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Report Number 34522 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 8/20/2003 <br /> Project Name 7-Eleven Store #17334 <br /> Project Number 77EL 17334 03 <br /> i <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 DO <br /> Parameter Sample Value Level Level Value Value Units Method Analyzed Recov Recov Diff Limit Limit <br /> Benzene 34512-20 <0 50 400 400 41 7 398 ug/L EPA 8260B 8117103 104 996 468 70-130 25 <br /> Toluene 34512-20 <0 50 400 400 41 3 402 ug/L EPA 8260B 8117103 103 100 267 70-130 25 <br /> Tert-Butanol 34512-20 130 200 200 335 332 ug/L EPA 8260B 8117103 102 100 148 70-130 25 <br /> Methyl-t-Butyl Ether 34512-20 <0 50 400 400 455 439 ug/L EPA 8260B 8117103 114 110 353 70-130 25 <br /> Benzene 34518-09 <br /> <0 50 400 400 405 38 5 ug IL EPA 82608 8115103 101 962 514 70-130 25 <br /> Toluene 34518-09 <0 50 400 400 448 428 ug1L EPA 82608 8115103 112 107 459 70-130 25 <br /> Tert-Butanol 34518-09 <5 0 200 200 202 199 ug/L EPA 8260B 8115103 101 995 1 36 70-130 25 <br /> Methyl-t-Butyl Ether 34518-09 <0 50 400 400 432 427 ug/L EPA 8260B 8115103 108 107 1 33 70-130 25 <br /> Benzene 34527-11 5 8 400 400 442 427 ug/L EPA 8260B 8117103 961 922 4 12 70-130 25 <br /> Toluene 34527-11 <0 50 400 400 426 41 2 ug/L EPA 8260E 8117103 106 103 317 70-130 25 <br /> Tert-Butanol 34527-11 <5 0 200 200 196 197 ug/L EPA 82608 8117103 978 984 0 612 70-130 25 <br /> Methyl-t-Butyl Ether 34527-11 <0 50 400 400 44 9 435 ug/L EPA 8260B 8117/03 112 109 324 70-130 25 <br /> Approved By 1J ! <br /> KIFF ANALYTICAL, LLC I J <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 <br />