ITEM 3.1_Eng ReportReview No. 1
Maid
Halcanson
111MIAnderson
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
Paul Tabone, Lennar Corporation
Francis Hagen Il, P.E. Westwood Professional Services, Inc.
Reviewed by:
Ronald J. Wagner, P.E.
Brent M. Larson, P.E.
Date:
July 14, 2016
Proposed
Development:
Martin Farms 4th Addition
Street Location
A portion of Section SE 1/a of Section 25, T121, R24.
Of Property:
North of 70th Street NE and West of Maciver Avenue NE
Applicant:
Paul Tabone
Developer:
Lennar Corporation
16305 36th Ave. N
Suite 600
Plymouth, MN 55446
Owners of Record:
Lennar Corporation
Purpose: Martin Farms 4th Addition is a proposed 99 lot single-family
residential development on 49.8 + acres within Outlot B of Martin
Farms 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
PRELIMINARY PLAT
SUBDIVISION CONFIGURATION, LOT SIZE, DENSITY
STREET/TRAFFIC/ACCESS
PRELIMINARY GRADNG AND EROSION CONTROL PLAN
PRELIMINARY UTILITY PLAN
STREET PROFILES
DETAILS
SURFACE WATER MANAGEMENT
WETLANDS
OTHER CONSIDERATIONS
SUMMARY AND/OR RECOMMENDATION
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INFORMATION AVAILABLE
Preliminary Plat Plans for Martin Farms 4th Addition, 6/1/16 revision, by Westwood Professional
Services, Inc.
Stormwater Management Calculations for Martin Farms West, dated June 20, 2016, by
Westwood Professional Services, Inc.
Geotechnical Report for Martin Farms West, dated 1/16/13, by Haugo Geotechnical Services
Geotechnical Report for Martin Farms, dated 1/8/03, by Northern Technologies, Inc.
Previous Plat Information
Preliminary Plat of Martin Farms, 6/16/03, by Westwood Professional Services, Inc.
As -built Construction Plans for Martin Farms, 12/16/09, by Westwood Professional Services,
Inc.
As -built Grading Plans for Martin Farms, 11/4/09, by Westwood Professional Services, Inc.
Final Storm Water Runoff Calculations for Martin Farms, dated 4/20/04 and revised 7/9/2004,
by Westwood Professional Services, Inc.
Geotechnical Report for Martin Farms, 1/8/03, by Northern Technologies, Inc.
Environmental Assessment Worksheet, June 2003, by Schoell & Madson, Inc.
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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PRELIMINARY PLANS
Cover Sheet (Sheet 1)
1. Provide benchmark(s) to be used for construction. All elevations shall be based on the
NGVD 1929 Adj Datum.
2. Provide an approval signature line for Ronald J. Wagner, City Engineer.
3. Plans shall be signed by the Engineer/Surveyor.
Existing_ Conditions (Plat Sheet 2)
4. The existing zoning classifications of the land abutting the subdivision are required.
The existing watermain running through the property is 16" diameter.
6. Label existing street widths.
7. Label NWL and 100 -yr HWL elevations for the existing ponds and wetlands.
The 12" CMP culvert under Maciver Avenue is no longer there and should be removed.
Preliminary Plat Sheet 3)
9. The plat is proposed PUD single-family detached townhomes. The lot setbacks, widths,
lengths and sizes are subject to Council approval.
10. 71 1/2 Street shall be 72nd Street NE. And Limmer Avenue shall be Laughing Street NE.
11. The street centerline information including horizontal curves shall be labeled. All
horizontal curves and tangents shall meet City of Otsego minimum lengths.
Preliminary Grading and Erosion Control Plan (Sheets 4)
12. A temporary cul-de-sac is required at the end of 73`d Street NE and Larabee Avenue NE.
13. Label an Emergency Overflow (EOF) between Lot 2 and 3, Block 5. The max. elevation
should be 950.7 to work with all proposed house elevations.
14. A minimum 1.5' of freeboard is required from the EOFs to the low openings. Lot 7 & 8,
Block 5 shall have a minimum lowest opening of 945.9, Lot 9, Block 4 shall be 951.1,
Lots 4 & 5, Block 2 shall be 947.0.
15. It is unclear if the area to the south of the "Limmer Avenue" intersection at Maciver
Avenue is intended to be a storm pond. No outlets are shown for this depression.
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Preliminary Utility Plan (Sheet 5)
16. The easements shown on the utility plan do not all agree with those shown on the
preliminary plan. Many storm sewer pipes do not have sufficient easement to cover the
proposed pipe. A minimum 20' easement centered on the pipe is required.
17. Drainntile with stubs for future sump connections will be required along the rear property
lines for all homes more than one lot width away from a storm structure. (i.e. rear yards of
Block 5).
18. Label the Block numbers on the utility plans.
Street Profiles (Sheet 6)
19. All vertical curves shall meet the minimum design standards for a 30 mph design speed,
i.e. minimum length of 90 feet or K -values of 37 for sag curves or 19 for crest curves.
Details (Sheet 8)
20. No comments
SURFACE WATER MANAGEMENT
21. Storm sewer design calculations and inlet spread calculations shall be submitted with final
plans.
22. The stormwater management calculations appear to meet all current City and NDPES
requirements for dead storage (including 2.5" NURP) and pre vs post discharge rates.
Hydraulic type "D" soils have been identified for this site therefore infiltration is not
required.
WETLANDS
23. Please submit the wetland delineation report.
OTHER CONSIDERATIONS
24. A septate development plan and separate development tabulation shall be provided. The
Lot, Block, Garage Floor Elevation, Lowest Floor Elevation, and Lowest Opening
Elevation shall be provided.
SUMMARY AND/OR RECOMMENDATION
We recommend approval contingent on the above comments being addressed.
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