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1' <br /> Submission #' 2001-04-0530STL ChromaLab <br /> Environmental Services(CA 1094) <br /> To Wright Environmental Services Inc Test Method 8020 <br /> Attn Maria Reid Prep Method 5030 <br /> Batch QC Report <br /> Gas/BTEX <br /> Laboratory Control Spike (LCS/LCSD) Water QC Batch #2001/04/26-01 03 <br /> LCS 2001/04/26-0103-006 Extracted 04/26/2001 11 00 Analyzed 04/26/2001 11 00 <br /> LCSD 2001/04/26-0103-007 Extracted 04126/20011131 Analyzed 04/26/2001 11 31 <br /> Compound Conc [ug/L] Exp Conc [ug]L] Recovery[%]I RPD Ctrl Limits[%] I Flags <br /> LCS LCSD LCS LCSD LCS LCSD I [%] Recovery RPD LCS LCSD <br /> Benzene 103 105 1000 1000 1030 1050 1 9 77-123 20 <br /> Toluene 102 104 1000 1000 1020 1040 1 9 78-122 20 <br /> Ethyl benzene 101 104 1000 1000 1010 1040 2 9 70-130 20 <br /> Xylene(s) - 300 307 300 300 1000 1023 2 3 75-125 20 <br /> Surrogate(s) <br /> 4-BromoFluorobenzene 531 540 500 500 1062 1080 50-150 <br /> Trifluorotoluene 567 584 500 500 1134 1168 58-124 <br /> 1220 Quarry Lane'Pleasanton,CA 94566-4756 <br /> Telephone (925)484-1919'Facsimile (925)484-1096 <br /> Printed on 05102!2001 16 51 Page 15 of 19 <br />