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December 1996 Monthly/4th Quarter Report <br /> Page 4 <br /> - Cement Creek Diversion and Water Treatment - Cont <br /> The flow and quality of CC-20 is not the same as the AT-004 <br /> discharge due to flow from seeps and springs entering the <br /> creek channel between the treatment diversion point and the <br /> treatment discharge point and due to the diversion of excess <br /> water from Minnehaha Creek to Cement Creek. Minnehaha Creek <br /> water is used for reagent mix water and more water is diverted <br /> than needed to keep the lines from freezing in the winter and <br /> plugging with debris in the summer. This excess water is <br /> diverted to Cement Creek. The additional water at CC-20 <br /> appears to average approximately 30 GPM when Cement Creek is <br /> being totally diverted through the treatment system. <br /> - Mainstem Stream Monitoring and Reference Point Stream <br /> Monitoring <br /> Sunnyside sampled the mainstem stations on December 13 , 1996 <br /> in addition to the reference point (A-72) sample. Results for <br /> this sample session as well as the November 7, 1996 session <br /> are attached. <br /> It has become apparent from the data, that flows based on the <br /> USGS gaging station staff gauges and shifts for September <br /> through January are not accurate. Therefore, flows values <br /> will have to be adjusted when the USGS completes their review <br /> and finalization of flow data. A request was made of USGS to <br /> review A-72 flow data from September through January on the <br /> sample dates and times and provide provisional flow rates. <br /> The flow rates in the summary data sheet for A-72 have been <br /> changed to reflect the provisional values obtained from the <br /> USGS. As a result, the November flow originally thought to be <br /> 108 cfs is now reported as 92 cfs. This will shift the zinc <br /> analysis for this sample result to the low flow category (Q < <br /> 100 cfs) . The reported dissolved zinc value was 535 ug/1 <br /> which is an average of the results from two labs. <br /> The provisional flow for the December 13 , 1996 sample <br /> (obtained from the USGS) was 97 cfs which is also in the low <br /> flow category. The reported dissolved zinc value was 705 ug/l <br /> which is the average of results from two labs. <br /> The measured flow (USGS) for the January 8, 1997 sample was <br /> 55. 5 cfs which will also be in the low flow category. <br /> Analytical results have not been received and will be included <br /> in the February report submittal . <br />