When doing inspections:
The project’s final plans and specifications, which include both temporary and permanent control plan requirements, must be available at the construction site in either a field office or an inspector’s or contractor’s vehicle.
Temporary Erosion and Sediment Control Plan, completed in accordance with the permit Appendix A must be available within 24 hours.
Permanent Erosion and Sediment Control Plan, completed in accordance with the permit Appendix B must be available within 24 hours.
Records of all inspections must be available within 24 hours, including:
If the records requirements are not being complied with, it may be a violation of permit provisions (see permit provisions parts I.C.1, I.C.2.a, I.C.2.b, I.C.2.c).
A notice of stormwater permit coverage card must be placed in a visible location at the construction site throughout the duration of the project. The card can be placed at any of the following locations:
• for linear utility and noncontiguous municipal projects (i.e., city street improvements), at the office responsible for the project’s administration.
If the records requirements are not being complied with, it is a violation of permit provisions (see permit provisions parts I.C.2.d, I.C.3).
Erosion Control. Permittee must use horizontal slope grading, construction phasing, temporary diversions, and/or other practices that minimize erosion.
Exposed slopes within 100 lineal feet from a water of the state, or from a curb, gutter, storm sewer inlet, or temporary or permanent drainage ditch that is connected to a water of the state should have temporary protection or permanent cover within the following time frames:
If erosion control is not being complied with, it is a violation of permit provisions (see permit provisions parts I.D.1.a, I.D.1.b).
Ditch and Outlet Stabilization. The bottom of any temporary or permanent drainage ditch constructed to drain water from a construction site must be stabilized within 100 lineal feet from a water of the state. Stabilization must be initiated within 24 hours of connecting the drainage ditch to a water of the state, existing gutter, storm sewer inlet, drainage ditch or other stormwater-conveyance system that discharges to waters of the state. Stabilization must be completed within five calendar days. (Note: Normally this should be completed before connection)
Before to connecting any pipe to a water of the state or drainage ditch, the pipe’s outlet must be provided with temporary or permanent energy dissipation to prevent erosion.
If the ditch and outlet stabilization is not being complied with, it is a violation of permit provisions (see permit provisions parts I.D.1.c, I.D.1.d).
All down gradient perimeter sediment-control bmps must be in place before any up gradient land-disturbing activity begins.
The permittee must minimize vehicle tracking of sediment off-site wherever vehicles exit the construction site onto paved surfaces. In areas where curb and gutter exist, inlet protection must be in place, along with a plan to keep impervious surfaces free of sediment.
Where 10 or more contiguous acres of exposed soil contribute to a discernible point of discharge, temporary sedimentation basins meeting the following criteria must be provided prior to runoff leaving the site of entering waters of the state:
• Basin outlets must be designed to prevent short circuiting and the discharge of floating debris.
If the perimeter controls are not being complied with, it is a violation of permit provisions (see permit provisions parts I.D.2.a, I.D.2.b, I.D.2.c.1, I.D.2.c.2).
If permanent ponds are required, they can often be used in place of temporary ponds, but construction sediment should be removed before final Notice of Termination has been submitted.
Inspect all erosion- and perimeter-sediment-control BMPs to ensure integrity and effectiveness. All nonfunctional perimeter-sediment-control BMPs should be repaired when the trapped sediment reaches one-third of the height, or replaced or supplemented with functional BMPs within 24 hours of discovery. All nonfunctional erosion-control BMPs should be repaired or replaced within 24 hours of discovery, or as soon as field conditions allow access.
Inspect all sedimentation basins to ensure their effectiveness. When the depth of the sediment collected in the basin reaches the heights of the riser, or the storage volume, the basin should be drained and the sediment removed within 72 hours of discovery, or as soon as field conditions allow access.
If inspection and maintenance is not being complied with, it is a violation of permit provisions (see permit provisions parts I.E.1.a, I.E.1.b).
Inspect all drainage ditches and other waters of the state for evidence of sediment leaving the site. Unless the project has received approval or certification for depositing fill into waters of the state, the permittee should remove all sediment in drainageways, catch basins or other waters of the state and restabilize the areas where sediment removal results in exposed soil. The removal and stabilization must take place within seven days of discovery unless precluded by legal, regulatory or physical access restraints. If precluded, removal and stabilization must take place within seven calendar days of obtaining access.
Inspect all construction site vehicle exit locations for evidence of sediment being tracked off-site. Sediment should be removed from paved surfaces which do not drain back into the construction site within 24 hours of discovery.
If sediment leaving the site is not being inspected and corrected, it is a violation of permit provisions (see permit provisions parts I.E.1.c, I.E.1.d).
Alleged violations must be brought to the attention of the on-site general contractor and representative of the owner (if that person is present) before leaving the site.
Inspectors should follow this procedure:
Violations not remediated in accordance with the time frames specified in the permit are subject to MPCA enforcement action, pursuant to Minn. Stat. §§ 115.071, 116.072, and 609.671, for violation of water-quality environmental laws.
General information to be included with or as part of the Resource Management Plan (RMP):
List new impervious area for each subwatershed (if 1 acre or more drains to a discernible point, a wet detention pond is needed for treatment of runoff prior to discharge to water of the state according to W.W. Walker criteria. If development does not require a pond based on these standards and the development will be creating over an acre of impervious, a wet detention pond is still needed).
Once the planner has decided upon methods of pollution prevention and control, the plan must be implemented. Work that is being constructed under unit-priced contracts will require a clear and concise explanation of the requirements in contract documents.
The specifications for the job should include a detailed description of the pollution-preventionand- control work required, stating clearly what is required, when it is required and who is responsible for carrying it out. Do not rely upon a boilerplate statement of the contract that states that the contractor must comply with all local ordinances to cover all pollution-prevention-andcontrol work. Any work that will be required should be clearly described and included in appropriate bid items. Unit-priced bid items are suggested because they provide more flexibility for quantity variations than do lump-sum bid items. A sample contract specification for including details on this work is shown below.
The best construction-and-management practices possible will not help if they are not installed at the proper time. The contract should specify that sediment-control structures must be installed before the contributing drainage area is disturbed. There are times when this may not be possible, but those are the exception and not the rule. Also, sediment-control structures will not be effective unless they are maintained. Specifications should indicate how and when practices should be maintained. Another provision that may be important to include on some jobs is to require approval for the contractor to open new work areas. This provision is not intended to prevent the contractor from having an efficient operation; it is intended to prevent areas from being stripped several months before they are needed. It also provides an opportunity to discuss sediment-control measures for the area that is about to be opened.
The drawings for a job should show the location for planned pollution-prevention-and-control structures. Details of structures should also be shown so they are installed and maintained properly. During construction, change orders may be needed to address additional pollution-preventionand-control needs that are identified in the field. Also, the contractor’s operation may eliminate the need for certain measures or may alter the location where they will be most effective. All changes to the plan should be documented.