Agenda - Council - 10/05/2010 - Special

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Preliminary Site Plan Review - Ramsey Medical Building September 9, 2010 Page 4 of 6 • Should City Council approve the use of seed rather than sod, details will be required outlining application rate(s) and installation method. • Staff supports the use of native grasses; however, it is unclear whether the intent is to mow this area or to let the grasses grow to their natural heights. If it is the later, signage or some other strategy may need to be implemented because, to the untrained eye, native grasses have an appearance of an unmaintained area, which may not be appropriate in The COR. • Please clarify in planting schedule whether it is red oak (Quercus rubra) or northern pin oak (Quercus ellipsoidalis) that is proposed. • Finally, if this project is attempting to eliminate any irrigation of landscaping, some thought should be given to installing curb cuts (or eliminating curbing altogether) around the parking lot islands. The planting area could then be slightly depressed and utilized to capture the storm water runoff, creating a benefit of infiltration while also irrigating those plantings at the same time. The Applicant is responsible for maintenance of all proposed landscaping above and beyond City requirements, including the right -of way. Tree Preservation: This site is devoid of any significant tree cover and therefore, no tree preservation plan is necessary. Engineering Review Reviewer: Tim Himmer, City Engineer th immert ci. rarnseV• mn. us 763 - 433 -9893 Grading and Drainage: The building floor elevation should be set to be above the adjacent grade of the public streets while meeting ADA accessibility guidelines: The grade from the building to the property lines and extending to the limits of the shared accesses must be set to match the plans for the future buildings and parking. The COR Development utilizes regional stormwater ponds for rate control and water quality treatment. Each individual site needs to provide additional water quality treatment through the use of rain gardens, water quality treatment structures, or other BMP's. The plan is proposing to install a conventional system sewer system (inlet structures and pipes) that lead to a single discharge point at the southeast corner of the site.. Drainage calculations for both pipe and Stormceptor sizing must be submitted for review. The proposed Stormceptor design (sizing, removal efficiencies, specifications, etc.) should also be forwarded for review. Additional BMP's should also be considered and investigated to provide for some rate control and lessen the need for downstream piping/structure sizing, and reduce the volume of water leaving the site. Is it proposed that each subsequent Outlot that develops be required to provide their own separate stormwater management plan, or is there a way to integrate stubs to the adjacent property? There are several locations where "gutter out" curb and gutter are proposed on the plans, but it appears as if drainage conflicts may result in a few locations; specifically around the median in the northeast corner of the parking lot, around the median in the southeast corner of the parking lot, and directly in front of the building. The proposed bituminous curb along the north parking lot line is strictly a temporary improvement until the Outlot to the north develops. Additional catch basins should also be considered in