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Trace Analysis Laboratory, Inc <br /> Telephone (510) 783-6960 II <br /> 3423 Investment Boulevard, #8 + Hayward California 94545 Facsimile (510) 783-1512 <br /> LOG NUMBER: 3730 <br /> DATE SAMPLED 10/12/93 <br /> DATE RECEIVED 10/14/93 <br /> DATE ANALYZED. 10/15/93 <br />' DATE REPORTED 10/28/93 <br />' CUSTOMER Conoco, Inc. <br /> REQUESTER: Lenard Long of Sunriver Engineering and Construction, Inc <br /> PROJECT: No 93036, Washington Avenue, Stockton <br /> Sample Type" Vapor <br /> I-1 Method Blank <br /> Method and Concen- Reportinq Concen- Reporting <br />' Constituent Units tration Limit tration Limit <br /> Modified DHS Method <br />' Total Petroleum Hydro- <br /> 3 <br /> carbons as Gasoline mg/m2, 100 55 ND 10 <br /> Modified EPA Method 8020 for: <br /> Benzene mq/m3 2 1 0.86 ND 0 10 <br /> Toluene mq/m3 28 0 96 ND 0 10 <br />' Ethylbenzene mq/m3 54 2 3 ND 0 12 <br /> Xylenes mq/m3 490 2.6 ND 0.30 <br /> OC Summary <br />' % Recovery- 99* <br /> RPD- 5 6 <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 DuPu i s <br />' Quality Assurance/Quality Control Manager <br />' Founding Member of the Association of California Testing Laboratories <br />