(A) State Pollution Control Agency (MPCA) requirements. Every applicant for a building permit, subdivision approval or a grading permit to allow land disturbing activities shall adhere to erosion control measure standards and specifications contained in the MPCA publication Protecting Water Quality in Urban Areas, as may be amended, or as approved by the City Engineer and applicable city's stormwater management requirements. All applications shall comply with the State Pollution Control Agency's National Pollutant Discharge Elimination System (NPDES) Phase II requirements.
(B) Prohibited development. No land shall be developed and no use shall be permitted that results in water runoff causing flooding, erosion or deposit of sediment on adjacent properties. The runoff shall be properly channeled into a storm drain, watercourse, ponding area or other public facilities subject to the review and approval of the City Engineer.
(C) Stormwater management. All residential, commercial, industrial and institutional developments shall satisfy the provisions of the subdivision regulations in regard to stormwater management.
(D) City Engineer approval. In the case of all single-family lots, multiple-family lots, business, industrial and institutional developments, the drainage and erosion control plans shall be subject to the City Engineer's written approval. No modification in grade and drainage flow through fill, cuts, erection of retaining walls or other actions shall be permitted until the plans have been reviewed and received written approval from the City Engineer.
(E) Approval of erosion control measures. Proposed erosion control measures may be approved by the City Engineer as part of grading plan review. Erosion control may be specified by the City Engineer as part of a site survey for individual building permits. Erosion control measures may also be specified by the City Engineer as needed and deemed appropriate during the construction and post-construction periods separate from the above.
(F) Storm sewer inlets. All storm sewer inlets which are functioning during construction shall be protected so that sediment laden water does not enter the conveyance system without first being filtered or otherwise treated to remove sediment.
(G) Stormwater channels. All on-site stormwater conveyance channels shall be designed and constructed to withstand the design volume of stormwater with appropriate stabilization to prevent scour and erosion. Erosion controls shall be provided at the outlets of all storm sewer pipes.
(H) Sediment control practices. All temporary and permanent erosion and sediment control practices shall be maintained and repaired whenever necessary to assure the continued performance of their intended function.
(I) Tracking. Each site shall have graveled roads, access drives and parking areas of sufficient width and length to prevent sediment from being tracked onto public or private roadways. Any sediment reaching a public or private road shall be removed by street cleaning (not flushing) before the end of each workday.
(J) Seeding. All disturbed ground left inactive for seven or more days shall be stabilized by seeding or sodding or by mulching or covering or other equivalent control measure.
(K) Sites over one acre. For sites with more than one acre disturbed at one time, or if a channel originates in the disturbed area, one or more temporary or permanent sedimentation basins shall be constructed. Each sedimentation basin shall have a surface area of at least 1% of the area draining to the basin and at least three feet of depth and constructed in accordance with accepted design specifications. Sediment shall be removed to maintain a depth of three feet. The basin discharge rate shall also be sufficiently low as to not cause erosion along the discharge channel or the receiving water.
(L) Sites under one acre. For sites with less than one acre disturbed at one time, silt fences, straw bales or equivalent control measures shall be placed along all side slope and down slope sides of the site. If a channel or area of concentrated runoff passes through the site, silt fences shall be placed along the channel edges to reduce sediment reaching the channel. The use of silt fences, straw bales or equivalent control measures must include a maintenance and inspection schedule.
(M) Removal. All temporary erosion control devices including silt fence, gravel, hay bales or other measures shall be removed from the construction site and properly disposed of or recycled. This removal and disposal shall occur within 30 days of the establishment of permanent vegetative cover on the disturbed area.
(N) Site dewatering. Water pumped from the site shall be treated by temporary sedimentation basins, grit chambers, sand filters, up flow chambers, hydro-cyclones, swirl concentrators or other appropriate controls as appropriate. Water may not be discharged in a manner that causes erosion or flooding of the site or receiving channels of a wetland. All dewatering shall be in accordance with all applicable county, state and federal rules and regulations.
(O) Waste and material disposal. All waste and unused building materials (including garbage, debris, cleaning wastes, wastewater, toxic materials or hazardous materials) shall be properly disposed of off-site and not allowed to be carried by runoff into a receiving channel or storm sewer system.
(P) Foundation, garage floor. Unless approved by the City Engineer, the top of the foundation and garage floor of all structures shall be at least 18 inches above the grade of the crown of the street. Elevations shall be in accordance with the approved grading plan for the development.
(Q) Stop work order. The city's Building Official or City Engineer may issue stop work orders for any violation of this chapter.
(Prior Code, § 11-16-4) (Ord. 258, passed 5-4-2006)