06-23-25-SWS - Laserfiche WebLink

Home Browse Search

Prepared by: Bolton & Menk, Inc. PROPOSED IMPROVEMENTS 2026 PMP Street & Utility Improvements ǀ 25X.137753 Page 13 inch force main will likely need to be upsized to handle the increased flow rate, but additional evaluation will be required based on the selected improvements. The electrical service will also need to be upgraded to provide sufficient power to the pump. The pump will be placed in a concrete vault along with an automated water surface float. This float will trigger the pump on and off according to preset water levels. This is the most robust and expensive of the options but provides the greatest benefit to the residents of Karth Lake and the city. b. Approximate Construction Cost: $500,000+ Annual inspections of the system will be required and ongoing maintenance/costs will be similar to other lift stations throughout the city. It is assumed that if this option were selected, City Public Works staff would provide information on components utilized on existing lift stations throughout the city to provide seamless integration and operation for staff. If selected, a more thorough analysis of the existing system, required pump size, required electric needs, and whether the forcemain requires replacement or not will be required. Understanding long lead times for control panels, it should be noted that this option will likely take in the neighborhood of 18 months to construct, depending on final selections. Conclusions While Option 3 is the best option for monitoring and operation, it also comes with significantly higher construction costs than the other options. Options 1 and 2 both provide cost-effective improvements that can be implemented with relative ease. All three options can be further customized to meet the city’s needs and final costs will depend on the options selected, including preference for cellular or satellite telemetry. While the city’s current operations meet the requirements of their permit, it is difficult for the limited city resources to always stay apprised of the current lake conditions and needs. Therefore, improvements could be made to alleviate staff time allocated to monitoring the lake elevation and/or pump deployment/removal and free that time up for other important city services. And improvements would help to meet the request of the KLID board to better manage the lake elevations to a more restrictive level than is required under the city’s permit requirements. The City and the KLID board should have discussions on potential cost sharing options and what improvement option best fits with the goals of each organization. The selected option will be further evaluated and incorporated into the final design of the project. Costs for these improvements are not included in the base project costs but are separated out as options for the City’s consideration. Trails Given the thin existing trail section, reclamation of the trails is not recommended. The proposed trail improvements for select trail segments in Cummings Park include removal of the existing bituminous pavement (where applicable), supplementing the existing remaining gravel as needed to construct the proper aggregate base section, and repaving the trails with new bituminous on the aggregate base materials. For the identified segment of existing trail that is only gravel, it will be top-dressed with additional reclaim material as necessary, graded, and paved to provide access to the Karth Lake pump station. The trail replacement limits were extended west to the Cummings Park entrance due to damage anticipated with construction access to the Karth Lake pump station and the proposed new stormwater pond. The trails are proposed to be replaced, in kind, matching the existing trail alignments, widths, and elevations except where improvements make sense to improve drainage patterns. Due to the existing site topography, some segments of these existing trails appear DRAFT