Agenda - Council - 02/23/2016 - Laserfiche WebLink

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CITY OF RAMSEY LAND USE APPLICATION TECHNICAL REVIEW FILE DATE FEBRUARY 12, 2016 PROJECT ADDRESS ALPINE DRIVE EAST OF ANDRIE STREET PROJECT. TITLE NORTHFORK ALPINE ADDITION ESCROW # DEPARTMENT: Engineering TECHNICAL REVIEWER: Name: Leonard Linton Phone: 763 433-9834 Email: llinton@ci.ramsey.mn.us We offer the following comments regarding your request for the Preliminary Plat of Northfork Alpine Addition. The submittal consists of 5 sheets prepared by Roshell Engineering, LLC dated January 7, 2016. The sheets are Preliminary Plat, Grading and Drainage Plan, Grading, Drainage and SWPP Plan and Stormwater Pollution Prevention Plan sheets 1 and 2. General: The submitted minor subdivision proposes to divide an existing outlot into 4 residential lots. The property is located north of Alpine Drive and east of Andrie St. Streets and Access: The development accesses Alpine Drive, and proposes constructing a cul-de- sac to provide street frontage for the lots. The street will be an urban section with concrete curb and gutter. Catch basins will be installed at the intersection of the new street with Alpine Drive to catch runoff from the development. Preliminary Plat Sheet: The engineer information must be updated to match the title block. Drainage and Utility easements are required over the infiltration basin, retention pond, storm sewer system and pond overflow. These improvements serve multiple properties and will be maintained by the City. The City needs easements in order to access the facilities for maintenance. The easements must encumber the 100 year high water elevation and must be wide enough for vehicle access from the street to the basins. Grading and Drainage Plans: Staff offers the following comments on the Grading plan: 1. Lot corner elevations need to be provided on all lot corners. The 100 year high water elevations for ponding areas is shown. The maximum high water elevation must be shown for the infiltration area (see note 14). All lowest floor building elevations must be two feet above the highest elevation noted. 2. A tabulation of lot elevations with minimum floor elevations and adjacent pond high water levels must be added to the plan. 3. The emergency overflow elevation for the water quality pond must be one foot lower than the lowest adjacent grade of the building structures.