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STLSubmission#: 2003-11-0639 <br /> Volatile Organic Compounds by 8260B (High Level) <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): 5035 Test(s): 8260B <br /> Laboratory Control Spike Soil QC Batch#2003/11/25-02.06 <br /> LCS 2003/11/25-02.06-011 Extracted: 11/25/2003 Analyzed: 11/25/200316:38 <br /> LCSD 2003/11/25-02.06-012 Extracted: 11/25/2003 Analyzed: 11/25/200317:08 <br /> Compound Conic. ug/Kg Exp.Conc. Recovery% RPD Ctrl.Limits% Flags <br /> LCS LCSD LCS LCSD % Rec. RPD LCS LCSD <br /> Benzene 9880 10400 10000 98.8 104.0 5.1 69-129 20 <br /> Chlorobenzene 11600 12000 10000 116.0 120.0 3.4 61-121 20 <br /> 1,1-Dichloroethene 11000 11400 10000 110.0 114.0 3.6 65-125 20 <br /> Toluene 9990 10400 10000 99.9 104.0 4.0 70-130 20 <br /> Trichloroethene 9440 9710 10000 94.4 97.1 2.8 74-134 20 <br /> Surrogates(s) <br /> 4-Bromofluorobenzene 249 290 250 99.6 116.0 74-121 <br /> 1,2-Dichloroethane-d4 245 279 250 98.0 111.6 70-121 <br /> Toluene-d8 220 258 250 88.0 103.2 81-117 <br /> Severn Trent Laboratories, Inc. 11/26/2003 17:08 <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 14 of 14 <br />