Agenda - Council - 12/14/2021 - Laserfiche WebLink

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MINNESOTA POLLUTION CONTROL OL AGENCY 520 Lafayette Road North I St.Paul,Minnesota 55155-41 4 1 651-296-6300 800-657-3864 1 Use your preferred relay service I info.pca@state.rnn.us I Equal Opportunity ty Employer October 26, 2021 Bruce Westby City Engineer City of Ramsey 7550 Sunwood Drive Northwest Ramsey, MN 55303 RE: Trott Brook Crossing Environmental Assessment Worksheet Dear Bruce Westby: Thank you for the opportunity to review and comment on the Environmental Assessment Worksheet (EAW)for the Trott Brook Crossing project(Project) in the City of Ramsey,Anoka County, Minnesota. The Project consists of a new residential development. Regarding matters for which the Minnesota Pollution Control Agency(MPCA) has regulatory responsibility or other interests, the MPCA staff has the following comments for your consideration. Permits and Approvals Required (Item 8) Although there are less than 2 acres of permanent wetland impacts, Item 8 should still include the MPCA Clean Water Act Section 401 Water Quality Certification as a required permit. For further information about the 401 Water Quality Certification process, please contact Jim Brist at 651-757-2245 or i i m.brist@state.m n.us. Water Resources(Item 11) • The EAW indicates that the Stormwater Pollution Prevention Plan (SWPPP)for the Project will be submitted to MPCA for review and approval prior to obtaining National Pollutant Discharge Elimination System/State Disposal System (NPDES/SDS) Construction Stormwater Permit(CSW Permit) coverage due to disturbing more than 50 acres and the ability to discharge to an impaired water. Due to the water impairment,the SWPPP will need to include the requirement to stabilize inactively worked soils within 7 days to temporarily or permanently ceasing soil disturbing activity on any portion of the site. A temporary sediment basin will be required where 5 or more acres of land drain to a common location. • The Project must also avoid soil disturbance within 50 feet of existing buffers to wetlands on the site unless necessary to complete the construction. If the 50 foot buffer must be encroached,then redundant(double) downgradient sediment controls must be installed to protect these water bodies.The requirement must be included in the SWPPP for the Project. • The EAW indicates that infiltration basins will be utilized to reduce stormwater volume for 1 inch of stormwater runoff. However,the EAW also discusses use of stormwater ponds meeting National Urban Runoff Program pond requirements which are not recognized by the CSW Permit. It is important to note that stormwater management should be achieved in upland areas and that no wetlands on the site maybe be utilized for stormwater runoff without going first going through the wetland mitigation process.