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t <br />v I i . DIJUDE5 <br />A. 3-.0yQ_SQiiac±iDD-faciilti-Q-5 <br />A computer program wl.:--. ' vel oped usi ng the "grav Ity sans tary <br />sewer design and co_-., :-uction" manual requirements as prepared <br />by the American Society of Civil Engineers (ASCE) and the Water <br />pollution Control federation (WPCF) . Avai I able information <br />regarding current and proposed future sanitary sewer and water <br />f I ow for the sans tary sewer sery ice area was uti I ized. <br />Currently, the lift station at the southwest corner of County <br />Road C and Snel I ing Avenue, which serves the area, is calculated <br />as pumping an average of 0.133 mgd compared to the 0.159 mgd <br />f Igure as estimated by the ASCE program under existing <br />conditions. <br />Future f low conditions were estimated based on full development <br />of the service area and the addition of the Life and Health <br />Fitness Center and the new residence hale at Northwestern <br />the <br />College. Because of the f I at sl ope on th stretch <br />sewer Just downstream of the current Northwestern <br />A <br />sanitary <br />College service line which limits the pipe capacity, the Life <br />and Health Fitness Center is proposed to connect to the existing <br />sanitary sewer line at the next downstream manhole as shown on <br />Exhibit G. <br />The total peak flow is estimated based on multiplying the <br />cumulative f I ow by a peak factor determined by the cumulative <br />equivalent population. As population increases, the peak factor <br />w i I I decrease. <br />The future f I aw predictions show two areas where total peak f I ow <br />The sanitary <br />is predicted to be larger than existing capacity. <br />sewer f I ow just downstream of Russel I Court and the Northwestern <br />to have a <br />Col Iege area along Lydia Avenue, is estimated peak <br />f I ow 2% greater than capacity. The next I i ne downstream, <br />starting 300 feet west of Russel I Court, is estimated to have a <br />peak f I ow 8% greater than capaci ty. <br />We do no expect problems to arise from these predictions <br />t exp any <br />for several reasons: <br />1. Our predicted f lows tend to be very conservative. Al I <br />f I ows used i n the cal cul ations are the highest to be <br />expected. <br />2. Fu l I development of the area, Including full use of the <br />sewer system, may never occur. These two reasons probably <br />account for our predicted current flow being 20% less than <br />the actual calculated f I ow . <br />3. Pressure flow for a very short period of time should have <br />a negligible Impact on the system. <br />P <br />1 -15- 8621 <br />