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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,9557E <br /> Batch QC Report <br /> Prep(s): 6020 Test(s): 6020 <br /> Laboratory Control Spike Soil QC Batch #2003/11/19-10.15 <br /> LCS 2003/11/19-10.15-002 Extracted: 11/19/2003 Analyzed: 12/01/200319:42 <br /> LCSD 2003/11/19-10.15-003 Extracted: 11/19/2003 Analyzed: 12/01/200319:53 <br /> Compound Conc. mg/Kg Exp.Conc. Recovery% RPD Ctrl.Limits% Flags <br /> LCS LCSD LCS LCSD % Rec. RPD LCS LCSD <br /> Antimony 94.3 88.9 100 94.3 88.9 5.9 80-120 20 <br /> Arsenic 92.5 88.1 100 92.5 88.1 4.9 80-120 20 <br /> Barium 94.4 88.9 100 94.4 88.9 6.0 80-120 20 <br /> Beryllium 99.4 95.7 100 99.4 95.7 3.8 80-120 20 <br /> Cadmium 93.7 88.9 100 93.7 88.9 5.3 80-120 20 <br /> Chromium 97.0 92.4 100 97.0 92.4 4.9 80-120 20 <br /> Cobalt 96.5 91.9 100 96.5 91.9 4.9 80-120 20 <br /> Copper 105 99.2 100 105.0 99.2 5.7 80-120 20 <br /> Lead 92.3 86.3 100 92.3 86.3 6.7 80-120 20 <br /> Molybdenum 96.8 91.2 100 96.8 91.2 6.0 80-120 20 <br /> Nickel 94.3 89.9 100 94.3 89.9 4.8 80-120 20 <br /> Selenium 88.7 85.0 100 88.7 85.0 4.3 80-120 20 <br /> Silver 92.9 87.8 100 92.9 87.8 5.6 80-120 20 <br /> Thallium 91.2 86.2 100 91.2 86.2 5.6 80-120 20 <br /> Vanadium 97.3 91.2 100 97.3 91.2 6.5 80-120 20 <br /> Zinc 94.4 86.0 100 94.4 86.0 9.3 80-120 20 <br /> Severn Trent Laboratories, Inc. 12/10/200316:55 <br /> STL San Francisco'1220 Quarry Lane,Pleasanton,CA 94566 <br /> A Part of Severn Trent Pc Tel 925 484 1919 Fax 925 484 1096'www.stl-inc.com`CA DHS ELAP#2496 Page 25 of 28 <br />