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February 1998 Monthly Report <br /> Page 2 <br /> Ni=(Xi-Xf)/Sf <br /> Ni=(584-519)/124 <br /> Ni= +0. 52 <br /> The index number graph and updated reporting table are attached. <br /> Evaluation of the normalized data: <br /> The index value of +0. 52 for February indicates that the <br /> 2issolved zinc concentration at the reference point A-72 was higher <br /> than the mean of the reference data set for the flow class. This <br /> result (+0. 52) is not above the variance from the mean that could <br /> be expected. In comparison to the results from February, 1997, it <br /> is a 17% reduction in concentration (700 ug/1 compared to 584 <br /> ug/1) . This is a significant improvement. <br /> A 12 period moving average graph is attached. The calculated <br /> moving average value for the normalized residual is +0.708. This is <br /> a decrease from the January 12-month average of +0. 786. The <br /> 3ecreasing trend is positive and if this continues, the 12-month <br /> average will be around the +0. 577 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 ` <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 />