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72.F.3. ❑ Where owner(s)/operator(s) have not calculated the two (2)-year, 24-hour storm runoff amount, the temporary sediment basin must provide 3,600 cubic feet of live storage per acre of the basin's drainage area. 72.F.4. ❑ Owner(s)/operator(s) must design basin outlets to prevent short-circuiting and the discharge of floating debris. 72.F.5. ❑ Owner(s)/operator(s) must design the outlet structure to withdraw water from the surface to minimize the discharge of pollutants. Owner(s)/operator(s) may temporarily suspend the use of a surface withdrawal mechanism during frozen conditions. The basin must include a stabilized emergency overflow to prevent failure of pond integrity. 72.F.6. ❑ Owner(s)/operator(s) must provide energy dissipation for the basin outlet within 24 hours after connection to a surface water. 72.F.7. ❑ Owner(s)/operator(s) must locate temporary basins outside of surface waters and any required buffer zones. 72.F.8. ❑ Owner(s)/operator(s) must construct temporary basins prior to disturbing (10) or more acres of soil draining to a common location. 72.F.9. ❑ Where a temporary sediment basin meeting the requirements of this part is infeasible, owner(s)/operator(s) must install effective sediment controls such as smaller sediment basins and/or sediment traps, silt fences, vegetative buffer strips or any appropriate combination of measures as dictated by individual site conditions. In determining whether installing a sediment basin is infeasible, owner(s)/operator(s) must consider public safety and may consider factors such as site soils, slope, and available area on -site. Owner(s)/operator(s) must document this determination of infeasibility in the site plans. 72.G. Termination conditions: 72.G.1. ❑ Owner(s)/operator(s) must complete all construction activity and must install permanent cover over all areas. Vegetative cover must consist of a uniform perennial vegetation with a density of 70 percent of its expected final growth. Vegetation is not required where the function of a specific area dictates no vegetation, such as impervious surfaces or the base of a sand filter. 72.G.2. ❑ Owner(s)/operator(s) must clean the permanent stormwater treatment system of any accumulated sediment and must ensure the system meets all applicable requirements and is operating as designed. 72.F.3. ❑ Owner(s)/operator(s) must remove all sediment from conveyance systems. 72.G.4. ❑ Owner(s)/operator(s) must remove all temporary synthetic erosion prevention and sediment control BMPs. Owner(s)/operator(s) may leave BMPs designed to decompose on -site in place. 72.G.5. ❑ For residential construction only, permit coverage terminates on individual lots if the structure(s) are finished and temporary erosion prevention and downgradient perimeter control is complete and the residence sells to the homeowner. 72.G.6. ❑ For construction projects on agricultural land (e.g., pipelines across cropland), owner(s)/operator(s) must return the disturbed land to its preconstruction agricultural use. 72.H. If applicable, additional requirements for discharges to special and impaired waters: 72.H.1. ❑ Owner(s)/operator(s) must immediately initiate stabilization of exposed soil areas, and complete the stabilization within seven (7) calendar days after the construction activity in that portion of the site temporarily or permanently ceases. 72.H.2. ❑ Owner(s)/operator(s) must provide a temporary sediment basin for common drainage locations that serve an area with five (5) or more acres disturbed at one time. 72.H.3. ❑ Owner(s)/operator(s) must include an undisturbed buffer zone of not less than 100 linear feet from a special water (not including tributaries) and must maintain this buffer zone at all times, both during construction and as a permanent feature post construction, except where a water crossing or other encroachment is necessary to complete the project. Owner(s)/operator(s) must fully document the circumstance and reasons the buffer encroachment is necessary in the site plans and include restoration activities. Owner(s)/operator(s) must minimize all potential water quality, scenic and other environmental impacts of these exceptions by the use of additional or redundant (double) BMPs and must document this in the site plans for the project. 72.H.4. ❑ Owner(s)/operator(s) must conduct routine site inspections once every three (3) days for projects that discharge to prohibited waters. *73. Perm it item 19.5: Does your regulatory mechanism(s) require that owners and operators of construction activity develop site plans that must be submitted to you for review and confirmation that regulatory mechanism(s) requirements have been met, prior to the start of construction activity? ® Yes ❑ No *74. Permit item 19.6: Do you have written procedures for site plan reviews to ensure compliance with requirements of the regulatory mechanism(s)? (Note: All or some of this item is a new permit requirement. Compliance with new requirements is required within 12 months after receiving permit coverage.) ® Yes ❑ No (Skip to Q76) https://www.pca.state.mn.us 651-296-6300 800-657-3864 Use your preferred relay service Available in alternative formats wq-strm4-49a • 9123120 Page 15 of 32