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W ANALYTICAL <br /> DRLABORATORIES - <br /> Certificate of Analysis <br /> Ray Kablanow <br /> Geological Technics Inc Report Issue Date 03/15/99 <br /> 2741 River Road <br /> Modesto, CA 95351 <br /> Sample Date 03/03/99 <br /> Submission Number 9903000147 Sample Time 00:00 <br /> Lab Number 101659 Sample Type SOLID <br /> Project Number Cardoza <br /> Project Desc. 290 N.Main,Manteca <br /> Sample Description D-3 <br /> BSK LABORATORIES LUFT ANALYSIS <br /> Date Date <br /> Method Analyte -Prep'- Anal. Result Units PQL Dil DLR <br /> EPA 8015/ Benzene 03/12/99 03/12/99 ND mg/Kg 0.005 2 0.01 <br /> EPA 8020 <br /> (MODIFIED) <br /> EPA 8015/ Ethylbenzene 03/12/99 03/12/99 0.088 mg/Kg 0.005 5 0.025 <br /> EPA 8020 <br /> (MODIFIED) <br /> EPA 8015/ Toluene 03/12/99 03/12/99 ND mg/Kg 0.005 5 0.025 <br /> EPA 8020 <br /> (MODIFIED) <br /> EPA 8015/ Xylenes, Total 03/12/99 03/12/99 0.33 mg/Kg 0.005 5 0.025 <br /> EPA 8020 <br /> (MODIFIED) <br /> EPA 8015/ Gasoline 03/12/99 03/12/99 24 mg/Kg 1 5 5 <br /> EPA 8020 <br /> (MODIFIED) <br /> EPA 8015/ Methyl-tert-Butyl 03/12/99 03/12/99 2.4 mg/Kg 0.05 5 0.25 <br /> EPA 8020 Ether <br /> (MODIFIED) <br /> ND None Detected PQL Practical Quantitation Limit Conversions: <br /> mg/L Milligrams/Liter = ppm Dil Dilution Factor 1 ppm = 1000 ppb <br /> Itg/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 interferences <br /> 1414 Stanislaus Street 0 Fresno, CA 93706-1623 0 Phone 559-497-2888, In CA 800-877-8310 • Fax 559-485-6935 <br />