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+ AUG199 <br /> SUPERIOR ANALYTICAL LABORATORIES, INC. <br /> 825 ARNOLD,STE. 114 • MARTINEZ,CALIFORNIA 94553 • (415) 229-1512 DOHS #319 <br /> DOHS #220 <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. : 81248 DATE RECEIVED: 07/24/90 <br /> CLIENT: Alton Geoscience <br /> CLIENT JOB NO. : 30-140 DATE REPORTED: 07/31/90 <br /> ANALYSIS FOR BENZENE, TOLUENE. ETHYL BENZENE & XYLENES <br /> by EPA SW-846 Methods 5030 and 8020 <br /> LAB Concentration( ug/L ) <br /> # <br /> Sample €dentif)cation BEthyl <br /> - Benzene Toluene Benzene Xylenes <br /> 1 MW-1W ND<0.3 ND<0. 3 ND<0.3 ND<0.3 <br /> ug/L - parts ver billion (vvb) <br /> Method Detection Limit in Water: 0.- <br /> s uq/L <br /> QAQC Summary: <br /> Daily Standard run at 20ug/L: RPD = < 15% <br /> MS/MSD Average Recovery = 88 `K: Duplicate RPD <6% <br /> Richard Srna, Ph.D. <br /> !; -- Laboratory Manager <br /> t <br /> I <br /> a <br /> r <br /> -- OUTSTANDING QUALITY AND SEnVICE <br />