1. Improvement plans required. The owner or subdivider shall, at the time of his or her submission of the preliminary plat to the Planning Commission, also include at least four copies of the improvement plans required by these subdivision regulations. Improvement plans shall include, but not be limited to, plans for the following:
a. Streets;
b. Sanitary sewer;
c. Water;
d. Drainage; and
e. Erosion and sediment control.
2. Specifications. Plans shall be drawn at a scale of not more than 50 feet to one inch, on 24-inch by 36-inch sheets, and shall include, but not be limited to, the following:
a. Plans and profiles showing the locations and typical cross-section of proposed street improvements, including curbs, gutters and sidewalks;
b. The location, size, profile and invert elevations of proposed sanitary sewers, including manholes;
c. The location and size of proposed water mains, valves, fittings and fire hydrants, including service taps underneath proposed streets;
d. The location and design of drainage structures, easements or rights-of-way dedicated to the public, including typical cross-sections of all channel improvements and a site grading plan; improvement plans shall be accompanied by drainage calculations in accordance with the adopted standards and regulations for drainage improvements; and
e. The location of all existing or proposed easements and rights-of-way and a typical cross-section of the proposed utility installations within said easements.
3. Preparation of plans. Improvement plans shall, as required by law, bear the seal of an engineer registered in the state.
4. Erosion and sediment control plans. Erosion and sediment control plans shall be submitted for the Planning Commission’s and City Council’s review, showing compliance with the following provisions, before a final plat may be approved.
a. Stands of existing trees, as they are to be preserved upon project completion, and specifying their locations on the property, shall be shown.
b. The projected sequence of work shall be shown.
c. Development shall be accomplished so as to minimize adverse effects upon the natural or existing topography and soil conditions and to minimize the potential for erosion. No site shall be graded except in accordance with approved plans to meet foundation, parking and the drainage requirements of these regulations.
d. Plans for development shall minimize cut and fill operations.
e. During construction, adequate protective measures shall be provided to minimize damage from surface water to the cut face of excavations or the sloping surfaces of fills.
f. Fills shall not encroach upon natural watercourses, their floodplains or constructed channels in a manner so as to adversely affect other properties.
g. Alteration of land in existing developed areas shall be conducted in such a manner that changes in patterns of natural drainage shall not adversely affect other landowners.
h. No construction materials or construction by-products shall be discarded in any drainageway or stream.
i. Land shall be developed in increments of workable size which can be completed during a single construction season. Erosion and sediment control measures shall be coordinated with the sequence of grading, development and construction operations. Control measures such as hydro-seeding, berms, interceptor ditches, terraces and sediment traps shall be put into effect prior to the commencement of each increment of the development and construction process.
j. Existing trees shall not be cut or otherwise damaged or destroyed within portions of property to be used for required open space, setback or buffer requirements of the zoning ordinance of the city.
k. In cases where retention of natural trees would create unusual hardship or development problems in open space, setback and buffer areas, planted trees may be required in lieu of preserving existing trees.
l. No concrete, asphalt or other impervious material paving within the tree crown zone of trees to be preserved shall be allowed.
m. Soil and other materials shall not be temporarily or permanently stored in locations which would cause suffocation of root systems of trees to be preserved.