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SEVERN <br />Gas/BTEX/MTBE by 8260B (U -M) <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 />Laboratory Control Spike Soil QC Batch # 2005/03/26-1A.62 <br />LCS 2005/03/26-1A.62-025 Extracted: 03/26/2005 Analyzed: 03/26/200518:25 <br />LCSD <br />Compound <br />Conc. mg/Kg Exp.Conc. Recovery % RPD Ctrl.Limits % Flags <br />LCS <br />LCSD LCS <br />LCSD % Rec. <br />RPD LCS <br />LCSD <br />Methyl tert-butyl ether (MTBE) <br />0.0476 <br />0.05 95.2 <br />65-165 <br />20 <br />Benzene <br />0.0544 <br />0.05 108.8 <br />69-129 <br />20 <br />Toluene <br />0.0597 <br />0.05 119.4 <br />70-130 <br />20 <br />Surrogates(s) <br />1,2-Dichloroethane-d4 <br />503 <br />500 100.6 <br />76-124 <br />Toluene -d8 <br />532 <br />500 1 106.4 <br />75-116 <br />Severn Trent Laboratories, Inc. <br />STL San Francisco' 1220 Quarry Lane, Pleasanton, CA 94566 <br />A parr of Sevem 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 31 of 39 <br />