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Report Number 31784 <br /> QC Report. Matrix Spike/Matrix Spike Duplicate Date 3/7/2003 <br /> Project Name SANCHEZ <br /> Project Number <br /> Duplicate Duplicate Spiked <br /> p Spiked Spiked Sample Relative <br /> Spike Spiked Spiked Sample Sample Relative Percent Percent <br /> Spiked Sample Spike Duo 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 31784-02 071 395 394 404 411 ug/L EPA 8260B 313/03 100 102 1 97 70-130 25 <br /> Toluene 31784-02 055 395 394 38 7 403 ug/L EPA 8260B 313103 966 101 420 70-130 25 <br /> Tert-Butanol 31784-02 55 198 197 248 244 ug/L EPA 8260E 3/3103 977 96 2 161 70-130 25 <br /> Methyl-t-Butyl Ether 31784-02 13 395 394 531 54 2 ug/L EPA 82606 313103 102 105 308 70-130 25 <br /> Benzene 31766-01 1 1 400 400 41 3 400 ug/L EPA 8260E 311103 100 973 316 70-130 25 <br /> Toluene 31766-01 <0 50 400 400 38 0 369 ug/L EPA 8260E 311/03 95 0 923 2 83 70-130 25 <br /> Tert-Butanol 31766-01 <5 0 200 200 196 199 ug/L EPA 82606 311103 981 997 162 70-130 25 <br /> Methyl-t-Butyl Ether 31766-01 94 400 400 130 130 ug/L EPA 8260B 3/1103 888 87 7 1 19 70-130 25 <br /> i <br /> Benzene 31771-06 <0 50 400 400 418 409 ug/L EPA 8260E 3/1103 104 102 227 70-130 25 <br /> Toluene 31771-06 <0 50 400 400 41 1 404 ug/L EPA 82606 311/03 103 101 174 70-130 25 <br /> Tert-Butanol 31771-06 <5 0 200 200 203 195 ug/L EPA 8260B 3/1103 101 97 4 399 70-130 25 <br /> Methyl-t-Butyl Ether 31771-06 <0 50 400 400 392 38 7 ug/L EPA 82606 311103 980 968 123 70-130 25 <br /> Approved By J I Kiff <br /> KIFF ANALYTICAL, LLC <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-2974800 <br />