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25 February 2004 <br /> i AGE-NC Project No 99-0657 <br /> Page 2 of 4 <br /> transported under chain-of-custody to Cal Tech Environmental Laboratories (CTEL), a California <br />' Department of Health Services-certified analytical laboratory, for analysis The samples were <br /> analyzed for <br />' Total petroleum hydrocarbons quantified as gasoline (TPH-g) and diesel (TPH-d) in <br /> accordance with EPA Method 8015 Modified, and <br />' Benzene,toluene,ethylbenzene and total xylenes(BTEX)and the fuel additives di-isopropyl <br /> ether(DIPE),ethyl tertiary-butyl ether(ETBE),methyl tertiary-butyl ether(MTBE),tertiary- <br /> amyl methyl ether(TAME),tertiarybutyl alcohol(TBA), 1,2-dichloroethane(1,2-DCA)and <br />' 1,2-dibromoethane (EDB) in accordance with EPA Method 8260B <br /> 3.0. FINDINGS <br />' Ground water elevation, flow direction, and gradient were determined from field data collected on <br /> 06 October 2003 The contaminant Impact to ground water was quantified from the laboratory <br /> lie <br /> analytical data <br /> 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br />' At the time of the October 2003 sampling event,depths to ground water ranged from 35 75 (MW-7) <br /> P g <br /> feet to 37 89 (MW-6) feet below the tops of the well casings Ground water elevation at the site <br />' averaged approximately 4 59 feet above mean sea level (MSL) which indicates a decrease In <br /> elevation of 0 10 feet above MSL since the July 2003 monitoring event (Table 1) During this <br /> monitoring event, the ground water levels in the wells were at least four feet below the tops of the <br />' well screens, Indicating that the wells are screened properly to yield representative shallow ground <br /> water samples <br />' Ground water flow was Inferred to be flowing towards the southwest with an average hydraulic <br /> gradient of 0 004 foot/foot Figure 3 illustrates the contoured ground water elevations as measured <br />' on 06 October 2003 <br />' 32 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH-g was detected in the water samples collected from wells MWA through MW-6 at <br />' concentrations ranging from 370 micrograms per liter(µg/l) (MW-5) to 4,300 µg/1 (MW-1) <br /> i <br />' Advanced GeoEnvtronmental,Inc <br />