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C H RO MALAB, INC. Submission #: 1999-10-0144 <br />•' Environmental Services(SDB) <br /> To Wright Environmental Services Inc Test Method 8024_ <br /> 8015M <br /> • Attn Marla Reid Prep Method 5030 <br /> Batch QC Report <br /> Gas/BTEX <br /> Laboratory Control Spike (LCSILCSD) Water QC Batch #1999110/11-0'1.05 <br /> LCS 1999L=11-01 05-002 Extracted 10/11/19991300 Analyzed 10/11/1999 13 00 <br /> LCSD 1999/10/11-01 05-003 Extracted 10/11/19991332 Analyzed 10/11/1999 13 32 <br /> Compound Conc [ug/L] Exp Conc [ug/L I Recovery(%] RPD Ctrl Limits [%] Flags <br /> LCS LCSD LCS T LCSD LCS I LCSD [%] Recovery RPD LCS LCSD <br /> Gasoline 493 502 500 500 986 1004 1 8 75-125 20 <br /> Benzene 112 107 1000 1000 1120 1070 4 6 77-123 20 <br /> Toluene 110 104 1000 1000 1100 1040 5 6 78-122 20 <br /> Ethyl benzene 106 101 1000 1000 1060 1010 48 70-130 20 <br /> Xylene(s) 316 304 300 300 1053 1013 39 75-125 20 <br /> Surrogate(s) <br /> Trifluorotoluene 603 569 500 500 1206 1138 58-124 <br /> 4-Bromofluorobenzene-FI 371 372 500 500 74 2 74 4 50-150 <br /> 1220 Quarry Lane`Pleasanton CA 945664756 <br /> Telephone (925)484-1919'Facsimile (925)484-1096 <br /> Printed on 10/15/1999 17 51 Page 6 of 6 <br />