#12 - Lake Elmo Elementary Final Plat

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Page: 2 but are not limited to trees, structures, landscaping, fences, retaining walls, storm sewer running parallel with the easement, stormwater basins and BMPs, and grading that exceeds 4:1. 4. Dedicated drainage and utility easements, minimum 10-feet wide, are required along all public roadway frontage. Easements along public roadways, including Lake Elmo Avenue (CSAH 17) and 10th Street (CSAH 10), have been shown on the Final Plat as required. 5. Dedicated utility easements are required over all public watermain as determined by the City Engineer and Public Works Director. Easements must be a minimum width of 30-feet centered over all public watermain and each hydrant. Dedicated utility easements have been shown on the Final Plat. Revisions may be necessary as the Construction Plans are reviewed and finalized. 6. Drainage and utility easements are required over all stormwater BMPs, including the 100-year high water level areas, maintenance access roadways to a public right-of-way, maintenance benches, and over all emergency overflow locations and pathways. Stormwater management easements are shown on the Final Plat. Easement revisions may be necessary as the Construction Plans are reviewed and finalized. 7. The storm water management facilities will remain privately owned and maintained. A Storm Water Maintenance and Easement Agreement in the City’s standard form of agreement must be executed and recorded with the Final Plat for all privately owned stormwater facilities. 8. All off-site permanent and temporary easements, if necessary to construct the proposed site improvements, must be acquired and provided to the City prior to the approval of the Final Construction Plans. Each easement, if needed, must be provided in the City’s standard form of easement agreement. STORMWATER MANAGEMENT 1. The site plan is subject to a storm water management plan (SWMP) meeting State, Valley Branch Watershed District (VBWD) and City rules. Storm water facilities proposed as part of the site plan to meet State and VBWD permitting requirements must be constructed in accordance to City Engineering Design Standards dated January 2022, even though they will remain privately owned. 2. The stormwater management mitigation must be provided for all required site improvements, including the County roadway and intersection improvements, County roadway turn lanes, and all bituminous trails. 3. In addition, it should be condition of the Final Plat that the stormwater management BMPs be oversized to accommodate the future County roadway improvements to be constructed by the County at a future date. The stormwater BMP oversizing must address the additional proposed impervious surface areas as provided by Washington County. 4. All stormwater facilities and BMPs will be privately owned and maintained by the school district. The school district will be required to provide a Stormwater Maintenance and Easement Agreement in accordance with the City’s standard form of agreement. 5. All storm water basins must be placed in easements in accordance with the Stormwater Maintenance and Easement Agreement. The easements must fully incorporate the 100-year high water level areas, 10-foot maintenance bench, maintenance access roadways to a public right-of- way, and over all emergency overflow locations and pathways. 6. Overland emergency overflows or outlets will be required as part of the site and grading plans. 7. All infiltration basins shall be sized using design infiltration rates based on actual soil borings obtained from within the basin footprint at the proposed basin bottom elevation. Soil borings must be taken for each infiltration basin in the number and to the depths required by the VBWD and City design standards. Soil boring information submitted to date remains insufficient. 8. All wetlands and wetland buffers must be delineated and protected by easement.