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' 07 March 2003 <br /> AGE-NC Project No 00-0764 <br /> ' Page 2 of 4 <br /> 2 2 GROUND WATER SAMPLE COLLECTION <br /> After allowing the wells to achieve a minimum 80%recovery of the pre-purge water volume,ground <br /> water samples were collected from the monitoring wells using dedicated, disposable plastic bailers <br /> The water samples were transferred from the bailer into chilled 40-m1 EPA-approved volatileorganic <br /> analysis (VOA) vials containing 0 5 ml hydrochloric acid as a sample preservative and one-liter <br /> amber containers <br /> The samples were properly labeled, placed in a chilled container and transported under chain-of- <br /> custody <br /> hain-ofcustody to Cal Tech Environmental Laboratories (CTEL), a California Department of Health <br /> Services-certified analytical laboratory located in Paramount,California Each sample was analyzed <br /> for <br /> • Total petroleum hydrocarbons as gasoline (TPH-g) and total petroleum hydrocarbons as <br /> diesel (TPH-d) in accordance with EPA method 8015-Modified <br /> • Volatile organic compounds(VOCs)with fuel oxygenates in accordance with EPA method <br /> 8260B The VOCs include benzene,toluene,ethylbenzene and total xylenes(BTE&X)while <br /> the fuel additives oxygenates include di-isopropyl ether (DIPE), ethyl tertiary butyl ether <br /> ' (ETBE),methyl tertiary butyl ether(MTBE),tertiary amyl methyl ether(TANTE)and tertiary <br /> butyl alcohol (TBA) This method also detects the lead scavengers 1,2-dichloroethane <br /> (1,2-DCA) and ethylene dibromide(EDB) <br /> ' 3.0. FINDINGS <br /> Ground water elevation, flow direction and gradient were determined from field data collected on <br /> 24 January 2003 while the hydrocarbon-impact to ground water was assessed by laboratory analysis <br /> of the ground water samples <br /> 3 1 GROUND WATER ELEVATION AND GRADIENT <br /> ' Depths to ground water ranged between 29 74 and 30 54 feet below the top of the casings The <br /> ground water surface Is within the screened Intervals of wells MW-i through MW-4,which should <br /> ' yield samples representative of shallow groundwater conditions Monitoring well MW-5 is screened <br /> at approximately 35 feet below the water table and should yield water samples representative of <br /> deeper ground water conditions <br /> ' The elevation of ground water in each well was calculated by subtracting the ground water depth <br /> from the surveyed casing elevation Ground water elevations at the site ranged between 18 54 feet <br /> Advanced GeoEnvironmental,Inc <br />