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= M m4r M <br /> Report Number 24923 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 318102 <br /> Project Name Former Stefano Gas <br /> Project Number <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 24926-03 <0 50 201 201 202 192 ug/L EPA 8260B 313102 101 95 9 498 70-130 25 <br /> Toluene 24926-03 <0 50 201 201 207 196 ug/L EPA 8260E 313102 103 978 549 70-130 25 <br /> Tert-Butanol 24926-03 <5 0 100 100 969 92 6 ug/L EPA 8260B 313102 96 5 924 439 70-130 25 <br /> Methyl-t-Butyl Ether 24926-03 17 201 201 318 329 ug/L EPA 82608 313102 744 802 749 70-130 25 <br /> Benzene 25061-01 <0 50 400 400 415 407 ug/L EPA 82606 312102 104 102 187 70-130 25 <br /> Toluene 25061-01 <0 50 400 400 418 404 ug/L EPA 82606 312102 104 101 338 70-130 25 <br /> Tert-Butanol 25061-01 <5 0 200 200 212 212 ug/L EPA 8260B 312102 106 106 0 255 70-130 25 <br /> Methyl-t-Butyl Ether 25061-01 <0 50 400 400 39 8 37 9 ug/L EPA 8260E 312/02 995 946 497 70-130 25 <br /> Benzene 24923-02 17 400 400 41 9 441 ug/L EPA 8260B 312102 100 106 528 70-130 25 <br /> Toluene 24923-02 13 400 400 61 1 602 ug/L EPA 8260B 312102 121 119 185 70-130 25 <br /> Tert-Butanol 24923-02 <5 0 200 200 191 206 ug/L EPA 8260B 312102 957 103 747 70-130 25 <br /> Methyl-t-Butyl Ether 24923-02 <0 50 400 400 359 438 ug/L EPA 82606 3/2102 898 109 196 70-130 25 <br /> i <br /> Approved By Jbel Kiff <br /> KIFF ANALYTICAL, LLC <br /> 720 Olive Drive, Suite D Davis, CA 96616 530-297-4800 U <br />