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1 19 June 2003 <br /> AGE-NC Project No 99-0657 <br /> Page 2 of 4 <br />' chain-of-custody to Cal Tech Environmental Laboratories (CTEL), a California Department of <br /> Health Services-certified analytical laboratory, for analysis 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 (BTE&X) and the fuel additives di- <br /> isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), methyl tertiary-butyl ether <br /> (MTBE), tertiary-amyl methyl ether (TAME), tertiary butyl alcohol (TBA), <br /> 1,2-dlchloroethane (1,2-DCA) and 1,2-dlbromoethane (EDB) 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 /> 07 April 2003 The contaminant Impact to ground water was quantified from the laboratory <br />�. analytical data <br /> 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> At the time of the April 2003 sampling event, depths to ground water ranged from 34 27 feet to <br /> 36 67 feet below the tops of the well casings Ground water elevations at the site ranged from <br /> 5 48 feet above mean sea level(MSL)in well MW6 to 6 31 feet above MSL In well MW7 (Table 1) <br /> During this monitoring event, the ground water levels in the wells were at least four feet below the <br /> tops of the well screens, Indicating that the wells are screened properly to yield representative <br /> shallow ground water samples <br /> Ground water flow was Inferred to be flowing towards the southwest with an average hydraulic <br /> gradient of 0 006 feet/feet Figure 3 Illustrates the contoured ground water elevations as measured <br /> on 07 April 2003 <br /> 32 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH- was detected In the water samples collected from wells MW 1 through MW6 at a maximum <br /> g p g <br /> concentration of 3,600 micrograms per liter (µg/1) in sample MW 1 TPH-d was not detected at or <br /> above laboratory detection limits in the ground water samples collected this quarter <br /> Advanced GcoEnvironmentai,Inc <br />