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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 6 <br />1-inch diameter copper pipe to individual residences. Curb stops and boxes will be installed <br />at the ROW where the new service pipe connects to the existing service pipe. <br />Beyond James Avenue, watermain improvements will include replacement of select leaky <br />gate valves and boxes and adjusting the remaining gate valve boxes within the project <br />pavement areas to final grade to provide a smooth/drivable street surface in conjunction with <br />the street resurfacing portion of the project. Some damaged valve box tops may require <br />replacement. <br />See Figures 2 and 3 in Appendix A for the proposed utility improvements. <br />Storm Sewer <br />Based on the existing storm sewer age, size, and performance, the existing storm sewer was <br />found to be in generally good condition. Storm sewer improvements will include <br />rehabilitations at select locations including CIPP lining, minor pipe replacement, structure <br />replacements, rings and casting replacement, re-mudding of structures/inverts, drainageway <br />channel re-grading, rip rap replacement/installation, and storm sewer apron improvements. <br />Some of the work identified will be taking place outside of the roadway area in easements <br />that include behind houses. Access to these areas may be difficult and will necessitate tree <br />removal and restoration of temporary access impacts, including private landscaping facilities <br />in some areas. <br />Stormwater quality improvements will also be implemented to help remove sediments and <br />pollutant loads to the downstream system. This will include the replacement of the last storm <br />sewer structure in the street prior to its outfall into a stormwater pond or drainageway. This <br />structure will be replaced with a new structure that includes a sump and SAFL Baffle to <br />capture sediment from continuing downstream. This will allow city maintenance staff to <br />easily access the structure and vac out accumulated sediment. Work on the storm sewer catch <br />basin structures within the existing concrete curb and gutter will additionally require the spot <br />replacement of the adjacent concrete curb and gutter surrounding the catch basin castings. <br />Proposed storm sewer improvements on James Avenue include the full replacement of the <br />storm sewer to accommodate the watermain replacement. Additional storm sewer <br />improvements are proposed along the trail adjacent to 4242 Norma Avenue based on a <br />preliminary design provided by city staff. This work is intended to capture sediment <br />south/southeast of the property and route it to the storm sewer system as opposed to following <br />the current overland drainage path that generates stormwater issues at the property. This work <br />will require the removal of several trees in the area to construct the improvements. <br />Beyond the work identified above, the remaining storm sewer manhole castings within the <br />pavement of the project areas will be adjusted to final grade to provide a smooth/drivable <br />street surface in conjunction with the street resurfacing portion of the project. Some damaged <br />castings may require replacement. This work will include the replacement of all concrete <br />adjustment rings for each applicable manhole structure within the pavement limits. <br />See Figures 2 and 3 in Appendix A for the proposed utility improvements. <br />Stormwater Ponds <br />The two stormwater ponds identified by city staff to have collected significant sediment <br />accumulation over time which has reduced their working capacities are proposed to be <br />dredged as part of the project. The proposed pond dredging will reestablish the originally <br />designed pond volume. The first pond is located between McClung Drive and Briarknoll <br />Circle, just north of the bituminous trail. The second pond is located south of Colleen <br />Avenue, just west of Hamline Avenue North, however, only a portion of this pond is within
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