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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. Report Page 16 of21 <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 /> Reference(AC50116-SRM1) Prepared&Analyzed:01-Mar-05 <br /> tert-Butyl Acohol(TBA) 220 50.0 ug/kg 200 110 75-120 <br /> Methyl tert-butyl Ether(MtBE) 38.0 5.00 40.0 95 75-120 <br /> ' Diisopropyl Ether(DIPE) 33.0 5.00 11 40.0 82 75-120 <br /> Ethyl tert-Butyl Ether(ETBE) 45.0 5.00 40.0 112 75-120 <br /> tert-Amyl Methyl Ether(TAME) 37.0 5.00 40.0 92 75-120 <br /> Benzene 41.0 5.00 40.0 102 60-120 <br /> Benzene 41.0 2.00 " 40.0 102 60-120 <br /> Ethylbenzene 47.0 5.00 40.0 118 60-120 <br /> Bromobenzene 32.2 2.00 40.0 80 60-120 <br /> Bromochloromethane 27.2 2.00 11 40.0 68 60-120 <br /> Toluene 24.6 5.00 40.0 62 60-120 <br /> m,p-Xylene 55.3 5.00 80.0 69 60-120 <br /> o-Xylene 28.4 5.00 40.0 71 60-120 <br /> Bromodichloromethane 24.1 2.00 " 40.0 60 60-120 <br /> Bromoform 33.0 2.00 40.0 82 60-120 <br /> Bromomethane 32.6 2.00 40.0 82 60-120 <br /> 2-Butanone ND 20.0 40.0 0-120 <br /> ' n-Butylbenzene 30.6 2.00 1j 40.0 76 60-120 <br /> sec-Butylbenzene 27.2 2.00 40.0 68 60-120 <br /> tert-Butylbenzene 27.7 2.00 40.0 69 60-120 <br /> Carbon disulfide 45.0 20.0 40.0 112 0-120 <br /> ' Carbon tetrachloride 40.0 2.00 1„ 40.0 100 60-120 <br /> Chlorobenzene 30.0 2.00 40.0 75 60-120 <br /> Chloroethane 27.4 2.00 40.0 68 60-120 <br /> 2-Chloroethylvinyl ether 44.0 20.0 40.0 110 0-120 <br /> Chloroform 47.0 2.00 40.0 118 60-120 <br /> Chloromethane 45.0 2.00 40.0 112 60-120 <br /> 2-Chlorotoluene 37.0 2.00 40.0 92 60-120 <br /> 4-Chlorotoluene 37.0 2.00 40.0 92 60-120 <br /> Dibromochloromethane 48.0 2.00 11 40.0 120 60-120 <br /> 1,2-Dibromo-3-chloropropane 37.1 2.00 40.0 93 60-120 <br /> 1,2-Dibromoethane(EDB) 37.0 2.00 40.0 92 60-120 <br /> ' Dibromomethane 48.0 2.00 40.0 120 60-120 <br /> mg/L=milligrams per Liter=ppm DLR=Detection Limn!for Purpose of Reporting. <br /> ug/L=micrograms per Liter=ppb Exceptional sample matrices or interferences may <br /> result in higher defection limits. <br /> RESPECTFULLY SUBMITTED, <br /> Jonathan Le,Laboratory Director <br /> 1 <br /> 7-1:1 N. YYest Lane.. Suite B2 Stockton CA. 952.10 vhone: (209) 477-8105 Fax: (209) -177-81 48 <br />