ITEM 3.1_ Eng ReportReview No. 1
��Hal«nson
1��Anderson
ENGINEERING REVIEW
Residential Subdivision
for the City of Otsego
by
Hakanson Anderson
Submitted to: Honorable Mayor and City Council
cc: Adam Flaherty, City Administrator
Tami Loff, City Clerk
Dan Licht, City Planner
Andy MacArthur, City Attorney
Brian Krystofiak, P.E., Carlson McCain
Steve Bona, Capstone Homes, Inc.
Reviewed by: Ronald J. Wagner, P.E.
Brent M. Larson, P.E.
Cody Slyvester, E.I.T.
Date: November 28, 2017
Proposed
Development: Harvest Run
Street Location A portion of the S 1/2 of Section 35, T121, R23 East of Queens
of Property: Avenue NE and North of 59th Street NE.
Applicant: Steve Bona
Developer: Capstone Homes, Inc.
14015 Sunfish Lake Blvd., Suite 400
Ramsey, MN 55303
Owners of Record: LTH Three, LLC
Purpose: Harvest Run is a proposed 84 lot single-family residential lot
development on approximately 47.68 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
COVER SHEET
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 Harvest Run, dated 11/3/17, by Carlson McCain.
Storm Water Management Plan for Harvest Run, dated 11/3/17, by Carlson McCain.
Geotechnical Report for Harvest Run, dated 11/1/17, by Haugo Geotechnical Services.
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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COVER SHEET
A benchmark(s) and datum (should be NGVD 1929) shall be provided.
2. Ensure that all sheets have the correct scale (sheet 6 looks to be incorrect).
EXISTING CONDITIONS
3. Existing zoning classifications for land in and abutting the subdivision shall be shown on
the plan. (21-6-2.B.2.)
4. 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.)
5. Existing NWL and HWL 100 -year flood elevations shall be shown on the plan. (21-6-
2.B.9.)
6. Show the existing bituminous trail along the east side of Queens Avenue.
SUBDIVISION CONFIGURATION, LOT SIZE, DENSITY
7. Proposed zoning is not indicated but the proposed setbacks agree with a R-5 zoning
district.
PRELIMINARY PLAT/STREETS/TRAFFIC
8. Sheet 6 appears to have the wrong scale.
9. All existing Otsego projects have been constructed on NGVD 1929 datum and the as -
built plans also us this datum. Please convert to the 1929 datum.
10. Street shall be named according to the Wright County street naming system as follows;
a. Street A
— 62nd Street NE
b. Street B —
61St Street NE
c. Street C —
Quenroe Avenue NE
d. Street D
— 62nd Street NE
11. A tangent with minimum length of 100' is needed along Street A between the two curves.
12. Provide vertical curve information for all streets. All vertical and horizontal curves shall
meet 30 mph design speed requirements (min K = 19 for crest and 37 for sag curves).
13. All cross drainage between lots shall be covered by drainage and utility easements. The
grading shall be revised to direct the drainage along lot lines or additional easements will
be needed to cover the cross drainage.
14. A temporary cul-de-sac per Otsego Standard Plate 108a is required at the east end of
Street B.
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15. A profile with vertical curve information shall be provided for the proposed bituminous
trails.
16. At the time the sidewalks tie into the existing bituminous trail at Queens Avenue ADA
compliant pedestrian ramps shall be installed on the trail crossings at these locations.
PRELIMINARY UTILITY PLAN
17. Watermain loop between for Street A and Street C is required.
18. A temporary hydrant shall be installed at the east end of Street D and the north side of
Lot 13 and Lot 14, Block 7 for watermain flushing.
19. The locations of all existing and proposed watermain valves shall be shown. Also, please
include the locations of existing hydrants (near Queens Avenue).
20. The geotechnical report indicates there are some locations within the project area with
water table elevations relatively shallow. All hydrants and sanitary manholes within the
water table shall be identified in the plans. The hydrants within the water table are to be
marked with a metal strip, nozzle painted black, and their drain holes are to be plugged.
21. Provide storm sewer pipe sizes and inverts.
PRELIMINARY GRADING, DRAINAGE, AND EROSION CONTROL
PLAN
22. All cross drainage between lots shall be covered by drainage and utility easements. The
grading shall be revised to direct the drainage along lot lines or additional easements will
be needed to cover the cross drainage.
23. Include NWL and 100 -YR HWL elevations for all wetlands/ponds.
24. Often 2' contours do not provide enough detail for final lot grading, especially where there
are significant grade changes therefore the final grading plans shall provide an elevation
label at the front and rear setback lines on all lot lines between houses with 2' or more
elevation difference. These elevations shall provide fall away from the lower house.
(Similar to the elevation called out between Lots 122 and 123.)
25. Please label emergency overflows and elevations for the street low points (i.e. along lot
lines between houses, or in boulevard behind curbs).
26. Final plans shall include erosion control notes that indicate the contractor is responsible
for dust control, maintaining silt fence and other erosion control devices, and sweeping
streets daily if they are being disturbed.
27. A 50' vegetative buffer with one layer of silt fence or two layers of protection shall be
used around all existing wetlands. Also, the use of floating silt curtain should be
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necessary during the construction of the culvert between Wetland 30 and Wetland 40
depending on water elevations at the time of crossing.
28. Inlet protection shall be installed on all of the nearest catch basins located along Queens
Avenue downstream from the construction entrances.
DETAILS
29. Recommended R -value shall be shown in the typical section.
30. Please include all necessary City Details.
SURFACE WATER MANAGEMENT
31. The geotechnical report soil borings showed 3 borings hitting ground water but no ground
water monitoring was done. Due to the vicinity of the numerous adjacent wetlands
additional testing will be required to determine the groundwater elevations within the
development.
32. The Stormwater Plan states that infiltration is not feasible for the site due to the clay present
in the soil borings. The NPDES states that infiltration is not allowed for Hydrologic Group
D soils. Please refer to the D Type soils as the reason for not providing infiltration rather
than clay in the soil borings.
33. The report states that Type B, C and D type soils are being used in the model. If there are
no Type B or C soils present to provide infiltration then the model should use Type D soils
(at least no B soils).
34. The proposed pond P 100 discharging to wetland W 1 is a concern. Pond P 100 is receiving
water from an area that is currently discharging to wetlands W2 and W3 and by discharging
to WI is changing watershed areas. Please route P 100 to discharge to W2 or directly to
W3 to avoid increasing the watershed area of W1 and potentially causing downstream
issues with the increase volumes. (If this is not possible please contact Ronald Wagner or
Brent Larson to discuss).
35. A 10 -minute minimum Time of Concentration shall be used for the calculations.
36. The preliminary utility plans do not contain any storm sewer information to be reviewed
and compared to the design calculations.
37. A minimum of 2' of cover is required over to outside of the storm sewer pipe. Based on
the builds verify there will be sufficient cover over the pipe at structures 222, 208, and 207.
38. Final submittal will require inlet spread calculations for the following structures at
minimum; 103, 108, 210 and 305. The spread cannot exceed 2/3rds of the drive lane.
WETLANDS
39. A Wetland Determination Report is under review.
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40. The bituminous trails within the wetland buffer areas do not count towards the 20' average.
These buffer areas shall be adjusted to regain the average a 20' width.
41. The wetland buffer around each wetland needs to average 20'. It appears only a 10' buffer
is being provided around the wetland 60 (rear yards of Lots 133 and 134) in the grading
plans.
ENVIRONMENTAL
42. A statement certifying the environmental condition of the site including the presence of
any hazardous substance as defined in Minnesota Statutes I I5B.02, Subd 8 is required.
SUMMARY AND/OR RECOMMENDATION
We recommend approval contingent upon the above items being addressed.
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