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STLSubmission#: 2003-11-0639 <br /> CAM 17 Metals <br /> Geomatrix Consultants <br /> Attn.: Robert Cheung <br /> 2101 Webster Street, 12th Floor <br /> Oakland, CA 94612 <br /> Phone: (510)663-4299 Fax: (510)663-4141 <br /> Project: 7066.001 Received: 11/18/2003 17:50 <br /> Tracy Gravel Pits <br /> Site: 26805 South MacArthur Dr,Tracy,CA,95576 <br /> Batch QC Report <br /> Prep(s): 3050B Test(s): 6010B <br /> Laboratory Control Spike Soil QC Batch#2003/11/20-01.15 <br /> LCS 2003/11/20-01.15-066 Extracted: 11/20/2003 Analyzed: 11/21/200315:41 <br /> LCSD 2003/11/20-01.15-067 Extracted: 11/20/2003 Analyzed: 11/21/200315:46 <br /> Compound Conic. mg/Kg Exp.Conc. Recovery% RPD Ctrl.Limits% Flags <br /> LCS LCSD LCS LCSD % Rec. RPD LCS LCSD <br /> Antimony 89.9 90.0 100.0 89.9 90.0 0.1 80-120 20 <br /> Arsenic 90.2 89.9 100.0 90.2 89.9 0.3 80-120 20 <br /> Barium 97.3 96.9 100.0 97.3 96.9 0.4 80-120 20 <br /> Beryllium 96.8 97.4 100.0 96.8 97.4 0.6 80-120 20 <br /> Cadmium 95.4 95.1 100.0 95.4 95.1 0.3 80-120 20 <br /> Chromium 93.4 93.2 100.0 93.4 93.2 0.2 80-120 20 <br /> Cobalt 97.8 97.5 100.0 97.8 97.5 0.3 80-120 20 <br /> Copper 100 100 100.0 100.0 100.0 0.0 80-120 20 <br /> Lead 92.9 93.0 100.0 92.9 93.0 0.1 80-120 20 <br /> Molybdenum 88.6 88.7 100.0 88.6 88.7 0.1 80-120 20 <br /> Nickel 98.9 97.8 100.0 98.9 97.8 1.1 80-120 20 <br /> Selenium 83.9 83.6 100.0 83.9 83.6 0.4 80-120 20 <br /> Silver 96.8 97.0 100.0 96.8 97.0 0.2 80-120 20 <br /> Thallium 90.2 89.5 100.0 90.2 89.5 0.8 80-120 20 <br /> Vanadium 99.9 99.6 100.0 99.9 99.6 0.3 80-120 20 <br /> Zinc 88.9 88.8 100.0 88.9 88.8 0.1 80-120 20 <br /> Severn Trent Laboratories, Inc. 12/06/2003 14:11 <br /> STL San Francisco*1220 Quarry Lane,Pleasanton,CA 94566 <br /> A part of Severn Trent Plc Tel 925 484 1919 Fax 925 484 1096*www.stl-inc.com*CA DHS ELAP#2496 Page 6 of 7 <br />