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i15 November 2004 <br /> . AGE-NC Project No 96-0229 <br />' Page 3 of 6 <br /> filling and capping Ground water sample containers were labeled with the well designation, date, <br /> time, and sampler's initials <br /> 2 1 2 Laboratory Analysis Of Ground Water Samples <br />' Each ground water sample was logged on a chain of custody form,placed In a chilled container, and <br /> transported to a California Department of Health Services (DHS)-certified laboratory for analysis <br /> for <br />' • Total petroleum hydrocarbons quantified as gasoline (TPH-g) by EPA Method <br /> SW5030/8015, <br />' • Benzene, toluene, ethylbenzene, and xylenes (BTEX) by EPA Method 8020, and <br /> • Ethylene dibromide (EDB), 1,2-dlchloroethane (1,2-DCA), tert-butyl alcohol (TBA), di- <br /> isopropyl ether(DIPE), ethyl tert-butyl ether(ETBE), tert-amyl methyl ether(TAME), and <br /> methyl tert-buyl ether (MTBE) by EPA Method 8260 <br /> 3.0. FINDINGS <br /> Ground water monitoring field data was utilized to determine ground water flow direction and <br /> gradient on 01 June 2004,hydrocarbon impact to ground water was quantified by laboratory analysis <br /> of samples collected between 01 and 02 June 2004 <br /> 3 1 GROUND WATER ELEVATION AND GRADIENT <br /> The 01 June 2004 ground water elevations at wells MW-1 through MW-19 were calculated by <br /> subtracting the measured depth to ground water from the surveyed casing elevations The ground <br /> water elevation data collected from the site was plotted for the informal hydrogeologic flow units <br /> `First Water Zone' and `Second Water Zone' as defined in AGE's Multi-Level Monitoring Well <br /> Installation Report (dated 10 May 2004) <br /> The depth to ground w iter measurements vaned from the purged.yells between 30 80 feet(l���h�_5) <br /> and 33 14 feet(MW-12)below the tops of the well casings,groundwater elevations were calculated <br /> to be between 18 15 feet (MW-4) and 21 10 feet (MW-18D) below mean sea level Generally, <br /> ground water elevation at the site increased an average of 1 31 feet between the November 2003 and <br /> the June 2004 ground water momtonng events <br /> IAdvanced GeoEnvironmental,Inc <br />