2010-10-13 CC Packet - Laserfiche WebLink

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Dallas Larson Administrator City of Centerville 1880 Main Street Centerville, MN 55038-9794 Re: Downtown Storm Water Reclamation Project City of Centerville Bonestroo File No.: 000616-08167-0 F6 �-1 � In lieu of recent changes to the project approach, we have prepared the following scope and fee revision for the design and bidding of the Downtown Storm Water Reclamation Project. BACKGROUND In June of 2010, we were authorized, by the City Council, to perform a preliminary survey and begin the design of the storm water reclamation project. The project was to consist of a supply line from the Anoka County pond i to a wet well with a pump and controls. From there, a sprinkler system was to irrigate the grounds at Laurie LaMotte Memorial Park. The design of that system was to be consistent with other systems we and our partner consultants have designed in the past using golf course and athletic field grade sprinkler heads. In recent weeks, you have asked us to attend meetings with a distributer of an alternative style sprinkler head used primarily in the agricultural industry. This distributer has provided product specs and conducted a live demonstration of the product. After City staff and elected officials attended this demonstration, it appears that they have gained some comfort level with utilizing these heads in a communilty park setting. Moving forward, we understand that the City may wish to use this, product in lieu of the more traditional systems. In speaking with the product representative, we understand that this product is rarely used in a fixed location, more often being attached to a mobile apparatus. There are no available installation guides or manufacturer's recommendations for this set-up, requiring us to design a unique system to allow proper operation in this application. The intense forces produced by a sprinkler shooting nearly 500 gallons per minute (gpm) at a pressure of roughly 100 pounds per square inch (psi) will require our design to be reviewed by a structural engineer. W.