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January Monthly Report - 2001 <br /> Page 3 <br /> Cement Creek Diversion and Water Treatment <br /> Cement Creek diversion and water treatment was active throughout January. The entire <br /> Cement Creek flow was diverted for treatment and all of the American Tunnel flow was <br /> treated throughout the month. <br /> The January 2001 monitoring results for; dissolved metals in the AT-004 discharge; <br /> Cement Creek (CC-1B); American Tunnel flow before treatment (AT-INFEL); and <br /> 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) on January 3' . The results for this sample <br /> are attached. <br /> The provisional flow at A-72 on January 3, 2001 was 68 cfs, which places this sample <br /> result in the low flow category (Q<100cfs). The dissolved zinc value for this sample, <br /> obtained by averaging the results from two labs, was 769 ug/l. Because the results from <br /> the two labs varied more than normal, this result is preliminary and might change if the <br /> results change after the labs rerun their samples. <br /> The preliminary index number for the January sample is calculated as follows: <br /> Xi = 769 <br /> Xf= 519 <br /> Sf= 124 <br /> Ni = (Xi — Xf) /Sf <br /> Ni = (769— 519) /124 <br /> Ni = +2.01 <br /> The index number graph and updated reporting table are attached. <br />