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4 — — <br /> i <br /> n <br /> n i <br /> j Report Number 37731 <br /> QC Report Matrix Spi;kel,Matn c Spike Duplicate Date 4/8/2004 <br /> Project Name Former Bea on 12474 <br /> Project Number 1474.15 <br /> DuDuplicate Duplicate Spiked <br /> P 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 37771-08 <Ip 50 400 400 439 428 ug/L EPA 8260B 414104 X110 107 264 70-130 25 <br /> Toluene 37771-08 < 50 400 400 441 42 6 ug/L EPA 8260B 414104 1110 106 3 42 70-130 25 <br /> Tert-Butanol 37771-08 5 200 200 279 273 ug/L EPA 8260B 414104 1112 109 276 70-130 25 <br /> Methyl-t-Butyl Ether 37771-08 4 400 40 0 834 824 ug/L EPA 8260B 414104 104 102 232 70-130 25 <br /> Benzene 37751-01 <0 50 400 40 4 II <br /> 0 fl 8 39 4 uglL EPA 82608 412104 '�02 <br /> 984 348 70-130 25 <br /> Toluene 37751-01 < 50 400 400 422 406 ug1L EPA 82606 412104 I�06 101 4 05 70-130 25 <br /> Tert-Butanol 37751-01 <5 0 200 200 201 199 ug/L EPA 8260B 412104 1100 99 4 0 963 70-130 25 <br /> Methyl-t-Butyl Ether 37751-01 1.6 400 400 426 41 0 ug/L EPA 82606 412104 102 983 417 70-130 25 <br /> Benzene 37827-04 <0 50 400 400 426 41 3 ug/L EPA 8260B 418104 11106 103 2 94 70-130 25 <br /> Toluene 37827-04 <3 50 400 400 416 409 ug/L EPA 8260B 418104 X104 102 164 70-130 25 <br /> Tert-Butanol 37827-04 <50 200 200 200 210 ug/L EPA 8260B 418104 '100 105 4 85 70-130 25 <br /> Methyl-t-Butyl Ether 37827-04 <3 50 400 400 387 385 ug/L EPA 8260B 418104 969 962 0 710 70-130 25 <br /> E <br /> i <br /> { Approved 8 �KIFF ANALWAL LLC PP y Joe t iff <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-2974800 <br />