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SUMMARY OF GROUNTER MONITORING DATA <br /> Fourth uarter 1992 <br /> ARCO Service Station#434 <br /> 501 West Kettleman Lane,Lodi <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) (ppb) (ppb) (ppb) (ppb) (Ppb) <br /> W-1A(77) 11/17/92 6646 -- NO NO NO NO NO <br /> W-2 11/16/92 well obstructed <br /> W-2A 11/16/92 DRY <br /> W-213(86) 11/16/92 6632 -- NO NO NO ND ND <br /> W-3(fib) 11/17/92 6592 -- 52 08 ND 1 0 1.000 <br /> W-4 11/16/92 DRY -- -- <br /> W-5(69) 11/16/92 6573 -- ND ND ND NO ND <br /> W-6(69) 11/16/92 6590 -- ND ND ND NO ND <br /> W-7 (69) 11/16/92 6528 -- ND ND ND NO ND <br /> W-8 (69) 11/17/92 6501 -- NO NO NO ND ND <br /> W-9 (78) 11/17/92 6779 -- NO ND NO NO NO <br /> W-10(78) 11/17/92 6572 -- 35 ND ND NO ND <br /> W-11 (79) 11/17192 6593 -- c0 7* ND NO ND 59 <br /> W-12(77) 11/17/92 6627 -- 11 ND ND ND ND <br /> TPH-Total petroleum hydrocarbons <br /> ND= Not detected <br /> *= Raised MRL due to matrix interference <br /> SamplingDoc OG71.017 01 <br /> I <br />