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STL GhromaLab Submission # 2001-040459 <br /> Environmental Services(CA 1094) <br /> To Wright Environmental Services Inc Test Method 8260B <br /> Attn Marla Reid Prep Method 5030E <br /> Batch QC Report <br /> Fuel Oxygenates by 82608 <br /> Laboratory Control Spike (LCS/LCSD) Water QC Batch #2001104/25-01 27 <br /> LCS 2001104125-01 27-002 Extracted 04/25/2001 14 49 Analyzed 04/25/2001 14 49 <br /> LCSD 2001104125-01 27-003 Extracted 04/25/2001 15 30 Analyzed 04/25/2001 15 30 <br /> Compound Conc [ug/L] Exp Conc [ug/L] !Recovery[%]RPD Ctrl Limits(%] I Flags <br /> LCS LCSD LCS LCSD II LCS i LCSD [°/,] Recovery I RPD LCS LCSD <br /> Methyl tart-butyl ether ; 499 490 500 500 9981 9801 1 8 65-165 20 1 <br /> Benzene 1459 48 5 500 500 91 81 9701 55 69-129 20 <br /> Toluene 1 421 44 0 500 Soo 84 2' 8801 4 4 70-130 20 <br /> 1 i <br /> Surroyate(s' <br /> 1 2-Dichloroethane-d4 ; 554 548 500 500 11081 1096 76-114 <br /> i <br /> Toluene-d8 478 512 500 500 95 6, 102 4 88-110 <br /> 1220 Quarry LanePleasanton CA 94566-1756 <br /> Telephone (925)484-1919'Facsimile (925)484-1096 <br /> Printed on 04/301200/ 13 27 Page 36 of 39 <br />