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TABLE 1 - GROUNDWATER MONITORING AND CHEMICAL ANALYTICAL DATA Tosco (Former BP) Service Station No.11195 16500 South Interstate-5 Lathrop, California Total Well' Depth Ground Wen Elev. to Floating Water Ethyl- Total Sample Sample Depth (ft. Water Product Elevation TPHg Benzene Toluene benzene Xylenes No. Date (ft.) MSL) (ft.) (ft.) (ft.MSL) (ppb) (ppb) (ppb) (ppb) (ppb) MW-1 6/18/02 21.50 14.42 10.21 0.00 4.21 --- --- MW-2 6/18/02 20.95 13.75 9.44 0,00 4.31 --- --- ___ ___ --- MW-3 6/18/02 21.80 14.37 10.11 0.00 4.26 --- --- ___ ___ --- MW-4 6118/02 24.30 14.37 10.06 0.00 4.31 --- --- ___ MW-5 6/18/02 23.50 15.4 11.09 0.00 4.31 --- --- --- --- MW-6 6118102 19.60 12.9 8.91 0.00 3.99 --- --- __- ___ --- MW-8 6/18102 14.40 13.61 9.21 0.00 4.40 --- --- __- MW-9 6118/02 15.10 13.29 9.05 0.00 4.24 --- --- _ --- MW-10 6/18/02 15.80 12.01 8.61 0.00 3.40 --- --- ___ ___ --- MW-11 6/18102 14.25 12.08 7.69 0.00 4.39 --- --- --_ -__ --- MW-12 6/18/02 21.00 13.07 8.65 0.00 4.42 --- _-_ ___ MW-13 6118/02 21.31 15.23 11.21 0.00 4.02 <50 <0.50 <0.50 <0.50 <1.0 MW-14 6/18/02 23.31 14.29 10.26 0.00 4.03 <2,500 <25 <25 <25 <50 MW-15 6/18/02 22.41 14.94 10.97 0.00 3.97 <250 <2.5 <2.5 <2.5 <5.0 MW-16 6/18/02 23.24 12.92 11.94 0.00 0.98 <1,000 <10 <10 <10 <20 MW-17 6/18/02 19.31 13.76 9.69 0.00 4.07 <50 <0.50 <0.50 <0.50 <1.0 EXPLANATION: ANALYTICAL LABORATORY: ft.=feet Severn Trent Laboratory CA DHS (ELAP#2496) ft.MSL=feet relative to Mean Sea Level ppb=parts per billion a =Well elevations reported as top of casing(TOC)surveyed by Virgil Chavez,Licensed California Land Surveyor No. 6323 ---=Not Analyzed ANALYTICAL METHODS: TPHg=Total Petroleum Hydrocarbons as gasoline according to EPA Method 8260E Benzene,Toluene,Ethylbenzene,and Total Xylenes according to EPA Method 8260E 140193.12-2 '