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` GAS CHROMATOGRAPHY - QUALITY CONTROL <br /> • BLANK SPIKE <br /> Page 14 <br />'est MOD EPA 8015-CDOHS (FUEL HYDROCARBONS/BTXE) ATI I .D. : 510257 <br /> 31ank Spike #: 59779 Date Extracted: N/A <br /> Tient ALISTO ENGINEERING Date Analyzed 02-NOV-95 <br />?roject # G620560/10-037-05-002 Sample Matrix WATER <br />?roject Name BP SITE#11192/1403 COUNTY CLUB BLVD, STOCKTON, CA <br />----------------------------- -- <br /> - ---------------------------------------- <br /> -- <br /> Parameters Units Blank Spiked Spike <br /> Result Sample Conc. Rec <br />-------------------------- <br /> --------------------------- <br /> ------------------- <br /> 98 <br /> BENZENE UG/L <0.50 4.9 5. 0 <br /> TOLUENE UG/L <0. 50 4. 9 5 . 0 98 <br />%- Recovery = (Spike Sample Result - Sample Result) *100/Spike Concentration <br /> APD (Relative k Difference) _ (Spiked Sample - Blank Result) *100/Average Result <br />