ITEM 2.2_attachmentReview No. 1
�Ha[canson
� )11Anderson
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
Rick Murray, Meridian Land Company
Paul Cherne, P.E., Pioneer Engineering
Reviewed by:
Ronald J. Wagner, P.E.
Brent M. Larson, P.E.
Date:
April 14, 2015
Proposed
Development:
Wildflower Meadows 4th Addition
Street Location
A portion of the NW 1/a of the SW 1/a of S26, T121, R23.
of Property:
SW of CSAH 42, east of Hwy 101 and north of CSAH 37.
Applicant:
Meridian Land Company
3600 American Blvd, Suite 750
Bloomington, MN 55431
Developer:
Meridian Land Company
Owners of Record: Meridian Land Holdings, LLC
Purpose: Wildflower Meadows 4th Addition is a proposed 2.55± acre, 9 lot
single-family residential development within the original 82± acres
of Wildflower Meadows development 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), and
(but not limited to) Minnesota Pollution Control Agency (sanitary sewer)
TABLE OF CONTENTS
INFORMATION AVAILABLE
PRELIMINARY PLAT, UTILTIY AND STREET CONSTRUCTION PLANS
COVER SHEET
EXISTING CONDITIONS
PRELIMINARY PLAT
SITE AND DEVELOPMENT PLAN
DEMOLITION AND GRADING PLAN
SANITARY SEWER AND WATERMAIN
OTSEGO STANDARD PLATES
GRADING DETAILS
FINAL PLAT
STORM SEWER MANAGMENT
OTHER CONSIDERATIONS
SUMMARY AND/OR RECOMMENDATION
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INFORMATION AVAILABLE
Final Plat for Wildflower Meadows 4th Addition, 3/5/15 submittal, by Pioneer Engineering
Preliminary Plat, Construction and Grading Plans for Wildflower Meadows 0 Addition, 3/5/15
revision, by Pioneer Engineering
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
Inlet Spread Calculations for Pinnacle Crossing, 1/17/06 revision, by Pioneer Engineering
Hydrology Report for Pinnacle Crossing, 10/30/06 revision, by Pioneer Engineering
Existing Conditions of Pinnacle Crossing, 1/13/06 revision, by Pioneer Engineering
Preliminary Plat of Pinnacle Crossing, 1/13/06 revision, by Pioneer Engineering
Preliminary Utility Plan for Pinnacle Crossing, 1/13/06 revision, by Pioneer Engineering
Preliminary Grading, Drainage & Erosion Control Plan for 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
City of Otsego Engineering Manual
Trunk Stormwater Facilities Study for Portions of Lefebvre Watershed, March 1999
City of Otsego Zoning and Subdivision Ordinances
National Wetland Inventory Map, 1991
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PRELIMINARY PLAT, UTILTIY AND STREET CONSTRUCTION
COVER SHEET
No comments
EXISTING CONDITIONS (SHEET 3)
Existing zoning classifications for land in and abutting the subdivision.
2. Show location, names, widths of existing streets, buildings, etc within 150' of boundary
3. Show location, size, and elevations of existing sewers, watermain, culverts, and other
underground facilities within 150'.
4. Boundary lines of adjoining unsubdivided or subdivided land, identified by name and
ownership within 150'.
Label 100 year flood elevations for pond to the NW and wetland to the SW.
PRELIMINARY PLAT (SHEET 4)
1. Show and label setback lines.
SITE AND DEVELOPMENT PLANS (SHEET 5)
A temporary cul-de-sac is required at the west end of 72nd Street. The temporary cul-de-
sac shall have a minimum radius of 40' and shall have bituminous curb. If the
development to the west, which is proposed to be developed soon, is final platted and
receives final approval the construction of the temporary cul-de-sac may not be required.
2. The bituminous street shall be saw cut and patched the full width of the street near the
manhole used to connect to the sanitary sewer.
Where curb and gutter is to be removed, the existing bituminous shall be milled 18" wide
x 1 %" deep along the entire length and patched.
DEMOLITION AND GRADING PLAN (SHEET 6)
The existing water and sewer lines stubs being abandoned shall be capped or plugged and
the gate valves shall be removed.
2. The storm sewer pipe being abandoned in front of Lot 1 shall be plugged. This shall be
called out in the plans.
The grading of the rear yards directs nearly all the runoff over the retaining wall at the
edge of the gas easement. There is some concern that this might cause erosion or even
failure of the retaining wall.
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SANITARY SEWER AND WATERMAEN (SHEET 7)
1. The angle of the proposed sanitary sewer connection to the existing manhole in front of
Lot 8, Block 1 is unacceptable as it will potentially hinder flow and cause built up of
debris at the bend in the manhole. This issue has been discussed with the developer's
engineer and they propose to reverse the flow of the lateral sewer line and connect at the
existing manhole in front of Lot 1, Block 1 instead.
2. Relocate or salvage the existing hydrant at the connection near the NE corner of Outlot
A.
The 90° bend between Lots 7 and 8 shall be made with two 45° bends.
4. The connection to the existing 4" water service stub needs a 6"x 4" reducer called out.
DETAILS (SHEETS 8-9)
1. The following Otsego Standard Plates do not apply to this job and should be removed;
308, 500, 707, 408, 409, & 308.
2. Otsego Standard Plate 704 (surmountable curb) is needed.
FINAL PLAT
1. A temporary cul-de-sac is required at the west end of 72nd Street. The cul-de-sac shall be
covered by an easement.
2. Outlot A is missing the drainage and utility easement coverage shown on the preliminary
plat and in the construction plans.
STORMWATER MANAGEMENT
1. The hydrology report and storm sewer design calculations submitted with the original
Wildflower Meadows submittal cover this area and were found acceptable.
2. The new NPDES permit requires that the water quality volume of 1" over the new
impervious area shall be infiltrated. At the time of construction of the first addition of
Wildflower Meadows City Ordinances were more strict and required that %2" of runoff be
infiltrated which was achieved. The remaining %2" volume must be infiltrated.
Per developer's engineer's response to this comment with Wildflower Meadows
3rd Addition, the project is covered by a previously permitted ongoing project.
Per the NPDES permit, for Previously Permitted Ongoing Projects "additional
permanent treatment required in this reissued permit (which requires the
additional infiltration) is not required for previously permitted projects". I am
unable to find an Active NDPES Permit for this site or any previous additions. If
documentation is provided to verify that this site is covered by a current open
NDPES permit the requirement of additional infiltration is not necessary.
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OTHER CONSIDERATIONS
New laws require all new developments to install locking cluster mailboxes or cluster
box units (CBU). The developer shall coordinate the location and model of CBU is with
the Postmaster.
SUMMARY AND/OR RECOMMENDATION
We recommend approval contingent upon the above comments being addressed.
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