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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 11:57 <br /> Lab Number 55152 Sample Type LIQUID <br /> Project Number <br /> Protect Desc. Valley Showcase <br /> Sample Description MW-2 Grab <br /> BSK LABORATORIES LUFT ANALYSIS <br /> Date Datc <br /> Method Analyte Prep. Anal. Result 1 Units PQL Dil DLR <br /> EPA 8015/ Benzene 04/12/98 04/12/98 170 p.g/L 0.3 IO 3 <br /> EPA 8020 <br /> EPA 8015 /' Ethylbenzene 04/12/98 04/12/98 92 ug/L 0.3 4 1.2 <br /> EPA 8020 <br /> EPA 8015/ Toluene 04/12/98 04/12/98 27 yg/L 0.3 4 1.2 <br /> 168020 <br /> 80i5/ Xylenes, Total 04/12/98 04/12/98 230 µg/L 0.3 4 1.2 <br /> EPA 8020 <br /> EPA 8015 / Gasoline 04/12/98 04/12/98 1900 µg/L 50 4 200 <br /> EPA 8020 <br /> ND None Detected PQL Practical Quantitation Limit Conversions: <br /> mg/L Milligrams/Liter — ppm Dil Dilution Factor 1 ppm = 1000 ppb <br /> µg/L Micrograms/Liter <br /> — ppb DLR Reportable Detection Limit 1 ppb = 0.001 ppm <br /> mg/kg Milligrams/Kilogram — ppm derived by (PQL x Dil) <br /> ug/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 BOO-877-8310 4 Fax 209.485-6935 <br />