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COLUMBIA 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 /> Sample Matrix: Water Date Analyzed: 05/19/2006 <br /> Lab Control Spike Summary <br /> Volatile Organic Compounds <br /> Extraction Method: EPA 5030B Units: ug/L <br /> Analysis Method: 8260B Basis: NA <br /> Level: Low <br /> Extraction Lot: LWG06011( <br /> Lab Control Sample <br /> LWG0601108-3 <br /> Lab Control Spike <br /> %R@C <br /> Analyte Name Result Expected %Rec Limits <br /> Vinyl Acetate 29.4 20.0 147 77-154 <br /> Vinyl Chloride 11.3 10.0 113 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 /> 31 <br /> Printed: 05/23/2006 11.51.1 Q It, f"-_-_:_ <br />