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i <br /> SUPERIOR ANALYTICAL LABORATORIES, INC. <br /> 825 ARNOLD,STE. 114 • MARTINEZ, CALIFORNIA 94553 • (415) 229-1512 DOHS #319 <br /> C E R T I F I C A T E O F A N A L Y S I S DOHS #220 <br /> LABORATORY NO. : 81171 DATE RECEIVED: 07/13/90 <br /> CLIENT: Alton Geoscience DATE REPORTED: 07/21 /90 <br /> CLIENT JOB NO. : 30-140 <br /> ANALYSIS FOR TOTAL PETROLEUM HYDROCARBONS <br /> by Modified EPA 'SW-846 Method 5030 and 8015 <br /> LAB Concentration (mg/L ) <br /> 0 Sample Identification Gasoline Range <br /> 1 MW-2W 0.08 <br /> 2 MW-4W 3 . 1 <br /> 3 MW-5W 4. 4 <br /> 4 MW-6W 14 <br /> 5 MW-7W ND<0.05 <br /> 6 MW-8W 11 <br /> 7 P=1'W 0.07 <br /> 8 P-2W ND<0.05 <br /> mg/L - parts per million (ppm) <br /> Method Detection Limit for Gasoline in Water : 0. 05 mg/L <br /> QAQC Summary: <br /> Daily Standard run at 2mg/L: RPD Gasoline = 15% <br /> MS/MSD Average Recovery = 107%: Duplicate RPD = 7% <br /> / Richar Srna, Ph .D. <br /> Laboratory Manager <br /> OUTSTANDING QUALITY AND SERVICE <br />