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� 1 + <br /> 12 February 2004 <br /> • AGE-NC Prod ect No 00-0769 <br />' Page 2 of 7 <br /> I <br /> I <br /> 2 2 , COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES <br /> " Ground water samples,were,collected from wells MW-1,MW-2A, MW-2B,MW-3A and MW-3B y ' <br /> utilizing new, 2-inch diameter disposable polyethylene bailers Samples were collected from wells <br /> MW-4A through MW-9D utilizing %--Inch diameter polyethylene tubing The samples were <br /> transferred into 40-m1 EPA-approved volatile organic analysis(VOA)vials containing 0 5V ml 18% <br />' hydrochloric acid as a preservative Care was taken to ensure that visible air bubbles were not present <br /> in the vials after filling and capping The sample vials were then labeled with the monitoring well <br /> designation, date, time of sampling and the sampler's imtials Following collection, samples were <br /> placed in a chilled container and transported under chain-of-custody to Cal Tech Environmental <br /> Laboratories (CTEL), a California Department of Health Services (DHS)-certified' analytical y <br /> ' laboratory, and analyzed for ' <br />' Total petroleum hydrocarbons quantified as gasoline (TPH-g) In accordance with EPA <br /> Method 8015 Modified, and <br />' VOCs,including benzene,toluene,ethyl benzene and xylenes(BTEX)and the fuel additives <br /> methyl tertiary butyl ether (MTBE), di-isopropyl ether (DIPE), ethyl tertiary butyl ether <br /> '(ETBE), tertiary amyl methyl ether (TAME), tertiary butyl alcohol (TBA), 1,2 <br />' dibrombethane (EDB) and 1,2-dichloroethane (1,2-DCA) in accordance with EPA Method <br /> 8260B <br /> 23 WELL ELEVATION SURVEY <br /> In October 2003,a California state-licensed survey engineer from Mid-Coast Engineers Inc surveyed <br /> a reference point on thettop of ground water monitoring wells MW-4 and MW-5 casings at the site <br /> to the nearest 0 01466t relative to the City of Stockton Bench Mark The results of the monitoring <br />' I well survey are contained in Table 1 , <br /> 1 <br /> I <br /> 3.0. FINDINGSF t , <br />' Ground water elevation,flow directiodand gradient were inferred from field data The hydrocarbon- <br /> impact to ground water`was quantified by laboratory analysis of ground water samples <br /> I <br /> 1 3 1 GROUND WATER ELEVATION AND GRADIENT # <br />' Depth to ground water was between 25 81 feet (MW-8A),and 30 52 feet (MW-5E) below the tops , <br /> of the w6ll casings on 02 September 2003 Relative ground water elevations ranged from 16 13 feet <br /> • (MW-3B) to 19 85 feet(MW-5E)below mean sea level (MSL) ' <br /> Advanced GeoEnvironmental,Inc <br /> n t <br /> I <br /> f <br />