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i <br /> Report Number 42167 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 2/7/2005 <br /> Project Name 7-Eleven Store #14117 <br /> Project Number 77EL 14117 05 <br /> Siked <br /> Duplicate Spiked Spiked to Sample Relative <br /> Spike Spiked Spiked Sample Sample Relative Percent Percent <br /> Spiked Sample Spike Dup 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 42112-01 18 39 5 395 400 402 ug/L EPA 8260B 213105 968 973 0 578 70-130 25 <br /> Toluene 42112-01 2 2 395 395 427 426 ug/L EPA 8260B 213105 102 102 0 322 70-130 25 <br /> Tert-Butanol 42112-01 5 7 198 198 196 205 ug/L EPA 82608 213105 966 101 445 70-130 25 <br /> Methyl-t-Butyl Ether42112-01 34 39 5 39 5 386 381 ug/L EPA 8260B 213105 889 878 1 33 70-130 25 <br /> Benzene 42215-04 0 60 400 400 360 351 ug/L EPA 8260B 215105 88 4 862 2 50 70-130 25 <br /> Toluene 42215-04 <0 50 400 400 320 31 5 ug/L EPA 8260B 215105 801 78 7 1 76 70-130 25 <br /> Tert-Butanol 42215-04 <5 0 200 200 174 173 ug/L EPA 8260B 215105 872 866 0 759 70-130 25 <br /> Methyl-t-Butyl Ether42215-04 <0 50 400 400 325 324 ug/L EPA 8260B 215/05 812 81 1 00607 70-130 25 <br /> Benzene 42221-05 <0 50 400 400 424 418 ug/L EPA 8260B 2/5/05 106 104 144 70-130 25 <br /> Toluene 42221-05 <0 50 400 400 402 391 ug/L EPA 82608 2/5/05 100 978 2 61 70-130 25 <br /> Tert-Butanol 42221-05 <5 0 200 200 221 222 ug/L EPA 8260B 2/5/05 111 111 0 544 70-130 25 <br /> Methyl-t-Butyl Ether 42221-05 56 400 400 943 95 3 ug/L EPA 8260E 2/5105 954 978 2 54 70-130 25 <br /> Benzene 42163-04 <0 50 40 0 400 396 38 2 ug/L EPA 82608 2/2/05 990 955 362 70-130 25 <br /> Toluene 42163-04 <0 50 400 400 392 382 ug/L EPA 8260B 212/05 979 956 2 37 70-130 25 <br /> Tert-Butanol 42163-04 <5 0 200 200 200 204 ug/L EPA 8260B 2/2105 100 102 172 70-130 25 <br /> Methyl-t-Butyl Ether 42163-04 <0 50 400 400 360 358 ug/L EPA 8260B 2/2105 899 89 6 0 344 70-130 25 <br /> Benzene 42170-02 12 400 400 401 39 0 ug/L EPA 8260B 2/3105 973 94 7 2 74 70-130 25 <br /> Toluene 42170-02 <0 50 400 400 39 5 388 ug/L EPA 8260B 2/3/05 988 970 187 70-130 25 <br /> Approved By Jo Iff <br /> KI1=F ANALYTICAL, LLC <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 <br />