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'�I- vct <br /> 07 April 1999 <br /> s AGE-NC Project No 98-0540 <br /> Page 7 of 9 <br /> Oxygenates, Luft Metals, and HVOCs TPH-g was detected in P1 samples at concentrations ranging <br /> from 7 9 to 66 mg/kg(ppm) Soil samples from P2 had detections of Lead, Chromium, Nickel, and <br /> Zinc metals at concentrations of 7 2 to 47 mg/kg(ppm) <br /> Soil boring samples from borings B 1, B2, B4,and B5 were submitted for analysis for TPH-g,BTEX <br /> and MTBE The laboratory results indicate the presence of low concentrations of petroleum <br /> I hydrocarbons in the samples Analytical results of soil samples are summarized in Table 1 The <br /> laboratory reports and chain-of-custody forms are included in Appendix C <br /> 45 RESULTS OF GROUND WATER SAMPLE ANALYSIS <br /> A total of four grab ground water samples were submitted to DTSC-certified laboratories for <br /> analysis TPH-g was detected in ground water samples collected from B1. B2, B3, and B5 at <br /> concentrations as high 6,00 p s per billion(ppb, reported as micrograms per liter) TPH-g was ; <br /> not detected in the grab ground water sample collected from B3 <br /> Utilizing EPA Method 8020, BTEX were detected in grab ground water samples collected from B 1, <br /> B2, and B5 at concentrations as high as 4,500 ppb <br />' Utilizing EPA Method A�pbn5 8260, MTBE was detected in grab samples collected from B 1 and B2 at <br /> 7concentrations oppb; espectively <br /> Groundwater monitoring well samples were submitted for laboratory analysis MW-2 and MW-3 <br /> had detections of TPH-g at concentrations of 41,000 and 37,000 ppb, respectively BTEX <br /> compounds were detected In MW-2 and MW-3 at concentrations as high as 6,200 ppb MW-2 and <br /> MW-3 had measured concentrations of tert-butanol of 47 ppb and 18 ppb, respectively <br /> Analytical results of groundwater monitoring well samples are summarized in Table No 3 The <br /> laboratory reports and chain-of-custody forms are presented in Appendix D <br /> 5 0. SUMMARY AND CONCLUSIONS <br /> Based upon data collected during the January and March 1999 soil probings, borings, and ground <br /> water monitoring, AGE concludes <br /> • Ground water was inferred to be flowing generally northeast at a calculated gradient of 0 004 <br /> ft/ft, or approximately 14 feet per mile Due to the low gradient at the site, slight variations <br /> Advanced GeoEmiron menial,Inc <br />