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STL ChromaLab Submissilon # 2001-040530 <br /> Environmental Services(CA 1094) <br /> To Wright Environmental Services Inc Test Method 8260B <br /> Attn Marla Reid Prep Method 5030B <br /> Batch QC Report <br /> Fuel Oxygenates by 82608 <br /> j Laboratory Control Spike (LCSILCSD) Water QC Batch #2001104130-02 27 <br /> LCS 2001104130-02 27-008 Extracted 04/30/2001 14 58 Analyzed 04/30/2001 14 58 <br /> LCSD 2001/04/30-02 27-009 Extracted 04/30/2001 15 27 Analyzed 04/30/2001 15 27 <br /> Compound Conc [ug/L] Exp Cone [ug/L] (Recovery[%] RPO j Ctrl Limits [%] Flags <br /> LCS LCSD LCS I LCSD LCS I LCSD [%] I Recovery RPD LCS LCSD <br /> Methyl Cert-butyl ether 483 45 8 1 500 500 96 61 91 6 1 53 65-165 20 <br /> Surrogate(s) <br /> 1 2-Dichloroethane-d4 ' 509 482 500 500 101 89641 76-114 <br /> Toluene-d8 522 511 i 500 500 1 04 4 102 2� 88-110 <br /> 1220 Quarry Lane Pleasanton CA 94566-4756 <br /> Telephone (925)484-1919"Facsimile (925)484-1096 <br /> Printed on 05/0212001 15 29 Page 13 of 15 <br />