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(3) <br />b. Watercourses, lakes wetlands, limits of floodplains and other significant physical features <br />shall be delineated. The ordinary high-water elevation and 100 -year floodplain elevation shall <br />be identified. <br />c. If the subdivision is to be serviced with on-site systems, the soil types shall be identified. For <br />each lot having less than 25 percent Class I soils, the location of a septic field and alternative <br />field must be identified. <br />d. Locations and invert elevations of storm sewers and drainage ditches and culverts within the <br />plat and to a distance of 100 feet beyond the plat. <br />e. Proposed method of conveying surface water drainage within and beyond the limits of the <br />plat to publicly owned or controlled drainage facilities or storm sewers. <br />f. Proposed method of disposing of surface water drainage and method of conveying surface <br />water drainage within and beyond the limits of the plat to publicly owned or controlled <br />drainage facilities or storm sewers. There shall be no grades less than one percent. When <br />grades are less than two percent, a certificate of grading will be required prior to the <br />occupancy. The certificate of grading shall provide a statement from a registered land <br />surveyor stating that such surveyor has surveyed the lot and determined that it contains no <br />grade flatter than one percent and conforms to the approved grading plan. <br />g. For subdivisions within the MUSA boundary, lot corner elevations as well as drainage swale <br />centerline grades at intersections of lot lines. <br />h. Drainage and utility easements. <br />i. Direction of flow arrows in and around house pads. <br />j. Revised in accordance with sketch plan comments and staff review letter. <br />k. Additional information as requested by the city. <br />Final landscape plan/tree preservation plan: <br />a. Survey of existing tree cover prepared by an International Society of Arboriculture (ISA) <br />certified arborist that shall include the following information: <br />1. Location of proposed lots and building pads. <br />2. Tree species, diameter (dbh), condition (healthy, dead or diseased). Any development <br />involving oak trees on or adjacent to the development area must submit a plan in <br />conjunction with the preliminary plat. <br />3. Soil conditions. <br />4. Existing contour data for the entire property with vertical contour data consistent with <br />city standards for all areas to be disturbed by proposed tree removal operations, <br />extending for a distance of at least 50 feet beyond the limits of the proposed plat. <br />Elevations may be based on U.S. Geological Survey data. <br />b. Proposed tree removal limits. Any clearing of oak stands shall be performed prior to April 15 <br />or after July 15 of each season. <br />c. Proposed number, species, and size of trees and shrubs to be planted. <br />d. All irrigation systems must have an approved backflow device installed in the irrigation <br />enclosure. Irrigation enclosure location and construction materials are subject to the <br />approval of the city engineer. Further, all new or updated systems must install a rain sensor <br />device to stop irrigation during rain events. <br />e. Additional information as requested by the city. <br />(e) Recording. <br />