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PRECISION <br /> OENVIRO-TECH <br /> ,AnalyticalLaborafory CERTIFICATE OF ANALYSIS <br /> Tuesdav,April 12,2005 <br /> Altenlion: Francis X. Bean <br /> Kleinfelder,Inc. Report Page 35 of 39 <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 AD51110-Volatiles <br /> Blank(AD51110-BLKl) Prepared&Analyzed:11-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 51.4 50.0 103 86-118 <br /> Surrogate:Toluene-d8 51.1 50.0 104 88-110 <br /> Surrogate:4-Bromofluorobenzene 53.0 50.0 106 86-115 <br /> LCS(AD51 1 10-BS1) Prepared&Analyzed: 11-Apr-05 <br /> Benzene 20.0 2.00 ug/kg 20.0 100 88-124 <br /> Chlorobenzene 20.0 2.00 20.0 100 88-117 <br /> 1,1-Dichloroethene 20.1 2.00 20.0 100 79-133 <br /> Toluene 20.0 2.00 20.0 100 88-122 <br /> Trichloroethene 20.0 2.00 20.0 100 85-117 <br /> Surrogate:Dibromofluoromethane 50.0 50.0 100 86-118 <br /> Surrogate:Toluene-d8 50.1 50.0 100 88-110 <br /> Surrogate:4-Bromofluorobenzene 50.0 50.0 100 86-115 <br /> Matrix Spike(AD51110-MS1) Source:5041107-05 Prepared&Analyzed:11-Apr-05 <br /> Benzene 14.2 2.00 ug/kg 20.0 ND 71 70-124 <br /> Chlorobenzene 15.0 2.00 20.0 ND 75 70-117 <br /> 1,1-Dichloroethene 16.2 2.00 20.0 ND 81 70-133 <br /> Toluene 17.0 2.00 20.0 ND 85 70-122 <br /> Trichloroethene 15.0 2.00 20.0 ND 75 70-117 <br /> Surrogate:Dibromofluoromethane 51.9 50.0 104 86-118 <br /> Surrogate:Toluene-d8 49.6 50.0 99 88-110 <br /> Surrogate:4-Bromofluorobenzene 50.4 50.0 101 86-115 <br /> mg L=milligrams per Liter=ppm DLR=Defection Limit for purpose of Reposing. <br /> ug L=micrograms per Liter=ppb Exceptional sample matrices or interferences may <br /> result in higher detection limits. <br /> RESPECTFULLY SUBMITTED, <br /> 1��5/Ow� <br /> Jonathan Le,Laboratory Director <br /> 7743 N. West Lane. Suite B2 Stockton CA. 95210 phone: (209) 47-8105 Fax: (209)4?;'-8148 <br />