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November 1999 Monthly Report <br />Page 3 <br />Cement Creek Diversion and Water Treatment <br />Following notice, Cement Creek diversion and water treatment was suspended on June 1, <br />1999. Monitoring results through September had not revealed a reason to resume <br />treatment. Sunnyside continued to evaluate whether resumption of Cement Creek <br />diversion and treatment should occur through October. Due to unusual precipitation <br />conditions that Sunnyside had observed in Cement Creek during the summer and fall, <br />Sunnyside, on a temporary basis, resumed Cement Creek diversion and treatment on <br />November 22, 1999. <br />The November, 1999 monitoring results for; dissolved metals in the AT -004 discharge; <br />Cement Creek (CC -1); American Tunnel flow before treatment (AT- INFEL); and <br />Cement Creek below the AT -004 discharge point (CC -20) were not received by the date <br />of this report. They will be submitted with the December report. <br />Mainstem Stream Monitoring and Reference Point Stream Monitoring <br />Sunnyside sampled the reference point (A -72) on November 3, 1999. The results from <br />this sample are attached. The Bureau of Reclamation sampled the other three gaging <br />stations (A -68, C -48 and M -34). <br />The provisional flow at A -72 on November 3, 1999 was 201 cfs, which places this <br />sample result in the intermediate flow category (100 <Q <300cfs). The dissolved zinc <br />value for this sample, obtained by averaging the results from two labs, was 697 ug/l. <br />The index number for the November sample is calculated as follows: <br />Xi = 697 <br />Xf = 399 <br />Sf = 144 <br />Ni = (Xi — Xf) /Sf <br />Ni = (697 — 399) /144 <br />Ni = +2.07 <br />The index number graph and updated reporting table are attached. <br />