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6)k Analyt,colTechnologies,lnc <br /> • GAS CHROMATOGRAPHY - QUALITY CONTROL <br /> BLANK SPIKE <br /> Page 13 <br /> Test MOD EPA 8015-CDOHS (FUEL HYDROCARBONS/BTSE) ATI I.D. 502257 <br /> Blank Spike #: 54758 Date Extracted: N/A <br /> Client : ALISTO ENGINEERING Date Analyzed : 27-FEB-95 <br /> Project # G029043/10-085-05-001 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. Rec <br /> ---------------------------------------,»------------------------------------ -------------------- <br /> BENZENE UG/L <0.50 4.9 5.0 98 <br /> TOLUENE UG/L <0 50 4.9 5.0 98 <br /> % Recovery = (Spike Sample Result - Sample Result)*IOO/Spike Concentration <br /> RPD (Relative % Difference) = (Spiked Sample - Blank Result)*I00/Average Result <br /> • <br />