12-20-2023 Council Packet - Laserfiche WebLink

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STAFF REPORT TO:Mayor Fischer and Members of the City Council FROM:Bill Dircks, Public Works Director DATE: December 20, 2023 RE:City Hall Basement Waterproofing ACTION TO BE CONSIDERED: Motion to approve awarding City Hall basement waterproofing work. BACKGROUND: One of the identified maintenance issues from the Kraus-Anderson facility analysis conducted in 2021 was City Hall Waterproofing. The basement of City Hall has had water intrusion issues in the for many years. The water intrusion has been sporadic, but has been an ongoing problem. In- house staff installed drain tile after the 1990 City Hall addition, but water continues to enter the basement from various points following rain events. Sometimes the water intrusion happens immediately after a rain event, and other times there can be a several days between a rain event and water entering the basement. This is likely due to the saturated soils and high water table surrounding City Hall. Even after a dry summer in 2023, we had a few heavy rain events in September and October and there was significant water intrusion from all sides in the basement. The basement is only under the original City Hall building, which includes the front office area, the offices, and the hallway to the right (west) of the front lobby area. The council chambers, conference room, kitchen, and history center are all constructed slab-on grade with no basement. Even though there is no basement in this area, upon inspection it was found that there is a back- pitch in the exterior grade that is causing the brick to deteriorate. The basement has two sump pumps, one on the east end and one on the west end. The one on the west end essentially pumps water from the bottom of the outside stairwell and the one on the east end is what the existing drain tile ties into. The drain tile only covers a small portion of the basement perimeter and is likely not functioning or functioning at a very low percentage of what it should be. The 2021 Kraus-Anderson facility assessment pointed out the basement water issues and suggested a project that involved digging around the outside of the building, adding drain tile, and waterproofing the outside of the building with a membrane. Staff contacted two basement specialists to discuss the issues and get quotes for the type of repairs each of them recommended. Staff has received two quotes and is working on additional details and options. An updated staff report with detailed information will be provided prior to the December 20 Council Meeting.