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Rep ort Number 29077 <br /> 4C Report: Matrix Spike/Matrix Spike Duplicate Date 10/15/2002 <br /> Project Name 2575 Country Club Blvd, <br /> Project Number 2440783 <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 1k Diff Limit Limit <br /> Benzene 29085-02 61 39.8 39 9 88.9 889 ug/L EPA 82608 10/12/02 69 6 69 3 0.387 70-130 25 <br /> Toluene 29085-02 0.91 398 399 43.0 43 2 ug/L EPA 82606 10/12/02 106 106 0 122 70-130 25 <br /> Tert Butanol 29085-02 48 199 200 254 254 ug/L EPA 8260B 10/12/02 103 103 0 293 70-130 25 <br /> Methyl-t-Butyl Ether29085.02 7.2 39.8 39.9 468 46 9 ug/L EPA 82603 10/12/02 99.4 995 0137 70-130 25 <br /> Benzene 29077-02 <0 50 40.0 400 400 399 ug/L EPA 82606 10/11/02 999 99.6 0 250 70-130 25 <br /> Toluene 29077-02 <0 50 40.0 400 390 38 8 ug/L EPA 8260E 10/11/02 976 969 0 771 70-130 25 <br /> Tert-Butanol 29077-02 8100 200 200 8200 8300 ug/L EPA 8260B 10/11/02 551 106 637 70-130 25 <br /> Methyl-t-Butyl Ether 29077-02 <0.50 40.0 400 34 7 34 8 ug/L EPA 82608 10/11/02 868 869 0144 70-130 25 <br /> i <br /> U <br /> Approved By J ` I Kiff <br /> KIFF ANALYTICAL, LLC <br /> 2795 2nd St„Suite 30C Os, CA 95616 530-297-4800 <br />