Agenda - Planning Commission - 01/31/2013 - Special

Home

CITY OF RAMSEY LAND USE APPLICATION TECHNICAL REVIEW FILE DATE 01/25/13 PROJECT ADDRESS TBD - MULTIPLE PROJECT. TITLE THE SEASONS OF RAMSEY ESCROW # 113355 DEPARTMENT: Engineering TECHNICAL REVIEWER: Name: Shane Nelson / Leonard Linton Phone: 763 433-9825/ 433-9834 Email: haengineering@ci.ramsey.mn.us/ llinton@ci.ramsey.mn.us Plans Reviewed: Final Utility & Street Construction Plan prepared by Pioneer Engineering dated 1-18- 13 consisting of 5 pages and Preliminary Construction Plans prepared by D'Heilly Engineering, Inc. dated 12-29-12 consisting of 7 pages. We offer the following comments regarding the submitted plans: PRELIMINARY CONSTRUCTION PLANS — D'Heilly Engineering Removal Plan: This project proposes removing existing pavement between 147th Circle and 147th Lane NW. Removal of existing utilities is also proposed. A removal plan for this work must be prepared and submitted. Grading and Drainage: The grading plan generally conforms to City Standards. Areas that need revision are noted below: • The 4 plex immediately west of 147th Circle is less than 1 foot above the high point for the emergency overflow route from the oval driveway. The lowest building elevation must be at least 1 foot above the emergency overflow elevation. • Several of the buildings adjacent to the infiltration area are less than 1 foot above the adjacent high point between catch basins. Minimum separation of 1 foot must be provided as noted above. • The infiltration area currently is covered by a berm constructed as part of the previous development. Infiltration is generally not recommended where soils have been impacted by construction. Documentation must be provided indicating the soils under the infiltration practice can provide the required infiltration capacity for the project. • These plans show catch basins in 147th Lane NW while the Pioneer Engineering plans do not. • The plans call for 18" and 24" perforated pipe in the infiltration area. This must be coordinated with the stormwater model. The stormwater calculations for the project must be revised as follows: • Provide calculations for the 10 and 100 year events for the oval driveway area and the infiltration area. The maximum water depth at the high points between catch basins must be provided. This project has received a permit from the Lower Rum River Water Management Organization (LRRWMO). The permit has 6 conditions that must be followed during construction of this project: 1. Erosion control measures shall be installed prior to commencement of construction.