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26485 THORNTON ROAD <br /> WKA No 2556 02 <br /> I August 18, 1994 <br /> Page 3 <br /> Based on analysis of samples obtained during removal of the USTs, a workplan was prepared by <br /> our firm October 21, 1993, to investigate the extent of soil and ground water contamination in <br /> Ithe vicinity of the former gasoline USTs and observe the excavation and removal of the <br /> accessible contaminated soil. <br /> SOIL EXCAVATION <br /> In accordance with the workplan, excavation of the gasoline contaminated soil was undertaken on <br /> INovember 19, 1993 by Aronson Engineering Approximately 150 cubic yards of contaminated <br /> soil were removed from beneath the former USTs and dispenser island during this phase of work <br /> Additionally, two intersecting trenches were excavated in an effort to evaluate the lateral extent <br /> of soil contamination Six soil samples were obtained from the bottom and side walls of the <br /> trenches and analyzed by a California-certified laboratory for Total Petroleum Hydrocarbons <br /> using EPA method 8015 Modified and Benzene, Toluene, Ethylbenzene, and Xylene (BTE) ) <br /> using EPA Method 8020 The samples were obtained at the locations indicated on Plate 2 <br /> I <br /> Laboratory analysis of the soil samples obtained from the exploratory trenches revealed that <br /> Isample EX6-7, obtained from the north wall of the former UST excavation, contained a TPH <br /> gasoline concentration of 28 mg/kg Analysis of all other excavation samples revealed no <br /> Idetectable concentrations of TPH or BTEX Laboratory results for the excavation soil samples <br /> are presented in Table 1, complete laboratory reports and chain-of-custody documentation are <br /> appended <br /> I Based on filed observations and analytical results of samples obtained during exploratory <br /> trenching, the extent of contamination is estimated to encompass and area of approximately 1000 <br /> square feet (Plate 2) and extend from approximately 5 feet below surface grade to the soil/ground <br /> water interface <br /> V0% <br /> WALLACE•KUHL <br /> Recycled paper &ASSOCIATES INC <br />