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Report Number 28* <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 10/15/02 <br /> i <br /> Project Name 7700 Moreland Court, <br /> Project Number 020930-BA2 <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 28926-01 <0 50 397 39 6 427 425 ug/L EPA 8260E 10/11/02 108 107 0 233 70-130 25 <br /> Toluene 28926-01 <0 50 39 7 39 6 422 41 8 ug/L EPA 8260E 10/11/02 106 106 0 826 70-130 25 <br /> Tert-Butanol 28926-01 <5 0 198 198 205 201 ug/L EPA 8260E 10/11/02 103 102 1 64 70-130 25 <br /> Methyl-t-Butyl Ether 28926-01 170 397 39 6 203 195 ug/L EPA 8260B 10/11/02 791 58 3 303 70-130 25 <br /> _ Benzene 28955-10 <0 50 400 400 398 392 ug/L EPA 82608 1015102 994 979 1 52 70-130 25 <br /> - Toluene 28955-10 <0 50 400 400 384 382 ug/L EPA 8260B 1015102 961 955 0 626 70-130 25 <br /> Tert-Butanol 28955-10 <50 200 200 212 209 ug/L EPA 8260B 1015102 106 104 129 70-130 25 <br /> - - Methyl-t-Butyl Ether 28955-10 70 400 400 115 114 ug/L EPA 82603 1015102 113 111 206 70-130 25 <br /> f <br /> i <br /> i <br /> KIFF ANALYTICAL, LLC Approved By J i Kiff <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 <br />