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AnalyticalTechnologies,lnc. <br /> GAS CHROMATOGRAPHY - QUALITY CONTROL <br /> J BLANK SPIKE <br /> Page 22 <br /> Tast MOD EPA 8015-CDOHS (FUEL HYDROCARBONS/BTZE) ATI I.D. 502287 <br /> Stank Spike #: 54793 Date Extracted: N/A <br /> Client ALISTO ENGINEERING Date Analyzed 28-FEB-95 <br /> Project # G317905/10-151-03/003 Sample Matrix WATER <br /> Project Name BP SITE #11195/LATHROP, CA. <br /> ------------------------------------ <br /> Parameters Units Blank Spiked Spike % <br /> Result Sample Conc. Rec <br /> --------------------------------------------------------------------------------------------------- <br /> BENZENE UG/L <0.50 4.7 5.0 94 <br /> TOLUENE UG/L <0.50 4.6 5.0 92 <br /> 1 Recovery = (Spike Sample Result - Sample Result)*100/Spike Concentration <br /> RPD (Relative % Difference) _ (Spiked Sample - Blank Result)*100/Average Result <br />