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TABLE 1-SUMMARY OF RESULTS OF GROUNDWATER SAMPLING BP OIL COMPANY SERVICE STATION NO.111195 16500 SOUTH INTERSTATE 1-5,LATHROP,CALIFORNIA ALISTO PROJECT NO.10-151 WELL DATE OF CASING DEPTH TO GROUNDWATER TPH-G TPH-D B T E X TOG HVOCs LAB 1D SAMPLING/ ELEVATION (a) WATER ELEVATION (b) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) MONITORING (Feet) (Feet) (Feel) MW-1 12/21192 14.39 11.18 3.21 ND<50 - ND<0.5 ND<0.5 ND<0.5 ND<0.5 - - PACE MW-1 05/17/93 14.39 8.41 5.96 ND<50 ND<0.5 ND<0.5 0.6 2.1 - - PACE MW-1 09/15/93 14.39 9.78 4.61 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - - PACE MW-2 12/21/92 14.20 10.96 3.24 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - --- PACE MW-2 05/17/93 14.20 8.20 6.00 120 - 1.8 0.6 1.2 1 - - PACE MW-2 09/15/93 14.20 9.58 4.62 2800 - 97 ND<2.5 290 250 - - PACE MW-3 12/21/92 15.10 11.84 3.26 1300 - 6.7 3.1 9.1 310 - - PACE MW-3 05/17/93 15.10 9.05 6.05 3600 - 20 9.3 470 700 - - PACE QC-1 (c) 05117M - - - 4000 - 23 12 520 810 - - PACE MW-3 09/15193 15.10 10.44 4.66 38000 - 770 34 1700 3300 - - PACE MW-4 12/21/92 14.32 11.06 3.26 10000 ND<5 ND<2.5 3.5 300 540 ND<50 ND (d) PACE MW-4 05/17/93 14.32 6.25 6.07 6600 - 7.7 3.3 840 1000 - - PACE MW-4 09/15/93 14.32 9.64 4.68 16000 - ND<12 ND<12 1000 1300 - - PACE QC-1 (c) 09/15W - -- -- 16000 - 16 ND<12 1000 1200 - - PACE MW-5 12/21/92 16.00 12.74 3.26 ND<% - ND<0.5 ND<0.5 ND<0.5 ND<0.5 - - PACE MW-5 05/17/93 16.00 9.94 6.06 ND<50 110 ND<0.5 ND<0.5 ND<0.5 ND<1.0 ND<5.0 ND (d) PACE MW-5 09/15/93 16.00 11.31 4.69 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - - PACE MW-6 09/15/93 13.56 8-98 4.56 400 - 2.4 ND<0.5 ND<0.5 ND<0.5 -- -- PACE MW-7 09/15/93 14.27 9.59 4.68 ND<50 - ND<0.5 ND<0.5 ND<0.5 ND<0.5 - - PACE QC-2 (e) 05117193 - - - ND<50 --- ND<0.5 ND<0.5 ND<0.5 ND<1.0 - - PACE OC-2 (e) 09/15/93 - - - ND<W -- ND<0.5 ND<0.5 ND<0.5 ND<0.5 - - PACE ABBREVIATIONS: NOTES; TPH-G Total petroleum hydrocarbons as gasoline (a) Top of casing elevations surveyed in reference to San Joaquin datum, TPH-D Total petroleum hydrocarbons as diesel brass cap UV-34 at Mathey Road,45 feet north and 52 feet west of centerline. B Benzene (Elevation of 12.50 feet above mean sea level.) T Toluene E Ethylbenzene (b) Groundwater elevations in feet above mean sea level. X Total xylenes TOG Total oil and grease (c) Blind duplicate sample. HVOCs Halogenated volatile organic compounds ppb Parts per billion (d) Detection limits vary. ND Not detected above reported detection limit Not analyzedlavalable (e) Travel blank. PACE Pace,Inc. 24-Jan-94 PAGE 1