Agenda - Planning Commission - 09/07/2006

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Site Plan Review: OM! Expansion August 31, 2006 Page 3 of4 service(s) that must be shown on the utility plan. Please submit details regarding the utilities for such a system. If a reduction in pl~tings is made, .or if alternate species are to be utilized, a revised plan will need to be submitted. Drainage and Grading: A grading, drainage, erosion control, and utility plan has been prepared for this expansion by Charles W Plowe PE and dated August 7, 2006. In general the plan provides drain.age from the expanded parking lot into a newly created detention pond which overflows into protected wetland 675 W which is located immediately northwest of the subject property. Staff offers the following comments on the plan: . It is unclear where the roof drainage from the building expansion will be directed. The existing building drains to the east side of the building and flow north onto the flat area now proposed for the building expansion. It appears that this runoff will either be trapped between the building and the property line or may be directed northward in which case it will drain onto the parking lot of the property to the north, Life Time Fitness. It may be necessary to extend storm sewer to accept the runoff from these building roofs. . It is recommended that a second catch basin be provided on the east side of the driveway to intercept runoff from the parking lot and to prevent it from flowing into the County highway ditch. . Grades and topography need to be provided for the parking lot expansion immediately south of the existing building. . A retaining wall is proposed between the two northernmost loading docks. A safety railing should be specified on the top of this wall. . The normal and 100 year water elevations should be added to the plan for both the detention pond and the wetland. The flared end section discharging into the detention pond should be set so that is no more than two feet of fall to the normal water elevation. . The outlet from the detention pond consists of a drainage swale which is constructed onto the neighboring property. All construction off the subject property must be contained within drainage and utility easements. A piped outlet might also be considered in lieu of the swale. . A permit for the Lower rum River Water Management Organization will be required for this expansion. Loading Docks: City Code requires one loading dock for the first 10,000 square feet of floor space and one loading dock for every additional 25,000 square feet of floor space. The proposed expansion shows 2 loading docks and 1 drive-in access. RED Number: This property is subject to a storm water utility charge. The increase in the amount of impervious area will increase this charge. The city will determine the amount of the increase upon review of the final site plan. It should be noted that the creation of a detention pond on the site allows the property owner to apply for a credit toward this charge. The property owner may wish to apply to the City for consideration of this credit. 58