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STL <br /> GasIBTEX Compounds by 8015M18021 Submission # 2003-01-0350 <br /> Clayton Group Services, Inc <br /> Attn Kyle Helland <br /> 6920 Koll Center Parkway, Suite 216 <br /> Pleasanton, CA 94566 <br /> Phone (925) 426-2687 Fax (925)426-0106 <br /> Project 80-02263 00 200 Received 01/21/2003 16 45 <br /> The Learner Company <br /> Site 2711 Navy Drive, Stockton, CA <br /> Batch QC Report <br /> Prep(s) 5030 Test(s) 8021 B <br /> Laboratory Control Spike Water QC Batch # 2003101122-01 01 <br /> LCS 2003101122-01 01-004 Extracted 01/22/2003 Analyzed 01/22/2003 08 44 <br /> LCSD 2003101122-01 01-005 Extracted 01/22/2003 Analyzed 01/22/2003 09 13 <br /> Compound Conc ug/L Exp Conc Recovery RPD Ctrl Limits% Flags <br /> LCS LCSD LCS LCSD % Rec RPD LCS LCSD <br /> Benzene 107 110 1000 1070 1100 2 8 77-123 20 <br /> Toluene 104 106 1000 1040 1060 1 9 78-122 20 <br /> Ethyl benzene 108 ill 1000 1080 1 11 0 2 7 70-130 20 <br /> Xylene(s) 317 326 300 1057 1087 2 8 75-125 20 <br /> Surrogates(s) <br /> Trifluorotoluene 539 553 1 500 11078 111015 58-124 <br /> r <br /> i <br /> Severn Trent Laboratories, Inc 01/23/2003 12 40 <br /> STL San Francisco' 1220 Quarry Lane Pleasanton CA 94566 <br /> A Pan ol Sa em T<enl Plc Tel 925 484 1919 Fax 925 484 1096'www stlanc cam'CA OHS ELAP#2496 Page 7 of 8 <br />