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Trace Analysis Laboratory, inc. Telephone (510) 783-6960 <br /> 3423 investment Boulevard, #8 + Hayward, California 94545 Facsimile (510) 783-1512 <br /> --- — — LOG NUMBER 2909 <br /> DATE SAMPLED. 01/29/92 <br /> DATE RECEIVED 01/29/93 <br /> DATE ANALYZED. 02/02/93 <br /> DATE REPORTED- 02/12/93 <br />' CUSTOMER Conoco, Inc. <br /> tREQUESTER. Bill Bassett of DuPont Environmental Remediation Services, Inc. <br /> PROJECT: No 0511-42-5010-04, Stockton <br /> Sample Type: Water <br /> MW-27 MW-28 MW-29 <br />' Method and Concen- Reporting Concen- Reporting Concen- Reporting <br /> Constituent: Units tration Limit tration Limit tration Limit <br />' DHS Method. <br /> Total Petroleum Hydro- <br /> carbons as Gasoline ug/l NO 50 ND 50 ND 50 <br /> Modified EPA Method 8020 for <br /> Benzene ug/l ND 0 50 ND 0.50 NO 0 50 <br /> Toluene ug/l NO 0.50 NO 0 50 ND 0 50 <br /> Ethylbenzene ug/l NO 0.50 ND 0 50 ND 0.50 <br />' Xylenes ug/l NO 1 5 ND 1 .5 NO 1.5 <br />' Concentrations reported as ND were not detected at or above the reporting limit. <br /> 1 <br />' Founding Member of the Association of California Testing Laboratortes A-4 <br />