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PRECISION <br /> ENVIRO-TECH <br /> Analytical Laboratory CERTIFICATE OF ANALYSIS <br /> Wednesday,March 2,2005 <br /> Attention: Francis X. Bean <br /> ' Kleinfelder,Inc. <br /> Report Page 12 oJ21 <br /> 2825 East Myrtle Street <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 AC50116-Volatiles <br /> tBlank(AC50116-BLKI) Prepared&Analyzed:01-Mar-05 <br /> Acetone ND 100 ug/kg <br /> Acetone ND 100 " <br /> tert-Butyl Acohol(TBA) ND 50.0 <br /> Methyl tert-butyl Ether(MtBE) ND 5.00 <br /> Diisopropyl Ether(DIPE) ND 5.00 " <br /> Ethyl tert-Butyl Ether(ETBE) ND 5.00 " <br /> tert-Amyl Methyl Ether(TAME) ND 5.00 <br /> Benzene ND 5.00 <br /> Benzene ND 2.00 " <br /> ' Ethylbenzene ND 5.00 <br /> Bromobenzene ND 2.00 <br /> Toluene ND 5.00 <br /> Bromochloromethane ND 2.00 " <br /> m,p-Xylene ND 5.00 11 <br /> o-Xylene ND 5.00 <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 '1 <br /> Carbon disulfide ND 20.0 <br /> Carbon tetrachloride ND 2.00 " <br /> Chlorobenzene ND 2.00 " <br /> ' Chloroethane ND 2.00 11 <br /> 2-Chloroethylvinyl ether ND 20.0 <br /> Chloroform ND 2.00 " <br /> Chloromethane ND 2.00 f' <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 /> 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 /> i <br /> Jonathan Le,Laboratory Director <br /> 77-1:1 N. YVest Lane. Suite 132 Stockton CA. 95210 phone: (209) 4 8105 P'CIX: (209) 4-7-til F8 <br />