Agenda - Planning Commission - 08/02/2018

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North Dayton Development AUAR The proposed project will not involve physical or hydrologic alterations of surface waters. MITIGATION MEASURES (QUESTION 11): • A Stormwater Pollution Prevention Plan (SWPPP) must be prepared to ensure compliance to applicable regulations. The plan will include references to the following: o Erosion control blanket will be placed as soon as feasible after the slopes are constructed o Only "wildlife friendly" erosion control mesh will be used o Permanent vegetation installation procedures will follow MNDOT's "Standard Specifications for Construction", 2005 edition, as may be amended • Discharge rates will not exceed the existing rates for 2, 10, and 100 year storm events. • Phosphorus loading in the discharged stormwater runoff will not exceed existing phosphorus loading. ■ Infiltration of 1 inch of runoff from new impervious surfaces will be provided, where feasible. • The project will comply with all applicable setbacks and ordinances, including a 150 foot setback from Public Water Wetland 27-124 and an undisturbed 100 foot buffer zone from the Mississippi River. ■ Steep slopes will be protected to avoid downstream degradation of soils. ■ Duration of disturbed soils will be minimized through construction phasing. • All wetlands mitigation will be completed on -site or purchased from an approved wetland bank within Hennepin County. • In -water construction activity will be avoided, but where it does occur best management practices such as silt curtain will be utilized. 12. Contamination/Hazardous Materials/Wastes a. Pre -project site conditions - Describe existing contamination or potential environmental hazards on or in close proximity to the project site such as soil or ground water contamination, abandoned dumps, closed landfills, existing or abandoned storage tanks, and hazardous liquid or gas pipelines. Discuss any potential environmental effects from pre -project site conditions that would be caused or exacerbated by project construction and operation. Identify measures to avoid, minimize or mitigate adverse effects from existing contamination or potential environmental hazards. Include development of a Contingency Plan or Response Action Plan. Based on past land uses and review of the Minnesota Pollution Control Agency's What's in My Neighborhood database, environmental hazards are not expected to be found in the study area. A majority of the subject site is still currently used for agricultural purposes with portions of the property 25