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A N A L Y T I C A L <br /> ' LABORATORIES <br /> Certificate of Analysis <br /> Don Li ht <br /> Del-Tec Geotechnical Services Report Issue Date 04/15/98 <br /> 10624 Olive Avenue <br /> Oakdale, CA 95361 <br /> Sample Date 04/01/98 <br /> Submission Number 9804000072 Sample Time 11:07 <br /> Lab Number 55150 Sample Type LIQUID <br /> Project Number <br /> Project Desc, Valley Showcase <br /> Sample Description MW-4 Grab <br /> BSK LABORATORIES LUFT ANALYSIS <br /> Date Date <br /> Method Analyte Prep. Anal. Result Units PQL Dil DLR <br /> EPA 80I5 / Benzene 04/12/98 04/12/98 ND µg/L 0.3 1 0.3 <br /> EPA 8020 <br /> EPA 8015 / Ethylbenzene 04/12/98 04/12/98 ND µg/L 0.3 1 0.3 <br /> EPA 8020 <br /> EPA 8015 / ToIuene 04/12/98 04/12/98 ND µg/L 0.3 1 0.3 <br /> 68020 <br /> 8015 / Xylenes, Total 04/12/98 04/12/98 ND ug/L 0.3 1 0.3 <br /> EPA 8020 <br /> EPA 8015/ Gasoline 04/12/98 04/12/98 ND µg/L 50 1 50 <br /> FPA 8020 <br /> I`ID None Detected PQ L : Practical Quantitation Limit Conversions; <br /> mg/L Milligrams/Liter - ppm Dil Dilution Factor 1 ppm = 1000 ppb <br /> µg/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 /> µ kg Micrograms/Kilogram — ppb Higher limits may result from exceptional sample matrices or interferences <br /> 1414 Stanislaus Street Fresno, CA 93706 Phone 209-497-2888, In CA 800-877-8310 • Fax 209-485-6935 <br />