Laserfiche WebLink
20 March 2001 <br /> AGE-NC Project-No 98-0533 <br /> Page 2 of 3 <br /> a chilled container under chain of custody to McCampbell Analytical, Inc (MAI), a California <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 dxbromide (EDB) and 1,2 dichloroethane (1,2 DCA) in accordance with EPA <br />' method 8260 <br /> At the request of the PHS-EHD, a ground water sample from the on-site domestic well was also <br /> collected and analyzed,water was allowed to run out of the well for approximately 20 minutes prior <br /> to sampling to ensure that formation water was being produced <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 /> The elevation of ground water in each of the three monitoring well was calculated b subtracting the <br /> �' g Y g <br /> depth to ground water from the surveyed relative casing elevations(Table 1) Depths to ground water <br /> averaged about 70 feet bsg Ground water elevations at the site ranged from 13 13 feet(MW-2) to <br /> 13 23 feet (MW-3) below mean sea level The ground water gradient was calculated to be 0 0014 <br /> ft/ft directed towards the northeast Figure 2 illustrates the contoured ground water elevations as <br /> measured on 17 May 2001 <br /> I3 2 ANALYTICAL RESULTS OF WATER SAMPLES <br /> TPH-ag and toluene were detected only in the water sample from MW-2 and was present at <br /> concentrations of 100 4g/l and 2 8 µg11, respectively No other petroleum hydrocarbons were <br /> detected in ground water samples from the other monitoring wells and the domestic well <br /> Advanced GeoEnvironmental,Inc <br />