A. Grading:
1. No grading, filling, or excavation of any kind shall be accomplished adjacent to any canal or river without first obtaining approval from the city engineer.
2. Any land or parcel, or portion of any parcel having a slope of greater than ten percent (10%) shall not be graded to a slope that exceeds forty percent (40%). Development or grading in areas having slopes below forty percent (40%) shall be approved through a conditional use permit.
3. All preliminary street and site grading shall be completed prior to the installation of utilities.
4. Fills in areas intended as structural foundations, including roadways, shall be compacted to at least ninety five percent (95%) by ASTM D-1557. All other fills shall be compacted to at least ninety percent (90%) by ASTM D-1557. Test reports verifying compliance with this provision shall be submitted to the city engineer by the developer, at the developer's expense.
5. Borrowing for fill shall be prohibited unless the material is obtained from a cut permitted under an approved grading plan.
6. Cut slopes shall be constructed to eliminate sharp angles of intersection with the existing terrain and shall be rounded and contoured as necessary to blend with existing topography to the maximum extent possible. The city will not accept the dedication and maintenance of cut and fill slopes except those within the required street right of way. Where a cut or fill slope occurs between two (2) lots, the slope shall normally be made a part of the downhill lot.
7. Grading, cuts and fill to obtain access to developable property above a ten percent (10%) slope shall be approved through a conditional use permit by Plain City planning commission.
8. Sections of the international building code regulating excavation and grading shall be complied with, except that decisions described therein to be made by the "building official" may also be made by the city engineer.
B. Site Elements: Site elements shall include:
1. Retaining walls that blend with natural topography.
2. Planting near retaining walls.
3. Minimum lighting needed for pedestrian safety.
4. Large areas of formal landscaping are prohibited.
5. Grading should be minimized in areas where the slope is greater than thirty percent (30%).
6. Drainage channels should receive a naturalizing treatment including native rock and landscaping.
7. Use of natural building materials to blend in with the surroundings.
8. Smaller roof components so structure appears less intrusive.
9. The maximum height of buildings shall not exceed the height allowed in the zoning/overlay district.
10. Canals, rivers and streams are required to be fenced or piped as determined by planning commission and or city council for public health, safety or welfare.
C. Drainage:
1. Required stormwater runoff collection facilities shall be designed so as to retain stormwater runoff on development sites for a sufficient length of time so as to prevent flooding and erosion during stormwater runoff flow periods.
2. Required stormwater runoff collection facilities shall be so designed as to divert surface water away from cut faces or sloping surfaces of a fill. Subsurface drains are not acceptable.
3. Curb, gutter, and pavement designs shall be such that water on roadways is prevented from flowing off the roadways.
4. Natural drainages shall be riprapped or otherwise stabilized to the satisfaction of the city engineer below drainage and culvert discharge points for a distance sufficient to convey the discharge without channel erosion.
5. Waste material from construction, including, soil and other solid materials, shall not be deposited within a natural or manmade drainage course or within irrigation channels.
6. Sediment retention facilities shall be constructed as part of each development as directed by the city engineer.
D. Vegetation And Revegetation:
1. Every effort shall be made to conserve topsoil which is removed during construction for later use on areas requiring vegetation or landscaping, e.g., cut and fill slopes.
2. New planting shall be protected.
3. All disturbed soil surfaces shall be stabilized before final acceptance of the development by the city.
4. The developer shall be fully responsible for any destruction of native vegetation which is required to be retained in all areas under the ownership and control of the developer. The developer shall carry the responsibility for such areas both for the developer's own employees and for all subcontractors from the first day of construction until final acceptance of the development by the city. The developer shall be responsible for replacing such destroyed vegetation.
5. Prior to the termination of the bonding period, any dead plant materials required to be installed by the developer shall be replaced and a new bond issued to assure establishment of the replaced materials.
E. Fire Protection:
1. Lot size and potential placement of buildings thereon shall be such that adequate clearance of hazardous, flammable vegetative cover may be accomplished.
2. All easements for firebreaks for safety of built up areas shall encompass access for firefighting personnel and equipment and such easements shall be dedicated for this specific purpose by being recorded.
3. The inability to provide fire line water pressure consistent with the standards set by the Utah state division of drinking water, the international fire code and the Plain City fire marshal shall be justification for denial of a development request.
F. Streets:
1. All streets within a hillside area shall be designed to meet the standards required for streets in all other areas of the city except that sidewalks of not less than six feet (6') in width may be required on one side of streets within a hillside area. (Ord. 2013-04, 4-18-2013, eff. 4-19-2013; amd. Ord. 2023-07, 6-1-2023)