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CALIFORNIA LABORATORY SERVICES <br /> Page 27 of 31 02/08/13 12:06 <br /> Tetra Tech Geo Project: VOP-TRACY <br /> 2969 Prospect Park Drive,Suite 100 Project Number: 117-7059009 CLS Work Order#:CWB0016 <br /> Rancho Cordova,CA 95670 Project Manager: Tim Costello COC#:2 COCs <br /> Metals by EPA 6000/7000 Series Methods - Quality Control <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch CW00702-EPA 3050B <br /> Matrix Spike(CW00702-MSI) Source:CWB0020-13 Prepared:02/04/13 Analyzed:02/05/13 <br /> Cadmium 23.9 1.0 mg/kg 25.0 0.860 92 75-125 <br /> Chromium 108 5.0 25.0 83.2 101 75-125 <br /> Lead 47.7 10 25.0 252 NR 75-125 QM-4X <br /> Nickel 112 10 25.0 102 39 75-125 QM-5 <br /> Zinc 103 5.0 25.0 65.2 152 75-125 QM-5 <br /> Matrix Spike Dup(CW00702-MSD1) Source:CWB0020-13 Prepared:02/04/13 Analyzed:02/05/13 <br /> Cadmium 24.9 1.0 mg/kg 25.0 0.860 96 75-125 4 30 <br /> Chromium 128 5.0 25.0 83.2 180 75-125 17 30 QM-5 <br /> Lead 51.8 10 25.0 252 NR 75-125 8 30 QM-4X <br /> Nickel 127 10 25.0 102 100 75-125 13 30 <br /> Zinc 101 5.0 25.0 65.2 141 75-125 3 30 QM-5 <br /> CA DOHS ELAP Accreditation/Registration Number 1233 <br /> 3249 Fitzgerald Road Rancho Cordova,CA 95742 www.californialab.com 916-638-7301 Fax: 916-638-4510 <br />