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SEVERN <br />TRENT <br />Gas/BTEX/MTBE by 8260B (C6 -C12) <br />Cambria Environmental Emeryville <br />Attn.: Aubrey Cool <br />5900 Hollis Street, Ste. A <br />Emeryville, CA 94608 <br />Phone: (510) 420-3336 Fax: (510) 420-9170 <br />Project: 207-1359-001 <br />Shell SAP Number 136143 <br />Submission: 2005-03-0627 <br />Received: 03/18/2005 17:20 <br />Site: 4315 Waterloo Street, Stockton, CA <br />Compound <br />Batch QC Report <br />Flags <br />MS <br />Prep(s): 5030B <br />Sample mg/Kg MS <br />MSD <br />Test(s): 8260B <br />Matrix Spike ( MS / MSD) <br />Soil <br />QC Batch # 2005/03/26-1A.69 <br />MS/MSD <br />0.0458 <br />Lab ID: <br />2005-03-0552 - 018 <br />MS: 2005/03/26-lA.69-033 <br />Extracted: 03/26/2005 <br />Analyzed: <br />03/26/200510:33 <br />Benzene <br />Dilution: <br />1.00 <br />MSD: 2005/03/26-lA.69-052 <br />Extracted: 03/26/2005 <br />Analyzed: <br />03/26/200510:52 <br />Dilution: <br />1.00 <br />Compound <br />Conc. mg/Kg Spk.Level Recovery % Limits % <br />Flags <br />MS <br />MSD <br />Sample mg/Kg MS <br />MSD <br />RPD Rec. <br />RPD <br />MS <br />MSD <br />Methyl tert-butyl ether <br />0.0458 <br />0.0550 <br />ND 0.05 91.6 <br />110.0 <br />18.3 65-165 <br />20 <br />Benzene <br />0.0494 <br />0.0522 <br />ND 0.05 98.8 <br />104.4 <br />5.5 69-129 <br />20 <br />Toluene <br />0.0454 <br />0.0512 <br />ND 0.05 90.8 <br />102.4 <br />12.0 70-130 <br />20 <br />Surrogate(s) <br />1,2-Dichloroethane-d4 <br />484 <br />517 <br />500 96.8 <br />103.4 <br />76-124 <br />Toluene -d8 <br />440 <br />482 <br />1 500 188.0 <br />1 96.4 <br />1 1 75-116 <br />Severn Trent Laboratories, Inc. <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 <br />03/28/2005 14:57 <br />Page 37 of 39 <br />