The following is from the University of Minnesota Standards & Procedures for Construction and current as of November 2002. Please check Temporary Erosion and Sediment Controls - Page 11 #7 at http://www.cppm.umn.edu/standards/Division1.pdf for updated requirements.
7. Temporary Erosion and Sediment Controls
7.1. General Requirements: As identified in the Program Information/General Requirements section, Basic Design Requirements of these construction standards, the A/E must include temporary and permanent erosion and sediment control measures as part of the construction specification. In general, guidance on temporary erosion and sediment control measures can be found at http://www.pca.state.mn.us/water/pubs/sw-bmpmanual.htm and at http://www.metrocouncil.org/environment/watershed/bmp/manual.htm. Specifically, the erosion and sediment control measures must comply with City of Minneapolis Erosion Control, Ramsey County Erosion and Sediment Control Handbook and City of Duluth Erosion Control Requirements as applicable. These measures include, but are not limited to, silt fences, storm inlet protection and entry/exit provisions to minimize tracking and stabilize exposed soil.
7.2. Silt Fences: Silt fences must be installed down gradient from all disturbed areas prior to beginning construction. The A/E shall identify on the construction plans specifically where the silt fences shall be installed to control sediment migration for the construction site. Install silt fences with posts 4 feet apart or shorter. Drive posts at least 2 feet into the ground. Anchor the silt fence in a trench that is at least 6 inches wide and 6 inches deep on the upside slope of the posts. Lay fabric in trench, backfill trench and compact it. Make splices in fabric at fence posts. Overlap fabric at least 6 inches. Silt fence post shall be at least 2-inch square or larger hardwood pine, T-section or U-section steel posts that weigh no less than 1 pound per lineal foot.
7.3. Storm Inlet Protection
7.3.1. PROHIBITED: Bales or fabric under grates.
7.3.2. Install inlet protection at all catch basins and storm sewer inlets that could possibly receive runoff from the construction site. Catch basin inserts or staked silt fences are preferred.
7.4. Street Sweeping: Remove all soil and sediment tracked or otherwise deposited on public or private pavement areas. Remove soil and sediment on a daily basis. Street washing is only allowed after sweeping or shoveling sediment from the areas.
7.5. Construction Site Vehicle Entry/Exit: Before beginning construction, install temporary rock construction exit(s) at each point where vehicles exit the construction site. Use 1-inch and 2-inch diameter rock such as MNDOT CA-1 or MNDOT CA-1 Course Aggregate. Place the aggregate in a layer at least 6 inches thick across the entire width of the exit(s). Extend the aggregate at least 50 feet into the construction site. Use geotextile fabric beneath the fabric to prevent migration of soil into the rock from below. If this control measure does not adequately control sediment tracking onto paved surfaces, a tire wash station shall be added.
7.6. Site Stabilization: All disturbed areas shall be stabilized according to MPCA Construction Site Storm Water Requirements. All exposed soil areas with a continuous positive slope within 100 lineal feet of state waters, or from a curb, gutter, storm sewer inlet, temporary or permanent drainage ditch or other storm water conveyance, shall have temporary protection or permanent cover within the following timeframes. For slopes steeper than 3:1, temporary protection or permanent cover shall be established within seven days of disturbance if the contractor has not been or will not be working in the area. For slopes between 10:1 and 3:1, temporary protection or permanent cover shall be established within 14 days of disturbance if the contractor has not been or will not be working in the area. For the purpose of this provision, exposed soil areas do not include stockpiles or surcharge areas of sand, gravel, aggregate, concrete or bituminous.
7.7. Inspections: At a minimum, the contractor shall inspect each erosion and sediment control-device after it rains or weekly, whichever is applicable. The contractor shall keep copies of inspection logs in the site trailer that identify which items were inspected and what corrections were made, as applicable.
7.8. Discharge
7.8.1. PROHIBITED: Concrete truck washout and other construction generated wastes being discharged into storm sewers.
7.8.2. Any storm water discharge from a construction site must be visibly free of sediment and contain only rainwater.
7.8.3. Refer to Division 15 - Mechanical, Section 15025 - Storm Drainage for more information.
7.9. Maintenance: The contractor shall maintain all temporary erosion and sediment control measures until the project is complete or final site stabilization. The contractor shall replace or repair damaged or defective erosion and sediment control measures. The contractor also shall completely remove all temporary erosion and sediment control measures upon completion of the project or final site stabilization.