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CALIFORNIA LABORATORY SERVICES <br /> Page 26 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 CW00700-EPA 3050B <br /> Blank(CW00700-BLKI) Prepared&Analyzed:02/04/13 <br /> Lead ND 0.25 mg/kg <br /> Arsenic ND 0.10 " <br /> LCS(CW00700-BS1) Prepared&Analyzed:02/04/13 <br /> Lead 4.77 0.25 mg/kg 5.00 95 75-125 <br /> Arsenic 4.52 0.10 " 5.00 90 75-125 <br /> Matrix Spike(CW00700-MS1) Source:CWB0020-13 Prepared&Analyzed:02/04/13 <br /> Lead 35.7 2.5 mg/kg 5.00 30.4 106 75-125 <br /> Arsenic 9.88 1.0 " 5.00 5.39 90 75-125 <br /> Matrix Spike Dup(CW00700-MSDI) Source:CWB0020-13 Prepared&Analyzed:02/04/13 <br /> Lead 36.1 2.5 mg/kg 5.00 30.4 115 75-125 1 30 <br /> Arsenic 10.6 1.0 5.00 5.39 105 75-125 7 30 <br /> Batch CW00702-EPA 3050B <br /> Blank(CW00702-BLKI) Prepared:02/04/13 Analyzed:02/05/13 <br /> Cadmium ND 1.0 mg/kg <br /> Chromium ND 5.0 " <br /> Lead ND 10 " <br /> Nickel ND 10 " <br /> Zinc ND 5.0 " <br /> LCS(CW00702-BS1) Prepared:02/04/13 Analyzed:02/05/13 <br /> Cadmium 23.9 1.0 mg/kg 25.0 96 75-125 <br /> Chromium 27.2 5.0 25.0 109 75-125 <br /> Lead 23.8 10 25.0 95 75-125 <br /> Nickel 24.3 10 25.0 97 75-125 <br /> Zinc 23.2 5.0 25.0 93 75-125 <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 />