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COLUMBIA ANALYTICAL SERVICES, INC. <br />Qi/QC Report <br />Client: Shaw Environmental & Infrastructure, Inc <br />Project: Foothill Landfill, San Joaquin County (New Wells)/124591 <br />Sample Matrix: Water <br />Extraction Method: EPA 3520C <br />Analysis Method: 8270C <br />Analyte Name <br />Lab Control Spike/Duplicate Lab Control Spike Summary <br />Semi -Volatile Organic Compounds by GC/MS <br />Lab Control Sample <br />K WG0708458-4 <br />Lab Control Spike <br />Result Expected %Rec <br />Duplicate Lab Control Sample <br />K WG0708458-5 <br />Duplicate Lab Control Spike <br />Result Expected %Rec <br />Service Request: <br />P0700704 <br />Date Extracted: <br />08/06/2007 <br />Date Analyzed: <br />08/16/2007 - <br />Extraction Lot: <br />08/28/2007 <br />Units: <br />ug/L. <br />Basis: <br />NA <br />Level: <br />Low <br />Extraction Lot: <br />KWG0708458 <br />%Rec RPD <br />Limits RPD Limit <br />3-Methylcholanthrene 73.4 100 73 95.3 100 95 68-126 26 30 <br />Results Ragged with an asterisk (1) indicate values outside control criteria. <br />Percent recoveries and relative percent d lferences (RPD) are determined by the software using values in the calculation which have not been rounded. <br />111 <br />Printed: 08/30/2007 14:43:06 Dorm 3C - Organic Page 2 of 2 <br />u:\Stealtb\Crystal.rpt\Fonn3DLC.rpt SuperSet Reference: RR76030 <br />