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i ` V 26485 THORNTON ROAD WKA No. 2213.09 June 23, 1993 Page 3 only y trace concentrations of Xylene in sample PT2. Additionally, analytical results for the sample SW 1 obtained from the sidewall of the excavation revealed a TPH-gasoline concentration of 4.1 mg/kg. Analytical results for all soil samples revealed Total Lead concentrations ranging from 6.0 mg/kg to 9.3 mg/kg and no detectable concentrations of EDB. Analytical results for Stockpile 1 composite samples STK1A-D revealed a TPH-gasoline concentration of 0.79 mglkg and Total Lead concentrations of 11 mg/kg. Analytical results for samp=1111?1112om water in the excavation, revealed TPH- gasoline concentrations of� Total Lead concentrations ranging from 10 jcglP to 31 µg1f and nof EDB. Concentrations of TPH-gasoline revealed in soil sample 72b and water sample W2, were reported by the analytical laboratory as a product not typical of gasoline. Mr. Joel Kiff, senior chemist at the laboratory, revealed that the constituents reported as "not typical gasoline" are probably the more volatile constituents of diesel. Analytical results for the soil samples are summarized in Table 1; analytical, results for the water samples are summarized in Table 2. Complete laboratorytest results and chain-of-custody documentation are attached. Conclusions & Recommendations Our `observations during tank removal and the laboratory analyses indicate-that the soils beneath the former USTs and the sidewalls of the excavation have been contaminated with petroleum hydrocarbons. Based on field observations and laboratory analysis, excavation of the remaining soil contamination may be cost effective. Additionally, we recommend that a pump truck be brought to the site to remove the obviously contaminated water from the former UST excavation; the water will be taken to an oil separating-faciiity for treatment. Following removal of the contaminated water, we recommend taking two additional samples of the water to evaluate the effectiveness of the pumping operation. These water samples, as well as any soil samples IWALLACE•KUHL Fr ASSOCIATES INC.