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ARDEN HILLS CITY COUNCIL WORK SESSION — MAY 27, 2025 21 Public Works Director/City Engineer Swearingen said he can request Bolton and Menk to do some further modeling and hydrant testing within this design. The water modeling would take two weeks to coordinate. Mayor Grant asked for confirmation we would add two weeks to the entire thing. Public Works Director/City Engineer Swearingen confirmed. Mayor Grant said once they get started after they have resources. If we tell TCAAP this will take 3-6 months, that would be an issue. Councilmember Holden asked if we have talked to the fire department. She thinks the complaints of low pressure has gone away since the Roseville connection was completed. Mayor Grant said the Roseville connection and there was another on Bethel. He thinks the Bethel redundancy was put in prior to that study. Public Works Director/City Engineer Swearingen confirmed. That Bethel watermain line was put in in 2018 and the study was done in 2019. Mayor Grant said if it's only a two week effort, there can't be that much cost. Public Works Director/City Engineer Swearingen said it can depend on if they have existing data they can plug in. Councilmember Weber repeated that he does not want to see a model where they are saying it may or may not be correct. He understands caveating your work with some protection, in case you're wrong. This is a big investment for our city. Mayor Grant added we have a higher residential level than previously. That changes things. He doesn't know if commercial or residential use more water. Councilmember Weber thinks it's commercial. That may be why they downgraded the size of the tower. Multi -family aren't always watering lawns but almost all commercial properties do all the time. Mayor Grant would like to be updated with the overall cost of trunk utilities, tower and anything else that is in the Joint Powers Agreement, that is City responsibility and expense. It's been several years since he's seen updated numbers. Public Works Director/City Engineer Swearingen just got the latest trunk utilities estimates this morning. This is based off of the latest 60% design. The watermain trunk utilities is just over $1.25 million. He said a 20% contingency should be added to utility numbers. The sanitary sewer trunk main is $2.6 million. That includes the lift station. The water tower is $7 million. The Roseville trunk main improvement is up to $800,000. Councilmember Holden asked what size the water tower is. Public Works Director/City Engineer Swearingen said 0.75.