Agenda - Planning Commission - 08/07/2014

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Sec 117.384-410 Revised July 29, 2014 to include 2013 Construction Stormwater Permit, 2013 MS4 Permit requirements and 2012 LRRWMO Third Generation Plan [deletion;,, additions] Sec. 117-391. - Minimum stormwater pollution control measures and related inspections. These minimum control measures are required where bare soil is exposed. Due to the diversity of individual construction sites, each site will be individually evaluated. Where additional control measures are needed, they will be specified at the discretion of the city engineer. The city will determine what action is necessary to prevent excessive erosion from occurring on the site. (1) All grading plans and building site surveys must be reviewed by the city for effectiveness of erosion control measures in the context of the site topography and drainage. (2) Sediment control measures must be properly installed by the builder before construction activity begins. Such structures may be adjusted during dry weather to accommodate short-term activities, such as those that require the passage of very large vehicles. As soon as this activity is finished or before rainfall, the erosion and sediment control structures must be returned to the configuration specified by the city. A sediment control inspection must then be scheduled, and passed before a footing inspection will be done. Diversion of channeled runoff around disturbed areas, if practical, or the protection of the channel. (3) (4) Easements. If a stormwater management plan involves directing some or all of the site's runoff, the applicant or his designated representative shall obtain from adjacent property owners any necessary easements or other property interests concerning the flowing of such water. (5) The scheduling of the site's activities to lessen their impact on erosion and sediment creation, so as to minimize the amount of exposed soil. (6) Control runoff as follows (Either subsection (6)a and b and (6)a and c of this section): a. Unless precluded by moderate or heavy snow cover (Mulching can take place if a light snow cover is present.), stabilize all exposed inactive disturbed soil areas within 100 feet of any water of the state, or with in 100 feet any conveyance (curb, gutter, storm sewer inlet, drainage ditch, etc.) to a water of the state with sod, seed or weed free mulch. This must be done, if the developer will;k has not worked the area for seven days on slopes greater than three feet horizontal to one foot vertical (3:1), 14 days on slopes ranging from 3:1 to 10:1 and 21 days for flatter slopes. b. For disturbed areas greater than five acres construct temporary or permanent sedimentation basins. Sedimentation basins must have a minimum surface area equal to at least one percent of the area draining to basin, and be constructed in accordance with accepted design specifications including access for operations and maintenance. Basin discharge rates must also be controlled to prevent erosion in the discharge channel. The applicant is required to obtain a National Pollutant Discharge Elimination System/State Disposal System (NPDES/SDS) construction stormwater permit from the Minnesota Pollution Control Agency for any project that disturbs five acres or more of land. c. For disturbed areas less than five acres sedimentation basins are encouraged, but not required, unless specifically required by the city engineer. The applicant shall install erosion and sediment controls at locations directed by the city. Minimum requirements include silt fences, rock check dams, or other equivalent control measures along slopes. Silt fences are required along channel edges to reduce sediment reaching channel. Silt fences, rock check dams, etc., must be regularly inspected and maintained. Ramsey, Minnesota, Code of Ordinances Page 5