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• Source area#3. This is the location of the former tar pit. Adjacent soil samples <br /> contained PNAs, TPH-diesel, and TPH-gasoline to a depth of 24 feet. This is <br /> assumed to be a pit frlled primarily with tar. <br /> • Source area#4. This is the location of a former diesel tank. Soil samples from <br /> this area contained PNAs and TPH_diesel. Groundwater from neighboring <br /> wells contains PNAs, benzene, and TPH-diesel. <br /> Other places where chemicals of potential concern were found in soil were in the vicinity of soil <br /> borings B-9,B-14,B-16,B-21, and SB-113. <br /> During previous investigations, lampblack,tar, and oily material were found in the fill material <br /> between 0 and 25 feet bgs at various locations across the site. Borings with significant amounts <br /> of lampblack, tar or oil at depths between 0 and 5 feet bgs in borings B-16, B-13, and, B-21, <br /> and occurred between depths of 5 and 20 ft bgs in borings B-15, B-17, B-14, SB-2, MW-10, <br /> MW-8, and B-11. Cyanide was found in borings B-13,B-14,B-15,MW-7, and MW-9. <br /> The following sections of this workplan present the objectives, scope,rationale, and <br /> methodologies for the supplemental soil investigation and subsequent reporting that will be <br /> completed at the PG&E Stockton site. <br /> M <br /> SF010030B7E.DOC 1-8 <br />