5.2. PCSR 12-18-2018 - Laserfiche WebLink

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4. MnDNR will follow up with comments regarding requirements for state floodplain and the Mississippi River Wild and Scenic and Recreational requirements. 5. The project must meet all state and city ordinance requirements for the floodplain regulation. 6. Submit soil borings and infiltrometer tests for all proposed infiltration basin areas. 7. Submit soil borings for the proposed infiltration basin (within proposed area) in order to identify water baring soils. The infiltration basin details must meet state requirements and have a separation of 3’ from the proposed bottom of the basin and water baring soils. 8. Stormwater pre-treatment is required prior to any proposed infiltration basins. 9. The plans show a basin bottom of 861.00 but the stormwater report lists 860.00. This needs to be addressed. 10. The proposed 18” FES needs to discharge within the basin sidewall, not short of the basin within the hillside, also, include energy dissipation according to city standards. 11. Will the existing 18” FES and stormwater system stay on-line or be abandoned? If so, HydroCAD needs to be included for this and the basin needs to be cleaned out to original design or enlarged based on requirements. 12. The proposed stormwater lines show it tying together at CB #8, provide detail of how this will work. 13. Provide pipe sizing chart report. 14. Show parking lot contours, direction of flow and grade percentages. Also, show pipe slope percentages. 15. Indicate where all roof drainage is being directed to, and not which CB #. 16. The city was not able to review the proposed stormwater system for the ‘proposed 4-story apartment building’ because it is cut off on page C-2, update accordingly. 17. Submit long term maintenance plan for all BMPS. 18. Submit for SWPPP for review in accordance with the NPDES permit. 19. Construction may not commence until a NPDES Permit is issued and the stormwater design is approved. 20. Submit full MIDS report. 21. Staff reserves the right to continue review of all site, grading and utility plans. Environmental: 1. MnDNR will follow up with comments regarding requirements for state floodplain and the Mississippi River Wild and Scenic and Recreational requirements. 2. Provide before and after hardcover calculations for the Saxon site. Ordinance limits impervious surfaces to 25% or no net increase. 3. Section 30-2022 requires a 30 foot setback from the top-of-bluff. Move structures outside of the setback. 4. Submitted plans showing the hardcover calculations. Sketches indicate the area inside the building, courtyard, will have impervious surfaces. a. If land along the river is dedicated for park use, the hardcover calculations will change. Updated plans will be required based on park recommendations. 5. The proposed site does not meet setbacks from the Mississippi River, does not meet bluff setbacks and potential grading plans are concerning from an environmental standpoint. Bluff destabilization is the biggest concern overall for proposed project. There is no wetland delineation on file for this site. Any encroachment into the bluff setback or bluff area may require approval from the Department of Natural Resources. As submitted previously, there