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STS. <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 />Batch QC Report <br />Prep(s): 5030B Test(s): 8260B <br />Matrix Spike ( MS / MSD ) <br />MS/MSD <br />MS: 2005/03/25-3A.69-003 <br />MSD: 2005/03/25-3A.69-023 <br />6TON <br />Extracted: 03/25/2005 <br />Extracted: 03/25/2005 <br />QC Batch # 2005/03/25-3A.69 <br />Lab ID: <br />2005-03-0570 - 029 <br />Analyzed: <br />03/25/2005 21:03 <br />Dilution: <br />1.00 <br />Analyzed: <br />03/25/2005 21:23 <br />Dilution: <br />1.00 <br />Compound <br />Conc. mg/Kg <br />Spk.Level <br />Recovery % <br />Limits % <br />Flags <br />MS <br />MSD <br />Sample <br />mg/Kg <br />MS <br />MSD <br />RPD <br />Rec. <br />RPD <br />MS MSD <br />Methyl tert-butyl ether <br />0.0544 <br />0.0536 <br />ND <br />0.05 <br />108.8 <br />107.2 <br />1.5 <br />65-165 <br />20 <br />Benzene <br />0.0533 <br />0.0545 <br />ND <br />0.05 <br />106.6 <br />109.0 <br />2.2 <br />69-129 <br />20 <br />Toluene <br />0.0554 <br />0.0543 <br />ND <br />0.05 <br />110.8 <br />108.6 <br />2.0 <br />70-130 <br />20 <br />Surrogate(s) <br />1,2-Dichloroethane-d4 <br />480 <br />486 <br />500 <br />96.0 <br />97.2 <br />76-124 <br />Toluene -d8 <br />496 <br />500 <br />500 <br />99.2 <br />100.0 <br />1 <br />75-116 <br />Severn Trent Laboratories, Inc. <br />STL San Francisco . 1220 Quarry Lane, Pleasanton, CA 94566 <br />A part of Sevem Trent Plc Tel 925 484 1919 Fax 925 484 1096 ' www.sti-inc.com ' CA DHS ELAP# 2496 <br />03/28/2005 14:57 <br />Page 35 of 39 <br />