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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 /> f <br /> LOG NUMBER* 3424 <br /> --- _ - DATE SAMPLED: 07/09/93 <br /> _— DATE RECEIVED. 07/12/93 <br /> DATE ANALYZED- 07/13/93 <br /> DATE REPORTED. 07/26/93 <br />' CUSTOMER' Conoco, Inc. <br /> REQUESTER Lenard Long of Sunriver Engineering and Construction, Inc <br /> PROJECT: No. 93036, Stockton <br />' Sam le Type: Va o <br /> Method Blank <br /> Method and Concen- Reporting Concen- Reporting <br />' Const)tuent Units tration LIMA tration Limit <br /> Modified DHS Method <br />' Total Petroleum Hydro- <br /> carbons as Gasoline mg/m3 ND 810 ND 10 <br /> Modified EPA Method 8020 for <br /> enzene mg/m3 8.8 3 4 ND 0. 10 <br />' Toluene mg/m3 16 3 4 ND 0 10 <br /> Ethylbenzene mg/m3 22 3.5 ND 0 10 <br /> Xylenes mg/m3 180 9 1 ND 0 30 <br /> OC Summary: .. <br />' % Recovery: 98* <br /> % RPD: 26 <br />' Concentrations reported as ND were not detected at or above the reporting limit <br />' * The Recovery for vapor samples is based on the Laboratory Control Sample <br /> Louis W DuPuis <br />' Quality Assurance/Quality Control Manager <br /> 1 <br /> Founding Member of the Association of California Testing Laboratories <br />