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40 PRECISION <br /> ENVIRO-TECH <br /> Analytical Laborator y CERTIFICATE OFANAL YSIS <br /> Tuesdav,April 12,2005 <br /> Attention: Francis X. Bean <br /> Kleinfelder,Inc. Report Page 36 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 /> Matrix Spike Dup(AD51110-MSDI) Source:5041107-05 Prepared&Analyzed:11-Apr-05 <br /> Benzene 16.1 2.00 ug/kg 20.0 ND 80 70-124 13 15 <br /> Chlorobenzene 14.3 2.00 20.0 ND 72 70-117 5 15 <br /> 1,1-Dichloroethene 15.9 2.00 20.0 ND 8o 70-133 2 15 <br /> Toluene 16.2 2.00 20.0 ND 81 70-122 5 15 <br /> Trichloroethene 15.2 2.00 20.0 ND 76 70-117 1 15 <br /> Surrogate:Dibromofluoromethane 50.6 50.0 101 86-118 <br /> Surrogate:Toluene-d8 50.1 50.0 100 88-110 <br /> Surrogate:4-Bromofluorobenzene 49.4 50.0 99 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 /> msuh in higher detection limits. <br /> RESPECTFULLY SUBMITTED, <br /> �j/'Ow� <br /> Jonathan Le,Laboratory Director <br /> 7143 N. West Lane. Suite B2 Stockton CA. 95210 nhone: (209) 41'-8105 Fax: (209) 471-8148 <br />