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Report Nil mber 31922 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 3/11/2003 <br /> ProjectName 2575 COUNTRY CLUB <br /> Project Number 245-0783 <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 J[ Value Units Method Analyzed Recov Recov Diff Limit Limit <br /> Benzene 31922-04 <0 50 400 400 429 41 4 ug/L EPA 8260B 315103 107 103 368 70-130 25 <br /> Toluene 31922-04 <0 50 400 400 397 391 ug/L EPA 8260E 315/03 992 977 1 57 70-130 25 <br /> Tert-Butanol 31922-04 2000 200 200 2200 2220 ug/L EPA 8260B 315103 91 4 103 120 70-130 25 <br /> Methyl-t-Butyl Ether 31922-04 <0 50 400 400 391 384 ug/L EPA 8260E 315103 97 8 959 1 94 70-130 25 <br /> I <br /> Benzene 31891-10 <0 50 400 400 377 362 ug/L EPA 8260E 317103 942 904 412 70-130 25 <br /> Toluene 31891-10 <0 50 400 400 366 352 ug/L EPA 8260E 317103 91 6 88 0 4 01 704 30 25 <br /> Tert-Butanol 31891-10 <5 0 200 200 195 192 ug/L EPA 8260E 3[7/03 974 963 1 115 70-130 25 <br /> Methyl-t-Butyl Ether 31891-10 <0 50 400 400 379 37 0 ug/L EPA 8260E 317103 947 926 222 70-130 25 <br /> Approved By J 1 KIff <br /> KIFF ANALYTICAL, LLC <br /> 2795 2nd St, (Suite 300oins, CA 95616 530-297-4800 <br />