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Report Number: 35100 <br /> QC Report : Matrix Spike/Matrix Spike Duplicate Date : 9/28/2003 <br /> Project Name : Tracy Safeway <br /> Project Number: SAF01.001 <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 35100-01 <0.0050 0.0399 0.0389 0.0374 0.0363 mg/Kg EPA 8260B 9/25/03 93.6 93.3 0.374 70-130 25 <br /> Toluene 35100-01 <0.0050 0.0399 0.0389 0.0374 0.0366 mg/Kg EPA 8260B 9/25/03 93.8 94.2 0.346 70-130 25 <br /> Tert-Butanol 35100-01 <0.0050 0.200 0.194 0.188 0.176 mg/Kg EPA 8260B 9/25/03 94.5 90.5 4.34 70-130 25 <br /> Methyl-t-Butyl Ether 35100-01 <0.0050 0.0399 0.0389 0.0358 0.0342 mg/Kg EPA 8260B 9/25/03 89.8 88.0 2.02 70-130 25 <br /> Benzene 35100-02 <0.0050 0.0399 0.0401 0.0348 0.0349 mg/Kg EPA 8260B 9/26/03 87.3 87.1 0.229 70-130 25 <br /> Toluene 35100-02 <0.0050 0.0399 0.0401 0.0351 0.0363 mg/Kg EPA 8260B 9/26/03 88.0 90.6 2.91 70-130 25 <br /> Tert-Butanol 35100-02 <0.0050 0.200 0.200 0.168 0.184 mg/Kg EPA 8260B 9/26/03 84.0 91.9 8.94 70-130 25 <br /> Methyl-t-Butyl Ether 35100-02 <0.0050 0.0399 0.0401 0.0366 0.0339 mg/Kg EPA 8260B 9/26/03 91.7 84.5 8.17 70-130 25 <br /> Approved By: <br /> KIFF ANALYTICAL, LLC /J <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 V <br />