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GAS CHROMATOGRAPHY - QUALITY CONTROL <br /> BLANK SPIKE <br /> i Page 12 <br /> Test MOD EPA 8015-CDOHS (FUEL HYDROCARBONS/BTXE) ATI I.B. 510035 <br /> Blank Spike #: 59396 Date Extracted: N/A <br /> Client ALISTO ENGINEERING Date Analyzed : 12-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 - Units Blank Spiked Spike $ <br /> Result Sample Conc <br /> , Rec <br /> ------------------------...----..------------------r---------"------------- --------------------------- <br /> BENZENE UG/L <0.50 4.5 5.0 90 <br /> TOLUENE UG/L <0.50 4.6 5.0 92 <br /> % Recovery = (Spike Sample Result - Sample Result)*100/Spike Concentration <br /> RPD (Relative % Difference) _ (Spiked Sample - Blank Result)*100/Average Result <br /> i <br /> i <br /> I <br /> ;k <br /> Y I <br />