Agenda - Planning Commission - 06/19/2012 - Special

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Preliminary Plat and Site Plan Review: COR THREE June 15, 2012 Page 5 of 9 Public Streets 10. : The development project will be served by existing public streets constructed as part ththth of the Ramsey Town Center 8, 9, and 10 Additions. The streets will need to be open cut to install This is different than the pavement section listed on the plans. Notification must be provided 48 hours prior to closing the streets for utility installation. Installation of the utility services for Lot 4, Block 2 will require a bypass lane for residents and emergency vehicles while the street is closed. The location of underground utilities, electric, gas, telephone and cable must be shown on the plans. The location of existing sewer and water services must be shown on the plans. Grading and Drainage: 11. Staff has received a grading and drainage plan for the development and has the following comments: Benchmarks are shown on the cover sheet. They are located south of Sunwood Drive. Benchmarks north of Bunker Lake Boulevard must be provided. Grading limits must be shown on the plans. The topsoil test plots and community garden locations must also be shown. The plans call for scraping the streets at the end of each day. This shall be replaced with sweeping the streets, scraping the soil off the street is not an acceptable Best Management Practice in the City. The walkout elevations and garage floor elevations should be adjusted so that the garage elevation is adjacent to the garage. The NPDES summary on the grading page does not reflect the proposed impervious cover on the site. We estimate the proposed impervious cover is close to 1 acre, not 0.07 acres. The normal and high water elevations of the pond must be shown on the plans. The lowest opening elevations for Lots 1 4, Block 2 must be re-evaluated as noted in the Stormwater Analysis section. Please provide the proposed function of the low area on the west part of Lot 1, Block 1. It appears to be a small ponding area; however, it is not protected with drainage and utility easements. Dewatering will most likely be needed to construct the pond since the bottom is below the wetlands on adjoining properties. Stormwater Analysis: 12. The following comments must be addressed: Stormwater rate control is provided by regional ponding in the COR. The stormwater management stormwater narrative submitted with the plans indicated a P8 model was prepared for the site and results from this model demonstrate the water quality goals are met. The P8 model results must be submitted to substantiate this statement. The dead storage volume of the pond must be included in the Hydrocad model.