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Remedial Action Plan, Addendum No. 2 April 30, 1993 . Southland Site No. 20304, 455 Grant Line Rd, Tracy, CA 2 significantly increase the effective use of soil-vapor extraction technology. A soil-vapor extraction pilot test is necessary to evaluate the subsurface conditions at the site before selecting the appropriate vapor abatement technology. The pilot test will consist of connecting these individual wells to a vacuum and pulling hydrocarbon vapors from the soil. The hydrocarbon vapors will be destroyed using a standard internal combustion engine system. Before beginning the pilot test, Groundwater Technology will procure the appropriate environmental agency permits. The test will be designed to: ■ Investigate maximum extraction flow rates, radius of influence, and induced and applied vacuum values for each vapor extraction well. Investigate maximum extractable volatile organic compound (VOC) concentrations for each vapor extraction well. The tests on the individual wells will provide data necessary for effective evaluation of the applicability of soil vapor extraction as a remedial alternative and of the appropriate vapor abatement system. Attachment 2 presents a timeline for the estimated implementation of Phases I and II. After the test results are evaluated, a summary report will be submitted for SJCPHS concurrence. The report will include the pilot test results, specifications for a full-size soil-vapor extraction system design (or, if soil vapor extraction is infeasible, recommendations for an alternative soil treatment method), and an undated implementation timeline. Phase II of the remedial action plan will consist of: ■ Continued use of groundwater extraction and treatment for hydraulic control, dewatering, and VOC mass reduction. ■ Installation of a remedial system to control soil vapor off-gas generated through soil vapor extraction. A Spray Aeration Vacuum Extraction (SAVE) system has been evaluated as the treatment system for extracted water and vapor. If the soil vapor extraction test indicates that the site is suitable for soil vapor extraction and the concentrations of hydrocarbon vapors meet the specifications of the SAVE system design, we anticipate that this system will be chosen. Initially, groundwater will be treated with liquid-phase carbon and the soil vapor test off-gas will be treated with an internal combustion engine as previously noted. Because of building requirements imposed by the City of Tracy, relocation of the proposed GWES and vapor extraction system is necessary. A revised figure presenting the new proposed location for the GWES is included in Attachment 1. Groundwater Technology is prepared to begin work on this project immediately after approval by • The Southland Corporation, the County of San Joaquin, and the City of Tracy. 37678013 GROUNDWATER - ,TECHNOLOGY, INC.