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O.g-S. - Mataga olds/Buick <br /> June 16, 1993 <br /> +r Page -7- <br /> TABLE 4 <br /> Stockpile Sam le Analyses <br /> t } <br /> Analyte As Ba Cd/ Cr Cu Pb Hg N1 Zn <br /> 145Q-SP-1-4 4 . 3 80 N 1 11 9 . 0 1 ND ND I ND 25 <br /> 145Q-SP-5-8 6. 0 80 N 11 9 .0 ND ND ND 24 <br /> oncen ra ens presenr-ec in mgjKg or parts <br /> Metals Method• <br /> As = arsenic 7060 Cu - copper 7210 <br /> Ha t barium 7080 Pb - lead 7420 <br /> Cd a cadmium 7130 Bg - mercury 7470 <br /> Cr R chromium 7190 Ni = nickel 7520 <br /> Cc cobalt 7200 Zn = zinc 7950 <br /> ND none detected at or above laboratory detection limit. /�4if, <br /> 5.0 SUMMARY AND RECOMMENDATIONS <br /> f,.. Laboratory analyses of the soil samples collected from the <br /> excavation floor and sidewalls show no evidence of TEPH or BTEX <br /> at or above laboratory detection limits . Low concentrations of <br /> chromium (ranging from 5 to 10 mg/kg) and zinc (ranging from 14 <br /> to 22 mg/kg) were detected in the excavation samples. Neither of <br /> the metals detected in the excavation samples exceed their <br /> respective total threshold limit concentration (TTLC) as defined <br /> in California State Title 22, Hazardous Waste Regulatory <br /> Criteria. <br /> The stockpile sample analyses indicate that TEPH (motor oil) <br /> was detected at 1,200 mg/kg and 190 mg/kg. Two semi volatile <br /> (BNA) constituents were detected in the stockpile samples: Di-N- <br /> A <br /> CONDOR <br /> J <br />