EARTH SCIENCES INC
8-K, 1997-05-12
MINERAL ROYALTY TRADERS
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                                 CURRENT REPORT
                                        
     PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
                                        
                    Date of Report ...........April 30, 1997
                                        
                                        
                              Earth Sciences, Inc.
              (Exact name of registrant as specified in its charter)
                                        
                      Colorado                      0-6088
 (State of incorporation) (Commission File Number)
 
                               84-0503749
                    (IRS Employer Identification No.)
                                        
                 910 12th Street, Golden, Colorado        80401
           (Address of principal executive offices, including Zip Code)
                                        
     (Registrant's telephone number, including area code):   (303) 279-7641
                                        
 
 Item 2.  Acquisition or Disposition of Assets.
 
 On  April  30,  1997, Registrant acquired a 51% interest in ADA Environmental
 Solutions  LLC  ("ADA") through the purchase of an additional 46.2%  interest
 from  ADA.   Registrant had previously purchased a 4.8% interest  in  ADA  in
 February  1997  by   payment  to  ADA of $400,000.  The  46.2%  interest  was
 purchased by payment to ADA of $500,000 and a non-interest bearing promissory
 note in the amount of $1,600,000. The purchase price for the transaction  was
 negotiated among Registrant and ADA based on the future anticipated  earnings
 and  cash flow of ADA.  Funds for the purchase were from Registrant's working
 capital.   Registrant also obtained an option to acquire  the  remaining  49%
 interest  in ADA exercisable for a six month period commencing May  1,  1998.
 The  option  is exercisable by issuance of  1,715,600 shares of  Registrant's
 common  stock  in exchange for all the outstanding stock of ADA-ES,  Inc.,  a
 Colorado corporation, whose only asset is the remaining 49% interest in ADA.
 
 ADA's only significant asset is its proprietary technology designed to reduce
 particulate  emissions  from  coal-fired  boilers.  Registrant's   management
 believes  ADA's  proprietary  non-toxic  chemical  conditioner  offers   both
 technical  and  economic  advantages over the hazardous  chemicals  currently
 being  used.     Michael  D. Durham of ADA has been elected  to  Registrant's
 Board of Directors as part of the transaction.
 
 The  operating Agreement of ADA provides that a member's percentage interests
 for purposes of voting and ownership of assets is to be based on the ratio of
 its  capital  contributions to the total capital contributions  in  ADA.   In
 accordance  with such provisions, Registrant has an 83% voting and  ownership
 interest in ADA, but a 51% interest in ADA's net profits.
 
 Item 7.  Financial Statements and Exhibits.
 
 (a) Financial Statements of Business Acquired.
 The audited financial statements of ADA Environmental Solutions LLC dated
 December 31, 1996 are filed herewith as Exhibit 99.1.
 
 (b)  Pro Forma Financial Information.
 
 The following unaudited pro forma combined condensed balance sheets as of
 December 31, 1996, show the effect on the historical balance sheet of
 Registrant (ESI) as if the acquisition of its interest in ADA Environmental
 Solutions LLC (ADA) had occurred on December 31, 1996.  The unaudited pro
 forma combined condensed statements of operations combines the operations of
 ESI and ADA as if the acquisitions were completed at January 1, 1996.
 Activities for ADA commenced in March  1996 (the date ADA was established).
 
 These statements are not necessarily indicative of future operations or
 actual results that would have occurred had the acquisition been consummated
 at the beginning of the period indicated.
 
 The unaudited pro forma combined condensed financial statements should be
 read in conjunction with the historical financial statements and notes
 thereto, included either elsewhere in this document or in Registrant's
 December 31, 1996 Form 10-KSB.
 
 <TABLE>
 <CAPTION>
 
 PRO FORMA COMBINED CONDENSED BALANCE SHEET (Amounts in 000's)
 December 31, 1996 (UNAUDITED)
                                                                            
<S>                            <C>          <C>        <C>       <C> <C>
ASSETS                                                      Pro          Pro
                                    ESI         ADA       Forma        Forma
                                                       Adjustme        Combi
                                                            nts          ned
Current assets                 $  2,039          26                    2,065
Property, plant and  equipment   17,198         340                   17,538
 Less accumulated depreciation   (5,043)         (2)                  (5,045)  
Other assets                        207           0         772  (1)     979
                                 ------       -----       -----       ------
Total assets                   $ 14,401         364         772       15,537
                                 ======       =====       =====       ======
LIABILITIES AND EQUITY                                                      
 Current liabilities           $    278         791                    1,069
Long-term liabilities             9,943           0                    9,943
Minority interest                     0           0         346  (2)     346
Stockholders' equity              4,180        (427)        426  (2)   4,179
                                 ------       -----       -----       ------
shareholders' equity           $ 14,401         364         772       15,537                                    
                                 ======       =====       =====       ======
</TABLE>                                                                    
 See accompanying notes.
<TABLE>
<CAPTION>
 
 PRO FORMA CONDENSED STATEMENT OF OPERATIONS (Amounts in 000's except per
 share amounts) For the Year Ended December 31, 1996   (UNAUDITED)
                                                                              
<S>                              <C>       <C>           <C>       <C>  <C>
                                                       Pro Forma           Pro
                                    ESI       ADA    Adjustments         Forma
                                                                        Combin
                                                                            ed
Revenues                         $  798        75              0           873
Expenses                          1,336       501            129  (3)    1,966
                                  -----     -----          -----        ------
Loss from operations               (538)     (426)          (129)       (1,093)
Minority interest                     0         0            209  (4)      209
Income tax benefit                  159         0              0           159
                                -------    ------        -------        ------
Loss before extraordinary item     (379)     (426)            80          (725)
item
Extraordinary gain                  371         0              0           371
                                -------    ------        -------        ------
Net loss                        $    (8)     (426             80          (354)
                                 ======    ======         ======        ======
Net loss per common share:       $  .00       N/A                         (.05)
                                 ======    ======                       ======
</TABLE>
 
 See accompanying notes.
 
 Notes to Pro Forma Financial Statements.
 1.  To record the goodwill associated with the acquisition of ESI's interest
 in ADA.
 2.  To reflect the minority interest in ADA after the acquisition.
 3.  To record the additional expenses associated with amortization of
 goodwill recorded.
 4.  To reflect the minority interest in the loss of ADA for the period ended
 December 31, 1996.
                                        
 (c) Exhibits.  The following Exhibits are filed herewith.
 
 No.       Description
 2.1       Stock Option and Exchange Agreement among Earth Sciences,
 Inc. and ADA-ES, Inc., ADA Environmental Solutions LLC, ADA Technologies,
 Inc., C. Jean Bustard, John F. Wurster, Kenneth E. Baldrey and Cameron E.
 Martin dated April 30, 1997. Exhibits and Schedules to the agreement are as
 follows: (such exhibits and Schedules have been omitted and will be provided
 to the Commission upon request.)
 
         EXHIBITS
         Exhibit A      Promissory Note
         Exhibit B      Exercise Notice
         Exhibit C      Certificate of Earth Sciences
         Exhibit D      Certificate of ADA Technologies, Inc.
         Exhibit E      Voting Agreement
         Exhibit F      Registration Rights Agreement
 
         SCHEDULES
         Schedule 3.5        Financial Statements
         Schedule 3.7        Title and Related Matters
         Schedule 3.8        Intellectual Property
         Schedule 3.9        Litigation
         Schedule 3.10       Insurance Policies and Surety Bonds
         Schedule 3.11       Compliance with Laws
         Schedule 3.17       Contracts and Commitments
         Schedule 5.1        Information Regarding Russ Farmer
         Schedule 6.15(a)    ERISA
         Schedule 10.1(b)    Accrued Incentives
 
 2.2       Amended and Restated Operating Agreement of ADA Environmental
 Solutions LLC, a Colorado Limited Liability Company, April 30, 1997
 
 99.1      Financial Statements of ADA Environmental Solutions LLC, December
 31, 1996.
                                        
                                   SIGNATURES
                                        
      Pursuant to the requirements of the Securities Exchange Act of 1934, the
 registrant has duly caused this report to be signed on behalf by the
 undersigned hereunto duly authorized.
 
 
                                         Earth Sciences, Inc.
                                         -----------------------
                                            (Registrant)
 
 
 Date:  May 12, 1997                     /s/ Mark H. McKinnies
                                         ----------------------------
                                         Mark H. McKinnies, President
 
 
 <PAGE>
 
 EXHIBIT 2.1
 
 
                       STOCK OPTION AND EXCHANGE AGREEMENT
                                        
                                      among
                                        
                              EARTH SCIENCES, INC.
                                        
                                       and
                                        
                                  ADA-ES, INC.
                         ADA ENVIRONMENTAL SOLUTIONS LLC
                             ADA TECHNOLOGIES, INC.
                                 C. JEAN BUSTARD
                                 JOHN F. WURSTER
                               KENNETH E. BALDREY
                                       and
                                CAMERON E. MARTIN
                                        
                                      Dated
                                        
                                 APRIL 30, 1997
                                        
                                        
<PAGE>
                                        
                                TABLE OF CONTENTS
                                                           Page
                                                                              
 RECITALS                                                   1
 
 ARTICLE 1.   INVESTMENT AND OPTION GRANTS                  1
 
 Section 1.1. Additional Investment in ADA-LLC              1
 Section 1.2. Grant of Option                               2
 Section 1.3. Exchange of Shares                            2
 Section 1.4. Option Closing                                2
 Section 1.5. Repurchase Options                            2
 
 ARTICLE 2.   EXCHANGE                                      3
 
 Section 2.1. Exchange Closing                              3
 Section 2.2. Exchange                                      3
 Section 2.3. Issuance of Earth Sciences Common Stock to
                 Each Shareholder                            4
 Section 2.4. Earth Sciences Delivery to the Shareholders   4
 Section 2.5. Shareholders Delivery to Earth Sciences       4
 Section 2.6. Further Assurances                            4
 
 ARTICLE 3.   REPRESENTATIONS AND WARRANTIES OF ADA         5
 
 Section 3.1. Organization                                  5
 Section 3.2. Authorization                                 5
 Section 3.3. Capitalization                                5
 Section 3.4. Consents and Approvals; No Violations         6
 Section 3.5. Financial Statements                          6
 Section 3.6. Taxes                                         6
 Section 3.7. Title and Related Matters                     7
 Section 3.8. Patents, Trademarks and Other Intellectual
                 Property                                   7
 Section 3.9. Litigation                                    7
 Section 3.10.Insurance and Surety Bonds                    7
 Section 3.11.Compliance with Laws                          8
 Section 3.12.Employee Benefit Plans                        8
 Section 3.13.Employment Related Agreements                 8
 Section 3.14.Labor Agreements and Controversies            8
 Section 3.15.Environmental Matters                         8
 Section 3.16.Certain Fees                                  9
 Section 3.17.Contracts and Commitments                     9
 Section 3.18.No Other Representations                     10
 
 ARTICLE 4.   REPRESENTATIONS AND WARRANTIES OF OTHER
                SHAREHOLDERS                               10
 
 Section 4.1. Authorization                                10
 Section 4.2. Shares                                       10
 Section 4.3. Consents and Approvals; No Violations        11
 Section 4.4. No Other Representations                     11
 
 ARTICLE 5.   INVESTMENT REPRESENTATIONS OF THE
                 SHAREHOLDERS                              11
 
 Section 5.1. Purchaser Representative                     11
 Section 5.2. State of Residence or Business               11
 Section 5.3. Tax Consequences                             11
 Section 5.4. Investment Intent                            11
 Section 5.5. Transfer Restrictions                        12
 Section 5.6. Ability to Accept Risk of Investment         12
 Section 5.7. Review of Earth Sciences Documents           12
 Section 5.8. Restricted Securities                        13
 Section 5.9. Disposition of Earth Sciences Common Stock   13
 
 ARTICLE 6.   REPRESENTATIONS AND WARRANTIES OF EARTH
                 SCIENCES                                  13
 
 Section 6.1. Organization, Standing and Power             13
 Section 6.2. Capital Structure                            13
 Section 6.3. Authority; Non-Contravention                 14
 Section 6.4. SEC Documents                                15
 Section 6.5. Earth Sciences Disclosure Material           15
 Section 6.6. Absence of Material Adverse Change           15
 Section 6.7. Reorganization                               15
 Section 6.8. Tax Representations                          15
 Section 6.9. Title and Related Matters                    16
 Section 6.10.Agreements                                   16
 Section 6.11.Litigation                                   16
 Section 6.12.Patents, Trademarks and Other Intellectual
                 Property                                  16
 Section 6.13.Insurance and Surety Bonds                   17
 Section 6.14.Compliance with Laws                         17
 Section 6.15.Employee Benefit Plans                       17
 Section 6.16.Environmental Matters                        18
 Section 6.17.Certain Fees                                 18
 Section 6.18.No Other Representations                     18
 
 ARTICLE 7.   COVENANTS OF EARTH SCIENCES PRIOR TO THE
                 EXCHANGE CLOSING                            18
 
 Section 7.1. Operation in Usual Manner; Access for the
                 Shareholders                              18
 Section 7.2. Corporate Existence, Rights and Franchises   18
 Section 7.3. Nasdaq Listing                               19
 Section 7.4. Corporate Action and Consents                19
 Section 7.5. Conditions to be Satisfied                   19
 Section 7.6. Regulatory Approvals                         19
 Section 7.7. Additional Funding and Payment to ADA        19
 Section 7.8. Seat on Earth Sciences Board of Directors    19
 Section 7.9. Tax-Free Exchange                            19
 Section 7.10.Guarantee of Leases                          20
 
 ARTICLE 8.   COVENANTS OF ADA AND THE OTHER SHAREHOLDERS
                 PRIOR TO THE EXCHANGE CLOSING             20
 
 Section 8.1. Operation in Usual Manner; Access for Earth
                 Sciences                                  20
 Section 8.2. Existence, Rights and Franchises             20
 Section 8.3. Action and Consents                          20
 Section 8.4. Conditions to be Satisfied                   20
 Section 8.5. Regulatory Approvals                         21
 Section 8.6. No Encumbrances                              21
 Section 8.7. Actions to Impair Value of ADA-ES            21
 
 ARTICLE 9.   CERTAIN AGREEMENTS OF THE PARTIES            21
 
 Section 9.1. Tax Matters                                  21
 Section 9.2. Public Announcements                         21
 Section 9.3. Notification of Certain Matters              21
 Section 9.4. Reorganization                               22
 Section 9.5. Shareholder Approval                         22
 Section 9.6. Earth Sciences Disclosure Material.          22
 Section 9.7. Fees and Expenses                            22
 Section 9.8. No Distribution of ADA's Earth Science
                 Common Stock                              22
 Section 9.9. Reasonable Efforts                           22
 Section 9.10.Expiration of Representations and Warranties 23
 
 ARTICLE 10.  CONDITIONS TO THE OPTION CLOSING             23
 
 Section 10.1.Conditions to the Obligations of the
                 Shareholders and Earth Sciences           23
 Section 10.2.Additional Conditions to the Obligations of
                 Earth Sciences                            24
 Section 10.3.Additional Conditions to the Obligations of
                 the Shareholders                          24
 
 ARTICLE 11.  TERMINATION AND ABANDONMENT                  25
 
 Section 11.1.Termination                                  25
 Section 11.2.Procedure and Effect of Termination          26
 
 ARTICLE 12.  INDEMNIFICATION                              26
 
 Section 12.1.Indemnification by the Shareholders.         26
 Section 12.2.Indemnification by Earth Sciences.           26
 Section 12.3.Notice of Claims for Indemnification.        26
 Section 12.4.Securities Law Indemnification; Contribution.27
 
 ARTICLE 13.  GENERAL                                      28
 
 Section 13.1.Amendment and Modification                   28
 Section 13.2.Waiver of Compliance; Consents               28
 Section 13.3.Notices                                      28
 Section 13.4.Assignability and Parties in Interest        30
 Section 13.5.Governing Law                                30
 Section 13.6.Counterparts                                 30
 Section 13.7.Signatures on Behalf of Corporation          30
 Section 13.8.Complete Agreement                           31
 Section 13.9.Interpretation                               31
 Section 13.10.    Severability                             31
 Section 13.11.    Knowledge                                31
 Section 13.12.    Submission to Jurisdiction               31
 Section 13.13.    Arbitration                              31
 
 
 EXHIBITS
 
 Exhibit A         Promissory Note
 Exhibit B         Exercise Notice
 Exhibit C         Certificate of Earth Sciences
 Exhibit D         Certificate of ADA Technologies, Inc.
 Exhibit E         Voting Agreement
 Exhibit F         Registration Rights Agreement
 
 
 SCHEDULES
 
 Schedule 3.5      Financial Statements
 Schedule 3.7      Title and Related Matters
 Schedule 3.8      Intellectual Property
 Schedule 3.9      Litigation
 Schedule 3.10     Insurance Policies and Surety Bonds
 Schedule 3.11     Compliance with Laws
 Schedule 3.17     Contracts and Commitments
 Schedule 5.1      Information Regarding Russ Farmer
 Schedule 6.15(a)  ERISA
 Schedule 10.1(b)  Accrued Incentives

<PAGE>                                        
                                        
                       STOCK OPTION AND EXCHANGE AGREEMENT
                                        
                                        
     This  STOCK OPTION AND EXCHANGE AGREEMENT (this "Agreement")  is  entered
 into as of April 30, 1997, among Earth Sciences, Inc., a Colorado corporation
 ("Earth Sciences"), on the one hand, and ADA-ES, Inc., a Colorado corporation
 ("ADA-ES"),  ADA  Environmental Solutions LLC, a Colorado  limited  liability
 company  ("ADA-LLC"), ADA Technologies, Inc., a Colorado corporation ("ADA"),
 C.  Jean  Bustard, John F. Wurster, Kenneth E. Baldrey and Cameron E.  Martin
 (ADA  and  these  individuals  being  hereinafter  collectively  called   the
 "Shareholders"), on the other hand.
 
 RECITALS:
 
     1.    The  Shareholders own all of the issued and outstanding  shares  of
 Common  Stock of ADA-ES, and ADA-ES owns 95.2% of the membership interest  of
 ADA-LLC.
 
     2.    ADA-ES and ADA-LLC seek funding to accomplish the business plan  as
 set  forth  in  the  document entitled "Business Plan for  ADA  Environmental
 Solutions Flue Gas Conditioning Technology for Cost Effective Enhancement  of
 ESPs  and  Baghouses," dated March 1996 (the "Business  Plan"),  that,  among
 other matters, discusses the use of phosphoric acid for treatment of flue gas
 particulates.
 
      3.     Earth  Sciences'  wholly-owned  subsidiary  intends  to   produce
 phosphoric acid at its facility in Calgary.
 
     4.    Prior  to  the date of this Agreement, Earth Sciences has  invested
 $400,000 in ADA-LLC in exchange for a 4.8% membership interest in ADA-LLC.
 
     5.    Earth Sciences desires to acquire (i) an additional 46.2%  interest
 in  ADA-LLC in exchange for $500,000 in cash and a non-interest bearing  note
 in  the amount of $1,600,000 and (ii) an option to acquire 100% of the equity
 of ADA-ES.
 
     6.    If  and  when  such  option is exercised, Earth  Sciences  and  the
 Shareholders  desire  to exchange 1,715,600 shares of Earth  Sciences  common
 stock, $.01 par value per share (the "Earth Sciences Common Stock"), for  all
 of  the  issued and outstanding shares of ADA-ES (the "Shares") held  by  the
 Shareholders.
 
                                   AGREEMENT:
                                        
     NOW,  THEREFORE, in consideration of the premises and the mutual promises
 contained herein, and other good and valuable consideration, the receipt  and
 sufficiency  of  which are hereby acknowledged, the parties hereto  agree  as
 follows:
 
 
 ARTICLE 1.INVESTMENT AND OPTION GRANTS
 
 Section 1.1. Additional Investment in ADA-LLC.
 
     On  the  Option  Closing Date (as defined below),  Earth  Sciences  shall
 purchase an additional 46.2% membership interest in ADA-LLC from ADA-LLC (the
 "Additional Investment") in exchange for $500,000 in cash and a note  in  the
 amount of $1,600,000 (the "Note") in the form attached hereto as Exhibit A.
 
 Section 1.2. Grant of Option.
 
     On  the  terms  and  subject  to the conditions  set  forth  herein,  the
 Shareholders  hereby grant Earth Sciences an irrevocable option  to  purchase
 all of their Shares in exchange for an aggregate of 1,715,600 shares of Earth
 Sciences Common Stock (the "Option").  The Option shall be exercisable during
 the  period commencing at 12:00 a.m., Denver time, on May 1, 1998 and  ending
 at  11:59 p.m., Denver time, on October 31, 1998 (the "Exercise Period")  and
 may  not be exercised prior to or after the Exercise Period.  The Option  may
 not  be  exercised for fewer than all of the Shares held by the Shareholders.
 Exercise  of  the Option shall be effected by Earth Sciences  giving  written
 notice  to  each  of the Shareholders (the "Exercise Notice")  (in  the  form
 attached  hereto as Exhibit B) which shall state that the Option  is  thereby
 being  exercised.  The Exercise Notice shall be signed by a  duly  authorized
 officer of Earth Sciences.
 
 Section 1.3. Exchange of Shares.
 
     At the Exchange Closing (defined below), each Shareholder shall transfer,
 convey,  assign and deliver to Earth Sciences, free and clear of  all  liens,
 pledges, encumbrances and claims whatsoever, the Shares in exchange  for  the
 Earth  Sciences Common Stock, and Earth Sciences shall accept the  Shares  in
 exchange  for  the  Earth  Sciences  Common  Stock  (the  "Exchange").    The
 Shareholders  shall deliver to Earth Sciences certificates  representing  the
 Shares, duly endorsed for transfer at the Exchange Closing.
 
 Section 1.4. Option Closing.
 
     Subject to the provisions of this Agreement, the additional investment by
 Earth Sciences in ADA-LLC and the grant of the Option as contemplated by this
 Agreement (the "Option Closing") shall take place at the offices of  Baker  &
 Hostetler LLP and be effective as of 10:00 a.m., Denver time, on the date two
 days  after  the  conditions to the Option Closing have been  satisfied  (the
 "Option  Closing  Date").   At the Option Closing,  Earth  Sciences  and  the
 Shareholders  will  deliver  or  cause  to  be  delivered  the  certificates,
 documents and instruments contemplated by Article 10.  All actions taken  and
 all  documents  delivered  at the Option Closing  shall  be  deemed  to  have
 occurred simultaneously.
 
 Section 1.5. Repurchase Options.
 
     (a)   If the Exchange Closing does not occur, if Earth Sciences does  not
 exercise the Option or if Earth Sciences issues the Exercise Notice but fails
 to  consummate  the Exchange within the time frame specified in  Section  2.1
 hereof, ADA-LLC shall have the option from and after November 1, 1998  for  a
 period  of  90 days to repurchase all of the membership interest  in  ADA-LLC
 owned  by  Earth  Sciences  for a purchase price  equal  to  the  total  cash
 contribution  made  by Earth Sciences to ADA-LLC as of  that  date  plus  any
 amount  paid  by Earth Sciences on the Note (the "First Repurchase  Option").
 Within  seven  days after the exercise of the First Repurchase  Option  Earth
 Sciences  shall deliver all of its membership interest in ADA-LLC to ADA-LLC,
 and ADA-LLC shall execute a note in the amount of the repurchase price.  Such
 note  shall  be  paid over a three-year period in equal monthly  installments
 with  interest at a compound rate of 8% per annum and shall be secured (on  a
 basis  reasonably  satisfactory to Earth Sciences) by the ADA-LLC  membership
 interest  repurchased from Earth Sciences by, and then held by, ADA-LLC  (the
 "Repurchase  Note").  Upon the exercise of the First Repurchase  Option,  the
 Note shall be cancelled in full.
 
     (b)   If  Earth Sciences shall default on any payments on the  Note,  the
 Shareholders  may terminate the Option, and, if so terminated, ADA-LLC  shall
 have the option, after such default for a period of 90 days to repurchase all
 of  the membership interest in ADA-LLC owned by Earth Sciences for a purchase
 price  equal to $900,000 plus any amounts paid by Earth Sciences on the  Note
 (the  "Second Repurchase Option").  Within seven days after the  exercise  of
 the  Second  Repurchase  Option, Earth Sciences  shall  deliver  all  of  its
 membership  interest  in ADA-LLC to ADA-LLC, and ADA-LLC  shall  execute  the
 Repurchase  Note (secured as described in subparagraph (a) above.   Upon  the
 exercise  of  the  Second Repurchase Option, the Note shall be  cancelled  in
 full.
 
     (c)   If  the  Option Closing does not occur on or before May  31,  1997,
 Earth  Sciences  shall  have  the option of, on  or  before  June  15,  1997,
 requiring  ADA-LLC to repurchase Earth Sciences' 4.8% membership interest  in
 ADA-LLC  for  a purchase price equal to $400,000 (the "Earth Sciences  Put").
 Within  seven  days  after  the exercise of the  Earth  Sciences  Put,  Earth
 Sciences  shall deliver all of its membership interest in ADA-LLC to ADA-LLC,
 and  ADA-LLC shall execute a note in the amount of the repurchase price. Such
 note  shall be paid over a two year period, commencing no later than May  31,
 1998,  in equal monthly installments with interest at a compound rate  of  8%
 per  annum and shall be secured (on a basis reasonably satisfactory to  Earth
 Sciences) by the ADA-LLC membership interest repurchased from Earth  Sciences
 by, and then held by, ADA-LLC.
 
     (d)   If the Option Closing does not occur before May 31, 1997 and  Earth
 Sciences  has  not, on or before June 15, 1997, exercised the Earth  Sciences
 Put,  ADA-LLC shall have the right, on or before July 15, 1997, to repurchase
 such 4.8% membership interest (the "ADA Call").  Within seven days after  the
 exercise  of the ADA Call, Earth Sciences shall deliver all of its membership
 interest  in  ADA-LLC to ADA-LLC, and ADA-LLC shall execute  a  note  in  the
 amount  of  the repurchase price.  Such note shall be paid over  a  one  year
 period,  commencing no later than May 31, 1998, in equal monthly installments
 with  interest at a compound rate of 8% per annum and shall be secured (on  a
 basis  reasonably  satisfactory to Earth Sciences) by the ADA-LLC  membership
 interest repurchased from Earth Sciences by, and then held by, ADA-LLC.
 
     (e)   The exercise of the options referred to in (a) and (b) above  shall
 be  effective (the "Effective Date") two days after the mailing of the notice
 of  exercise by certified mail, return receipt requested, to the  address  of
 Earth Sciences set forth in Section 12.3(b) hereof.
 
 
 ARTICLE 2.EXCHANGE
 
 Section 2.1. Exchange Closing.
 
     If  Earth  Sciences exercises the Option during the Exercise Period,  the
 consummation  of  the exchange of shares contemplated hereby  (the  "Exchange
 Closing")  shall  occur  at  the offices of Baker  &  Hostetler  LLP  and  be
 effective  as  of 10:00 a.m., Denver time, within 14 days of receipt  by  all
 Shareholders  of the Exercise Notice, or at such other place and/or  on  such
 other  date  as  the parties hereto may agree upon in writing (the  "Exchange
 Closing  Date").   If  the Exchange Closing fails to occur  by  the  Exchange
 Closing  Date,  or by such later date to which the Exchange  Closing  may  be
 extended as provided herein, the Option may be terminated by the Shareholders
 as  described  above;  provided,  however, that  no  such  termination  shall
 constitute a waiver by any party or parties which is not in material  default
 of  any  of  its or their respective representations, warranties or covenants
 herein  of  any rights or remedies it or they might have at law if any  other
 party   or  parties  is  in  default  of  any  of  its  or  their  respective
 representations, warranties or covenants under this Agreement.
 
 Section 2.2. Exchange.
 
      At   the  Exchange  Closing,  Earth  Sciences  will  transfer,  and  the
 Shareholders  will  accept  from  Earth Sciences,  the  aggregate  number  of
 authorized and newly issued shares of Earth Sciences Common Stock  set  forth
 in  Section 2.3 below.  In consideration for the issuance and delivery of the
 Earth  Sciences Common Stock to the Shareholders, and as payment in  full  of
 the  purchase price for the Earth Sciences Common Stock to be issued to  each
 of  the  Shareholders, at the Exchange Closing the Shareholders shall deliver
 to  Earth  Sciences  the certificates evidencing that  respective  number  of
 Shares owned by each Shareholder which is set forth opposite his, her or  its
 name on the signature page hereof.
 
 Section 2.3. Issuance of Earth Sciences Common Stock to Each Shareholder.
 
     Each  Shareholder  shall receive the number of shares of  Earth  Sciences
 Common Stock in the Exchange that is equal to (i) the number of shares of ADA-
 ES  held  by  such  Shareholder divided by the total issued  and  outstanding
 Shares  multiplied by (ii) 1,715,600.  Upon such issuance, any and all shares
 of  Earth Sciences Common Stock issued to the Shareholders as provided herein
 will  be  fully  paid  and nonassessable. No fractions  of  shares  of  Earth
 Sciences  Common Stock shall be issued to the Shareholders.  At the  Exchange
 Closing,  a Shareholder otherwise entitled to receive fractions of shares  of
 Earth  Sciences Common Stock shall receive from Earth Sciences an  amount  in
 cash  equal  to  (i)  the  fractional share to which such  Shareholder  would
 otherwise be entitled, multiplied by (ii) the closing price of one  share  of
 Earth  Sciences Common Stock as quoted on the Nasdaq SmallCap Market  on  the
 date Earth Sciences delivers the Exercise Notice to the Shareholders.
 
 Section 2.4. Earth Sciences Delivery to the Shareholders.
 
     At  the  Exchange  Closing, as conditions thereto, Earth  Sciences  shall
 deliver, or cause to be delivered, to the Shareholders:
 
          (a)   Certificates  for  the shares of Earth Sciences  Common  Stock
 being  received  for their respective accounts and issuable at  the  Exchange
 Closing as provided in this Article 2, in form and substance satisfactory  to
 the Shareholders and their counsel; and
 
          (b)  A certificate on behalf of Earth Sciences substantially in  the
 form of Exhibit C indicating that Earth Sciences has complied with all of the
 covenants set forth in Article 7 hereto and attaching the certified copies of
 resolutions  of Earth Sciences' Board of Directors approving the exercise  of
 the Option.
 
 Section 2.5. Shareholders Delivery to Earth Sciences.
 
     At  the  Exchange Closing, as conditions thereto, the Shareholders  shall
 deliver to Earth Sciences:
 
          (a)  Stock certificates evidencing the ownership of each Shareholder
 of all Shares owned by them, duly endorsed for transfer to Earth Sciences;
 
         (b)  The certificate of ADA substantially in the form of Exhibit D;
 
          (c)   The  minute book and all other corporate records and documents
 of ADA-ES; and
 
         (d)  Executed resignations of all the directors of ADA-ES.
 
 Section 2.6. Further Assurances.
 
     From  time to time after the Exchange Closing, the Shareholders and Earth
 Sciences,  and each of their respective affiliates, will execute and  deliver
 to  the other such instruments of sale, transfer, conveyance, assignment  and
 delivery,  consents, assurances, powers of attorney and other instruments  as
 may be reasonably requested by counsel for Earth Sciences or the Shareholders
 in  order  to  vest in Earth Sciences all right, title and  interest  of  the
 Shareholders  in  and to the Shares and in order to vest in the  Shareholders
 all  right, title and interest in and to the Earth Sciences Common Stock  and
 otherwise to carry out the purpose and intent of this Agreement.
 ARTICLE 3.REPRESENTATIONS AND WARRANTIES OF ADA
    ADA represents and warrants to Earth Sciences that:

 Section 3.1. Organization.

     Each of ADA and ADA-ES is a corporation, duly organized, validly existing
 and  in  good  standing  under the laws of the State  of  Colorado  with  all
 requisite  corporate  power  and authority to  own,  operate  and  lease  its
 properties and to carry on its business as now being conducted, and  is  duly
 qualified  or  licensed  to  do business and is  in  good  standing  in  each
 jurisdiction  in  which its ownership or leasing of property  or  conduct  of
 business  requires such licensing or qualification, except where the  failure
 to  be so qualified would not have a material adverse effect on ADA-ES.  ADA-
 LLC  is a limited liability company, duly organized, validly existing and  in
 good  standing  under the laws of the State of Colorado  with  all  requisite
 power and authority to own, operate and lease its properties and to carry  on
 its business as now being conducted, and is duly qualified or licensed to  do
 business  and is in good standing in each jurisdiction in which its ownership
 or  leasing  of  property or conduct of business requires such  licensing  or
 qualification, except where the failure to be so qualified would not  have  a
 material  adverse  effect on ADA-LLC.  ADA has delivered  to  Earth  Sciences
 complete  and  correct copies of the Articles of Incorporation,  By-Laws  and
 other minute book documents (including stock transfer records) of ADA-ES  and
 the  Articles of Organization, the Operating Agreement and other minute  book
 documents of ADA-LLC, as in effect on the date hereof.
 
 Section 3.2. Authorization.
 
     ADA  has  taken all corporate action necessary to enter into and  perform
 this   Agreement,  except  that  ADA's  shareholders  need  to  approve   the
 transactions contemplated by this Agreement.  The Board of Directors  of  ADA
 has  declared the Option and the Exchange fair to and advisable  and  in  the
 best  interest  of ADA's shareholders.  The Shareholders have  the  requisite
 power  and  authority to enter into this Agreement and  to  carry  out  their
 obligations  hereunder.  Except as represented above  in  this  Section,  the
 execution and delivery by the Shareholders of this Agreement, the performance
 by  the  Shareholders of their obligations hereunder and the consummation  by
 the  Shareholders of the transactions contemplated hereby have, to the extent
 necessary, been duly authorized by the appropriate corporate or other action,
 and  no other proceeding on the part of the Shareholders is necessary for the
 execution  and  delivery  hereof  and the performance  of  their  obligations
 hereunder.  Assuming the valid authorization, execution and delivery of  this
 Agreement  by Earth Sciences and except as represented above in this  Section
 with  respect to ADA, this Agreement is a legal, valid and binding obligation
 of  the Shareholders, ADA-ES and ADA-LLC, enforceable in accordance with  its
 terms,  except  to  the extent enforceability may be limited  by  bankruptcy,
 insolvency, reorganization, moratorium, fraudulent transfer or other  similar
 laws  of  general applicability relating to or affecting the  enforcement  of
 creditors'  rights  and  by  the  effect  of  general  principles  of  equity
 (regardless of whether enforceability is considered in a proceeding in equity
 or at law).
 
 Section 3.3. Capitalization.
 
     All  of the membership interests in ADA-LLC, not owned by Earth Sciences,
 are  owned by ADA-ES, and all of the issued and outstanding shares of  ADA-ES
 are  owned  by the Shareholders.  All of such interests and shares have  been
 duly  and  validly  issued, were not issued in violation  of  any  preemptive
 rights  and are fully paid and non-assessable.  Except as set forth  in  this
 Agreement, there are no options, warrants, subscriptions, conversion or other
 rights,  agreements, commitments, arrangements or understandings with respect
 to  (i)  the  issuance  of  interests in  ADA-LLC  or  any  other  securities
 convertible  into, exchangeable for or evidencing the right to subscribe  for
 any such interests in ADA-LLC or (ii) the issuance of shares of capital stock
 of  ADA-ES  or  any  other securities convertible into, exchangeable  for  or
 evidencing the right to subscribe for any such shares in ADA-ES.
 
 Section 3.4. Consents and Approvals; No Violations.
 
     Neither the execution, delivery or performance of this Agreement  by  the
 Shareholders  nor  the consummation of the transactions  contemplated  hereby
 will  (i)  conflict  with or result in any breach of any  provisions  of  the
 Articles  of  Incorporation or By-laws of ADA or ADA-ES or  the  Articles  of
 Organization or the Operating Agreement of ADA-LLC, (ii) require  any  filing
 with,  or  permit, authorization, consent or approval of, any court, arbitral
 tribunal,  administrative agency or commission unless the failure  to  obtain
 such  permits, authorizations, consents or approvals or to make such  filings
 would  not  prevent  consummation of the Exchange and  would  not,  to  ADA's
 knowledge,  individually or in the aggregate, have a material adverse  effect
 on  ADA,  ADA  -ES or ADA-LLC, (iii) result in a violation or breach  of,  or
 constitute  (with or without due notice or lapse of time or both)  a  default
 (or  give  rise  to  any  right  of termination, amendment,  cancellation  or
 acceleration)  under,  or  result  in the  creation  of  any  lien  or  other
 encumbrance  on any property or asset of ADA, ADA-ES or ADA-LLC pursuant  to,
 any  of  the  terms,  conditions or provisions of any note,  bond,  mortgage,
 indenture,  lease,  license,  contract,  agreement  or  other  instrument  or
 obligation to which any of ADA, ADA-ES or ADA-LLC is a party or by which  any
 of them or their properties or assets may be bound or (iv) violate any order,
 writ,  injunction, decree, statute, rule or regulation applicable to  any  of
 ADA,  ADA-ES or ADA-LLC or by which any property or asset of any of  them  is
 bound,  except,  in  the  case of clauses (iii)  and  (iv),  for  violations,
 breaches,  defaults or other occurrences which would not prevent consummation
 of  the  Exchange  and would not, in the aggregate, have a  material  adverse
 effect on ADA, ADA-ES or ADA-LLC.
 
 Section 3.5. Financial Statements.
 
     The  financial  statements  of ADA-ES and  ADA-LLC,  included  herein  as
 Schedule  3.5,  have  been  prepared in accordance  with  generally  accepted
 accounting  principles,  applied on a consistent  basis  during  the  periods
 involved  (except  as may be indicated therein or in the notes  thereto)  and
 fairly  present the financial position of ADA-ES and ADA-LLC as at the  dates
 thereof and the results of their operations and changes in financial position
 for the periods then ended (subject, in the case of unaudited statements,  to
 normal  year-end  audit  adjustments and to any other  adjustments  described
 therein).  There is no liability or obligation of any kind, whether  accrued,
 absolute,  fixed or contingent, of ADA-ES or ADA-LLC  which  is  required  by
 generally accepted accounting principles to be reflected or reserved  against
 or  otherwise disclosed in the financial statements in Schedule 3.5 of ADA-ES
 and ADA-LLC, which is not so reflected or reserved against, that individually
 or  in the aggregate would have a material adverse effect on ADA-ES and  ADA-
 LLC.  Except  as  set forth in Schedule 3.5 hereto, there has  not  been  any
 material adverse change with respect to ADA-ES or ADA-LLC since the dates  of
 such financial statements, and ADA, ADA-ES and ADA-LLC have not incurred  any
 material  obligation or liability of any kind outside of the ordinary  course
 of business since the dates of such financial statements except as previously
 disclosed to Earth Sciences.
 
 Section 3.6. Taxes.
 
     Each  of ADA, ADA-ES and ADA-LLC has filed on a timely basis all material
 tax  returns required to have been filed by it and has paid on a timely basis
 all  material taxes required to be shown thereon.  All such tax returns  were
 true, complete and correct in all material respects.  Each of ADA, ADA-ES and
 ADA-LLC  has  made  adequate  provision  for  all  material  taxes  in  their
 respective  financial statements and in their respective accounting  records.
 No  material liability for taxes has been incurred by  ADA, ADA-ES or ADA-LLC
 other than in the ordinary course of business.   None of ADA, ADA-ES nor ADA-
 LLC has received notice of any pending or threatened action that could result
 in  a  liability  for  taxes  in excess of those shown  in  their  respective
 financial  statements.   None of ADA, ADA-ES nor ADA-LLC has received  notice
 that  any  taxing authority has commenced or intends to commence an audit  or
 other  examination  with  respect to taxes or tax returns,  or  has  asserted
 against  ADA, ADA-ES or ADA-LLC any deficiency or claim for additional taxes,
 and no material issues have been raised by any taxing authority that have not
 been finally settled. None of ADA, ADA-ES nor ADA-LLC is a party to an income
 tax  allocation or sharing agreement with respect to a group of  corporations
 filing tax returns on a combined, consolidated or unitary basis.  ADA-LLC  is
 treated as a partnership for tax purposes.
 
 Section 3.7. Title and Related Matters.
 
     ADA-ES  and  ADA-LLC have good and valid title to all of  their  material
 assets reflected on the financial statements of ADA-ES and ADA-LLC (and which
 are listed on Schedule 3.7 hereto), and all such material assets are free and
 clear of material claims, burdens or rights of other persons.
 
 Section 3.8. Patents, Trademarks and Other Intellectual Property.
 
     Except  as set forth in Schedule 3.8, ADA-ES and ADA-LLC possess or  have
 the  right  to use, to the extent they are now using, all proprietary  rights
 (including, without limitation, patents, trade secrets, technology, know-how,
 copyrights, trademarks, trade names and rights to any of the foregoing),  the
 failure  to possess which would have a material adverse effect on  ADA-ES  or
 ADA-LLC  or  would prevent either from carrying on its business  ("Subsidiary
 Proprietary  Rights"), and the consummation of the transactions  contemplated
 hereby  will not alter or impair any such rights.  Set forth in Schedule  3.8
 is  a list of all Subsidiary Proprietary Rights consisting of patents, patent
 applications,  trademarks, trademark applications, trade  names  and  service
 marks  owned or utilized by ADA-ES and ADA-LLC.  Schedule 3.8 also lists  all
 licenses or other contracts related thereto.  With respect to such Subsidiary
 Proprietary Rights, and except as set forth in Schedule 3.8, none of ADA, ADA-
 ES  or  ADA-LLC  has  knowledge  (i) of any  claim  asserted  by  any  person
 challenging  such Subsidiary Proprietary Rights which could have  a  material
 adverse  effect on its business, (ii) that any of the Subsidiary  Proprietary
 Rights infringes or otherwise violates any valid rights of others or is being
 infringed  by  others, and (iii) of, except for sales  and  licenses  in  the
 ordinary   course  of  business,  any  licenses,  sublicenses  or  agreements
 pertaining to any of the Subsidiary Proprietary Rights granted by ADA, ADA-ES
 or ADA-LLC.
 
 Section 3.9. Litigation.
 
     Except  as set forth in Schedule 3.9, there is no Proceeding (as  defined
 below)  pending  or,  to  the  knowledge of the executive  officers  of  ADA,
 threatened  against ADA, ADA-ES or ADA-LLC before or by any  federal,  state,
 municipal or other governmental department, commission, board, bureau, agency
 or  instrumentality,  domestic or foreign, or before any  arbitrator  of  any
 kind, that would have a material adverse effect on ADA, ADA-ES or ADA-LLC or,
 with  respect to such matters that are pending or threatened as of  the  date
 hereof,  materially impair the ability of ADA, ADA-ES or ADA-LLC  to  perform
 its  obligations  hereunder  or to consummate the  transactions  contemplated
 hereby,  and there is no judgment, decree, injunction, rule or order  of  any
 court,   governmental   department,  commission,   board,   bureau,   agency,
 instrumentality or arbitrator to which ADA, ADA-ES, ADA-LLC or any  of  their
 Subsidiaries is subject that would have a material adverse effect on ADA, ADA-
 ES  or  ADA-LLC  or,  with  respect to such items that  are  outstanding  and
 applicable as of the date hereof, materially impair the ability of ADA,  ADA-
 ES  or  ADA-LLC  to perform their obligations hereunder or to consummate  the
 transactions  contemplated hereby.  As used in this  Agreement,  "Proceeding"
 means  any  action, suit, hearing, arbitration or governmental  investigation
 (whether public or private).
 
 Section 3.10.Insurance and Surety Bonds.
 
     All  material  policies  of fire, liability, workmen's  compensation  and
 other similar forms of insurance and surety bonds owned or held by ADA,  ADA-
 ES  or ADA-LLC (copies of which have been provided to Earth Sciences) are  in
 full  force and effect, and no notice of cancellation or termination has been
 received with respect to any such policy.  Such policies and bonds are valid,
 outstanding  and  enforceable policies, and except as set forth  in  Schedule
 3.10,  will  not  be  affected by, or terminate or lapse by  reason  of,  the
 transactions contemplated by this Agreement.
 
 Section 3.11.Compliance with Laws.
 
     ADA,  ADA-ES and ADA-LLC have complied in all material respects with  the
 laws and regulations of federal, state, local and foreign governments and all
 agencies thereof which are applicable to the business or properties  of  ADA,
 ADA-ES  and  ADA-LLC, except for violations of which would not  result  in  a
 material  adverse effect on ADA, ADA-ES or ADA-LLC.  ADA, ADA-ES and  ADA-LLC
 hold  such  licenses, permits, consents, authorizations and  orders  of  such
 governmental  or regulatory authorities as are necessary to  carry  on  their
 respective businesses as currently being conducted and as anticipated  to  be
 conducted  (a  list of applicable licenses, permits, consents, authorizations
 and  orders are set forth on Schedule 3.11 hereto), the failure to hold which
 could  have  a  material adverse effect on ADA, ADA-ES or ADA-LLC,  and  such
 licenses, permits, consents, authorizations and orders are in full force  and
 effect  and have been and are being complied with by ADA, ADA-ES and  ADA-LLC
 in all material respects.
 
 Section 3.12.Employee Benefit Plans.
 
      Neither  ADA-ES nor ADA-LLC nor any entity that together with either  of
 ADA-ES  or ADA-LLC is treated as a single employer pursuant to Section 414(b)
 or  (c) of the Internal Revenue Code of 1986 (the "Code") or Section 3(5)  or
 4001(b)  of  the Employee Retirement Income Security Act of 1974, as  amended
 ("ERISA"), maintains or in the past has maintained any Employee Benefit Plan,
 as  defined  in  Section  3(3) of ERISA, under which any  present  or  former
 employee  of  either ADA-ES or ADA-LLC has any present or  future  rights  to
 benefits.
 
 Section 3.13.Employment Related Agreements.
 
     Neither  ADA-ES nor ADA-LLC has ever had any employees or is a  party  to
 any  bonus,  profit  sharing, stock option, incentive,  pension,  retirement,
 deferred compensation, consulting, severance, indemnification, employment  or
 similar  arrangement  or  agreement  with officers,  directors,  managers  or
 employees of ADA-ES or ADA-LLC.
 
 Section 3.14.Labor Agreements and Controversies.
 
     Neither  ADA-ES  nor  ADA-LLC  is a party to  any  collective  bargaining
 agreement  nor  are  there  any  union representation  proceedings  or  labor
 controversies pending or, to the knowledge of ADA, threatened against  either
 ADA-ES or ADA-LLC.
 
 Section 3.15.Environmental Matters.
 
     ADA,  ADA-ES and ADA-LLC are in material compliance with all laws, rules,
 regulations  and  other legal requirements relating to the  environment,  and
 ADA,  ADA-ES  and ADA-LLC possess all material permits, licenses and  similar
 authorizations required thereunder.  There is no physical condition  existing
 on  any  property  owned  or operated by ADA-ES or ADA-LLC  or  any  physical
 conditions  existing  on any other property that may have  been  impacted  by
 operation of their businesses which could reasonably be expected to give rise
 to  any  material remedial obligation under any environmental  law  or  which
 could reasonably be expected to result in any material liability to any third
 party  claiming  damage to person or property as a result or  consequence  of
 said physical conditions.
 
 <PAGE>
 Section 3.16.Certain Fees.
 
     No broker, investment broker or other person is entitled to any broker's,
 finder's  or  other  similar  fee  or  commission  in  connection  with   the
 transactions contemplated by this Agreement based upon arrangements  made  by
 or on behalf of the Shareholders.
 
 Section 3.17.Contracts and Commitments.
 
     Except  as  set  forth on Schedule 3.17 or on another  Schedule  to  this
 Agreement,  neither ADA-ES nor ADA-LLC is, at the date of this  Agreement,  a
 party to any written or oral
 
            (a)  contract with any labor union,
 
             (b)   bonus, pension, profit-sharing, retirement, stock purchase,
 stock  option,  hospitalization, insurance or similar plan  relating  to  any
 employees of ADA-ES, ADA-LLC or their Subsidiaries,
 
            (c)  employment contract, consulting contract or retainer,
 
             (d)   lease  with  respect  to any property,  real  or  personal,
 whether as lessor or lessee,
 
             (e)   loan agreement or other instrument relating to indebtedness
 for borrowed money,
 
             (f)   contract  or  arrangement  for  insurance,  including  life
 insurance  and  fidelity  bonds  covering officers  or  employees  or  agents
 including,  without  restricting  the  generality  of  the  foregoing,  those
 covering their respective properties, buildings, machinery, equipment,  furni
 ture, fixtures and operations,
 
             (g)   contract  containing covenants by ADA-ES,  ADA-LLC  or  any
 other person not to compete in any line of business,
 
               (h)    patent,   patent   application,   trademark,   trademark
 registration  or  application therefor, trade name, copyright,  or  copyright
 registration  or application therefor, or any patent, trademark or  copyright
 license or agreement,
 
            (i)  joint venture agreements,
 
            (m)  distributorship, agency or brokerage contracts, or
 
            (n)  any other material contract.
 
 ADA  has furnished or made available to Earth Sciences the original or a true
 and  complete copy of each document (or a summary of the material  provisions
 in  the event a formal document does not exist) referred to in Schedule 3.17.
 Neither  ADA-ES nor ADA-LLC nor, to ADA's knowledge, any other party  thereto
 is  in  default, nor, but for a requirement that notice be given  or  that  a
 period  of  time  elapse,  or  both, would  ADA-ES,  ADA-LLC,  or,  to  ADA's
 knowledge,  any  other party thereto be in default, in any material  respect,
 under any contract or commitment referred to above.
 
 <PAGE>
 Section 3.18.   No Other Representations.
 
      ADA is not making any representation or warranty, express or implied, of
 any nature whatsoever, except as specifically set forth in this Agreement.
 
 
 ARTICLE 4.REPRESENTATIONS AND WARRANTIES OF OTHER SHAREHOLDERS
 
      Each  of  the  Shareholders,  other than ADA,  represents  and  warrants
 severally to Earth Sciences that:
 
 Section 4.1.    Authorization.
 
      Such  Shareholder  has  taken all action necessary  to  enter  into  and
 perform  this  Agreement.   Such Shareholder  has  the  requisite  power  and
 authority  to  enter into this Agreement and to carry out  his,  her  or  its
 obligations  hereunder.   Assuming  the valid  authorization,  execution  and
 delivery  of this Agreement by Earth Sciences and the other Shareholders  and
 except  as represented above with respect to ADA, this Agreement is a  legal,
 valid  and  binding obligation of such Shareholder, enforceable in accordance
 with  its  terms,  except  to the extent enforceability  may  be  limited  by
 bankruptcy,  insolvency, reorganization, moratorium, fraudulent  transfer  or
 other  similar  laws of general applicability relating to  or  affecting  the
 enforcement  of creditors' rights and by the effect of general principles  of
 equity (regardless of whether enforceability is considered in a proceeding in
 equity or at law).
 
 Section 4.2.    Shares.
 
      To the best of such Shareholder's knowledge, all of the Shares owned  by
 such  Shareholder  have  been duly and validly issued,  were  not  issued  in
 violation  of  any  preemptive rights and are fully paid and  non-assessable.
 Such  Shareholder  holds no options, warrants, subscriptions,  conversion  or
 other  rights,  agreements, commitments, arrangements or understandings  with
 respect  to  the issuance of shares of capital stock of ADA-ES or  any  other
 securities  convertible  into, exchangeable for or evidencing  the  right  to
 subscribe  for  any such shares in ADA-ES.  Such Shareholder  is  the  lawful
 owner,  of  record and beneficially, of the number of Shares set forth  below
 his,  her or its name on the signature page hereto and has, and will transfer
 to  Earth  Sciences at the Exchange Closing, if Earth Sciences exercises  the
 Option,  good  and  marketable title to such Shares, free and  clear  of  any
 security  interests, liens, pledges, claims, charges, escrows,  encumbrances,
 options,  rights of first refusal, mortgages, indentures, security agreements
 or  other agreements, arrangements, contracts, commitments, understandings or
 obligations, whether written or oral and whether or not relating in  any  way
 to  credit  or  the  borrowing  of  money  ("Encumbrances").   There  are  no
 restrictions  on  the  voting rights and the other incidents  of  record  and
 beneficial  ownership  pertaining  thereto.   There  are  no  agreements   or
 understandings between any Shareholder and any other Shareholder or any other
 person  with respect to the voting of any of the Shares or any other  matters
 affecting the Shares.
 
 <PAGE>
 Section 4.3.    Consents and Approvals; No Violations.
 
      Neither the execution, delivery or performance of this Agreement by such
 Shareholder  nor  the  consummation by such Shareholder of  the  transactions
 contemplated  hereby  will  require, with respect to  such  Shareholder,  any
 filing  with,  or permit, authorization, consent or approval of,  any  court,
 arbitral tribunal, administrative agency or commission.
 
 Section 4.4.    No Other Representations.
 
      Such  Shareholder is not making any representation or warranty,  express
 or  implied,  of any nature whatsoever, except as specifically set  forth  in
 this Agreement.
 
 
 ARTICLE 5.INVESTMENT REPRESENTATIONS OF THE SHAREHOLDERS
 
 Section 5.1.    Purchaser Representative.
 
      Each  Shareholder represents and warrants that he, she or  it  has  duly
 appointed  Russ  Farmer (the "Purchaser Representative") to  serve  as  their
 purchaser representative in connection with their evaluation of the risks and
 merits  of  granting the Option to Earth Sciences pursuant to this  Agreement
 and  their potential acquisition of Earth Sciences Common Stock in connection
 with  an  exercise  of  the  Option.  Each Shareholder  also  represents  and
 warrants  that  the Shareholder, together with the Purchaser  Representative,
 has  the requisite knowledge and experience in financial and business matters
 for  properly evaluating the risks of an investment in Earth Sciences.   Each
 Shareholder acknowledges that the Purchaser Representative will be reimbursed
 by   ADA  for  any  expenses  in  connection  with  such  appointment.   Each
 Shareholder  also  acknowledges  that  he,  she  or  it  is  aware   of   the
 transactions,  listed on Schedule 5.1, that have occurred  between  Purchaser
 Representative and ADA, ADA-ES and ADA-LLC.
 
 Section 5.2.    State of Residence or Business.
 
      Each  Shareholder who is an individual represents and warrants that  the
 Shareholder is a resident of the State of Colorado.  Each Shareholder that is
 a corporation represents and warrants that its principal place of business is
 located in the State of Colorado.
 
 Section 5.3.    Tax Consequences.
 
       Each   Shareholder  represents  and  warrants  that   the   Shareholder
 understands  that  Earth  Sciences has made  no  representation  or  warranty
 regarding the tax consequences to any Shareholder of the Exchange.
 
 Section 5.4.    Investment Intent.
 
      Each  Shareholder  represents and warrants  that  the  Shareholder  will
 acquire the Earth Sciences Common Stock issuable to the Shareholder upon  the
 exercise  of  the  Option  solely  for  the  Shareholder's  own  account  for
 investment  and not with a view to or for sale or distribution of  the  Earth
 Sciences  Common  Stock  or  any portion thereof and  not  with  any  present
 intention  of  selling,  offering  to  sell  or  otherwise  disposing  of  or
 distributing  the Earth Sciences Common Stock or any portion thereof  in  any
 transaction, other than a transaction registered under the Securities Act  of
 1933,  as  amended (the "Securities Act"), or a transaction exempt  from  the
 registration  requirements under the Securities Act.  Each  Shareholder  also
 represents  that  the  entire  legal and beneficial  interest  of  the  Earth
 Sciences Common Stock the Shareholder may acquire would be acquired for,  and
 would  be held for the account of, the Shareholder only and neither in  whole
 nor in part for any other person.
 
 Section 5.5.    Transfer Restrictions.
 
       Each   Shareholder  represents  and  warrants  that   the   Shareholder
 understands that:
 
      (a)     neither  the sale of the Earth Sciences Common Stock  which  the
 Shareholder  may  acquire  nor  the shares of  Earth  Sciences  Common  Stock
 themselves  have  been  registered under the  Securities  Act  or  any  state
 securities  laws,  and  the  Earth  Sciences  Common  Stock  must   be   held
 indefinitely unless subsequently registered under the Securities  Act  or  an
 exemption from such registration is available; and
 
      (b)     the  share  certificate representing the Earth  Sciences  Common
 Stock  will be stamped with the following legend (or substantially equivalent
 language) restricting transfer:
 
      "The securities represented by this certificate have not been registered
 under  the  Securities Act of 1933 or the laws of any  state  and  have  been
 issued  pursuant  to  an  exemption  from  registration  pertaining  to  such
 securities  and  pursuant to a representation by the  security  holder  named
 hereon that said securities have been acquired for purposes of investment and
 not for purposes of distribution.  These securities may not be offered, sold,
 transferred, pledged or hypothecated in the absence of registration,  or  the
 availability of an exemption from such registration.  Furthermore, no  offer,
 sale,  transfer, pledge or hypothecation is to take place without  the  prior
 written  approval of counsel to the issuer being affixed to this certificate.
 The  stock  transfer agent has been ordered to effectuate transfers  of  this
 certificate only in accordance with the above instructions."
 
 Section 5.6.    Ability to Accept Risk of Investment.
 
      EACH  SHAREHOLDER REPRESENTS AND WARRANTS THAT SUCH SHAREHOLDER REALIZES
 THAT  SHAREHOLDER'S ACQUISITION OF THE EARTH SCIENCES COMMON STOCK WILL BE  A
 HIGHLY SPECULATIVE INVESTMENT AND THAT SHAREHOLDER IS ABLE, WITHOUT IMPAIRING
 THE  SHAREHOLDER'S  FINANCIAL CONDITION, TO HOLD THE  EARTH  SCIENCES  COMMON
 STOCK  FOR AN INDEFINITE PERIOD OF TIME AND TO SUFFER A COMPLETE LOSS OF  THE
 SHAREHOLDER'S INVESTMENT.
 
 Section 5.7.    Review of Earth Sciences Documents.
 
      Each  Shareholder acknowledges that, to such Shareholder's  satisfaction
 and the satisfaction of the Purchaser Representative, (i) the Shareholder and
 Purchaser  Representative have either had access to or  have  been  furnished
 with   all  the  information  regarding  Earth  Sciences  (including  without
 limitation Earth Sciences' Form 10-KSB for the year ended December  31,  1996
 filed  with the Securities and Exchange Commission (the "SEC")) and the terms
 of  Shareholder's potential investment in Earth Sciences to the  satisfaction
 of Shareholder and the Purchaser Representative, (ii) the Shareholder and the
 Purchaser Representative have discussed the entire investment transaction and
 the  information described in clause (i) above with representatives of  Earth
 Sciences,  (iii) the Shareholder and the Purchaser Representative  have  been
 provided   the  opportunity  to  ask  questions  concerning  this  investment
 transaction and the terms and conditions thereof and all such questions  have
 been  answered  to  the  satisfaction of the Shareholder  and  the  Purchaser
 Representative,  (iv) the Shareholder and the Purchaser  Representative  have
 obtained  all additional information which they deem necessary to verify  the
 accuracy of the information previously disclosed or provided to them and  (v)
 the Shareholder and the Purchaser Representative have had ready access to and
 an  opportunity to review any and all documents which they deem  relevant  to
 this  transaction,  and  no  information, oral or  written,  that  they  have
 requested has been withheld by Earth Sciences.
 
 Section 5.8.    Restricted Securities.
 
       Each   Shareholder  represents  and  warrants  that  such   Shareholder
 understands  that the Earth Sciences Common Stock he, she or it  may  receive
 will  be  restricted  securities within the meaning of Rule  144  promulgated
 under the Securities Act; that the exemption from registration under Rule 144
 will  not  be available in any event for at least one year from the  date  of
 acquisition of the Earth Sciences Common Stock by such Shareholder, and  even
 then will not be available unless (i) a public trading market then exists for
 the  Earth Sciences Common Stock, (ii) adequate information concerning  Earth
 Sciences is then available to the public and (iii) other terms and conditions
 of Rule 144 are complied with; and that any sale of the Earth Sciences Common
 Stock  may  be made by such Shareholder only in limited amounts in accordance
 with such terms and conditions.
 
 Section 5.9.    Disposition of Earth Sciences Common Stock.
 
      Without in any way limiting the Shareholder's representations set  forth
 above,  each  Shareholder further agrees that such Shareholder  shall  in  no
 event make any disposition of all or any portion of the Earth Sciences Common
 Stock which such Shareholder may acquire unless and until:
 
      (a)     there  is  then  in effect a registration  statement  under  the
 Securities  Act  covering such proposed disposition, and such disposition  is
 made in accordance with said registration statement; or
 
      (b)     (i) such Shareholder shall have notified Earth Sciences  of  the
 proposed  disposition and shall have furnished Earth Sciences with a detailed
 statement  of  the  circumstances surrounding the proposed disposition,  (ii)
 such  Shareholder  shall have furnished Earth Sciences  with  an  opinion  of
 Shareholder's  own  counsel  to the effect that  such  disposition  will  not
 require  registration of such shares under the Securities Act and (iii)  such
 opinion of such Shareholder's counsel shall have been reasonably concurred in
 by  counsel  for  Earth  Sciences,  and Earth  Sciences  shall  have  advised
 Shareholder of such concurrence.
 
 
 ARTICLE 6.REPRESENTATIONS AND WARRANTIES OF EARTH SCIENCES
 
     Earth Sciences represents and warrants to the Shareholders that:
 
 Section 6.1.    Organization, Standing and Power.
 
      Earth Sciences is a corporation duly incorporated, validly existing  and
 in  good  standing  under  the laws of the State  of  Colorado  and  has  the
 requisite corporate power and authority to carry on its business as now being
 conducted.  Earth Sciences is duly qualified to do business, and is  in  good
 standing, in each jurisdiction where the character of its properties owned or
 held  under  lease  or the nature of its activities makes such  qualification
 necessary,   except  where  the  failure  to  be  so  qualified  would   not,
 individually  or  in the aggregate, have a material adverse effect  on  Earth
 Sciences.
 
 Section 6.2.    Capital Structure.
 
      The  authorized capital stock of Earth Sciences consists  of  25,000,000
 shares of Earth Sciences Common Stock.  At the close of business on April 18,
 1997,  (i)  8,620,071 shares of Earth Sciences Common Stock were  issued  and
 outstanding, (ii) 739,000 shares of Earth Sciences Common Stock were reserved
 for  issuance  upon  the exercise of then outstanding  Earth  Sciences  stock
 options, (iii) 69,900 shares of Earth Sciences Common Stock were reserved for
 issuance  upon exercise of Earth Sciences stock options which may be  granted
 in  the future under currently existing stock option plans, (iv) 1,224 shares
 of  Earth  Sciences Common Stock were held by Earth Sciences in its  treasury
 and  (v)  4,979,824 shares of Earth Sciences Common Stock were  reserved  for
 issuance  upon the conversion of conversion rights or convertible securities.
 The  number  of  shares  reserved  for  convertible  securities  includes  an
 estimated  4,616,667  shares reserved for issuance  upon  the  conversion  of
 convertible debentures (the "Debentures") and represents a sufficient  number
 of shares for an average conversion rate of $1.27 per share.  Under the terms
 of  the  Debentures, Earth Sciences may be required to issue  further  shares
 under certain market conditions.
 
      All  outstanding shares of capital stock of Earth Sciences  are  validly
 issued,  fully  paid and nonassessable and not subject to preemptive  rights.
 Except  as  set forth above, as of the date of this Agreement, there  are  no
 options,   warrants,   rights,  commitments,  agreements,   arrangements   or
 undertakings of any kind to which Earth Sciences is a party or by which it is
 bound  obligating Earth Sciences to issue, deliver or sell, or  cause  to  be
 issued, delivered or sold, additional shares of capital stock or other voting
 securities of Earth Sciences.
 
 Section 6.3.    Authority; Non-Contravention.
 
      The  Board of Directors of Earth Sciences has declared the Exchange fair
 to  and  advisable  and  in the best interest of the  shareholders  of  Earth
 Sciences  (the  "Earth  Sciences  Shareholders").   Earth  Sciences  has  all
 requisite  power and authority to enter into this Agreement and to consummate
 the  transactions  contemplated hereby.  No approval by the  shareholders  of
 Earth  Sciences  is  required  in connection with  any  of  the  transactions
 contemplated hereby.  The execution and delivery of this Agreement  by  Earth
 Sciences   and  the  consummation  by  Earth  Sciences  of  the  transactions
 contemplated  hereby  have been duly authorized by  all  necessary  corporate
 action  on the part of Earth Sciences.  This Agreement has been duly executed
 and  delivered  by  Earth  Sciences and (assuming  the  valid  authorization,
 execution  and delivery of this Agreement by the Shareholders) constitutes  a
 valid  and  binding  obligation of Earth Sciences enforceable  against  Earth
 Sciences  in  accordance with its terms, except to the extent  enforceability
 may   be  limited  by  bankruptcy,  insolvency,  reorganization,  moratorium,
 fraudulent  transfer or other similar laws of general applicability  relating
 to  or  affecting the enforcement of creditors' rights and by the  effect  of
 general  principles  of  equity  (regardless  of  whether  enforceability  is
 considered in a proceeding in equity or at law).  The execution and  delivery
 of   this  Agreement  do  not,  and  the  consummation  of  the  transactions
 contemplated  hereby  and  compliance with the provisions  hereof  will  not,
 conflict  with,  or result in any violation of, or default (with  or  without
 notice  or  lapse  of  time, or both) under, or  give  rise  to  a  right  of
 termination, cancellation or acceleration of any obligation or to the loss of
 a  material  benefit under, or result in the creation of any  lien,  security
 interest, charge or encumbrance upon any of the properties or assets of Earth
 Sciences under, any provision of (i) the Certificate of Incorporation or  By-
 laws  of  Earth Sciences (true and complete copies of which as  of  the  date
 hereof  have  been delivered to the Shareholders), (ii) any  loan  or  credit
 agreement,  note,  bond,  mortgage,  indenture,  lease  or  other  agreement,
 instrument,  permit,  concession, franchise or license  applicable  to  Earth
 Sciences or (iii) any judgment, order, decree, statute, law, ordinance,  rule
 or  regulation  applicable  to  Earth  Sciences  or  any  of  its  respective
 properties  or assets, other than, in the case of clauses (ii) or (iii),  any
 such   conflicts,  violations,  defaults,  rights,  liens,  losses,  security
 interests,  charges or encumbrances that, individually or in  the  aggregate,
 would not have a material adverse effect on Earth Sciences, materially impair
 the ability of Earth Sciences to perform its obligations hereunder or prevent
 the  consummation of any of the transactions contemplated hereby.  No  filing
 or   registration  with,  or  authorization,  consent  or  approval  of,  any
 governmental  entity  is required by or with respect  to  Earth  Sciences  in
 connection  with  the  execution and delivery  of  this  Agreement  by  Earth
 Sciences  or  is  necessary for the consummation by  Earth  Sciences  of  the
 Exchange  and  the other transactions contemplated by this Agreement,  except
 for  (i)  in  connection,  or  in compliance,  with  the  provisions  of  the
 Securities Act, and the Securities Exchange Act of 1934 (the "Exchange Act"),
 (ii) such filings as may be required in connection with applicable taxes, and
 (iii)  such other consents, approvals, orders, authorizations, registrations,
 declarations  and filings the failure of which to be obtained or  made  would
 not,  individually  or in the aggregate, have a material  adverse  effect  on
 Earth  Sciences, materially impair the ability of Earth Sciences  to  perform
 its  obligations  hereunder  or  prevent  the  consummation  of  any  of  the
 transactions contemplated hereby.
 
 Section 6.4.    SEC Documents.
 
      Earth Sciences has filed all required documents with the SEC (the "Earth
 Sciences  SEC Documents").  As of their respective dates, the Earth  Sciences
 SEC  Documents complied in all material respects with the requirements of the
 Securities  Act,  or the Exchange Act, as the case may be, and  none  of  the
 Earth  Sciences SEC Documents, as of its date, contained any untrue statement
 of  a material fact or omitted to state a material fact required to be stated
 therein or necessary in order to make the statements therein, in light of the
 circumstances  under  which  they were made, not misleading.   The  financial
 statements  of  Earth Sciences included in the Earth Sciences  SEC  Documents
 comply  as  to  form  in  all  material respects with  applicable  accounting
 requirements and the published rules and regulations of the SEC with  respect
 thereto,  have been prepared in accordance with generally accepted accounting
 principles (except, in the case of unaudited statements, as permitted by Form
 10-QSB  of the SEC) applied on a consistent basis during the periods involved
 (except  as  may  be  indicated therein or in the notes thereto)  and  fairly
 present the financial position of Earth Sciences as at the dates thereof  and
 the  results of operations and changes in financial position for the  periods
 then  ended (subject, in the case of unaudited statements, to normal year-end
 audit adjustments and to any other adjustments described therein).  There  is
 no  liability or obligation of any kind, whether accrued, absolute, fixed  or
 contingent,  of  Earth  Sciences of which the  executive  officers  of  Earth
 Sciences   have  knowledge  and  which  is  required  by  generally  accepted
 accounting  principles  to  be  reflected or reserved  against  or  otherwise
 disclosed in the most recent financial statements of Earth Sciences  included
 in  the  Earth Sciences SEC Documents which is not so reflected  or  reserved
 against  that individually or in the aggregate would have a material  adverse
 effect on Earth Sciences.
 
 Section 6.5.    Earth Sciences Disclosure Material.
 
      The Earth Sciences Disclosure Material (defined below) will not, at  the
 time  of  the  ADA  Shareholder Meeting and the  ADA-ES  Shareholder  Meeting
 (defined below), contain any untrue statement of a material fact or  omit  to
 state  any material fact required to be stated therein or necessary in  order
 to make the statements therein, in the light of the circumstances under which
 they are made, not misleading.
 
 Section 6.6.    Absence of Material Adverse Change.
 
      Except  as  specifically disclosed in the Earth Sciences  SEC  Documents
 filed  with the SEC prior to the date hereof, there has not been any material
 adverse change with respect to Earth Sciences.
 
 Section 6.7.    Reorganization.
 
      To  the  knowledge of Earth Sciences, Earth Sciences has not  taken  any
 action  or  failed to take any action which action or failure to take  action
 would jeopardize the qualification of the Exchange as a reorganization within
 the  meaning  of  Section  368(a)(1)(B) of  the  Code  (a  "Reorganization");
 provided,  however, Earth Sciences makes no representation or  warranty  that
 the  Exchange will qualify as a reorganization within the meaning of  Section
 368(a)(1)(B) of the Code.
 
 Section 6.8.    Tax Representations.
 
      All material tax returns required to be filed by Earth Sciences (the "ES
 Tax  Returns") have been filed or extensions have been obtained.  The ES  Tax
 Returns are true and correct in all material respects and have been completed
 in all material respects in accordance with applicable laws.  All taxes shown
 to be due on the ES Tax Returns have been timely paid or extensions have been
 duly  obtained,  or  such taxes have been adequately provided  for  on  Earth
 Sciences'  latest  balance sheet or are being timely and properly  contested.
 Earth  Sciences has not waived any statute of limitations in respect of taxes
 of  Earth  Sciences.   No  issues that have been raised  in  writing  by  the
 relevant  taxing authority in connection with the examination of the  ES  Tax
 Returns are currently pending.  All deficiencies asserted or assessments made
 as  a  result of any examination of the ES Tax Returns by a taxing  authority
 have  been paid in full or adequately provided for on Earth Sciences'  latest
 balance sheet or are being timely and properly contested.  Earth Sciences  is
 not a party to an income tax allocation or sharing agreement with respect  to
 a  group  of  corporations filing tax returns on a combined, consolidated  or
 unitary basis.
 
 Section 6.9.    Title and Related Matters.
 
      Earth Sciences has good title to all of the material assets reflected on
 the financial statements of Earth Sciences included in the Earth Sciences SEC
 Documents  as  being  owned by it and all of the material  assets  thereafter
 acquired  by  it (except to the extent that such assets have thereafter  been
 disposed  of  in  the  ordinary  course  of  business  consistent  with  past
 practice), subject to no material liens, except for (i) liens for  taxes  not
 yet  delinquent  or the validity of which is being contested in  good  faith,
 (ii)  any  liens  arising by operation of law securing  obligations  not  yet
 overdue, (iii) liens disclosed in Earth Sciences SEC Documents and (iv) liens
 otherwise specifically disclosed in writing to the Shareholders.
 
 Section 6.10.   Agreements.
 
      Earth Sciences is not bound by any material contract (as defined in Item
 601(b)(10) of SEC Regulation S-K) to be performed after the date hereof  that
 has  not  been filed with or incorporated by reference in the Earth  Sciences
 SEC  Documents  filed  with the SEC prior to the date of  this  Agreement  or
 otherwise specifically disclosed in writing to the Shareholders.
 
 Section 6.11.   Litigation.
 
      Except  as disclosed prior to the date hereof in the Earth Sciences  SEC
 Documents,  there  is  no  Proceeding pending or, to  the  knowledge  of  the
 executive  officers  of  Earth Sciences, threatened  against  Earth  Sciences
 before  or by any federal, state, municipal or other governmental department,
 commission, board, bureau, agency or instrumentality, domestic or foreign, or
 before  any arbitrator of any kind, that would have a material adverse effect
 on  Earth  Sciences  or, with respect to such matters  that  are  pending  or
 threatened  as  of  the date hereof, materially impair the ability  of  Earth
 Sciences   to  perform  its  obligations  hereunder  or  to  consummate   the
 transactions   contemplated  hereby,  and  there  is  no  judgment,   decree,
 injunction,  rule or order of any court, governmental department, commission,
 board,  bureau, agency, instrumentality or arbitrator to which Earth Sciences
 or  any  of  its  Subsidiaries is subject that would have a material  adverse
 effect  on Earth Sciences or, with respect to such items that are outstanding
 and  applicable as of the date hereof, materially impair the ability of Earth
 Sciences   to  perform  its  obligations  hereunder  or  to  consummate   the
 transactions contemplated hereby.
 
 Section 6.12.   Patents, Trademarks and Other Intellectual Property.
 
      Earth Sciences possesses or has the right to use to the extent it is now
 using, all proprietary rights (including, without limitation, patents,  trade
 secrets, technology, know-how, copyrights, trademarks, trade names and rights
 to  any of the foregoing), the failure to possess which would have a material
 adverse  effect  on Earth Sciences or would prevent it from carrying  on  its
 business  ("ES Proprietary Rights"), and the consummation of the transactions
 contemplated  hereby will not alter or impair any such rights.  With  respect
 to  such  ES Proprietary Rights, Earth Sciences has no knowledge (i)  of  any
 claim  asserted  by any person challenging such ES Proprietary  Rights  which
 could have a material adverse effect on its business, (ii) that any of the ES
 Proprietary Rights infringes or otherwise violates the rights of others or is
 being  infringed  by others and (iii) except for sales and  licenses  in  the
 ordinary   course  of  business,  no  licenses,  sublicenses  or   agreements
 pertaining  to  any of the ES Proprietary Rights have been granted  by  Earth
 Sciences.
 
 Section 6.13.   Insurance and Surety Bonds.
 
      All  material  policies of fire, liability, workmen's  compensation  and
 other forms of insurance and surety bonds owned or held by Earth Sciences are
 in  full  force and effect, and no notice of cancellation or termination  has
 been  received with respect to any such policy.  Such policies and bonds  are
 valid,  outstanding and enforceable policies and will not be affected by,  or
 terminate  or  lapse  by  reason of, the transactions  contemplated  by  this
 Agreement.   Such  policies and surety bonds, and  such  other  policies  and
 reserves  added since such date, provide, to the knowledge of Earth Sciences,
 insurance  coverage that is adequate for the assets and operations  of  Earth
 Sciences.   Earth Sciences has been and is covered by insurance in scope  and
 amount customary and reasonable for the business in which it is engaged.
 
 Section 6.14.   Compliance with Laws.
 
      Earth  Sciences has complied in all material respects with the laws  and
 regulations of federal, state, local and foreign governments and all agencies
 thereof which are applicable to the business or properties of Earth Sciences,
 except  for violations of which would not result in a material adverse effect
 on  Earth  Sciences.  Earth Sciences hold such licenses,  permits,  consents,
 authorizations  and orders of such governmental or regulatory authorities  as
 are  necessary to carry on its business as currently being conducted  and  as
 anticipated to be conducted, the failure to hold which could have a  material
 adverse  effect  on  Earth  Sciences, and such licenses,  permits,  consents,
 authorizations and orders are in full force and effect and have been and  are
 being fully complied with by Earth Sciences.
 
 Section 6.15.   Employee Benefit Plans.
 
      (a)     Except  as  set  forth in Schedule 6.15(a),  (i)  neither  Earth
 Sciences  nor an ERISA Affiliate maintains or in the past has maintained  any
 Employee  Benefit Plan, as defined in Section 3(3) of ERISA, under which  any
 present or former employee of Earth Sciences has any present or future rights
 to  benefits, (ii) to its knowledge each such Employee Benefit Plan has  been
 administered in accordance with the applicable material requirements of ERISA
 and  the  Code,  (iii) to its knowledge all material reports and  information
 required  to  be  filed with the United States Department of Labor,  Internal
 Revenue  Service or Pension Benefit Guaranty Corporation, or  distributed  to
 participants  and  their beneficiaries with respect  to  each  such  Employee
 Benefit Plan, has been timely filed or distributed and, with respect to  each
 Employee  Benefit Plan for which an Annual Report has been filed,  no  change
 has  occurred with respect to the matters covered by the Annual Report  since
 the  date  of  the most recent such Annual Report which could  reasonably  be
 expected  to have a material adverse effect on Earth Sciences and (iv)  there
 have been no non-exempt "prohibited transactions" (as that term is defined in
 the  Code or in ERISA) with respect to any such Employee Benefit Plan and  no
 material  penalty or tax under ERISA or the Code has been imposed upon  Earth
 Sciences  and  there  are  no  pending  or,  to  Earth  Sciences'  knowledge,
 threatened claims by or on behalf of any such Employee Benefit Plan,  by  any
 employee  or beneficiary covered by such Employee Benefit Plan, or  otherwise
 involving such Employee Benefit Plan, other than claims for benefits  in  the
 ordinary course.
 
      (b)     Each  such  Employee Benefit Plan which is an "employee  pension
 benefit  plan,"  as defined in ERISA and which is intended to be  "qualified"
 within  the  meaning  of Section 401(a) of the Code, is so  qualified  and  a
 favorable  determination  letter  has been issued  by  the  Internal  Revenue
 Service with respect to the prototype of such plan and no such prototype plan
 has  been amended since the issuance of the most recent determination  letter
 issued  by  the  Internal  Revenue Service with  respect  thereto.   No  such
 Employee Benefit Plan is subject to Title IV of ERISA or Section 412  of  the
 Code.
 
 <PAGE>
 Section 6.16.   Environmental Matters.
 
       Earth  Sciences  is  in  material  compliance  with  all  laws,  rules,
 regulations and other legal requirements relating to the environment.   Earth
 Sciences possesses all material permits, licenses, and similar authorizations
 required thereunder.  There is no physical condition existing on any property
 owned  or  operated by Earth Sciences or any physical conditions existing  on
 any  other property that may have been impacted by operation of its  business
 which  could  reasonably be expected to give rise to  any  material  remedial
 obligation under any environmental law or which could reasonably be  expected
 to  result  in any material liability to any third party claiming  damage  to
 person or property as a result or consequence of said physical conditions.
 
 Section 6.17.   Certain Fees.
 
      No  broker,  investment  banker  or other  person  is  entitled  to  any
 broker's, finder's or other similar fee or commission in connection with  the
 transactions contemplated by this Agreement based upon arrangements  made  by
 or on behalf of Earth Sciences.
 
 Section 6.18.   No Other Representations.
 
      Earth Sciences is not making any representation or warranty, express  or
 implied, of any nature whatsoever, except as specifically set forth  in  this
 Agreement.
 
 
 ARTICLE 7.COVENANTS OF EARTH SCIENCES PRIOR TO THE EXCHANGE CLOSING
 
 
      Upon the execution and delivery of this Agreement, Earth Sciences hereby
 covenants that, prior to and at the Exchange Closing:
 
 Section 7.1.    Operation in Usual Manner; Access for the Shareholders.
 
      Earth  Sciences shall (i) continue to conduct its business in its  usual
 manner  and  (ii) give the Shareholders' representatives full access,  during
 normal  business hours, and upon reasonable notice, to all of Earth Sciences'
 assets,  properties, books, records, agreements and commitments  and  furnish
 the   Shareholders'  representatives  during  such  period  with   all   such
 information  concerning  Earth Sciences as the  Shareholders  may  reasonably
 request;  provided, however, that any furnishing of such information  to  the
 Shareholders  or any investigation by the Shareholders shall not  affect  the
 Shareholders'  right to rely on the representations and  warranties  made  by
 Earth   Sciences  in  this  Agreement,  and,  provided  further,   that   the
 Shareholders  will  hold in strict confidence all documents  and  information
 concerning Earth Sciences so furnished, and, if the transactions contemplated
 in  this  Agreement  shall  not  be consummated,  such  confidence  shall  be
 maintained and all such documents shall immediately thereafter be returned to
 Earth Sciences.
 
 Section 7.2.    Corporate Existence, Rights and Franchises.
 
      Earth  Sciences  shall take all necessary actions to  maintain  in  full
 force  and  effect  its  corporate existence,  rights,  franchises  and  good
 standing.
 
 <PAGE>
 Section 7.3.    Nasdaq Listing.
 
      Earth Sciences shall take all actions necessary to ensure that the Earth
 Sciences Common Stock is quoted on the Nasdaq SmallCap Market.
 
 Section 7.4.    Corporate Action and Consents.
 
      Earth  Sciences shall take all necessary corporate and other action  and
 use  its best efforts to obtain all consents and approvals required to enable
 it to carry out the transactions contemplated by this Agreement.
 
 Section 7.5.    Conditions to be Satisfied.
 
      Earth Sciences shall use its best efforts to cause all the conditions to
 the  obligations  of the Shareholders under this Agreement  to  be  satisfied
 prior to the Exchange Closing.
 
 Section 7.6.    Regulatory Approvals.
 
      Earth  Sciences shall take all necessary actions to obtain any  and  all
 permits, approvals and qualifications of, and there shall have been  made  or
 completed  all  filings, proceedings and waiting periods,  required  by,  any
 governmental  body, agency or regulatory authority which, in  the  reasonable
 opinion  of counsel to the Shareholders are required for the consummation  of
 the  transactions contemplated hereby and the operation of Earth Sciences for
 its intended purpose.
 
 Section 7.7.    Additional Funding and Payment to ADA.
 
      (a)     The  additional funding needed to pay the Note  is  or  will  be
 available to Earth Sciences at the times required; and
 
      (b)    On April 30, 1997 and on June 30, 1997, (i) $400,000 and (ii)  an
 amount  not  to  exceed $380,000, respectively, will be  used  to  repay  all
 outstanding  indebtedness  owed  by ADA-LLC to  ADA  incurred  for  operating
 expenses  of  ADA-LLC.  Earth Sciences agrees to cause ADA-LLC to  make  such
 payments.
 
 Section 7.8.    Seat on Earth Sciences Board of Directors.
 
      Earth Sciences shall use its best efforts to make available one seat  on
 the   Earth  Sciences  Board  of  Directors  for  a  representative  of   the
 Shareholders between the Option Closing and the Exchange Closing and  for  so
 long  thereafter  as, in the aggregate, the Shareholders  own  no  less  than
 1,000,000  shares  of  Earth  Sciences Common Stock.   Earth  Sciences  shall
 nominate  an  individual  designated  by  the  Shareholders  for  such  seat,
 provided,  however,  that such individual shall agree to  recuse  himself  or
 herself  from any matters relating to the decision whether or not to exercise
 the  Option.   Management  shareholders of Earth Sciences  shall  enter  into
 voting  agreements, substantially in the form of Exhibit E, agreeing to  vote
 their  shares  of  Earth  Sciences Common Stock in favor  of  one  individual
 designated by the Shareholders for such seat.
 
 Section 7.9.    Tax-Free Exchange.
 
      Subject  to  the  proviso to the first sentence of Section  6.7  hereof,
 Earth  Sciences  will not take any action or fail to take  any  action  which
 action  or  failure  to take action, to its knowledge, would  jeopardize  the
 qualification of the Exchange as a Reorganization.
 
 <PAGE>
 Section 7.10.   Guarantee of Leases.
 
      Earth  Sciences  shall  use its best efforts to execute  and  deliver  a
 guaranty  of all leases for operating equipment used by ADA-LLC and currently
 guaranteed  by ADA.  Earth Sciences shall use its best efforts to  make  such
 guaranty  effective on the Option Closing and, after the Option  Closing,  to
 provide  that  ADA shall be released from all obligations under  its  current
 guaranty of such leases.
 
 
 ARTICLE  8.COVENANTS OF ADA AND THE OTHER SHAREHOLDERSPRIOR TO  THE  EXCHANGE
 CLOSING
 
      ADA  and  the  other  Shareholders  (except  as  otherwise  specifically
 indicated below) hereby covenant that from the date hereof until and  at  the
 Exchange Closing:
 
 Section 8.1.    Operation in Usual Manner; Access for Earth Sciences .
 
      ADA  will  cause  ADA-ES and ADA-LLC to (i) continue  to  conduct  their
 business  in  their  usual manner, except as otherwise contemplated  by  this
 Agreement  and (ii) give Earth Sciences' representatives full access,  during
 normal  business hours, and upon reasonable notice, to all of  ADA-LLC's  and
 ADA-ES's  assets, properties, books, records, agreements and commitments  and
 furnish  Earth  Sciences' representatives during such period  with  all  such
 information  concerning ADA-LLC and ADA-ES as Earth Sciences  may  reasonably
 request; provided, however, that any furnishing of such information to  Earth
 Sciences  or  any  investigation by Earth Sciences  shall  not  affect  Earth
 Sciences' right to rely on the representations and warranties made by ADA and
 the  Shareholders  in  this  Agreement, and,  provided  further,  that  Earth
 Sciences  will  hold  in  strict  confidence all  documents  and  information
 concerning  ADA-ES  and  ADA-LLC  so  furnished,  and,  if  the  transactions
 contemplated  in  this  Agreement shall not be consummated,  such  confidence
 shall  be  maintained and all such documents shall immediately thereafter  be
 returned to ADA-ES or ADA-LLC.
 
 Section 8.2.    Existence, Rights and Franchises.
 
      The  Shareholders and current officers, directors and managers of ADA-ES
 and  ADA-LLC shall each take all necessary actions to cause their  respective
 entity to maintain in full force and effect its corporate or other existence,
 rights, franchises and good standing and shall not cause or permit to be made
 any  change  in  the  Articles  or  Bylaws  of  ADA-ES  or  the  Articles  of
 Organization   or  Operating  Agreement  of  ADA-LLC,  except  as   otherwise
 contemplated by this Agreement.
 
 Section 8.3.    Action and Consents.
 
      ADA  and the Shareholders shall take all necessary action and use  their
 respective  best  efforts to obtain all consents and  approvals  required  to
 enable  the Shareholders to carry out the transactions contemplated  by  this
 Agreement.
 
 Section 8.4.    Conditions to be Satisfied.
 
      ADA  and  the  Shareholders shall use their respective best  efforts  to
 cause  all  the  conditions to the obligations of Earth Sciences  under  this
 Agreement to be satisfied prior to the Exchange Closing.
 
 <PAGE>
 Section 8.5.    Regulatory Approvals.
 
      ADA  and the Shareholders shall take all necessary actions to cause ADA-
 ES  and  ADA-LLC  to obtain any and all permits, approvals and qualifications
 of,  and there shall have been made or completed all filings, proceedings and
 waiting  periods  required by, any governmental body,  agency  or  regulatory
 authority  which, in the reasonable opinion of counsel to Earth Sciences  are
 required for the consummation of the transactions contemplated hereby and the
 operation of ADA-ES and ADA-LLC for their intended purpose.
 
 Section 8.6.    No Encumbrances.
 
      The  ADA-ES  Shareholders shall keep the Shares free and  clear  of  any
 Encumbrances.
 
 Section 8.7.    Actions to Impair Value of ADA-ES.
 
        The    Shareholders  covenant  to  cause  ADA-ES,  and  ADA-ES  hereby
 covenants,  not to (i) acquire or dispose of any material asset,  (ii)  incur
 any  material  indebtedness or other obligation, (iii) make any distributions
 on  its capital stock or (iv) issue any securities or take any other material
 action  which  would  materially  impair  the  value  of  ADA-ES  (except  as
 previously disclosed).
 
 
 ARTICLE 9.CERTAIN AGREEMENTS OF THE PARTIES
 
 Section 9.1.    Tax Matters.
 
      After the Option Closing, Earth Sciences and each Shareholder shall make
 available  to  the  other  parties  hereto,  as  reasonably  requested,   all
 information,  records  or documents relating to the liability  for  taxes  of
 Earth  Sciences,  ADA-ES, ADA-LLC and the Shareholders with  respect  to  the
 transactions contemplated hereby and shall preserve such information, records
 or documents until the expiration of any applicable statute of limitations or
 extensions thereof.
 
 Section 9.2.    Public Announcements.
 
      Earth Sciences and the Shareholders shall consult with each other before
 issuing  any  press  release or otherwise making any public  statements  with
 respect  to this Agreement or the transactions contemplated hereby  and  will
 not  issue any such press release or make any such public statement prior  to
 such  consultation. Notwithstanding the foregoing, the Shareholders and Earth
 Sciences shall not be prohibited from issuing any press release or making any
 public  statement as may be required under applicable law, but, in  any  such
 event,  the Shareholders or Earth Sciences, as the case may be, shall  notify
 the other party prior to taking such action.
 
 Section 9.3.    Notification of Certain Matters.
 
      Earth  Sciences  and the Shareholders shall give prompt  notice  to  one
 another  of  (i) prior to the Option Closing, the occurrence, or  failure  to
 occur,  of any event which occurrence or failure would or would be likely  to
 cause any of their respective representations or warranties contained in this
 Agreement  to  be untrue or inaccurate in any material respect  or  would  or
 would  likely  cause any condition to become impossible to fulfill  and  (ii)
 prior  to the Exchange Closing, any failure on their part or on the  part  of
 any  of  their respective officers, directors, employees, representatives  or
 agents to comply with or satisfy any covenant, condition or agreement  to  be
 complied  with or satisfied by them under this Agreement; provided,  however,
 that   no   such   notification  will  alter   or   otherwise   affect   such
 representations, warranties, covenants, conditions or agreements.
 
 Section 9.4.    Reorganization.
 
      (a)     Intention  of  Parties.  The parties intend  that  the  Exchange
 qualify as a Reorganization.
 
      (b)    Books, Records and Tax Information.  Both prior to and after  the
 Exchange Closing Date, all books and records will be maintained, and all  tax
 returns and schedules thereto will be filed, in a manner consistent with  the
 Exchange being treated as a Reorganization.  Each party will provide to  each
 other  party such tax information, reports, returns or schedules  as  may  be
 reasonably required to assist such party in accounting for and reporting  the
 Exchange as a Reorganization.
 
      (c)     Actions  by Parties.  During the period from the  date  of  this
 Agreement  through  the  Exchange Closing Date, unless  otherwise  agreed  in
 writing, none of the parties to this Agreement shall knowingly take  or  fail
 to  take  any  action  which action or failure to act  would  jeopardize  the
 treatment  of the Exchange as a reorganization within the meaning of  Section
 368(a)(1)(B) of the Code.
 
 Section 9.5.    Shareholder Approval.
 
      ADA  shall promptly call a meeting of the shareholders of ADA (the  "ADA
 Shareholder  Meeting")  for  the purpose of  voting  upon  the  Exchange  and
 Additional  Investment and shall use its reasonable best  efforts  to  obtain
 shareholder approval of the Exchange and Additional Investment.  ADA-ES shall
 promptly  call  a  meeting  of  the  shareholders  of  ADA-ES  (the   "ADA-ES
 Shareholder  Meeting")  for  the  purpose  of  voting  upon  the   Additional
 Investment and the terms and conditions of the Exchange.  The ADA Shareholder
 Meeting  and  the  ADA-ES  Shareholder Meeting  shall  be  held  as  soon  as
 practicable,  and  ADA  and ADA-ES will, through their respective  Boards  of
 Directors, recommend to their shareholders the approval of such matters.
 
 Section 9.6.    Earth Sciences Disclosure Material.
 
      Earth Sciences shall provide ADA in a timely manner with Earth Sciences'
 Annual Report on Form 10-KSB for the fiscal year ended December 31, 1996, and
 other  recent  reports and registration statements filed with  the  SEC  (the
 "Earth Sciences Disclosure Material") for mailing to the ADA Shareholders and
 the  ADA-ES  Shareholders  in  connection with their  respective  shareholder
 meetings.
 
 Section 9.7.    Fees and Expenses.
 
      Whether  or  not  the Exchange is consummated, all  costs  and  expenses
 incurred  in connection with this Agreement and the transactions contemplated
 hereby shall be paid by the party incurring such costs and expenses.
 
 Section 9.8.    No Distribution of ADA's Earth Science Common Stock.
 
      For  a period of one year following the Exchange Closing, ADA shall  not
 distribute  any  shares  of  Earth  Sciences  Common  Stock  held  by  it  to
 shareholders of ADA.
 
 Section 9.9 No Material Changes.
 
      For a period of one year following the Option Closing, ADA shall not (i)
 dissolve or liquidate, (ii) distribute or dispose of a substantial portion of
 its  assets  outside the ordinary course of its business or (iii)  incur  any
 material  liabilities outside the ordinary course of its business,  provided,
 however,  that ADA may take any action described in this Section 9.9  outside
 the  ordinary  course  of its business so long as ADA  receives  the  written
 consent  of  Earth  Sciences  to such action,  which  consent  shall  not  be
 unreasonably withheld.
 
 Section 9.10.   Reasonable Efforts.
 
      Upon  the  terms  and  subject  to the  conditions  set  forth  in  this
 Agreement, each of the parties agrees to use all reasonable efforts to  take,
 or  cause  to be taken, all actions, and to do, or cause to be done,  and  to
 assist  and  cooperate with the other parties in doing, all things necessary,
 proper or advisable to consummate and make effective, in the most expeditious
 manner  practicable, the Exchange and the other transactions contemplated  by
 this  Agreement  and  the  prompt  satisfaction  of  the  conditions  hereto,
 including (a) the obtaining of all necessary actions or non-actions, waivers,
 consents  and  approvals from governmental entities and  the  making  of  all
 necessary registrations and filings and the taking of all reasonable steps as
 may  be necessary to obtain an approval or waiver from, or to avoid an action
 or proceeding by, any governmental entity, (b) the obtaining of all necessary
 consents, approvals or waivers from third parties, (c) the defending  of  any
 lawsuits  or  other  legal proceedings, whether judicial  or  administrative,
 challenging   this   Agreement  or  the  consummation  of  the   transactions
 contemplated  hereby,  including  seeking  to  have  any  stay  or  temporary
 restraining  order entered by any court or other governmental entity  vacated
 or  reversed and (d) the execution and delivery of any additional instruments
 necessary to consummate the transactions contemplated by this Agreement.
 
 Section 9.11.   Expiration of Representations and Warranties.
 
      The  respective representations and warranties contained herein  and  in
 any  other document or instrument delivered by or on behalf of Earth Sciences
 or the Shareholders shall survive the Option Closing for a period of one full
 year  and  thereupon expire and be of no further force and  effect.   Nothing
 contained  in  this  Section shall in any way affect any obligations  of  any
 party under this Agreement that are to be performed, in whole or in part,  at
 any time after the Option Closing, nor shall it prevent or preclude any party
 from  pursuing any and all available remedies at law or in equity for  actual
 fraud  in  the event that, prior to the Option Closing, any other  party  had
 actual  knowledge  of  any material breach of any of its representations  and
 warranties  herein  but  failed to disclose to  or  actively  concealed  such
 knowledge prior to the Option Closing from the other party(ies) to  whom  the
 representations and warranties were made.
 
 
 ARTICLE 10.CONDITIONS TO THE OPTION CLOSING
 
 Section  10.1.   Conditions to the Obligations of the Shareholders and  Earth
 Sciences.
 
      The  respective  obligations of the Shareholders and Earth  Sciences  to
 effect  the  Option Closing are subject to fulfillment at  or  prior  to  the
 Option Closing Date of the following conditions:
 
      (a)     ADA-LLC  shall have entered into employment  contracts  for  the
 continued  employment  of  certain  individuals,  satisfactory  in  form  and
 substance to the Shareholders and Earth Sciences.
 
      (b)     Earth  Sciences shall have entered into a contract  pursuant  to
 which  it satisfies certain accrued incentives listed on Schedule 10.1(b)  by
 issuance  of  36,305 shares of Earth Sciences Common Stock. The  issuance  of
 such  shares  of  Earth  Sciences  Common Stock  shall  be  registered  on  a
 registration  statement on Form S-8 filed with the SEC within 40  days  after
 the Option Closing.
 
      (c)     No  order,  statute, rule, regulation,  executive  order,  stay,
 decree,  judgment,  or injunction shall have been enacted,  entered,  issued,
 promulgated  or  enforced  by  any  court  or  governmental  authority  which
 prohibits or restricts the effectuation of the Option Closing.
 
      (d)    No governmental action or proceeding shall have been commenced or
 threatened seeking any injunction, restraining or other order which seeks  to
 prohibit,  restrain, invalidate or set aside the effectuation of  the  Option
 Closing.
 
      (e)     All  consents required for the consummation of the  transactions
 contemplated by this Agreement shall have been obtained.
 
 Section 10.2.   Additional Conditions to the Obligations of Earth Sciences.
 
      The  obligations of Earth Sciences to effect the Option Closing are also
 subject  to  the fulfillment at or prior to the Option Closing  Date  of  the
 following additional conditions:
 
      (a)     The  Shareholders  shall  have performed  and  complied  in  all
 material  respects  with  the agreements and obligations  contained  in  this
 Agreement that are required to be performed and complied with by them  at  or
 prior to the Option Closing Date.
 
      (b)     The representations and warranties of the Shareholders contained
 in  this Agreement shall be true and correct in all material respects  as  of
 the  date hereof and shall be deemed to have been made again at and as of the
 Option  Closing  Date  and  shall then be true and correct  in  all  material
 respects.
 
      (c)     All  actions  on  the  part  of the  Shareholders  necessary  to
 authorize the execution, delivery and performance of this Agreement  and  the
 consummation  of the transactions contemplated hereby or thereby  shall  have
 been duly and validly taken.
 
      (d)     Earth Sciences shall have received such certificates of officers
 of  ADA-ES and ADA-LLC and such certificates of others to evidence compliance
 with the conditions set forth in this Section 10.2 and in Section 10.1 as may
 be reasonably requested by Earth Sciences.
 
      (e)    Earth Sciences shall agree, in its reasonable judgment, that  the
 nature  and prospects of ADA-LLC are, in all material respects, as set  forth
 in  the  Business  Plan and financial statements that have been  provided  to
 Earth  Sciences, and that there has been no material adverse change  in  ADA-
 LLC's business from what is set forth therein.
 
      (f)     Earth  Sciences  shall have received an  opinion  from  Baker  &
 Hostetler, LLP, counsel to ADA-ES and ADA-LLC, dated the Option Closing Date,
 in form and substance reasonably satisfactory to Earth Sciences.
 
      (g)     The Shareholders and Earth Sciences shall have entered  into  an
 agreement providing for certain registration rights for the shares  of  Earth
 Sciences  Common  Stock  issuable pursuant to  this  Agreement  in  the  form
 attached hereto as Exhibit F (the "Registration Rights Agreement").
 
 Section   10.3.     Additional  Conditions  to   the   Obligations   of   the
 Shareholders.
 
      The  obligations  of the Shareholders to effect the Option  Closing  are
 also subject to the fulfillment at or prior to the Option Closing Date of the
 following additional conditions:
 
      (a)     Earth Sciences shall have performed and compiled in all material
 respects with the agreements and obligations contained in this Agreement that
 are  required  to  be performed and compiled with by it at or  prior  to  the
 Option Closing Date.
 
      (b)    The representations and warranties of Earth Sciences contained in
 this  Agreement shall be true and correct in all material respects as of  the
 date  hereof  and shall be deemed to have been made again at and  as  of  the
 Option  Closing  Date  and  shall then be true and correct  in  all  material
 respects.
 
      (c)    All corporate actions on the part of Earth Sciences necessary  to
 authorize the execution, delivery and performance of this Agreement  and  the
 consummation of the transactions contemplated hereby and thereby  shall  have
 been duly and validly taken.
 
      (d)     The  Shareholders  shall  have  received  such  certificates  of
 officers  of  Earth  Sciences and such certificates  of  others  to  evidence
 compliance with the conditions set forth in this Section 10.3 and in  Section
 10.1 as may be reasonably requested by the Shareholders.
 
      (e)    ADA shall agree, in its reasonable judgment, that the nature  and
 prospects  of Earth Sciences are, in all material respects, as set  forth  in
 Earth Sciences'  1996 Annual Report on Form 10-KSB, and other materials  that
 have  been  or  may be provided to ADA, and that there has been  no  material
 adverse change in Earth Sciences' business from what is set forth therein.
 
      (f)     The  Shareholders shall have received an  opinion  from  Parcel,
 Mauro,  Hultin & Spaanstra, PC, counsel to Earth Sciences, dated  the  Option
 Closing  Date,  in  form  and  substance  reasonably  satisfactory   to   the
 Shareholders.
 
      (g)     The Shareholders and Earth Sciences shall have entered into  the
 Registration Rights Agreement.
 
      (h)     Earth Sciences shall have caused Michael D. Durham to be elected
 to the Board of Directors of Earth Sciences.
 
 
 ARTICLE 11.TERMINATION AND ABANDONMENT
 
 Section 11.1.   Termination.
 
      The transactions contemplated herein may be terminated and abandoned  at
 any time prior to the Option Closing:
 
      (a)     after 30 days after the date of execution and delivery  of  this
 Agreement  by the Shareholders or Earth Sciences, if the Option  Closing  has
 not  occurred  for  any reason other than a breach of this Agreement  by  the
 terminating party;
 
      (b)    by Earth Sciences, if there has been a material breach by any  of
 the  Shareholders of any agreement, representation or warranty  contained  in
 this  Agreement, which has rendered the satisfaction of any condition to  the
 obligations of Earth Sciences impossible and such breach has not been  waived
 in  writing by Earth Sciences, which would have a material and adverse effect
 on  the  financial  condition, business or operations of ADA-ES  or  ADA-LLC,
 taken as a whole, on a going forward basis;
 
      (c)    by the Shareholders, if there has been a material breach by Earth
 Sciences  of  any  agreement, representation or warranty  contained  in  this
 Agreement  which  has  rendered the satisfaction  of  any  condition  to  the
 obligations  of  the  Shareholders impossible and such breach  has  not  been
 waived  in  writing  by the Shareholders, which would  have  a  material  and
 adverse  effect  on the financial condition, business or operation  of  Earth
 Sciences, on a going forward basis;
 
      (d)     by  Earth Sciences or the Shareholders, if a court of  competent
 jurisdiction  or  governmental,  regulatory  or  administrative   agency   or
 commission  shall have issued an order, decree or ruling or taken  any  other
 action (which Earth Sciences and the Shareholders agree to use all reasonable
 efforts  to  terminate), in each case permanently restraining,  enjoining  or
 otherwise prohibiting the Option Closing; and
 
     (e)    by mutual consent of Earth Sciences and all of the Shareholders.
 
 Section 11.2.   Procedure and Effect of Termination.
 
      In  the  event  of  termination  and  abandonment  of  the  transactions
 contemplated herein by Earth Sciences or the Shareholders pursuant to Section
 11.1,  written notice thereof shall forthwith be given to the other and  this
 Agreement shall terminate and the transactions contemplated herein  shall  be
 abandoned,   without  further  action  by  either  Earth  Sciences   or   the
 Shareholders.  If this Agreement is terminated as provided herein there shall
 be no liability or further obligation hereunder on the part of Earth Sciences
 or the Shareholders, except as set forth in this Section 11.2 and in Articles
 12  and 13 and except that the options specified in Section 1.5 shall survive
 any  such termination.  Nothing in this Section 11.2 shall relieve any  party
 to this Agreement of liability for breach of this Agreement.
 
 
 ARTICLE 12.INDEMNIFICATION
 
 Section 12.1.   Indemnification by the Shareholders.
 
      The  Shareholders severally agree to indemnify and hold  Earth  Sciences
 harmless against and in respect of (a) any and all damages resulting from any
 misrepresentation, breach of representation or warranty or nonfulfillment  of
 any  agreement on the part of the Shareholders under this Agreement  or  from
 any  misrepresentations in or omission from any certificate furnished by  the
 Shareholders  hereunder;  and  (b) any and all actions,  suits,  proceedings,
 demands,   assessments,  judgments,  costs  and  other  expenses   (including
 reasonable legal fees) incident to any of the foregoing.
 
 Section 12.2.   Indemnification by Earth Sciences.
 
      Earth  Sciences  agrees to indemnify and hold each of  the  Shareholders
 harmless against and in respect of (a) any and all damages resulting from any
 misrepresentation, breach of any representation or warranty or nonfulfillment
 of  any agreement on the part of Earth Sciences under this Agreement or  from
 any misrepresentations in or omission from any certificate furnished by Earth
 Sciences hereunder; and (b) any and all actions, suits, proceedings, demands,
 assessments, judgments, costs and other expenses (including reasonable  legal
 fees) incident to the foregoing.
 
 Section 12.3.   Notice of Claims for Indemnification.
 
      Notice  of  any  claims  desired  to be  asserted  by  a  party  seeking
 indemnification  ("Indemnitee") against the other party  ("Indemnitor")  with
 respect to any matter for which Indemnitee claims indemnification pursuant to
 this  Section 12 shall be served by Indemnitee upon the Indemnitor  promptly.
 Any  such notice shall set forth in reasonable detail the basis for the claim
 asserted.   Within  20  days  following  its  receipt  of  such  notice,  the
 Indemnitor shall send written notice to the Indemnitee stating:
 
             (a)   Whether  in  its  view  the claim  is  one  for  which  the
 Indemnitee is entitled to indemnification (a "Covered Claim"), and
 
             (b)  If it acknowledges that the claim is a Covered Claim whether
 they  chooses to dispute its validity by participating in any defense of  any
 action brought by a third party with respect to such claim.
 
 If  the  Indemnitor fails to furnish such notice within such  20-day  period,
 such failure shall constitute its agreement that the claim is a Covered Claim
 and  its  election  not to participate in the defense of any  action  on  the
 Claim.
 
       If   Indemnitor  fails  to  furnish  such  notice  or  states  in  such
 notification  that the claim is not a Covered Claim or that  it  declines  to
 dispute  the validity of said claim, the Indemnitee may defend or settle  the
 claim  without the participation of Indemnitor, reserving any rights it might
 have  with respect to indemnification.  If Indemnitor acknowledges  that  the
 claim  is  a Covered Claim, then Indemnitor may participate, at its own  cost
 and  expense,  in any discussions and proceedings relating thereto,  provided
 that  it  has so notified the Indemnitee of its intention to do  so  in  such
 notice.   If  Indemnitor does participate in any discussions and proceedings,
 Indemnitor shall pay its own costs and expenses in connection therewith.
 
      Any  settlement or compromise made by the Indemnitee in accordance  with
 this  Section 12.3 without the participation of the Indemnitor or  any  final
 judgment or decree entered in any claim, suit or action defended only by  the
 Indemnitee alone shall be deemed to have been consented to by, and  shall  be
 obligatory  and  binding upon, the Indemnitor as fully as if  the  Indemnitor
 alone had assumed the defense thereof and a final judgment or decree had been
 entered  in such suit or action, or with regard to such claim by a  court  of
 competent  jurisdiction  for  the amount of such  settlement  or  compromise,
 satisfaction, judgment or decree, subject only to the right of the Indemnitor
 to  dispute  that  any such claim is a Covered Claim if,  but  only  if,  the
 Indemnitor has served the proper notice within the proper time asserting that
 the claim is not a Covered Claim.
 
 Section 12.4.   Securities Law Indemnification; Contribution.
 
      (a)     Indemnification  by Earth Sciences.  Earth  Sciences  agrees  to
 indemnify, to the full extent permitted by law, the Shareholders, and any  of
 their  officers and directors and each person who controls, is controlled  by
 or  under common control with (within the meaning of the Securities Act) such
 Persons  against  all  losses,  claims,  damages,  liabilities  and  expenses
 (including  attorneys' fees and other expenses incurred  in  connection  with
 investigating or defending any such claims) caused by any untrue  or  alleged
 untrue  statement of material fact contained in the Disclosure  Material,  or
 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,
 except  insofar  as  the  same are caused by any  such  untrue  statement  or
 omission  or  alleged  untrue statement or omission  based  upon  information
 furnished  in  writing to Earth Sciences by or on behalf of the  Shareholders
 expressly for use therein.
 
      (b)     Conduct of Indemnification Proceedings.  Any person entitled  to
 indemnification  hereunder  agrees  to give  prompt  written  notice  to  the
 indemnifying party after the receipt by such person of any written notice  of
 the  commencement of any action, suit, proceeding or investigation or  threat
 thereof  made in writing for which such person will claim indemnification  or
 contribution  pursuant  to  this  Agreement and,  unless  in  the  reasonable
 judgment  of such indemnified party a conflict of interest may exist  between
 such indemnified party and the indemnifying party with respect to such claim,
 permit  the  indemnifying  party to assume the defense  of  such  claim  with
 counsel   reasonably  satisfactory  to  such  indemnified  party.    If   the
 indemnifying party is not entitled to, or elects not to, assume  the  defense
 of  a  claim, it will not be obligated to pay the fees and expenses  of  more
 than  one  counsel  with  respect to such claim,  unless  in  the  reasonable
 judgment  of  any indemnified party a conflict of interest may exist  between
 such indemnified party and any other of such indemnified parties with respect
 to  such  claim, in which event the indemnifying party shall be obligated  to
 pay  the  fees  and  expenses of such additional counsel  or  counsels.   The
 indemnifying  party will not be subject to any liability for  any  settlement
 made without its consent.
 
      (c)     Contribution.   If  the indemnification  provided  for  in  this
 Section  from  the indemnifying party is unavailable to an indemnified  party
 hereunder in respect of any losses, claims, damages, liabilities or  expenses
 referred  to  therein, then the indemnifying party, in lieu  of  indemnifying
 such  indemnified party, shall contribute to the amount paid  or  payable  by
 such  indemnified  party  as  a  result  of  such  losses,  claims,  damages,
 liabilities  or expenses in such proportion as is appropriate to reflect  the
 relative  fault  of  the  indemnifying  party  and  indemnified  parties   in
 connection  with the actions which resulted in such losses, claims,  damages,
 liabilities   or   expenses,  as  well  as  any  other   relevant   equitable
 considerations.    The  relative  fault  of  such  indemnifying   party   and
 indemnified parties shall be determined by reference to, among other  things,
 whether  any  action  in  question, including any untrue  or  alleged  untrue
 statement  of  a  material fact, has been made by, or relates to  information
 supplied by, such indemnifying party or indemnified parties, and the parties'
 relative intent, knowledge, access to information and opportunity to  correct
 or prevent such action.  The amount paid or payable by a party as a result of
 the losses, claims, damages, liabilities and expenses referred to above shall
 be  deemed to include any legal or other fees or expenses reasonably incurred
 by such party in connection with any investigation or proceeding.
 
      The  parties  hereto agree that it would not be just  and  equitable  if
 contribution pursuant to this Section were determined by pro rata  allocation
 or  by  any  other method of allocation which does not take into account  the
 equitable  considerations referred to in the immediately preceding paragraph.
 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.
 
      If  indemnification  is available under this Section,  the  indemnifying
 party  shall indemnify each indemnified party to the full extent provided  in
 subsection  (a)  hereof  without  regard  to  the  relative  fault  of   said
 indemnifying  party or indemnified party or any other equitable consideration
 provided for in this subsection (c).
 
 ARTICLE 13.GENERAL
 
 Section 13.1.   Amendment and Modification.
 
      This  Agreement may be amended, modified or supplemented only by written
 agreement of all of the Shareholders and Earth Sciences.
 
 Section 13.2.   Waiver of Compliance; Consents.
 
      Any failure of Earth Sciences, on the one hand, or the Shareholders,  on
 the  other  hand,  to  comply  with any obligation,  covenant,  agreement  or
 condition  herein may be waived in writing by Earth Sciences or  all  of  the
 Shareholders, respectively, but such waiver or failure to insist upon  strict
 compliance with such obligation, covenant, agreement or condition  shall  not
 operate as a waiver of, or estoppel with respect to, any subsequent or  other
 failure.  Whenever this Agreement requires or permits consent by or on behalf
 of  Earth Sciences or all of the Shareholders, such consent shall be given in
 writing  in  a  manner  consistent with the  requirements  for  a  waiver  of
 compliance as set forth in this Section.
 
 Section 13.3.   Notices.
 
      All  notices and other communications hereunder shall be in writing  and
 shall  be  deemed given on the date of delivery, if delivered  personally  or
 faxed  during  normal business hours of the recipient, or  three  days  after
 deposit  in  the  U.S.  Mail, postage prepaid, if  mailed  by  registered  or
 certified mail (return receipt requested) as follows:
 
     (a)    If to the Shareholders, to:
 
            ADA Technologies, Inc.
            304 Inverness Way South
            Suite 365
            Englewood, CO  80112
            Attention:  Judith A. Armstrong
            Telephone:  (303) 792-5615
            Fax:  (303) 792-5633
 
            Kenneth E. Baldrey
            2746 W. Yale Ave.
            Denver, CO  80219
            Telephone:  (303) 761-6764
 
            C. Jean Bustard
            9193 Buffalo Dr.
            Littleton, CO  80127
            Telephone: (303) 933-3401
 
            Cameron E. Martin
            966 S. York St.
            Denver, CO  80209
            Telephone: (303) 777-0442
 
            John F. Wurster
            3815 Spring Valley Trail
            Evergreen, CO  80439
            Telephone: (303) 670-1343
 
 in each case with a copy to:
 
             Baker & Hostetler
             303 East 17th Avenue, Suite 1100
             Denver, Colorado  80203
            Attention: Alfred C. Chidester
            Telephone: (303) 861-0600
            Fax: (303) 861-2307
 
 (b) If to Earth Sciences, to:
 
            Earth Sciences, Inc.
            910 12th Street
            Golden, CO  80401
            Attention:  Mark McKinnies
            Telephone: (303) 279-7641
            Fax: (303) 279-1180
 
            with a copy to:
 
            Scott M. Reed
            Parcel, Mauro, Hultin & Spaanstra, P.C.
            1801 California Street, Suite 3600
            Denver, CO  80202-2636
            Telephone: (303) 293-6522
            Fax: (303) 295-3040
 
 (c) If to ADA-ES, to:
 
            ADA-ES, Inc.
             304 Inverness Way South, Suite 365
             Englewood, Colorado  80112
            Attention:  Michael D. Durham
            Telephone:  (303) 792-5615
            Fax:  (303) 792-5633
 
     (d)    If to ADA-LLC, to:
 
            ADA Environmental Solutions LLC
             304 Inverness Way South, Suite 365
             Englewood, Colorado  80112
            Attention:  Michael D. Durham
            Telephone:  (303) 792-5615
            Fax:  (303) 792-5633
 
 Section 13.4.   Assignability and Parties in Interest.
 
      This  Agreement may not be assigned.  This Agreement shall inure to  the
 benefit  of  and be binding upon Earth Sciences and each of the  Shareholders
 and  their  respective  successors.  Nothing in this  Agreement,  express  or
 implied,  is intended to confer upon any other person any rights or  remedies
 of any nature whatsoever under or by reason of this Agreement.
 
 Section 13.5.   Governing Law.
 
      THIS  AGREEMENT  SHALL  BE GOVERNED BY, AND CONSTRUED  AND  ENFORCED  IN
 ACCORDANCE  WITH, THE LAWS OF THE STATE OF COLORADO APPLICABLE  TO  CONTRACTS
 MADE AND TO BE PERFORMED ENTIRELY WITHIN THAT STATE.
 
 <PAGE>
 Section 13.6.   Counterparts.
 
       This   Agreement  may  be  executed  simultaneously  in  one  or   more
 counterparts,  each of which shall be deemed an original, but  all  of  which
 shall constitute but one and the same instrument.
 
 Section 13.7.   Signatures on Behalf of Corporation.
 
      Any  individual  signing this Agreement or any  other  document  related
 hereto  on  behalf of a corporation, in his or her capacity as an officer  of
 such  corporation, is acting solely in his or her capacity as an  officer  of
 the  corporation and shall not assume, and shall not be deemed to assume, any
 personal liability when acting in that capacity.
 
 Section 13.8.   Complete Agreement.
 
      This  Agreement,  the  Exhibits hereto, the  Schedules  hereto  and  the
 documents  delivered pursuant to this Agreement contain or will  contain  the
 entire  agreement between the parties hereto with respect to the transactions
 contemplated herein and shall supersede all previous oral and written and all
 contemporaneous oral negotiations, commitments and understandings.
 
 Section 13.9.   Interpretation.
 
      The headings contained in this Agreement are for reference purposes only
 and  shall  not  affect  in  any way the meaning or  interpretation  of  this
 Agreement.
 
 Section 13.10.  Severability.
 
       Any  provision  of  this  Agreement  which  is  invalid,  illegal,   or
 unenforceable  in  any  jurisdiction  shall,  as  to  that  jurisdiction,  be
 ineffective   to   the   extent   of   such   invalidity,   illegality,    or
 unenforceability,  without  affecting in any  way  the  remaining  provisions
 hereof in such jurisdiction or rendering that or any other provision of  this
 Agreement invalid, illegal, or unenforceable in any other jurisdiction.
 
 Section 13.11.  Knowledge.
 
      All  representations and warranties contained herein which are  made  to
 the  "knowledge" of ADA, the Shareholders or Earth Sciences shall mean to the
 actual  present  knowledge of the Shareholders or ADA's  or  Earth  Sciences'
 executive officers, respectively.
 
 Section 13.12.  Submission to Jurisdiction.
 
      Each of the parties hereto irrevocably consents that any legal action or
 proceeding  against it or any of its property with respect to this  Agreement
 or  any other agreement executed in connection herewith may be brought in any
 court  of  the State of Colorado, any Federal court of the United  States  of
 America  located  in  Denver, Colorado, or both, and  by  the  execution  and
 delivery  of this Agreement each party hereto hereby accepts with  regard  to
 any  such  action  or proceeding for itself and in respect of  its  property,
 generally and unconditionally, the jurisdiction of the aforesaid courts.
 
 Section 13.13.  Arbitration.
 
      Any controversy, dispute or claim arising out of, in connection with  or
 in  relation to, the interpretation, performance or breach of this Agreement,
 including,  without  limitation, the validity, scope, and  enforceability  of
 this Section shall be solely and finally settled by arbitration conducted  in
 Denver,  Colorado,  by  and in accordance with the then  existing  rules  for
 commercial arbitration of American Arbitration Association, or any  successor
 organization.  Judgment upon any award rendered by the arbitrator(s)  may  be
 entered  by the State or Federal Court having jurisdiction thereof.   Any  of
 the  parties may demand arbitration by written notice to the other and to the
 American Arbitration Association ("Demand for Arbitration").  The arbitrators
 shall  conduct  the arbitration in a manner in accordance  with  the  Federal
 Arbitration  Act U.S.C.  1 et seq. and the rules of the American  Arbitration
 Association.   The  arbitrators  may only  award  compensatory  and  punitive
 damages.   The  parties  intend that this agreement to  arbitrate  be  valid,
 enforceable and irrevocable.
 
      IN  WITNESS WHEREOF, the undersigned duly execute this Agreement  as  of
 the date first written above.
 
 
                                EARTH SCIENCES, INC.
 
 Date:  April 30, 1997          By:/s/  Mark H. McKinnies
                                Name:  Mark H. McKinnies
                                Title:  President
 
 
                                ADA-ES, INC.
 
 Date:  April 30, 1997          By: /s/ Michael D. Durham
                                Name:  Michael D. Durham
                                Title:   President, Chief  Executive  Officer
                                        and Director
 
 
                                ADA ENVIRONMENTAL SOLUTIONS LLC
 
 Date:  April 30, 1997          By:  /s/ Michael D. Durham
                                Name:  Michael D. Durham
                                Title:  Manager
 
 Date:  April 30, 1997          By:  /s/  Judith A. Armstrong
                                Name:  Judith A. Armstrong
                                Title:  Manager
 
 Date:  April 30, 1997          By: /s/  Mark H. McKinnies
                                Name:  Mark McKinnies
                                Title:  Manager
 
 
                                SHAREHOLDERS:
 
                                ADA TECHNOLOGIES, INC.,
                                Owning 8,171 shares of ADA-ES Common Stock
 
 Date:  April 30, 1997          By: : /s/  Judith A. Armstrong
                                Name:  Judith A. Armstrong
                                Title: President and Chief Executive Officer
 
 
 Date:  April 30, 1997          By: : /s/ Michael D. Durham
                                Name:  Michael D. Durham
                                Title: Executive Vice President
 
 Date:  April 30, 1997          By:  /s/ John F. Wurster
                                Name:  John F. Wurster
                                Title: Vice President, Sales and Marketing
 
 Date:  April 30, 1997          By: /s/ C. Jean Bustard
                                Name:  C. Jean Bustard
                                Title: Vice President, Projects Management
 
 
                                C. JEAN BUSTARD
 
 Date:  April 30, 1997             /s/ C. Jean Bustard
                                Owning 549 shares of ADA-ES Common Stock
 
 
                                JOHN F. WURSTER
 
 Date:  April 30, 1997            /s/ John F. Wurster
                                Owning 1,006 shares of ADA-ES Common Stock
 
 
                                KENNETH E. BALDREY
 
 Date:  April 30, 1997             /s/ Kenneth E. Baldrey
                                Owning 183 shares of ADA-ES Common Stock
 
 
                                CAMERON E. MARTIN
 
 Date:  April 30, 1997            /s/  Cameron E. Martin
                                Owning 91 shares of ADA-ES Common Stock
 
 
 
 
 <PAGE>
 
 
 EXHIBIT 2.2   AMENDED AND RESTATED OPERATING AGREEMENT OF ADA ENVIRONMENTAL
 SOLUTIONS LLC, A COLORADO LIMITED LIABILITY COMPANY, APRIL 30, 1997
 
 
                              AMENDED AND RESTATED
                                        
                               OPERATING AGREEMENT
                                        
                                       OF
                                        
                         ADA ENVIRONMENTAL SOLUTIONS LLC
                                        
                      A Colorado Limited Liability Company
                                        
                                 April 30, 1997
 
 <PAGE>
                                        
                                TABLE OF CONTENTS
                                                            Page
 ARTICLE I  FORMATION                                       1
 
 1.1Member(s)                                               1
 1.2Name
 1.3Principal Place of Business                             2
 1.4Term of the Company                                     2
 
 ARTICLE II BUSINESS OF THE COMPANY                         2
 
 2.1Permitted Business                                      2
 2.2Authority                                               2
 
 ARTICLE IIIGENERAL ACCOUNTING MATTERS; BOOKS AND RECORDS   2
 
 3.1Books of Account                                        2
 3.2Location of Books and Records                           2
 3.3Inspection of Records                                   3
 3.4Tax Returns                                             3
 3.5Reports                                                 3
 (a)Preparation of Reports                                  3
 (b)Reports to Members                                      4
 
 ARTICLE IV CAPITAL ACCOUNTS                                4
 
 4.1Capital Contributions and Percentage Interest           4
 
 (a)Permitted Contributions                                 4
 (b)Percentage Interest                                     4
 
 4.2Capital Accounts                                        5
 
 (a)Maintenance of Capital Accounts                         5
 (b)Transfer of Capital Account                             5
 (c)No Interest Accrual                                     5
 (d)Computation of Capital Account Adjustments              5
 
 4.3Basis-Adjustment Election                               5
 4.4Withdrawal or Reduction of Capital Contributions        5
 4.5Additional Capital                                      6
 
 ARTICLE V  INCOME AND DISTRIBUTION                         6
 
 5.1Profits and Losses                                      6
 5.2Distributions                                           7
 
 ARTICLE VI RIGHTS AND DUTIES OF MANAGERS                   7
 
 6.1Management                                              7
 6.2Number, Tenure and Qualifications                       7
 6.3Certain Powers of Manager                               7
 6.4Liability for Certain Acts                              9
 6.5Managers and Members Have No Exclusive Duty to Company  9
 6.6Bank Accounts                                           9
 6.7Indemnity of the Managers, Employees and Other Agents   9
 6.8Resignation                                             10
 6.9Removal                                                 10
 6.10       Vacancies                                       10
 6.11       Compensation, Reimbursement, Organization Expenses   10
 6.12       Right to Rely on the Manager(s)                 10
 6.13       Tax Matters Partner                             11
    (a)     Designation                                     11
    (b)     Limitations on Extending Statute of Limitations 11
    (c)     Filing Petitions in Tax Court                   11
    (d)     Accountants and Lawyers                         11
 
 ARTICLE VIIMEMBERS' LIABILITY, RIGHTS AND DUTIES           11
 
 7.1Limitation of Liability                                 11
 7.2Company Debt Liability                                  11
 7.3Priority and Return of Capital                          12
 7.4Approval of Sale of All Assets                          12
 
 ARTICLE VIII  GENERAL RESTRICTIONS ON TRANSFER OF A MEMBERSHIP
               INTEREST                                     12
 
 8.1Restrictions                                            12
 8.2Transfers                                               12
 8.3Exceptions                                              12
 
 ARTICLE IX VOLUNTARY OR INVOLUNTARY TRANSFER               13
 
 9.1Notice of Intention to Transfer                         13
 9.2Third Party Offers                                      13
 9.3Option to Purchase                                      13
 9.4Election to Dissolve Company                            13
 9.5Purchase Price                                          13
 9.6Release from Restriction                                14
 9.7Changed Offer                                           14
 9.8Form of Offer                                           14
 9.9Substituted Member                                      14
 9.10       Option on the Part of Company                   15
 9.11       Termination of Employment                       15
 
 ARTICLE X  PURCHASE PRICE AND TERMS                        15
 
 10.1       Purchase Price                                  15
 10.2       Appraisal                                       15
 10.3       Terms of Purchase Price                         16
 10.4       Payment in Cash                                 16
 10.5       Closing                                         16
    (a)     Time and Place of Closing                       16
    (b)     Conditions to Closing                           16
 
 ARTICLE XI TERMINATION AND DISSOLUTION                     16
 
 11.1       Grounds for Dissolution                         16
 11.2       Continuation of Business Notwithstanding
            Dissolution                                     17
 11.3       Dissolution Procedure                           17
 11.4       Distributions in Liquidation                    17
    (a)     Priority of Distributions                       17
    (c)     Definitions                                     18
 
 11.5       Waiver of Partition - Dissolution and Withdrawal     18
 
 ARTICLE XIIARBITRATION                                     19
 
 ARTICLE XIII  INVESTMENT REPRESENTATIONS                   19
 
 13.1       Interests Not Registered                        19
 13.2       Investment Representation                       19
 13.3       Further Representations                         20
 
 ARTICLE XIVGENERAL MATTERS                                 20
 
 14.1       Governing Law                                   20
 14.2       No Waiver                                       20
 14.3       Amendment                                       20
 14.4       Binding Effect                                  20
 14.5       Construction; Definitions                       20
 14.6       Text To Control                                 21
 14.7       Severability                                    21
 14.8       Notices                                         21
 14.9       Entire Agreement                                21
 14.10      Counterparts                                    21
 
 SCHEDULE ASA-1
 
 SCHEDULE BSB-1
 
 Part A.    Special Allocation Provisions                   SB-1
 Part B.    Capital Account Adjustments and 704(c) Tax
            Allocations                                     SB-2
 Part C.    Definitions                                     SB-4
 
 <PAGE>
                                        
                              AMENDED AND RESTATED
                               OPERATING AGREEMENT
                                       OF
                         ADA ENVIRONMENTAL SOLUTIONS LLC
                     (a Colorado Limited Liability Company)
                                        
     ADA  Technologies, Inc., C. Jean Bustard, Kenneth E. Baldrey, Cameron  E.
 Martin  and  John F. Wurster (the "Original Members") executed  that  certain
 Operating Agreement of ADA Environmental Solutions LLC (the "Company")  dated
 September  20, 1996 (the "Agreement"), relating to the Company.  Pursuant  to
 the Agreement, the Original Members were the only members of the Company.  On
 February   17,  1997,  the  Original  Members  contributed  their  membership
 interests  in the Company to ADA-ES, Inc., a Colorado corporation  ("ADA-ES")
 in  exchange  for all of the issued and outstanding common stock  of  ADA-ES.
 Simultaneously  therewith,  the Original Members  and  ADA-ES  executed  that
 certain  Amendment No. 1 to the Agreement, making ADA-ES the sole  member  of
 the  Company.   On  February  18,  1997, Earth  Sciences,  Inc.,  a  Colorado
 corporation ("Earth Sciences") became an additional Member of the Company  by
 contributing  $400,000 cash to the Company in exchange for a 4.8%  membership
 interest in the Company.  Simultaneously therewith, ADA-ES and Earth Sciences
 executed  that  certain  Amendment No. 2 to  the  Operating  Agreement  dated
 February 18, 1997, making ADA-ES and Earth Sciences the only Members  of  the
 Company.   ADA-ES  and  Earth Sciences have agreed that Earth  Sciences  will
 contribute  an  additional  $500,000  in  cash  and  a  non-interest  bearing
 promissory  note  in the principal amount of $1,600,000  to  the  Company  in
 exchange  for  an  additional  46.2% membership  interest  in  the  LLC  (the
 "Additional   Contribution").    Upon   consummation   of   the    Additional
 Contribution,  Earth  Sciences  will own a 51%  membership  interest  in  the
 Company and ADA-ES will own a 49% membership interest in the Company.
 
     The  following  are  the  amended and restated  terms  of  the  Company's
 Operating Agreement:
 
 
 ARTICLE I FORMATION
 
     1.1      Member(s).   The  current Member  or  Members  of  the  Company,
 pursuant  to  the provisions of the Colorado Limited Liability  Company  Act,
 including  any  amendments thereto (the "Act"), are listed on Schedule  A  of
 this  Amended and Restated Operating Agreement (this "Agreement").  (The term
 "Member" shall include, in addition to the current member or members, each of
 the  parties who may hereafter become a Member of the Company).  The  Company
 shall  have  no  fewer  than  one  Member  at  any  time.   The  Articles  of
 Organization  filed  with respect to the Company have been  adopted  and  are
 incorporated by reference in this Agreement.
 
     1.2      Name.   The  name  of  the Company shall  be  ADA  Environmental
 Solutions LLC.
 
     1.3      Principal Place of Business.  The principal office and principal
 place  of  business  of the Company in Colorado shall be  304  Inverness  Way
 South, Suite 365, Englewood, Colorado 80112.
 
     1.4     Term of the Company.  The Company shall commence on the date that
 the  Articles of Organization are filed with the Colorado Secretary of State.
 The  Company shall continue for a period of 21 years unless earlier dissolved
 as provided in this Agreement.
 
 
 ARTICLE II BUSINESS OF THE COMPANY
 
     2.1  Permitted Business.  The business of the Company shall be to conduct
 all lawful business which may be perform by a limited liability company under
 Colorado law.
 
     2.2   Authority.  The Company shall have the powers set forth in the Act,
 including  the  authority  to  borrow and loan money  and  the  authority  to
 purchase, lease or in any manner hold, own, improve, sell, exchange, or lease
 any  property  in connection with its business.  The Company shall  have  the
 power and authority to enter into and engage in any lawful business agreed to
 by the Members and not prohibited by the Act.
 
 
 ARTICLE III GENERAL ACCOUNTING MATTERS; BOOKS AND RECORDS
 
     3.1   Books  of  Account.  True and proper books,  records,  reports  and
 accounts  of the Company shall be maintained by the Company at all  times  in
 accordance   with  generally  accepted  accounting  principles   consistently
 applied,  or  such alternate, consistently-applied accounting  principles  as
 shall  accurately reflect the income, gain, loss and financial  condition  of
 the  Company.   All  transactions of the Company shall be entered  fully  and
 accurately on the books and records of the Company.
 
     3.2  Location of Books and Records.  The books and records of the Company
 shall  be kept at the Company's principal place of business.  Such books  and
 records  shall  include (a) a current list of the full name  and  last  known
 mailing  address  of each past and present Member and Manager  set  forth  in
 alphabetical  order;  (b)  a copy of the Articles  of  Organization  and  all
 amendments  thereto, together with executed copies of any powers of  attorney
 pursuant  to  which  any  amendment has been  executed;  (c)  copies  of  the
 Company's  federal, state and local income tax returns and reports,  if  any,
 for  the  three  most  recent years; (d) copies of  this  Agreement  and  any
 amendments  thereto; (e) the accounting books and records and copies  of  the
 financial  statements  of the Company for the three most  recent  years;  (f)
 minutes  of every annual and special meeting of the Members and Managers  and
 of  any meeting ordered pursuant to the Act; (g) any written consents of  the
 Members  obtained  pursuant to the Act; (h) all other documents  and  records
 pertaining  to the Company; and (i) any and all other documents  and  records
 required to be maintained by the Company pursuant to the Act.  In addition to
 the documents and records described above, the Company shall also prepare and
 update  and the Members shall certify as accurate a statement describing  (1)
 the  amount  of cash and a description and statement of the agreed  value  of
 property  or  services contributed to the Company by each Member,  and  which
 each Member has agreed to contribute in the future; (2) the times at which or
 events  on the happening of which any additional contributions agreed  to  be
 made by each Member are to be made; (3) if agreed upon, the time at which  or
 events  on  the  happening  of  which a Member may  terminate  such  Member's
 membership  in  the Company and the amount of, or the method of  determining,
 the  distribution  to  which  such Member may  be  entitled  respecting  such
 Member's  membership interest and the terms and conditions of the termination
 and  distribution;  and  (4) any right of a Member to  receive  distributions
 which include any return of all or part of such Member's contribution.
 
     3.3  Inspection of Records.  All books, records, reports and accounts  of
 the  Company shall be open to inspection by any Member or such Member's  duly
 authorized  representative on reasonable notice and at  any  reasonable  time
 during  business  hours,  and each Member or representative  shall  have  the
 further  right  to  make  copies  thereof, so  long  as  such  inspection  or
 duplication  does  not materially interfere with the duties  of  any  Company
 employee  or  agent.  The cost of copying shall be borne by the Member.   The
 Member also has the right to obtain from the Company upon written request:
 
          (a)   true and full information regarding the state of the  business
 and  financial  condition of the Company and any other information  regarding
 the affairs of the Company;
 
          (b)   promptly after they become available, copies of the  Company's
 federal, state and local income tax returns for each year; and
 
          (c)   a  list showing the names, addresses and Percentage  Interests
 (defined in Section 4.1) of all Members.
 
     3.4   Tax Returns.  The Company shall prepare, sign and file all federal,
 state, and local tax returns required to be filed by the Company.
 
    3.5  Reports.
 
          (a)   Preparation of Reports.  The Company's accounting books  shall
 be  closed  annually,  and  financial statements shall  be  prepared  by  the
 Company's  accountants.   The financial statements shall  include  a  balance
 sheet,  a  statement  of  profits and losses, a statement  of  cash  flow,  a
 statement  of  each  Member's  capital  account  and  such  other  supporting
 statements  as  the  Members may deem appropriate.  The financial  statements
 shall  be prepared in accordance with the accounting principles set forth  in
 Section  3.1 of this Agreement.  Neither the Company nor any Member shall  be
 obligated  to  cause any financial statements of the Company to  be  audited.
 However,  any  Member  may  request  that  the  financial  statements  for  a
 particular year be audited and the costs of such audit shall be borne by  the
 requesting  Member,  unless the Members agree that such  costs  shall  be  an
 expense of the Company.
 
          (b)  Reports to Members.  No later than March 31 of every year,  the
 following shall be mailed to each person who was a Member or a transferee  of
 a  Membership Interest in the Company at any time during the prior year:  (1)
 a  true  and  correct photocopy of the financial statements  referred  to  in
 Section  3.5(a);  (2) all tax information relating to the  Company  which  is
 necessary  for  the  preparation of such person's federal,  state  and  local
 income  tax returns; and (3) any other information regarding the Company  and
 its operations during the prior year which is material or significant to such
 person.
 
 
 ARTICLE IV CAPITAL ACCOUNTS
 
    4.1  Capital Contributions and Percentage Interest.
 
          (a)   Permitted Contributions.  The contributions to  capital  of  a
 Member shall consist of cash or other property or a promissory note or  other
 obligation to contribute cash or property.  The original contribution of each
 Member  to  the  capital  of the Company is listed  on  Schedule  A  of  this
 Agreement.  Schedule A shall list the adjusted basis (as that term is defined
 in  Section  1011  of  the Internal Revenue Code of  1986,  as  amended  (the
 "Code")),  of  any  property  contributed to  the  Company,  the  Member  who
 contributed  the  property, and the fair market value of the  property.   The
 fair  market value of contributed property shall be agreed to by all Members.
 If  the  Members  cannot agree upon the fair market value of the  contributed
 property,  the fair market value shall be determined by the written appraisal
 of  a  qualified appraiser agreed upon by the parties.  If the parties cannot
 agree  upon such an appraiser within 30 days, the appraiser shall be selected
 and the fair market value of the contributed property shall be determined  in
 the same manner as set forth in Section 10.2.
 
           (b)    Percentage  Interest.   The  Members'  original   Percentage
 Interests shall be reflected on Schedule A and shall be adjusted from time to
 time  to reflect additional contributions or withdrawals of capital from  the
 Company  and  any  other  adjustments made to the  capital  accounts  of  the
 Members;  provided, however, that for voting purposes, the  term  "Percentage
 Interest" shall mean the percentage of each Member's capital contribution  to
 the  total  capital contributions of all Members entitled to  vote.   To  the
 extent that a Member's Percentage Interest exceeds the percentage of the fair
 market value of that Member's capital contributions to the fair market  value
 of  the  total capital contribution of all Members, such Member shall not  be
 treated  as  having an ownership interest in the Company's assets other  than
 with  respect  to  such Member's entitlement to share in  the  Company's  net
 profits.
 
    4.2  Capital Accounts.
 
          (a)   Maintenance of Capital Accounts.  A capital account  shall  be
 maintained  for  each  Member in accordance with this  Section  4.2  and  the
 principles  set  forth in Schedule B. The amount of cash or the  fair  market
 value  of  other property contributed to the Company by each Member,  net  of
 liabilities assumed by the Company or to which any such contributed  property
 is subject, shall be credited to such Member's capital account, and from time
 to  time,  but  not  less often than annually, the share of  each  Member  in
 profits,  losses and fair market value of distributions shall be credited  or
 charged  to such Member's capital account.  The determination and maintenance
 of  the Members' capital accounts, and any adjustments thereto, shall be made
 consistent  with  tax accounting and other principles set  forth  in  Section
 704(b) of the Code and Treasury Regulations promulgated thereunder.
 
           (b)   Transfer  of  Capital  Account.   Immediately  following  the
 transfer of any portion of a Membership Interest in the Company, the  capital
 account  of  the  transferee shall be equal to the  capital  account  of  the
 transferor  attributable to the transferred interest.  Such  capital  account
 shall  not be adjusted to reflect any basis adjustment under Section  743  of
 the  Code  unless the Members make an election under Section 754 of the  Code
 pursuant to Section 4.3 below.
 
          (c)   No Interest Accrual.  No interest shall be paid or accrued  by
 the Company on balances in Members' capital accounts.
 
          (d)   Computation of Capital Account Adjustments.  For  purposes  of
 computing  the amount of any item of income, gain, deduction or  loss  to  be
 reflected  in  the Members' capital accounts, the determination,  recognition
 and  classification of any such item shall be the same as its  determination,
 recognition  and classification for federal income tax purposes, taking  into
 account  any adjustments required pursuant to Section 704(b) of the Code  and
 the  Treasury  Regulations promulgated thereunder as more fully described  in
 Schedule B.
 
     4.3   Basis-Adjustment  Election.  The Members shall  elect  pursuant  to
 Section  754 of the Code to adjust the basis of the Company's assets for  all
 transfers  of  Company interests or distributions of property to  Members  if
 such election would benefit any Member or the Company.
 
     4.4   Withdrawal or Reduction of Capital Contributions.  A  Member  shall
 not  receive out of the Company's property any part of such Member's  capital
 contributions unless:
 
          (a)   all liabilities of the Company, except liabilities to  Members
 on  account of their capital contributions, have been paid, or there  remains
 sufficient Company property to pay them; and
 
          (b)   either the consent of all Members is obtained, or  the  Member
 may rightfully demand the return of the capital contributions pursuant to the
 Act.
 
     4.5   Additional  Capital.  If the Managers determine  that  the  Company
 requires  additional  capital  for  any purpose  reasonably  related  to  its
 business, the Company may:
 
          (a)   borrow  all  or part of such additional capital  by  obtaining
 loans either from Members or from third parties;
 
          (b)   call  for  voluntary additional capital contributions  to  the
 Company  from each Member in proportion to that Member's Percentage Interest;
 the additional capital contributions can consist of cash or a Promissory Note
 providing  for  the same terms as those set forth in Section  10.3(b)(i)  and
 (ii); in the event any Member declines to make a voluntary additional capital
 contribution in cash or by Promissory Note (a "Noncontributing Member"),  the
 other  Members  shall  have  the  right,  in  proportion  to  their  relative
 Percentage Interests in the Company (excluding the Percentage Interests  held
 by   the   Noncontributing   Members),  to  make  such   additional   capital
 contributions  in  cash or by Promissory Note, and after any  such  voluntary
 additional  capital contributions have been made by one or more Members,  the
 Percentage  Interests  of  all Members shall be  adjusted  according  to  the
 provisions of Section 4.1(b);
 
          (c)   combine  any  of  the  above-described  methods  of  obtaining
 financing as the Managers may deem appropriate.
 
 
 ARTICLE V INCOME AND DISTRIBUTION
 
    5.1  Profits and Losses.
 
          (a)   The  net  profit  and  losses, if any,  of  the  Company  from
 operations,  exclusive  of any profit or loss from the  capital  transactions
 described  in Section 5.1(b), shall be credited or charged to the Members  in
 proportion to their respective Percentage Interests.
 
          (b)   The  amount  realized  (and any accompanying  profit)  by  the
 Company  from  the sale, exchange or other disposition of the capital  assets
 contributed by any Member reflected in Exhibit A in excess of the fair market
 value of such capital assets on the date of contribution shall be credited to
 the Members in accordance with their Percentage Interests.
 
           (c)   Notwithstanding  any  provision  of  this  Agreement  to  the
 contrary,  to  the extent required by law, income, gain, loss  and  deduction
 attributable  to  property contributed to the Company by a  Member  shall  be
 shared among the Members so as to take into account any variation between the
 basis  of the property and the fair market value of the property at the  time
 of contribution in accordance with requirements of Section 704(c) of the Code
 and  the Treasury Regulations promulgated thereunder, as more fully described
 in Schedule B.
 
     5.2  Distributions.  All distributions shall be made among the Members in
 proportion  to  their  respective Percentage Interests.  Notwithstanding  the
 foregoing, no Member shall be entitled to receive distributions with  respect
 to  such Member's profits interest as established under Section 4.1(b)  above
 in  excess  of the amount by which the aggregate profits and amount  realized
 credited  to  such  Member  under Section 5.1(a) and  (b)  above  exceed  the
 aggregate distributions received by such Member from the commencement of  the
 Company's operations.
 
 
 ARTICLE VI RIGHTS AND DUTIES OF MANAGERS
 
 
     6.1   Management.   The  business and affairs of  the  Company  shall  be
 managed  by its Managers.  The Managers shall direct, manage and control  the
 business  of the Company to the best of their ability.  Except for situations
 in  which the approval of the Members is expressly required by this Operating
 Agreement or by non-waivable provisions of applicable law, the Managers shall
 have  full and complete authority, power and discretion to manage and control
 the  business,  affairs and properties of the Company, to make all  decisions
 regarding  those matters and to perform any and all other acts or  activities
 customary  or incident to the management of the Company's business.   At  any
 time when there is more than one Manager, any action permitted to be taken by
 the  Managers,  shall  require  the approval  or  consent  of  all  Managers;
 provided,  however,  that the Managers may appoint an Executive  Manager  who
 shall  have  such authority as shall be set forth in a resolution adopted  by
 all Managers.
 
     6.2   Number,  Tenure and Qualifications.  The Company shall  have  three
 Managers. The number of Managers of the Company shall be fixed from  time  to
 time  by the affirmative vote of Members holding at least two-thirds  of  the
 Percentage  Interests,  but  in no instance shall  there  be  less  than  one
 Manager.  Managers need not be residents of the State of Colorado or  Members
 of  the Company.  Upon the effective date of this Agreement, the Managers  of
 the  Company shall be ADA Technologies, Inc., Earth Sciences and  Michael  D.
 Durham.
 
    6.3  Certain Powers of Manager.
 
          (a)   Without  limiting the generality of Section 6.1, the  Managers
 shall have power and authority, on behalf of the Company:
 
          (i)   To  acquire  property  from any person  as  the  Managers  may
 determine.   The  fact that a Manager or a Member is directly  or  indirectly
 affiliated or connected with any such person shall not prohibit the  Managers
 from dealing with that person;
               (ii)  To borrow money for the Company from banks, other lending
 institutions, the Managers, Members, or affiliates of the Managers or Members
 on  such terms as the Managers deem appropriate, and in connection therewith,
 to  hypothecate, encumber and grant security interests in the assets  of  the
 Company  to  secure  repayment  of  the borrowed  sums.   No  debt  shall  be
 contracted or liability incurred by or on behalf of the Company except by the
 Managers, or to the extent permitted under the Act, by agents or employees of
 the  Company  expressly  authorized  to contract  such  debt  or  incur  such
 liability by the Managers;
 
          (iii)      To purchase liability and other insurance to protect  the
 Company's property and business;
 
          (iv) To hold and own any Company real and/or personal properties  in
 the name of the Company;
 
          (v)  To invest any Company funds temporarily (by way of example  but
 not  limitation)  in  time  deposits,  short-term  governmental  obligations,
 commercial paper or other investments;
 
          (vi) Upon the affirmative vote of the Members holding at least  two-
 thirds  of the Percentage Interests, to sell or otherwise dispose of  all  or
 substantially  all  of  the  assets  of the  Company  as  part  of  a  single
 transaction  or  plan  provided, however, that the affirmative  vote  of  the
 Members shall not be required with respect to any sale or disposition of  the
 Company's assets in the ordinary course of the Company's business;
 
          (vii)      To  execute on behalf of the Company all instruments  and
 documents,  including, without limitation, checks; drafts;  notes  and  other
 negotiable  instruments;  mortgages or deeds of trust;  security  agreements;
 financing  statements; documents providing for the acquisition,  mortgage  or
 disposition  of the Company's property; assignments; bills of  sale;  leases;
 partnership  agreements,  operating agreements  of  other  limited  liability
 companies;  and any other instruments or documents necessary, in the  opinion
 of the Managers, to the business of the Company;
 
          (viii)     To employ accountants, legal counsel, managing agents  or
 other experts to perform services for the Company and to compensate them from
 Company funds;
 
          (ix)  To  enter into any and all other agreements on behalf  of  the
 Company, with any other Person for any purpose, in such forms as the Managers
 may approve; and
 
          (x)   To  do  and  perform all other acts as  may  be  necessary  or
 appropriate to the conduct of the Company's business.
 
     Unless authorized to do so by this Operating Agreement or by a Manager or
 Managers of the Company, no attorney-in-fact, employee or other agent of  the
 Company shall have any power or authority to bind the Company in any way,  to
 pledge  its  credit or to render it liable pecuniarily for any  purpose.   No
 Member  shall  have  any power or authority to bind the  Company  unless  the
 Member  has been authorized by the Managers to act as an agent of the Company
 in accordance with the previous sentence.
 
     6.4   Liability for Certain Acts.  Each Manager shall perform his  duties
 as  Manager in good faith, in a manner he reasonably believes to  be  in  the
 best  interests  of the Company, and with such care as an ordinarily  prudent
 person  in a like position would use under similar circumstances.  A  Manager
 who  so  performs the duties as Manager shall not have any liability  to  the
 Company  or the other Members by reason of being or having been a Manager  of
 the Company.
 
     6.5  Managers and Members Have No Exclusive Duty to Company.  The Manager
 shall  not  be  required  to manage the Company as  his  sole  and  exclusive
 function  and  he  (and any Manager and/or Member) may  have  other  business
 interests and may engage in other activities in addition to those relating to
 the  Company.  Neither the Company nor any Member or economic interest  owner
 shall  have  any right, by virtue of this Operating Agreement,  to  share  or
 participate  in  such other investments or activities of the  Manager  and/or
 Member  or  economic  interest owner or to the  income  or  proceeds  derived
 therefrom.   Neither  the Manager nor any Member or economic  interest  owner
 shall incur any liability to the Company or to any of the Members or economic
 interest  owners  as a result of engaging in any other business  or  venture;
 provided  that  the Manager (and/or Member) shall devote  such  time  to  the
 Company  as  is  necessary  for the conduct of the  Company's  business,  and
 further  provided  that where conflicts arise between  the  Company  and  the
 Manager's  (and/or Member's) other business interests, each  Manager  (and/or
 Member)  shall  endeavor to treat the Company no less  favorably  than  other
 interests of that Manager (and/or Member).
 
     6.6   Bank  Accounts.   The Managers may from  time  to  time  open  bank
 accounts  in  the  name of the Company, and the Managers shall  be  the  sole
 signatory thereon, unless the Managers determine otherwise.
 
     6.7   Indemnity of the Managers, Employees and Other Agents.  The Company
 shall  indemnify the Managers and make advances for expenses to  the  maximum
 extent  permitted under the Act.  The Company shall indemnify  its  employees
 and other agents who are not Managers to the fullest extent permitted by law,
 provided  that  such indemnification in any given situation  is  approved  by
 Members owning at least two-thirds of the Percentage Interests.
 
     Notwithstanding  any  other  provision of this  Operating  Agreement,  no
 Manager  shall  be  liable to any Member or economic interest  owner  or  the
 Company  with  respect to any act performed or neglected to be  performed  in
 good  faith  and in a manner which such Manager believed to be  necessary  or
 appropriate  in  connection  with the ordinary  and  proper  conduct  of  the
 Company's  business or the preservation of its property, and consistent  with
 the  provisions of this Agreement.  The Company shall indemnify the  Managers
 for and hold them harmless from any liability, whether civil or criminal, and
 any  loss, damage, or expense, including reasonable attorneys' fees, incurred
 in  connection with the ordinary and proper conduct of the Company's business
 and  the preservation of its business and property, or by reason of the  fact
 that  such person is or was a Manager; provided the Manager to be indemnified
 acted  in  good faith and in a manner such Manager believed to be  consistent
 with the provisions of this Agreement; and provided further that with respect
 to  any  criminal action or proceeding, the Manager to be indemnified had  no
 reasonable cause to believe the conduct was unlawful.  The termination of any
 action,  suit  or proceeding by judgment, order, settlement,  conviction,  or
 upon a plea of nolo contendere or its equivalent shall not of itself create a
 presumption that indemnification is not available hereunder.  The  obligation
 of  the Company to indemnify any Manager hereunder shall be satisfied out  of
 Company  assets  only, and if the assets of the Company are  insufficient  to
 satisfy  its obligation to indemnify any Manager, such Manager shall  not  be
 entitled to contribution from any Member.
 
     6.8   Resignation.  Any Manager of the Company may resign at any time  by
 giving written notice to the Members of the Company.  The resignation of  any
 Manager  shall  take effect upon receipt of notice thereof or at  such  later
 time  as  shall be specified in such notice; and, unless otherwise  specified
 therein, the acceptance of such resignation shall not be necessary to make it
 effective.  The  resignation of a Manager who is also a  Member  or  economic
 interest  owner shall not affect the Manager's rights as a Member or economic
 interest  owner and shall not constitute a withdrawal of a Member or economic
 interest owner.
 
     6.9  Removal.  At a meeting called expressly for that purpose, all or any
 lesser  number of Managers may be removed at any time, with or without cause,
 by  the  affirmative  vote  of Members holding at  least  two-thirds  of  the
 Percentage  Interests.  The Manager shall be entitled to vote his  Percentage
 Interest,  if any, on such matter.  The removal of a Manager who  is  also  a
 Member  shall  not  affect the Managers rights as  a  Member  and  shall  not
 constitute a withdrawal of a Member.
 
     6.10  Vacancies.  Any vacancy occurring for any reason in the  number  of
 Managers  of the Company shall be filled by the affirmative vote  of  Members
 holding  at  least  two-thirds of the Percentage  Interests.   Any  Manager's
 position  to  be  filled by reason of an increase in the number  of  Managers
 shall  be  filled  by  the  affirmative vote of at least  two-thirds  of  the
 Percentage Interests.
 
     6.11  Compensation,  Reimbursement, Organization  Expenses.   No  Manager
 shall  be entitled to compensation from the Company for services rendered  to
 the  Company as such.  Upon the submission of appropriate documentation  each
 Manager  shall  be  reimbursed  by the Company for  reasonable  out-of-pocket
 expenses  incurred  by  such Manager on behalf  of  the  Company  or  at  the
 Company's request.
 
    6.12 Right to Rely on the Manager(s).
 
          (a)   Any person dealing with the Company may rely (without duty  of
 further inquiry) upon a certificate signed by any Manager as to:
 
         (i)  The identity of any Manager, Member or Economic Interest Owner;
 
          (ii)  The  existence  or nonexistence of any  fact  or  facts  which
 constitute  a  condition precedent to acts on behalf of the  Company  by  any
 Manager  or  which  are in any other manner germane to  the  affairs  of  the
 Company;
 
               (iii)     The persons who are authorized to execute and deliver
 any instrument or document of the Company; or
 
          (iv)  Any  act or failure to act by the Company or any other  matter
 whatsoever involving the Company or any Member or economic interest owner.
 
    6.13 Tax Matters Partner.
 
          (a)  Designation.  Earth Sciences, Inc. is hereby designated the Tax
 Matters  Partner  for any taxable year of the Company in  which  the  Company
 fails  to  qualify  for  the exception for small partnerships  under  Section
 6231(a)(1)(B) of the Code.
 
          (b)   Limitations on Extending Statute of Limitations.  Without  the
 unanimous consent of the other Members, the Tax Matters Partner shall have no
 right to extend the statute of limitations for assessing or computing any tax
 liability against the Company or the amount of any Company tax item.
 
          (c)   Filing  Petitions in Tax Court.  If the  Tax  Matters  Partner
 elects  to  file  a  petition for adjustment of  any  Company  tax  item  (in
 accordance  with  6226(a) of the Code), such petition shall,  unless  Members
 holding  at least a majority of the Percentage Interests determine otherwise,
 be filed in the United States Tax Court.
 
          (d)  Accountants and Lawyers.  Any reasonable costs incurred by  the
 Tax  Matters  Partner for retaining accountants or lawyers on behalf  of  the
 Company  in connection with any Internal Revenue Service audit of the Company
 shall be expenses of the Company.
 
 
 ARTICLE VII MEMBERS' LIABILITY, RIGHTS AND DUTIES
 
     7.1   Limitation of Liability.  Each Member's liability shall be  limited
 as set forth in the Act, other applicable law and this Agreement.
     7.2   Company  Debt Liability.  Except as otherwise provided  by  law,  a
 Member  will not personally be liable for any debts or losses of the  Company
 beyond such Member's respective capital contribution.
 
     7.3   Priority and Return of Capital.  No Member shall have priority over
 any  other Member, either as to the return of capital contributions or as  to
 net  profits,  net losses or distributions; provided that this Section  shall
 not  apply  to  loans (as distinguished from capital contributions)  which  a
 Member has made to the Company.
 
     7.4   Approval of Sale of All Assets.  The Members shall have the  right,
 by  the  affirmative  vote  of Members holding at  least  two-thirds  of  the
 Percentage  Interests, to approve the sale, exchange or other disposition  of
 all,  or  substantially  all, of the Company's  assets  (other  than  in  the
 ordinary  course of the Company's business) which is to occur as  part  of  a
 single transaction or plan.
 
 
 ARTICLE VIII GENERAL RESTRICTIONS ONTRANSFER OF A MEMBERSHIP INTEREST
 
     8.1   Restrictions.   While this Agreement is in  force,  no  Member  may
 directly or indirectly transfer all or any part of his ownership interest  in
 the  Company  (a  "Membership  Interest"), whether  now  owned  or  hereafter
 acquired,  without  first complying with the terms  and  conditions  of  this
 Agreement.   Any attempted transfer in contravention of this Agreement  shall
 be null and void.
 
     8.2   Transfers.  For purposes of this Agreement, a transfer  shall  mean
 any  direct or indirect act, whether voluntary, involuntary, or by  operation
 of  law,  which causes a disposition or encumbrance of all or any part  of  a
 Membership  Interest,  including  but not limited  to  a  sale,  foreclosure,
 assignment,  gift,  exchange, pledge, hypothecation, bequest  or  attachment.
 Further,  the  following  events shall be deemed  to  cause  a  transfer  for
 purposes of this Agreement:
 
          (a)   A  Member  is  adjudicated a bankrupt,  whether  voluntary  or
 involuntary;
 
          (b)   A  Member makes an assignment for the benefit of such Member's
 creditors;
 
          (c)   The termination of employment of a Member with the Company  by
 voluntary act of the Member ("Termination of Employment"); or
 
          (d)   The death of a Member after the fifth anniversary date of this
 Agreement ("Death").
 
     8.3   Exceptions.    Notwithstanding the foregoing, a Member may transfer
 all  or  part of his Membership Interest at any time to one or more revocable
 living  trusts  that have been established by the Member  whose  interest  is
 being   transferred  or  such  Member's  nominee.   The  trustees  and  their
 successors  in  trust  shall  be subject to all of  the  provisions  of  this
 Agreement.  If the interest is subsequently assigned by the trust  to  anyone
 other  than  the  Member  who  created the trust,  the  assignment  shall  be
 effective only upon the consent of all the other Members.
 
 
 ARTICLE IX VOLUNTARY OR INVOLUNTARY TRANSFER
 
     9.1  Notice of Intention to Transfer.  If a Member desires to transfer or
 is deemed to have transferred (within the meaning of Article VIII hereof) all
 or  any  part of his Membership Interest, such Member or such Member's  legal
 representative  (the  "Transferring Member") shall give written  notice  (the
 "Notice")  to  the other Members of such desire or of the event  causing  the
 transfer, except in the case of a Termination of Employment where the act  of
 such termination shall be deemed the required Notice and the Company shall so
 notify  the remaining Members.  The Notice shall specify the interest  to  be
 transferred  (the  "Offered Interest") and the nature of all  other  material
 terms  of  the transfer.  The Notice shall constitute an offer  to  sell  the
 Offered  Interest  to  the other Members, in proportion to  their  Percentage
 Interests,  on  the terms and conditions of Section 9.5 (the  "Offer").   The
 terms  of  this  Section  9.1 shall not apply to any  pledge,  conveyance  or
 encumbrance  of  a  Membership  Interest where  such  pledge,  conveyance  or
 encumbrance is made for the purpose of obtaining financing for the  Company's
 operations.
 
     9.2   Third  Party  Offers.   In the event the  Transferring  Member  has
 received  a  bona fide offer from a third party to purchase the  Transferring
 Member's  Membership Interest ("Third Party Offer"), the  Notice  also  shall
 identify the third party and the purchase price, terms and conditions of  the
 Third  Party Offer.  A bona fide offer shall mean a legally enforceable offer
 from  a  person  or  entity financially capable of carrying  out  its  terms,
 accompanied  by  a  certified or cashier's check for  at  least  10%  of  the
 purchase price.
 
     9.3  Option to Purchase.  For 30 days after the receipt of the Offer, the
 Members  shall determine whether or not they desire to purchase  the  Offered
 Interest for the purchase price, terms and conditions provided for in Section
 9.5.   If  some or all of the Members elect to purchase the Offered Interest,
 the  purchasing  Members may divide the Offered Interest in any  manner  upon
 which  they  all agree.  In the absence of unanimous agreement,  the  Offered
 Interest shall be divided among the purchasing Members in proportion to their
 Percentage Interests.
 
     9.4  Election to Dissolve Company.  In lieu of exercising their option to
 purchase  the  Offered Interest, the other Members may, by unanimous  consent
 and  written notice to the Transferring Member, elect to dissolve the Company
 voluntarily.  If the Members elect to dissolve the Company, its business  and
 affairs  shall be wound up and all its properties distributed in  liquidation
 under the provisions of Article XI.
     9.5   Purchase Price.  The purchase of the Offered Interest shall be upon
 one of the following alternatives:
 
          (a)   The same terms, conditions and consideration set forth in  the
 Third Party Offer; or
 
          (b)   If  the  transfer  pursuant to a Third Party  Offer  does  not
 involve the receipt by the Transferring Member of money or a promissory  note
 to  pay money, the purchasing Member(s) may purchase the Offered Interest for
 cash equal to the Transferring Member's capital account value.
 
          (c)  If there is no Third Party Offer, upon the terms and conditions
 and  at  a  purchase price set forth in the Offer (except  upon  Death  or  a
 Termination  of  Employment)  or,  at the  purchasing  Member(s)  option,  as
 determined in accordance with Article X.
 
          (d)   Upon  Death or a Termination of Employment, as  determined  in
 accordance with Article X.
 
     9.6  Release from Restriction.  If the Transferring Member offers to sell
 the  Offered  Interest in connection with a Third Party Offer and  the  other
 Members  do  not  elect to purchase the Offered Interest or to  dissolve  the
 Company,  then the Transferring Member may sell the Offered Interest  to  the
 bona  fide third party who made the Third Party Offer at a price equal to  or
 greater  than the price originally offered to the other Members, provided  it
 is  upon  the  exact terms and conditions originally contained in  the  Third
 Party Offer (except for changes in size of payments required to accommodate a
 greater  price), and provided further that such sale is completed  within  60
 days after the last Offer has been rejected by all of the Members or expires,
 whichever first occurs.
 
     9.7   Changed Offer.  If a Transferring Member thereafter desires to sell
 the  Offered  Interest  at a price which is less than  the  price  originally
 offered  to  the  other Members, or upon different terms or  conditions  than
 those  which were contained in the original Third Party Offer, or at  a  time
 which  is  more than 60 days after the rejection or expiration  of  the  last
 Offer, the Transferring Member must first reoffer the Offered Interest to the
 other  Members  at  the  price and upon the terms and  conditions  which  the
 Transferring  Member was willing to accept from the bona  fide  third  party.
 The  new Offer shall be made to the other Members in the same manner  and  in
 accordance with the same procedures as provided for in this Article IX.
 
     9.8  Form of Offer.  Offers and acceptances shall be in writing and shall
 be  served  either by personal service or by certified mail,  return  receipt
 requested,  addressed  to each of the Members at the last  known  address  as
 shown by the records of the Company.
 
     9.9   Substituted  Member.   Any assignee or  transferee  of  an  Offered
 Interest who is not now a Member shall become a Member only if (a) all of the
 other Members unanimously consent in writing to the admission of the assignee
 or  transferee as a Member, and (b) such assignee or transferee agrees (1) to
 become a Member, (2) to execute and acknowledge such instruments in form  and
 substance  satisfactory  to the other Members as are required  to  effectuate
 such  admission  to  the Company, (3) to be bound by all  of  the  terms  and
 conditions of this Agreement, as it may be amended from time to time, and (4)
 to pay all reasonable expenses connected with such assignee's or transferee's
 admission,  including reasonable attorneys' fees required for the preparation
 of  such instruments to effect such admission to the Company.  If all of  the
 other Members do not unanimously approve of the assignee or transferee of  an
 Offered Interest becoming a Member, such assignee or transferee shall only be
 entitled  to  receive the share of profits or other compensation  by  way  of
 income and the return of contributions to which the Transferring Member would
 have  been entitled, but shall have no right to participate in the management
 of the business and affairs of the Company or to become a Member.
 
     9.10  Option  on  the Part of Company.  Upon the unanimous  vote  of  the
 Members owning all of the Percentage Interests in the Company other than  the
 Transferring Member, the Company itself may elect to acquire the interest  of
 a  Transferring Member and to liquidate such Transferring Member's Membership
 Interest in the Company for the amount determined under Section 9.5  of  this
 Agreement.   In  the  event  that  the  Company  chooses  to  liquidate   the
 Transferring Member's Membership Interest, then the payments shall be  deemed
 to be made under Section 736(a) of the Code, and appropriate adjustment shall
 be  made to the amount of the payments to equalize the economic interests  of
 the parties.
 
    9.11 Termination of Employment.
 
          In  the  event  that the remaining Members and the  Company  do  not
 exercise  their options to acquire a Member's Membership Interest  upon  such
 Member's  Termination  of  Employment, such Member shall  automatically,  and
 without further action of the Company or such Member, cease to be a Member of
 the Company but shall continue to be entitled to receive the share of profits
 or  other  compensation by way of income and the return of  contributions  to
 which  he  was  entitled,  but  shall have no right  to  participate  in  the
 management of the business and affairs of the Company or to be a Member.
 
 
 ARTICLE XPURCHASE PRICE AND TERMS
 
     10.1  Purchase Price.  If so elected by the purchasing Member(s) pursuant
 to  Sections  9.5(c)  or  9.5(d),  the  purchase  price  hereunder  shall  be
 determined by appraisal as set forth in this Article.
 
     10.2  Appraisal.   The  fair  value of  the  Offered  Interest  shall  be
 determined by the written appraisal of a qualified appraiser agreed  upon  by
 the  parties.  If the parties cannot agree upon such an appraiser  within  30
 days  after  the  purchaser  is  required  to  purchase  the  Interest,   the
 Transferring Member and the purchaser shall each select an appraiser, the two
 appraisers shall agree upon a third appraiser, and the three appraisers shall
 determine  the value of the Offered Interest being purchased.  If  the  three
 appraisers cannot agree upon a value, the fair value of the Offered  Interest
 shall be determined by averaging the value determined by each appraiser,  and
 this  value will be final, binding and conclusive upon the parties.  The cost
 of  any  such  appraisal  shall be shared equally by the  purchaser  and  the
 Transferring Member (or the Transferring Member's legal representative).
 
     10.3 Terms of Purchase Price.  Subject to the provisions of Section 10.4,
 the  purchase price determined in this Article shall be paid as  the  parties
 shall  agree, and if the parties cannot agree, shall be payable  as  follows:
 (a)  10%  in  cash  or certified funds; and (b) the balance by  a  negotiable
 promissory note made by the Member or the Company, providing for (i) interest
 at a floating rate which is one percentage point higher than the "Prime Rate"
 published by the Wall Street Journal as the base rate on corporate  loans  of
 large U.S. money center commercial banks;  and (ii) equal monthly payments of
 principal  plus  accrued interest  shall be payable over  thirty-six  months,
 with the first payment due 30 days from the date of closing.
 
     10.4  Payment  in Cash.  Any payment required to be made by  the  Company
 under  this Article may, at the sole discretion of the Company, be  satisfied
 by  delivery of cash or certified funds, payable as set forth in Section 10.3
 above, delivered at the closing described in Section 10.5 below.
 
    10.5 Closing.
 
          (a)   Time  and Place of Closing.  The closing of any  purchase  and
 sale  of an Offered Interest pursuant to this Agreement shall be held at  the
 time  and place and in such manner mutually agreeable to the parties  to  the
 purchase.   In  the absence of agreement, the closing shall be  held  at  the
 principal  office  of the Company 60 days after the expiration  of  the  last
 option to purchase under the provisions of Article IX.
 
          (b)  Conditions to Closing.  The closing of any purchase and sale of
 an  Offered Interest hereunder is expressly conditioned upon compliance  with
 all  applicable  terms  and provisions of this Agreement,  including  without
 limitation those specified in Articles VIII, IX, and XIII.
 
 
 ARTICLE XI TERMINATION AND DISSOLUTION
 
     11.1  Grounds for Dissolution.  The Company shall be dissolved  upon  the
 occurrence of any of the following events:
 
         (a)  expiration of the period fixed for the duration of the Company;
 
         (b)  the unanimous written agreement of the Members;
 
         (c)  a decree of a court having competent jurisdiction;
 
         (d)  operation of law;
 
         (e)  total liquidation of all Company assets;
 
          (f)  upon the death, retirement, resignation, expulsion, bankruptcy,
 dissolution  or determination of incompetency of a Member, or the  occurrence
 of  any other act of a Member that terminates the continued membership  of  a
 Member  in  the Company (a "Withdrawal Event"), unless the remaining  Members
 holding  a majority of the Percentage Interests consent in writing within  90
 days after the Withdrawal Event to continue the Company; or
 
         (g)  upon an election of Members as provided in Section 9.4.
 
     11.2  Continuation  of Business Notwithstanding Dissolution.   While  the
 foregoing  Section describes events causing dissolution of the  Company,  the
 same shall in no way prevent any of the Members, not directly responsible for
 the occurrence of such event, from forming a new limited liability company in
 order to benefit by the continuation of the terms and conditions set forth in
 this Agreement.
 
     11.3  Dissolution  Procedure.  The procedure to  be  followed  after  the
 occurrence of one of the events causing dissolution, and the failure  of  all
 of  the  remaining Members to consent to continue the Company as provided  in
 Section 11.1(f), shall be as follows:
 
          (a)   the  Company shall execute a Statement of Intent to  Dissolve,
 duplicate originals of which shall be delivered to the Colorado Secretary  of
 State  as provided by the Act, whereupon the Company shall cease to carry  on
 its  business,  except to the extent necessary to wind up  its  business  and
 affairs;
 
         (b)  all Company assets shall be marshalled;
 
          (c)   all  outstanding  debts, expenses  and  liabilities  to  third
 parties shall be paid;
 
          (d)   all  debts to Members other than capital and profits shall  be
 paid;
 
          (e)   after  payment  of all of the foregoing  debts,  expenses  and
 liabilities,  Members  shall be paid in accordance  with  the  provisions  of
 Section 11.4; and
 
          (f)   the  Company shall execute Articles of Dissolution,  duplicate
 originals of which shall be filed in the office of the Colorado Secretary  of
 State as provided by the Act.
 
 <PAGE>
    11.4 Distributions in Liquidation.
 
          (a)  Priority of Distributions.  Upon liquidation of the Company  or
 (except  as provided in Treasury Regulation  1.704-1(b)(2)(ii)(b))  upon  the
 liquidation  of  any  Member's  Membership  Interest  in  the  Company,   all
 distributions  shall be made first in accordance with the  Members'  positive
 capital  account  balances,  as  determined after  taking  into  account  all
 adjustments to capital accounts for the Company's taxable year in  which  the
 liquidation  occurs,  other than adjustments made pursuant  to  this  Section
 11.4,  and  to  the  extent the distributions exceed the  aggregate  positive
 balances in the Members' capital accounts, then, among all of the Members pro
 rata in proportion to their respective Percentage Interests.  Notwithstanding
 the  foregoing  or any other provision of this Agreement unless  required  by
 Section   704(b)  of  the  Code  and  the  Treasury  Regulations  promulgated
 thereunder, no Member shall be entitled to receive a liquidating distribution
 with  respect to such Member's profits interest as established under  Section
 4.1(b)  above  in  excess of the amount by which the  aggregate  profits  and
 amount  realized credited to such Member under Sections 5.1(a) and (b)  above
 exceed  the  aggregate  distributions  received  by  such  Member  from   the
 commencement of the Company's operations.
 
          (b)  All distributions under this Section shall be made by the later
 of (1) the end of the taxable year of the Company in which the liquidation of
 the  Company, or any Member's interest, occurs, or (2) within 90  days  after
 the  date  of  the liquidation.  Notwithstanding anything to the contrary  in
 this  Agreement,  upon  a liquidation within the meaning  of  Section  1.704-
 1(b)(2)(ii)(g)  of the Treasury Regulations, if any Member's capital  account
 has   a   negative   balance  (after  giving  effect  to  all  contributions,
 distributions,  allocations  and other capital account  adjustments  for  all
 taxable years, including the year during which such liquidation occurs), such
 Member  shall  have no obligation to make any capital contribution,  and  the
 negative  balance of such Member's capital account shall not be considered  a
 debt  owed  by  such  Member to the Company or to any other  person  for  any
 purpose whatsoever.
 
         (c)  Definitions.  For purposes of this Section:
 
               (1)   the  taxable  year  of the Company  shall  be  determined
 without regard to Section 706(c)(2)(A) of the Code;
 
               (2)   a liquidation of a Member's interest in the Company shall
 be  deemed  to occur on the earlier of  (A) the date upon which  there  is  a
 liquidation of the Company, or (B) the date upon which there is a liquidation
 of  the  Members'  interest in the Company under Treasury Regulation   1.761-
 1(d); and
 
               (3)  a liquidation of the Company shall be deemed to occur upon
 the  earlier  of   (A)  the date upon which the Company is  terminated  under
   708(b)(1) of the Code, or (B) the date upon which the Company ceases to  be
 a  going concern (even though it may continue in existence for the purpose of
 winding  up  its  affairs, paying its debts, and distributing  any  remaining
 balance to the Members).
 
     11.5  Waiver  of  Partition - Dissolution and Withdrawal.   Each  of  the
 Members  hereby waives any and all right that each such Member  may  have  to
 maintain any action for partition with respect to his Membership Interest  or
 any  right such Member may have to force or compel dissolution of the Company
 except  in  accordance with this Agreement.  Each Member specifically  waives
 any rights such Member may now have or hereafter acquire to withdraw from the
 Company, and if, notwithstanding such waiver, a Member withdraws in violation
 of  this  Agreement,  the Company may, in addition to  exercising  any  other
 remedies  at  law or in equity, recover damages for breach of this  Agreement
 and  offset  such  damages  against amounts otherwise  distributable  to  the
 withdrawing Member.
 
 
 ARTICLE XII ARBITRATION
 
     The  Members  agree to submit all controversies, claims  and  matters  of
 difference  to  arbitration in Denver, Colorado, according to the  rules  and
 practices of the American Arbitration Association from time to time in force,
 except that if such rules and practices differ from the state rules of  civil
 procedure  or  any other provisions of state law then in effect,  such  state
 rules and law shall govern.  This submission and agreement to arbitrate shall
 be  specifically enforceable. Arbitration may proceed in the absence  of  one
 party  if notice of the proceeding has been given to such party.  The parties
 agree  to abide by all awards rendered in such proceedings. Such awards shall
 be  final and binding on all parties to the extent and in the manner provided
 by  the  state  rules of civil procedure.  All awards may be filed  with  the
 clerk  of one or more courts, state or federal, having jurisdiction over  the
 party  against  whom such award is rendered or such party's  property,  as  a
 basis  of  judgment and of the issuance of execution for its collection.   No
 party  shall  be  considered  in default hereunder  during  the  pendency  of
 arbitration proceedings relating to such default.
 
 
 ARTICLE XIII INVESTMENT REPRESENTATIONS
 
     13.1  Interests  Not  Registered.  The Members understand  that  (a)  the
 Membership  Interests evidenced by this Agreement have  not  been  registered
 under the Securities Act of 1933, as amended, the Colorado Securities Act, as
 amended,  or  any  other state or foreign securities laws (collectively,  the
 "Securities  Acts") because the Company is issuing such Membership  Interests
 in  reliance upon the exemptions from the registration  requirements  of  the
 Securities Acts providing for issuance of securities not involving  a  public
 offering,  (b)  the  Company has relied upon the fact  that  such  Membership
 Interests  are  to be held by each Member for investment, and  (c)  exemption
 from  registrations under the Securities Acts would not be available if  such
 Membership Interests were acquired by a Member with a view to distribution.
 
     13.2  Investment  Representation.  Each Member  hereby  confirms  to  the
 Company that such Member is acquiring the Membership Interests in the Company
 for  such  own Member's account, for investment, and not with a view  to  the
 resale or distribution thereof.  Each Member agrees not to transfer, sell  or
 offer  for sale any portion of his Membership Interest in the Company  unless
 there  is  an effective registration or other qualification relating  thereto
 under  the Securities Act of 1933, as amended (the "'33 Act"), and under  any
 applicable  state  or foreign securities laws or unless the  holder  of  such
 Membership  Interest  in the Company delivers to the Company  an  opinion  of
 counsel,  satisfactory  to  the  Company, that  such  registration  or  other
 qualification  under the '33 Act and applicable state or  foreign  securities
 laws  is not required in connection with such transfer, sale or offer.   Each
 Member  understands that the Company is under no obligation to  register  the
 Membership  Interests in the Company or to assist such  Member  in  complying
 with any exemption from registration under the Securities Acts if such Member
 should  at  a  later date wish to dispose of his Membership Interest  in  the
 Company.   Each Member recognizes that exemptions from registration,  in  any
 case,  are limited and may not be available when the Member may wish to sell,
 transfer or otherwise dispose of any of the Member's Membership Interests  in
 the Company.
 
     13.3  Further Representations.  Prior to acquiring a Membership  Interest
 in  the Company, each Member has made an investigation of the Company and its
 business  and acknowledges that the Company has made available to  each  such
 Member all information with respect thereto which such Member needed to  make
 an  informed  decision  to  acquire  his Membership  Interest.   Each  Member
 represents that he possesses the experience and sophistication as an investor
 which  are  adequate  for  the evaluation of the merits  and  risks  of  such
 Member's investment in the Company as a Member.
 
 
 ARTICLE XIV GENERAL MATTERS
 
     14.1 Governing Law.  This Agreement shall be governed by and construed in
 accordance with the laws of the State of Colorado.
 
     14.2  No Waiver.  No provision of this Agreement may be waived except  by
 an  agreement in writing signed by the waiving Member.  A waiver of any  term
 or  provision  shall  not  be construed as a waiver  of  any  other  term  or
 provision.
 
     14.3 Amendment.  This Agreement may be amended, altered or revoked at any
 time, in whole or in part, by filing with this Agreement a written instrument
 setting forth such amendment, alteration or revocation signed by all  of  the
 Members.
 
     14.4  Binding Effect.  This Agreement shall be binding upon  the  Members
 and their respective heirs, personal representatives, successors and assigns.
 
     14.5  Construction; Definitions.  Throughout this Agreement the  singular
 shall include the plural, the plural shall include the singular, and the  use
 of  any  gender shall include all genders, wherever the context so  requires.
 Terms used, but not defined, in any Schedule to this Agreement shall have the
 meanings assigned to such terms in this Agreement.
 
     14.6 Text To Control.  The headings of articles and sections are included
 solely for convenience of reference.  If any conflict between any heading and
 the text of this Agreement exists, the text shall control.
 
     14.7 Severability.  If any provision of this Agreement is declared by any
 court of competent jurisdiction to be invalid for any reason, such invalidity
 shall  not affect the remaining provisions.  Such remaining provisions  shall
 be  fully severable, and this Agreement shall be construed and enforced as if
 such invalid provisions never had been inserted in this Agreement.
 
     14.8  Notices.  Except as expressly provided otherwise in this Agreement,
 all  notices required or permitted by this Agreement shall be in writing  and
 shall  be  served either by personal delivery or by certified  or  registered
 mail, return receipt requested, addressed as set forth on the signature  page
 hereof  as to each Member (except that any Member may from time to time  give
 notice  in  accordance  with  this provision to  the  Company  changing  such
 Member's address for that purpose) and as set forth in Section 1.3 as to  the
 Company.  Such notice shall be effective on the date of personal delivery  or
 on the third day after mailing.
 
     14.9  Entire Agreement.  This Agreement embodies the entire understanding
 and agreement among the parties concerning the Company and supersedes any and
 all prior negotiations, understandings or agreements in regard thereto.
 
     14.10      Counterparts.   This  Agreement may  be  executed  in  several
 counterparts,  each of which shall be an original, but all of which  together
 shall constitute one and the same instrument.
 
     The  parties  hereby execute this Agreement on the respective  dates  set
 forth next to their signatures below, effective as of September 20, 1996.
 
 
                             MEMBERS:
 
                             ADA-ES, INC.
 
 April 30, 1997              By:  /s/  Michael D. Durham
 
                             Address:  304 Inverness Way South, Suite 365
                                       Englewood, Colorado  80112
 
 
                             EARTH SCIENCES, INC.
 
 April 30, 1997              By:   /s/ Mark H. McKinnies
 
                             Address:  910 12th Street
                                       Golden, Colorado  80401
 
 <PAGE>
 
 SCHEDULE A
 
                            TO OPERATING AGREEMENT OF
                         ADA ENVIRONMENTAL SOLUTIONS LLC
                                        
     The  capital  contribution  by each Member  to  the  Company  as  of  the
 execution of this Amended and Restated Operating Agreement is as follows:
<TABLE>
 
<S>            <C>          <C>           <C>         <C>          <C>           <C>
   Member       Cash        Promissory    Adjusted    Fair         Fair          Percen
                Capital     Note          Basis of    Market       Market         tage
                Contribut                 Contribut   Value of     Value of      Inter
                 ion                       ed         Contributed  Capital         est
                                          Property    Property     Contribution
ADA-ES, Inc.      $   20.00   $      0.00      $0.00  $500,000.00  $  500,020.00 49%
Earth Sciences,
 Inc.            900,000.00  1,600,000.00       0.00         0.00  $2,500,000.00 51%
 
 </TABLE>
 
 <PAGE>
 
                                                                    SCHEDULE B
                            TO OPERATING AGREEMENT OF
                         ADA ENVIRONMENTAL SOLUTIONS LLC
                                        
    For purposes of interpreting and implementing Article V of the Operating
 Agreement of ADA Environmental Solutions LLC (the "Agreement"), and except as
 otherwise required under Section 704(b) of the Code and the Treasury
 Regulations promulgated thereunder, the following rules shall apply and shall
 be treated as part of the terms of the Agreement:
 
 Part A.  Special Allocation Provisions.
 
         1.   For purposes of determining the amount of gain or loss to be
 allocated pursuant to Article V of the Agreement, any basis adjustments
 permitted pursuant to Section 743 of the Code shall be disregarded.
 
         2.   Company income, loss, deductions, and credits shall be
 allocated to the Members in accordance with the portion of the year during
 which the Members have held their respective interests.  All items of income,
 loss, deductions, and credits shall be considered to have been earned ratably
 over the period of the fiscal year of the Company, except that gains and
 losses arising from the disposition of assets shall be taken into account as
 of the date hereof.
 
         3.   Notwithstanding any other provision of the Agreement, to the
 extent required by law, income, gain, loss, and deduction attributable to
 property contributed to the Company by a Member shall be shared among the
 Members so as to take into account any variation between the basis of the
 property and the fair market value of the property at the time of
 contribution in accordance with the requirements of Section 704(c) of the
 Code and the applicable Treasury Regulations promulgated thereunder as more
 fully described in Part B hereof.
 
         4.   Notwithstanding any other provision of the Agreement, in the
 event the Company is entitled to a deduction for interest imputed under any
 provision of the Code on any loan or advance from a Member (whether such
 interest is currently deducted, capitalized, or amortized), such deduction
 shall be allocated solely to such Member.
 
         5.   Notwithstanding any provision of the Agreement to the contrary,
 to the extent any payments made to a Member and deducted by the Company in
 reliance on Section 707(a) or 707(c) of the Code are treated as distributions
 to a Member for federal income tax purposes, there will be a gross income
 allocation to such Member in the amount of such distribution.
 
         6.   (a)  Notwithstanding any provision of the Agreement to the
 contrary and subject to the exceptions set forth in Section 1.704-2(f) (2) -
 (5) of the Treasury Regulations, if there is a net decrease in Partnership
 Minimum Gain during any fiscal year of the Company, each Member shall be
 specially allocated items of Company income and gain for such year (and, if
 necessary, subsequent years) in an amount equal to such Member's share of the
 net decrease in Partnership Minimum Gain determined in accordance with
 Section 1.704-2(g)(2) of the Treasury Regulations.  Allocations pursuant to
 the previous sentence shall be made in proportion to the respective amounts
 required to be allocated to each Member pursuant thereto.  The items to be so
 allocated shall be determined in accordance with Sections 1.704-2(f) and
 1.704-2(j) of the Treasury Regulations.  This paragraph 6(a) is intended to
 comply with the minimum gain chargeback requirement in Section 1.704-2(f) of
 the Treasury Regulations and shall be interpreted consistently therewith.  To
 the extent permitted by such Section of the Treasury Regulations and for
 purposes of this paragraph 6(a) only, each Member's Adjusted Capital Account
 Balance shall be determined prior to any other allocations pursuant to
 Article V of the Agreement with respect to such fiscal year and without
 regard to any net decrease in Partner Minimum Gain during such fiscal year.
 
              (a)  Notwithstanding any provision of the Agreement to the
 contrary, except paragraph 6(a) of this Schedule, and subject to the
 exceptions set forth in Section 1.704-2(i)(4) of the Treasury Regulations, if
 there is a net decrease in Partner Nonrecourse Debt Minimum Gain during any
 fiscal year, each Member who has a share of the Partner Nonrecourse Debt
 Minimum Gain, determined in accordance with Section 1.704-2(i)(5) of the
 Treasury Regulations, shall be specially allocated items of Company income
 and gain for such year (and, if necessary, subsequent years) in an amount
 equal to such Member's share of the net decrease in Partner Nonrecourse Debt
 Minimum Gain, determined in accordance with Section 1.704-2(i)(5) of the
 Treasury Regulations.  Allocations pursuant to the previous sentence shall be
 made in proportion to the respective amounts required to be allocated to each
 Member pursuant thereto.  The items to be so allocated shall be determined in
 accordance with Sections 1.704-2(i)(4) and 1.704-2(j) of the Treasury Regula
 tions.  This paragraph 6(b) is intended to comply with the minimum gain
 chargeback requirement in Section 1.704-2(i)(4) of the Treasury Regulations
 and shall be interpreted consistently therewith.  Solely for purposes of the
 paragraph 6(b), each Member's Adjusted Capital Account Balance shall be
 determined prior to any other allocations pursuant to Article V of the
 Agreement with respect to such fiscal year, other than allocations pursuant
 to 6(a) hereof.
 
         7.   Notwithstanding any provision of the Agreement to the contrary,
 in the event any Members unexpectedly receive any adjustments, allocations,
 or distributions described in Treasury Regulation Section
 1.704-1(b)(2)(ii)(d)(4), 1.704-1(b)(2)(ii)(d)(5), or 1.704-1(b)(2)(ii)(d)(6),
 items of Company income and gain shall be specially allocated to such Members
 in an amount and manner sufficient to eliminate the deficits in their
 Adjusted Capital Account Balances created by such adjustments, allocations,
 or distributions as quickly as possible.  This paragraph 7 is intended to
 comply with the Qualified Income Offset provisions of the aforementioned
 Treasury Regulations.
 
         8.   No net loss shall be allocated to any Member to the extent that
 such allocation would result in a deficit Adjusted Capital Account Balance in
 such Member's capital account while any other Member continues to have a
 positive capital account balance; in such event, net losses shall first be
 allocated to any Members with positive Adjusted Capital Account Balances, and
 in proportion to such positive balances, to the extent necessary to reduce
 their positive Adjusted Capital Account Balances to zero.
 
         9.   Any special allocations of items pursuant to this Part A shall
 be taken into account in computing subsequent allocations so that the net
 amount of any items so allocated and the remaining profits, losses, and all
 other items allocated to each such Member pursuant to Article V of the
 Agreement shall, to the extent possible, be equal to the net amount that
 would have been allocated to each such Member pursuant to the provisions of
 Article V of the Agreement if such special allocations had not occurred.
 
         10.  Notwithstanding any provision of the Agreement to the contrary,
 Nonrecourse Deductions for any fiscal year or other period shall be specially
 allocated to the Members in accordance with their Percentage Interests.
 
         11.  Notwithstanding any provision of the Agreement to the contrary,
 any Partner Nonrecourse Deduction for any fiscal year shall be specially
 allocated to the Member who bears the economic risk of loss with respect to
 the Partner Nonrecourse Debt to which such Partner Nonrecourse Deductions are
 attributable in accordance with Section 1.704-2(i) of the Treasury
 Regulations.
 
 Part B.  Capital Account Adjustments and 704(c) Tax Allocations.
 
         1.   For purposes of computing the amount of any item of income,
 gain, deduction, or loss to be reflected in the Members' capital accounts,
 the determination, recognition, and classification of any such item shall be
 the same as its determination, recognition, and classification for federal
 income tax purposes; provided, however, that:
 
              (a)  Any deductions for depreciation, cost recovery, or
 amortization (other than depletion under Section 611 of the Code)
 attributable to a Contributed Property shall be determined as if the adjusted
 basis of such property on the date it was acquired by the Company was equal
 to the Agreed Value of such property.  Upon an adjustment to the Carrying
 Value of any Company property, except property subject to depletion under
 Section 611 of the Code, further deductions for such depreciation, cost
 recovery, or amortization attributable to such property shall be determined
 as if the adjusted basis of such property was equal to the Carrying Value of
 such property immediately following such adjustment.
 
              (b)  Any income, gain, or loss attributable to the taxable
 disposition of any property (including any property subject to depletion
 under Section 611 of the Code) shall be determined by the Company as if the
 adjusted basis of such property as of such date of disposition was equal in
 amount to the Company's Carrying Value with respect to such property as of
 such a date.
 
              (c)  If the Company's adjusted basis in a depreciable or cost
 recovery property is reduced for federal income tax purposes pursuant to
 Section 50(c)(1) of the Code, the amount of such reduction shall, solely for
 purposes hereof, be deemed to be an additional depreciation or cost recovery
 deduction in the year such property is placed in service and shall be
 allocated among the Members pursuant to Article V of the Agreement.  Any
 restoration of such basis pursuant to Section 50(c)(2) of the Code shall be
 allocated in the same manner to the Members to whom such deemed deduction was
 allocated.
 
              (d)  The computation of all items of income, gain, loss, and
 deduction shall be made by the Company and, as to those items described in
 Section 705(a)(1)(B) or Section 705(a)(2)(B) of the Code, without regard to
 the fact that such items are not includable in gross income or are neither
 currently deductible nor capitalizable for federal income tax purposes.
 
         2.   A transferee of a Member's interest will succeed to the capital
 account relating to the Member's interest transferred; provided, however,
 that if the transfer causes a termination of the Company under Section
 708(b)(1)(B) of the Code, the Company properties shall be deemed to have been
 distributed in liquidation of the Company to the Members (including the
 transferee of an interest) and recontributed by such Members and transferees
 in reconstitution of the Company. The capital accounts of such reconstituted
 Company shall be maintained in accordance with the principles set forth
 herein.
 
         3.   Upon an issuance of any additional interests in the Company for
 cash or Contributed Property, the capital accounts of all Members (and the
 Carrying Values of all Company properties) shall, immediately prior to such
 issuance, be adjusted (consistent with the provisions hereof) upward or
 downward to reflect any unrealized gain or unrealized loss attributable to
 each Company property (as if such unrealized gain or unrealized loss had been
 recognized upon an actual sale of such property at the fair market value
 thereof, immediately prior to such issuance, and had been allocated to the
 Members, at such time, pursuant to Article V of the Agreement).  In
 determining such unrealized gain or unrealized loss attributable to the
 properties, the fair market value of Company properties shall be determined
 by the Members using such reasonable methods of valuation as the Members may
 adopt.
 
         4.   Immediately prior to the distribution of any Company property
 in liquidation of the Company, the capital accounts of all Members (and the
 Carrying Values of all Company properties) shall be adjusted (consistent with
 the provisions hereof and Section 704 of the Code) upward or downward to
 reflect any unrealized gain or unrealized loss attributable to each Company
 property (as if such unrealized gain or unrealized loss had been recognized
 upon an actual sale of each such property, immediately prior to such
 distribution, and had been allocated to the Members, at such time, pursuant
 to Article V of the Agreement).  In determining such unrealized gain or
 unrealized loss attributable to the properties, the fair market value of
 Company properties shall be determined by the Members using such reasonable
 methods of valuation as the Members may adopt.
 
         5.   In accordance with Section 704(c) and the Treasury Regulations
 promulgated thereunder, income, gain, loss, and deduction with respect to any
 Contributed Property shall, solely for tax purposes, be allocated among the
 Members so as to take account of any variation between the adjusted basis of
 such property to the Company for federal income tax purposes and its Agreed
 Value.
 
         6.   In the event the Agreed Value of any Company asset is adjusted
 as described in paragraph 3 or 4 of this Part B above, subsequent allocations
 of income, gain, loss, and deduction with respect to such asset shall take
 account of any variation between the adjusted basis of such asset for federal
 income tax purposes and its Agreed Value in the same manner as under Section
 704 (c) of the Code and the Treasury Regulations promulgated thereunder.  Any
 unrealized income or deduction with respect to accounts receivable, accounts
 payable, and any other accrued but unpaid items that a Member contributes to
 the Company shall be allocated to such Member to the extent required by
 Sections 704(c) of the Code and the Treasury Regulations promulgated under
 Sections 704(b) and 704(c) of the Code.
 
         7.   Any elections or other decisions relating to any federal income
 tax matters shall be made by the Members in any manner that reasonably
 reflects the purpose and intention of the Agreement.
 
 Part C. Definitions.  For the purposes of this Schedule, the following terms
 shall have the meanings indicated unless the context clearly indicates
 otherwise:
 
         "Adjusted Capital Account Balance" means the balance, if any, in the
 capital account balance of a Member as of the end of the relevant fiscal year
 of the Company, after giving effect to the following:  (a) credit to such
 capital account any amounts the Member is obligated to restore, pursuant to
 the terms of this Agreement or otherwise or is deemed obligated to restore
 pursuant to the penultimate sentences of Sections 1.704-2(g)(1) and 1.704-
 2(i)(5) of the Treasury Regulations and (b) debit to such capital account the
 items described in Sections 1.704-1(b)(2)(ii)(d)(4), (5), and (6) of the
 Treasury Regulations.
 
         "Agreed Value" means the fair market value of Contributed Properties
 as agreed to by the contributing Member and the Company, using such
 reasonable method of valuation as they may adopt.
 
         "Carrying Value" means (a) with respect to Contributed Property, the
 Agreed Value of such property reduced (but not below zero) by all
 amortization, depreciation, and cost recovery deductions charged to the
 Members' capital accounts with respect to such property, as well as any other
 charges for sales, retirements, and other dispositions of assets included in
 a Contributed Property, as of the time of determination, and (a) with respect
 to any other property, the adjusted basis of such property for federal income
 tax purposes as of the time of determination.  The Carrying Value of any
 property shall be adjusted in accordance with the principles set forth
 herein.
 
         "Contributed Property" means each Member's interest in property or
 other consideration (excluding services and cash) contributed to the Company
 by such Member.
 
         "Nonrecourse Deductions" shall have the meaning set forth in Section
 1.704-2(b)(1) of the Treasury Regulations. The amount of Nonrecourse
 Deductions for a fiscal year of the Company equals the excess, if any, of the
 net increase, if any, in the amount of Partnership Minimum Gain during that
 fiscal year over the aggregate amount of any distributions during that fiscal
 year of proceeds of a Nonrecourse Liability that are allocable to an increase
 in Partnership Minimum Gain, determined according to the provisions of
 Section 1.704-2(c) of the Treasury Regulations.
 
         "Nonrecourse Liability" shall have the meaning set forth in Section
 1.704-2(b)(3) of the Treasury Regulations.
 
         "Partner Minimum Gain" means an amount, with respect to each Partner
 Nonrecourse Debt, equal to the Partnership Minimum Gain that would result if
 such Partner Nonrecourse Debt were treated as a Nonrecourse Liability,
 determined in accordance with Section 1.704-2(i) of the Treasury Regulations.
 
         "Partner Nonrecourse Debt" shall have the meaning set forth in
 Section 1.704-2(b)(4) of the Treasury Regulations.
 
         "Partner Nonrecourse Debt Minimum Gain" means an amount, with
 respect to each Partner Nonrecourse Debt, determined in accordance with
 Section 1.704-2(i) of the Treasury Regulations.
 
         "Partner Nonrecourse Deductions" shall have the meaning set forth in
 Section 1.704-2(i)(1) of the Treasury Regulations.  For any Company taxable
 year, the amount of Partner Nonrecourse Deductions with respect to a Partner
 Nonrecourse Debt equals the net increase during the year, if any, in the
 amount of Partner Nonrecourse Debt Minimum Gain reduced (but not below zero)
 by proceeds of the liability that are both attributable to the liability and
 allocable to an increase in the Partner Nonrecourse Debt Minimum Gain.
 
         "Partnership Minimum Gain" shall have the meaning set forth in
 Sections 1.704-2(b)(2) and 1.704-2(d) of the Treasury Regulations.
 
    For purposes of this Schedule, all other capitalized terms will have the
 same definition as in the Agreement.
 
    This Schedule B is intended to comply with Section 704(b) of the Code and
 the Treasury Regulations promulgated thereunder and shall be construed and
 interpreted consistently therewith.  To the extent that any of the provisions
 of this Schedule B are inconsistent (whether now or in the future) with
 Section 704(b) of the Code and the Treasury Regulations promulgated
 thereunder, the provisions of such Section of the Code and such Treasury
 Regulations shall control, and all allocations and capital account
 adjustments made under this Schedule B and the Agreement shall be made in a
 manner necessary to comply with Section 704(b) of the Code and the Treasury
 Regulations promulgated thereunder.
 
 <PAGE>
 
 
 EXHIBIT 99.1   FINANCIAL STATEMENTS OF ADA ENVIRONMENTAL SOLUTIONS
 LLC,DECEMBER 31, 1996
 
 
                         ADA ENVIRONMENTAL SOLUTIONS LLC
                          (A DEVELOPMENT STAGE COMPANY)
                                        
                                        
                                table of contents
                                        
                                        
                                                             Page
 
 Independent Auditors' Report                                 3
 
 Balance Sheet                                                4
 
 Statement of Operations and Members' Deficit                 5
 
 Statement of Cash Flows                                      6
 
 Notes to Financial Statements                                7
                                        
 <PAGE>
                                        
 BDO Seidman, LLP
 Accountants and Consultants
 17th & Grant Building
 303 East Seventeenth Avenue, Suite 600
 Denver, Colorado  80203-9682
 Telephone:  (303) 830-1120
 Fax:  (303) 830-8130
 
 INDEPENDENT AUDITORS' REPORT
 
 
 ADA Environmental solutions LLC
 Englewood, Colorado
 
 We have audited the accompanying balance sheet of ADA Evironmental Solutions
 LLC (a development stage company) as of December 31, 1996 and the related
 statement of operations, members' deficit and cash flows for the ten months
 hen ended.  These financial statement are the responsibility of the Company's
 management.  Our responsibility is to express an opinion on these financial
 statements based on our audit.
 
 We conducted our audit 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 audit provides a
 reasonable basis for our opinion.
 
 In our opinion, the financial statements referred to above present fairly, in
 all material respects, the financial position of ADA Environmental Solutions
 LLC (a development stage company) as of December 31, 1996 and the results of
 its operation and cash flows for the ten months then ended, in conformity
 with generally accepted accounting principles.
 
 /s/ BDO Seidman, LLP
 
 Denver, Colorado
 April 10, 1997
 
 <PAGE>
 <TABLE>
 <CAPTION>
 
                                        
                         ADA Environmental Solutions LLC
                          (A Development Stage Company)
                                  Balance Sheet
                                December 31, 1996
 
 <S>                                        <C>
 ASSETS
 Cash                                       $ 11,950
 Trade receivables (Notes 2 and 3)            11,355
 Prepaid assets                                2,559
                                              ------
       Total currents assets                  25,864
 
 Preproduction costs                         324,008
 
 Furniture and equipment (Note 3),
 net of $1,154 accumulated
 depreciation                                 14,448
 
 Other assets                                    729
                                              ------
 Total Assets                               $365,049
                                             =======
 
 LIABILITIES
 Accounts payable                           $ 11,217
 
 Note payable - member (Note 3)              779,443
                                             -------
 Total Liabilities                           790,660
 
 Commitments (Note 8)
 
 MEMBERS' DEFICIT                           (425,611)
                                             -------
 Total Liabilities and Members' Deficit     $365,049
                                             =======
 </TABLE>
 
                                        
                 See accompanying notes to financial statements.
                                        
 <PAGE>
 <TABLE>
 <CAPTION>
 
                         ADA Environmental Solutions LLC
                          (A Development Stage Company)
                  Statement of Operations and Members' Deficit
                       Ten Months Ended December 31, 1996
                                        
                                        
 <S>                                      <C>
 Revenues (Note 4)                        $ 75,487
 
 Costs and Expenses:
 Direct cost of revenue                     53,977
 Indirect expenses                         413,085
                                            -------
 Loss from operations                     (391,575)
 
 Interest expense                          (34,056)
                                            -------
 Net loss                                 (425,631)
 
 Beginning members' equity                        0
 
 Members' contribution                          20
                                            -------
 Ending members' deficit                  ($425,611)
                                            =======
 </TABLE>
 
 
                 See accompanying notes to financial statements.
 
 <PAGE>
 <TABLE>
 <CAPTION>
                         ADA Environmental Solutions LLC
                          (A Development Stage Company)
                             Statement of Cash Flows
                       Ten Months Ended December 31, 1996
 
 <S>                                          <C>
 Cash flows from operating activities:
 Cash received from                          $    64,132
 Cash paid to suppliers and  employees          (454,691)
 Cash paid for prepaid expenses                   (2,559)
 Interest paid                                   (34,056)
                                                 -------
    Net cash used in operating activities       (427,174)
 
 Cash flows from investing activities:
 Capital expenditures                            (15,602)
 Preproduction costs                            (324,008)
   Increase in other assets                         (729)
                                                 -------
    Net cash used in investing activities       (340,339)
 
 Cash flows from financing activities:
 Borrowings from member                          779,443
 Members contribution                                 20
                                                 -------
 Net cash provided by financing activities       779,463
 
 Net increase in cash                             11,950
 Cash, beginning of period                           -0-
                                                 -------
 Cash, end of period                           $  11,950
                                                 =======
 Reconciliation of net loss to net
 cash used in operating activities:
 
 Net loss                                      ($425,631)
 
 Adjustments to reconcile net loss to net
 cash used in operating activities:
 Depreciation                                      1,154
    Change in assets and liabilities -
      Increase in trade receivables              (11,355)
   Increase in accounts payable and
       accrued liabilities                        11,217
   Increase in prepaid expenses                   (2,559)
                                                  ------
    Net cash used in operating activities      ($427,174)
                                                 =======
 </TABLE>
 
 
                 See accompanying notes to financial statements.
                                        
                                        
                                        
 <PAGE>
 
 
                          NOTES TO FINANCIAL STATEMENTS
                                        
                                        
 NOTE 1 - OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
 Nature of Operations
 
 In  March  1996, ADA Environmental Solutions LLC ("ADA ES" or the  "Company")
 was  established  to evaluate, design, install, and operate/maintain  certain
 pollution control equipment and chemical additive systems primarily  for  use
 in the power utility industry.
 
 Owners  and Limited Liability Companies are referred to as "members" and  the
 company  executives  are  referred to as "managers".   The  managers  receive
 authority to act from Operating Agreements which are signed by all members.
 
 In  1996,  ADA  ES  was  considered  a Development  Stage  Company  producing
 insignificant  revenue while developing the necessary scale-up processes  and
 structure to sustain planned full scale operations.
 
 Furniture and Equipment
 
 Furniture and equipment are recorded at cost. Provisions for depreciation are
 computed using an accelerated method over estimated useful lives of three  to
 seven years.
 
 Use of Estimates
 
 The  preparation  of the Company's financial statements, in  conformity  with
 generally  accepted accounting principles, requires the Company's  management
 to  make estimates and assumptions that affect the amounts reported in  these
 financial  statements  and accompanying notes.  Actual results  could  differ
 from those estimates.
 
 PREPRODUCTION COSTS
 
 The  Company capitalized costs of $324,000 in 1996 associated with full scale
 production  process development for ADA Environmental Solutions  LLC.   These
 costs   include   scale-up  development,  production  designs,   and   vendor
 establishment/evaluations, and will start being amortized over 5  years  once
 full scale systems are in place and operational.
 
 CONCENTRATION OF RISK
 
 Profitable operations of the Company are contingent upon a single proprietary
 process.   This  process has been proven successful in  both  laboratory  and
 extended  full-scale  demonstration operations.  Should  this  technology  be
 obsoleted  or  be caused to be unsuccessful, the ability of  the  Company  to
 succeed would be at risk.
 
 NOTE 2 - ACCOUNTS RECEIVABLE
 
 Accounts receivable consist of the following:
 
    Billed                         $ 6,981
    Unbilled                         4,374
                                    ------
                                   $11,355
                                    ======
 Unbilled accounts receivable consist of revenue which has been recognized but
 which, because of the terms of the contract, has not yet been billed.
 
 NOTE 3 -NOTE PAYABLE-MEMBER
 
 AT DECEMBER 31, 1996, THE COMPANY HAD A LINE OF CREDIT FROM A MEMBER TOTALING
 $850,000.  THIS LINE IS SUBJECT TO RENEWAL ON MAY 10, 1997.  AT DECEMBER 31,
 1996, THE COMPANY HAD $779,443 OUTSTANDING AGAINST THIS LINE OF CREDIT.
 INTEREST ACCRUES AT 1% ABOVE A LOCAL BANK'S PRIME RATE.  INTEREST ACCRUES
 MONTHLY.  AT DECEMBER 31, 1996, THE INTEREST RATE WAS 9.25%.  BORROWINGS
 OUTSTANDING UNDER THE AGREEMENT ARE SECURED BY UNDIVIDED INTERESTS IN ALL THE
 COMPANY'S FIXED ASSETS AND ACCOUNTS RECEIVABLE.
 
 NOTE 4 - DEVELOPMENT STAGE OPERATIONS
 
 The  Company  commenced development stage operations when  ADA  Technologies,
 Inc. (ADA), the parent company, contributed technology in exchange for rights
 to the first $500,000 of profits, all the losses and 80% of the equity in the
 Company.  The remaining 20% equity was obtained by key employees at a nominal
 amount.   During  1996  the  Company  was devoted  to  scale-up  development,
 production  engineering, and supplier establishment/evaluation.  The  Company
 expects to commence production operations in 1997.
 
 NOTE 5 - INCOME TAXES
 
 ADA ES is a Limited Liability Company which elected to be taxed as a
 partnership under provisions of the Internal Revenue Code.  Accordingly,
 income tax provisions (and benefits) are not reflected in the financial
 statements since the Company's results of operations will be reported in the
 income tax returns of the members.
 NOTE 6 - INCOME/LOSS ALLOCATIONS
 
 The  Limited  Liability Operating Agreement provides for ADA to be  allocated
 all  losses  of  the  Company and initial profits up to  $500,000.   Minority
 interest  members receive proportionate interests in all profits,  after  ADA
 has received the first $500,000.
 
 NOTE 7 - RELATED PARTY TRANSACTIONS
 
 ADA employs the entire work force for the Company and loans the employees  to
 ADA  ES  at  costs  which  are fully burdened as  computed  from  the  parent
 company's  books and records.  The parent company provided all the  necessary
 working capital financing for ADA ES (see Note 3).
 
 
 NOTE 8 - COMMITMENTS
 
 The  Company  has non-cancelable long-term lease agreements for demonstration
 and  production equipment.  Rent expense was approximately $10,000  in  1996.
 Future  minimum lease payments required under long-term operating  leases  in
 effect at December 31, 1996, require the following payments:
 
                     1997          $  63,000
                     1998          $  63,000
                     1999          $  61,000
                     2000          $  59,000
                     2001          $  49,000
 
 NOTE 9 - SUBSEQUENT EVENT
 
 IN FEBRUARY 1997, THE COMPANY AND ITS MEMBERS ENTERED INTO AN AGREEMENT WITH
 EARTH SCIENCES, INC. ("ESI"), A PUBLICLY HELD CORPORATION, WHICH PROVIDED FOR
 ESI TO PURCHASE EQUITY IN ADA ES.  THE TOTAL INVESTMENT IN ADA ES BY ESI WILL
 BE UP TO $2.5 MILLION IN CASH CONTRIBUTIONS AND LOANS.  THIS SAME AGREEMENT
 PROVIDES FOR ESI TO ACQUIRE, DIRECTLY OR INDIRECTLY, ALL THE EQUITY IN ADA ES
 FOR 1,715,600 SHARES OF ESI STOCK HAVING A MARKET VALUE AT MARCH 31, 1997 OF
 APPROXIMATELY $5.1 MILLION.  THIS TRANSACTION IS PLANNED TO BE COMPLETED IN
 1998.
 
 TO FACILITATE THE ACQUISITION, A CORPORATION (ADA-ES, INC.) WAS ESTABLISHED
 IN MARCH 1997.  ALL THE MEMBERSHIP INTERESTS IN ADA ES WERE EXCHANGED FOR
 SHARES OF STOCK IN ADA-ES, INC.
 



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