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f J First Quarter 2002 Groundwater iVionitoring Report Moore Petroleum Bulk Plant,5491 F Street,Banta,California Page 4 GROUNDWATER MONITORING Groundwater Levels On February 11, 2002, Apex personnel collected depth to water measurements from groundwater monitoring wells MW-1, through MW-5, MW-7 through MW-12, recovery well RW-2, and vapor extraction well VEW-2. All depth to groundwater were measured to the nearest 0.01 foot, referenced to the, surveyed top-of-casing elevations, and conducted according to the Apex standard operating procedures (SOP) included as Appendix A. Groundwater level measurements collected by Apex are summarized in Table 1 and field data sheets are included as Appendix B. Figure 3 is a groundwater contour map of the shallow water-bearing zone on February 11, 2002, and shows groundwater flow beneath the subject site to be towards the northeast at an approximate hydraulic gradient of 0.0018 ft/ft. Groundwater Sampling and Analysis On February 11, 2002, Apex personnel collected groundwater samples from monitoring wells MW-1 through MW-5, MW-7 through MW-12, RW-2, VEW-2, and the off-site domestic well according to the Apex SOP included in Appendix A. The samples were submitted, under chain- of-custody, to California Laboratory Services (CLS) of Rancho Cordova, California and analyzed for the following: Anal sis Abbreviation Designation USEPA Method No. Total Petroleum Hydrocarbons TPHg as Gasoline Total Petroleum Hydrocarbons TPHd as Diesel Aromatic 8015 Modified Total Petroleum Hydrocarbons Hydrocarbons as Kerosene Kerosene Total Petroleum Hydrocarbons TPHmo as Motor Oil Benzene Aromatic Toluene BTEX Volatile 8020 Eth (benzene Organics Xylenes Total Tertiary Butyl Alcohol TBA Methyl Tertiary Butyl Ether MTBE Fuel Di-isopropyl Ether DIPE Oxygenates 8260 Ethyl Tertiary Butyl Ether ETBE Tertiary Amyl Methyl Ether TAME