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c <br /> reservoir must be operated at levels above the spillway concrete (i.e. stored <br /> behind the steel spillway gate). <br /> 3. There is still a level of uncertainty in the seepage flow rate from Dam 1 that <br /> can only be characterized after a few years of operation. Oversizing the <br /> capacity until that determination can be made is prudent. <br /> PIPELINE <br /> The size of the pipeline was reduced from 20-inch diameter to 18-inch diameter as <br /> a result of the reduced pumping requirements. This reduces the design capacity of the <br /> pipeline to approximately 5,500 gpm and is governed by pipeline pressure constraints. If <br /> the pipeline size is reduced further, then the flow velocity in the pipeline exceeds 10 feet <br /> per second with two 629 pumps operating, which is not recommended at this installation. <br /> Also, the added friction loss in a smaller pipeline may result in the need to install larger <br /> motors on the 629 pumps, which would result in additional cost for the motors and <br /> electrical system. <br /> As requested at the meeting, an additional pipeline access vault was added to the <br /> design. This vault would be located near the proposed pump station and would contain <br /> an access tee with a blind flange. Drawing No. 1051.156-2 was revised to reflect the <br /> revised pipe size and the addition of the vault. <br /> PUMP STATION DESIGN <br /> The preliminary design of the pump station was modified to include only two 629 <br /> pumps and space for possible future expansion to three pumps. As a result, the building <br /> size was reduced from 24 x 36 feet to 22 x 30 feet. The modified general arrangement <br /> of the pump station is shown on the revised Drawing No. 1051.158-1. <br /> 3 <br />