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The Karth Lake Improvement District (KLID) consists of Karth Lake’s lakefront property owners. The KLID board developed the Karth Lake Management Action Plan and through consultation with the Rice Creek Watershed District (RCWD), have completed studies which have collectively identified various improvements in and around Karth Lake. Karth Lake does not have an emergency overflow route and would lead to flooding without management of the lake levels. A pump was installed and is operated by the city to manage the lake level within an approximately 2-foot bounce level. The KLID modeled the pump operations and has made a recommendation to revise operations to limit the lake to a 6-inch bounce level. Options to implement this improvement to the pumps will be evaluated during the feasibility stage of the project and the selected option will be incorporated during final design. Additional improvements identified to Karth Lake include a stormwater BMP retention pond to be constructed at the southeast side of the lake to treat surface water runoff from Cummings Park prior to entering the lake, retaining wall replacement to alleviate erosion into the lake surrounding the failing timber retaining wall near the outlet pump, and installation of sump structures with SAFL baffles to the last storm structure in the street prior to outletting to the lake at the two locations currently without pretreatment. Each of these three items are expected to be eligible for RCWD grants and applications will be developed to assist with potentially obtaining said funds as part of the project process. RCWD rules will require consideration on the project, though based on the project being primarily rehabilitated, we understand these rules will not have a significant influence on the project design given the proposed scope. Bolton & Menk’s project team will work to identify what potential additional BMP measures will be required based on their rules and how they apply to the project. In addition to reviewing the project documentation, we have visited the site and considered the roadway rehabilitation process, the existing curb and gutter, pavement condition, and drainage improvements. Based on review of the National Wetland Inventory (NWI) and Public Waters Inventory (PWI), wetland delineations and associated permitting will be necessary for the sediment removal work and the other storm sewer improvement work in/around Karth Lake. Additionally, our site visit indicated a few specific locations to be analyzed further during the project development: • Potential drainage issues, particularly in select segments of existing curb and gutter • Significant pavement deterioration in areas that may require additional subsurface evaluations • Potential realignment of the trail crossing on Cummings Park Drive We understand communication is critical in all aspects of the project. We will follow the city’s public involvement process and work closely with city staff throughout all project phases to keep you informed and educated on the design taking place. We will provide requested updates to the city council and work with residents from preliminary design through construction to help assist with their questions and specific needs. We also understand the city’s desire to minimize consultant amendments, and as such, we invested significant due diligence in preparation of this proposal in hopes of flushing out potential changes before they ever occur. It is never our goal to encumber additional services on a project. Our project team strives to achieve a successful but unsurprising project delivery process. Ka r t h L a k e Ka r t h L a k e N ursery Hill Lane Amble RoadArden View Cour t Wynridge Driv e W y n c r est Lane W y n c r e s t C o urt Indian Oaks Trail A mble Drive Karth Lake Drive Pleasant Circle Innovation Way Cummings Park Drive Quality Drive K a r t h L a k e C i r c l e Pl e a s a n t D r i v e Pleasant DriveNursery Hill Lane Amble RoadArden View Cour t Wynridge Driv e W y n c r est Lane W y n c r e s t C o urt Indian Oaks Trail A mble Drive Karth Lake Drive Pleasant Circle Innovation Way Cummings Park Drive Quality Drive K a r t h L a k e C i r c l e Pl e a s a n t D r i v e Pleasant Drive 51 50 96 Karth Lake ParkKarth Lake Park LEGEND Existing Trails Street Project Area Trail Project Area 5 2026 PMP STREET AND UTILITY IMPROVEMENTS | CITY OF ARDEN HILLSProject Understanding EXHIBIT A