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COLUMBIA ANALYTICAL SERVICES,INC. <br /> • QA/QC Report <br /> Client: Shaw Environmental&Infrastructure,Inc Service Request: L0600154 <br /> Protect: North County Landfill,San Joaquin County/791288(Ground Water) Date Extracted: 02/01/2006 <br /> Sample Matrix: Water Date Analyzed: 02/01/2006 <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: LWG0600419 <br /> Lab Control Sample <br /> LWG0600419-3 <br /> Lab Control Spike <br /> %Rec <br /> Analyte Name Result Expected %Rec Limits <br /> Vinyl Acetate 30.1 20.0 150 77-154 <br /> Vinyl Chloride 9.36 10.0 94 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 usingly in the calculation which have not been rounded. <br /> Printed: 02/02/2006 15:09:29 Form 3C-Oronnic D.,..e <br />