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January 1997 Monthly Report <br /> Page 4 <br /> - Mainstem Stream Monitoring and Reference Point Stream <br /> Monitoring <br /> Sunnyside sampled the reference point (A-72) on January 8, <br /> 1997. The BOR was scheduled to sample the other three <br /> mainstem stream monitoring sites A-68, C-48 and M-34. <br /> The measured flow (USGS) at A-72 for the January 8, 1997 <br /> sample was 55. 5 cfs which is in the low flow category (Q < 100 <br /> cfs) . The reported dissolved zinc value was 695 ug/1 which is <br /> the average of results from two labs. <br /> Index numbers for this result is calculated as follows: <br /> Xi = 695 <br /> Xf = 519 <br /> Sf = 124 <br /> Ni = (Xi-Xf)/Sf <br /> Ni = (695-519)/124 <br /> Ni = 1 .42 <br /> The index number graph and updated reporting table are attached. <br /> Evaluation of the normalized data: <br /> The index value of 1.42 for January indicates this result was <br /> significantly higher than the mean value for the reference data for <br /> the low flow class. While this result is less than 2 and does not <br /> require reanalysis, further evaluation or additional sampling, it <br /> is of concern that two consecutive low flow samples are in the <br /> upper range that could be expected as compared to the reference <br /> data set. If this trend continues, it may require evaluation. <br /> Please contact me if you have any questions on this report. <br /> Sincerely, <br /> Larry Perino <br /> Reclamation Manager <br /> cc: EPA - Melanie Pallman <br /> Technical Enforcement Program 8ENS-T <br /> DMG - Wally Erickson <br /> Allen Sorenson <br />