ITEM 2.1_Engineer ReportReview No. 1
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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
Mark Bezek, Elk River School District Superintendent
Gregory M. Hein, ISD #728 Executive Director of Business
Neil Tessier, P.E. SAFEngineering, PLLC
Josh Grenier, AIA, Wold Architects and Engineers
Reviewed by: Ronald J. Wagner, P.E.
Brent M. Larson, P.E.
Date: September 23, 2015
Proposed
Development: Otsego E-8 School
Street Location A portion of the SW'/4 of the SW'/4 of S19, T121, R23.
of Property: North of 80th Street NE and West of Marlowe Avenue NE
Applicant: Independent School District #728
815 Highway 10
Elk River, MN 55330
Developer: Independent School District #728
Owners of Record: Independent School District #728
Purpose: The Independent School District #728 School site is a proposed
approximate 20± acre site for an E-8 school with athletic facilities
within 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
TOPOGRAPHIC SURVEY/EXISTING CONDITIONS
FINAL PLAT
CONSTRUCTION PLANS
STORMWATER MANAGEMENT
OTHER CONSIDERATIONS
SUMMARY AND/OR RECOMMENDATION
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INFORMATION AVAILABLE
Construction Documents for Elk River ISD #728 E-8 School, dated 9/22/2015, by
SAFEngineering, PLLC and CEI Engineering Associates, Inc.
Wetland Delineation Report for Elk River ISD #728 E-8 School Site, dated 7/27/20 5, by
Kjolhaug Environmental Services Company, Inc
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
A preliminary plat is required. The following required information is missing from the
submitted construction documents;
a. Boundary lines of plat to include bearings, distances, curve data, and total acreage
of proposed plat, clearly indicated.
b. Existing zoning classifications for land in and abutting the subdivision.
c. Total area and setbacks of the proposed plat shall be listed.
d. Boundary lines of adjoining unsubdivided or subdivided land, identified by name
and ownership within 150'.
TOPOGRAPHIC SURVEY/EXISTING CONDITIONS
See Preliminary Plat comments.
FINAL PLAT
A Final Plat is required. It may be submitted and accepted simultaneously with the
preliminary plat
CONSTRUCTION AND GRADING PLANS
The full plan set was not reviewed in detail yet. The following are only the major comments for
the plans received 9/23/15 to initiate discussions developer and engineer.
Appears wetland in SE corner will be impacted by pond construction. Justification and
mitigation will be necessary for TEP approval. Approval is required prior to impacting
this wetland.
2. Connection and reconstruction of field catch basin along west property line is beyond
property limits. Written permission from adjacent property shall be obtained. The
existing structure and drain tile off of the School's property shall be covered by a
drainage and utility easement.
3. A small storm pond in the SW corner of the School property will be needed to facilitate
some runoff from 80th St reconstruct. The large pond in the SE corner of the School
property will need to facilitate some runoff from 80th St.
4. Some minor changes in contours will be needed to accommodate outlet pipe in SW
corner of site.
5. We recommend that the waterline on north side of building remain under the paved fire
lane.
6. We will incorporate our 80th St design with this drawing. Some ditching and culverts
shown on your plan will likely be alleviated on the north side as curb and gutter and
storm sewer will be installed.
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7. We suggest a water main stub on the east side of the building over to Marlowe for future
looping.
8. We suggest a trail along the west side of the parking lot so pedestrians can choose
between crossing the parking lot entrance or crossing after the parking lot with less
traffic.
9. To avoid needing to remove the lift station and forcemain from the school area and
replacing the forcemain with gravity in the future we suggest the temporary lift station be
located near future Maciver Avenue and that a gravity line be run from the school to the
lift station instead.
STORM SEWER MANAGEMENT
The site shall meet all City and NPDES Permit requirements. A stormwater management
report shall be submitted.
2. Storm sewer design calculations shall be submitted.
OTHER CONSIDERATIONS
Statement certifying the environmental condition of the site including the presence of any
hazardous substance as defined in Minnesota Statutes 11513.02, Subd 8
2. Soil borings and geotechnical data with a recommended R -value for pavement design
shall be provided.
SUMMARY AND/OR RECOMMENDATION
We recommend approval contingent upon the above comments being addressed.
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