10-27-14-WS - Laserfiche WebLink

Home Browse Search

Memorandum Date:October 27, 2014 To:Terry Maurer, Public Works Director From:Thomas J. Lincoln, Kimley-Horn Matt Bowers, Wenck Subject:TCAAP Water and Sanitary Sewer Systems Design Update The purpose of this memo is to provide an update on the preliminary design process for the water and sanitary sewer system design that Ramsey County has initiated for the TCAAP site. Design Development Scenario Water demand has been calculated to serve as a basis for the design of the water and sanitary sewer system. This water demand calculation has been based on the maximum design development scenario outlined below: x 1700 residential dwelling units x 550,000 SF of retail x 1,450,000 SF of general office x 350,000 SF of warehouse x 150,000 SF of general light industrial Water System Design The water system design has two major tasks - developing a water model for the City and designing a water system that will provide the domestic and fire flows for the design development scenario. Water System Modeling x Data was collected for the existing Arden Hills water system, including the pipe network, water towers, booster station, and water demand data from Arden Hills and the City of Roseville. Based on data from recent years, the average day demand is currently 1.25 million gallons per day (mgd). The model uses 1.5 mgd for the ultimate build-out within the existing Arden Hills area, which allows 20% for future growth. x The water model for the existing system was then constructed and checked against actual data that is available for the existing system (e.g., measured water system pressures and fire flows). Preliminary Water System Design x A system of PVC water mains throughout the TCAAP development area were added into the water model. The additional water demand (approximately 0.75 mgd average day demand) was added onto the model, distributed in general accordance with the land use type. Finally, target