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Report Number 43510 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 5/6/2005 <br /> Project Name 7-Eleven Store#14117 <br /> Project Number 77EL 14117. <br /> Siked <br /> Duplicate Spiked Spiked to 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 43514-01 <0 50 398 401 376 376 ug/L EPA 82606 513105 944 938 0 615 70-130 25 <br /> Toluene 43514-01 <0 50 398 401 401 400 ug/L EPA 8260B 513105 101 998 0 840 70-130 25 <br /> Tert-Butanol 43514-01 <5 0 199 200 186 186 ug/L. EPA 8260B 513105 931 931 00419 70-130 25 <br /> Methyl-t-Butyl Ether 43514-01 <0 50 398 401 346 34 4 ug/L EPA 8260B 513105 868 85 8 1 16 70-130 25 <br /> Benzene 43510-02 <0 50 400 400 427 39 5 ug/L EPA 8260E 5/2105 107 98 8 7 81 70-130 25 <br /> Toluene 43510-02 <0 50 400 400 378 376 ug/L EPA 8260B 512105 94 6 939 0 679 70-130 25 <br /> Tert-Butanol 43510-02 <5 0 200 200 222 216 ug/L EPA 82606 512105 111 108 317 70-130 25 <br /> Methyl-t-Butyl Ether 43510-02 <0 50 400 400 32 5 31 7 ug/L EPA 8260B 512105 81 3 794 239 70-130 25 <br /> Benzene 43510-05 <0 50 400 400 36 7 361 ug/L EPA 8260B 512105 917 902 162 70-130 25 <br /> Toluene 43510-05 <0 50 400 400 38 5 378 ug/L EPA 82608 512105 96 3 94 5 186 70-130 25 <br /> Tert-Butanol 43510-05 <5 0 200 200 194 198 ug/L EPA 8260B 512105 968 993 2 57 70-130 25 <br /> Methyl-t-Butyl Ether 43510-05 <0 50 400 400 35 6 348 ug/L EPA 8260B 512105 890 871 219 70-130 25 <br /> Benzene 43524-01 <0 50 400 400 41 3 401 ug/L EPA 8260B 514105 103 100 313 70-130 25 <br /> Toluene 43524-01 <0 50 400 400 41 0 402 ug/L EPA 8260E 514105 102 100 2 01 70-130 25 <br /> Tert-Butanol 43524-01 14 200 200 218 220 ug/L EPA 8260B 514105 102 103 1 07 70-130 25 <br /> Methyl-t-Butyl Ether 43524-01 <0 50 400 400 41 3 403 ug/L EPA 82606 514105 103 101 247 70-130 25 <br /> Benzene 43510-08 6 9 400 400 463 461 ug/L EPA 82606 512105 986 982 0 453 70-130 25 <br /> Toluene 43510-08 88 400 400 498 49 4 ug/L EPA 82606 512!05 102 101 102 70-130 25 <br /> Approved By Joff <br /> KIFF ANALYTICAL, LLC <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 <br />