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! <br /> <br />4.0 <br /> <br />sides of the street, the street may need to be super elevated to help match the <br />existing driveways. <br /> <br />There are several locations within the existing road where storm .runoff ponds <br />until it infiltrates into the ground. There are not any roadside ditches or <br />underground storm drainage system to collect the storm water. Without the <br />provision of a detention basin and the provision of an improved street drainage <br />system, the subdivision will experience increased flooding. <br /> <br />In addition, drainage from the Brandseth Subdivision to the north, sheet drains <br />across the second lot on this north side of 152nd Ave. and just west of Fluorine <br />Street. <br /> <br />B. Water System <br /> <br />The subdivision has individual wells for each developed lot. There are two stub <br />outs for connection to the City's 8" water main in the service road west of TH47. <br /> <br />C. Sanitary Sewer System <br /> <br />The subdivision has individual septic tanks for each developed lot. There are two <br />stub outs for connection to the City's 8' san'tary sewer in the service road. west of <br />TH47. <br /> <br />PROPOSED IMPROVEMENTS <br />A. Streets and Storm Drainaqe <br /> <br />The City's existing aerial topography Was used to develop existing and proposed <br />profiles of the streets and identify the current drainage patterns. Existing <br />conditions, including location of existing storm drainage culverts, were verified in <br />the field. The relative location, elevation and gradient of existing driveway <br />connections were noted in the field. <br /> <br />Under Option 1, the proposed street pavement is a seven (7) ton class with <br />mountable concrete curb and gutter, thirty two (32') feet width to back of curbs. <br />The underground storm drainage system will be designed to ca[fy the 10-year <br />storm flowing full. <br /> <br />Under Option 2, the proposed street would be 4" of Class 5 crushed base, 24' <br />wide, 4' wide shoulders and 4:1 ditch slopes to an 18" deep ditch on both sides. <br />Driveway culverts would be needed at each driveway. The underground storm <br />drainage system that will collect drainage from roadside ditches and carry the <br />runoff to the detention pond will be designed to carry the 10-year storm flowing <br /> <br />Page 4 <br />G:\MunicipaI~ARAMSEY\633\RA633FSR.doc <br /> <br />-387~-~ <br /> <br /> <br />