7.3. SR 01-16-2018 - Laserfiche WebLink

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Stormwater 7. All home low openings must have a minimum of 1’ freeboard from any HWL or EOF - whichever is higher. 8. The wetland along the East side of Edison Ct NW may need to have an EOF to I-basin 4. 9. List culvert elevations at Cleveland St. north of lot 424. Will this be the EOF for both wetlands to the west of this culvert? 10. All proposed driveway grades must be less than 8%. Optimal grades are about 4-5%. Please work to achieve optimal grades where possible. 11. Submit full HydroCAD for the proposed development with new 12 lot addition included. 12. Need elevations and cross sections for all storm culverts/pipes. 13. List the lowest opening lookout elevation for proposed FB/SL homes. 14. I-basin 13 and 14 don’t appear to provide 3 ft. of separation between the bottom of the proposed basin and approximate groundwater elevation of 906’ (based on wetland elevation). Soil borings may have to be provided to ensure adequate separation. 15. Proposed grading for side slopes must be 3/1 or flatter. 16. Following an updated submittal, the full SWPPP will be reviewed. Environmental 17. The proposed bridge over Trott Book on the west side of Twin Lakes Parkway will impact wetlands and will require a formal Wetland Conservation Act decision. 18. The Edison Ct cul-de-sac is not meeting the 45 foot setback and has a proposed retaining wall along the southwest portion of the wetland basin. Relocate the retaining wall to be as close to the roadway as possible rather than following the 25 foot wetland edge. Additionally, who shall own the retaining walls into the future? The city does not desire to own and maintain any retaining walls. 19. All existing and disturbed vegetation within the 25 ft. buffer shall be maintained in accordance with city code section 30-1853. All wetland buffer and buffer strip setback areas within the outlots should be seeded with wetland vegetation or planted with appropriate upland species approved by city staff. 20. Additional retaining walls will not be permitted within the 45 ft. wetland setback (buffer and buffer setback). Retaining walls are considered hardcover and are not permitted in the wetland setbacks of individual properties and are not permitted in the 20 ft. rear yard structure setback. 21. The house lot-fit plan shows a possible encroachment of parcel #480 within the wetland setback and #486 within the utility easement. Please verify that they do not encroach. 22. Show the HWL of each wetland adjacent to proposed single family residential parcels. 23. The 25’ wetland buffer must be signed at each property line or every 200 feet, whichever is less.