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January 1998 Monthly Report <br /> Page 3 <br /> The index number graph and updated reporting table are attached. <br /> Evaluation of the normalized data: <br /> The index value of +0. 54 for January indicates that the <br /> dissolved zinc concentration at the reference point A-72 was <br /> higher than the mean of the reference data set for the flow <br /> class. This result (+0.54) is not above the variance from the <br /> mean that could be expected. In comparison to the results <br /> from January, 1997, it is a 16% reduction in concentration <br /> (695 ug/l compared to 586 mg/1) . This is a significant <br /> improvement. <br /> A 12 period moving average graph is attached. The calculated <br /> moving average value for the normalized residual is +0. 786. <br /> This is a decrease from the December 12-month average of <br /> +0. 859 . The decreasing trend is positive and if this <br /> continues, the 12-month average will be around the +0. 577 <br /> value in April or May. <br /> If you have any questions on this report, please contact me. <br /> I certify under penalty of law <br /> that I have personally examined Sincerely, <br /> and am familiar with the information <br /> submitted herein: and based on my ���u, ta <br /> inquiry of those individuals <br /> immediately responsible for Larry Perino <br /> obtaining the information, I Reclamation Manager <br /> believe the submitted information <br /> is true, accurate and complete. <br /> I am aware that there are significant <br /> penalties for submitting false <br /> information, including the possibility <br /> of fine and imprisonment. See 15 U.S.C. <br /> Section 1001 and 33 U.S.C. Section 1319 <br /> cc: EPA - Melanie Pallman <br /> EPA Region 8 (8ENF-T) <br /> DMG - Wally Erickson <br /> Allen Sorenson <br /> LP/lf <br />