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II II II II II il II il II would have to pumped into the reservoir from the ditch. Also the present diversion structure would require e~tensive modifications for wintertime operation. It is proposed to construct a new diversion structure near the initial settling reservoir and associated pump station to deliver water into the reservoir. The new diversion structure would be de6igned for wintertime operation and the pump station with short pipeline to reservoir would cause no ice problems in the winter months. Exhibit No. 7 snows the tentative location for these facilities. The 1973 estimated cost as shown in Section 6 for the diversion structure is $281,000 and for the pump station to deliver water into the reservoir is $105,000. Proposed Modifications to Settling Basins. II With the construction of the initial settling reservoir the need for a primary settling. basin at the treatment plant is eliminated. It is proposed to use a flash mixer to add chemicals to the raw water prior to it entering the first settling basin. This first basin would then act as a flocculation basin. II It is also proposed to improve the effiCiency of the second settling basin in which the flow presently snakes in and out the whole 400' length of basin causing currents and non-uniform velocities which hinders effective sedimentation. It is proposed to introduce the flow into this basin along the entire south side. Flow would be to the north over the 115' width of the basin. Effluent would be collected along the north sLde by means of a weir and discharged into the existing 48" pipe running to the filters. II II II rI These modifications along with the p!esedimentation that will occur in the initial settling reservoir will eliminate problems that presently exist during periods of extremely high raw water turbidity. II J J 1 The 1973 cost estimate for these modifications as shown in Section 6 is $124,500. 4-4