Agenda - Planning Commission - 05/03/2007

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Preliminary Plat and Preliminary Site Plan Review: Symphony At TO\\7J1 Center April 26, 2007 Page 4 of7 plan complies with the development guidelines and provides green spaces for recreational and stormwater management purposes on each block. 8. Grading and Drainage: Staff has received a grading and drainage plan for the revised development plan and has the following comments. Stormwater calculations must be submitted to the City and Lower Rum River Water Management Organization for verification of conformance with the master drainage plan. The rock constm.ction entrance on the Stormwater Pollution Prevention Program (SWPPP) must be supplemented with the City requirement "Adjacent streets must be swept daily and as directed by the City during active construction. The responsibility for the SWPPP on this site must be transferred to the new owner and contractor prior to commencing construction. Provide a copy of the transfer. notice to the City. A SWPPP is required for tlns project. It must reference the SWPPP prepared for the Ramsey Tovvn Center Project and provide for transfer of responsibility from RTC, LLC to this developer and contractor. The master stormwater plan provides rate control for the entire Ramsey Town Center Project. The plan requires application of Best Management Practices (BMPs) on each site to enhance stormwater quality. The infiltration basins shown on the plans will provide water quality treatment, however it appears only 30% of the site drains to these devices, the remainder of the water discharges directly to the regional system. The percentage of the site draining to a BMP must be increased by rerouting water to the infiltration basins or by installing water quality treatment devices at each point where stormwater leaves the site. The maximum cross slope on driveways must be adjusted from 3% to 2.5%. Sapphire Way must be revised to have a crown from 146th Avenue to 145th Place as well as all of 146th Lane. Universal cross slope will be permitted on private drives between buildings, not on the collector drives accessing the public streets. Silt fence must be shown on the enlarged grading plans. Curb cuts draining to the Bioretention Facility must be replaced with a structure and outlet pipe. The local soils are erode easily and curb cuts like these require constant maintenance. 9. Utilities: This subdivision will be served by sanitary sewer and city water services that will be extended into the development. The following specific comments must be addressed: Ductile iron pipe 6" and smaller must be Class 53, 8" and larger is Class 52. Provide specifications for the Ecostorm 1.5 device. Provide Ecostorm devices at STMH 101 and CB:MH 117. The applicable city details must be added to the sheets. Contact the Engineering department for the latest details. 10. Tree Preservation. A tree preservation plan is not required as the site is void of trees. 22