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GAS CHROMATOGRAPHY - QUALITY CONTROL <br /> BLANK SPIKE <br /> Page 12 <br /> Test MOD EPA 8015-CDOHS (FUEL HYDROCARBONS/BTXE) ATT I.D- 601.161 <br /> Blank Spike #: 61224 Date Extracted: N/A <br /> Client ALISTO ENGINEERING Date Analyzed 29-JAN-96 <br /> Project # G620562/10-136-05-003 Sample Matrix WATER <br /> Project Name BP SITE #11193/3202 W. HAMMER LANE, STOCKTON,CA <br /> ---------------------------------------------------__-___--------------------------------------- <br /> Parameters Units Blank Spiked Spike % <br /> Result Sample Conc. Rec <br /> ------------------------------------------------------------------------------------------------ <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 'k Difference) _ (Spiked Sample - Blank Result) *100/Average Result <br />