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Unocal Corporation March 1993 <br /> Tracy Calrfomia Rev 0 <br /> Cluarterly Monitoring &Sampling Report 2168TO01 wk1 <br /> TABLE 1 <br /> SUMMARY OF GROUNDWATER ANALYTICAL RESULTS <br /> WELL SAMPLING TPH—G BENZENE TOLUENE ETHYL— XYLENES <br /> NUMBER DATE BENZENE <br /> (Ppb) (Ppb) (ppb) (ppb) (Pleb) <br /> MW-1 07/15/91 NO ND NO NO NO <br /> 08/15/91 NO NO NO ND NO <br /> 03/17/93 NO NO NO NO ND <br /> t <br /> MW-2 07/15/91 NO NO ND ND ND <br /> 08/15/91 ND ND I NO ND NO <br /> 12/11(91 N D== NO ND NO NO <br /> 03/13/92 ND NO I ND NO I NO <br /> 06/10/92 ND ND---T ND ND ND <br /> 09/21/92 NO I NO I ND ND ND <br /> 03/17/93 ND NO NO NO NO <br /> iMW-3 07/15/91 230 35 05 12 14 <br /> 08/15/91 550 110 NO 94 14 <br /> 12/11/91 390 70 11 60 4 6 <br /> 03/13/92 ND I ND ND NO NO <br /> 06/10/92 200 39 ND NO 070 <br /> 09/21/92 240 I 86 NO 12 28 <br /> 11/24/92 ( --- WELL ABANDON ED --- <br /> MW-4 07/15/91 50 ND ND 07 53 <br /> 08/15/91 NO NO ND NO NO <br /> 09/12/91 NO ND ND ND ND <br /> 12/11/91 NO ND I ND NO NO <br /> 03/13/92 NO NO ND NO NO <br /> 06/10/92 NO NO NO NO NO <br /> 09/21/92 NO ND ND NO ND <br /> 03/17/93 ND NO ND NO NO <br /> Detection Limits L 50 05 05 05 05 <br /> NOTES <br /> Results are in parts per billion (ppb) <br /> TPH—G= Total petroleum hydrocarbon as gasoline <br /> NO = Not detected at anaiytcal detection limits <br /> /Mittelhauser <br /> c o a n a x a r i a <br /> Page 1 of 1 <br />