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COLUMBIA ANALYTICAL SERVICES,INC. <br /> QA/QC Report <br /> Client: Shaw Environmental&Infrastructure,Inc. Service Request: P0700376 <br /> Lroject Name: Corral Hollow Landfill,San Joaquin County Date Collected : 04/16/07 <br /> ct Number: 124592(Ground Water) Date Received : 04/17/07 <br /> le Matrix : WATER Date Extracted : NA <br /> Date Analyzed : 04/17/07 <br /> Matrix Spike/Duplicate Matrix Spike Summary <br /> ample Name : MW-4 Units : mg/L(ppm) <br /> Lab Code: P0700376-OOIMS P0700376-OOIDMS Basis : NA <br /> est Notes <br /> Prep Spike <br /> CAS Relative <br /> sis S ike Level Sam le S ike ResultRecoverY <br /> Acceptance Percent Result <br /> Inalyte Method Method PQL MS DMS Result MS DMS MS DMS Limits Difference Notes <br /> Sulfate None 300.0 0.5 50.0 50.0 414 461 458 94 88 80-120 <1 <br /> 1 <br /> Opproved By Date:140 <br /> port By:RWONG <br />