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i Report Number 26144 QC Report: Matrix Spike/Matrix Spike Duplicate Date 5/2/2002 Project Name Chevron 9-5775/301 W Project Number 77CH.43452.00.0550 Duplicate Spiked Duplicate Spiked Spiked Sample Relative Spike Spiked Spiked Sample Sample Relative Percent Percent Spiked Sample Spike Dup Sample Sample Analysis Date Percent Percent Percent Recov Diff Parameter Sample Value Level Level Value Value Units Method Analyzed Recov Recov Diff Limit Limit Benzene 26148-04 <0 50 400 400 423 41 0 ug/L EPA 82606 511102 106 102 3 00 70-130 25 Toluene 26148-04 <0 50 400 400 431 408 ug/L EPA 8260B 511102 108 102 545 70-130 25 Tert-Butanol 26148-04 81 200 200 229 223 ug/L EPA 8260B 511102 110 107 298 70-130 25 Methyl-t-Butyl Ether 26148-04 23 400 400 41 1 389 ug/L EPA 8260B 511102 969 914 576 70-130 25 Benzene 2614404 <0 50 400 400 365 35 9 ug/L EPA 8260B 512102 913 898 1 60 70-130 25 Toluene 2614404 <0 50 400 400 377 366 ug/L EPA 8260B 512102 94 4 914 315 70-130 25 4 Tert Butanol 26144-04 <5 0 200 200 185 183 ug1L EPA 8260E 512/02 92 6 914 131 70-130 25 Methyl-t-Butyl Ether 2614404 130 400 400 164 162 ug/L EPA 8260B 512102 917 86 6 569 70-130 25 Benzene 26143-02 <0 50 400 400 370 333 ug/L EPA 82608 512102 926 832 107 70-130 25 Toluene 26143-02 6 5 400 400 447 420 ug/L EPA 8260B 512102 953 88 6 723 70-130 25 Tert-Butanol 26143-02 32 200 200 230 229 ug/L EPA 8260E 512102 988 984 0 426 70-130 25 Methyl-t-Butyl Ether 26143-02 100 400 400 138 123 ug/L EPA 8260B 512102 962 586 48 6 70-130 25 Benzene 26123-01 <0 50 400 400 422 409 ug/L EPA 6260B 5/1102 105 102 306 70-130 25 Toluene 26123-01 <0 50 400 400 431 418 ug/L EPA 8260B 511102 108 104 3 04 70-130 25 Tert-Butanol 26123-01 <5 0 200 200 201 201 ug/L EPA 8260B 511102 100 100 0 144 70-130 25 Methyl-t-Butyl Ether 26123-01 <0 50 400 400 408 391 ug/L EPA 8260B 511102 102 97 7 4 26 70-130 25 �� q Approved By JLel Kiff KIFF ANALYTICAL, LLC j 720 Olive Drive, Suite D Davis, CA 95616 530-297-4800 v