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a <br /> Page 2 ; TL 686-141-00 <br /> 2 . 0 PURPOSE OF INVESTIGATION i <br /> a The purpose of .' this preliminary investigation was to <br /> evaluate the soils in the area of the underground transformer oil <br /> storage tank to determine the existence and general extent of 4 <br /> Polychlorinated Biphenyl (PCB ) contamination. <br /> 1 <br /> 5 <br /> 3 . 0 SITE DESCRIPTION <br /> The Pacific Gas & Electric Company ' s Stockton Service Center. <br /> I1 , <br /> is located at 4040 West Lane in Stockton , California . Drawing <br /> No . 1 is a site plan showing the general layout of the facility. <br /> 'r. At the time of our field investigation , a 10 , 000 gallon , <br /> single-walled steel transformer oil tank was located on the <br /> eastern edge of the facility inside the transformer storage area . <br /> M <br /> The transformer storage area was covered with baserock. A large ; <br /> number of transformers were stored throughout this area . A pump <br /> { assembly box , used to remove oil from the transformers , was <br /> located approximately .20 feet northeast of the transformer oil" <br /> storage tank . The oil removed from the transformers is pumped. <br /> 1 <br /> x <br /> } into a concrete lined sump located approximately 7 feet north of <br /> the transformer oil storage tank . The oil is then gravity fed <br /> from the concrete lined sump into the transformer oil storage <br /> 444aaa tank . The bottom of the 10 - foot diameter storage tank was <br /> I <br /> estimated in the field to be located at a depth of between 14 <br /> feet and 15 feet below surrounding ground level . <br /> f <br /> r <br /> Fresno Modesto Visalia Bakersfield <br /> I <br />