Agenda - Planning Commission - 08/05/2010

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Transformations House Site Plan Review June 29, 2010 Page 4 of 7 • Please add the required sidewalk along the east side of Xkimo Street NW adjacent to the project. This sidewalk should extend from the southerly lot line to the existing sidewalk along 142nd Avenue NW. • Stormwater treatment must be accounted for on site, but the volume can be accommodated in the regional basin to the northeast. The City is open to various Best Management Practices (BMP's) to accomplish your treatment requirement. The current plans show all the paved areas, and potentially the building roof, running to two catch basins located in the parking lot. Additional inlets may be necessary at the south end of the parking Iot to adequately handle the proposed drainage area. All runoff must be handled on site and not directly discharged to public right-of-way. Stormwater calculations must be submitted showing the required treatment and pipe/pond sizing are met. • Attempts should be made to direct all stormwater to a treatment basin prior to discharge to the City system. This could include grassy swales, rain gardens, etc., with an ultimate outflow via an overland discharge point to the regional pond to the northeast, or connected to the City system further downstream. - • All connections made to the City's storm sewer system must be completed with RCP; no HDPE pipe is allowed. All proposed connections must be inspected and restored to the satisfaction of the City Engineer, and a financial security will be required ensuring such. • A maintenance agreement will be required for any proposed stormwater treatment structure (sump manholes and treatment basin) ensuring that they will be properly maintained on a consistent basis. • The detail sheet should be revised to include a proposed pavement section. Additional details should include Wimco's (or approved equal) for inlet protection, as the hay bale detail shown on the grading plan is not allowed. The valley gutter detail must be updated to include the required saw cut and milling required for patching back in the public street. A. detail should be added for the proposed sump manholes. Water tight wrap must be added to the storm sewer manhole detail near the adjusting rings and casting. The catch basin castings detail is not consistent with the proposed B612 curb and gutter shown on the plans; these castings are typical with B618 curb and gutter. What casting is proposed for manhole 100? These revisions can be incorporated into the plan set at the time of building permit application. • Locations for the proposed outfall curb and gutter should be noted on the plan sheets. • The minimum lot grade for overland drainage is 2%. You are proposing areas. that are 1%, therefore a grading as -built will be required following establishment of final grade to make sure adequate drainage is accommodated. • A Lower Rum River Watershed Management Organization permit is required for all land disturbing activities greater than one acre in size. 37