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b.� `...r <br /> Supplemental Preliminary Site Investigation for State Route 99/Hammer Lane Project No. H2O2 <br /> to Mark Thomas & Co., Inc. November 17, 1999 <br /> 59 feet. The soil cuttings were screened for hydrocarbons using a PID. The PID detected the <br /> presence of hydrocarbons in the cuttings of borings EGC-1 and EGC-2 at levels of 3 to 13 ppm <br /> (samples were obtained at 15 and 21.5 feet in EGC-1 and 11 and 21 feet in EGC-2. A petroleum odor <br /> was not detected in cuttings from these borings. The PID detected the presence of hydrocarbons in <br /> the cuttings of boring EGC-3 at levels ranging between 15 to greater than 1,000 ppm from 6 to 26 feet. <br /> A petroleum odor was detected in the cuttings where the PID readings were greater than 1,000 ppm <br /> (16 to 21 feet). - <br /> Laboratory Analysis <br /> Laboratory analysis for determination of the presence of benzene, toluene, ethylbenzene, total xylene, <br /> total purgeable hydrocarbons (TPH) as gasoline and TPH as diesel (EPA test methods 8015m and <br /> 8020) indicated that soil samples acquired from boring EGC-3 contained some or most of these <br /> constituents above the detection limit(samples acquired from 16 to 21.5 feet had the highest detection <br /> readings). Laboratory analysis for soil samples acquired in borings EGC-1 and EGC-2 (EPA test <br /> methods 8015m and 8020) did not report results at or above the detection limit. The ground water <br /> sample acquired from boring EGC-2, which was analyzed in the laboratory, indicated the presence of <br /> unidentified diesel hydrocarbons in the C 10 - C24 range at 0.173 mg/l. The results of the analytical <br /> laboratory analysis are included in Appendix II. A summary of the laboratory results are presented <br /> on Table 1, below: <br /> TABLE 1 <br /> AUTO FACTORY SITE (FORMER TEXACO STATION) <br /> Matrix: Soil; Units: mg/kg <br /> Client Sample I.D. EGC-1-3 EGC-14 EGC-2-3 EGC-2-4 <br /> Depth (Feet) 15.0 - 15.5 21.0 - 21.5 21.0 - 21.5 31.0 - 31.5 <br /> ANALYTE R/L* Results R/L* Results R/L* Results R/L* Results <br /> Benzene 0.005 ND** 0.005 ND** 0.005 ND** 0.005 ND** <br /> Toluene 0.005 ND** 0.005 ND** 0.005 ND** 0.005 ND** <br /> Ethylbenzene 0.005 ND** 0.005 ND** 0.005 ND** 0.005 ND** <br /> Total Xylenes 0.005 ND** 0.005 ND** 0.005 ND** 0.005 ND** <br /> TPH as Gasoline 1.0 ND** 1.0 ND** 1.0 ND** 1.0 ND** <br /> TPH as Diesel 1.0 ND** 1.0 ND** 1.0 1 ND** 1.0 ND** <br /> * R/L = Reporting Limit <br /> ** ND = Not detected. Compound(s) may be present at concentrations below the reporting limit. <br /> 3 <br /> V ESfANA GEOTECHNICAL CONSULTING <br />