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i RAMSEY ItTCAAP Site Redevelopment y COUNTY ARZI xI ILLS //A" Infrastructure Preliminary Water System Design • After calibration is completed, the system of PVC water mains throughout the TCAAP development area will be added onto the water model and a northerly extension of the existing system • The water model will be used to help answer these questions: o What size water mains are required? o Can the peak day demand be delivered through the existing Arden Hills system? o Is an additional water tower needed? What location, size, and height? o Does the existing pressure boosting station need to be upsized, and/or should a second pressure boosting station be added at a different location? o Collectively,the above questions feed into the key design parameters of providing reliable system pressures and minimum required fire flows. o In addition, can the State facilities to the north of the thumb be served from Arden Hills? (These facilities are currently served by the City of Mounds View.) • After the above questions are answered and the recommended infrastructure is finalized, these additional preliminary design tasks will be completed: o Prepare a detailed cost estimate of the water system infrastructure including water main throughout the TCAAP development, any looping/interconnections, any upsized and/or added booster stations, and any water tower. o Prepare a MN Statutes Chapter 429 Feasibility Report o Prepare a maintenance needs spreadsheet (man-hours and equipment) o Evaluate if special construction and/or maintenance issues exist in any TCAAP areas due to the presence of groundwater contamination and if so, provide recommendations and estimated additional construction/maintenance costs. • Special considerations for providing early water service to the "thumb" development: Option 1: Mounds View provides water to the "thumb". It is not clear if this option would provide enough fire flow for the TCAAP "thumb" development. A second connection to the Mounds View system under 1-35W would be likely. Option 2: Arden Hills builds the water system for the TCAAP"thumb" and takes over providing water for the MnDOT properties. The Arden Hills system would connect to the existing 10-inch DIP Mounds View water main to provide an emergency connection. Option 3: Mounds View would provide temporary water supply to the TCAAP "thumb". When Arden Hills builds the TCAAP system it would take over the temporary system and also take over providing water for the MnDOT properties. Again, it is unlikely this temporary system could provide adequate fire flow for the TCAAP "thumb" development under the temporary condition, but the Arden Hills system would be designed for adequate fire flow at the point of take over. Sanitary Sewer System Design The sanitary sewer system design has two major tasks-determining design flows and capacity and designing a sanitary sewer system for the design development scenario. The TCAAP site will be served 2