, whether or not covered by insurance, or from any labor dispute or
     any court or legislative or other governmental action, order or decree.
     Since the date of the latest balance sheet included in the Registration
     Statement and the Prospectus, except as reflected in the Registration
     Statement and the Prospectus, each of the Company and its subsidiaries has
     not undertaken any liability or obligation, direct or contingent, except
     for liabilities or obligations undertaken in the ordinary course of
     business.

       (j) Each agreement listed in the Exhibits to the Registration Statement
     is in full force and effect and is valid and enforceable by the Company or
     one of its subsidiaries in accordance with its terms, except where the
     failure of any such agreement to be in full force and effect and valid and
     enforceable by the Company or one of its subsidiaries in accordance with
     its terms would not have a material adverse effect on the assets or
     properties, business, results of operations or financial condition of the
     Company and its subsidiaries, taken as a whole, assuming the due
     authorization, execution and delivery thereof by each of the other parties
     thereto.  Neither the Company, nor to the best of the Company's knowledge,
     any other party is in default in the observance or performance of any term
     or obligation to be performed by it under any such agreement, and no event
     has occurred which with notice or lapse of time or both would constitute
     such a default which default or event would have a material adverse effect
     on the assets or properties, business, results of operations or financial
     condition of the Company and its subsidiaries, taken as a whole.  No
     default exists, and no event has occurred which with notice or lapse of
     time or both would constitute a default, in the due performance and
     observance of any term, covenant or condition, by the Company of any other
     indenture, mortgage, deed of trust, note or any other agreement or
     instrument to which the Company or any of its subsidiaries is a party or by
     which any of them or their properties or businesses is bound or affected
     which default or event would have a material adverse effect on the assets
     or properties,

                                     - 7 -
<PAGE>
 
     business, results of operations or financial condition of the Company and
     its subsidiaries, taken as a whole.

       (k) Each of the Company and its subsidiaries is not in violation of any
     term or provision of its charter or by-laws or of any franchise, license,
     permit, judgment, decree, order, statute, rule or regulation, where the
     consequences of such violation would have a material adverse effect on the
     assets or properties, business, results of operations or financial
     condition of the Company.

       (l) Neither the execution, delivery and performance of this Agreement by
     the Company nor the consummation of any of the transactions contemplated
     hereby or thereby (including, without limitation, the issuance and sale by
     the Company of the Shares) will (i) give rise to a right to terminate or
     accelerate the due date of any payment due under, or conflict with or
     result in the breach of any term or provision of, or constitute a default
     (or any event which with notice or lapse of time or both would constitute a
     default) under, or require any consent or waiver under, or result in the
     execution or imposition of any lien, charge or encumbrance upon any
     properties or assets of the Company or any of its subsidiaries pursuant to
     the terms of, any indenture, mortgage, deed of trust, note or other
     agreement or instrument to which the Company or any of its subsidiaries, is
     a party or by which any of them or their properties or businesses is bound,
     or any franchise, license, permit, judgment, decree, order, statute, rule
     or regulation applicable to the Company or any of its subsidiaries, except
     for such terminations, accelerations, conflicts, breaches, defaults and
     events which would not, individually or in the aggregate, result in a
     material adverse effect on the assets or properties, business, results of
     operations or financial condition of the Company and its subsidiaries,
     taken as a whole, or (ii) violate any provision of the charter or by-laws
     of the Company or any of its subsidiaries.

       (m) The Company has 60,000,000 authorized shares of Common Stock,
     21,116,173 of which are issued and outstanding.  As of December 31, 1997,
     the Company had an authorized and outstanding capitalization as set forth
     under the caption "Capitalization" in the Prospectus.  All of the
     outstanding shares of Common Stock have been duly and validly authorized
     and have been duly and validly issued and are fully paid and nonassessable
     and none of them was issued in violation of any preemptive or other similar
     statutory right.  The Shares, when issued and sold pursuant to this
     Agreement, will be duly and validly issued, fully paid and nonassessable
     and none of them will be issued in violation of any preemptive or other
     similar statutory right.  Except as disclosed in the Registration Statement
     and the Prospectus, there is no outstanding option, warrant or other right
     calling for the issuance of, and no commitment, plan or agreement to issue,
     any share of stock of the Company or any security convertible into, or
     exercisable or exchangeable for, stock of the Company.  The Common Stock
     and the undesignated preferred stock, $0.01 par value (the "Preferred
     Stock") and the Shares conform to all

                                     - 8 -
<PAGE>
 
     statements in relation thereto contained in the Registration Statement and
     the Prospectus. No shares of Preferred Stock are issued and outstanding.

       (n) Subsequent to the respective dates as of which information is given
     in the Registration Statement and the Prospectus, except as described or
     referred to therein, the Company has not (i) issued any securities or
     incurred any liability or obligation, direct or contingent, for borrowed
     money, (ii) entered into any transaction not in the ordinary course of
     business or (iii) declared or paid any dividend or made any distribution on
     any shares of its stock or redeemed, purchased or otherwise acquired or
     agreed to redeem, purchase or otherwise acquire any shares of its stock.

       (o) No holder of any security of the Company has any right to have any
     security owned by such holder included in the Registration Statement (not
     heretofore waived).  The Company has obtained from all officers and
     directors of the Company who together, following the Offering, will
     beneficially hold an aggregate of __________ shares of Common Stock or
     options and warrants to purchase Common Stock, their enforceable written
     agreement that for a period of at least 90 days from the date of this
     Agreement they will not, without the prior written consent of the
     Representatives, sell, offer to sell, distribute, pledge, grant any option
     for the sale of, or otherwise dispose of, directly or indirectly, or
     encumber, or exercise any registration rights with respect to, any shares
     of Common Stock, any options or warrants to purchase any shares of Common
     Stock, or any securities convertible into or exchangeable for shares of
     Common Stock now owned by them or hereafter acquired or with respect to
     which they have or hereafter acquire the power of disposition.

       (p) All necessary corporate action has been duly and validly taken by the
     Company to authorize the execution, delivery and performance of this
     Agreement and the issuance and sale of the Shares.  This Agreement has been
     duly and validly executed and delivered by the Company and constitutes and
     will constitute the legal, valid and binding obligation of the Company
     enforceable against the Company in accordance with its terms, except (A) as
     the enforceability thereof may be limited by bankruptcy, insolvency,
     fraudulent transfer, fraudulent conveyance, reorganization, moratorium or
     other similar laws affecting the enforcement of creditors' rights generally
     and by general equitable principles (whether considered in proceedings in
     equity or at law) and (B) with respect to this Agreement, to the extent
     that rights to indemnity or contribution under this Agreement may be
     limited by federal, state or foreign securities laws or the public policy
     underlying such laws.

       (q) Each of the Company and its subsidiaries is conducting its business
     in compliance with all applicable laws, rules and regulations of the
     jurisdictions in which it is conducting business, including, without
     limitation, all applicable local, state and federal environmental laws and
     regulations, except where the failure to be so in compliance would not have
     a material adverse effect on the assets or properties, business,

                                     - 9 -
<PAGE>
 
     results of operations or financial condition of the Company and its
     subsidiaries, taken as a whole.

       (r) No transaction has occurred between or among the Company and any of
     its officers or directors or any affiliate or affiliates of any such
     officer or director that is required to be described in and is not
     described in the Registration Statement and the Prospectus.

       (s) The Company has not taken, nor will it take, directly or indirectly,
     any action designed to or which might reasonably be expected to cause or
     result in, or which has constituted or which might reasonably be expected
     to constitute, the stabilization or manipulation of the price of the Common
     Stock to facilitate the sale or resale of any of the Shares.

       (t) The Company has filed all federal, state, local and foreign tax
     returns which are required to be filed through the date hereof, or has
     received extensions thereof, and has paid all taxes shown on such returns
     and all assessments received by it, except where the failure to file,
     extend the due date of or pay the same, individually or in the aggregate
     would not have a material adverse effect on the assets or properties,
     business, results of operations or financial condition of the Company and
     its subsidiaries, taken as a whole.

       (u) The Shares have been approved for quotation on the National
     Association of Securities Dealers Automated Quotation ("Nasdaq") National
     Market, subject to official notice of issuance.

       (B) Each Selling Stockholder, severally and not jointly, represents and
warrants as to such Selling Stockholder to each Underwriter that:

       (a) This Agreement, and such Selling Stockholder's Custody Agreement and
     power of attorney (the "Custody Agreement" and "Power of Attorney") among
     such Selling Stockholder, Richard De Young, Stephen P. Lavey and Ann L.
     Straw, as attorneys-in-fact, and American Disposal Services, Inc., as
     custodian, have been duly and validly executed and delivered by such
     Selling Stockholder and constitutes and will constitute the legal, valid
     and binding obligation of such Selling Stockholder, enforceable against
     such Selling Stockholder in accordance with its terms, except (i) as the
     enforceability hereof and thereof may be limited by bankruptcy, insolvency,
     moratorium or other similar laws affecting the enforcement of creditors'
     rights generally and by general equitable principles and (ii) to the extent
     that rights to indemnity or contribution under this Agreement may be
     limited by federal and state securities laws or the public policy
     underlying such laws.

                                     - 10 -
<PAGE>
 
       (b) Such Selling Stockholder has good, valid and marketable title to the
     Shares to be sold by such Selling Stockholder pursuant to this Agreement,
     free and clear of all liens, encumbrances, security interests, restrictions
     or claims whatsoever, with the legal right and full power to enter into
     this Agreement and to sell, transfer and deliver such Shares hereunder and,
     upon the delivery of and payment for such Shares as contemplated hereby,
     such Selling Stockholder will convey to the Underwriters good, valid and
     marketable title to the Shares being sold by such Selling Stockholder, free
     and clear of all liens, encumbrances, security interests, restrictions or
     claims whatsoever.

       (c) All information with respect to such Selling Stockholder furnished by
     or on behalf of such Selling Stockholder for use in connection with the
     preparation of the Registration Statement and Prospectus is true and
     correct in all material respects and does not omit to state any material
     fact necessary to make such information not misleading.

       (d) No transaction has occurred between such Selling Stockholder and the
     Company or any of its subsidiaries that is required to be described in and
     is not described in the Registration Statement and the Prospectus.

       (e) Such Selling Stockholder has not taken and will not take, directly or
     indirectly, any action designed to or which might reasonably be expected to
     cause or result in, or which has constituted or which will reasonably be
     expected to constitute, stabilization or manipulation of the price of the
     Common Stock to facilitate the sale or resale of any of the Shares.

       (f) Such Selling Shareholder hereby repeats and confirms as if set forth
     in full herein each of the representations, warranties and agreements made
     by such Selling Shareholder in the Custody Agreement and Power of Attorney
     and agrees that such representations, warranties and agreements are made
     hereby for the benefit of, and may be relied upon by, (i) the
     Representatives, the Underwriters and Morgan, Lewis & Bockius LLP, counsel
     to the Underwriters, (ii) the Company and Proskauer Rose LLP, counsel to
     the Company, and (iii) each other Selling Stockholder.

          5.     Conditions of the Underwriters' Obligations.  The obligations
                 -------------------------------------------                  
of the Underwriters under this Agreement are several and not joint.  The
respective obligations of the Underwriters to purchase the Shares are subject to
each of the following terms and conditions:

       (a) The Prospectus shall have been timely filed with the Commission in
     accordance with Section 6(A)(a).

       (b) No order preventing or suspending the use of any preliminary
     prospectus or the Prospectus shall have been or shall be in effect, and no
     order suspending the effectiveness of the Registration Statement shall be
     in effect and no proceedings for such purpose shall be pending before or
     threatened by the Commission, and any requests for

                                     - 11 -
<PAGE>
 
     additional information on the part of the Commission (to be included in the
     Registration Statement or the Prospectus or otherwise) shall have been
     complied with to the satisfaction of the Representatives.

       (c) The representations and warranties of the Company and the Selling
     Stockholders contained in this Agreement and in the certificates delivered
     pursuant to Section 5(d) and 5(e) shall be true and correct when made and
     on and as of each Closing Date as if made on such date and the Company and
     the Selling Stockholders shall have performed all covenants and agreements
     and satisfied all the conditions contained in this Agreement required to be
     performed or satisfied by it or them at or before such Closing Date.

       (d) The Representatives shall have received on each Closing Date a
     certificate, addressed to the Representatives and dated such Closing Date,
     of the chief executive or chief operating officer and the chief financial
     officer or chief accounting officer of the Company, to the effect that the
     signers of such certificate have carefully examined the Registration
     Statement, the Prospectus and this Agreement and that the representations
     and warranties of the Company in this Agreement are true and correct on and
     as of such Closing Date with the same effect as if made on such Closing
     Date and the Company has performed all covenants and agreements and
     satisfied all conditions contained in this Agreement required to be
     performed or satisfied by it at or prior to such Closing Date.

       (e) The Representatives shall have received on each Closing Date a
     certificate, addressed to the Representatives and dated such Closing Date,
     of each Selling Stockholder (or a responsible officer thereof) to the
     effect that the representations and warranties of such Selling Stockholder
     in this Agreement are true and correct on and as of such Closing Date with
     the same effect as if made on such Closing Date and such Selling
     Stockholder has performed all covenants and agreements and satisfied all
     conditions contained in this Agreement required to be performed or
     satisfied by such Selling Stockholder at or prior to such Closing Date.

       (f)  The Representatives shall have received at the time this Agreement
     is executed and on each Closing Date a letter or letters signed by Ernst &
     Young LLP, addressed to the Representatives and dated, respectively, the
     date of this Agreement and each such Closing Date, in form and substance
     satisfactory to the Representatives, confirming that they are independent
     accountants within the meaning of the Securities Act and the Rules, that
     the response to Item 10 of the Registration Statement is correct insofar as
     it relates to them and stating in effect that:

            (i)  in their opinion the audited financial statements and financial
          statement schedules, if any, included in the Registration Statement
          and the Prospectus and reported on by them comply as to form in all
          material respects with the applicable accounting requirements of the
          Securities Act and the Rules;

                                     - 12 -
<PAGE>
 
            (ii)  on the basis of a reading of the amounts included in the
          Registration Statement and the Prospectus under the headings "Summary
          Consolidated Financial Information" and  "Selected Consolidated
          Financial Data"; a reading of the minutes of the meetings of the
          stockholders and directors and finance and audit committees of the
          Company; and inquiries of certain officials of the Company who have
          responsibility for financial and accounting matters of the Company as
          to transactions and events subsequent to the date of the latest
          audited financial statements, nothing came to their attention which
          caused them to believe that:

                 (A)  the amounts in "Summary Consolidated Financial
               Information" and "Selected Consolidated Financial Data" included
               in the Registration Statement and the Prospectus do not agree
               with the corresponding amounts in the audited financial
               statements from which such amounts were derived; or

                 (B)  the audited financial statements as of and for the three
               years ended December 31, 1997 included in the Registration
               Statement (i) do not comply in form in all material respects with
               the applicable accounting requirements of the Securities Act and
               the Rules and (ii) are not in conformity with generally accepted
               accounting principles applied on a basis substantially consistent
               with that of the audited financial statements; or

                 (C)  (i) with respect to the Company there were, at a specified
               date not more than five business days prior to the date of the
               letter, any increases in the total current liabilities and long-
               term debt of the Company or capital stock of the Company or
               decreases in working capital (deficit) or total stockholders'
               equity (deficit) of the Company, as compared with the amounts
               shown on the Company's audited December 31, 1997 balance sheet
               included in the Registration Statement and the Prospectus, or
               (ii) for the period from December 31, 1997 to such specified date
               not more than five business days prior to the date of the letter,
               there were any increases in net losses except for increases in
               net losses set forth in the Registration Statement and the
               Prospectus, in which case the Company shall deliver to the
               Representatives a letter containing an explanation by the Company
               as to the significance thereof unless said explanation is not
               deemed necessary by the Representatives; and

            (iii)  they have performed certain other procedures as a result of
          which they determined that certain information of an accounting,
          financial or statistical nature (which is limited to accounting,
          financial or statistical information derived from the general
          accounting records of the Company) set forth in the Registration

                                     - 13 -
<PAGE>
 
          Statement and the Prospectus and specified by the Representatives
          agrees with the accounting records of the Company.

     References to the Registration Statement and the Prospectus in this
     paragraph (f) are to such documents as amended and supplemented at the date
     of the letter.

       (g)  [Intentionally omitted]

       (h) The Representatives shall have received on each Closing Date from
     Proskauer Rose LLP, counsel for the Company, an opinion, addressed to the
     Representatives and dated such Closing Date, and stating in effect that:

            (i)  The Company has been duly organized and is validly existing as
          a corporation in good standing under the laws of the State of
          Delaware.  Each Subsidiary of the Company set forth on Schedule III
          hereto has been duly incorporated or formed and is an existing
          corporation in good standing under the laws of the jurisdiction of its
          incorporation or organization.

            (ii)  Each of the Company and the Subsidiaries set forth on Schedule
          III hereto has all requisite corporate power and authority to own,
          lease and license its assets and properties and conduct its business
          as now being conducted and as described in the Registration Statement
          and the Prospectus; and the Company has all requisite corporate power
          and authority and all necessary governmental authorizations,
          approvals, consents, orders, licenses, certificates and permits
          required pursuant to New York State law, federal law and the General
          Corporation Law of the State of Delaware or known to such counsel to
          be required under the laws of other jurisdictions, and all other
          necessary authorizations, approvals, consents, orders, licenses,
          certificates and permits either called for by any contracts or other
          documents of which such counsel has knowledge or which are, to such
          counsel's knowledge, otherwise required, to enter into, deliver and
          perform this Agreement and to issue and sell the Shares, other than
          those required under the Securities Act, the Exchange Act and state
          and foreign Blue Sky laws.

            (iii)  The Company has 60,000,000 authorized shares of Common Stock,
          21,116,173 of which are issued and outstanding of record after giving
          effect to the transactions contemplated by this Agreement; no shares
          of Preferred Stock are issued and outstanding; as of __________ , the
          Company had an authorized and outstanding capitalization of record as
          set forth under the caption "Capitalization" in the Prospectus; the
          certificates evidencing the Shares are in due and proper legal form
          and have been duly authorized for issuance by the Company; all of the
          outstanding shares of Common Stock of the Company have been duly and
          validly authorized and have been duly and validly issued and are fully
          paid and nonassessable and none of them was issued in violation of any
          preemptive or

                                     - 14 -
<PAGE>
 
          other similar statutory right.  The Shares, when issued and sold
          pursuant to this Agreement, will be duly and validly issued, fully
          paid and nonassessable and none of them will have been issued in
          violation of any preemptive or other similar statutory right.  To such
          counsel's knowledge, except as disclosed in the Registration Statement
          and the Prospectus, there is no outstanding option, warrant or other
          right calling for the issuance of, and no commitment, plan or
          agreement to issue, any share of stock of the Company or any security
          convertible into, or exercisable or exchangeable for, stock of the
          Company.  The Common Stock, the Preferred Stock and the Shares conform
          to all statements in relation thereto contained in the Registration
          Statement and the Prospectus in all material respects.

            (iv)  All necessary corporate action has been duly and validly taken
          by the Company to authorize the execution, delivery and performance of
          this Agreement. This Agreement has been duly and validly executed and
          delivered by the Company and constitutes and will constitute the
          legal, valid and binding obligation of the Company enforceable against
          the Company in accordance with its terms except (A) as such
          enforceability may be limited by applicable bankruptcy, insolvency,
          fraudulent transfer, fraudulent conveyance, reorganization, moratorium
          or other similar laws affecting the enforcement of creditors' rights
          generally and by general equitable principles (whether considered in
          proceedings in equity or at law) and (B) with respect to this
          Agreement, to the extent that rights to indemnity or contribution
          under this Agreement may be limited by federal, state or foreign
          securities laws or the public policy underlying such laws.

            (v)  Neither the execution, delivery and performance of this
          Agreement by the Company nor the consummation of any of the
          transactions contemplated hereby (including, without limitation, the
          issuance and sale by the Company of the Shares) will (i) give rise to
          a right to terminate or accelerate the due date of any payment due
          under, or conflict with or result in the breach of any term or
          provision of, or constitute a default (or any event which with notice
          or lapse of time, or both, would constitute a default) under, or
          require any consent or waiver under, or result in the execution or
          imposition of any lien, charge or encumbrance upon any properties or
          assets of the Company or any of its subsidiaries pursuant to the terms
          of, any indenture, mortgage, deed of trust, note or other agreement or
          instrument of which such counsel has knowledge and to which the
          Company or any of its subsidiaries is a party or by which any of them
          or their properties or businesses is bound, or any franchise, license,
          permit, judgment, decree, order, statute, rule or regulation of which
          such counsel has knowledge and applicable to the Company or any of its
          subsidiaries, except for such terminations, accelerations, conflicts,
          breaches, defaults and events which would not, individually or in the
          aggregate, result in a material adverse effect on the assets or
          properties, business, results of operations or financial condition of
          the Company

                                     - 15 -
<PAGE>
 
          and its subsidiaries, taken as a whole, or (ii) violate any provision
          of the charter or by-laws of the Company or any of its subsidiaries.

            (vi)  To such counsel's knowledge, no default exists, and no event
          has occurred which with notice or lapse of time or both would
          constitute a default, in the due performance and observance of any
          term, covenant or condition, of any indenture, mortgage, deed of
          trust, note or any other agreement or instrument to which the Company
          or any of its subsidiaries is a party or by which any of them or their
          assets or properties or businesses is bound or affected which default
          would have a material adverse effect on the assets or properties,
          business, results of operations or financial condition of the Company
          and its subsidiaries, taken as a whole.

            (vii) To such counsel's knowledge, each of the Company and its
          subsidiaries is not in violation of any term or provision of its
          charter or by-laws or of any franchise, license, permit, judgment,
          decree, order, statute, rule or regulation, where the consequences of
          such violation would have a material adverse effect on the assets or
          properties, businesses, results of operations or financial condition
          of the Company and its subsidiaries, taken as a whole.

            (viii)  No consent, approval, authorization or order of any federal
          or New York State court or governmental agency or body or under the
          General Corporation Law of the State of Delaware or otherwise known to
          such counsel to be required is required for the performance of this
          Agreement by the Company or the consummation of the transactions
          contemplated hereby, except such as have been obtained under the
          Securities Act, the Exchange Act and such as may be required under
          state securities or Blue Sky laws in connection with the purchase and
          distribution of the Shares by the several Underwriters.

            (ix)   Except as described in the Registration Statement and the
          Prospectus, to such counsel's knowledge, there is no litigation or
          governmental or other proceeding or investigation before any court or
          before or by any public body or board pending or threatened (and such
          counsel does not know of any basis therefor) against, or involving the
          assets, properties or businesses of, the Company or any of its
          subsidiaries which, if determined adversely to the Company or any of
          its subsidiaries, would materially adversely affect the value or the
          operation of any such assets or properties or the business, results of
          operations or financial condition of the Company and its subsidiaries,
          taken as a whole.

            (x)  The agreement of the Company stating that for a period of 90
          days from the date of the Prospectus it will not, without the
          Representatives' prior written consent, sell, offer to sell,
          distribute, pledge, grant any option for the sale of, or otherwise
          dispose of, directly or indirectly, or encumber, or exercise any

                                     - 16 -
<PAGE>
 
          registration rights with respect to, any shares of Common Stock, any
          options or warrants to purchase any shares of Common Stock, or any
          securities convertible into or exchangeable for shares of Common Stock
          has been duly and validly delivered by the Company and constitutes a
          legal, valid and binding obligation of the Company enforceable against
          it in accordance with its terms, except as the enforceability thereof
          may be limited by applicable bankruptcy, insolvency, fraudulent
          transfer, fraudulent conveyance, reorganization, moratorium or other
          similar laws affecting the enforcement of creditors' rights generally
          and by general equitable principles (whether considered in proceedings
          in equity or at law). __________ shares of Common Stock which are
          outstanding or issuable upon the exercise of stock options or warrants
          or the conversion of debt instruments of which such counsel has
          knowledge are subject to a written agreement obtained by the Company
          pursuant to Section 4(A)(o) of this Agreement.

            (xi)  The statements in the Prospectus under the captions "Risk
          Factors-Extensive Environmental and Land Use Laws and Regulations"; "-
          Anti-Takeover Provisions"; "Shares Eligible for Future Sale" insofar
          as such statements constitute a summary of documents referred to
          therein or matters of law, are fair summaries of the material
          provisions thereof and accurately present in all material respects the
          information called for with respect to such documents and matters. All
          contracts and other documents required to be filed as exhibits to, or
          described in, the Registration Statement of which such counsel has
          knowledge have been so filed with the Commission or are fairly
          described in the Registration Statement, as the case may be.

            (xii)  The Registration Statement, all preliminary prospectuses and
          the Prospectus and each amendment or supplement thereto (except for
          the financial statements and notes and other financial and statistical
          data included therein, as to which such counsel need express no
          opinion) comply as to form in all material respects with the
          requirements of the Securities Act and the Rules.

            (xiii)  The Registration Statement has become effective under the
          Securities Act, and no stop order suspending the effectiveness of the
          Registration Statement has been issued and no proceedings for that
          purpose have been instituted or are threatened, pending or
          contemplated.

          To the extent deemed advisable by such counsel, they may rely as to
matters of fact on certificates of responsible officers of the Company and
public officials and on the opinions of other counsel satisfactory to the
Representatives as to matters which are governed by laws other than the laws of
the State of New York, the General Corporation Law of the State of Delaware and
the federal laws of the United States; provided that such counsel shall state
that in their opinion the Underwriters and they are justified in relying on such
other opinions.  Such counsel shall also state that in connection with rendering
the opinions in (i) and (ii) of this Section 5(h), such counsel has

                                     - 17 -
<PAGE>
 
assumed that the corporation laws of the States of Missouri, Kansas, Ohio,
Illinois, Indiana and Oklahoma are identical to the General Corporation Law of
the State of Delaware.  Copies of such certificates and other opinions shall be
furnished to the Representatives and counsel for the Underwriters.

          In addition, such counsel shall state in a separate letter to the
Representatives that such counsel has participated in conferences with certain
officers of, and with the accountants and counsel for, the Company and
representatives of the Representatives concerning the preparation of the
Registration Statement, the preliminary prospectus and the Prospectus.  Such
separate letter shall also state that although such counsel has made certain
inquiries and investigations in connection with the preparation of the
Registration Statement, such counsel did not independently verify the accuracy
or completeness of the statements made therein or in the preliminary prospectus
or in the Prospectus and the limitations inherent in the role of outside counsel
are such that such counsel cannot and does not assume responsibility for or pass
on the accuracy and completeness of such statements, except insofar as such
statements relate to such counsel.  On the basis of the foregoing, such counsel
shall state that its work in connection with this matter did not disclose any
information that caused such counsel to believe that the Registration Statement
at the time it became effective (except with respect to the financial statements
and notes and schedules thereto and other financial and statistical data, as to
which such counsel need make no statement) contained any untrue statement of a
material fact or omitted to state a material fact required to be stated therein
or necessary to make the statements therein not misleading, or that the
Prospectus as of its date and as of the date of such letter, contained or
contains an untrue statement of a material fact or omitted or omits to state a
material fact necessary in order to make the statements therein, in the light of
the circumstances under which they were made, not misleading (other than
financial statements and other information of a statistical, accounting, or
financial nature which are or should be contained therein, as to which such
counsel shall express no view).

       (i)  [intentionally omitted]

       (j) The Representatives shall have received on each Closing Date from
     counsel for each of the Selling Stockholders (other than Chef Nominees
     Limited), an opinion, addressed to the Representatives and dated such
     Closing Date, and stating in effect that:

               (i)  Such Selling Stockholder has been duly organized, validly
     existing and in good standing under the laws of the state of the
     jurisdiction of its organization and has full legal right and power, and
     has obtained any authorization or approval required by law (other than
     those imposed by the Act and the securities or blue sky laws of certain
     jurisdictions or by the NASD) to enter into and deliver and perform this
     Agreement and to sell, assign, transfer and deliver the Shares to be sold
     by such Selling Stockholder in the manner provided in this Agreement.  This
     Agreement, the Custody Agreement and the Power of Attorney have been duly
     and validly authorized, executed and delivered by such Selling Stockholder
     and

                                     - 18 -
<PAGE>
 
     each constitutes the legal, valid and binding obligation of such Selling
     Stockholder, except as may be limited by bankruptcy, insolvency, fraudulent
     conveyance, reorganization, moratorium or similar laws relating to or
     affecting creditors' rights and remedies generally and by general equitable
     principles (whether applied by a court of law or in equity) and except as
     to rights of indemnity under Section 7 of this Agreement which may be
     limited by federal or state securities laws or the public policy underlying
     those laws.

               (ii)  Each of the representatives of each Selling Stockholder has
     been duly authorized by such Selling Stockholder to execute and deliver on
     behalf of such Selling Stockholder this Agreement, the Custody Agreement,
     the Power of Attorney and any other document necessary or desirable in
     connection with the transactions contemplated hereby or thereby and to
     deliver the Shares to be sold by such Selling Stockholder.

            (iii)  To the best of such counsel's knowledge (without independent
          inquiry), there is no litigation or governmental or other proceeding
          or investigation before any court or before or by any public body or
          board pending or threatened against, or involving the assets,
          properties or business of, such Selling Stockholder, which might have
          a material adverse effect upon the ability of such Selling Stockholder
          to perform its obligations under this Agreement.

            (iv)   Upon delivery of the Shares to the Underwriters, the
          Underwriters will acquire good and valid title to the Shares, free and
          clear of any adverse claims within the meaning of Section 8-302 of the
          New York Uniform Commercial Code.

          To the extent deemed advisable by such counsel, they may rely as to
matters of fact on certificates of responsible officers of the Company, the
Selling Stockholders and public officials. Copies of such certificates shall be
furnished to the Representatives and counsel for the Underwriters.

       (k) All proceedings taken in connection with the sale of the Firm Shares
     and the Option Shares as herein contemplated shall be reasonably
     satisfactory in form and substance to the Representatives and their counsel
     and the Underwriters shall have received from Morgan, Lewis & Bockius LLP a
     favorable opinion, addressed to the Representatives and dated such Closing
     Date, with respect to the Shares, the Registration Statement and the
     Prospectus, and such other related matters, as the Representatives may
     reasonably request, and the Company and the Selling Stockholders shall have
     furnished to Morgan, Lewis & Bockius LLP such documents as they may
     reasonably request for the purpose of enabling them to pass upon such
     matters.

            (l) The Representatives shall have received on each Closing Date a
     certificate, including exhibits thereto, addressed to the Representatives
     and dated such Closing Date, 

                                     - 19 -
<PAGE>
 
     of the Secretary or an Assistant Secretary of the Company, signed in such
     officer's capacity as such officer, as to the (i) certificate of
     incorporation and bylaws of the Company, (ii) resolutions authorizing the
     execution and delivery of the Registration Statement, this Agreement and
     the performance of the transactions contemplated by this Agreement, the
     Registration Statement, the Prospectus and the offering of the Shares, and
     (iii) incumbency of the person or persons authorized to execute and deliver
     the Registration Statement, this Agreement and any other documents
     contemplated by the offering of the Shares.

       (m) The Representatives shall have received on each Closing Date
     certificates of the Secretaries of State of each State where the Company or
     any of its subsidiaries is incorporated and doing business as to the good
     standing of the Company or such subsidiary, listing all charter documents
     on file, if applicable, qualification of the Company or such subsidiary to
     do business as a foreign corporation, if applicable, payment of taxes and
     filing of annual reports.  In addition, the Representatives shall have
     received copies of all charter documents of the Company, County Disposal,
     Inc. and ADS, Inc. certified by the Secretary of State of the State of such
     corporation's incorporation.

          6.     Covenants of the Company and the Selling Stockholders.  (A) The
                 -----------------------------------------------------          
Company, and where specifically stated to be a covenant of the Selling
Stockholders, each of the Selling Stockholders, covenants and agrees as follows:

       (a) The Company shall prepare the Prospectus in a form approved by the
     Representatives and file such Prospectus pursuant to Rule 424(b) under the
     Securities Act not later than the Commission's close of business on the
     second business day following the execution and delivery of this Agreement,
     or, if such second business day would be more than fifteen business days
     after the Effective Date of the Registration Statement or any post-
     effective amendment thereto, such earlier date as would permit such
     Prospectus to be filed without filing a post-effective amendment as set
     forth in Rule 430A(a)(3) under the Securities Act and shall promptly advise
     the Representatives (i) when the Registration Statement shall have become
     effective, (ii) when any amendment thereof or any related registration
     statement filed with the Commission pursuant to Rule 462(b) of the Rules
     shall have become effective, (iii) of any request by the Commission for any
     amendment of the Registration Statement or the Prospectus or for any
     additional information, (iv) of the prevention or suspension of the use of
     any preliminary prospectus or the Prospectus or of the issuance by the
     Commission of any stop order suspending the effectiveness of the
     Registration Statement or the institution or threatening of any proceeding
     for that purpose and (v) of the receipt by the Company of any notification
     with respect to the suspension of the qualification of the Shares for sale
     in any jurisdiction or the initiation or threatening of any proceeding for
     such purpose. If contemplated by this Agreement, the Company shall prepare
     and file with the Commission in conformity with the Securities Act and the
     Rules a related registration statement pursuant to Rule 462(b) under the
     Securities Act for the purpose of registering additional shares. The
     Company shall not

                                     - 20 -
<PAGE>
 
     file any amendment of the Registration Statement or amendment or supplement
     to the Prospectus unless the Company has furnished the Representatives a
     copy for its review prior to filing and shall not file any such proposed
     amendment or supplement to which the Representatives reasonably object. The
     Company shall use its best efforts to prevent the issuance of any such stop
     order and, if issued, to obtain as soon as possible the withdrawal thereof.

       (b) If, at any time when a prospectus relating to the Shares is required
     to be delivered under the Securities Act and the Rules, any event occurs as
     a result of which the Prospectus as then amended or supplemented would
     include any untrue statement of a material fact or omit to state any
     material fact necessary to make the statements therein in the light of the
     circumstances under which they were made not misleading, or if it shall be
     necessary to amend or supplement the Prospectus to comply with the
     Securities Act or the Rules, the Company promptly shall prepare and file
     with the Commission, subject to the third sentence of paragraph (a) of this
     Section 6(A), an amendment or supplement which shall correct such statement
     or omission or an amendment which shall effect such compliance.

       (c) The Company shall make generally available to its security holders
     and to the Representatives as soon as practicable, but not later than 45
     days after the end of the 12-month period beginning at the end of the
     fiscal quarter of the Company during which the Effective Date occurs (or 90
     days if such 12-month period coincides with the Company's fiscal year), an
     earnings statement (which need not be audited) of the Company, covering
     such 12-month period, which shall satisfy the provisions of Section 11(a)
     of the Securities Act or Rule 158 of the Rules.

       (d) The Company shall furnish to the Representatives and counsel for the
     Underwriters, without charge, signed copies of the Registration Statement
     (including all exhibits thereto and amendments thereof) and to each other
     Underwriter a copy of the Registration Statement (without exhibits thereto)
     and all amendments thereof and, so long as delivery of a prospectus by an
     Underwriter or dealer may be required by the Securities Act or the Rules,
     as many copies of any preliminary prospectus and the Prospectus and any
     amendments thereof and supplements thereto as the Representatives may
     reasonably request.

       (e) The Company and the Selling Stockholders shall cooperate with the
     Representatives and their counsel in endeavoring to qualify the Shares for
     offer and sale under the laws of such jurisdictions as the Representatives
     may designate and shall maintain such qualifications in effect so long as
     required for the distribution of the Shares; provided, however, that
     neither the Company nor the Selling Stockholders shall be required in
     connection therewith, as a condition thereof, to qualify as a foreign
     corporation or to execute a general consent to service of process in any
     jurisdiction or subject itself to taxation as doing business in any
     jurisdiction.

                                     - 21 -
<PAGE>
 
       (f) For a period of five years after the date of this Agreement, the
     Company shall supply to the Representatives, and to each other Underwriter
     who may so request in writing, copies of such financial statements and
     other periodic and special reports as the Company may from time to time
     distribute generally to the holders of any class of its capital stock and
     to furnish to the Representatives a copy of each annual or other report it
     shall be required to file with the Commission.

       (g) Without the prior written consent of the Representatives, for a
     period of 90 days after the date of this Agreement, the Company shall not
     issue, sell or register with the Commission, or otherwise encumber or
     dispose of, directly or indirectly, any equity securities of the Company
     (or any securities convertible into or exercisable or exchangeable for
     equity securities of the Company), except for (i) the issuance of the
     Shares pursuant to the Registration Statement, (ii) the issuance of shares
     pursuant to the exercise of outstanding options under the Company's
     existing stock option plans, (iii) in connection with an acquisition by the
     Company of another entity pursuant to which the Company sells or transfers
     any of its shares of Common Stock to a third party as part or all of the
     purchase price of such entity; provided, however, that prior to any sale or
     transfer, the Company shall use commercially reasonable efforts to obtain
     the agreement of such third party in writing with the Representatives that
     it will not sell, offer to sell, distribute, pledge, grant any option for
     the sale of, or otherwise dispose of, directly or indirectly, or encumber,
     or exercise any registration rights with respect to, such shares of Common
     Stock, any options or warrants to purchase any shares of Common Stock, or
     any securities convertible into or exchangeable for  shares of Common Stock
     for the remainder of the 90 days after the date of this Agreement, and (iv)
     the sale or transfer by the Company of shares of Common Stock in connection
     with the hiring of officers or directors not previously employed by the
     Company; provided, however, that prior to any sale or transfer, such
     officer or director shall have agreed in writing with the Representatives
     that he or she will not sell, offer to sell, distribute, pledge, grant any
     option for the sale of, or otherwise dispose of, directly or indirectly, or
     encumber, or exercise any registration rights with respect to, such shares
     of Common Stock, any options or warrants to purchase any shares of Common
     Stock, or any securities convertible into or exchangeable for  shares of
     Common Stock for the remainder of the 90 days after the date of this
     Agreement.

       (h) On or before completion of this offering, the Company shall make all
     filings required under applicable securities laws and by the Nasdaq
     National Market (including any required registration under the Exchange
     Act).

          (B) The Company agrees to pay, or reimburse if paid by the
Representatives, whether or not the transactions contemplated hereby are
consummated or this Agreement is terminated, all costs and expenses of the
Company and the Selling Stockholders incident to the public offering of the
Shares and the performance of the obligations of the Company under this
Agreement including those relating to (i) the preparation, printing, filing and
distribution of the

                                     - 22 -
<PAGE>
 
Registration Statement including all exhibits thereto, each preliminary
prospectus, the Prospectus, all amendments and supplements to the Registration
Statement and the Prospectus, and the printing, filing and distribution of this
Agreement; (ii) the preparation and delivery of certificates for the Shares to
the Underwriters; (iii) the registration or qualification of the Shares for
offer and sale under the securities or Blue Sky laws of the various
jurisdictions referred to in Section 6(A)(e), including the fees and
disbursements of counsel for the Underwriters in connection with such
registration and qualification and the preparation, printing, distribution and
shipment of preliminary and supplementary Blue Sky memoranda (it being
understood that the Company shall not be responsible for the fees and
disbursements of counsel for the Underwriters other than as described in this
Section 6(B)(iii)); (iv) the furnishing (including costs of shipping and
mailing) to the Representatives and to the Underwriters of copies of each
preliminary prospectus, the Prospectus and all amendments or supplements to the
Prospectus, and of the several documents required by this Section to be so
furnished, as may be reasonably requested for use in connection with the
offering and sale of the Shares by the Underwriters or by dealers to whom Shares
may be sold; (v) the filing fees of the National Association of Securities
Dealers, Inc. in connection with its review of the terms of the public offering;
(vi) the furnishing (including costs of shipping and mailing) to the
Representatives and to the Underwriters of copies of all reports and information
required by Section 6(A)(f); and (vii) inclusion of the Shares for quotation on
the Nasdaq National Market.

            7.   Indemnification.
                 --------------- 

       (a) The Company and the Selling Stockholders agree to indemnify and hold
     harmless each Underwriter and each person, if any, who controls any
     Underwriter within the meaning of Section 15 of the Securities Act or
     Section 20 of the Exchange Act against any and all losses, claims, damages
     and liabilities, joint or several (including any reasonable investigation,
     legal and other expenses incurred in connection with, and any amount paid
     in settlement of, any action, suit or proceeding or any claim asserted), to
     which they, or any of them, may become subject under the Securities Act,
     the Exchange Act or other federal or state law or regulation, at common law
     or otherwise, insofar as such losses, claims, damages or liabilities arise
     out of or are based upon any untrue statement or alleged untrue statement
     of a material fact contained in any preliminary prospectus, the
     Registration Statement or the Prospectus or any amendment thereof or
     supplement thereto, or arise out of or are based upon any omission or
     alleged omission to state therein a material fact required to be stated
     therein or necessary to make the statements therein not misleading;
     provided, however, that such indemnity shall not inure to the benefit of
     any Underwriter (or any person controlling such Underwriter) on account of
     any losses, claims, damages or liabilities arising from the sale of the
     Shares to any person by such Underwriter (i) if such untrue statement or
     omission or alleged untrue statement or omission was made in such
     preliminary prospectus, the Registration Statement or the Prospectus, or
     such amendment or supplement, in reliance upon and in conformity with
     information furnished in writing to the Company by the Representatives on
     behalf of any Underwriter specifically for use therein or, (ii) as to any
     preliminary prospectus, with respect to any Underwriter, to the extent that
     any such loss, claim,

                                     - 23 -
<PAGE>
 
     damage or liability of such Underwriter results from an untrue statement of
     a material fact contained in, or the omission of a material fact from, such
     preliminary prospectus, which untrue statement or omission was corrected in
     the Prospectus, if such Underwriter sold Shares to the person alleging such
     loss, claim, damage or liability without sending or giving, at or prior to
     the written confirmation of such sale, a copy of the Prospectus, unless
     such failure resulted from the failure of the Company to deliver copies of
     the Prospectus to such Underwriter on a timely basis to permit such sending
     or giving; provided, further, that no Selling Stockholder shall be
     responsible for losses, claims, damages or liabilities arising out of or
     based upon such untrue statement or alleged untrue statement or omission
     thereof based upon information other than information provided in writing
     by such Selling Stockholder expressly for use in the Registration
     Statement. This indemnity agreement will be in addition to any liability
     which the Company or the Selling Stockholders may otherwise have.

       (b) Each Underwriter agrees, severally and not jointly, to indemnify and
     hold harmless the Company, the Selling Stockholders, each person, if any,
     who controls the Company or the Selling Stockholders within the meaning of
     Section 15 of the Securities Act or Section 20 of the Exchange Act, each
     director of the Company, and each officer of the Company who signs the
     Registration Statement, to the same extent as the foregoing indemnity from
     the Company and the Selling Stockholders to each Underwriter, but only
     insofar as such losses, claims, damages or liabilities arise out of or are
     based upon any untrue statement or omission or alleged untrue statement or
     omission which was made in any preliminary prospectus, the Registration
     Statement or the Prospectus, or any amendment thereof or supplement
     thereto, contained in the last paragraph of the cover page, in the
     paragraph relating to stabilization or the paragraph relating to affiliate
     transactions on the inside front cover page of the Prospectus and the
     statements with respect to the public offering of the Shares under the
     caption "Underwriting" in the Prospectus; provided, however, that the
     obligation of each Underwriter to indemnify the Company or a Selling
     Stockholder (including any controlling person, director or officer thereof)
     shall be limited to the net proceeds received by the Company or such
     Selling Stockholder from such Underwriter.

       (c) Any party that proposes to assert the right to be indemnified under
     this Section will, promptly after receipt of notice of commencement of any
     action, suit or proceeding against such party in respect of which a claim
     is to be made against an indemnifying party or parties under this Section,
     notify each such indemnifying party of the commencement of such action,
     suit or proceeding, enclosing a copy of all papers served. No
     indemnification provided for in Section 7(a) or 7(b) shall be available to
     any party who shall fail to give notice as provided in this Section 7(c) if
     the party to whom notice was not given was unaware of the proceeding to
     which such notice would have related and was prejudiced by the failure to
     give such notice but the omission so to notify such indemnifying party of
     any such action, suit or proceeding shall not relieve it from any liability
     that it may have to any indemnified party for contribution or otherwise
     than

                                     - 24 -
<PAGE>
 
     under this Section. In case any such action, suit or proceeding shall be
     brought against any indemnified party and it shall notify the indemnifying
     party of the commencement thereof, the indemnifying party shall be entitled
     to participate in, and, to the extent that it shall wish, jointly with any
     other indemnifying party similarly notified, to assume the defense thereof,
     with counsel reasonably satisfactory to such indemnified party, and after
     notice from the indemnifying party to such indemnified party of its
     election so to assume the defense thereof and the approval by the
     indemnified party of such counsel, the indemnifying party shall not be
     liable to such indemnified party for any legal or other expenses, except as
     provided below and except for the reasonable costs of investigation
     subsequently incurred by such indemnified party in connection with the
     defense thereof. The indemnified party shall have the right to employ its
     counsel in any such action, but the fees and expenses of such counsel shall
     be at the expense of such indemnified party unless (i) the employment of
     counsel by such indemnified party has been authorized in writing by the
     indemnifying parties, (ii) the indemnified party shall have reasonably
     concluded that there may be a conflict of interest between the indemnifying
     parties and the indemnified party in the conduct of the defense of such
     action (in which case the indemnifying parties shall not have the right to
     direct the defense of such action on behalf of the indemnified party) or
     (iii) the indemnifying parties shall not have employed counsel to assume
     the defense of such action within a reasonable time after notice of the
     commencement thereof, in each of which cases the fees and expenses of
     counsel shall be at the expense of the indemnifying parties. An
     indemnifying party shall not be liable for any settlement of any action,
     suit, proceeding or claim effected without its written consent; provided,
     however, that such consent shall not be unreasonably withheld.

          8.     Contribution.  In order to provide for just and equitable
                 ------------                                             
contribution in circumstances in which the indemnification provided for in
Sections 7(a) and 7(b) is due in accordance with its terms but for any reason is
held to be unavailable from the Company or the Selling Stockholders or the
Underwriters, as the case may be, the Company, the Selling Stockholders and the
Underwriters shall contribute to the aggregate losses, claims, damages and
liabilities (including any investigation, legal and other expenses reasonably
incurred in connection with, and any amount paid in settlement of, any action,
suit or proceeding or any claims asserted, but after deducting any contribution
received by any person entitled hereunder to contribution from any person who
may be liable for contribution) to which the Company, the Selling Stockholders
and one or more of the Underwriters may be subject in such proportion as is
appropriate to reflect the relative benefits received by the Company and the
Selling Stockholders on the one hand and the Underwriters on the other from the
offering of the Shares or, if such allocation is not permitted by applicable law
or indemnification is not available as a result of the indemnifying party not
having received notice as provided in Section 7 hereof, in such proportion as is
appropriate to reflect not only the relative benefits referred to above but also
the relative fault of the Company and the Selling Stockholders on the one hand
and the Underwriters on the other in connection with the statements or omissions
which resulted in such losses, claims, damages, liabilities or expenses, as well
as any other relevant equitable considerations. The relative benefits received
by the Company, the Selling Stockholders and the Underwriters shall be deemed to
be in the same proportion as (x) the total

                                     - 25 -
<PAGE>
 
proceeds from the offering (net of underwriting discounts but before deducting
expenses) received by the Company or the Selling Stockholders, as set forth in
the table on the cover page of the Prospectus, bear to (y) the underwriting
discounts received by the Underwriters, as set forth in the table on the cover
page of the Prospectus. The relative fault of the Company, the Selling
Stockholders and the Underwriters shall be determined by reference to, among
other things, whether the untrue or alleged untrue statement or omission or
alleged omission of a material fact related to information supplied by the
Company, the Selling Stockholders or the Underwriters and the parties' relative
intent, knowledge, access to information and opportunity to correct or prevent
such statement or omission. The Company, the Selling Stockholders and the
Underwriters agree that it would not be just and equitable if contribution
pursuant to this Section 8 were determined by pro rata allocation (even if the
Underwriters were treated as one entity for such purpose) or by any other method
of allocation which does not take account of the equitable considerations
referred to above. Notwithstanding the provisions of this Section 8, (i) in no
case shall any Underwriter (except as may be provided in the Agreement Among
Underwriters) be liable or responsible for any amount in excess of the
underwriting discount applicable to the Shares purchased by such Underwriter
hereunder, and (ii) the Company and the Selling Stockholders shall be liable and
responsible for any amount in excess of such underwriting discount; provided,
however, that no person guilty of fraudulent misrepresentation (within the
meaning of Section 11(f) of the Securities Act) shall be entitled to
contribution from any person who was not guilty of such fraudulent
misrepresentation. For purposes of this Section 8, each person, if any, who
controls an Underwriter within the meaning of Section 15 of the Securities Act
or Section 20(a) of the Exchange Act shall have the same rights to contribution
as such Underwriter, and each person, if any, who controls the Company or a
Selling Stockholder within the meaning of the Section 15 of the Securities Act
or Section 20(a) of the Exchange Act, each officer of the Company who shall have
signed the Registration Statement and each director of the Company shall have
the same rights to contribution as the Company or such Selling Stockholder, as
the case may be, subject in each case to clauses (i) and (ii) in the immediately
preceding sentence of this Section 8. Any party entitled to contribution will,
promptly after receipt of notice of commencement of any action, suit or
proceeding against such party in respect of which a claim for contribution may
be made against another party or parties under this Section, notify such party
or parties from whom contribution may be sought, but the failure so to notify
such party or parties from whom contribution may be sought shall not relieve the
party or parties from whom contribution may be sought from any other obligation
it or they may have hereunder or otherwise than under this Section. No party
shall be liable for contribution with respect to any action, suit, proceeding or
claim settled without its written consent. The Underwriter's obligations to
contribute pursuant to this Section 8 are several in proportion to their
respective underwriting commitments and not joint.

          Notwithstanding any other provision of Section 7 or Section 8 hereof,
(i) in no event shall any Selling Stockholder be required to pay an aggregate
amount of contribution or other payments in respect of losses, expenses,
liabilities or claims under this Section 8 which would be greater than the
aggregate amount such Selling Stockholder would have been required to pay under
Section 7 in respect of such losses, expenses, liabilities or claims if such
indemnification were available, and (ii) none of the Selling Stockholders shall
be liable for indemnification or contribution

                                     - 26 -
<PAGE>
 
payments or any other payments under Section 7 or Section 8 hereof in an
aggregate amount exceeding the net proceeds received by such Selling Stockholder
from the sale of Shares hereunder.

          9.     Termination.  This Agreement may be terminated with respect to
                 -----------                                                   
the Shares to be purchased on a Closing Date by the Representatives by notifying
the Company at any time

       (a) in the absolute discretion of the Representatives at or before any
     Closing Date:  (i) if on or prior to such date, any domestic or
     international event or act or occurrence has materially disrupted, or in
     the opinion of the Representatives will in the future materially disrupt,
     the securities markets; (ii) if there has occurred any new outbreak or
     material escalation of hostilities or other calamity or crisis the effect
     of which on the financial markets of the United States is such as to make
     it, in the judgment of the Representatives, inadvisable to proceed with the
     offering; (iii) if there shall be such a material adverse change in general
     financial, political or economic conditions or the effect of international
     conditions on the financial markets in the United States is such as to make
     it, in the judgment of the Representatives, inadvisable or impracticable to
     market the Shares; (iv) if trading in the Shares has been suspended by the
     Commission or trading generally on the New York Stock Exchange, Inc. or on
     the American Stock Exchange, Inc. has been suspended or limited, or minimum
     or maximum ranges for prices for securities shall have been fixed, or
     maximum ranges for prices for securities have been required, by said
     exchanges or by order of the Commission, the National Association of
     Securities Dealers, Inc., or any other governmental or regulatory
     authority; or (v) if a banking moratorium has been declared by any state or
     federal authority, or

       (b) at or before any Closing Date, that any of the conditions specified
     in Section 5 shall not have been fulfilled when and as required by this
     Agreement.

          If this Agreement is terminated pursuant to any of its provisions,
neither the Company nor the Selling Stockholders shall be under any liability to
any Underwriter, and no Underwriter shall be under any liability to the Company
or the Selling Stockholders, except that (y) if this Agreement is terminated by
the Representatives or the Underwriters because of any failure, refusal or
inability on the part of the Company or a Selling Stockholder to comply with the
terms or to fulfill any of the conditions of this Agreement, the Company will,
upon the request of the Representatives, reimburse the Underwriters for all out-
of-pocket expenses (including the fees and disbursements of their counsel)
incurred by them in connection with the proposed purchase and sale of the Shares
or in contemplation of performing their obligations hereunder and (z) no
Underwriter who shall have failed or refused to purchase the Shares agreed to be
purchased by it under this Agreement, without some reason sufficient hereunder
to justify cancellation or termination of its obligations under this Agreement,
shall be relieved of liability to the Company, the Selling Stockholders or to
the other Underwriters for damages occasioned by its failure or refusal.

          10.    Substitution of Underwriters.  If one or more of the
                 ----------------------------                        
Underwriters shall fail (other than for a reason sufficient to justify the
cancellation or termination of this Agreement under 

                                     - 27 -
<PAGE>
 
Section 9) to purchase on any Closing Date the Shares agreed to be purchased on
such Closing Date by such Underwriter or Underwriters, the Representatives may
find one or more substitute underwriters to purchase such Shares or make such
other arrangements as the Representatives may deem advisable or one or more of
the remaining Underwriters may agree to purchase such Shares in such proportions
as may be approved by the Representatives, in each case upon the terms set forth
in this Agreement. If no such arrangements have been made by the close of
business on the business day following such Closing Date,

       (a) if the number of Shares to be purchased by the defaulting
     Underwriters on such Closing Date shall not exceed 10% of the Shares that
     all the Underwriters are obligated to purchase on such Closing Date, then
     each of the nondefaulting Underwriters shall be obligated to purchase such
     Shares on the terms herein set forth in proportion to their respective
     obligations hereunder; provided, that in no event shall the maximum number
     of Shares that any Underwriter has agreed to purchase pursuant to Section 1
     be increased pursuant to this Section 10 by more than one-ninth of such
     number of Shares without the written consent of such Underwriter, or

       (b) if the number of Shares to be purchased by the defaulting
     Underwriters on such Closing Date shall exceed 10% of the Shares that all
     the Underwriters are obligated to purchase on such Closing Date, then the
     Company shall be entitled to an additional business day within which it
     may, but is not obligated to, find one or more substitute underwriters
     reasonably satisfactory to the Representatives to purchase such Shares upon
     the terms set forth in this Agreement.

          In any such case, either the Representatives or the Company shall have
the right to postpone the applicable Closing Date for a period of not more than
five business days in order that necessary changes and arrangements (including
any necessary amendments or supplements to the Registration Statement or
Prospectus) may be effected by the Representatives and the Company.  If the
number of Shares to be purchased on such Closing Date by such defaulting
Underwriter or Underwriters shall exceed 10% of the Shares that all the
Underwriters are obligated to purchase on such Closing Date, and none of the
nondefaulting Underwriters or the Company shall make arrangements pursuant to
this Section within the period stated for the purchase of the Shares that the
defaulting Underwriters agreed to purchase, this Agreement shall terminate with
respect to the Shares to be purchased on such Closing Date without liability on
the part of any nondefaulting Underwriter to the Company or the Selling
Stockholders and without liability on the part of the Company and the Selling
Stockholders, except in both cases as provided in Sections 6(B), 7, 8 and 9.
The provisions of this Section shall not in any way affect the liability of any
defaulting Underwriter to the Company, the Selling Stockholders or the
nondefaulting Underwriters arising out of such default.  A substitute
underwriter hereunder shall become an Underwriter for all purposes of this
Agreement.

          11.  Miscellaneous.  The respective agreements, representations,
               -------------                                              
warranties, indemnities and other statements of the Company or its officers, of
the Selling Stockholders and of 

                                     - 28 -
<PAGE>
 
the Underwriters set forth in or made pursuant to this Agreement shall remain in
full force and effect, regardless of any investigation made by or on behalf of
any Underwriter, any Selling Stockholder or the Company or any of the officers,
directors or controlling persons referred to in Sections 7 and 8 hereof, and
shall survive delivery of and payment for the Shares. The provisions of Sections
6(B), 7, 8 and 9 shall survive the termination or cancellation of this
Agreement.

          This Agreement has been and is made for the benefit of the
Underwriters, the Company and the Selling Stockholders and their respective
successors and assigns, and, to the extent expressed herein, for the benefit of
persons controlling any of the Underwriters, the Company or the Selling
Stockholders, and directors and officers of the Company, the Selling
Stockholders, if any, and their respective successors and assigns, and no other
person shall acquire or have any right under or by virtue of this Agreement.
The term "successors and assigns" shall not include any purchaser of Shares from
any Underwriter merely because of such purchase.

          All notices and communications hereunder shall be in writing and
mailed or delivered or by telephone or telegraph if subsequently confirmed in
writing, (a) if to the Representatives, c/o CIBC Oppenheimer Corp., CIBC
Oppenheimer Tower, World Financial Center, New York, New York 10281 Attention:
Marshall A. Heinberg, (b) if to the Company, to its agent for service as such
agent's address appears on the cover page of the Registration Statement and (c)
if to the Selling Stockholders, to the address set forth in the Custody
Agreement and Power of Attorney.

            This Agreement shall be governed by and construed in accordance with
the laws of the State of New York.

                                     - 29 -
<PAGE>
 
          This Agreement may be signed in any number of counterparts, each of
which shall be an original, with the same effect as if the signatures thereto
and hereto were upon the same instrument.

            Please confirm that the foregoing correctly sets forth the agreement
among us.

                                    Very truly yours,

                                    AMERICAN DISPOSAL SERVICES, INC.


                                    By
                                      ---------------------------------------
                                          Name:
                                          Title:

                                    THE SELLING STOCKHOLDERS NAMED 
                                    ON SCHEDULE II HERETO


                                    By
                                      ---------------------------------------
                                         Name:
                                         Title: Attorney-in-fact

Confirmed:

CIBC OPPENHEIMER CORP.
DONALDSON, LUFKIN & JENRETTE
  SECURITIES CORPORATION

Acting severally on behalf of itself
and as representative of the several
Underwriters named in Schedule I annexed
hereto.

By CIBC Oppenheimer Corp.


By
  ----------------------------------------
Name:  Marshall A. Heinberg
Title: Managing Director

                                     - 30 -
<PAGE>
 
                                   SCHEDULE I

                                                                     
                                                         NUMBER OF   
                                                       FIRM SHARES TO
                        NAME                            BE PURCHASED 
- -----------------------------------------------------  --------------

Oppenheimer & Co., Inc. ..............................
Donaldson, Lufkin & Jenrette Securities Corporation...
 
     Total ...........................................      4,000,000
                                                            =========

                                     - i -
<PAGE>
 
                                  SCHEDULE II

                              SELLING STOCKHOLDERS


                                Number of Firm Shares
                                ---------------------
Name                            to be Purchased
- ----                            ---------------

Charterhouse Environmental                    933,528
 Holdings, L.L.C.

Charterhouse Equity Partners                1,253,389
 II, L.P.

CDI Equity, LLC                               322,014

Chef Nominees Limited                           2,440
                                            ---------

             Total                          2,511,371

                                    - ii -
<PAGE>
 
                                 SCHEDULE III


Subsidiary                                 State of Incorporation
- ----------                                 ----------------------


County Disposal, Inc.                                 Delaware

American Disposal Services of Kansas, Inc.            Kansas

American Disposal Services of Illinois, Inc.          Delaware

County Disposal (Ohio), Inc.                          Delaware
                                               
County Landfill, Inc.                                 Delaware
                                               
Southwest Waste, Inc.                                 Missouri
                                               
Tate's Transfer Systems, Inc.                         Missouri
                                               
Bowers Phase II, Inc.                                 Ohio
                                               
Allied Waste Systems, Inc.                            Ohio
                                               
Ross Bros. Waste and Recycling Co., Inc.              Ohio
                                               
Illinois Bulk Handlers, Inc.                          Illinois
                                               
Shred-All Recycling Systems, Inc.                     Illinois
                                               
Fred B. Barbara Trucking Co., Inc.                    Illinois
                                               
Environtech, Inc.                                     Delaware
                                               
ADS, Inc.                                             Oklahoma
                                               
Pittsburgh County Landfill, Inc.                      Oklahoma
                                               
American Disposal Services of Missouri, Inc.          Oklahoma
                                               
T & G Disposal, Inc.                                  Indiana
                                               
ADS (Illinois), Inc.                                  Illinois
                                               
                                    - iii -
<PAGE>
 
Sunset Disposal, Inc.                                 Kansas
                                               
Resource Recovery, Inc.                               Kansas
                                               
Oklahoma Refuse, Inc.                                 Oklahoma

                                    - iv -

<PAGE>
 
                                                                     EXHIBIT 5.1

                              PROSKAUER ROSE LLP
                                 1585 BROADWAY
                         NEW YORK, NEW YORK 10036-8299



                                March 13, 1998



American Disposal Services, Inc.
745 McClintock Drive
Suite 230
Burr Ridge, IL 60521

                Re:     Registration Statement on Form S-3
                        File No. 333-
                        ----------------------------------

Gentlemen:

                You have requested our opinion in connection with the above-
referenced registration statement, as amended (the "Registration Statement"),
filed by American Disposal Services, Inc., a Delaware corporation (the
"Company"), with the Securities and Exchange Commission under the Securities Act
of 1933, as amended, relating to 4,000,000 shares of the Common Stock, par value
$.01 per share (the "Common Stock") of the Company, of which 2,511,371 shares of
Common Stock are to be sold to the underwriters by certain selling stockholders
and 1,488,629 shares of Common Stock are to be issued and sold to the
underwriters by the Company (the "Firm Shares"), and up to 600,000 additional
shares of Common Stock to cover over-allotment options granted to the
underwriters from the Company, for sale to the public pursuant to an
underwritten public offering.

                As counsel to the Company, we have examined such corporate 
records, other documents and questions of law as we have considered necessary or
appropriate for the purpose of this opinion, including the Certificate of 
Incorporation, as amended, and the By-laws of the Company, the Registration 
Statement and the exhibits thereto, including the form of underwriting agreement
relating to the Shares filed as Exhibit 1.1 to the Registration Statement (the 
"Underwriting Agreement"), and we have made such investigations of law as we 
have deemed necessary in order to render the opinion hereinafter set forth. In 
such examinations, we have assumed the genuineness of signatures and the 
conformity to original documents of the documents supplied to us as copies. As 
to relevant questions of fact material to our opinion, we have relied upon 
statements and certificates of officers and representatives of the Company.

                In giving this opinion, we have assumed that the certificates 
for the Shares, when issued, will have been duly executed on behalf of the 
Company by the Company's transfer agent and registered by the Company's
registrar and will conform, except as to denominations, to specimens we have
examined.
<PAGE>
 
        March 13, 1998
        Page 2



                Based upon and subject to the foregoing, we are of the opinion 
that:

                1.      The Shares have been authorized;

                2.      The Shares to be sold by the Company, when issued in 
accordance with the Underwriting Agreement, will be validly issued, fully paid 
and non-assessable; and

                3.      The Shares to be sold by the Selling Stockholders have 
been validly issued and are fully paid and non-assessable.

                We hereby consent to the references to our firm under the
caption "Legal Matters" in the Registration Statement and to the use of this
opinion as an exhibit to the Registration Statement. In giving this consent, we
do not thereby admit that we come within the category of persons whose consent
is required under Section 7 of the Securities Act of 1933, as amended, or the
rules and regulations of the Securities and Exchange Commission thereunder.

                                Very truly yours,

                                /s/ PROSKAUER ROSE LLP




<PAGE>
 
                                                                    EXHIBIT 23.1
 
                        CONSENT OF INDEPENDENT AUDITORS
 
  We consent to the reference to our firm under the caption "Experts" and to
the use of our report dated February 24, 1998 with respect to the financial
statements of American Disposal Services, Inc. in the Registration Statement
(Form S-3 No. 333-00000) and the related Prospectus of American Disposal
Services, Inc. for the registration of up to 4,600,000 shares of its common
stock.
 
                                          /s/ Ernst & Young LLP
 
Chicago, Illinois
March 13, 1998

<TABLE> <S> <C>

<PAGE>

<ARTICLE>       5
<RESTATED> 
<MULTIPLIER>    1,000
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-START>                             JAN-01-1997
<PERIOD-END>                               DEC-31-1997
<CASH>                                           2,763
<SECURITIES>                                         0
<RECEIVABLES>                                   23,052
<ALLOWANCES>                                     1,326
<INVENTORY>                                          0
<CURRENT-ASSETS>                                28,510
<PP&E>                                         174,340
<DEPRECIATION>                                       0
<TOTAL-ASSETS>                                 373,024
<CURRENT-LIABILITIES>                           27,789
<BONDS>                                         20,788
                                0
                                          0
<COMMON>                                           193
<OTHER-SE>                                     297,182
<TOTAL-LIABILITY-AND-EQUITY>                   373,024
<SALES>                                              0
<TOTAL-REVENUES>                               121,363
<CGS>                                           65,947
<TOTAL-COSTS>                                  104,743
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                               6,223
<INCOME-PRETAX>                                 10,872
<INCOME-TAX>                                     3,531
<INCOME-CONTINUING>                              7,341
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     7,341
<EPS-PRIMARY>                                     0.56
<EPS-DILUTED>                                     0.53
        

</TABLE>


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