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MAY 2 0 1991 <br /> 1 SUPERIOR ANALYTICAL LABORATORIES, INC. , <br /> 825 ARNOLD. STE. 114 • MARTINEZ.CALIFORNIA 94553 •(415) 229-1512 OOHS #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. : 83059 DATE RECEIVED: 05/08/91 <br /> CLIENT- Alton Geoscience DATE REPORTED: 05/15/91 <br /> . <br /> CLIENTJOB NO. : 30-136-01 <br /> ANALYSIS FOR TOTAL. PETROLEUM HYDROCARBONS <br /> by Modified EPA SW_846 Method 5030 and 8015 <br /> LAB Concentration (mg/L) <br /> # Sample Identification Gasoline Range <br /> - <br /> 1 AW-1 ND<0.05 <br /> AW-2 ND<0.05 <br /> 3 AW-3 0.21* <br /> T 4 AW-4 ND<0.05 <br /> - 5 AW-5 ND<0.05 <br /> 6 AW-6 ND<0.05 <br /> 7 ND<0.05 <br /> AW-7 <br /> _-. 8 AW-8 ND<0.05 <br /> mg/L - parts per million (ppm) <br /> * DOES NOT MATCH TYPICAL GASOLINE PATTERN. <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 =96 S6: Duplicate RPD = 9 <br /> Richard Srna, Ph.D. * <br /> + borat y Mana r <br /> ria <br /> OUTSTANDING QUALITY AND SERVICE <br />