#13 - Limerick Village Concept Plan

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PAGE 3 of 4 Manning Avenue (CSAH 15). Sidewalks must be shown on both sides of residential roadways in median and high‐density residential areas. RESIDENTIAL STREETS 1. All streets along single‐family units must be public streets and must meet the City’s Engineering Design Standards including right‐of‐way width (66‐feet) and pavement width (32‐feet). Additional right‐of‐way may be needed at intersections with Hudson Boulevard and 5th Street North to accommodate turn lanes. 2. All street intersections must be at 90 degrees and maintain 50‐ft of tangent with maximum longitudinal slopes of 2.5%. Revisions to the street geometrics appear to be required. 3. Surmountable concrete curb and gutter shall be installed in single family residential areas with future driveways and B618 curb installed along entrance roadways and roadway stretches with no lots. 4. Limerick Parkway. The design of Limerick Parkway should be constructed to a width of 32 ft. (FOC‐FOC) with an 8‐ft. trail along one side and a 6‐ft. sidewalk on the other (similar to Village Parkway in the Easton Village and Northport subdivisions). 5. All public streets must be reconfigured to maintain the physical street centerline at the centerline of the right‐of‐way. 6. A 10‐foot utility corridor easement must be provided for small utilities along both sides of all public right‐ of‐way. The 10‐ft D+U corridors must be reserved for the installation of small/dry utilities and must remain free from all encroachments, including retaining walls, trees, fences, signs/monuments, and must maintain standard 4% boulevard grading. 7. It appears that the Apartment Units and 20‐unit Townhomes are proposed to be fronted by private streets. Prior to receipt of a preliminary plat application, the private street design details should be presented and accepted by city staff, including off‐street parking requirements, minimum allowable street widths, hydrant locations, and snow storage locations. 8. The private street design details must also show the proposed layout for sanitary sewer, public watermain, and small/dry utilities. Watermain easement locations must be shown at 30‐ft. wide centered over the pipe and dedicated corridors for small/dry utilities must be shown with no encroachments to the easements with the exception of 90‐degree crossings. STORMWATER MANAGEMENT 1. The site plan is subject to a storm water management plan 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. 2. The sketch plan proposes to provide a local/regional stormwater management pond/infiltration basin of just under 9 acres near the center of the site. The application narrative also makes reference to the use of an infiltration bench. As the site design evolves it will be important to create a design with separate “wet pond(s)” and “infiltration basin(s)” as the city no longer allows infiltration benches as an approved BMP design. 3. Soil borings must be obtained for all proposed infiltration basins in the number and depth as outlined in the City Engineering Design Standards and submitted as part of any preliminary plat application for the application to be deemed complete. Design infiltration rates must be based on the recommendations informed from only the borings taken within the basin footprint. 4. Rate and volume control requirements must be met for all points of discharge from the site. 5. All storm water BMPs must be placed in Outlots. The stormwater facility Outlots must fully incorporate the 100‐year HWL, 10‐foot maintenance benches and all BMP maintenance access roads. Maintenance access roads meeting city standards must be provided for all storm water facilities. 6. Overland emergency overflow elevations and pathways are required and must be utilized for all stormwater ponding while maintaining 1‐foot minimum separation between structure low opening elevation and the overland EOF. 7. The storm sewer system shall be designed to maintain the city standard minimum pipe cover of 3.0 feet. Drain tile is required as part of the city standard street section at all localized low points in the street. Drain tile considerations may impact the storm sewer design and depth requirements at low points.