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Second Quarter 2002 Groundwater Monitoring Report Moore Petroleum Bulk Plant,5491 F Street,Banta,California rr� Page 4 GROUNDWATER MONITORING Groundwater Levels On April 30, 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 April 30, 2002, and shows groundwater flow beneath the subject site to be towards the northeast at an approximate hydraulic gradient of 0.0022 ft/ft. Groundwater Sampling and-Analysis On April 30, 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: Analysis lAbbreviation I Designation I USEPA Method No. Total Petroleum Hydrocarbons TPHg as Gasoline Total Petroleum Hydrocarbons TPHd Gas/Diesel- as Diesel Total Petroleum Hydrocarbons Range 8015 Modified as Kerosene Kerosene Hydrocarbons 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 DIPS Oxygenates 8260B Ethyl Tertiary Butyl Ether ETRE Tertia Amyl Methyl_Ether TAME