------------------------- UNITED STATES OMB APPROVAL SECURITIES AND EXCHANGE COMMISSION ------------------------- WASHINGTON, D.C. 20549 OMB Number: 3235-0145 Expires: October 31, 2002 SCHEDULE 13D Estimated average burden hours per response..14.90 ------------------------- UNDER THE SECURITIES EXCHANGE ACT OF 1934 (AMENDMENT NO. 4)* Pure Cycle Corporation - -------------------------------------------------------------------------------- (Name of Issuer) Common Stock - -------------------------------------------------------------------------------- (Title of Class of Securities) 746228 10 5 - -------------------------------------------------------------------------------- (CUSIP Number) George M. Middlemas, 225 W. Washington, Suite 1450, Chicago, IL 60606 312-857-2800 - -------------------------------------------------------------------------------- (Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications) August 29, 2000 - -------------------------------------------------------------------------------- (Date of Event which Requires Filing of this Statement) If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of Sections 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box / /. NOTE: Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits. See Section 240.13d-7(b) for other parties to whom copies are to be sent. *The remainder of this cover page shall be filled out for a reporting person's initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover page. The information required on the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes). SCHEDULE 13D - ---------------------- ---------------------------- CUSIP NO. 746228 10 5 PAGE 2 OF 13 PAGES - ---------------------- ---------------------------- - -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSONS. I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY) Apex Investment Fund II, L.P. 36-389-8753 - -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) / / (SEE INSTRUCTIONS) (b) /X/ - -------------------------------------------------------------------------------- 3 SEC USE ONLY - -------------------------------------------------------------------------------- 4 SOURCE OF FUNDS (SEE INSTRUCTIONS) WC - -------------------------------------------------------------------------------- 5 CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED / / PURSUANT TO ITEMS 2(D) OR 2(E) - -------------------------------------------------------------------------------- 6 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware - -------------------------------------------------------------------------------- 7 SOLE VOTING POWER 17,087,816* NUMBER OF ------------------------------------------------------------- SHARES 8 SHARED VOTING POWER BENEFICIALLY 0 OWNED BY EACH ------------------------------------------------------------- REPORTING 9 SOLE DISPOSITIVE POWER PERSON WITH 17,087,816* ------------------------------------------------------------- 10 SHARED DISPOSITIVE POWER 0 - -------------------------------------------------------------------------------- 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 17,087,816* - -------------------------------------------------------------------------------- 12 CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES / / CERTAIN SHARES (SEE INSTRUCTIONS) - -------------------------------------------------------------------------------- 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 19.2% - -------------------------------------------------------------------------------- 14 TYPE OF REPORTING PERSON (SEE INSTRUCTIONS) PN - -------------------------------------------------------------------------------- *SEE ITEM 5 HEREOF. SCHEDULE 13D - ---------------------- ---------------------------- CUSIP NO. 746228 10 5 PAGE 3 OF 13 PAGES - ---------------------- ---------------------------- - -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSONS. I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY) Environmental Venture Fund Limited Partnership 93-096-1333 - -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) / / (SEE INSTRUCTIONS) (b) /X/ - -------------------------------------------------------------------------------- 3 SEC USE ONLY - -------------------------------------------------------------------------------- 4 SOURCE OF FUNDS (SEE INSTRUCTIONS) WC - -------------------------------------------------------------------------------- 5 CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED / / PURSUANT TO ITEMS 2(D) OR 2(E) - -------------------------------------------------------------------------------- 6 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware - -------------------------------------------------------------------------------- 7 SOLE VOTING POWER 6,291,375* NUMBER OF ------------------------------------------------------------- SHARES 8 SHARED VOTING POWER BENEFICIALLY 0 OWNED BY EACH ------------------------------------------------------------- REPORTING 9 SOLE DISPOSITIVE POWER PERSON WITH 6,291,375* ------------------------------------------------------------- 10 SHARED DISPOSITIVE POWER 0 - -------------------------------------------------------------------------------- 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 6,291,375* - -------------------------------------------------------------------------------- 12 CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES / / CERTAIN SHARES (SEE INSTRUCTIONS) - -------------------------------------------------------------------------------- 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 7.8% - -------------------------------------------------------------------------------- 14 TYPE OF REPORTING PERSON (SEE INSTRUCTIONS) PN - -------------------------------------------------------------------------------- *SEE ITEM 5 HEREOF. SCHEDULE 13D - ---------------------- ---------------------------- CUSIP NO. 746228 10 5 PAGE 4 OF 13 PAGES - ---------------------- ---------------------------- - -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSONS. I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY) The Productivity Fund II, L.P. 36-377-5406 - -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) / / (SEE INSTRUCTIONS) (b) /X/ - -------------------------------------------------------------------------------- 3 SEC USE ONLY - -------------------------------------------------------------------------------- 4 SOURCE OF FUNDS (SEE INSTRUCTIONS) WC - -------------------------------------------------------------------------------- 5 CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED / / PURSUANT TO ITEMS 2(D) OR 2(E) - -------------------------------------------------------------------------------- 6 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware - -------------------------------------------------------------------------------- 7 SOLE VOTING POWER 4,789,484* NUMBER OF ------------------------------------------------------------- SHARES 8 SHARED VOTING POWER BENEFICIALLY 0 OWNED BY EACH ------------------------------------------------------------- REPORTING 9 SOLE DISPOSITIVE POWER PERSON WITH 4,789,484* ------------------------------------------------------------- 10 SHARED DISPOSITIVE POWER 0 - -------------------------------------------------------------------------------- 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 4,789,484* - -------------------------------------------------------------------------------- 12 CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES / / CERTAIN SHARES (SEE INSTRUCTIONS) - -------------------------------------------------------------------------------- 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 6.0% - -------------------------------------------------------------------------------- 14 TYPE OF REPORTING PERSON (SEE INSTRUCTIONS) PN - -------------------------------------------------------------------------------- *SEE ITEM 5 HEREOF. SCHEDULE 13D - ---------------------- ---------------------------- CUSIP NO. 746228 10 5 PAGE 5 OF 13 PAGES - ---------------------- ---------------------------- - -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSONS. I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY) Environmental Private Equity Fund II, L.P. 36-383-0765 - -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) / / (SEE INSTRUCTIONS) (b) /X/ - -------------------------------------------------------------------------------- 3 SEC USE ONLY - -------------------------------------------------------------------------------- 4 SOURCE OF FUNDS (SEE INSTRUCTIONS) WC - -------------------------------------------------------------------------------- 5 CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED / / PURSUANT TO ITEMS 2(D) OR 2(E) - -------------------------------------------------------------------------------- 6 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware - -------------------------------------------------------------------------------- 7 SOLE VOTING POWER 7,121,462* NUMBER OF ------------------------------------------------------------- SHARES 8 SHARED VOTING POWER BENEFICIALLY 0 OWNED BY EACH ------------------------------------------------------------- REPORTING 9 SOLE DISPOSITIVE POWER PERSON WITH 7,121,462* ------------------------------------------------------------- 10 SHARED DISPOSITIVE POWER 0 - -------------------------------------------------------------------------------- 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 7,121,462* - -------------------------------------------------------------------------------- 12 CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES / / CERTAIN SHARES (SEE INSTRUCTIONS) - -------------------------------------------------------------------------------- 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 8.7% - -------------------------------------------------------------------------------- 14 TYPE OF REPORTING PERSON (SEE INSTRUCTIONS) PN - -------------------------------------------------------------------------------- *SEE ITEM 5 HEREOF. Page 6 of 13 Pages THIS SCHEDULE AMENDS A SCHEDULE 13D DATED AUGUST 12, 1992, AS AMENDED BY AMENDMENT NO. 1 DATED MAY 25, 1994, AMENDMENT NO. 2 DATED JULY 29, 1997 AND AMENDMENT NO. 3 DATED AUGUST 3, 1998 (AS AMENDED, THE "ORIGINAL 13D"). ALL ITEMS NOT MENTIONED SPECIFICALLY IN THIS AMENDMENT REMAIN AS PROVIDED IN THE ORIGINAL 13D. Item 1. Security and Issuer. This Schedule 13D is filed with respect to shares of Common Stock ("Common Stock") of Pure Cycle Corporation, a Delaware corporation (the "Company"). The Company's principal executive offices are located at 8451 Thornton Street, Thornton, Colorado 80260. Item 2. Identity and Background. This Schedule 13D is filed on behalf of Apex Investment Fund II, L.P., a Delaware limited partnership ("Apex"), Environmental Venture Fund Limited Partnership, a Delaware limited partnership ("EVF"), The Productivity Fund II, L.P., a Delaware limited partnership ("PF II"), and Environmental Private Equity Fund II, L.P., a Delaware limited partnership ("EPEF"). (Apex, EVF, PF II and EPEF will be referred to collectively as the "Filing Parties"). Apex maintains its principal office at 225 W. Washington, Suite 1450, Chicago, Illinois 60606 (the "Apex Address"). EVF, PF II and EPEF maintain their principal office at 233 South Wacker Drive, 9500 Sears Tower, Chicago, Illinois 60606 ("Suite 9500"). The principal business of each of the Filing Parties is venture capital and private equity investment. Each of the Filing Parties is controlled through one or more partnerships. In this Schedule 13D, the persons who have or share control of a Filing Party after looking through one or more intermediate partnerships will be referred to as "ultimate general partners." The ultimate general partners of Apex are: First Analysis Corporation, a Delaware corporation ("FAC"), Stellar Investment Co. ("Stellar"), a corporation controlled by James A. Johnson ("Johnson"); George Middlemas ("Middlemas"); and Chartwell Holdings, Inc. ("Chartwell"), a corporation controlled by Paul J. Renze ("Renze"). The ultimate general partners of EVF are: FAC; Felsen, Genack Associates ("FGA"); William D. Ruckelshaus Associates, a Limited Partnership ("WDRA"); and RS Investment Management ("RSIM"). The ultimate general partners of PF II are FAC and Bret R. Maxwell ("Maxwell"). The ultimate general partners of EPEF are FAC, Maxwell, RSIM, Argentum Environmental Corporation ("AEC") and Schneur Z. Genack, Inc. ("SZG"). (a), (b) and (c). The following information is furnished with respect to each person who takes executive actions on behalf of FAC with respect to its functioning as an ultimate general Page 7 of 13 Pages partner of the Filing Parties, and on behalf of Maxwell personally, each of whom maintains Suite 9500 as his principal business address: NAME AFFILIATION WITH FAC ---- -------------------- F. Oliver Nicklin President, Chief Executive Officer and Director Bret R. Maxwell Vice Chairman Each of the above is principally employed as an executive of FAC. FAC's principal business is participation in venture capital partnerships and the provision of research investment services. Its principal business address is Suite 9500. (a), (b) and (c) (con't). Each of Johnson and Middlemas is principally employed as an executive of Apex and maintains his business address at the Apex Address. Renze is principally employed as an independent investor and maintains his business address at 5 Three Lakes Road, Barrington Hills, Illinois 60010 (the "Barrington office"). Stellar's principal business is serving as an ultimate general partner of investment partnerships. Its business address is maintained at the Apex Address. Chartwell's principal business is serving as an ultimate general partner of investment partnerships. Its business address is maintained at the Barrington office. (a), (b) and (c) (con't). Each of AEC and SZG maintains its business address c/o The Argentum Group ("TAG"), 405 Lexington Avenue, 54th Floor, New York, New York 10174 (the "TAG Address"). The persons who take actions on behalf of FGA with respect to its functioning as an ultimate general partner of EVF are Harvey G. Felsen ("Felsen") and Schneur Z. Genack ("Genack"). The persons who take actions on behalf of AEC and SZG with respect to their functioning as ultimate general partners of EPEF are Genack, Daniel Raynor ("Raynor") and Walter H. Barandiaran ("Barandiaran"). Each of Raynor and Barandiaran is principally employed as an executive of TAG and maintains his business address at the TAG address. TAG's principal business is merchant banking. Felsen is principally self-employed as a private investor. Genack is principally employed as a private investor. His business address and the business address of FGA is 18 East 48th Street, Suite 1800, New York, New York, 10017. (a), (b) and (c) (con't). WDRA maintains its business address at 1201 Third Avenue, 39th Floor, Seattle, Washington 98101. The person who takes action on behalf of WDRA with respect to its functioning as an ultimate general partner of EVF is Paul B. Goodrich ("Goodrich"). Goodrich is principally employed as a principal and officer of WDRA and maintains his business address at WDRA's offices. WDRA's principal business is venture capital investment. (a), (b) and (c) (con't). RSIM maintains its business address at 388 Market Street, Suite 200, San Francisco, California 94111. The person who takes actions on behalf of RSIM with respect to its functioning as an ultimate general partner of EVF and EPEF is Charles R. Hamilton ("Hamilton"), who is principally employed as an executive of FAC. Hamilton maintains his principal business address at 6065 Shelter Bay Avenue, Mill Valley, California 94941. Hamilton Page 8 of 13 Pages does not take executive action on behalf of FAC with respect to its functioning as an ultimate general partner of the Filing Parties. RSIM's principal business is investment banking. (d) and (e) None of the Filing Parties and, to the best of each Filing Party's knowledge, none of the persons listed in the responses to Items 2(a), (b) or (c) above has, during the last five years, been (i) convicted in a criminal proceeding (excluding traffic violations or similar misdemeanors) or (ii) a party to a civil proceeding of a judicial or administrative body of competent jurisdiction and as a result of such civil proceeding was or is subject to a judgment, decree or final order enjoining future violations of or prohibiting activities subject to, federal or state securities laws or finding any violation of such laws. (f) To the best of each Filing Party's knowledge, each of the natural persons listed in the responses to Items 2(a), (b) or (c) above is a citizen of the United States, except for Barandiaran who is a citizen of Peru. Item 3. Source and Amount of Funds or Other Consideration. All of the funds invested (or to be invested) by the Filing Parties in the Company were obtained (or are expected to be obtained) from capital contributions made by their respective partners. Item 4. Purpose of Transaction. The securities of the Company held by the Filing Parties were purchased as an investment. One or more of the Filing Parties may, in the future, purchase additional securities of the Company or dispose of securities of the Company. None of the Filing Parties has any present plans or proposals that relate to or would result in transactions of the kind described in paragraphs (a) through (j) of Item 4 of Rule 13D-101 promulgated under the Securities Exchange Act of 1934, as amended (the "1934 Act"). In the future, however, each of the Filing Parties reserves the right to adopt such plans or proposals, subject to applicable regulatory requirements, if any. Item 5. Interest in Securities of the Issuer. (a) (i) As of the date of this amended Schedule, each of the Filing Parties owns the number of shares of Common Stock, the Company's Series A-1 Preferred Stock (the "Series A-1 Preferred") and warrants to purchase the number of shares of Common Stock described below: Page 9 of 13 Pages
Series A-1 Filing Party Common Stock Warrants Preferred* Percentage of Class** ------------ ------------ -------- ---------- --------------------- Apex 6,314,951 8,506,198 408,000 19.2% EVF 3,681,561 3,609,814 0 7.8% PF II 3,005,680 1,783,804 0 6.0% EPEF 3,486,697 301,432 600,000 8.7%
*Each share of Series A-1 Preferred is convertible into shares of the Common Stock at any time by action of the holder and under certain circumstances. The 408,000 shares of Series A-1 Preferred owned by Apex are convertible into 2,266,667 shares of Common Stock and the 600,000 shares of Series A-1 Preferred owned by EPEF are convertible into 3,333,333 shares of Common Stock. ** All percentages are computed assuming the exercise of all warrants and the conversion into Common Stock of all Series A-1 Preferred held by the particular Filing Party but no exercise of warrants or conversion into Common Stock of Series A-1 Preferred by any other Filing Party or any other person. In addition, Middlemas owns 333,333 shares of Common Stock and holds options to purchase 1,000,000 shares of Common Stock. (ii) By reason of its status as a general partner or ultimate general partner of each of the Filing Parties, FAC may be deemed to be the indirect beneficial owner of 35,290,137 shares of Common Stock, or 36.4% of such shares. By reason of his status as the majority stockholder of FAC, F. Oliver Nicklin may also be deemed to be the indirect beneficial owner of such shares. By reason of their status as ultimate general partners of Apex, Stellar (and through Stellar, Johnson), Middlemas and Chartwell (and through Chartwell, Renze) may be deemed to be the indirect beneficial owner of 17,087,816 shares of Common Stock, or 19.2% of such shares. When these shares are combined with his personal holdings of 333,333 shares and his option to purchase 1,000,000 shares of Common Stock described above, Middlemas may be deemed to be the beneficial owner (directly with respect to the option shares and indirectly as to the balance) of 18,421,149 shares of Common Stock, or 20.5% of such shares. By reason of his status as an ultimate general partner of PF II and EPEF, Maxwell may be deemed to be the indirect beneficial owner of 11,910,946 shares of Common Stock, or 14.2% of such shares. By reason of FGA's and WDRA's status as general partners of EVF, FGA, WDRA and their respective controlling persons may be deemed to be the indirect beneficial owners of 6,291,375 Page 10 of 13 Pages shares of Common Stock, or 7.8% of such shares. By reason of AEC's and SZG's status as ultimate general partners of EPEF, AEC, SZG and their controlling persons may be deemed to be the indirect beneficial owners of 7,121,462 shares of Common Stock, or 8.7% of such shares. By reason of Genack's interest in FGA, AEC and SZG, he may be deemed to be the indirect beneficial owner of 13,412,837 shares of Common Stock, or 15.9% of such shares. By reason of RSIM's status as a general partner of EVF and an ultimate general partner of EPEF, RSIM and its controlling persons may be deemed to be the indirect beneficial owners of 13,412,837 shares of Common Stock, or 15.9% of such shares. (iii) Each of the Filing Parties disclaims beneficial ownership of all shares of Common Stock described herein except those shares that are owned by the Filing Party directly. The Filing Parties understand that each of the other persons named as an officer, director, partner or other affiliate of any Filing Party herein disclaims beneficial ownership of all of the shares of Common Stock described herein, except for Middlemas with respect to 333,333 shares of Common Stock owned by him and the option to purchase 1,000,000 shares held by him. Each of the Filing Parties disclaims the existence of a "group" among any or all of them and further disclaims the existence of a "group" among any or all of them and any or all of the other persons named as an officer, director, partner or other affiliate of any Filing Party, in each case within the meaning of Section 13(d)(3) of the 1934 Act. (b) (i) Apex has the sole power to dispose of and the sole power to vote 6,314,951 shares of Common Stock. In addition, Apex has the sole power to dispose of 8,506,198 shares of Common Stock that are the subject of the warrants to purchase 8,506,198 shares of Common Stock held by Apex (the "Apex Warrants") and 408,000 shares of Series A-1 Preferred. FAC, Stellar, Johnson, Middlemas, Chartwell and Renze may be deemed to share the power to direct the disposition or vote of the 6,314,951 shares owned directly by Apex, the 8,506,198 shares that are the subject of the Apex Warrants and the 408,000 shares of Series A-1 Preferred. (ii) EVF has the sole power to dispose of and to vote 3,681,561 shares of Common Stock. In addition, EVF has the sole power to dispose of 2,609,814 shares of Common Stock that are the subject of the warrants to purchase 2,609,814 shares of Common Stock held by EVF (the "EVF Warrants"). FAC, FGA, WDRA and RSIM may be deemed to share the power to direct the disposition or vote of both the 3,681,561 shares owned directly by EVF and the 2,609,814 shares of Common Stock that are the subject of the EVF Warrants. (iii) PF II has the sole power to dispose of and to vote 3,005,680 shares of Common Stock. In addition, PF II has the sole power to dispose of the 1,783,804 shares that are the subject of the warrants to purchase 1,783,804 shares of Common Stock held by PF II (the "PF II Warrants"). FAC and Maxwell may be deemed to share the power to direct the disposition or vote of both the 3,005,680 shares owned directly by PF II and the 1,783,804 shares of Common Stock that are the subject of the PF II Warrants. Page 11 of 13 Pages (iv) EPEF has the sole power to dispose of and to vote 3,486,697 shares of Common Stock and 600,000 shares of Series A-1 Preferred. In addition, EPEF has the sole power to dispose of the 301,432 shares that are the subject of the warrants to purchase 301,432 shares of Common Stock held by EPEF (the "EPEF Warrants"). FAC, Maxwell, RSIM, AEC and SZG may be deemed to share the power to direct the disposition or vote of both the 3,486,697 shares of Common Stock and the 600,000 shares of Series A-1 Preferred owned directly by EPEF and the 301,432 shares of Common Stock that are the subject of the EPEF Warrants. (v) Middlemas has the sole power to dispose of and to vote 333,333 shares of Common Stock. In addition, subject to the exercise of his option, Middlemas has the sole power to vote and dispose of the 1,000,000 shares of Common Stock that are the subject of his option. (c) No transactions in Common Stock were effected during the past sixty days by any of the Filing Parties. (d) None. (e) Not applicable. Page 12 of 13 Pages After reasonable inquiry and to the best of the undersigned's knowledge and belief, the undersigned certify that the information set forth in this statement is true, complete and correct. Dated: April 16, 2001 APEX INVESTMENT FUND II, L.P., a Delaware limited partnership By: Apex Management Partnership, General Partner of Apex Investment Fund II, L.P. By: First Analysis Corporation, General Partner of Apex Management Partnership By: /s/ Bret R. Maxwell ----------------------------------------- Bret R. Maxwell, Vice Chairman ENVIRONMENTAL PRIVATE EQUITY FUND II, L.P., a Delaware limited partnership By: Environmental Private Equity Management II, L.P., General Partner of Environmental Private Equity Fund II, L.P. By: First Analysis EPEF Management Company II, General Partner of Environmental Private Equity Management II, L.P. By: First Analysis Corporation, General Partner of First Analysis EPEF Management Company II By: /S/ BRET R. MAXWELL ----------------------------------------- Bret R. Maxwell, Vice Chairman Page 13 of 13 Pages THE PRODUCTIVITY FUND II, L.P., a Delaware limited partnership By: First Analysis Management Company II, General Partner of The Productivity Fund II, L.P. By: First Analysis Corporation, General Partner of First Analysis Management Company II By: /s/ Bret R. Maxwell ----------------------------------------- Bret R. Maxwell, Vice Chairman THE ENVIRONMENTAL VENTURE FUND, L.P., a Delaware limited partnership By: Environmental Venture Management, L.P., General Partner of The Environmental Venture Fund, L.P. By: First Analysis Corporation, General Partner of Environmental Venture Management, L.P. By: /s/ Bret R. Maxwell ----------------------------------------- Bret R. Maxwell, Vice Chairman