[R.O. 1988 § 15-38; Ord. No. 3500, §2, 4-1-2002]
During the construction process, soil is highly vulnerable to erosion by wind and water. Eroded soil endangers water resources by reducing water quality and causing the siltation of aquatic habitat for fish and other desirable species. Eroded soil also necessitates repair of sewers and ditches and the dredging of lakes. In addition, clearing and grading during construction cause the loss of native vegetation necessary for terrestrial and aquatic habitat.
[R.O. 1988 § 15-39; Ord. No. 3500 § 2, 4-1-2002]
The purpose of this Article is to establish general requirements and principles for the design and construction of erosion and sediment control measures within the City of Rolla.
[R.O. 1988 § 15-40; Ord. No. 3500 § 2, 4-1-2002]
(a) 
The Erosion and Sediment Control Plan shall include the following:
(1) 
A natural resources map identifying soils, forest cover, and resources protected under other Chapters of this Code. This map should be at a scale no smaller than one (1) inch = one hundred (100) feet.
(2) 
A sequence of construction of the development site, including stripping and clearing; rough grading; construction of utilities, infrastructure, and buildings; and final grading and landscaping. Sequencing shall identify the expected date on which clearing will begin, the estimated duration of exposure of cleared areas, areas of clearing, installation of temporary erosion and sediment control measures, and establishment of permanent vegetation.
(3) 
All erosion and sediment control measures necessary to meet the objectives of this Chapter throughout all phases of construction and after completion of development of the site. Depending upon the complexity of the project, the drafting of intermediate plans may be required at the close of each season.
(4) 
Seeding mixtures and rates, types of sod, method of seedbed preparation, expected seeding dates, type and rate of lime and fertilizer application, and kind and quantity of mulching for both temporary and permanent vegetative control measures.
(5) 
During construction, provisions shall be made for the storage of all construction-site waste material so that contaminants from such waste material will not be leached into the storm drainage system. All construction-site waste shall be properly disposed of within fifteen (15) days after the close of construction.
(6) 
Provisions for maintenance of control facilities, including easements.
(b) 
Modifications to the erosion and sediment control plan shall be processed and approved or disapproved in the same manner as Section 15-8 of this Chapter.
[R.O. 1988 § 15-41; Ord. No. 3500 § 2, 4-1-2002]
(a) 
Grading, erosion control practices, sediment control practices and waterway crossings shall meet the design criteria set forth in the most recent version of "Protecting Water Quality" and shall be adequate to prevent transportation of sediment from the site to the satisfaction of the City. Cut and fill slopes shall be no greater than 3:1, except as approved by the City to meet other community or environmental objectives.
(b) 
Clearing and grading of natural resources shall not be permitted, except when in compliance with all other Chapters of this Code and current requirements of the U.S. Army Corps of Engineers. Clearing techniques that retain natural vegetation and drainage patterns, as described in "Protecting Water Quality" shall be used until all sediment control devices have been installed and have been stabilized.
(1) 
Phasing shall be recommended on all sites disturbing greater than thirty (30) acres, with the size of each phase to be established at plan review and as approved by the City of Rolla.
(2) 
Clearing, except that necessary to establish sediment control devices, shall not begin until all sediment control devices have been installed and have been established.
(c) 
Erosion control requirements shall include the following:
(1) 
Soil stabilization shall be completed within thirty (30) days of clearing or inactivity in construction;
(2) 
If seeding or another vegetative erosion control method is used, it shall become established within thirty (30) days or the City of Rolla may require the site to be reseeded or a non vegetative option employed;
(3) 
Special techniques that meet the design criteria outlined in "Protecting Water Quality" on steep slopes or in drainage ways shall be used to ensure stabilization;
(4) 
Soil stockpiles must be stabilized or covered at the end of each workday to prevent erosion;
(5) 
The entire site must be stabilized, using a heavy mulch layer or another method that does not require germination to control erosion, at the close of the construction season;
(6) 
Techniques shall be employed to prevent the blowing of dust or sediment from the site;
(7) 
Techniques that divert upland runoff past disturbed slopes shall be employed.
(d) 
Sediment control suggestions shall include:
(1) 
Settling basins, sediment traps, and perimeter controls;
(2) 
Settling basins that are designed in a manner that allows adaptation to provide long-term stormwater management;
(3) 
Protection for adjacent properties by the use of a vegetated buffer strip in combination with perimeter controls.
(e) 
Waterway and watercourse protection requirements shall include:
(1) 
A temporary stream crossing installed and approved by the City of Rolla if a wet watercourse will be crossed regularly during construction;
(2) 
Stabilization of the watercourse channel before, during, and after any in-channel work;
(3) 
All on-site stormwater conveyance channels designed according to the criteria outlined in the City of Rolla stormwater design standards ;
(4) 
Stabilization adequate to prevent erosion located at the outlets of all pipes and paved channels.
(f) 
Construction site access requirements shall include:
(1) 
Temporary access road provided at all sites;
(2) 
Other measures required by the City of Rolla in order to ensure that construction vehicles do not track sediment onto public streets or be washed into storm drains.