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A N A L Y T I C A L <br /> LABORATORIES <br /> J <br /> Certificate of Analysis <br /> Don Li ht <br /> g ' <br /> Del-Tech Geotechnical Services Preparation Date 09/18/98 <br /> 10624 Olive Avenue Analysis Date 09/18/98 <br /> Oakdale, CA 95361 i Report Issue Date 09/23/98 <br /> Sample Date 09/08/98 <br /> Submission Number 9809000283 i <br /> Lab Number 76896 Sample Time 14:10 <br /> ! Sample Type LIQUID <br /> Project Number <br /> Project Desc. Calif. Welding,Tracy <br /> Sample Description Domestic Well 1, <br /> ii <br /> 524.2, Volatile Organic Compounds by GUMS <br /> �f <br /> Analyte Result Units I PQL Dil DLR <br /> BenzeneND ND µl;/1 j 0.5 1 0.5 <br /> Bromobenzene 0.5 1 0.5 <br /> Bromochloromethane ND µg/1 0.5 1 0.5 <br /> BromodichloromethaneND <br /> 0.5 1 <br /> Bromomethane 0.5 <br /> ND µdl 0.5 1 0.5 <br /> Bromoform ND / 0.5 0.5 1 0.5 <br /> 2-Butanone ND <br /> n-Butylbenzene it 10.0 1 10 <br /> ND µg/14 0.5 1 0.5 <br /> __Butylbenzene ND µg/1 :1 0.5 1 0.5 <br /> (� 3utylbenzene ND /l <br /> Vr4n Disulfide ND µg/l 1.0 1 0'1 <br /> Carbontetrachloride ND µ 0.5 1 0.5 <br /> Chlorobenzene . ND µg/1 i{ 0.5 1 0.5 <br /> I-Chlorobutane ND µg/1 0.5 1 0.5 <br /> Chloroethane ND /1 t 0.5 1 0.5 <br /> Chloroform .ND Ag/1 �i 0.5 1 0.5 <br /> Chloromethane ND µg/1 0.5 1 0.5 <br /> 3-Chloropropene ND µg/1 0.5 1 0.5 <br /> 2-Chlorotoluene ND µg/1 0.5 1 0.5 <br /> 4-Chlorotoluene ND µ-/l 4 0.5 1 0.5 <br /> 1,2-Dibromo-3-chloropropar.:: ND µg/1 '=j 1.0 1 1 <br /> Dibromochloromethane ND µg/l 1 0.5 1 0.5 <br /> 1,2-Dibromoethane ND µg/1 0.5 1 0.5 <br /> Dibromomethane ND µg/1 0.5 1 0.5 <br /> 1,1-Dichloro-2-propanone ND µg/1 jI 10.0 1 10 <br /> 1,2-Dichlorobenzene ND µg/1 0.5 1 0.5 <br /> 1,3-Dichlorobenzene ND µg/I jF 0.5 1 0.5 <br /> 1,4-Dichlorobenzene ND µg/l 0.5 1 0.5 <br /> Dichlorodifluoromethane ND µg/l . 0.5 1 0.5 <br /> 1,1-Dichloroethane ND µg/1 0.5 1RF7071VED.5 <br /> al <br /> 0 C T 14 1998 <br /> ND None Detected PQL Practical Quantitation Limit i Iwr.i Lr..t &OA113q: <br /> mg/L Milligrams/Liter = ppm P Dilution Factor 1 ppm -�-1ttSS00 ppb <br /> µg/L <br /> Micrograms/Liter_= ppb DLR Reportable Detection Limit 1 ppb.= 0.001 ppm <br /> mg/kg Milligrams/Kilogram = ppm derived by(PQL x Dil) { <br /> µg/kg Micrograms/Kilogram = ppb Higher limits may result from exceptional sample matrices or interferences <br /> 1414 Stanislaus Strep Fresno, CA 93706-1623 Phone 209-497-288811 In CA 800-877-8310 ' Fax 209-485-6935 <br />