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C H ROMALAB, INC. Submission # 1999-10-0143 <br /> Environmental Services (SDB) <br /> To Wright Environmental Services Inc Test Method 8020 <br /> 8015M <br /> Attn Marla Reid Prep Method 5030 <br /> Batch QC Report <br /> Gas/BTEX <br /> Laboratory Control Spike(LCSILCSD) Water QC Batch # 1999110112-01.05 <br /> LCS 1999110112-01 05-002 Extracted 10/12/1999 08 34 Analyzed 10/12/1999 08 34 <br /> LCSD 1999110112-01 05-003 Extracted 10/12119990906 Analyzed 10/12/1999 09 06 <br /> Compound Conc [ug/L] Exp Conc [ug/L] Recovery[%]j RPD Ctrl Limits [%] Flags <br /> LCS LCSD LCS I LCSD LCS LCSD [%] Recovery I RPD LCS LCSD <br /> Gasoline 503 500 500 500 1006 1000 06 75-125 20 <br /> Benzene 103 101 1000 1000 1030 1010 2 0 77-123 20 <br /> Toluene 102 979 1000 1000 1020 979 41 78-122 20 <br /> Ethyl benzene 996 966 1000 1000 996 966 31 70-130 20 <br /> Xylene(s) 302 291 300 300 1007 970 37 75-125 20 <br /> Surrogate(s) <br /> Trifiuorotoluene 575 573 500 500 1150 114 6 58-124 <br /> 4-Bromofluorobenzene-FI 331 345 500 500 66 2 69 0 50-150 <br /> 1220 Quarry Lane'Pleasanton,CA 94566-4756 <br /> Telephone (925)484-1919"Facsimile (925)484-1096 <br /> Printed on 10/15/1999 17 53 <br /> Page 13 of 15 <br />