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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 /> Method Blank Soil QC Batch#2003/11/25-02.06 <br /> MB:2003/11/25-02.06-013 Date Extracted: 11/25/2003 17:41 <br /> Compound Conc. RL Unit Analyzed Flag <br /> 1,3,5-Tri methyl benzene ND 250 ug/Kg 11/25/200317:41 <br /> 2-Chlorotoluene ND 250 ug/Kg 11/25/200317:41 <br /> 4-Chlorotoluene ND 250 ug/Kg 11/25/200317:41 <br /> n-Butylbenzene ND 250 ug/Kg 11/25/200317:41 <br /> n-Propylbenzene ND 250 ug/Kg 11/25/200317:41 <br /> p-Isopropyltoluene ND 250 ug/Kg 11/25/200317:41 <br /> sec-Butylbenzene ND 250 ug/Kg 11/25/200317:41 <br /> tert-B utyl benzene ND 250 ug/Kg 11/25/200317:41 <br /> Surrogates(s) <br /> 4-Bromofluorobenzene 91.8 74-121 % 11/25/200317:41 <br /> 1,2-Dichloroethane-d4 95.6 70-121 % 11/25/200317:41 <br /> Toluene-d8 85.1 81-117 % 11/25/200317:41 <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 13 of 14 <br />