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Report Number: 204 <br /> QC Report : Matrix Spike/Matrix Spike Duplicate Date . 12/7/2001 - <br /> Project Name : 1267 CountryClub <br /> Project Number: 011128-KF-2 <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 /> Spike Recovery Data <br /> Benzene 23560-04 <0.50 40.0 40.0 38.9 37.8 ug/L EPA 8260E 11130120097.4 94.6 2.86 70-130 25 <br /> Toluene 23560-04 <0.50 40.0 40.0 40.5 39.7 ug/L EPA 8260E 111301200101 99.2 2.00 70-130 25 <br /> Tert-Butanol 23560-04 <5.0 200 200 187 186 ug/i_ EPA 82608 11130120093.4 93.1 0.311 70-130 25 <br /> Methyl-t-Butyl Ether 23560-04 1.1 40.0 40.0 38.8 38.2 ug/L EPA 8260E 11130120094.4 92.8 1.76 70-130 25 <br /> Approved By: J I Kiff <br /> KIFF ANALYTICAL, LLC <br /> 720 Olive Drive, Suite D Davis, CA 95616 530-297-4800 <br />