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i <br /> SReport Number *6 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 3/5/2002 <br /> Project Name 440 W. Charter Way, ` <br /> Protect Number 02021"B1 <br /> Duplicate Spiked <br /> Duplicate Spiked Spiked Sample Relative <br /> Spike Spiked Spiked Sample Sample Relative Percent Percent <br /> Spiked Sample Spike DUD Sample Sample Analysis Date Percent Percent Percent Recov Diff <br /> Parameter Sample Value Level Level Value Value Units Method Analyzed Recov Recov Diff Limit Limit <br /> Benzene 24836-08 <0 50 188 198 186 193 ug/L EPA 8260E 21251200298 9 975 140 70-130 25 <br /> Toluene 24836-08 <0 50 188 198 183 188 ug/L EPA 82608 2/25/200297 4 952 223 70-130 25 <br /> Tert-Butanol 24836-08 <5 0 941 98 8 878 91 9 ug/L EPA 8260E 2/251200293 4 930 0 413 70-130 25 <br /> Methyl-t-Butyl Ether 24836-08 <0 50 188 198 186 193 ug/L EPA 82608 2/251200299 0 977 135 70-130 25 <br /> TPH as Diesel Blank <50 1000 1000 821 821 ug/L M EPA 8015 2/221200282 1 821 000 70-130 25 <br /> Approved By JI Koff <br /> KIFF ANALYTICAL, LLC 0 <br /> 720 Olive Drive, Suite D Davis, CA 95616 530-297-4800 <br />