Item 3.13 Engineering Manual Revisions
Request for
City Council Action
DEPARTMENT INFORMATION
ORIGINATING DEPARTMENT REQUESTOR: MEETING DATE:
Public Works City Engineer Wagner February 24, 2025
PRESENTER(s) REVIEWED BY: ITEM #:
Consent City Administrator/Finance Director Flaherty 3.13 – Engineering Manual
STRATEGIC VISION
MEETS: THE CITY OF OTSEGO:
Is a strong organization that is committed to leading the community through innovative communication.
X Has proactively expanded infrastructure to responsibly provide core services.
Is committed to delivery of quality emergency service responsive to community needs and expectations in a
cost-effective manner.
Is a social community with diverse housing, service options, and employment opportunities.
Is a distinctive, connected community known for its beauty and natural surroundings.
AGENDA ITEM DETAILS
RECOMMENDATION:
City staff recommends the City Council approve updates to the City of Otsego Engineering Manual.
ARE YOU SEEKING APPROVAL OF A CONTRACT? IS A PUBLIC HEARING REQUIRED?
No No
BACKGROUND/JUSTIFICATION:
The City Engineering Manual is updated every few years to update best management practices or incorporate new
procedures and technology. Hakanson Anderson has met with the City’s Public Works and Utilities Department
staff as well as consulted with various industry professionals to determine recommended changes.
Summary of Changes to Engineering Manual
Modified Language
• Require Contractor presence to complete acceptance walk-throughs
• Specify approved connection apparatus between different pipe materials
• Delete allowance of concrete rings in rehabilitation of manholes and allow only HDPE rings that match the City’s
current requirements
Modified Standard Plates for clarity or to update specifications
• Plate 200 – Water Service Detail (Curb Stop)
• Plate 201 – Water Service Detail (Valve)
• Plate 300 – Sanitary Sewer Standard Manhole
• Plate 305 – Standard Monolithic Drop Manhole
• Plate 309 – Manhole Adjusting Rings
SUPPORTING DOCUMENTS ATTACHED:
• Proposed Revisions
POSSIBLE MOTION
PLEASE WORD MOTION AS YOU WOULD LIKE IT TO APPEAR IN THE MINUTES:
Motion to accept the revisions as proposed to the City of Otsego Engineering Manual.
BUDGET INFORMATION
FUNDING: BUDGETED:
N/A
N/A
CITY OF OTSEGO
ENGINEERING MANUAL
March 1999
REVISIONS:
Revised 3/31/99 per workshop
Revised 8/25/99 – Addition of Standard Plates 405 and 406
Revised 2/27/01
Revised 5/12/03
Revised 4/6/05
Revised 5/10/07
Revised 2/23/09
Revised 3/19/13
Revised 8/18/15
Revised 3/19/18
Revised 1/1/2023
Revised 8/15/2023 – Replace the existing city property sign Standard Plate with the new Standard Plate
Revised 2/14/2025
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4. The developer will be responsible for not only plans and specifications
preparation, but also for providing staking. All cut sheets shall be provided
to the City Engineer or his representative within 24 hours. Resident
inspection of said improvements to assure compliance with the approved
plans shall be completed by the City.
5. Copies of all bids, change orders, etc. relating to the improvements shall be
forwarded to the City Engineer.
6. The developer shall furnish to the City the list of selected contractors and
subcontractors being considered for retention by the developer for any of
the public improvements work in the development. The City has the right
to reject any contractor or subcontractor deemed unacceptable to the City.
7. Any changes to the approved plans and specifications shall be approved by
the City Engineer in writing before work is started. If the change affects the
project letter of credit by increasing the cost, the letter of credit shall be
increased before the work can begin.
8. The developer will hold a preconstruction meeting at the City Public Works
Department Facility prior to start of any work on the development. The City
staff and City Engineer along with the contractor and subcontractors,
developer’s engineer, utility companies and other interested parties must
be invited to the meeting. The developer will be responsible for drafting pre-
construction meeting minutes. The said minutes shall be submitted to the
City Engineer for review, then distributed by the developer to all parties
whom were in attendance at the meeting.
9. The developer shall retain an independent testing service to perform the
required tests of materials. Copies of tests will be directed to the City
Engineer. The cost of this service will be the responsibility of the developer.
The City shall be notified 24 hours in advance of all scheduled tests so its
representatives can be present at the time tests are made. The required
tests include sanitary sewer, watermain, storm sewer, street subgrade,
sidewalk and bike path subgrade, base course, wear course, and curb and
gutter.
10. Initial City Acceptance:
Upon completion of all the work required, the developer must schedule a
walk-thru. The developer, the contractor, the City street maintenance
department, City utility department, and the City Engineer or their
representative shall be invited. The contractor is required to attend and shall
be ready to help inspect site. Written Initial City Acceptance of the
completed work shall be made by the City Engineer, subject to the following:
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previously accepted the work. The developer shall give prompt notice after
discovery of any unacceptable conditions to the contractor responsible for
the project work.
Unless otherwise noted in the contract documents, the following
requirements shall apply:
a. The developer shall guarantee all work relating to utilities,
appurtenances, material and equipment furnished by him for a period
of one year from the date of initial written City Acceptance of the work
or project. The utilities will not be accepted prior to placement of the
wearing course being constructed.
b. The developer shall guarantee all work relating to street construction
including concrete curb and gutter, materials and equipment
furnished by him for a period of two years from the date of written
acceptance of the work or project, unless the wearing course is
placed during the same construction season as the base course. In
those instances, the contractor shall guarantee all work including
street construction, concrete curb and gutter, material and
equipment furnished by him for a period of three years from the date
of written acceptance of the work or project. The streets will not be
accepted prior to the wearing course being constructed.
c. The developer shall provide a warranty letter of credit. The amount
of the letter of credit will be determined by the City engineer based
on the cost of imported manufactured materials delivered to the
project.
14. Final City Acceptance:
No more than 30 days prior to the conclusion of the warranty period and
before the improvements may be finally accepted by the City, the developer
must schedule a walk-thru. The developer, his contractor, the City Street
maintenance department, City utility department, and the City Engineer or
his representative shall be invited. The contractor is required to attend and
shall be ready to help inspect site. Upon Final Acceptance by the City and
conclusion of the warranty period, the City will assume responsibility for the
public improvements. All inspection costs are the responsibility of the
Developer
15. After all public improvements have been completed, properly inspected as
specified above, and an acceptable maintenance guarantee provided, the
project will be accepted by the City and the Warranty Letter of Credit may
be released.
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ii. Irrigation lines of 2” or less shall be wet tapped. Saddles shall be
used for all connections to 6” diameter or smaller watermains.
iii. Irrigation lines larger than 2” shall connect to the watermain by
cutting in a minimum 4” diameter Tee and a Gate valve. If the
required irrigation service is smaller than 4” diameter a corporation
of the required size shall be wet tapped into this pipe or into a cap at
the end of the pipe.
iv. Irrigation service shall be equipped with a ¼ turn ball valve, metering
equipment, and a RPZ backflow preventer, Water meter shall be
obtained at City Hall with payment of established fee and installed in
accordance with directions.
v. Above ground equipment shall be completely enclosed by a metal or
other approved structure and shall be level and mounted a concrete
pad.
vi. All irrigation services shall have a rain or moisture sensor.
l. Alpha Restrained Joint or approved equal shall be used to connect
DIP to HDPE
6. Street Material:
All materials shall be in conformance with latest Edition of the Minnesota
Department of Transportation Standard Specifications for Construction, or
as modified herein in and Appendix D.
7. Tracer Wire:
a. Tracer Wire (direct bury), when required, shall be two minimum #12
AWG Copper Clad Steel wire or minimum #12 AWG solid Copper
wire wit minimum 450 lb. break load, with 30 mil high molecular
weight polyethylene insulation.
b. Tracer Wire (directional boring), when required, shall be (3) three #12
or #10 AWG Copper Clad Steel wires, with minimum 1,150 lb. break
load, with 30 mil high molecular weight polyethylene insulation.
c. Wire connectors (direct bury), shall include 3-way lockable
connectors and mainline to lateral lug connectors specifically
manufactured for use in underground trace wire installations.
Connectors shall be dielectric silicon filled to seal out moisture and
Deleted: ¶
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b. During street construction, measures shall be taken to prevent sand,
class 5 and other materials from entering manholes.
c. All sanitary sewer spills shall be handled in accordance with the
City’s Standard Operating Procedure as prepared by Hakanson
Anderson Associates, dated March 2007, and the City’s Spill
Response Plan as prepared by Hakanson Anderson Associates,
dated May 2007.
2. Storm Sewer:
Pipe sewers shall be installed in accordance with CEAM 2621 and MnDOT
2501, except as modified herein (See Appendix C.5.g for additional storm
sewer requirements).
3. Casting Adjustments:
All utility castings shall be adjusted as follows:
a. Sewer Manhole:
All sanitary and storm sewer manhole castings shall be in place
during the laying of the wear course. The castings shall be adjusted
before the mat is laid and shall be not less than one-quarter inch
(1/4”) or more than three-eighths inch (3/8”) below finished grade.
Cast iron adjustment rings will be allowed to make the final
adjustment prior to wear course paving. Paving must be completed
within 48 hours of making the adjustment. Castings must be
protected during the placement of the bituminous course(s) so that
the casting covers do not have contact with the bituminous material.
b. Storm Sewer:
Storm sewer inlet castings shall be adjusted to be 2” inches below
finished gutter line.
c. Water Valve Boxes:
All water valve boxes shall be adjusted prior to wear course paving
to one-half inch (1/2”) below finished grade. Only screw-type
adjustments are allowed. All valve boxes must be constructed such
that they are true and plumb. All valve boxes will be tested for
plumbness using a section of 4” PVC pipe.
d. Adjusting Rings:
Deleted: Grouting
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Adjusting rings shall be High Density Polyethylene. Top ring shall be
tapered to match slope of street or ground. Number of rings shall be
minimized by using 4” rings where possible. Total ring height shall
be a minimum of 4” but not more than 16”.
4. Streets:
Street construction work and materials shall be in accordance with the latest
edition of the Minnesota Department of Transportation Standard
Specifications for Construction, or except as herein modified:
Common excavation and embankment – Mn/DOT 2105
Common excavation and embankment density or compaction
requirements. Roadway embankment shall be compacted by the method
described as “Specified Density” as outlined in Mn/DOT Section 2105.3
Paragraph F1.
Aggregate Base Mn/DOT 2211 with compaction by the specified density
method.
Plant mixed bituminous non-wear – Mn/DOT 2360.
Tack coat shall conform to Mn/DOT 2357
Plant mixed bituminous wear – Mn/DOT 2360.
Concrete curbing Mn/DOT 2531 using B618 or Otsego Standard Plate 704.
Concrete curing and protection – Mn/DOT 2531.3G
Street(s) shall be constructed in accordance with typical sections shown on
City Standard Plates and detailed in Appendix D.
The final wear course shall not be constructed until at least one construction
season after the base construction is completed and shall be delayed one
more construction season if at least 75% build out is not achieved.
However, the final wear course shall not be delayed for a period longer than
two years after the base course is paved, regardless of build out; in which
case, the developer shall provide an escrow for fog sealing the streets in
the event the final wear course is placed prior to 75% build out.
Before excess common excavation, borrow or other materials from projects
are deposited or mined on private property, a grading, fill or mining permit
is required by the City, plus permission in writing from the property owner.
Deleted: Whenever concrete adjustment rings are
provided, the contractor shall grout rings, place the
castings and remove all excess grout on the inside
and outside of the manhole by wiping smooth with a
gloved hand or similar instrumen