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PRECISION <br /> ENVIRO-TECH <br /> Analytical Laboratory CERTIFICATE OF ANALYSIS <br /> Wednesday,April 20,2005 <br /> Attention: Doug Heard <br /> Kleinfelder,Inc. Report Page 21 of 26 <br /> 2825 Myrtle St. <br /> Stockton, CA 95205 <br /> Volatile Organic Compounds by EPA Method 8260B-Quality Control . <br /> Precision Enviro-Tech <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch AD51911-Volatiles <br /> Blank(AD51911-BLKI) Prepared&Analyzed: 19-Apr-05 <br /> Acetone ND 100 ug/kg <br /> Benzene ND 2.00 " <br /> Bromobenzene ND 2.00 " <br /> Bromochloromethane ND 2.00 " <br /> Bromodichloromethane ND 2.00 " <br /> Bromoform ND 2.00 " <br /> Bromomethane ND 2.00 " <br /> 2-Butanone ND 20.0 " <br /> n-Butylbenzene ND 2.00 " <br /> sec-Butylbenzene ND 2.00 " <br /> tert-Butylbenzene ND 2.00 " <br /> Carbon disulfide ND 20.0 " <br /> Carbon tetrachloride ND 2.00 " <br /> Chlorobenzene ND 2.00 " <br /> Chloroethane ND 2.00 " <br /> 2-Chloroethylvinyl ether ND 20.0 " <br /> Chloroform ND 2.00 " <br /> Chloromethane ND 2.00 " <br /> 2-Chlorotoluene ND 2.00 " <br /> 4-Chlorotoluene ND 2.00 " <br /> Dibromochloromethane ND 2.00 " <br /> 1,2-Dibromo-3-chloropropane ND 2.00 " <br /> 1,2-Dibromoethane(EDB) ND 2.00 " <br /> Dibromomethane ND 2.00 " <br /> 1,2-Dichlorobenzene ND 2.00 " <br /> 1,3-Dichlorobenzene ND 2.00 " <br /> 1,4-Dichlorobenzene ND 2.00 " <br /> Dichlorodifluoromethane ND 2.00 " <br /> 1,1-Dichloroethane ND 2.00 " <br /> 1,2-Dichloroethane ND 2.00 " <br /> I,I-Dichloroethene ND 2.00 " <br /> cis-1,2-Dichloroethene ND 2.00 " <br /> trans-1,2-Dichloroethene ND 2.00 " <br /> mg/l,=milligrams per Liter=ppm DLR=Detection Limit for Purpose of Reporting. <br /> ug/L=micrograms per Liter=ppb Exceptional sample matrices or interferences may <br /> result in higher detection limits. <br /> RESPECTFULLY SUBMITTED, <br /> �j/OL'r� <br /> Jonathan Le,Laboratory Director <br /> �I t3 N. West Lane ane . Suite B2 Stocktoii C_1. 95 210 nhoue: ('20.9) 47-8105 Fwv. (209) 4 -81 db' <br />