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Report Number 26408 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 5/21/2002 <br /> Project Name ROSSI <br /> Project Number 3490 <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 26418-04 <0 50 400 400 367 362 ug/L EPA 82608 5/16102 918 904 145 70-130 25 <br /> Toluene 26418-04 <0 50 400 400 376 368 ug/L EPA 82606 5116102 940 92 0 218 70-130 25 <br /> Tert-Butanol 26418-04 7900 200 200 7790 8130 ug1L EPA 8260B 5116102 000 131 200 70-130 25 <br /> Methyl-t-Butyl Ether 26418-04 <0 50 400 400 297 298 ug/L EPA 82606 5116102 742 746 0 537 70-130 25 <br /> Benzene 26425-03 <0 50 400 400 401 395 ug/L EPA 8260E 5117102 100 987 148 70-130 25 <br /> Toluene 26425-03 <0 50 400 400 406 405 ug/L EPA 8260E 5117102 102 101 0 394 70-130 25 <br /> Tert-Butanol 26425-03 26 200 200 219 221 ug/L EPA 8260B 5117102 964 975 1 07 70-130 25 <br /> Methyl-t-Butyl Ether 26425-03 060 400 400 403 390 ug/L EPA 8260B 5117102 993 960 346 70-130 25 <br /> Approved By Jael Kiff <br /> KIFF ANALYTICAL, LLC i <br /> If <br /> 720 Olive Drive, Suite D Davis, CA 95616 530-297-4800 V <br />