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GAS CHROMATOGRAPHY - QUALITY CONTROL <br /> BLANK SPIKE <br /> Page 10 <br /> Test MOD EPA 8015-CDOHS (FUEL HYDROCARBONS/BTXE) ATI I.D. 510035 <br /> Blank Spike #: 59394 Date Extracted: N/A <br /> Client : ALISTO ENGINEERING Date Analyzed : 11-OCT-95 <br /> Project # : G620563/10-085-09-001 Sample Matrix : WATER <br /> Project Name : BP SITE#11194/2375 TRACY BLVD TRACY CA <br /> ---------------------------------------------- ------------------------------------------- <br /> Parameters <br /> ___--_________-_________..-------_...__..._____Parameters Units Blank Spiked Spike $ <br /> Result Sample Conc. Rec <br /> BENZENE UG/L <0.50 4.9 5.0 98 <br /> TOLUENE UG/L <0.50 5.0 5.0 100 <br /> % Recovery = (Spike Sample Result - Sample Result)*100/Spike Concentration <br /> RPD (Relative % Difference) = (Spiked Sample - Blank Result)*100/Average Result <br /> i <br />