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Ile 25 August 2004 <br /> AGE-NC Project No 95-0167 <br /> Page 2 of 4 <br /> ' Laboratories (CTEL), a State of California Department of Health Services (DHS)-certified <br /> laboratory, and were analyzed for <br /> ' 6 Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Method 8015 Modified, <br /> t0 Benzene, toluene, ethylbenzene and total xylenes (BTEX) and the fuel additives methyl- <br /> tertiary butyl ether (MTBE), di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), <br /> tertiary-amyl methyl ether(TAME),tertiarybutyl alcohol(TBA), 1,2-dibromoethane(EDB) <br /> and 1,2-dichloroethane (1,2-DCA) in accordance with EPA Method 8260B <br /> ' 3.0. FINDINGS <br /> Ground water flow direction, elevation, and gradient were determined from data collected in the <br /> ' field The hydrocarbon impact to ground water was quantified by the laboratory data obtained from <br /> the ground water samples <br /> Ile <br /> 3 1 GROUND WATER ELEVATION AND GRADIENT <br /> For the June 2004 sampling event,depths to ground water ranged from 15 43 feet to 16 25 feet below <br /> the tops of the well casings Ground water elevations at the site averaged approximately 6 7 feet <br /> ' below mean sea level (MSL) an average elevation decrease of 1 01 feet since the last monitoring <br /> event Ground water was within the screened interval of each well thus producing an accurate <br /> sampling of the first encountered ground water <br /> The ground water flow direction was determined by plotting and contouring the ground water <br /> elevation data The shape of the water table at the time of the June 2004 monitoring event was in the <br />' form of a west-northwest-plunging trough Net flow of ground water at the site was determined to <br /> be to the northwest under an average gradient of approximately 0 01 feet/feet Figure 3 illustrates the <br /> contoured ground water elevations as measured in June 2004 <br /> 32 LABORATORY RESULTS OF GROUND WATER SAMPLES <br />' TPH- was detected in the water samples collected from monitoring well MW-1 at a concentration <br /> g p g <br />' of 20,000 micrograms per liter (µg/1) <br />' Advanced GcoEnvironmental,Inc <br /> 1 <br />