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TABLE 1-SUMMARY OF RESULTS OF GROUNDWATER SAMPLING BP OIL COMPANY SERVICE STATION NO.11193 3202 WEST HAMMER LANE,STOCKTON,CALIFORNIA ALISTO PROJECT NO.10-136 WELL DATE OF CASING DEPTH TO GROUNDWATER TPH-G TPH-D TPR B T E X HVOC DO LAB ID SAMPLING/ ELEVATION(a) WATER ELEVATION (b) (ugh) 094) (u9A) (agA) (ug/1) NO) (UDI) (ug0) (ppm) MONITORING (Feet) (Feet) (Feet) MW-5 04/25/04 4-36 17.40 -13.02 170 - - 34 1.0 ND<0.5 6.1 -- 3.9 PACE MW-5 07!28/94 4.38 17.86 -13.48 1000 - 440 19 10 38 -- 3.9 PACE QG1 (c) 07128x34 - - --- 1200 - - 470 23 11 46 - --- PACE MW-5 12119/94 4.38 18.34 -13.96 930 -- --• 260 5.3 31 21 -- 4.6 PACE OGi (c) 12/09/94 - - - 1000 - 280 6 34 24 - --- PACE MW-5 03MI95 4.38 16.99 -12.61 1200 - -- 450 7.4 5.9 28 - 5.4 ATI MW-5 04/12/95 4.38 15.71 -11.33 1413450 - --- 9.0 ND<0.50 2.6 1.5 - 7.9 ATI MW-5 07/20195 4.38 16.00 -11.62 4100 - 220 ND<6.0 28 ND<to - 6.7 ATI MW-6 041251'94 3.56 16.73 -13.17 53 - ND<0.5 ND<0.5 0.6 2.4 -- 2.0 PACE MW-6 07211/94 3.58 17.20 -13.64 69 -- - ND<0.5 ND<0.5 ND<0,5 ND<0.5 2.2 PACE MW-6 12/09194 3.56 17.70 -14.14 ND--% -- ND<0.5 ND<0.5 ND<0,5 ND<t - 3.5 PACE MW-6 03X/3/95 3.56 16.34 -12.76 ND<50 -• -- 0.63 ND<0.50 ND<0.50 ND<1.0 -- 4.3 ATI MWS 04/12/95 3.56 15.05 •11.49 57 -- -- ND<0.50 0.52 ND<0.50 ND<1.0 -- 4.6 ATI MW-6 07/20/96 3.56 15.37 -11.81 ND<50 - - ND<0.50 ND<0.50 ND4.50 ND<1.0 - 7.3 A71 MW-7 04/25/94 4.48 17.59 -13.13 76 - -- 1.0 ND<0.5 ND4.5 2.0 -- 4.7 PACE MW-7 0728/94 4.46 18.06 -13.60 67 -- -- 6.8 ND<0.5 ND<o.5 ND<0.5 -- 46 PACE MW-7 12!09194 4.46 10.78 -14.32 57 -- - 5.1 0.5 ND4.5 ND<t -- 4.7 PACE MW7 03/Q9195 4.45 17.40 -12.94 ND<50 - 6.8 ND<0.50 ND<0.50 ND<1.0 - 4.3 ATI MW-7 04/1295 4.46 16.29 -11.83 ND<50 - - 4.6 NDc0.50 ND<0.50 ND<1.0 -- 7.8 ATI MW-7 0712M95 4.46 1626 -11.80 ND<50 --- -- 3.1 ND<o.50 ND<0.50 ND<1.0 -- 5.3 ATI QC-2(1) 04/04193 -- -- - ND<50 -- -• N13<0.5 ND<0.5 ND-o,5 ND<0.5 -- --- PACE QC-2(f] 10/05193 - -- - ND<50 -- ND<0.5 ND<0.5 ND<0.5 ND<0.5 -- --- PACE OC-2(i) 01/07194 __ - - ND<50 - ND<0.5 ND<0.5 ND<0.5 ND<0.5 - --- PACE OC-2(f) 0420194 - - - ND<% -- - ND<0.5 ND<0.5 ND<0.5 ND4.5 - -- PACE OC-2(0 072&94 - -- ND<50 - -- ND<0.5 ND<0.5 ND<0.5 ND<0.5 -- --- PACE OC-2(I) 12/09194 --- - -- ND<50 -- - ND4.5 ND<0.5 ND<0.5 ND-1 --- PACE QC-2(I) 03/03/95 - - - ND<50 - - ND<0.50 ND<0.50 ND<oso ND<1.0 --- --- ATI OC 2(1) 04/12/95 - - - ND<50 -- -- ND<0.50 ND<0,50 1140<0.50 ND<1.0 - ATI OC-2(f) 07!20195 - - ND<50 -- - ND<0.50 ND<0.50 ND<0.5o ND<1.0 - ATI ABBREVIATIONS: NOTES: TPH-G Total Petroleum hydrocarbons as gasoline (a) Casing elevations surveyed to rhe nearest 0.01 hoot relative to mean sea level. TPH-D Total Petroleum hydrocarbons as desel TPH Total petroleum hydrocarbons (b) Groundwater elevations in feet above mean sea level. B Benzene T Toluene (c) Bind duplicate. E Ethylbenzene X Total xylenes (d) Semple pattern does not match gasoline standard pattern. HVOC Halogenated volatile organic conyxxinds DO Dissolved oxygen (e) Detection imi%vary;see laboratory report. ug4 Micrograms per liter ppm Parts per rrW4ion (I) Travel blank. Not rneasured/analyzed/appticable ND Not detected above reported detection unit PACE Pace,Inc. ATI AnalyCcal Tectvialogies,Inc. erwarxrxcr.wo� V 29-Aug-95 PAGE 2-