08.b3 UPDATED Engineer Comments^Tii Gavo- October 202214727 209 t h St. N. PO Box 128, Scandia , Minnesota 55073
Phone (651) 433 -2274 Fax (651 ) 433 -5112 h t t p://www.ci .sc andia.mn.us
October 18, 2022
Brenda Eklund
City Clerk
14727 209th Street N
Scandia, MN 55073
RE: Tii Gavo Second Addition Review
Dear Ms. Eklund
We have completed our review of the submittal for Tii Gavo Second Addition. All comments were
addressed by the developer. The following documents were reviewed:
• Preliminary Plat - Tii Gavo Second Addition, dated June 13, 2022.
• Stormwater Drainage Report, dated June 1, 2022
• Preliminary Civil Plan Set – Tii Gavo Second Addition, dated June 1, 2022.
• Final Plat - Tii Gavo Second Addition, dated September 20, 2022.
• Stormwater Drainage Report, dated September 21, 2022
• Civil Plan Set – Tii Gavo Second Addition, dated September 21, 2022.
• Stormwater Drainage Report, dated October 17, 2022
• Civil Plan Set – Tii Gavo Second Addition, dated October 17, 2022.
Grading, Drainage and ESC Plans
1. The project is located within Carnelian-Marine-St. Croix Watershed District. Indicate in the
drainage narrative how the rules and requirements of the watershed are being met. Plans shall
be submitted to the watershed district for review and approval.
a. Verify correct wetland buffer limits. Private driveway may be encroaching wetland
buffer on northeast portion of the site.
2. Adjust drainage and utility easement to include buffer area 4 as noted on sheet C1.4 on
construction plan set.
3. Confirm that Watershed District does not have additional floodplain modeling and/or critical
flood elevations defined in the area that may dictate creation of compensatory flood plain
excavation to mitigate filling within the floodplain.
4. Provide summary table in Drainage Narrative comparing 2-year, 10-year, and 100-year rainfall
event. The table shall include the following:
a. Existing and proposed discharge rates into existing wetland areas.
14727 209 t h St. N. PO Box 128, Scandia , Minnesota 55073
Phone (651) 433 -2274 Fax (651 ) 433 -5112 h t t p://www.ci .sc andia.mn.us
b. Existing and proposed peak water surface elevations in wetland areas.
5. All low openings shall be a minimum of 2’ higher than the 100-year high water level.
6. Update the SWPPP information to make sure the current Construction Stormwater General
Permit requirements (MNR100001) in Section 5 have been satisfied.
7. The SWPPP quantity table needs to be filled out.
8. Provide construction details for proposed pond outlet control structures and filtration areas
9. All emergency overflow elevations shall be noted.
10. Plans shall include both plan and profile views of the storm sewer and street.
11. Lots shall be graded to drain to adjacent drainage and utility easements. Drainage shall not flow
directly to adjacent lot. For example, Lot 3, Block 1 shall not drain directly onto Lot 4. Review for
each lot.
Sanitary Sewer & Water
12. Include existing sanitary sewer in plan set, including valves, curb stops, clean outs, etc.
13. The plans shall include both plan and profile views for the sanitary sewer to verify any potential
conflicts with grading and storm sewer.
14. Condition of crossing pipes shall be verified prior to street construction.
15. Each lot shall indicate the sewer station, curb box elevation, sewer service invert elevation at
the property line, and riser elevation information.
16. Show any existing wells on the plans.
17. All sanitary and water shall be privately owned and maintained.
Street Improvements
18. The proposed pavement width of Meadowridge Trl N shall be 24 ft with 2 ft shoulders.
19. The bituminous pavement thickness shall be revised to provide 4” of pavement, see comments
on typical section.
20. The street plans shall include both plan and profile views.
General Comments
21. Well system will be permitted by the Minnesota Department of Health.
22. After final restoration and turf establishment reaches 70% coverage applicant shall request final
inspection through the City of Scandia.
23. The plans shall clearly identify removals necessary, specifically at the exiting road connection at
each end. Full depth and full street width saw cut required at each connection.
24. The specification for construction shall be submitted for review with final plans.
25. Site improvements shall be coordinated with the private utility owners. Conduit crossings for
private utilities shall be shown on the construction plans.
14727 209 t h St. N. PO Box 128, Scandia , Minnesota 55073
Phone (651) 433 -2274 Fax (651 ) 433 -5112 h t t p://www.ci .sc andia.mn.us
26. A preconstruction meeting is required to be held prior to any construction activity starting on
site. The developer shall invite representatives from the City, Watershed and the private utility
owners.
27. Revised documents shall be submitted for review and acceptance prior to any construction
activity starting.
28. Please respond in writing as to how the above comments will be addressed.
29. Vertical curves between STA 20+86 and STA 23+57 do not provide sufficient stopping sight
distance. See comment on plan set on page C1.5.
30. Ensure water in sand section drains into ditch/storm sewer at low points, either by drain tile or
daylight sand section.
31. Provide verification from the watershed district that individual lot treatment is required as
homes develop throughout the site.
32. Existing total drainage area = 28.8 acres, Proposed total drainage area = 28.0 acres. Verify if
these areas should be the same or justify the difference.
33. Table 4 – Offsite Southeast indicates an increase in discharge rate for the 2-year, 10-year and
100-year event.
34. Rate control and water quality must be met for the entire subdivision per CMSCWD review. This
includes accounting for full buildout impervious areas. Each lot will be reviewed prior to
construction for volume control.
35. Make sure all EOF’s are identified.
Please do not hesitate to contact me at 612-597-7140 with any questions or comments you may have
regarding this memo.
Sincerely,
Ryan J. Goodman, P.E.
City Engineer