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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 13 of 16 <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 AD-51911 -Volatiles <br /> Blank(ADS 1911-BLKI) Prepared&Analyzed: 19-Apr-05 <br /> Ethyl tert-Butyl Ether(ETBE) ND 2.00 ug/kg <br /> m,p-Xylene ND 2.00 " <br /> o-Xylene ND 2.00 <br /> tert-Amyl Methyl Ether(TAME) ND 2.00 " <br /> tert-Butyl Acohol(TBA) ND 50.0 <br /> Diisopropyl Ether(DIPE) ND 2.00 " <br /> Surrogate:DibromoJluoromethane 47.1 50.0 94 86-118 <br /> Surrogate:Toluene-d8 48.9 50.0 98 88-110 <br /> Surrogate:4-Bromo luorobenzene 50.0 50.0 100 86-115 <br /> LCS(AD51911-BSI) Prepared&Analyzed: 19-Apr-05 <br /> Benzene 18.0 2.00 ug/kg 20.0 90 88-124 <br /> Chlorobenzene 18.5 2.00 20.0 92 88-117 <br /> 1,1-Dichloroethene 16.4 2.00 20.0 82 79-133 <br /> Toluene 17.8 2.00 20.0 89 88-122 <br /> Trichloroethene 17.4 2.00 20.0 87 85-117 <br /> Surrogate:Dibromojluoromethane 45.8 50.0 92 86-118 <br /> Surrogate:Toluene-d8 48.0 50.0 96 88-110 <br /> Surrogate:4-Bromofluorobenzene 48.6 50.0 97 86-115 <br /> Matrix Spike(AD51911-MSI) Source:5041907-01 Prepared&Analyzed: 19-Apr-05 <br /> Benzene 16.4 2.00 ug/kg 20.0 ND 82 70-124 <br /> Chlorobenzene 17.4 2.00 20.0 ND 87 70-117 <br /> I,I-Dichloroethene 16.7 2.00 20.0 ND 84 70-133 <br /> Toluene 16.4 2.00 20.0 ND 82 70-122 <br /> Trichloroethene 18.4 2.00 20.0 ND 92 70-117 <br /> Surrogate:Dibromo luoromethane 46.6 50.0 93 86-118 <br /> Surrogate:Toluene-& 47.5 50.0 95 88-110 <br /> Surrogate:4-BromoJluorobenzene 50.1 50.0 100 86-115 <br /> mg/L=milligrams per Liter=ppm DLR=Detection Limitfor 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 /> Jonathan Le,Laboratory Director <br /> 77,43 N. ib'est Lane. Suite B2 Stockton CA. 952.10 phone: (209) 477-8105 Fax: (20.9) 477-8148 <br />