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Report Number 25120 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 3/21/2002 <br /> Project Name ARC PUMP & WELD <br /> Project Number <br /> Duplicate Spiked Duplicate Spiked <br /> am le 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 25120-04 2 8 38 0 397 400 425 uglL EPA 8260B 31171200298 1 100 2 14 70-130 25 <br /> Toluene 25120-04 <0 50 38 0 397 371 39 3 ug/L EPA 8260B 31171200297 7 991 140 70-130 25 <br /> Tert-Butanol 25120-04 <5 0 190 198 182 202 uglL EPA 8260B 31171200296 2 102 567 70-130 25 <br /> Methyl-t-Butyl Ether 25120-04 056 380 39 7 368 39 0 ug1L EPA 82606 3117!200295 4 96 8 152 70-130 25 <br /> Benzene 25389-01 <0 50 400 400 434 424 uglL EPA 82606 311812002109 106 230 70-130 25 <br /> Toluene 25389-01 <0 50 400 400 449 442 ug1L EPA 8260B 311812002112 110 1 59 70-130 25 <br /> Tert-Butanol 25389-01 <5 0 200 200 201 210 uglL EPA 82606 311812002100 105 411 70-130 25 <br /> Methyl-t-Butyl Ether 25389-01 <0 50 400 400 422 398 uglL EPA 8260B 311812002105 996 578 70-130 25 <br /> Approved By Joel Kiff <br /> KIFF ANALYTICAL, LLC <br /> 720 Olive Drive, Suite D Davis, CA 95616 530-297-4800 V <br />