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July 1996 Monthly Report <br /> Page 5 <br /> Index number calculation <br /> Xi = 330 <br /> Xf = 399 <br /> Sf = 144 <br /> Ni = (Xi - Xf)/Sf <br /> Ni = ( 330 - 399)/144 <br /> Ni = -0 .48 <br /> The index number graph is attached. <br /> Evaluation of the normalized data: <br /> The index value is -0 . 48 which would indicate that this result <br /> was lower than the mean value of the reference data for this <br /> flow class. Therefore no further evaluation or sampling is <br /> required. <br /> Please contact me if you have any questions or require additional <br /> information. <br /> Attached separate from this report are 2 corrected pages for the <br /> June, 1996 report. On page 5 the reported zinc value was listed as <br /> 280 mg/1 and it should have been 280 ug/l, and the chart for index <br /> data has the data placed in the wrong columns. Please replace <br /> these pages in your report with the corrected pages. <br /> Sincerely, <br /> Larry Perino <br /> Reclamation Manager <br /> cc: EPA, Melanie Pallman <br /> Wally Erickson, DMG <br />