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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 0024, Which is consistent with historic observed trends 1.3 Chemical Analytical Methods and Results • Eight groundwater samples were analyzed using EPA Methods 5030/8015, 602 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 (DIPS), 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. Current Quarter Groundwater Chemical Data (February 28, 2005) Sam le TPHG Ben Tot Eth l Xyl MTBE TBA DIPS ETBE TAME u /i u /l u /l u /t u /t u /] UR/1 u /] U--/l u l l MW-1 ND ND ND ND ND ND ND ND ND ND MW-2 1700 ND 13 21 57 ND ND I ND ND ND MW-3R 640 29 43 22 60 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-6 430 ND ND ND ND ND ND ND ND ND MW-7 ND ND ND ND ND ND ND I ND ND ND MW-8 ND ND ND ND ND ND ND ND ND ND MW-9R 2600 69 070 32 22 ND Nil ND ND ND Equip ND ND ND ND ND ND ND ND ND ND Blank Lab ND ND I ND I ND ND ND ND ND ND ND Blanks ND-None detected ug/l-micrograms per liter Ben-Benzene Tot-Toluene Xyl-Xylene NA—No analysis Fuel Ox -Fuel Oxygenates by Method 8260 from Dec, 1997 forward Ethyl-Ethylbenzene 1,2 Dichloroethane and Ethylene Dabromide 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 Page 2 of 4