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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):82608 <br /> Matrix Spike(MS/MSD) Soil QC Batch#2003/11/25-01.06 <br /> GMX-4-10.0 >> MS Lab ID: 2003-11-0639-031 <br /> MS: 2003/11/25-01.06-018 Extracted: 11/25/2003 Analyzed: 11/25/2003 20:36 <br /> Dilution: 1.00 <br /> MSD: 2003/11/25-01.06-019 Extracted: 11/25/2003 Analyzed: 11/25/2003 21:12 <br /> Dilution: 1.00 <br /> Compound Conic. ug/Kg Spk.Level Recovery% Limits% Flags <br /> MS MSD Sample ug/Kg MS MSD RPD Rec. RPD MS MSD <br /> Benzene 91.2 96.4 ND 100.0 91.2 96.4 5.5 69-129 20 <br /> Chlorobenzene 101 107 ND 100.0 101.0 107.0 5.8 61-121 20 <br /> 1,1-Dichloroethene 101 106 ND 100.0 101.0 106.0 4.8 65-125 20 <br /> Toluene 94.4 99.2 ND 100.0 94.4 99.2 5.0 70-130 20 <br /> Trichloroethene 86.6 90.8 ND 100.0 86.6 90.8 4.7 74-134 20 <br /> Surrogate(s) <br /> 4-Bromofluorobenzene 530 532 500 106.0 106.5 74-121 <br /> 1,2-Dichloroethane-d4 510 508 500 102.0 101.6 70-121 <br /> Toluene-d8 1477 1476 1 1 500 1 95.5 1 95.2 1 1 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 68 of 68 <br />