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STLSubmission#: 2003-11-0639 <br /> Volatile Organic Compounds by 82608 (Low 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#2003/11/25-01.06 <br /> LCS 2003/11/25-01.06-002 Extracted: 11/25/2003 Analyzed: 11/25/200312:01 <br /> LCSD 2003/11/25-01.06-014 Extracted: 11/25/2003 Analyzed: 11/25/200318:18 <br /> Compound Conic. ug/Kg Exp.Conc. Recovery% RPD Ctrl.Limits% Flags <br /> LCS LCSD LCS LCSD % Rec. RPD LCS LCSD <br /> Benzene 94.5 97.2 100.0 94.5 97.2 2.8 69-129 20 <br /> Chlorobenzene 101 109 100.0 101.0 109.0 7.6 61-121 20 <br /> 1,1-Dichloroethene 116 110 100.0 116.0 110.0 5.3 65-125 20 <br /> Toluene 91.3 99.8 100.0 91.3 99.8 8.9 70-130 20 <br /> Trichloroethene 87.3 92.1 100.0 87.3 92.1 5.4 74-134 20 <br /> Surrogates(s) <br /> 4-Bromofluorobenzene 603 529 500 120.6 105.8 74-121 <br /> 1,2-Dichloroethane-d4 523 481 500 104.6 96.2 70-121 <br /> Toluene-d8 526 476 500 105.2 95.2 81-117 <br /> Severn Trent Laboratories, Inc. 11/26/2003 15:24 <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 66 of 68 <br />