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December Monthly/4"' Quarter 1999 Report <br /> Page 3 <br /> In December, the lined interception/diversion ditch was extended along the northeast end <br /> of Tailings Pond No.4 as outlined in the December 21, 1999 progress report submitted <br /> by Sunnyside. Progress pictures for this project are attached. <br /> Cement Creek Diversion and Water Treatment <br /> Cement Creek diversion and water treatment was active throughout the month of <br /> December with the entire flow being diverted for treatment with the lower American <br /> Tunnel flow. <br /> The November and December, 1999 monitoring results for; dissolved metals in the AT- <br /> 004 discharge; Cement Creek (CC-113); American Tunnel flow before treatment (AT- <br /> INFEL); and Cement Creek below the AT-004 discharge point (CC-20) are attached. <br /> Mainstem Stream Monitoring and Reference Point Stream Monitoring <br /> Sunnyside sampled the reference point (A-72) and the other three gaging stations (A-68, <br /> C-48 and M-34) on December 1, 1999. The results from these samples are attached. <br /> The provisional flow at A-72 on December 1, 1999 was 179 cfs, which places this sample <br /> result in the intermediate flow category (100<Q<300cfs). The dissolved zinc value for <br /> this sample, obtained by averaging the results from two labs, was 519 ug/l. <br /> The index number for the December sample is calculated as follows: <br /> Xi = 519 <br /> Xf= 399 <br /> Sf= 144 <br /> Ni = (Xi—Xf) /Sf <br /> Ni = (519 — 399)/144 <br /> Ni = +0.83 <br /> The index number graph and updated reporting table are attached. <br />