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CHROMALAB INC. <br /> Submission # 1999-08-0176 <br />' Environmental Services (SDB) <br /> To Aqua Science Engineers, Inc Test Method 8260A <br /> Attn Ian T Reed Prep Method 5030 <br /> Batch QC Report <br /> Volatile Organic Compounds <br />' �Laborato Control Spike (LCS/LCSD) Water QC Batch # 1999108113-01 27 <br /> rY P � ) <br />' LCS 1999/08/13-01 27-002 Extracted 08/13/1999 15 38 Analyzed 08/13/1999 15 38 <br /> LCSD 1999108113-01 27-003 Extracted 08/13/1999 16 28 Analyzed 08/13/1999 16 28 <br />' Compound Conc [ug/L] Exp Conc [ug/L] Recovery[%] RPD Ctrl Limits (%] Flags <br /> LCS LCSD LCS LCSD LCS LCSD [%] Recovery RPD LCS !LCSD <br /> I Benzene 49 2 470 500 500 984 94 0 4 6 69-129 20 <br />' Chlorobenzene 501 538 50 0 500 1002 1076 71 61-121 20 I <br /> I 1-Dichloroethene 446 447 500 500 892 894 0 2 65-125 20 <br /> Toluene 461 454 500 500 922 908 1 5 70 130 20 <br /> Trichloroethene 434 437 500 500 8681 87 4 0 7 74 134 20 <br /> Surrogate(s) I <br /> 4-Bromofluorobenzene 532 550 500 500 10e4 1100 86 115 <br /> 1,2-Dichloroethane-d4 449 421 500 500 8981 84 2 76-114 <br />' Toluene-d8 459 452 mm 500 500 - - 91 8 90 4 88 110 <br /> 1220 Quarry Lane`Pleasanton CA 94566-4756 <br /> Telephone (925)484-1919'Facsimile (925)484-1096 <br /> Printed on 08/24/1999 15 48 Page 14 of 16 <br />