ITEM 3.1_Eng ReportIHakanson
MIAnderson
ENGINEERING REVIEW
Residential Subdivision
for the City of Otsego
by
Hakanson Anderson
Review No. I
Submitted to:
Honorable Mayor and City Council
cc:
Adam Flaherty, City Administrator
Tami Loff, City Clerk
Dan Licht, City Planner
Andy MacArthur, City Attorney
Mike Suel, D.R. Horton, Inc.
Robert Olson, Westwood Professional Services, Inc.
Reviewed by:
Ronald J. Wagner, P.E.
Brent M. Larson, P.E.
Cody Sylvester, E.I.T.
Date:
November 15, 2017
Proposed
Development:
Emerson Pointe
Street Location
A portion of the NE 1/a of the SE 1/a Section 27, T121, R23.
Of Property:
West of Quaday Avenue NE and North of 72nd Street NE.
Applicant:
Mike Suel
Developer: D.R. Horton, Inc.
20860 Kenbridge Court, Suite 100
Lakeville, MN 55044
Owners of Record: D.R. Horton, Inc.
Purpose: Emerson Pointe is a proposed 50 single-family low density
residential lot development on approximately 20 acres 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 AVAILABLE
EXISTING CONDITIONS
SUBDIVISION CONFIGURATION, LOT SIZE, DENSITY
PRELIMINARY PLAT/STREET/TRAFFIC
PRELIMINARY GRADING, DRAINAGE, AND EROSION CONTROL PLAN
PRELIMINARY UTILITY PLAY
SURFACE WATER MANAGEMENT
WETLANDS
ENVIRONMENTAL
SUMMARY AND/OR RECOMMENDATION
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INFORMATION AVAILABLE
Preliminary Plans for Emerson Pointe, dated 10/24/17, by Westwood Professional Services, Inc.
Storm Water Management for Emerson Pointe, dated 10/23/17, by Westwood Professional
Services, Inc.
Wetland Determination Report, dated 9/19/17, by Westwood Professional Services, Inc.
Geotechnical Report for Emerson Pointe, dated 6/27/17, by Braun Intertec Corporation
Additional Information
Minnesota Rules, Chapter 4410 — EAW Requirement
City of Otsego Engineering Manual
City of Otsego Zoning and Subdivision Ordinances
National Wetland Inventory Map
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EXISTING CONDITIONS
Existing zoning classifications for land in and abutting the subdivision shall be shown on
the plan. (21-6-2.13.2.)
2. The limits of the Shoreland Overlay District shall be shown on the plan.
3. Label the size and elevations of existing storm sewer, water and sanitary or any other
underground facility within 150 feet of the proposed plat. (21-6-2.B.5.) See attached as -
built plans for utilities along Kadler Avenue.
4. Existing 100 -year flood elevations shall be shown on the plan. (21-6-2.B.9.)
SUBDIVISION CONFIGURATION, LOT SIZE, DENSITY
Emerson Pointe will be the first subdivision in this area of Quaday Avenue and does not
tie into any existing developments. The current configuration appears to provide
reasonable street and utility connection locations for developing future adjacent
properties. The developer shall continue work with City staff develop an acceptable
configuration.
6. R-5 zoning district requires a minimum lot width of 90' for corner lots (20-66-6.A).
Some corner lots do not meet this minimum.
PRELIMINARY PLAT/STREETS/TRAFFIC
Street shall be named according to the Wright County street naming system as follows;
a. Street 1
—Parson Avenue NE
b. Street 2
— Parson Court NE
c. Street 3
— 74th Street NE
d. Street 4
— Parrish Avenue NE
e. Street 5
— 74th Street NE
8. Provide horizontal curve information for all streets. Alll vertical and horizontal curves
shall meet 30 mph design speed requirements. Street 1 at Sta 13+50 does not meet this
requirement. (min K = 19 for crest and 37 for sag curves).
9. A temporary cul-de-sac will be required at the north end of Street 4.
10. Concrete valley gutters are required across all intersections with less than 1% cross slope.
11. Provide the Otsego Standard Plate 112 for a Local Residential Urban Street — 9 Ton.
Indicate which sections recommended R -value the streets are to be designed to.
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PRELIMINARY GRADING, DRAINAGE, AND EROSION CONTROL
PLAN
12. The grading plan and street profiles depict Street 4 ending approximately 12 feet below
the existing ground elevation. The profile shows this street continuing to the west at 2%
creating even more significant cuts. Provide verification that this street is a feasible
option for developing the adjacent property.
13. The grading plans show grading onto the property to the west. Written permission from
the adjacent property owner shall be provided to allow this.
14. 4' berm(s)s shall be provided in the rear yards along Quaday Avenue.
15. The rear yards of Lots 1-4, Block 3 flow into Quaday Avenue?
16. The proposed contours shall be labeled.
PRELIMINARY UTILITY PLAN
17. A connection to the existing watermain on the east side of Quaday Avenue at the
intersection of Quaday Avenue and Street 1 is required. This will need to be done by
directionally drilling under Quaday Avenue.
18. A watermain loop shall be provided between Lots 5 and 6, and Lots 20 and 21, Block 4.
19. A watermain stub shall be provided to the south property line along the west property line
of Lot 25, Block 4.
20. Hydrant coverage of 250' radius is necessary. Lot 4, Block 2 and Lots 14 and 15, Block 4
do not meet this requirement.
21. Ground water was encountered 7' below existing surface in geotechnical report. Final
plans shall note which, if any, hydrants will need to be plugged.
SURFACE WATER MANAGEMENT
22. It appears that the post -development offsite discharge rates are at or less than pre -
development per City requirements. It also appears that the site will meet the required
infiltration rates as required by the City and NPDES permit. The location of the
groundwater elevation may need further evaluation with respect to the infiltration area.
23. Storm sewer design and hydrology is still under review, any additional comments will
follow.
WETLANDS
24. The Wetland Determination Report, dated 9/19/17, has been received and under review.
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ENVIRONMENTAL
25. A statement certifying the environmental condition of the site including the presence of
any hazardous substance as defined in Minnesota Statutes 115B.02, Subd 8 is required.
SUMMARY AND/OR RECOMMENDATION
Contingent upon the above items being addressed we recommend revise and resubmit.
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