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Prepared by: Bolton & Menk, Inc. PROPOSED IMPROVEMENTS 2026 PMP Street & Utility Improvements ǀ 25X.137753 Page 5 generally in a deteriorated condition with significant surface delamination and cracking throughout. Other surrounding trails have received more recent maintenance operations are in acceptable to good conditions. The existing trail back to the Karth Lake pump station is only gravel and contributes to erosion in the area. Cores with shallow borings and a geotechnical evaluation were completed throughout the project area by Braun Intertec and the report is included in Appendix F. The existing bituminous trail thickness is generally around 2-inches with the existing aggregate base thickness generally around 2-inches as well. Retaining Wall An existing retaining wall surrounds the Karth Lake pump station and electrical box. It is a three-tiered timber retaining wall that is in poor condition and contributes to erosion along the steep bank slopes into Karth Lake. IV. PROPOSED IMPROVEMENTS Streets There are two street pavement rehabilitation methods proposed for this project that are based on roadway age, surface deterioration, PCI ratings, and subgrade soils. Streets will be rehabilitated with either a full depth reclamation or mill and overlay based on recommendations from the geotechnical report. Full depth reclamation is a process that pulverizes the existing roadway pavement and mixes it with the existing underlying aggregate material to create a new suitable aggregate base material. The reclaim material is graded and recompacted for the proposed roadway with excess material being hauled away and 4-inches of new bituminous pavement installed in two lifts. A mill and overlay is a process that grinds off the top layer of bituminous pavement and approximately 2-inches of new wear course bituminous pavement is installed over the remaining base bituminous pavement. Both rehabilitation methods will include spot curb and gutter replacements, select base pavement repairs and/or subgrade corrections, and casting or valve box adjustments to the new pavement grade. The spot curb and gutter replacements will be utilized to address sunken or severely damaged curb throughout the project area that inhibits proper drainage. No driveway work is proposed, except as necessitated by spot curb replacements or utility work. All disturbed boulevard areas will be restored with 5-inches of topsoil and new sod or seed and blanket. Select street signs and street name blades are identified for replacement based on a city inventory completed in the summer of 2025. Based on the observed weathering and deterioration found in the pavement cores and soil borings, a 2-inch to 2.5-inch mill and overlay is proposed for the following street: • Karth Lake Circle from Hamline Avenue (CSAH 50) to the south cul-de-sac Based on the observed weathering and deterioration found in the pavement cores and soil borings, an 8-inch to 10-inch full-depth reclamation is proposed for the following streets: • Karth Lake Drive from the west cul-de-sac to Pleasant Drive • Pleasant Drive from Amble Drive to the north cul-de-sac • Pleasant Circle from the west cul-de-sac to Lexington Avenue (CSAH 51) • Amble Drive from Karth Lake Drive to Lexington Avenue • Amble Circle from Amble Drive to the north cul-de-sac • Cummings Park Drive from the west cul-de-sac to Lexington Avenue DRAFT