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i <br /> SUPERIOR ANALYTICAL LABORATORY, INC. <br /> 1555 BURKE, UNIT I . SAN FRANCISCO, CA 94124 • PHONE (415) 647-2081 <br /> C E R T I F I C A T E O F A N A L Y S I S <br /> LABORATORY NO. : 80662 DATE RECEIVED: 02/16/90 <br /> CLIENT: Alton Geoscience DATE REPORTED: 02/22/90 <br /> CLIENT JOB NO . : 30-140 <br /> ANALYSIS FOR BENZENE , TOLUENE , ETHYL BENZENE & XYLENES <br /> by EPA SW-846 Methods 5030 and 8020 <br /> Concentration( ug/L ) <br /> LAB Ethyl <br /> 4 Sample Identification Benzene Toluene Benzene Xylenes <br /> 1 MW-1 ND<0 . 3 ND<0 . 3 ND<0 . 3 ND<0 . 3 <br /> 2 MW-2 43 0 . 8 0 . 7 1 . 6 <br /> 3 MW-4 370 43 130 98 <br /> 4 MW-5 220 9 . 4 65 150 <br /> 5 MW-6 220 21 330 250 <br /> 6 M- W-8 9 . 4 7 . 3 70 170 <br /> 7 MW-7 ND<0 . 3 ND<0 . 3 ND<0 . 3 ND<0 . 3 <br /> ug/L - parts per billion (ppb) <br /> ug/k' -- parts per billion, (ppb ) <br /> Method Detection Limit in Soil : 3 ug/kg <br /> Method Detection Limit in Water: 0 . 3 ug/L <br /> QAQC Summary : <br /> Daily Standard run at 20ug/L: RPD = < 15% <br /> MS/MSD Average Recovery = 100 %: Duplicate RPD = <1% <br /> Edward _R. %Morales ' <br /> %lam <br /> L' bra^ ry ^Manager <br /> OUTSTANDING QUALITY AND SERVICE <br />