Agenda - Council - 08/12/2003 - Laserfiche WebLink

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-240- of a lot east of Helium Street. A portion of the undeveloped land north of the subdivision contributes runoff, to this detention basin. Without the relocation and improvement of this detention basin by providing an outlet, and the provision of an underground storm drainage system, the subdivision will experience increased flooding. The Lower Rum River Watershed Management Organization will require storm water runoff from the subdivision and other contributing areas to be pre-treated prior to discharging to the neighboring wetland, which eventually discharges to the Rum River. B. Water .S. vstem The subdivision has individual wells for each developed lot. There are stub outs for connection to the City's 12" trunk water main in CSAH 5 and to the existing water system in eastern end of 150~h Lane. C. Sanitary Sewer System The subdivision has individual septic tanks for each developed lot. There is a stub out for connection to the City's 8"sanitary sewer at the eastern end of 150Ih Lane. 4.0 PROPOSED IMPROVEMENTS A. Streets and Storm Drainaqe The City's existing aerial'topography was used to develop existing and proposed profiles of the streets and identify the current drainage patterns. Existing conditions, including location of existing storm drainage culverts, were verified in the field. The relative location, elevation and gradient, of existing drivew~ay connections were noted in the field. The proposed street pavement is a seven (7) ton class with mountable concrete curb and gutter, thirty-two (32') feet width to back of curbs. The underground storm drainage system will be designed to carry the 1 O-year storm flowing full. See "EXHIBIT A" for detailed description of the proposed street and storm drainage improvements. B. Water System The proposed water system improvements will provide a minimum 8" water main with the connection of larger trunk lines in accordance with the City's master plan. All mains will be DIP. Fire hydrant spacing will be approximately 300 to 400 feet. One-inch service connections will be provided for all existing developed lots. Where the adjoining property is undeveloped, one-inch services will be provided at 85 foot intervals. Page 3 G:\MunicipalXARAMSEY\a32\RA632FSR1 .doc I I' I I I I I I I I I I, I I ! i I I !