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PRECISI01\0 <br /> ENVIRO-TECH <br /> ' Analytical Laboratory CERTIFICATE OFANALYSIS <br /> Tuesday,July 12, 2005 <br /> Attention: Doug Heard <br /> Report Page 100 of 103 <br /> Kleinfelder, Inc. <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 AG50802-Volatiles <br /> LCS(AG50802-BSI) Prepared&Analyzed:08-Jul-05 <br /> Chlorobenzene 17.5 2.00 ug/kg 20.0 88 88-117 <br /> 1,1-Dichloroethene 16.4 2.00 20.0 82 79-133 <br /> Toluene 18.2 2.00 20.0 91 88-122 <br /> ' Trichloroethene 19.1 2.00 20.0 96 85-117 <br /> Surrogate:Dibromofluoromethane 50.2 i% 50.0 100 86-118 <br /> Surrogate:Toluene-d8 50.0 50.0 100 88-110 <br /> Surrogate:4-Bromofluorobenzene 50.6 50.0 101 86-115 <br /> Matrix Spike(AG50802-MS1) Source:5070608-02 Prepared&Analyzed:08-Jul-05 <br /> tert-Butyl Acohol(TBA) 88.0 50.0 ug/kg 100 88 75-125 <br /> Methyl tert-butyl Ether(MtBE) 36.0 5.00 i; 40.0 90 75-125 <br /> Diisopropyl Ether(RIPE) 17.8 5.00 20.0 89 75-125 <br /> Ethyl tert-Butyl Ether(ETBE) 15.6 5.00 20.0 78 75-125 <br /> ' tert-Amyl Methyl Ether(TAME) 11.0 5.00 20.0 55 75-125 <br /> Benzene 16.0 2.00 20.0 ND 80 60-124 <br /> Benzene 16.2 5.00 20.0 81 75-125 <br /> Ethylbenzene 16.4 5.00 20.0 82 75-125 <br /> Toluene 16.6 5.00 20.0 83 75-125 <br /> m,p-Xylene 31.0 5.00 40.0 78 75-125 <br /> o-Xylene 17.0 5.00 20.0 85 75-125 <br /> Chlorobenzene 16.1 2.00 20.0 ND 80 60-117 <br /> 1,1-Dichloroethene 15.2 2.00 20.0 ND 76 70-133 <br /> Toluene 15.4 2.00 20.0 ND 77 65-122 <br /> Trichloroethene 18.0 2.00 20.0 ND 90 65-117 <br /> ' Surrogate:Dibromofluoromethane 51.9 50.0 104 86-118 <br /> Surrogate: Toluene-d8 48.4 50.0 97 88-110 <br /> Surrogate:4-Bromofluorobenzene 50.0 50.0 100 86-115 <br /> 91L= illigrams 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 /> tJonathan Le,Laboratory Director <br /> 7743 N. West Lane . Suite B2 Stockton CA. 95210 phone: (209) 477-8105 Fax: (209) 477-8148 <br />