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f <br /> A N A L Y T Z C A -L <br /> LABORATORIES <br /> ti <br /> Certificate of Analysis <br /> Don Light <br /> Del-Tech Geotechnical Services Report Issue Date 03/30/99 . <br /> 10624 Olive Avenue i <br /> Oakdale, CA 95361 <br /> Sample Date 02/11/99 ; <br /> Submission Number 9902000483 Sample Time 17:30 E <br /> Lab Number 98892 Sample Type LIQUID 1 <br /> Project Number Disco <br /> Project Desc. Ground Water Monitoring ' <br /> Sample Description NP-1-80' <br /> BSK LABORATORIES LUFT ANALYSIS <br /> Date Date I <br /> Method Analyte Prep. Anal. Result Units PQL Dil DLR <br /> EPA 8015/ Benzene 02/23/99 02/23/99 14000 pg/L 0.3 2000 606 <br /> EPA 8020 <br /> (MODIFIED) <br /> EPA 8015/ Ethylbenzene 02/23/99 02/23/99 2500 µg/L 0.3 200 60} <br /> EPA 8020 <br /> (MODIFIED) <br /> EPA 8015/ Toluene 02/23/99 02/23/99 26000 pg/L 0.3 2000 6nn� <br /> EPA 8020 <br /> (MODIFIED) <br /> EPA 8015/ Xylenes,Total 02/23/99 02/23/99 15000 µg/L 0.3 200 60i <br /> EPA 8020 <br /> (MODIFIED) <br /> EPA 8015/ Gasoline 02/23/99 02/23/99 140000 jag/L 50 200 100001 <br /> EPA 8020 <br /> (MODIFIED) <br /> EPA 8015/ Methyl-tert-Butyl 02/23/99 02/23/99 ND µg/L 5 200 1000 <br /> EPA 8020 Ether <br /> (MODIFIED) <br /> • +I <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 — ppb DLR : Reportable Detection Limit 1 ppb = 0.001 ppm <br /> mg/kg Milligrams/Kilogram - ppm derived by(PQL x Dil) <br /> pg/kg Micrograms/Kilogram — ppb Higher limits may result from exceptional sample matrices or intcrferencest <br /> 1414 Stanislaus Street + Fresno, CA 93706-1623 Phone 559-497-2888, In CA 800-877-8310 • Fax 559-485-6935 <br />