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PRECISION <br /> ENVIRO-TECH <br /> Analytical Laboratory CERTIFICATE OF ANALYSIS <br /> Tuesday,April 19, 2005 <br /> Attention: Doug Heard <br /> Report Page 15 of 17 <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 AD51806-Volatiles <br /> Matrix Spike Dup(AD51806-MSD1) Source:5041812-01 Prepared: 18-Apr-05 Analyzed: 19-Apr-05 <br /> Benzene 80.0 2.00 ug/kg loo ND 80 70-124 12 15 <br /> Chlorobenzene 85.0 2.00 100 ND 85 70-117 6 15 <br /> I,1-Dichloroethene 90.0 2.00 100 ND 90 70-133 12 15 <br /> Toluene 95.0 2.00 100 ND 95 70-122 0 15 <br /> Trichloroethene 90.0 2.00 100 ND 90 70-117 It 15 <br /> Surrogate:Dibromofluoromeihane 235 250 94 86-118 <br /> Surrogate:Toluene-d8 245 250 98 88-110 <br /> Surrogate:4-Bromofluorobenzene 263 250 105 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 /> h'ax: (�O>) � '-8111 <br /> '' 43 N. H`cs1 Lahr . Suite B2 Stockton CA. 95 210 oholne: (209) 47-8105 <br />