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Jim Studenski, P.E. City of Lino Lakes, Minnesota Century Farms Lift Station • May 7, 2003 Page 4 • Note: The type of power supply (e.g., 3 -phase or single - phase, voltage requirements) required for this lift station is important and should be addressed immediately during the final design of the lift station. Projected Future Lift Station Modifications As housing development progresses past the 2007 service conditions, the Century Farm Lift Station will require the following general modifications: 1. As the number of housing units in the service area approaches 400 to 500, increase the pumping capacity of the lift station. This may be accomplished by replacing the existing pump impellers with larger ones. The amount of increased pumping capacity depends upon the specific pump type that is originally selected. 2. As the number of housing units approaches the Ultimate Service Conditions, increase the pumping capacity of the lift station to a peak capacity of 1,000 gpm. This will be accomplished by adding a third submersible pump creating a tri-plex system. The other two pumps may also have to be modified so that if any one of the three pumps fail, the two remaining pumps can maintain a peak capacity of 1,000 gpm. Other lift station modifications for the Ultimate Service Condition include: • Setup a temporary bypass prior to beginning the lift station modification work. • With the addition of the third pump, replace the existing pump controls and floats with new systems. • Remove the existing 6 -foot diameter barrel section from the bottom of the 10 -foot diameter lift station structure. • Add a third discharge pipe from the lift station to the 10 foot diameter valve manhole. • Add a new third set of check and plug valves inside the existing valve manhole. Inside the valve manhole connect the 3rd discharge pipe to the existing 8 -inch forcemain. If you have any questions, or wish to discuss this analysis further, please feel free to contact me. Sincerely, Aaron D. Hass, P.E. Project Engineer ADH:art Enclosures: Exhibit "A" cc: Scott Brink, P.E., TKDA, with enclosure Bob Stark, P.E., TKDA, with enclosure Paul Blum, P.E., TKDA, with enclosure