10-26-2022 Council Packet - Laserfiche WebLink

Home Browse Search

Name: Corrin Wendell Date: October 7, 2022 Page: 4 H:\Heidi\Planning\Planning Cases\1415 - Lennar - Final Plat 1st addition Variance Rezoning - Paul Tabone\City Engineer Comments Review Memo 10.6.docx Pond Details • Remove sluice gate from OCS.. not practical given the height of the weir wall at the orifice elevation. Water can be pumped over the weir wall to drain the system during times of maintenance. • The OCS detail should be drawn closer to a real scale. The outlet pipe and draintile pipe are shown at the same grade or higher than the inlet pipe but are actually 4’ lower. This makes it difficult to visualize how the OCS operates. The sump on the upstream side of the weir should be filled with concrete and the structure can be made so that there is no sump on the downstream side. • Change the treated timber to vinyl sheet pile for the transition from wet pond to filtration basin. • There doesn’t appear to be a planting plan for the filtration basin. If this is indeed the case, the filtration media should be modified to remove the 30% compost and only include 100% clean sand. If plantings in the filtration media are proposed, keep the compost and include a low maintenance planting plan in the plans. • Construction notes should be added to the detail to ensure impermeable / clay soils are used to separate the wet pond from the filtration basin. Permeable soils will lead to inadvertent pond draining. Street and Storm Plan/Profile • Provide a ‘bump-in’ at the south end of Vanderbie as it approaches the Allen Avenue intersection. This roadway construction would be 22’ face to face with an approximately tangent of 100’. The taper to the bump in should occur after the two existing residential driveways on the east side. Additionally, provide a ‘bump-in’ to 22’ at the trail crossing. • A permit will be required from Ramsey County for Vanderbie street and utility construction adjacent to and connecting to County Road D. • Vanderbie: what is the plan with the existing catch basin at the intersection with County Road D? This will need to be modified/reconstructed to fit the new pavement. (CG-107) • Vanderbie: shift LP at Sta. 11+77 to get catch basins out of driveway entrances • Vanderbie: are structures 5221/5222 intended to be sump structures? They have approximately 18” of sump depth deeper than pipe inverts and are visually depicted as sump structures. Either remove the sumps if not being used for stormwater management or size the sump depth to match the structure diameter. This comment applies to many catch basins that have a sump elevation denoted in the storm structure table. • General note: increase storm sewer linetype – it so small it gets lost underneath the curb lines • Vanderbie: move catch basins 5223/5220 a few feet further north. As shown, will be too close to pedestrian ramp curb tapers. • The trail crossing at Vanderbie depicts asphalt between the sidewalk and street. This should be a concrete pedestrian ramp. • General note: any structures that need to be raised to the final lift of asphalt should be shown in plan view (sanitary castings, gate valve boxes, etc.)