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07-24-23-R
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07-24-23-R
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7/24/2023 6:10:07 PM
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Prepared by: Bolton & Menk, Inc. PROPOSED IMPROVEMENTS <br />2024 PMP Street & Utility Improvements ǀ 0T1.130168 Page 7 <br />city easement (the rest of the pond is located on private property). It should be noted that only <br />dredging a portion of a pond will likely lead to redistribution of the accumulated sediment <br />from other portions of the pond over time and the entire pond will still require dewatering to <br />perform the work. <br />Braun Intertec completed pond sediment sampling from the ponds to characterize the in-place <br />sediment (future dredge material). These sediment samples were tested and evaluated in <br />accordance with Minnesota Pollution Control Agency (MPCA) standard procedures as <br />described in Appendix B of Managing Stormwater Sediment BMP Guidance for <br />Municipalities. Based on analytical results from the sampling and testing, excavated <br />stormwater sediments from the identified ponds fall within the Residential/Recreational SRV <br />management category and may be used with no restrictions. <br />To determine the volume of accumulated sediment, a bathymetric survey was completed for <br />each of the stormwater ponds. This process involves taking measurements at various <br />locations throughout pond to determine the top of sediment and then pushing through the <br />sediment to the approximate original pond bottom. The difference between these <br />measurements provides an estimate of the accumulated sediment volume to be dredged out of <br />the pond. Similar to the backyard storm sewer improvements identified above, access to these <br />ponds is anticipated to necessitate tree removal and restoration of temporary access impacts, <br />including private landscaping facilities in some areas. <br />See Figure 1 in Appendix A for the proposed project layout identifying the limits of each <br />proposed pond dredging operation. Sediment sampling and an associated report of its findings <br />were completed by Braun Intertec for the ponds and the report is included in Appendix E <br />Trails <br />The public and City staff identified additional trail and retaining wall scope through the <br />feasibility study process that should be considered for addition to delivery of this project. <br />Upon review of the existing poor trail conditions, their location, and type of work necessary <br />to make improvements, it is recommended the improvements of trails adjacent be added to <br />the originally proposed and related street improvement scope of the project. <br />The proposed trail improvements include removal of the existing bituminous pavement and <br />repaving the trails with new bituminous on the existing aggregate base materials. <br />Additionally, the trails will have new concrete pedestrian ramps installed where the trails <br />proposed for rehabilitation intersect roadways in the project area. Beyond the pedestrian <br />ramps, the trails are proposed to be replaced, in kind, matching the existing trail alignments, <br />widths, and elevations. Due to the existing site topography, some segments of these existing <br />trails appear to be quite steep and may not be feasible to improve to strict compliance with <br />Americans with Disabilities Act (ADA) requirements beyond the new concrete pedestrian <br />ramps, consistent with the existing trail system along these recreational trails. <br />The trail between Norma Avenue and Indian Oaks Court is very narrow, particularly along <br />the west side of the trail. This trail is proposed to be widened to a standardized 6-ft width <br />throughout, matching the southern edge, and will maintain the existing drainage swale over <br />the trail along the backyard lot lines. The bituminous curb along the west side of the trail, <br />adjacent to 1503 Briarknoll Drive, is proposed to be replaced to continue to manage drainage. <br />Existing handrails along portions of the trails are proposed to remain in place. The modular <br />block retaining wall along the south side of the trail, approximately behind 1479 Colleen <br />Avenue, is also proposed to be replaced and improved as part of the project. <br />See Figure 1 in Appendix A for the proposed project layout identifying the trails to be <br />rehabilitated and the locations of ADA pedestrian ramp improvements. See Figure 3 in <br />Appendix A for the proposed retaining wall and bituminous curb replacements.
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