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I , <br /> 09 July 2002 <br /> • AGE-NC Project No 99-0637 <br />' Page 2 of 4 <br /> chain-of-custody to McCampbell Analytical Inc , a California Department of Health Services- <br /> certified laboratory The samples were analyzed for <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) in accordance with EPA Method <br /> 8021B, and <br /> • Fuel additives including methyl tertiary-butyl ether(MTBE),dl-Isopropyl ether(DIPE),ethyl <br /> tertiary-butyl ether (ETBE), tertiary-amyl methyl ether (TAME), tertiary butanol (TBA), <br /> Iethylene dibromide (EDB) and 1,2-dichloroethane (1,2-DCA) in accordance with EPA <br /> Method 8260B <br /> 3.0. FINDINGS <br /> Ground water elevation, flow direction, and gradient were determined from field data collected on <br /> . 18 May 2002, the contaminant Impact to ground water was quantified by the laboratory analytical <br />' data <br /> 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br />' At the time of the May 2002 sampling event, depths to ground water in wells MW 1 through MW7 <br /> ranged from 16 34 feet to 17 54 feet below the well heads Ground water elevations at the site ranged <br /> from 16 89 feet above mean sea level (MSL) in well MW6 to 17 01 feet above MSL In well MW7 <br /> I (Table 1) During this monitoring event,the depths to ground water in the wells were approximately <br /> 6 34 to 7 54 feet below the tops of the well screens, Indicating that the wells are screened properly <br /> to yield representative shallow ground water samples <br /> The ground water flow direction was calculated using ground water elevation data from the <br /> monitoring wells on-site The flow direction was calculated to be generally toward the <br /> west-northwest, at an average gradient of 0 001 feet/feet Figure 3 Illustrates the contoured ground <br /> water elevations as measured on 18 April 2002 <br /> I3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> ITPH-g was detected in the ground water samples collected from wells MW4 and MW5 at <br /> concentrations of 85 micrograms per liter(µg11)and 300 µg/1, respectively MTBE was detected by <br /> EPA Method 8260B In the ground water samples collected from MW1, MW2, MW4, MW5 and <br /> Advanced GeoEnviron mental,Inc <br />