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A N A L Y T I C A L <br /> LABORATORIES <br /> Certificate of Analysis <br /> Don Light <br /> De] Tech Geotechnical Services Report Issue Date 08/1 I/99 <br /> 10624 Olive Avenue REGF�vFr� <br /> Oakdale, CA 95361 <br /> Submission Number 9907000435 Sample Date 07/09/99 <br /> AUG 2 1 1999 Sample Time : 07:00 <br /> Lab Number 120893 Sample Type LIQUID <br /> Project Number Valle WhIsale <br /> Project Desc. 2nd 7tr. GW Monitoring HUNTEN & ASSOC <br /> Sample Description Trip Blank <br /> BSK LABORATORIES LUFT ANALYSIS <br /> Date Date <br /> Method Analyte Prep. Anal. Result Units PQL Dil DLR <br /> EPA 8015 / Benzene 07/23/99 07/23/99 ND pg/L 0.3 1 0.3 <br /> EPA 8020 <br /> (MODIFIED) <br /> EPA 8015/ Ethylbenzene 07/23/99 07/23/99 ND µg/L 0.3 1 0.3 <br /> EPA 8020 <br /> (MODIFIED) <br /> 08015/ Toluene 07/23/99 07/23/99 ND ug/L 0.3 1 0.3 <br /> EPA 8020 <br /> (MODIFIED) <br /> EPA 8015 1 Xylenes, Total 07/23/99 07/23/99 ND ug/L 0.3 1 0.3 <br /> EPA 8020 <br /> (MODIFIED) <br /> EPA 8015/ Gasoline 07/23/99 07/23/99 ND pg/L 50 1 50 <br /> EPA 8020 <br /> (MODIFIED) <br /> EPA 8015/ Methyl-tert-Butyl 07/23/99 07/23/99 ND ug/L 5 1 5 <br /> EPA 8020 Ether <br /> (MODIFIED) <br /> TPHG Total Petroleum 07/23/99 07/23/99 ND pg/L 50 1 50 <br /> Hydrocarbons as <br /> Gasoline <br /> ND None DetectedPQL Practical Quantitation Limit Conversions: <br /> mg/L Milligrams/Liter — ppm Dil Dilution Factor 1 ppm = 1000 ppb <br /> ug/L Micrograms/Liter — ppb DLR Reportable Detection Limit 1 ppb = 0.001 ppm <br /> mg/kg Milligrams/Kilogram — ppm derived by (PQL x Dil) <br /> Micrograms/Kilogram — ppb Higher limits may result from exceptional sample matrices or interferences <br /> 1414 Stanislaus Street Fresno, CA 93706-1623 0 Phone 559-497-2888, In CA 800-877-8310 Fax 559-485-6935 <br />