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f , <br /> g <br /> parts per million (ppm) and TPH as <br /> l36 <br /> Ground water was encountered beneath the sitepatobetweenm. <br /> 11 and 12 feet below grade. <br /> In February 1969, additional soil samples <br /> backhoe from 12 test holes at depths Of ande10 feettbeloby <br /> w <br /> grade. Analyses of soil samples showed detectable <br /> concentrations of TPH as diesel of up to 3, 600 ppm and TPH as <br /> gasoline of up to 170 ppm. Results ative work <br /> e <br /> revealed the presence of diesel fuel contamination of the investigative <br /> the subsurface soil extending to a depth of 10 f <br /> and encompassing an area of apprbelow grade <br /> oximately 1feet feet <br /> square feet. <br /> Analytical data suggests that gasoline-range contamination is <br /> limited to the northern portion of the site. Figure 3 shows <br /> the locations of the soil borings and test holes with the <br /> investigative tasks, <br /> corresponding TPH concentrations detected. Based On these <br /> the approximate areal extent of <br /> contamination was estimated as shown in Figure 4 . soil <br /> .; SCOPE OF PROPOSED WORK <br /> The proposed subsurface investigation study will be conducted <br /> in accordance with applicable regulations and guidelines of <br /> the San Joaquin County Public Health Services-Environmental <br /> Health Division (SJC/P <br /> Water HS/EHD) and the Central Valle <br /> Quality Control Board (RWQCB) . To further definegtheal <br /> extent and nature of subsurface <br /> contamination <br /> the proposed scope of work includes the followiangthe tasks: <br /> ... Task A: R vi w f Av '1 Z <br /> �sary rmi of rm i n n A i i i n f <br /> Collect and review available information and reports <br /> relating to the site, as well as <br /> past Or ongoing <br /> subsurface investigations at nearby sites. Prior to <br /> commencing with the supplemental investigation, all <br /> required permits will be obtained and field <br /> activities will be coordinated with the appropriate <br /> agencies. This will include locating underground <br /> utilities and interferences that may be encountered <br /> during drilling <br /> or other field....activities. <br /> Task B: Droll Ex l r r it B rin <br /> n <br /> To further investigate/delineate the extent of soil . <br /> contamination, soil samples will be collected by <br /> 2 <br />