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TABLE 1-SUMMARY OF RESULTS OF GROUNDWATER SAMPLING BP OIL COMPANY SERVICE STATION NO.11195 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 ID SAMPLING! ELEVATION(a) WATER ELEVATION (b) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) MONITORING (Feet) (Feet) MW-1 120/92 14.13 11.18 2.95 ND<50 - ND<0.5 ND<0.5 ND<0.5 ND<0.5 --- - PACE MW-1 05/17/93 14.13 8.41 5.72 ND<50 --- ND<0.5 ND<0.5 0.6 2.1 --- PACE MW-2 12/21/92 13.94 10.96 2.98 ND<50 --- ND<0.5 ND<0.5 ND<0.5 ND<0.5 -- - PACE MW-2 05/17/93 13.94 8.20 5.74 120 - 1.8 0.6 1.2 1 - - PACE MW-3 12/21/92 14.83 11.84 2.99 1300 - 6.7 3.1 9.1 310 - - PACE MW-3 05/17/93 14.83 9.05 5.78 3600 --- 20 9.3 470 700 - - PACE OC-1 (c) 05/17/93 -- --- --- 4000 - 23 (d) 12 520 810 - - PACT" MW-4 12/21/92 14.06 11.06 3.00 10000 ND<5 ND<2.5 3.5 300 540 ND<50 ND (e) PACE MW-4 05117/93 14.06 8.25 5.81 6600 - 7.7 3.3 840 1000 -- PACE MW-5 12121/92 15.74 12.74 3.00 ND<50 -- ND<0.5 ND<0.5 ND<0.5 ND<0.5 - - PACE MW-5 05/17/93 15.74 9.94 5.80 ND<50 110 ND<0.5 ND<0.5 ND<0.5 ND<1.0 ND<5.0 ND (e) PACE OC-2 (Q 05/17/93 - - --- ND<50 -- ND<0.5 ND<0.5 ND<0.5 ND<1.0 - - PACE ABBREVIATIONS: NOTES: TPH-0 Total petroleum hydrocarbons as gasoline (a) Top of casing elevations surveyed in reference to the San Joaquin Datum,and given TPH-D Total petroleum hydrocarbons as diesel in feet above mean sea level relative to the National Geodetic Survey. B Benzene T Toluene (b) In feet above mean sea level. E Ethylbenzene X Total xylenes (c) Blind duplicate sample. TOG Total oil and grease HVOCs Halogenated volatile organic compounds (d) A peak eluting earlier than benzene and suspected to be methyl tent butyl ether was present. ppb Parts per billion Not analyzed/available (e) HVOCs detection limits vary. ND Not detected above reported detection limit PACE Pace,Inc. (f) Travel blank. 17-Jun-93 PAGE i