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r <br /> Unocal Corporation March 1993 <br /> Tracy,CalifarrnRev 0a 2168T001 wki <br /> Quarterly Monitoring&Sampling Report <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) (Ppb) <br /> ' MW-1 07/15/91 ND NO =Nb ND NO <br /> 08/15/91 NO NO ND NO ND <br /> 03/17/93 NO ND ND NO ND <br /> i <br /> MW-2 07/15/91 ND ND ND ND ND <br /> 08/15/91 ND NO ND ND ND <br /> 12111/91 ND NO NO NO ND <br /> 03/13/92 NO ND NO NO NO <br /> r 06/10/92 ND ND NO ND ND <br /> 09/21/92 ND NO ND ND ND <br /> 03/17/93 ND NO NO ND NO <br /> MW-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 46 <br /> 03/13/92 ND NO ND ND ND <br /> 06/10/92 200 39 NO ND 070___] <br /> ' 09/21/92 2408fi — ND 12 28 <br /> 11/24/92 WELL ABANDON ED --- <br /> ' MW-4 07/15/91 50 NO ND 07 53 <br /> 08/15/91 ND ND ND ND ND <br /> 09/12/91 NO ND ND ND NO <br /> 12/11/91 ND ND ND ND ND <br /> 03/13/92 ND ND NO NO NO <br /> 06/10/92 NO NO ND ND ND <br /> 09/21/92 ND ND NO ND ND <br /> 03/17/93 ND ND NO ND ND <br /> Detection Limits 50 0 5 05 05 0 5 <br /> NOTES <br /> Results are in parts per billion (ppb) <br /> TPH—G=Total petroleum hydrocarbon as gasoline <br /> ND = Not detected at analytical detection iimft <br /> / C�ittelhauser <br /> O R A O R A T 1 O N <br /> Page 1 of 1 <br /> r <br />