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SUPERIOR ANALYTICAL LABORATORY, INC. <br /> 1555 BURKE, UNIT I - SAN FRANCISCO, CA 94124 ' PHONE (415) 647-2081 <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. : 51962 DATE RECEIVED: 04/24/90 <br /> CLIENT : Alton Geoscience DATE REPORTED: 05/02/90 <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/kg ) <br /> # Sample Identification Gasoline Range <br /> 1 P1 -4 ' ND< 1 <br /> 3 P2-5 ' 3* <br /> E mg/kg - parts per million (ppm) <br /> Minimum Detection Limit for Gasoline in Soil : 1mg/kg <br /> QAQC Summary: <br /> Daily Standard run at 2mg/L : RPD Gasoline = < 15% <br /> MS/MSD Average Recovery = 81%: Duplicate RPD = 1% <br /> Comments : *Hydrocarbons contributing to total concentration due not <br /> match typical gasoline pattern. <br /> Richard Srna, Ph . D. <br /> aboratory Direct r' <br /> IN QUALITY AND SERVICE <br /> OUTSTAND G Q � <br />