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A N A L Y T I C A L <br /> LABORATORIES <br /> Certificate of Analysis <br /> Don Light <br /> Del-Tech Geocechnical Services Report Issue Date 02/23/99 <br /> 10624 Olive Avenue <br /> Oakdale, CA 95361 <br /> Submission Number 9902000201 Sample Date 02/01/99 <br /> Lab Number Sample Time 11:40 <br /> 97545 le <br /> Project Number Sample Type LIQUTD <br /> Project Desc. Valley Wholesale G.W. <br /> Sample Description MW 1 <br /> BSK LABORATORIES LUFf ANALYSIS <br /> Date Date <br /> Method Analyte Prep. Anal. Result Units PQL Dil DLR <br /> EPA 8015 / Benzene 02/14/99 02/14/99 510 ug/L 0.3 40 12 <br /> EPA 8020 <br /> (MOD1FiED) <br /> EPA 8015 / Ethylbenzene 02/14/99 02/14/99 280 ug/L 0.3 40 12 <br /> EPA 3020 <br /> (I� DIFIED) <br /> 015 / Toluene 02/14/99 02/14/99 80 p '/L 0.3 40 12 <br /> EPA 8020 <br /> (MODIFIED) <br /> EPA 8015/ Xylenes, Total 02/14/99 02/14/99 260 ug/L 0.3 40 12 <br /> EPA 8020 <br /> (MODIFIED) <br /> EPA 8015 / Gasoline 02/14/99 02/14/99 2900 ug/I,. 50 40 2000 <br /> EPA 8020 <br /> (MODIFIED) <br /> EPA 8015 / Methyl-tert-Butyl 02/14/99 02/14/99 ND yg/L 5 40 200 <br /> EPA 8020 Ether <br /> (MODIFIED) <br /> RF0,FIVFr) <br /> MAR 1 1 1599 <br /> HUN-4 tH & A6800 <br /> ND None Detected PQL Practical Quantitation Limit <br /> [ Q Conversions: <br /> mg/L Milligrams/Liter = ppm Di Dilution Factor 1 ppm = 1000 ppb <br /> yg/L Micrograms/Liter e ppb DLR Reportable Detection Limit 1 ppb = 0.001 ppm <br /> ma kg Milligrams/Kilogram o 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 - Phone 559-497-2888, In CA 800-877-8310 - Fax 559-485-6935 <br />