ITEM 3.2_Eng ReportReview No. 1
�Hal<anson
���Anderson
ENGINEERING REVIEW
Residential Subdivision
for the City of Otsego
by
Hakanson Anderson
Submitted to: Honorable Mayor and City Council
cc: Lori Johnson, Administrator
Tami Loff, City Clerk
Dan Licht, City Planner
Andy MacArthur, City Attorney
Brent Pobuda, Katricia, LCC & Hedberg Homes, Inc.
Brian Krystofiak, P.E. Carlson McCain
Reviewed by: Ronald J. Wagner, P.E.
Brent M. Larson, P.E.
Date: July 14, 2016
Proposed
Development: The Villas in Otsego
Street Location A portion of Section SWI/4 of the SE %4 of Section 26, T121, R23
Of Property: North of CSAH 37 (70th Street) and West of Quenroe Avenue
Applicant: Brent Pobuda
Developer: Katricia, LCC and Hedberg Homes, Inc.
2221 108th Lane, NE
Blaine, MN 55449
Owners of Record: Katricia, LCC and Hedberg Homes, Inc.
Purpose: The Villas in Otsego is a proposed 26 lot detached townhome
residential development within the Wildflower Meadows plat in
the City of Otsego, Wright County, Minnesota. The proposed
development will be served with municipal water, sanitary sewer,
storm sewer, and public streets typical of an urban setting.
Jurisdictional Agencies: City of Otsego, Wright County, Minnesota Department of
(but not limited to) Health, Minnesota Department of Natural Resources, Minnesota
Pollution Control Agency, Wright Soil and Water Conservation
District.
Permits Required: NPDES, Minnesota Department of Health (water),
(but not limited to) Minnesota Pollution Control Agency (sanitary sewer), and Wright
County
TABLE OF CONTENTS
INFORMATION AVAILIBLE
PRELIMINARY PLANS
COVER SHEET
EXISTING CONDITIONS
PRELIMINARY PLAT
SUBDIVISION CONFIGURATION, LOT SIZE, DENSITY
STREET/TRAFFIC/ACCESS
REMOVALS
PRELIMINARY SITE AND UTILITY PLAN
PRELIMINARY EROSION CONTROL AND GRADING PLAN
SURFACE WATER MANAGEMENT
WETLANDS
OTHER CONSIDERATIONS
SUMMARY AND/OR RECOMMENDATION
PAGE 2
C:\Users\Tami.OTSEGO\AppData\Local\Microsoft\Windows\INetCache\Content.0utlook\1HD3FVW1\ot2334 RVW1.doc
INFORMATION AVAILABLE
Preliminary Plan submittal for The Villas in Otsego, dated 6117/16, by Carlson McCain
Storm Sewer Design Calculations for The Villas in Otsego, dated 6/15/16, by Carlson McCain
Stormwater Management Plan for The Villas in Otsego, dated 6/17/16, by Carlson McCain
Wildflower Meadows
Construction Plans for Wildflower Meadows, 4/10/07 revision, by Pioneer Engineering
Final Grading Plans for Wildflower Meadows, 4/10/07 revision, by Pioneer Engineering
Storm Sewer Design for Wildflower Meadows, 4/10/07 revision, by Pioneer Engineering
Hydrology Report for Pinnacle Crossing, 10/30/06 revision, by Pioneer Engineering
Preliminary Plat of Pinnacle Crossing, 1/13/06 revision, by Pioneer Engineering
Phase 1 Environmental Site Assessment, 2/4/04 revision, by Braun Intertec Corp.
Geotechnical Report for Pinnacle Crossing, 1/29/04 revision, by Braun Intertec Corp.
Wetland Delineation Report for Pinnacle Crossing, 11/6/03 revision, by Pioneer Engineering
Additional Information
Minnesota Rules, Chapter 4410 — EAW Requirement
City of Otsego Engineering Manual
City of Otsego Zoning and Subdivision Ordinances
National Wetland Inventory Map
PAGE 3
C:\Users\Tami.OTSEGO\AppData\Local\Microsoft\Windows\INetCache\Content.0utlook\1HD3FVW1\ot2334 RVW1.doc
PRELIMINARY PLANS
Cover Sheet (Sheet 1)
We recommend the Final Plat be named "Villas in Otsego".
2. Provide Developer contact information.
3. Streets shall be named as follows:
a. Street A= 71St Street NE
b. Street B = Quast Avenue NE
4. Provide an approval signature line for Ronald J. Wagner, City Engineer.
Existing Conditions (Sheet 2)
Existing zoning classifications for land in and abutting the subdivision.
6. Show buildings and label widths of existing streets, etc within 150'.
7. Location, size, and elevations of existing sewers, watermain, culverts, and other
underground facilities within 150'.
8. The normal and 100 year elevation for the wetland to the west shall be labeled.
9. Show the sei vices to the existing multi -family townhomes from off of 72nd Street.
10. Label existing street grades including Quenroe Avenue.
Preliminary Plat (Sheet 3)
11. The plat is proposed PUD single-family detached townhomes. The lot setbacks, widths,
lengths and sizes are subject to Council approval.
12. The existing private streets of Queens Court and 72nd Court as well as additional private
drives are proposed to serve the new lots. Queens Court is proposed to have the
bituminous surface completely removed with the proposed improvements. Written
permission from the current Home Owners Association responsible for these streets is
required.
13. 2 new entrances are proposed to access the public streets of 72nd Street and Quenroe
Avenue. Both entrances will require altering the existing curb and gutter and some
bituminous to make these connections.
14. The proposed Outlot B proposes to cover the private streets as well as much of the public
water, sanitary and storm sewer. This Outlot shall be covered with a drainage and utility
easement dedicated to the City.
PAGE 4
C:\Users\Tami.OTSEGO\AppData\Local\Microsoft\Windows\INetCache\Content.0utlook\1HD3FVW1\ot2334 RVW1.doc
15. Additional drainage and/or utility easements are needed beyond Outlot B to cover the
storm and sanitary sewer and wateimain. A minimum of 10' on each side of all pipe
shall be covered by easements. (Storm sewer in NE coiner of L8,132 and storm sewer
along south side of 72nd Court and west side of Quast Avenue).
16. The horizontal curves do not meet the minimum requirement required by the City of
Otsego. 90 degree intersection required a 90' radius or shall meet a 30 mph design
speed.
Removals (Sheet 4)
17. The removal of the curb and gutter at Quast Avenue is missing from the plans. A detail
or more information is necessary for how this new connection is to be made.
18. The hydrant at the intersection of 71" Street and Quenroe Ave will be in the way of the
new connection and shall be relocated.
19. The unused storm sewer stubs from the existing storm structures shall be removed or at
least plugged inside the manholes.
Preliminary Site And Utility Plan Sheet 5)
20. Depict the service locations for each lot.
21. Provide proposed rim and invert elevations as well as all pipe types and sizes for all
utilities.
22. See Comment #20.
23. Typically contractors will not want to tie into and pressure test against an existing valve
such as the one at 71" Street and Quenroe Ave. If the existing valve is to be used it
should be called to the contractors attention in the plans. 2 back to back valves will ne be
allowed. If a new valve is to be installed the existing valve shall be opened and the top 4'
of the valve box shall be removed.
Grading and Erosion Control Plan (Sheet 7)
24. Label the grades of the existing streets.
25. The normal and 100 year elevation for the wetland to the west shall be labeled.
26. Label the emergency overflow (EOF) elevations in the street gutter. The high point along
Quast Avenue appears to be and EOF and may require some of the garage floor
elevations to be raised. i.e. we calculate an EOF — 895.7. A minimum of 1.5' of
freeboard from this is required therefore Lots 1-4, Block 3 minimum garage floor
elevations shall be 897.2.
27. Label the high points in the rear yards of Lots 7-11, Block 3 as EOFs.
28. Final plans will require profiles for each street with vertical curve information.
PAGE 5
C:\Users\Tami.OTSEGO\AppData\Local\Microsoft\Windows\INetCache\Content.0utlook\1HD3FVW1\ot2334 RVW1.doc
SURFACE WATER MANAGMENT
29. The developers engineer has requested that the City accept a reduced infiltration volume
(0.5" over the new impervious area vs. 1.0" over the new impervious area). This is not
only a City requirement but the MPCA NPDES permit requirement as well and must be
met.
30. The maintenance of the infiltration basins shall be the responsibility of the Home Owners
Association. The maintenance of these basins shall be addresses in the development
agreement.
31. It shall be verified that all storm water calculations are using the ATLAS 14 rainfalls.
32. Inlet spread calculations shall be submitted. It appears that additional catch basins may
be needed along 71St Street. Streets are allowed to flood to 2/3 of the drive lane during a
10 yr storm.
WETLANDS
33. See comment #9 though no wetland impacts are proposed.
OTHER CONSIDERATIONS
34. Final plans will require a septate development plan and separate development tabulation
shall be provided. The development plans shall label proposed lot corner elevations, the
Lots and Blocks, Garage Floor Elevation, Lowest Floor Elevation, and Lowest Opening
Elevation.
35. Final street section is to be determined by a Geotechnical Engineer. The geotechnical
report shall be provided.
36. Many additional details will be required with the final plans, i.e. storm sewer catch basin
and manholes, hydrants, services, curb and gutter.
SUMMARY AND/OR RECOMMENDATION
We recommend approval contingent on the above comments being addressed.
PAGE 6
C:\Users\Tami.OTSEGO\AppData\Local\Microsoft\Windows\INetCache\Content.0utlook\1HD3FVW1\ot2334 RVW1.doc