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16 <br /> Production Operators, Inc (POI) has prepared this work plan for the K-3 and K- <br /> 4 gas compressor area of Pacific Gas and Electric's (PG&E) McDonald Island <br /> Gas Storage Facility located near Stockton, California Figure 1 shows the <br /> location of the McDonald Island Facility The purpose of the proposed work is <br /> to define the vertical extent of chemical impact to the soil and the potential for <br /> chemical impact to the ground water due to POI's operation of the K-3 and K-4 <br /> compressors <br /> ' Site Background <br /> POI operated the two compressors at the McDonald Island Facility for <br /> approximately eight years During this time, various oils, antifreeze, and <br /> solvents were used for the operation and maintenance of the compressors <br /> These materials were stored in a hazardous material storage area located in <br /> the northeastern corner of the site Figure 2 shows the location of the former <br /> gas compressors (K-3 and K-4) and the former hazardous material storage <br /> area <br /> Two previous field sampling events have occurred at the McDonald Island <br /> facility The first occurred during the removal of the gas compressors PG&E's <br /> Technical and Ecological Services (TES) collected thirteen shallow soil <br /> samples at thirteen locations around the compressor pads and in the vicinity of <br /> the hazardous storage area (TES, December 1996) In addition, two deeper <br /> soil samples (8 and 11 5 feet below surface grade (bsg)) were collected from <br /> Location #1(Figure 3) The soil samples collected were analyzed for <br /> purgeable and extractable Total Petroleum Hydrocarbons (TPH) by EPA <br /> Method 8015M, Benzene, Toluene, Ethlybenzene, Xylene (BTEX) by EPA <br /> Method 8015M, Volatile Organic Compounds (VOCs) by EPA Method 8240, <br /> and glycol by EPA Method 8015M The results of these analyses are presented <br /> to Table 1, sample locations are presented on Figure 3 (TES, December 1996) <br /> The analytical results indicated chemical impact in the areas around the former <br /> compressor pads and the hazardous material storage area <br /> Page 1 <br />