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�LHCRIUG 4ISSO(I41T[S TAUT: HAM Memo TO: Honorable Mayor & City Council Members FROM: Lee Elfering, City Engineer DATE: June 25, 2014 RE: Tower Valve Replacement & Noel Drive Sidewalk Connection Tower Valve Replacement The Water Tower project is moving along as anticipated and should be completed in the next 3 to 5 weeks. While the work is being completed the tower has been isolated from the City's water system and drained. Shortly after isolating the tower to begin the project it was discovered that the valve between Noel Drive and the Water Tower does not completely seal. While a small pump is sufficient to allow work to continue in the Water Tower this valve should be replaced and this is the opportune time to complete its replacement since the water tower is already off-line and drained. We are recommending that the Tower line be excavated and a new valve be installed between the existing valve and the Water Tower at this time. The exact depth of the watermain as it runs between Noel Drive and the Water Tower is unknown and it is possible that there could be impacts to the existing retaining walls. We have not obtained pricing from Contractors for this work, but estimate the cost could be $10,000 to $15,000 depending on the amount of disturbance and the location of the valve installation. Noel Drive Sidewalk The installation of sidewalk along Little Canada Road and pedestrian movement around City Hall spurred discussions at staff level regarding the need for a connection between the Little Canada Road sidewalk and the trail system along Gervais Creek and Gervais Mill Park. There is not sufficient right-of-way along the west side of Noel Drive for a sidewalk installation, however; a sidewalk connection along the east side of Noel Drive is possible and seems to provide a needed connection of these two systems. There are some challenges associated with this route, specifically the steep grades and retaining walls between the Park and City Hall driveways. A proposed route for a 6 -foot sidewalk with a 6 -foot boulevard is shown on the attached exhibit. Two options are shown for extending the sidewalk from the Gervais Mill Park parking lot to the trail on the northwest side of the creek. The sidewalk would require significant modifications and additions to the existing retaining walls along Noel Drive. Depending on the final sidewalk alignment we would estimate retaining wall work in the range of $50,000 - $80,000 to accommodate the new sidewalk. The costs for the 10062 Flanders Court NE — Blaine, MN 55449 — Ph: (763) 780-0450 Fax (763) 780-0452 Memo -062514 -CC (Valve Replacement Noel Sidewalk).doc