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S <br /> February 1997 Monthly Report <br /> Page 4 <br /> - Cement Creek Diversion and Water Treatment Cont <br /> Attached are results from flow and quality monitoring of; <br /> Cement Creek diverted for treatment (CC-1B) ; American Tunnel <br /> flow before treatment (AT-INFEL) ; dissolved metals analysis of <br /> the AT-004 discharge; and Cement Creek below the AT-004 <br /> discharge point (CC-20) . <br /> As explained in the December report, there was approximately <br /> 20-30 GPM more flow at CC-20 than being discharged from the <br /> AT-004 discharge point. This water is made up of excess <br /> reagent mix water being diverted for the water treatment <br /> system from Minnehaha Creek and seeps and springs entering the <br /> creek bed between the diversion point and the CC-20 monitoring <br /> point. <br /> - Mainstem Stream Monitoring and Reference Point Stream <br /> Monitoring <br /> Sunnyside sampled the reference point (A-72) on February 5, <br /> 1997 as well as the other three mainstem stream monitoring <br /> sites A-68, C-48 and M-34. These results are attached. <br /> The provisional flow from the outside gage at A-72 for the <br /> February 5, 1997 sample was 92 cfs which is in the low flow <br /> category (Q < 100 cfs) . The reported dissolved zinc value was <br /> 700 ug/l which is the average of results from two labs. <br /> Index numbers for this result is calculated as follows: <br /> Xi = 700 <br /> Xf = 519 <br /> Sf = 124 <br /> Ni = (Xi-Xf)/Sf <br /> Ni = (700-519)/124 <br /> Ni = 1 .46 <br /> The index number graph and updated reporting table are attached. <br />