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rCOLUMBIA ANALYTICAL SERVICES INC. <br /> QA/QC Report <br /> Client: Shaw Environmental&Infrastructure,Inc Service Request: L0600776 <br /> Project: North County Landfill,San Joaquin County/791288 Date Extracted: 05/19/2006 <br /> i Sample Matrix: Water Date Analyzed: 05/19/2006 <br /> t <br /> Matrix Spike/Duplicate Matrix Spike Summary <br /> Volatile Organic Compounds <br /> Sample Name: Batch QC Units: ug/L <br /> Lab Code: L0600772-001 Basis: NA <br /> Extraction Method: EPA 5030B Level: Low <br /> Analysis Method: 8260B Extraction Lot: LWG0601 is <br /> Batch QCMS Batch QCDMS <br /> ILWG0601108-1 LWG0601108-2 <br /> Sample Matrix Spike . Duplicate Matrix Spike %Rec RF <br /> Analyte Name Result Result Expected %Rec Result Expected %Rec Limits RPD Lin <br /> 1,1,1-Trichloroethane(TCA) ND 48.5 50.0 97 45.9 50.0 92 65-146 5 2' <br /> 1,1-Dichloroethane ND 55.9 50.0 112 54.3 50.0 109 73-131 3 2_ <br /> 1,1-Dichloroethene 5.1 52.5 50.0 95 50.4 50.0 91 55-151 4 2_ <br /> 1,2-Dichloroethane(EDC) ND 61.5 50.0 123 57.5 50.0 115 63-141 7 24 <br /> 1,2-Dichloropropane ND 52.1 50.0 104 53.1 50.0 106 73-126 2 24 <br /> .1,3,5-Trimethylbenzene ND 47.0 50.0 94 45.6 50.0 91 58-142 3 24 <br /> 1,3-Dichlorobenzene ND 54.3 50.0 109 53.1 50.0 106 72-133 2 24 <br /> 1 Benzene ND 47.3 50.0 95 45.2 50.0 90 71-131 5 24 <br /> Chlorobenzene ND 50.5 50.0 101 47.8 50.0 96 74-129 6 25 <br /> Chloroform ND 49.1 50.0 98 48.5 .50.0 97 70-144 1 25 <br /> 1 Ethylbenzene ND 48.9 50.0 98 46.3 50.0 93 73-133 5 25 <br /> Methyl tert-Butyl Ether ND 96.7 100 97 98.8 100 99 63-131 2 25 <br /> Tetrachloroethene(PCE) 11 64.4 50.0 106 64.7 50.0 107 66=139 1 25 <br /> Toluene ND 52.3 50.0 105 50.0 50.0 100 73-132 5 25 <br /> Trichloroethene(TCE) 270 305 50.0 79 # 287 50.0 41 # 58-136 6 25 <br /> Vinyl Chloride ND 53.1 50.0 106 52.9 50.0 106 67-147 0 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 /> 27 <br /> prinfnA• <br />