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10. <br /> <br />11. <br /> <br />12. <br /> <br />1" <br /> <br /> 9.50.04 <br />Topographic data, including contours at vertical intervals of ......... <br />than two feet, ~xcept that where the horizontal contour interval is 100 <br />feet or more, a one foot vertical interval shall be shown. Water courses, <br />lakes wetlands, limits of flood pla/ns and other significant physical <br />features shall be delineated. The ordinary high water elevation and 100 <br />year Flood Plain elevation shall be identified. U.S.G.S datum survey <br />shall be used for topo~aphic mapping. <br /> <br />Soils data, including classification of all surface soils, in accordance <br />with the Soil Conservation Service Classification system and togs of <br />borings sufficient in number and depth to establish the elevation of the <br />water table and soil types throughout the plat. <br /> <br />If the subdivision is to be serviced with on site systems, the soil types <br />shall be identified. For each lot having less than 25% Class I soils, the <br />location of a septic field and alternative field must be identified. <br /> <br />Locations and invert elevations of storm sewers and drainage ditches <br />and culverts within the plat and to a distance of 100 feet beyond the plat. <br /> <br />Drainage area map of existing subdivisions showing the acreage of each <br />drainage area (existing and proposed) as well as providing the <br />predevelopment and post development runoff rate, in cfs, for the 10 year <br />and 100 year storm events. <br /> <br />Pre and post runoff calculations. <br /> <br />Size and type of each storm sewer facility proposed. <br /> <br />Proposed method of conveying surface water drainage within and <br />beyond the limits of the plat to publicly owned or controlled drainage <br />facilities or storm sewers. <br /> <br />Lots with grades flatter than 2% must provide a certificate of grading <br />prior to issuance of the certificate of occupancy. The lots subject to this <br />requirement should be noted. <br /> <br />Lot comer elevations as well as drainage swale centerline grades at <br />intersections of lot lines. <br /> <br />Drainage and utility easements <br /> <br />Direction of flow arrows in and around house pads. <br /> <br />Revised in accordance with preliminary plat comments and staff review <br />letter. <br /> <br /> 9.50 Subdivision Regulations <br />-302- <br /> <br />9-14 <br /> <br />August 2003 Draft <br /> <br /> <br />