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i <br /> CHROMALAB, INC, Submission P 2000-07-0290 <br /> Environmental Services(SOB) <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 (LCS/LCSD) Water QC Batch##2000107125-01 02 <br /> LCS 2000/07/25-01 02-002 Extracted 07/25/2000 07 39 Analyzed 07/25/2000 07 39 <br /> LCSD 2000107/25-01 02-003 Extracted 07/25/2000 10 04 Analyzed 07/25/2000 10 04 <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 /> Gasoline 540 555 Soo 500 1080 1110 27 75-125 20 <br /> Benzene 883 938 1000 1000 883 938 60 77-123 20 <br /> Toluene 86 0 907 1000 1000 860 907 53 78-122 20 <br /> Ethyl benzene 81 7 654 1000 1000 817 854 44 70-130 20 <br /> Xylene(s) 252 261 300 300 840 870 35 75-125 20 <br /> Surrogates) <br /> Trifluoroto[uene 418 472 500 5o0 836 944 58-124 <br /> 4-Bromofluorobenzene-F] 572 565 500 500 1144 1130 50-150 <br /> 1220 Quarry Lane'Pleasanton CA 94566-4756 <br /> Telephone (925)484-1919'Facsimile (925)484-1096 <br /> Printed on 07/2612000 17 10 Page 7 of 8 <br />