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' 18 April 2000 <br /> . AGE-NC Project No 98-0534 <br />' Page 8 of 9 <br /> r <br />' 4 3 HYDROCARBON-IMPACTED GROUND WATER <br /> A total of ten `grab' water samples were collected on the site Each sample was analyzed for TPH-g, <br /> TPH-d and BTEX, with analysis for MTBE, and each sample was analyzed for the suite of five fuel <br /> additives <br /> • TPH-g was detected in seven of the ten `grab' ground water samples collected from the site <br /> at concentrations ranging from 74 ,ug/l (PI) to 11,000 ,ugll (P3) TPH-d was detected in all <br /> of the grab ground water samples analyzed at concentrations ranging from 450 µg11 to 4,600 <br /> µg11 <br /> • Benzene was detected in two of the water samples analyzed at concentrations as high as 3 1 <br /> µg/l in sample P8-water Toluene was detected in seven of the water samples analyzed at <br /> concentrations up to 16 1,tg11 in sample P7-water Other BTEX compounds were also detected <br /> at concentrations as high as 1,100 ,ug/l (xylenes in P3-water) <br /> • MTBE was detected in six of the water samples analyzed at concentrations ranging from 6 3 <br /> ,ug/1 in sample P8-water to 1,200 µgll in sample P9-water <br /> MTBE, ETBE and TBA were detected by EPA Method 8260 Modified in nine of the water <br /> samples analyzed at a maximum concentration of 1,600 µgll in sample P9-water(MTBE) <br /> Analytical results of grab ground water samples analyzed are summarized in Tables 5 and 6 The <br /> laboratory reports (MAI Laboratory ID 24717 to 24722 and 24960 to 24963), quality assurance and <br /> quality control (QA/QC) reports and chain-of-custody forms are included in Appendix C <br /> Figure 4 depicts an approximate areal distribution of impacted ground water containing TPH-g, <br /> TPH-d, MTBE and BTEX compounds, detected during the investigation <br /> 5.0. SUMMARY AND CONCLUSIONS <br /> The following conclusions were drawn from the results of this investigation <br /> Ground water at the site was first encountered at approximately 30 feet bsg <br /> • The hydrocarbon-impacted soil at the site occurred in the area of the former USTs Soil <br /> contaminated with petroleum-hydrocarbons is apparently limited to depths of approximately <br /> 15 feet bsg,except for fuel additives The highest hydrocarbon concentrations in soil samples <br /> were encountered at depths of 10 to 15 feet bsg <br /> t� <br /> Advanced CeoEnVlronmental,Inc <br />