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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 /> Matrix Spike(MS/MSD) Soil QC Batch#2003/11/24-01.09 <br /> GMX-23-10.0 >> MS Lab ID: 2003-11-0639-019 <br /> MS: 2003/11/24-01.09-018 Extracted: 11/24/2003 Analyzed: 11/24/2003 19:45 <br /> Dilution: 1.00 <br /> MSD: 2003/11/24-01.09-019 Extracted: 11/24/2003 Analyzed: 11/24/2003 20:11 <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 42.2 42.9 ND 39.68 106.4 107.5 1.0 69-129 20 <br /> Chlorobenzene 44.8 44.5 ND 39.68 112.9 111.5 1.2 61-121 20 <br /> 1,1-Dichloroethene 38.7 38.9 ND 39.68 97.5 97.4 0.1 65-125 20 <br /> Toluene 44.7 45.3 ND 39.68 112.7 113.5 0.7 70-130 20 <br /> Trichloroethene 45.7 47.0 ND 39.68 115.2 117.7 2.1 74-134 20 <br /> Surrogate(s) <br /> 4-Bromofluorobenzene 478 480 500 95.6 96.0 74-121 <br /> 1,2-Dichloroethane-d4 526 558 500 105.2 111.6 70-121 <br /> Toluene-d8 1489 1493 1 1 500 197.8 198.6 1 181-117 <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 67 of 68 <br />