(A) No permit shall be issued unless a natural resources management plan is submitted to and approved by the city. All natural resource management plans shall include the following:
(1) General information.
(a) Delineation of the subject property and the location of existing and proposed buildings, structures and impervious surfaces on the subject property;
(b) Description of the construction or land disturbing activity to be performed on subject property and proposed project schedule;
(c) Identification of all water bodies located on and adjacent to the subject property’s boundaries;
(d) Identification of all protective buffer zones which are required herein in connection with the project for any existing or proposed water body;
(e) Topographical data, including contours at vertical intervals of not more than two feet, except that contour lines shall be no more than 100 feet apart;
(f) Temporary benchmarks shall be established within the boundaries of the project area. Descriptions, reference ties and elevations of the benchmarks shall be furnished to the City Engineer. All elevations, topography and vertical control data shall be tied to sea level datum, 1929 general adjustments; and
(g) The location and size of all existing sanitary, water, or storm sewer trunks, laterals or services on or adjacent to the property.
(2) Erosion and sedimentation control and pollution prevention component (ESCC). As part of the natural resources management plan:
(a) All applicants shall submit an ESCC, which shall consist of the following:
1. Delineation of all areas to be graded or excavated, and the limits of land disturbing activities;
2. Identification of measures to be utilized to control erosion and sedimentation within and from the subject property during the project activity as required herein;
3. Identification of all permanent erosion control measures and a completion schedule;
4. Identification of the location of dirt or soil storage or stock pile areas to be utilized on the subject property; and
5. Identification of all illicit discharge prevention measures; and
6. Identification of all measures to be utilized to protect water bodies and buffer zones and prevent pollution;
(b) The ESCC of the natural resources management plan shall identify and require the “best management practices” (BMPs) for temporary and permanent erosion and sedimentation controls and pollution prevention that are deemed acceptable by the city. Required BMPs include, but are not limited to:
1. Perimeter sediment control devices;
2. Temporary erosion control practices;
3. Storm drain inlet protection devices;
4. Rock construction entrance;
5. Tree drip line or critical root zone perimeter protection for trees;
6. Removal of all debris, dirt and soil from impervious ground surfaces, including abutting public or private roadways and sidewalks, in connection with the subject property;
7. Designated concrete washout; and
8. Any other erosion and sedimentation control device or pollution prevention measure as deemed necessary by the city to prevent pollution or protect public health, welfare, or safety.
(3) Tree preservation component, TPC. As part of the natural resources management plan:
(a) All applicants shall submit a TPC, which shall consist of the following:
1. An accurate inventory of significant trees on the subject property, including identification of the size, species, condition and location of each significant tree. On large wooded sites, forest measuring methods may be used to determine the total diameter inches of trees outside the area of the proposed land-disturbing activity;
2. Identification of all significant trees proposed to be removed or that will be lost as a result of the land-disturbing activity;
3. Identification of the number, type and size of significant trees required to be replaced or for which tree loss mitigation is required herein;
4. Identification of the number, type, size and location of the required replacement trees as required herein;
5. Identification of the number, type, size and location of significant trees to be preserved; and
6. Identification of measures to be utilized to protect and preserve the significant trees proposed to be preserved.
(b) The TPC shall identify and require the following tree protective measures:
1. Protective fencing around the outer edge of the critical root zone of all significant trees to prevent sedimentation, trenching, stockpiling, soil compaction or any other root damaging activity within the critical root zone of any trees; and
2. Pruning paint applied to any damaged bark or branch of any oak tree at any time between and including April 1 and October 31.
(4) Drainage and grading component (DGC). As part of the natural resources management plan:
(a) All applicants shall submit a DGC, which shall consist of the following:
1. Identification of proposed contour grading on the site and the amount to be removed from the site;
2. The estimated time required to complete the work and the amount of material to be moved on the site and the amount to be removed from the site;
3. A map showing the stages or limits of grading together with the existing or proposed finished elevations based on sea level readings;
4. Identification of proposed building bench elevations and direction of flow of surface water within each lot;
5. Methods of controlling dust;
6. Submission of grading and engineering specifications and reports in accordance with Uniform Building Code Chapter 33 and Appendix Chapter 33;
7. Submission of preliminary plans or program for water supply, sewage disposal, drainage and flood control;
8. A planting plan for all vegetated BMPs;
9. Identification of and specification for all permanent storm water management facilities;
10. Soil borings, if required by the City Engineer; and
11. Any other information deemed necessary by the city for compliance with any applicable operational plan, as defined herein;
(b) Drainage and grading design requirements shall be as follows.
1. No land shall be disturbed and no use shall be permitted that results in water run-off, causing flooding or erosion on adjacent property. The run off shall be properly channeled into a storm drain, watercourse, ponding area or other suitable facility;
2. A drainage plan for all new commercial, industrial, multiple residential and institutional developments shall provide for a 3.6 inch rainfall in 24 hours as calculated in accordance with the modeling SCSTR-20 methodology and compliance with any applicable governmental entity’s watershed management plan requirements;
3. No land disturbing activity or use shall be permitted that results in loss of flood storage for the 100-year High Water Level of any waterbody;
4. The plan shall meet the water quality, volume, and rate control standards and policies of the city’s other code regulations and approved city operational plans. In the event the city code regulations or city operational plans conflict, the most restrictive standard shall apply;
5. Pond outlets and overflows shall be located above the seasonably high water table except where it can be demonstrated there is a risk of seepage damage to existing structures;
6. All infiltration and filtration permanent storm water treatment devices shall be protected from compaction, sedimentation, or any other disturbance that may inhibit function; and
7. Within a shoreland overlay district, existing natural drainageways, and vegetated soil surfaces must be used to convey, store, filter, and retain stormwater runoff before discharge to public waters, when possible. Development must be planned and conducted in a manner that will minimize the extent of disturbed areas, runoff velocities, erosion potential, and reduce and delay runoff volumes. Disturbed areas must be stabilized as soon as possible and appropriate facilities or methods used to retain sediment on the site. New constructed stormwater outfalls to public waters must be consistent with Minn. Rules, Rule 6115.
(5) Protective buffer zone component (PBC). As part of the natural resources management plan, all applicants whose project will require establishment of a protective buffer zone shall submit a PBC, which shall consist of the following:
(a) Identification of any existing erosion problems and any weeds or rank vegetation in the area adjacent to existing waterbodies which would constitute the buffer zone; and
(b) A buffer establishment and planting plan, which shall consist of the following:
1. Plant list and/or seed mix to be used;
2. The proposed location of the plants;
3. The proposed method to remove any noxious weeds or rank vegetation with the buffer zone;
4. The proposed method to correct existing erosion problems in the buffer zone;
5. Method of planting; and
6. Any materials used, including but not limited to erosion and sediment control measures, fertilizers, pesticides, and the like.
(B) In addition to all other plan requirements in this chapter, any applicant conducting land-disturbing activity that disturbs one or more acres of total land area or disturbs less than one acre but is part of a common plan of development or sale that will ultimately disturb at least one acre shall comply with the following additional requirements:
(1) The applicant and property owner, if not the applicant, shall apply for and be issued a National Pollution Discharge Elimination System (NPDES) permit from the Minnesota Pollution Control Agency (MPCA); and
(2) The applicant and property owner, if not the applicant, shall submit to the city an approved copy of the storm water pollution prevention plan as required for the NPDES by the MPCA.
(Ord. 633, passed 10-9-97; Am. Ord. 712, passed 4-25-02; Am .Ord. 864, passed 6-11-09; Am. Ord. 1103, passed 11-23-21)