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PRECISION <br /> ENVIRO-TECH <br /> Analytical Laboratory CERTIFICATE OF ANALYSIS <br /> Tuesday,April 19,2005 <br /> Attention: Doug Heard <br /> Kleinfelder,Inc. Report Page 14 of 17 <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 AD51806-Volatiles <br /> Blank(AD51806-BLKI) Prepared: 18-Apr-05 Analyzed: 19-Apr-05 <br /> Methyl tert-butyl Ether(MtBE) ND 2.00 ug/kg <br /> m,p-Xylene ND 2.00 <br /> Ethyl tert-Butyl Ether(ETBE) 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:Dibromofluoromethane 50.1 50.0 100 86-118 <br /> Surrogate:Toluene-d8 50.5 50.0 101 88-/10 <br /> Surrogate:4-Bromofluorobenzene 48.0 50.0 96 86-115 <br /> LCS(AD51806-BSI) Prepared: 18-Apr-05 Analyzed: 19-Apr-05 <br /> Benzene 18.2 2.00 ug/kg 20.0 91 88-124 <br /> Chlorobenzene 17.5 2.00 20.0 88 88-117 <br /> 1,1-Dichloroethene 17.8 2.00 20.0 89 79-133 <br /> Toluene 18.0 2.00 20.0 90 88-122 <br /> Trichloroethene 17.8 2.00 20.0 89 85-117 <br /> Surrogate:Dibromofluoromethane 50.6 50.0 101 86-118 <br /> Surrogate:Toluene-d8 49.5 50.0 99 88-110 <br /> Surrogate:4-Bromofluorobenzene 51.4 50.0 103 86-115 <br /> Matrix Spike(AD51806-MSI) Source:5041812-01 Prepared: 18-Apr-05 Analyzed: 19-Apr-05 <br /> Benzene 90.0 2.00 ug/kg 100 ND 90 70-124 <br /> Chlorobenzene 90.0 2.00 100 ND 90 70-117 <br /> 1,1-Dichloroethene 80.0 2.00 100 ND 80 70-133 <br /> Toluene 95.0 2.00 too ND 95 70-122 <br /> Trichloroethene 100 2.00 loo ND 100 70-117 <br /> Surrogate:Dibromofluoromethane <br /> 239 250 96 86-118 <br /> Surrogate:Toluene-d8 248 250 99 88-110 <br /> Surrogate:4-Bromofluorobenzene 267 250 107 86-115 <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 /> Jonathan Le,Laboratory Director <br /> I43 N. 11"est Lane. Suite B2 Stockton C_]. 95210 Rhone: (309) 477-5105 Fal: (309) 4?'- 4��' <br />