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i <br /> Report Number 27504 <br /> QC Report Matrix Spike/ Matrix Spike Duplicate Date 7121/2002 <br /> Project Name ROBLES IRRIGATION <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 DUD Sample Sample Analysis Date Percent Percent Percent Recov Diff <br /> Parameter Sample Value Level Level Value Value Units Method Analyzed Recov Recov Diff Lima Limit <br /> Benzene 27493-06 <0 50 400 400 38 9 38 0 ug/L EPA 8260B 7117102 972 949 242 70-130 25 <br /> Toluene 27493-06 <0 50 400 400 396 38 7 ug/L EPA 8260B 7117102 98 9 96 8 220 70-130 25 <br /> Tert-Butanol 27493-06 <5 0 200 200 185 182 ug/L EPA 8260E 7117102 925 91 2 1 51 70-130 25 <br /> Methyl-t-Butyl Ether 27493-06 28 400 400 646 62 9 ug/L EPA 8260B 7117102 901 860 4 68 70-130 25 <br /> Approved By Jbel Kiff <br /> KIFF ANALYTICAL, LLC <br /> 1 <br /> 720 Olive Drive, Suite D Davis, CA 95616 530-297-4800 �� <br />