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I 11 December 2000 �. AGE-NC Project No 97-0312 IPage 2 of 4 { ' the water column to remove watcr'trapped within the unscreened interval of the well casings Temperature,pH and conductivity of purged water were measured at regular intervals dunng purging .using a Hydac water analyzer The recorded field data and logs are included in Appendix A Purged ' water was stored on-site in 55-gallon DOT-approved drums pending laboratory analysis , 22 COLLECTION OF GROUND WATER SAMPLES The depth to water'was re-measured following purging to assure a minimum of 80%recharge prior to sampling Water samples were retrieved from each purged well using new disposable bailers To sample the domestic wells, a sanmp�mg port was opened at the well head and samples were collected from the sampling port while the pump was operating to obtain fresh water samples Each sample 'r was transferred into laboratory-supplied 40-m1 EPA-approved VOA vials containing 0 5 ml of 18% hydrochloric acid as a sample preservative and into 1-liter amber bottles without preservative The samples were labeled, placed in a clulled container and transported under chain-of-custody to ' McCampbell Analytical Inc (MAI)in Pacheco,a California Department ofHealth Services(DHS)- certified analytical laboratory The samples were analyzed for 1 % b • Total petroleum hydrocarbons quantified as gasoline (TPH-g) and diesel (TPH-d) in accordance with EPA Methods 5030 and 8015m, ' • Volatile aromatic hydrocarbons benzene, toluene, ethylbenzene and total xylenes (BTEX) with methyl tertiary-butyl eiher (MTBE) in accordance with EPA Method 8020.602, n r • Volatile organics and fuel oxygenates MTBE, di-isopropyl ether (RIPE), ethyl tert-butyl ' ether (ETBE), tert-amyl methyl ether (TAME) and tert-butanol (TBA) in accordance with EPA Method 8260 modified, and • Chlorinated hydrocarbons by EPA Method 8260 Ground water samples were collected on 20 September 2000 from the,two on-site domestic wells ! +I and were analyzed for volatile'organic compounds only , 4 ; I r rr -3.0. FINDINGS ' 1 ' Ground water elevations were determined by subtracting the measured depths-to-water from the surveyed casing I elevations (Table 1) Ground water flflw direction was determined by contouring , the water elevations on a scaled site plan. (Figure 4) Hydrocarbon-impact to ground water was ' inferred from laboratory,analysis and field'observations ! r S— Advanced GeoEnvkronmental,Inc' ( a r 1 ' i r ' 1 J I !