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Report Number 33257 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 5/30/2003 <br /> Project Name 7-Eleven Store#17334 <br /> Project Number 77EL.17334.03 <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 /> _ _ Analyzed o <br /> Parameter Sample Value Level Level Value Value Units Method Anal ed Recov Recv Diff Limit Limit <br /> Benzene 33219-01 44 398 400 422 423 ug/L EPA 82606 5125/03 949 947 0 244 70-130 25 <br /> Toluene 33219-01 47 398 400 426 425 ug/L EPA 8260B 5125103 949 943 0 610 70-130 25 <br /> Tert-Butanol 33219-01 56 199 200 248 250 ug/L EPA 8260E 5125103 964 969 0 499 70-130 25 <br /> Methyl-t-Butyl Ether 33219-01 24 398 400 636 633 ug/L EPA 82608 5125103 996 984 117 70-130 25 <br /> Benzene 33272-01 <0 50 400 400 420 412 ug/L EPA 8260B 5124103 105 103 1 85 70-130 25 <br /> Toluene 33272-01 <0 50 400 400 405 39 8 ug/L EPA 8260E 5124103 101 99 4 182 70-130 25 <br /> Tert-Butanol 33272-01 <50 200 200 209 209 ug/L EPA 82606 5124103 105 105 00191 70-130 25 <br /> Methyl-t-Butyl Ether 33272-01 38 400 400 429 432 ug/L EPA 82606 5124103 978 985 0 790 70-130 25 <br /> Benzene 33291-01 <0 50 400 400 419 41 5 ug/L EPA 8260B 5128103 105 104 105 70-130 25 <br /> Toluene 33291-01 <0 50 400 400 410 409 ug/L EPA 82606 5128103 102 102 0 268 70-130 25 <br /> Tert-Butanol 33291-01 <5 0 200 200 203 203 ug/L EPA 82606 5128103 102 101 00443 70-130 25 <br /> Methyl-t-Butyl Ether33291-01 <0 50 400 400 315 38 3 ug/L EPA 82606 5128103 787 95 8 197 70-130 25 <br /> KIFF ANALYTICAL, LLC Approved By J I Kiff <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-2974800 <br />