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Prepared by: Bolton & Menk, Inc. PROPOSED IMPROVEMENTS 2026 PMP Street & Utility Improvements ǀ 25X.137753 Page 12 It is recommended to utilize an In-Situ Vulink with a Rugged Troll 200 water logging device. This device will sit in an anchored Rugged Buoy near the deployable pump location in Karth Lake. The Rugged Troll 200 Data Logger is capable of monitoring surface water and will allow the city to monitor the water level of Karth Lake from an online application. The batteries included with the In-Situ Vulink will power the logger with a manufacturer estimated 10- year lifespan. a. Approximate Construction Cost: $10,000 Annual inspections of the system are recommended to keep the system operating as it should but battery replacement and an annual telemetry subscription are the only anticipated ongoing maintenance/costs over the life of the system. Option 2 Install a new 48-inch diameter, 6-foot deep concrete manhole structure to place the existing deployable pump in. Install a submerged 18-inch RCP skimmer pipe below the normal lake level to direct lake water from Karth Lake to the pump manhole while also mitigating the influences of wave action and wind on the water logging device. This installation to connect the system to the lake will require specialty installation measures to allow for installation of the culvert within the lake footprint, such as temporary steel sheet piling or similar. Install water monitoring logger and create automated on/off water elevation triggers. The existing ~350 GPM pump will be deployed from spring to fall and will operate automatically to maintain desired water levels. The pump will connect from the new location to the existing 6-inch forcemain that outlets to the gravity storm network on Cummings Park Drive. It is recommended to use the OTT PLS 500 Pressure Level Sensor. This water logging device will be housed in the manhole structure or stilling well. The OTT PLS 500 will be paired with a Sutron SatLink3, or approved equal, to log and transmit data. Power to the system will be supplied with 12V DC power from a solar panel. Electrical components needed include a 33 AH battery, 20W solar panel, solar regulator, equipment enclosure, mounting, and orifice line conduit. a. Approximate Construction Cost: $80,000 Annual inspections of the system are recommended to keep the system operating as it should but minor part replacements and annual telemetry subscription are the only anticipated ongoing maintenance/costs over the life of the system. Option 3 Install a new permanent lift station that includes an 18-inch skimmer pipe installed below the normal water level for Karth Lake, that directs water to a lift station vault with a permanent stormwater pump and potentially upgraded forcemain. This installation to connect the system to the lake will require specialty installation measures to allow for installation of the culvert within the lake footprint, such as temporary steel sheet piling or similar. This upgrade will also include a cloud connected water logging device and will likely require an upgraded electrical service to the lift station to provide adequate power for the proposed pump. To efficiently maintain a bounce of 0.5 feet in Karth Lake a new lift station was preliminarily sized with the limited information available to understand associated costs. The existing pumped flow rate of ~350 GPM was found to be inefficient and require pumping for extended periods of time to return Karth Lake to the ordinary high water surface elevation. This option includes upsizing the existing pump to quickly return Karth Lake to pre-rainfall levels and maintain a more consistent bounce. When installing a new pump, the existing 6- DRAFT