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07 March 2003 <br /> AGE-NC Project No 98-0540 <br /> Page 2 of 4 <br /> The samples were analyzed for the following constituents <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Method 8015M, <br /> • Benzene,toluene,ethylbenzene and total xylenes(BTE&X)in accordance with EPA Method <br /> 8021B, and <br /> • BTE&X and the fuel additives methyl tertiary-butyl ether (MTBE), tertiary butyl alcohol <br /> (TBA), di-isopropyl ether (DIPE), ethyl tertiary butyl ether (ETBE), tertiary amyl methyl <br /> ether(TAME), 1,2-dibromoethane(EDB) and 1,2-dichloroethane(1,2-DCA)in accordance <br /> with EPA Method SW846 8260B <br />' Ground water samples from the on-site domestic well and the domestic well located at 25362 North <br /> Highway 99 East Frontage Road,Acampo, California were also collected and analyzed To ensure <br /> that formation water was being produced,water was allowed to run out of the well for approximately <br /> 15 minutes Ground water was poured directly Into the 40-m1 VOA vials from a faucet at the well <br /> head <br /> 3 0. FINDINGS <br /> Ground water elevation and flow direction were deducted from field data while the hydrocarboii- <br /> Iimpact to ground water was assessed 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 well was calculated by subtracting the depth to ground water <br /> from the surveyed casing elevations (Table 1) Depths to ground water ranged from 76 99 feet to <br /> 77 13 feet below the tops of the well casings Ground water elevations at the site ranged from 20 27 <br /> feet below mean sea level (MSL) in MW-2 to 20 39 feet below MSL in MW-3 The maximum <br /> ground water gradient was calculated to be 0 003 feet/feet with a southeasterly flow direction(Figure <br /> 3) <br /> 32 ANALYTICAL RESULTS OF WATER SAMPLES <br /> TPH-g was detected in the ground water samples collected from MW-1 and MW-3 at concentrations <br /> • of 390 micrograms per liter(µg/1) and 2,800 pg/l, respectively (Table 2) <br /> Advanced GeoEnvironmental,Inc <br />