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r . AUG <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 .0 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 DATE REPORTED: 07/31 /90 <br /> CLIENT JOB NO. : 30-14'0 <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 /> 1 MW-1W ND<0 . 3 ND<0. 3 ND<0 . 3 ND<0 . 3 <br /> ug/L - parts Der billion ( pob) <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 = 88 %: Duplicate RPD = <6% <br /> Richard Srna . Ph . D. <br /> Sant -(;j <br /> Laboratory Manager <br /> OUTSTANDING QUALITY AND SERVICE <br />