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1.2 Groundwater Contour Map and Flow Gradient A groundwater contour map to a known datum was prepared for the data listed in Table 1 (see Figure 1) The groundwater flow direction was northerly under a calculated gradient of 0 0032 that is consistent with historic observed trends 1.3 Chemical Analytical Methods and Results Eight groundwater samples were analyzed using EPA Methods 5030/8015, and 8260 for Total Petroleum Hydrocarbons as Gasoline (TPHG), Benzene, Toluene, Ethylbenzene and Xylene (BTEX) and fuel oxygenates including Methyl-tert-butyl-ether (MTBE), Tert-Butyl Alcohol (TBA), Di-Isopropyl Ether (DIPE), Ethyl tert-butyl ether (ETBE), Tert-Amyl Methyl Ether TAME) The analytical results of the groundwater samples for this sampling event are attached and listed below in Table 1 (and Figures 2, 3 and 4, and historic data is presented in attached historic sampling data spreadsheet Table 2) Table 1. Groundwater Chemical Data (June 1, 2005) Sample TPHG Ben Tol Ethyl X 1 MTBE TBA DIPE ETBE TAME u u A UgA u UgA UVA u A UYA UgA u MW-1 ND ND ND ND ND ND ND ND ND ND MW-2 I900 20 3 9 28 54 ND ND ND ND ND MW-3R ND ND ND j ND ND ND ND ND ND ND MW-4 ND ND ND ND ND ND ND ND ND ND MW-5 ND ND ND ND ND ND ND ND ND ND MW-6 240 ND ND ND ND ND ND ND ND ND MW-7 ND ND ND ND ND ND ND ND ND ND MW-8 ND ND ND ND ND ND ND ND ND ND MW-9R 260 47 ND 24 ND ND ND ND ND ND Equip ND ND ND ND ND ND ND ND ND ND Blank Lab ND ND ND ND ND I ND ND ND ND ND Blanks ND-None detected ug/l-micrograms per Mer Ben-Benzene Tol-Toluene Xyl-Xylene NA—No analysis Fuel Ox -Fuel Oxygenates by Method 8260 from Dec, 1997 forward Ethyl-Ethylbenzene 1,2 Dichloroethane and Ethylene Etbionude ND in all wells,these analyses discontinued in 2000 See historic data table for previous monitoring well sampling results Wells MW-3 and 9 were replaced in Oct 2004, re- designated MW-3R and MW-9R respectively I i I Page 2 of 4