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Third Quarter 2001 Groundwater Monitoring Report Moore Petroleum Bulk Plant,5491 F Street,Banta,Califomia Page 4 GROUNDWATER MONITORING Groundwater Levels On July 17, 2001, Apex personnel collected water-level measurements from eleven groundwater monitoring wells (MW-1, MW-2, MW-3, MW-4A, MW-5, MW-7 through MW-12), and one vapor extraction well (VEW-2). All groundwater elevations 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 July 17, 2001 and shows groundwater flow beneath the subject site to be towards the northeast at an approximate hydraulic gradient of 0.0036 ft/ft. Groundwater Sampling and Analysis Apex personnel collected groundwater samples from thirteen wells (MW-1, MW-2, MW-3, MW-4A, MW-5, MW-7 through MW-12), 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: Anal sis Abbreviation Designation USEPA Method No. Total Petroleum Hydrocarbons TPHg as Gasoline Total Petroleum Hydrocarbons TPHd as Diesel I Aromatic 8015 Modified Total Petroleum HydrocarbonsKerosene Hydrocarbons as Kerosene Total Petroleum Hydrocarbons Motor Oil 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 Ethyl TertiaryButyl Ether ETBE $260 Tertiary Amyl Methyl Ether TAME Methanol ENaphthaleneLL ethanol Naphthalene