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J � y <br /> WrFH <br /> RESIDUAL SOIL CONTAMINATION <br /> Petroleum impacted soil was encountered, during the drilling of SB2, SB3, MW1, MW2 and <br /> MW3 on October 10 and 11, 1994. The data from the overexcavation done on July 7 through <br /> 12, 1993, indicate impacted soil in the northwest end of the excavation. The soil samples <br /> collected from MW 1 during its construction indicate the soil is not contaminated in the <br /> northeast end of the excavation. Soil samples from MW3 indicate the soil is not impacted to <br /> the extreme north northwest of the excavation and soil samples from MW2 indicate the soil is <br /> not impacted to the east of the excavation. <br /> Based on the concentrations of petroleum hydrocarbons in SB2 and SB3 (Table 2) and the <br /> concentrations of petroleum hydrocarbons in the confirmation samples collected on July 7 <br /> through 12, 1993 (Table 1), there appears to be approximately 130 cubic yards of impacted <br /> soil in the northwest corner of the excavation. The impacted soil is located approximately <br /> between 15 and 18 feet bgs. An approximate area of contamination is shown on Figure 5. <br /> STOCKPILED SOIL SAMPLING PLAN <br /> To characterize the stockpiled soil, Smith Environmental proposes to collect one discreet <br /> sample for every 50 cubic yards of soil, a total of 18 samples. The samples will be collected <br /> from 2 feet below the surface of the stockpile. The samples will be placed on ice and <br /> transported under chain-of-custody documentation to Argon Laboratories in Ceres, California. <br /> The samples will then be composited in the laboratory at a 2:1 ratio and analyzed for TPHd, <br /> TPHg and BTEX. The stockpiled soil will remain onsite pending laboratory analysis to <br /> determine its final disposition. <br /> If you have any questions please contact us at (209) 838-3507. <br /> Respectfully submitted, <br /> Smith Environmental Technologies Corporations <br /> -DAW 4"Ni <br /> Drew Van Allenr�70 <br /> �; <br /> Staff Scientist pp .a EYP <br /> F:fC�f�� ;A91 ...J •.: � <br /> Jeanne Homsey, P.E. <br /> Registered Engineer No. C47410 <br /> Attachments <br /> n:115010713QTR95 <br />