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COLUMBIA ANALYTICAL SERVICES,INC. <br /> QA/QC Report <br /> Client: Shaw Environmental&Infrastructure,Inc <br /> Project: North County Landfill,San Joaquin County/791288 Service Request: L06007 <br /> Sample Matrix: Water Date Extracted: 05/22/2006 <br /> Date Analyzed: 05/22/20 <br /> Lab Control Spike Summary <br /> Volatile Organic Compounds <br /> Extraction Method: EPA 5030B <br /> Analysis Method: 8260B Units: ug/L <br /> Basis: NA <br /> Level: Low <br /> Extraction Lot: LWG060 <br /> Lab Control.Sample <br /> LWG0601112-3 <br /> Lab Control Spike <br /> %Ret <br /> Analyte Name Result Expected %Rec Limits <br /> Vinyl Acetate 29.7 20.0 149 77-154 <br /> Vinyl Chloride 10.7 10.0 107 68-134 <br /> Results flagged with an asterisk(*)indicate values outside control criteria. <br /> Percent recoveries and relative percent differences(RPD)are determined by the software using values in the calculation which have not been rounded. <br /> 34 <br /> Printed: 05/23/2006 13:51:22 Fnrm';r-or„a„i,. _ - <br />