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rl n 14 May 2004 AGE-NC Project No. 95-0137 Page 2 of 4 After recording water level measurements, disposable plastic bailers were used to purge the wells of standing water. Approximately 3 to 5 gallons of water(a minimum of 3 casing water-volumes per well)were removed from MW-1 through MW-5;well MW-2 was purged dry after 3 gallons of water were removed. Ground water temperature,pH and conductivity were measured at regular intervals during purging using an Oakton water analyzer. Purged ground water was containerized in properly labeled Department of Transportation(DOT)-approved model 17H 55-gallon drums and was stored on-site. Field sheets and data are included in Appendix A. 2.1.2. Collection and Analysis of Ground Water Samples Water samples were collected from the purged wells using new disposable plastic bailers after allowing the wells to achieve a minimum 80%recovery of the pre-purge water volume. Each sample was transferred into three 40-m1 EPA-approved volatile organic analysis (VOA) vials and into one 1-liter amber bottle. Samples were properly labeled, stored in a chilled container and transported under chain-of-custody to Cal Tech Environmental Laboratories (CTEL) a California Department of Health Services (DHS)-certified laboratory in Paramount. Each sample was analyzed for. • Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d) in accordance with EPA Method 8015 Modified; and • BTEX compounds and the oxygenating fuel additives: methyl tertiary butyl ether(MTBE), tertiary butyl alcohol(TBA),di-isopropyl ether(DIPE),ethyl tertiary butyl ether(ETBE)and tertiary amyl methyl ether(TAME),ethylene dibromide(EDB)and 1,2 dichloroethane(1,2- DCA) in accordance with EPA Methods 8260. 3.0. FINDINGS Ground water elevation, flow direction and gradient were determined from field data collected on 23 March 2004; the contaminant impact to ground water was quantified from the ground water laboratory data. 3.1. GROUND WATER GRADIENT AND FLOW DIRECTION Depths to ground water during the March 2004 monitoring event ranged from 25.27 to 26.46 feet below the well casing tops;the depth to ground water remained stable between the November 2003 .! and March 2004 monitoring events. The calculated ground water elevations ranged from 31.28 feet (MW-4) to 31.63 feet (MW-3) and 34.72 feet (MW-5), and ground water flow was inferred to be Advanced G eoEnvi ron menta 1,Inc.