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Fes;> ADDENDUM TO CONTRACT FOR CONSULTING SERVICES t REGULATORY TECHNICAL ASSISTANCE, PROJECT PLANNING AND REGULATORY AGENCY NEGOTIATIONS, CONTINUED QUARTERLY GROUNDWATER MONITORING, SOIL VAPOR EXTRACTION (SAVE) SYSTEM EVALUATION AND CONTINUED SAVE SYSTEM OPERATIONS AND MANTAINANCE Canepa's Car Wash 6230 Pacific Avenue Stockton, California Prepared by: CONDOR EARTH TECHNOLOGIES, INC. CONDOR PROJECT NO. 1707 February 21, 2001 This Contract Addendum is for regulatory technical assistance (pre-approval request preparation), project planning and regulatory agency negotiation, continued quarterly groundwater monitoring, SVE system evaluation and continued SAVE system operations and maintenance at the Canepa's Car Wash located at 6230 Pacific Ave, Stockton, California (site). This Contract Addendum has been prepared by Condor Earth Technologies, Inc. (Cc:dor) at the request of Mr. Remo Canepa. San Joaquin County Public Health Services Environmental Health Division (SJC PHS/EHD) has indicated that quarterly groundwater monitoring of the eight existing site monitor wells and one of the nine existing soil vapor extraction wells (alternating) continue. The SVE system was removed from service on February 6, 2001 to meet the conditions of the Permit to Operate issued from the San Joaquin Valley Air Pollution Control District (SJVAPCD). The permit requires that the system be shutdown if destructive efficiency of the SAVE drops below 95% . Field measurements on January 24, 2001 indicated that the SAVE was operating at 68% efficiency. Despite attempts to tune the system for improved performance, additional site visits during the next two weeks indicated that the SVE was operating at 80% efficiency. The system, therefore, has been removed from service until reevaluation of its operation and efficiency can be conducted. The undersigned, in consideration of mutual promises herein, hereby agree to the following work to be performed as an Addendum to the. Contract for Consulting Services between Canepa's Car Wash and Condor, dated May 2, 1996. The work to be completed by Condor for the above referenced site will consist of the following tasks: SCOPE OF WORK TASK 1 — Regulatory Technical Assistance (Pre-Approval Request Preparation) • Condor will prepare a pre-approval request to be submitted to the-State of California Water Resources Control Board, Division of Clean Water Programs, Underground Storage Tank Cleanup Fund Program for the costs associated with Tasks 1 through 5 of this Contract Addendum.