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i <br /> Report Number 37692 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 4/5/2004 <br /> Protect Name 7-Eleven Store #19976 <br /> Protect Number 77EL 19976 04 <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 37696-01 <0 50 400 400 428 402 ug/L EPA 82608 3131104 107 100 622 70-130 25 <br /> Toluene 37696-01 <0 50 400 400 41 6 383 ug/L EPA 8260B 3131104 104 95 6 848 70-130 25 <br /> Tert-Butanol 37696-01 <5 0 200 200 211 222 ug/L EPA 82606 3131104 105 111 4 97 70-130 25 <br /> Methyl-t-Butyl Ether 37696-01 <0 50 400 400 378 38 8 ug/L EPA 8260B 3131104 944 970 2 69 70-130 25 <br /> Benzene 37727-04 <0 50 400 400 442 415 ug/L EPA 8260B 411104 110 104 635 70-130 25 <br /> Toluene 37727-04 <0 50 400 400 453 430 ug/L EPA 82606 411104 113 108 509 70-130 25 <br /> Tert-Butanol 37727-04 <5 0 200 200 195 195 ug/L EPA 8260B 411104 975 976 00449 70-130 25 <br /> Methyl-t-Butyl Ether 37727-04 <0 50 400 400 364 34 6 ug/L EPA 82606 4/1104 911 865 518 70-130 25 <br /> Benzene 37695-01 <0 50 400 400 371 363 ug/L EPA 8260B 3130104 927 908 203 70-130 25 <br /> Toluene 37695-01 <0 50 400 400 389 38 0 ug/L EPA 8260B 3130104 97 3 950 243 70-130 25 <br /> Tert-Butanol 37695-01 <5 0 200 200 187 184 ug/L EPA 82606 3130104 934 91 9 1 58 70-130 25 <br /> ethyl-t-Butyl Ether 37695-01 <0 50 400 400 396 399 ug/L EPA 8260B 3130104 99 0 99 7 0 626 70-130 25 <br /> J <br /> Approved By iJ IOVI <br /> KIFF ANALYTICAL, LLC j <br /> 2795 2nd St, Suite 300 or, <br /> CA 95616 530-297-4800 (�!J <br />