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f� <br /> J <br /> '. -. SUPERIOR ANALYTICAL LABORATORIES, INC. <br /> 825 ARNOLD,STE. 114 • MARTINEZ,CALIFORNIA 94553 •(415) 229.1512 DOHS #319 <br /> DOHS #220 <br /> a . <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. : 81366 DATE RECEIVED: 08/13/90 <br /> CLIENT: Alton Geoscience DATE REPORTED: 08/20/90 <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 /> # Sample Identification Benzene Toluene Benzene Xylenes <br /> 9 AMW-4 0.6 0.7 2.9 4.2 <br /> 10 AMW-3 0.6 4. 1 2.8 21 <br /> ug/L parts per billion (ppb) <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 = 105 95: Duplicate RPD = <2 <br /> Richard Srna, Ph.D. <br /> Laboratory Manager <br /> ----------------------- <br /> OUTSTANDING OUALITY AND SERVICE <br />