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K <br /> wells, the piezometric surface was sounded at an average depth of 14.82 feet below the tops <br /> of the well casings. <br /> Newly-surveyed, casing-top elevations Above Mean Sea Level (AMSL)were obtained from <br /> a California-licensed land surveyor. Water table elevations in the wells averaged 5.55 feet <br /> below Mean Sea Level. Using the three-point method, the site-specific, ground-water flow <br /> direction as of June 24, 1994 was calculated easterly at approximately S87°E along a <br /> gradient of approximately 0.02 foot/foot. <br /> i Detectable,primarily fractional BTEX analytes were detected only in soil samples collected <br /> from MW-6. The highest TPH-g result was 39 mg/kg, revealed in the sample collected from <br /> MW-6 at 15 feet bsg. TRPH-d results were nondetectable except for 8 mg/kg of weathered <br /> ! diesel revealed in the sample collected from MW-5 at 5 feet. <br /> =_t Ground-water samples collected from the three wells were received at Sherwood Labs on <br /> June 21, 1994. The analytical results revealed wholly nondetectable concentrations of <br /> TRPH-d analytes and nondetectable results for TPH-g and BTEX analytes in samples <br /> k:< collected from wells MW-4 and MW-5. The results of the analysis of the sample collected <br /> �= from MW-6 indicate that the ground water underlying that vicinity is significantly impacted <br /> with TPH-g and BTEX analytes well above the MCLs set by the California Department of <br /> Health Services. <br /> t `> 6.0 CONCLUSIONS <br /> �.T <br /> - Based upon previous and current subsurface and analytical data, W W. Irvin, Inc. concludes <br /> the following: <br /> g <br /> • After sampling for laboratory analyses, minor gasoline impaction of the subsurface <br /> soils and significant gasoline impaction of the ground water were discovered <br /> underlying the vicinity of northernmost monitoring well MW-6. Gasoline analytes <br /> were not detected in soil or ground-water samples collected from monitoring wells <br /> E MW-4 and MW-5. Minimal diesel impaction of 8 mg/kg was encountered only in <br /> the soil sample collected at 5 feet bsg in MW-5. <br /> • During the drilling of MW-4 through MW-6, water-saturated soils were encountered <br /> at an average depth of 18 feet bsg. Prior to purging and sampling the three wells, <br /> the piezometric surface was sounded at an average depth of 14.82 feet below the tops <br /> of the well casings. <br /> • Water table elevations in the three wells averaged 5.55 feet below Mean Sea Level. <br /> Using the three-point method, the site-specific, ground-water flow direction as of <br /> June 24, 1994 was calculated easterly at S87°E along a gradient of approximately 0.02 <br /> W.W.Irwin,Inc. <br /> Project No.33016.03 <br /> 1 July 1994 7 <br /> -fi <br />