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Each groundwater sample was collected with a new disposable bailer. The groundwater sample <br /> was then poured with minimum cavitation into the appropriate, laboratory prepared sample <br /> containers leaving minimum headspace. The sample container was then immediately capped, <br /> labeled under chain-of-custody documentation and placed in a chilled ice chest for shipment to <br /> STL/Chromalab, Inc. in Pleasanton, California (a State Certified Testing Lab). <br /> 2.2 Groundwater Contour Map and Flow Gradient <br /> A groundwater contour map to a known datum was prepared for the data listed in Table 1 (see <br /> Figure 1). The groundwater flow direction was northerly under a calculated gradient of 0.0023, <br /> which is consistent with historic observed trends. <br /> 2.3 Chemical Analytical Methods and Results <br /> Eight groundwater samples were analyzed using EPA Methods 50301$015, 602 and 8260 for <br /> Total Petroleum Hydrocarbons as Gasoline (TPHG), Benzene, Toluene, Ethylbenzene and <br /> Xylene (BTEX) and fuel oxygenates including Methyl-tert-butyl-ether (MTBE), Tert-Butyl <br /> Alcohol (TBA), Di-Isopropyl Ether (DIPE), Ethyl tert-butyl ether (ETBE), Tert-Amyl Methyl <br /> Ether TAME). The analytical results of the groundwater samples for this sampling event are <br /> attached and listed below in Table 1 (and Figures 2, 3 and 4, and historic data is presented in <br /> attached historic sampling data spreadsheet Table 2). <br /> Table 1. Current Quarter Groundwater Chemical Data (November 19,2004) <br /> Sample TPHG Ben Tol Ethyl X 1 MTBE TBA DIPE ETBE TAME <br /> u /l u /l u /l u Il u /i ug/1 u ll u /l u /l ug/1 <br /> MW-1 ND ND ND ND ND ND ND ND ND ND <br /> MW-2 1800 0.75 1.4 17 4.9 ND ND ND ND ND <br /> MW- 260 ND ND 0.54 1.2 ND ND ND ND ND <br /> 3R <br /> MW-4 ND ND ND ND ND ND ND ND ND ND <br /> MW-5 1 ND ND ND ND ND ND ND ND ND ND <br /> MW-6 340 ND ND ND ND ND ND ND ND ND <br /> MW-7 ND ND ND ND ND ND ND ND ND ND <br /> MW-8 ND ND ND ND ND ND ND ND ND ND <br /> MW- 3900 39 16 250 340 ND ND ND ND ND <br /> 9R <br /> Equip. ND ND ND ND ND ND ND ND ND ND <br /> Blank <br /> Lab ND ND ND ND ND ND ND ND ND ND <br /> Blanks <br /> ND-None detected ug/l-micrograms per liter. Ben-Benzene Tol-Toluene Xyl-Xylene NA—No analysis <br /> Fuel Ox.-Fuel Oxygenates by Method 8260 from Dec., 1997 forward. Ethyl-Ethylbenzene <br /> 1,2 Dichloroethane and Ethylene Dibromide ND in all wells;these analyses discontinued in 2000. <br /> See historic data table for previous monitoring well sampling results. No Data—Car parked over Well MW-5 on January 12, <br /> Page 3 of 5 <br />