HomeMy WebLinkAbout19- Task Order 1 - DOWL, LLC - Manley Ditch Rehabilitation Project so
o7,
♦rt'r,� yo��t?
EXHIBIT A TO PROFESSIONAL SERVICES AGREEMENT
TASK ORDER#1-MANLEY DITCH REHABILITATION PROJECT
Issued under the authority of Professional Services Agreement between the City of Bozeman (City) and
DOWL, LLC(Contractor)for a range of professional and technical services, including, but not necessarily limited
to, engineering design, preparation of construction documents, project bidding, and construction administration
services for various stormwater improvement projects, as requested by the City through the issuance of
individual and consecutively numbered Task Orders on an as-needed basis.
This Task Order is dated October 20 between the City and the Contractor.
1.0 PROJECT REPRESENTATIVES:
■ City: Kyle Mehrens,Stormwater Program Coordinator
■ Contractor: Wade Irion,Water Practice Lead
2.0 SCOPE OF WORK:
■ Attached Exhibit A-Scope of Services for the Manley Ditch Rehabilitation Project
3.0 COMPENSATION:
■ The City shall reimburse the Contractor on a Time& Materials basis not to exceed $42,021.
■ The Contractor shall invoice once monthly for services provided in the prior month.
4.0 WORK GOVERNANCE:
■ The provisions of the Professional Services Master Task Order Agreement and any Special Terms and
Conditions and Exhibits or Attachments to this Task Order shall govern the Work.
5.0 SIGNATURES:
IN WITNESS WHEREOF,the parties authorized to commit resources of the companies have executed this Task Order:
CITY OF BOZEMAN, MONTANA(CITY) DOWL, LLC(CONTRACTOR)
By:Andrea Surratt By:Wade Irion
Title:City Ma nag r Title:Water Pra tice
Le
Signature: Signature:
APPROVED AS TO FORM:
By:Greg Sullivan
Title:City Attorn \F7,
Signature:
Stormwater Design Professional Services Agreement Page 1
Task Order #1
Exhibit A - Scope of Services
Manley Ditch Rehabilitation Project
Introduction
Based on review of the Montana DNRC Water Resources Survey mapping, the Manley Ditch was also known as
the Slough Ditch and diverted out of Spring Creek immediately upstream of the Montana Rail Link tracks. This
ditch crosses the MRL tracks in a 43-inch steel pipe. Over the years, the ditch/Spring Creek upstream of the
crossing has been gradually converted to a stormwater conveyance.The outlet end of the MRL crossing pipe was
sealed off at some point in the past and accumulated stormwater now ponds in the area immediately upstream
from the railroad crossing pipe. The City of Bozeman (City) would like to remove the seal from the pipe crossing
and establish a stormwater outfall ditch to convey the stormwater to the Cherry River Fishing Access Site owned
by the State of Montana. The City would also like to incorporate sediment collection for water quality treatment
along the length of this new ditch.The approximate alignment of this ditch to avoid the corridor of utilities north
of the fence line is shown on Exhibit 1. This alignment follows MRL right of way and crosses MDT right of way
before reaching the State of Montana parcel. The alignment of the high-pressure gas line owned by Northwest
Energy will likely dictate the ditch alignment based on minimum horizontal clearance requirements.The proposed
alignment will impact a parking easement within the MRL right of way, immediately north of the MRL crossing
pipe. Given the significant topographic drop across the length of the ditch (4701.8 to roughly 4680), a series of
drop structures will likely be required for energy dissipation to prevent erosion and long-term maintenance issues.
The proposed ditch crosses what appears to be an irrigation lateral of the Farmers Canal just south of the fence
line,which may need to be perpetuated.It is assumed that a ditch access path will be incorporated into the design,
along the south side of the ditch alignment. This access path will also provide access for maintenance of the
adjacent sanitary sewer main. This scope of services describes the tasks to be completed by DOWL and the
deliverables that will be provided through project completion.
Scope of Services
Task 1. Design Survey
A supplemental design survey will be completed, building on the survey data collected through the feasibility
study. Services performed under this task will include completing topographic survey of the area of ponding
upstream of the MRL crossing, including the outlet of the two stormdrains discharging into this area and
verification of the invert elevation and top-of-silt elevation of the existing MRL pipe crossing. Utilities were located
and identified through the survey for the feasibility study. The elevation and size of these utilities, at the
anticipated location of the ditch crossings,will be surveyed as this may govern the design profile of the ditch. It is
Page 1
Task Order#1, Exhibit A—Scope of Services
Manley Ditch Rehabilitation Project
assumed that the City of Bozeman will provide the means for exposing these utilities to accommodate surveying.
DOWL will obtain the required occupancy permit from MRL to perform this work
Task 2. Hydraulic Analysis
A large drainage basin south of the MRL pipe crossing contributes runoff to this location. It is anticipated that a
future task order will address the hydrology of this contributing area as it relates to providing flood mitigation
measures to reduce flooding along the upstream ditch/drain system. For the purpose of the current Task Order,
the design capacity of the Manley ditch extension will be based on the hydraulic capacity of the existing MRL pipe
crossing. The maximum culvert capacity will be determined based on the typical maximum ponding level
upstream.
Task 3. Water Rights Research and Irrigation Company Coordination
DOWL will complete water rights research for the parcels in the vicinity of the old Manley Ditch to identify owners
of water rights to the historic Manley Ditch or Spring Creek downstream (north) of the railroad crossing. DOWL
will also contact the Farmers Canal company or others familiar with the irrigation service and water rights in this
area. Limited research of property deeds will also be performed as an additional means of identifying water right
holders to this ditch.The methodology and results of this research will be documented in a brief memorandum.
Task 4. Right of Way Coordination
DOWL will perform property research for the parcels crossed along the proposed ditch alignment, will provide
technical support to the City of Bozeman in coordinating the proposed project with MRL, MDT and Montana Fish,
Wildlife and Parks, and will provide exhibits for use by the City of Bozeman legal department in establishing the
required storm drainage easements across these parcels.The methodology and results of this research as well as
the easement exhibits will be documented in a brief memorandum.
Task 5. Final Design and Construction Drawings
Services performed under this task will include final design and development of construction drawings stamped
and sealed by an Engineer licensed in the State of Montana.A design memo documenting the basis of the design
will also be provided.
The survey base mapping and results of the hydraulic analysis will be used to design the ditch cross-section and
profile,the required location of drop structures and associated water quality treatment ponds,the crossing of the
foot path near the northwest end,and the configuration of the outfall channel into the Cherry River Fishing Access
site.This information as well as structure details and culvert extensions will be depicted in the construction plans.
It is anticipated that the profile of the pipe extension over the utility corridor, north of the MRL crossing will need
to provide for continued west-to-east service of the historic Farmers Canal lateral paralleling the fence line. The
anticipated ditch alignment will impact an existing gravel parking lot within the MRL right-of-way, behind
WealthVest Retirement Services. It is assumed that the square footage of this parking lot will be maintained
through reconfiguration of the gravel surfacing, as part of the project. DOWL will utilize available geotechnical
reports for the businesses adjacent to the ditch alignment as the basis of geotechnical recommendations for the
design of the ditch extension and drop structures. It is assumed that these geotechnical reports will be provided
by the City of Bozeman. It is assumed that obtaining MDEQ approval forthe Stormwater Pollution Prevention Plan
(SWPPP)for construction activities will be the responsibility of the construction contractor and that the municipal
Page 2
Task Order#1, Exhibit A—Scope of Services
Manley Ditch Rehabilitation Project
stormwater discharge permit for rehabilitation of the Manley Ditch outfall is covered under the existing City of
Bozeman MS4 permit.
Construction Drawing submittals will be made at the 35% concept level, 75% draft final design and final design.
Design review meetings will be conducted after the 35% and 75% submittals. Final construction drawings will
include a bid quantities sheet itemized with project materials,type, and quantity.
It is assumed that the City of Bozeman will assemble the construction specifications, manage bidding, award, and
contracting, as well as performing construction administration and inspection.
Schedule and Compensation
Survey will be completed in the fall of 2019, with final plans completed by the end of the year. It is anticipated
that the City of Bozeman will conduct bidding during the winter in anticipation of notice to proceed for
construction in the spring.This schedule is based on an assumed notice to proceed for TO#1 in October,2019.
Table 1 outlines DOWL's fee for the proposed Scope of Services. Given the variable nature of the services
potentially required, it is anticipated that this task order will be managed on a Time and Materials basis.
Table 1 - Compensation
Task Description Fee
1. Design Survey $ 3,861
2. Hydraulic Analysis $ 1,300
3.Water Rights Research and Irrigation Co. Coordination $ 5,770
4. Right of Way Coordination $ 9,240
5. Final Design and Construction Drawings $ 21,850
Total $ 42,021
Page 3
v�
✓✓/ \ /."�
F
VI ,
\
0
_ r ,
1 ANTICIPATED STOR ER \
DITCH ALIGNM/RN'•Y.' 40;
U
K
\ \ r a <
¢ F a
0 :z
zz < o g
ry as o
�2
uj
m M m O
W
S LL
U
PROJE CT{ 1.
DAIE O'R.1 OI'
� SCnIE 111 11ET