Subd. 1. Grading, erosion control practices, sediment control practices, and waterway crossings shall meet the design criteria set forth in the most recent version of the Minnesota Storm Water Manual and shall be adequate to prevent transportation of sediment from the site to the satisfaction of the city.
Subd. 2. Clearing and grading of natural resources, such as forests and wetlands, shall not be permitted, except when in compliance with all other requirements and all applicable state and federal laws. Clearing techniques that retain natural vegetation and drainage patterns, as described in the Minnesota Storm Water Manual, shall be used to the satisfaction of the city.
Subd. 3. Clearing, except that necessary to establish sediment control devices, shall not begin until all sediment control devices have been installed and have been stabilized.
Subd. 4. Erosion control requirements shall include the following:
A. Soil stabilization shall be completed within five days of clearing or inactivity in construction;
B. If seeding or another vegetative erosion control method is used, it shall become established within two weeks or the city may require the site to be reseeded or a non-vegetative option employed;
C. Special techniques that meet the design criteria outlined in the Minnesota Storm Water Manual on steep slopes or in drainage ways shall be used to ensure stabilization;
D. Soil stockpiles must be stabilized or covered at the end of each workday. 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;
E. Techniques shall be employed to prevent the blowing of dust or sediment from the site;
F. Techniques that divert upland runoff past disturbed slopes shall be employed.
Subd. 5. Sediment control requirements shall include:
A. Settling basins, sediment traps, or tanks and perimeter controls;
B. Settling basins that are designed in a manner that allows adaptation to provide long-term storm water management, if required by the city;
C. Protection for adjacent properties by the use of a vegetated buffer strip in combination with perimeter controls.
Subd. 6. Waterway and watercourse protection requirements shall include:
A. Stabilization of the watercourse channel before, during, and after any in-channel work;
B. All on-site storm water conveyance channels designed according to the criteria outlined in the Minnesota Water Manual; and
C. Stabilization adequate to prevent erosion located at the outlets of all pipes and paved channels.
Subd. 7. Construction site access requirements shall include:
A. A temporary rock construction entrance provided at all sites. Rock shall be crushed 1-1/2 inch diameter, minimum. The dimensions shall be 20 feet by 50 feet with a depth of at least nine inches;
B. Other measures required by the city in order to ensure that sediment is not tracked onto public streets by construction vehicles or washed into storm drains.
(Ord. 553, passed 8-6-07)