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Report Number 45763 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 9/12/2005 <br /> Project Name 7-Eleven Store #20632 <br /> Project Number 77EL 20632 05 <br /> Duplicate Spiked <br /> Duplicate Spiked Spiked 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 45763-01 <0 50 400 400 39 3 387 ug/L EPA 8260B 919105 983 967 168 70-130 25 <br /> Toluene 45763-01 079 400 400 39 9 392 ug/L EPA 8260B 919105 978 961 1 74 70-130 25 <br /> Tert-Butanol 45763-01 <5 0 200 200 220 218 ug/L EPA 8260B 919105 110 109 0 506 70-130 25 <br /> Methyl-t-Butyl Ether 45763-01 260 400 400 294 295 ug/L EPA 8260B 919105 738 748 1 34 70-130 25 <br /> Benzene 45845-02 <0 50 400 400 39 6 396 ug/L EPA 8260B 9110105 990 989 0 172 70-130 25 <br /> Toluene 45845-02 <0 50 400 400 365 355 ug/L EPA 8260B 9110105 913 888 277 70-130 25 <br /> Tert-Butanol 45845-02 <5 0 200 200 214 216 ug/L EPA 8260B 9110105 107 108 0 930 70-130 25 <br /> Methyl-t-Butyl Ether 45845-02 <0 50 400 400 365 371 ug/L EPA 8260B 9110105 91 3 927 150 70-130 25 <br /> Benzene 45763-02 <0 50 400 400 364 361 ug/L EPA 8260B 918105 91 1 902 0 984 70-130 25 <br /> Toluene 45763-02 <0 50 400 400 364 365 ug/L EPA 8260B 918105 910 91 2 0 210 70-130 25 <br /> Tert-Butanol 45763-02 <5 0 200 200 199 202 ug/L EPA 8260B 918105 99 3 101 1 87 70-130 25 <br /> Methyl-t-Butyl Ether 45763-02 <0 50 400 400 36 3 373 ug/L EPA 8260B 918/05 908 933 263 70-130 25 <br /> Benzene 45718-06 30 400 400 674 660 ug/L EPA 8260B 919/05 941 906 3 76 70-130 25 <br /> Toluene 45718-06 1 8 400 400 381 378 ug/L EPA 8260B 919105 906 898 0 836 70-130 25 <br /> Tert-Butanol 45718-06 9 9 200 200 205 206 ug/L EPA 8260B 919105 977 979 0 226 70-130 25 <br /> Methyl-t-Butyl Ether45718-06 14 400 400 420 41 1 ug/L EPA 8260E 919105 101 994 207 70-130 25 <br /> Benzene 45786-01 <0 50 400 400 407 405 ug/L EPA 82608 918105 102 101 0 333 70-130 25 <br /> Toluene 45786-01 <0 50 400 400 407 406 ug/L EPA 8260B 918105 102 102 0 258 70-130 25 <br /> Approved By ,!o Iff i <br /> KIFF ANALYTICAL, LLC <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 <br />