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COLUMBIA ANALYTICAL SERVICES,INC. <br /> QA/QC Report <br /> Client: Shaw Environmental&Infrastructure,Inc Service Request: . L0600771 <br /> Project: North County Landfill,San Joaquin County/791288 Date Extracted: 05/22/2006 <br /> z <br /> Sample Matrix: Water Date Analyzed: 05/22/20 <br /> Matrix Spike/Duplicate Matrix Spike Summary <br /> Volatile Organic Compounds <br /> Sample Name: Batch QC Units: ug/L <br /> Lab Code: L0600775-003 Basis: NA <br /> Extraction Method: EPA 5030B Level: Low <br /> Analysis Method: 8260B Extraction Lot: LWG060 <br /> Batch QCMS Batch QCDMS <br /> LWG0601112-1 LWG0601112-2 <br /> Sample Matrix Spike Duplicate Matrix Spike <br /> %Rec <br /> Analyte Name Result Result Expected %Rec Result Expected. %Rec Limits RPD Lin <br /> 1,1,1-'Trichloroethane(TCA) ND 10.4 10.0 104 10.3 10.0 103 65-146 1 <br /> 1,1-Dichloroethane ND 11.9 10.0 119 11.4 10.0 114 73-131 4 <br /> 1,1-Dichloroethene ND 10.7 10.0 107 10.9 10.0 109 55-151 2 2f <br /> 1,2-Dichloroethane(EDC) ND 12.6 10.0 126 12.3 10.0 123 63-141 2 < <br /> 1,2-Dichloropropane ND 10.9 10.0 109 10.7 10.0 107 73-126 2 it <br /> •1,3,5-Trimethylbenzene ND 8.94 10.0 89 8.81 10.0 88 58-142 1 2'_ <br /> 1,3-Dichlorobenzene ND 10.3 10.0 103 10.1 10.0 101 72-133 2 <br /> Benzene ND 10.3 10.0 103 9.76 10.0 98 71-131 5 5 <br /> Chlorobenzene ND 10.2 10.0 102 10.1 10.0 101 74-129 0 5 <br /> Chloroform ND 10.2 10.0 102 10.3 10.0 103 70-144 1 25 <br /> Ethylbenzene ND 9.94 10.0 99 9.58 10.0 96 73-133 4 <br /> Methyl tert-Butyl Ether ND 20.0 20.0 100 20.9 20.0 104 63-131 4 <br /> Tetrachloroethene(PCE) ND 11.4 10.0 114 11.2 10.0 112 66-139 2 25 <br /> Toluene ND 10.7 10.0 107 10.6 10.0 106 73-132 2 . <br /> Trichloroethene(TCE) ND 11.0 10.0 110 10.6 10.0 106 58-136 4 <br /> Vinyl Chloride ND 11.5 10.0115 11.6 10.0 116 67-147 1 25 <br /> Results flagged with an asterisk(*)indicate values outside control criteria. <br /> Results flagged with a pound(#)Indicate the control criteria is not applicable. <br /> Percent recoveries and relative percent differences(RPD)are determined by the software using values in the calculation which have not been rounded. <br /> 28 <br /> Printed: 05/23/2006 12 51 i V,.....,9 A _ <br />