2016.03.22 CC Minutes - Laserfiche WebLink

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March 22, 2016 Page 9 of l 1 ex ansion to the existing plant known at Water Treatment Plant #1 (WTP1) at 3001 5th Street l P NW. Zoning Code Section 4-030(2) states that service structures, public or private, including deep wells, elevated tanks, and similar structures and uses are specially permitted uses within the R— 1, Single Family Residential zoning district. Lastly, a Site Plan approval is necessary in order to secure building permits for these improvements. The request entails the following: • Construction of a new 38' x 60' freestanding building to be known as the Distribution Control Station (DCS). This building will be located at the south end of the existing driveway into the site. • Construction of an expansion to WTP 1, measuring no larger than 65' x 95'. This expansion will house the new technology for the treatment of 1, 4 -dioxane, which will be used in conjunction with the existing treatment systems within the plant. • Various supporting utility and landscaping improvements. Assistant Director of Community Assets and Developinen0lannmg Director Gundlach reported a full analysis of all Site Plan and Special Use Permit criteria is provided in the written Planning Report. The Planning Commission reviewed this material and found all standards have been met and recommended approval consistent with the staff recommended conditions. The purpose of this item is to advance the project to the next step, which is to publicly advertise for bids. Bids are tentatively scheduled to be opened on April 20, 2016, with construction to begin in May, 2016. Assistant Director of Community Assets and Development/Planning Director Gundlach indicated the project (defined as Contract Package 1 in Barr Engineering's Work Order 2) consists of the construction of a Distribution Control Station (DCS), Minneapolis interconnection pipeline, and various site utility modifications. A temporary water supply system is also included, which will allow New Brighton to be interconnected to Minneapolis by July 2016. The purpose of this design package will provide readily available emergency backup water supply, provide enhanced functionality for water sourcing and disposition, clear the site to enable WTP 1 expansion to proceed rapidly, and preserve WTP1 expansion space by constructing distribution control functions in a separate location (e.g., not within WTP 1). Community Assets and Development Director Schlichting stated the DCS well house piping, booster pumps, valves, a chemical feed room (for future use if required), an electrical equipment room, and an air -gap tank. The DCS will enhance current functionally by allowing the City to choose its water source (WTP1 or Minneapolis) and where water will be sent (distribution and/or ground storage reservoir or air gap tank for storm or sanitary discharge). The current booster pumps that provide water to the high zone tower will also be relocated to this building. The interconnection pipeline will be tied into a Minneapolis 48 -inch steel watermain. A shut-off valve (manual) will be installed near this tie in and will be operated by Minneapolis. From the tie in, the pipe will route through Minneapolis and New Brighton property to the DCS. Community Assets and Development Director Schlichting commented that due to the anticipated construction time required to substantially complete this DCS, a temporary water supply system will be constructed. A tee from the main interconnection pipeline will allow water to be directed into WTP 1 where temporary water supply pumps prepurchased by the City) will be installed. Water discharged from these pumps will tie into New Brighton's existing distribution system. The purpose of this temporary system will allow the City to obtain water from Minneapolis earlier in the 2016 season, and will allow the contractor to complete the DCS without having to work around operational water supply equipment. Various utility modifications will also be required as part of this project. They include modification of the