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SUMMARY OF GROUND-WATER MONITORING DATA <br /> First Ouarter 1992 <br /> ARCO Service Station 2093 <br /> 3425 Tracy Boulevard,Tracy <br /> (micrograms per liter(ug/1) or parts per billion (ppb) <br /> Floating <br /> Well ID Depth to Product Total TPH as <br /> and Sample Sampling Water Thickness Benzene Toluene Ethylbenzene Xylenes Gasoline <br /> Depth Date feet feet b b b b b <br /> ATR-i (27) 4120/92 1258 -- ND ND ND ND ND <br /> ATA-2(29) 4/20/92 1153 - - ND ND ND ND ND <br /> ATR-3 no sample 11 93 001 - - -- - - - - - - <br /> ATR-4 <br /> -ATR-4 (29) 4121192 11 12 -- 150 <5' 36 29 560 <br /> ATR-5(26) 4121192 1070 - 1 6 ND 2 0 ND 290 <br /> ATR-6(26) 4121192 1156 - ND ND ND ND ND <br /> ATR-7 no sample - - <br /> ATR-8(24) 4121192 811 - 14 09 14 93 140 <br /> ATR-9(24) 4121/92 1088 ND ND ND ND ND <br /> ATR-10 (24) 4/21/92 1001 - ND ND ND ND ND <br /> ATR-11 (23) 4121192 878 ND ND ND ND ND <br /> ATR-12 (24) 4121/92 900 ND ND ND ND ND <br /> TPH =Total petroleum hydrocarbons <br /> ND= Not detected <br /> = Raised MRL due to high analyte concentration requiring sample dilution <br /> i <br />