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GAS CHROMATOGRAPHY —QUALITY CONTROL <br /> BLANK SPIKE <br /> Page 10 <br /> Pest MOD EPA 8015-CDOHS (FUEL HYDROCARBONS/BTXE) ATI I.D. 601161 <br /> Blank Spike #: 61222 Date Extracted: N/A <br /> Client ALISTO ENGINEERING Date Analyzed : 29-JAN-96 <br /> Project # G620562/10-136-OS-003 Sample Matrix : WATER <br /> Project Name BP SITE #11193/3202 W. HAMMER LANE, STOCKTON,CA <br />-------------------------------- <br /> --------------------------------------- <br /> Parameters Units Blank Spiked Spike % <br /> Result Sample Conc. Rec <br />----------------------- <br /> ----------------------------------------------- <br /> BENZENE UG/L <0 .50 4.8 5.0 96 <br /> TOLUENE UG/L <0.50 4 .9 5.0 98 <br />% Recovery = (Spike Sample Result - Sample Result) *100/Spike Concentration <br /> RPD (Relative k Difference) = (Spiked Sample - Blank Result) *100/Average Result <br />