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A <br /> I� <br /> A N A L YT I C A L <br /> r <br /> LABORATORIES . <br /> Certificate of Analysis <br /> Don Light <br /> Del-Tech Geotechnical Services <br /> G Preparation Date 09/18/98 <br /> 10624 Olive Avenue Analysis Dace 09/18/98 <br /> Oakdale, CA 95361 Report Issue Date 09/23/98 <br /> j Sample Date 09/08/98 i <br /> Submission Number 9809000283Sample Time 14:10 <br /> Lab Number 76896 Sample Type LIQUID <br /> Project Number <br /> Project Desc. Calif.Welding,Tracy <br /> Sample Description Domestic Well <br /> ii <br /> 524.2, Volatile Organic Compounds by GC/MS(Cont) <br /> 1 <br /> Analyte Result Units I PQL Dil DLR <br /> 1,1,2,2-Tetrachloroethane ND µg/1 0.5 1 0.5 <br /> Tetrachloroethylene ND µg 0.5 1 0.5 <br /> Toluene ND /1 0.5 1 0.5 <br /> 1,2,3-Trichlorobenzene ND µdl {' 0.5 1 0.5 <br /> 1,2,4-Trichlorobenzene . ND µg/1 0.5 1 0.5 <br /> 1,1,1-Trichloroethane ND µg/1 { 0.5 1 0.5 <br /> 1,1,2-Trichloroethane ND µg/1 0.5 1 0.5 <br /> Trichloroethylene ND µg/1 0.5 1 0.5 <br /> Trichlorofluoromethane µg/1 ND 0.5 1 0.5 <br /> 1 Trimethylbenzene ND µ9/1 j¢ 0.5 1 0.5 <br /> I rrimethylbenzene ND 0.5 1 0.5 <br /> Vinyl Chloride ND µg/1 0.5 1 0.5 <br /> o-Xylene ND µg/1 0.5 1 0.5 <br /> m,p-Xylenes ND µg/1 i` 0.5 1 0.5 <br /> 1,2,3-Trichloropropane ND µg/L ji 0.5 1 0.5 <br /> Acetone ND Au !f 10.0 1 10 <br /> r <br /> i` <br /> ji <br /> OCT 1 4 1998 <br /> ii <br /> HUN-1 L11 & ASSOC <br /> ND None Detected PQL Practical Quantitation Limit Conversions: <br /> mg/i Milligrams/Liter = ppm Dil Dilution Factor 1 ppm = 1000 ppb <br /> µg Micrograms/Liter = ppb DLR Reportable Detection Limit 1 ppb = 0.001 ppm <br /> mg/kg Milligrams/Kilogram - ppm derived by (PQL x Dil) 11 <br /> dig/kg Micrograms/Kilogram - ppb Higher limits may result from exceptional sample matrices or interferences <br /> {i <br /> 1414 Stanislaus Street Fresno, CA 93706-1623 Phone 209-497-28881! In CA 800-877-8310 Fax 209-485-6935 <br /> I� <br />