1. Lot Size And Arrangement.

a. Any portion of a proposed subdivision containing hillsides or steep slopes shall be platted on the basis of lot sizes in the accompanying chart.
b. Percent of natural ground slope — graph.

 

2. The Commission may permit a deviation in the front yard setback areas in order to permit garages and driveways to be placed at street level. Where excess lot slopes are to be used as building sites, the subdivider shall show on the plat the location of all buildings or structures proposed. No structure or building shall be permitted to project into a street right-of-way.

B. Streets.

1. Lesser widths of rights-of-way, pavements, and accessory elements as required in Section 410.040: Minimum Standards Of Design may be approved by the Commission upon its determination that the cross slope will not permit compliance with provisions therein.
2. In subdivisions or portions thereof having lots of a minimum area of one (1) acre, the following standards should apply:

a. Street grades for minor residential streets may be increased to twenty-five percent (25%), provided that straight curbs are installed.
b. Rights-of-way widths may be reduced to thirty (30) feet, with a minimum pavement width of eighteen (18) feet, if straight curbs are installed on at least one (1) side of the street.
c. Integral curbs may be permitted.
d. Pavements and curbs shall be constructed in accordance with the requirements in force.

3. Design standards and improvement requirements for horizontal and vertical street curves may be reduced to a seventy-five-foot radius for minor streets. Standards for street grades shall be the same as § 410.040(A)(1)(f), except that some grades on minor streets may be permitted up to twenty percent (20%) for short straight distances. All streets which have grades of fifteen percent (15%) or more shall have straight curbs installed.
 

C. Grading Plan. Contour lines of five-foot intervals shall be shown on the plat where the average slopes exceed six percent (6%). Where slopes in excess of fifteen percent (15%) occur, the preliminary plat shall indicate the general location and magnitude of all cuts and fills. A grading plan shall be submitted with the preliminary plat showing how the proposed grading will affect the drainage of the surrounding area and the nature of the improvements which are proposed, if the average slope of the hillside subdivision is in excess of twenty-five percent (25%).

D. Cut And Fill Areas.

1. Cuts, excavation, grading and filling, where same materially changes the site and its relationship to the surrounding property, shall not be permitted if such excavation, grading, or filling results in slopes in excess of twenty-five percent (25%) except where adequate engineering facilities are constructed to prevent slides and erosion.
2. Where a cut or fill area is outside the normal right-of-way of the street, an easement shall be provided of sufficient width and area to permit the required side slopes, drainage channels, warping and rounding of cross section to be constructed and maintained.
3. Structures or buildings, when located near cuts or fills, shall have a setback line of not less than ten (10) feet from the crest of fills up to twenty-five (25) feet in height and the distance will be increased proportionally for higher fills. On cuts, a building or structure shall have a setback line of not less than twenty (20) feet distant from the base of the slope.
4. In any fill area, satisfactory compaction of fill is mandatory. Compaction of a lesser density, as determined by the Commission, may be permitted in those areas where no building or structure is to be placed.
 

E. Stormwater Drainage System. The improvement plans for an adequate stormwater drainage system, including all necessary open ditches, pipes, culverts, intersectional drains, drop inlets, bridges, and other necessary structures, and improvements which are required for the proper drainage of all surface waters shall be provided. This system must prevent the infiltration of water in areas of fills or cuts thereby causing the land to slip or collapse. Adequate provision and maintenance must be made for on-lot drainage channels and control of erosion on slope areas for either cuts or fills.

F. Water Supply System. Where applicable, the improvement plans for the water supply system installation shall be approved by local officials and the governing body prior to the submission of the final plat.

G. Sewage Disposal System. The improvement plans for the sewage disposal system installation shall be approved by local officials and the governing body prior to the submission of the final plat.

H. Utility Easements. Utility easements will be as required by Section 410.040: Minimum Standards Of Design.

I. Utility Connections. Connection between stormwater drainage systems and sewage disposal systems shall not be permitted.