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F t , <br /> 1 '1 <br />' 24 January 2001 <br /> AGE-NC Project No 98-0533 <br />' Page 2 of 4 <br /> Department of Health Services(DHS)-certified analytical laboratory for analysis The samples were <br />' analyzed for <br /> • Total petroleum hydrocarbons quantified as aviation gasoline(TPH-ag) in accordance with <br />' EPA Method 5030/8015M, <br /> • Volatile aromatic hydrocarbons - benzene, toluene, ethylbenzene and xylene (BTEX) with <br />' methyl tertiary-butyl ether(MTBE) in accordance with EPA Method 8020, <br /> • Fuel oxygenates - tertiary butanol (TBA), di-isopropyl ether (DIPE), ethyl tert-butyl ether <br /> (ETBE), tert-amyl methyl ether {TAME), and MTBE in accordance with EPA Method' <br />' 8260B, and <br /> • Ethylene dibromide (EDB) and 1,2 dichlor'oethane (1,2 DCA) in accordance with EPA <br />' method 8260 <br /> 3.0. FINDINGS <br />' • Ground water elevation and flow direction were inferred from field data, hydrocarbon-impact to <br /> ground water was quantified by laboratory analysis of the ground water samples <br /> 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> I The elevation of ground water in each well was calculated by subtracting the depth to ground water <br /> from the surveyed relative casing elevations (Table 1) Depths to ground water averaged about 74 <br /> feet bsg Ground water elevations at the site ranged from 17 23 feet (MW-2) to 17 44 feet (MW-3) <br /> below mean sea level The ground water gradient was calculated to be 0 003 ft/ft directed towards <br /> the northeast Figure 3 illustrates the contoured ground water elevations as measured on 17 <br /> November 2000 <br /> 32 ANALYTICAL RESULTS OF WATER SAMPLES <br /> I TPH-a was detected only in the water sample from MW-2 at a concentration of 240 l Toluene <br /> g Y p µ� <br /> I was detected in samples taken from MW-1 (0 93 legd) and MW-2 (8 )Ag/1) No other petroleum <br /> hydrocarbons were detected , <br /> t Y <br /> Analytical results of groundwater samples are summanzed on Table 3 The laboratory report(MAI <br /> Lab I D No 54033 through 54035) and chain-of-custody forms are included in Appendix C <br /> 0 " <br /> IAdvanced GeoEnvironmental,Inc <br />