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' 12 February 2002 <br /> AGE-NC Project 99-0570 <br />' Page 2 of 4 <br />' custody form, stored In a chilled container and transported under chain-of-custody to McCampbell <br /> Analytical, Inc (MAI), a California Department of Health(DHS)-certified laboratory, for analysis <br />' 2 2 GROUND WATER ANALYSIS <br />' Ground water samples were analyzed for the following analytes <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) and diesel (TPH-d) In <br />' accordance with EPA Method 8015 Modified, <br /> • Benzene, toluene, ethylbenzene and total xylenes (BTEX) and methyl tertiary-butyl ether <br />' (MTBE) In accordance with EPA Method 8020, and <br /> • Oxygenated compounds - di-isopropyl. ether (DIPE), ethyl tertiary-butyl ether(ETBE), <br />' MTBE,tertiary-amyl methyl ether(TAME), tertiary butanol(TBA), ethyldlbromlde(EDB) <br /> and ethanol/methanol, 1,2-dlchloroethane(1,2-DCA)In accordance with EPA Method 8260 <br /> Modified <br />'• L <br /> 3.0. FINDINGS <br /> Ground water elevation, flow direction and gradient were determined from field data collected on <br /> 26 October 2 00 1, the contaminant Impact to ground water was assessed from the laboratory data n <br /> 3 1 GROUND WATER ELEVATION AND GRADIENT <br /> The ground water elevation on 26 October 2001 ranged from 8 6 to 10 8 feet below sea level, with <br /> an average depth to water of 14 feet below well casing grade The top of the ground water table <br /> occurred within the screened Intervals of the wells Ground water was Inferred to be flowing to the <br /> north and northeast (Figure 3) with a significant hydraulic gradient of 0 02 feet/feet toward well <br /> MW-5 <br /> 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH-g and TPH-d were detected In two of the ground water samples TPH-g was detected In <br /> Isamples MW-2 and MW-3 at concentrations of 380 micrograms per liter (µg/1) and 240 µg/l, <br /> . respecti-vely TPH-d was detected In the same samples at 450 µg/1 and 160 µg/1, respectively <br /> Advanced GeoEnviron mental,Inc <br />