Agenda - Public Works Committee - 06/17/2014

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Sec 117.384-410 Revised June 5, 2014 to include 2013 Construction Stormwater Permit, 2013 MS4 Permit requirements and 2012 LRRWMO Third Generation Plan [deletion;,, additions] 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. (7) Sediment basins related to impervious surface area. Where a project's ultimate development replaces surface vegetation with one or more acres of cumulative impervious surface, and all runoff has not been accounted for in a local unit of government's existing stormwater management plan or practice, the runoff must be discharged to a wet sedimentation basin prior to entering waters of the state. At a minimum the work must conform with the current version of the Minnesota Pollution Control Agency's publication entitled "Protecting Water Quality in Urban Areas," and the current requirements found in the same agency's NPDES/SDS permits for stormwater associated with construction activities. (8) Generally, sufficient silt fence will be required to hold all sheet flow runoff generated at an individual site, until it can either infiltrate or seep through silt fence's pores. (9) Temporary stockpiling of 50 or more cubic yards of excess soil on any lot or other vacant area will not be allowed without issuance of a grading permit for the earth moving activity in question. (10) Concrete truck wash out. The permittee must designate a location for wash out of concrete trucks and equipment. Sites that are one acre or more must provide a station for washing out concrete trucks and equipment. The location of the wash out area or wash out station shall preclude the drainage of concrete and water from the washing activities to a stormwater facility or water resource. (11) Waste and material collection and disposal. All waste and unused building materials (including garbage, debris, cleaning wastes, litter, wastewater or sewage, toxic materials or hazardous materials) shall be properly contained while on site, properly disposed of off -site, and not allowed to be carried by water and/or wind off the site or into a receiving channel or storm sewer system. Waste containers and all construction materials shall not be placed or stored such that they obstruct, encroach upon, or interfere wholly or in part with any public right-of-way, including but not limited to, public roadways, trails, sidewalks, parks or other public properties. (12) For soil stockpiles greater than ten cubic yards the toe of the pile must be more than 25 feet from a road, drainage channel or stormwater inlet. If such stockpiles will be left for more than seven days, they must be stabilized with mulch, vegetation, tarps or other means. If left for less than seven days, erosion from stockpiles must be controlled with silt fences or rock check dams. If for any reason a soil stockpile of any size is located closer than 25 feet from a road, drainage channel or stormwater inlet, and will be left for more than seven days, it must be covered with tarps or controlled in some other manner. Ramsey, Minnesota, Code of Ordinances Page 5