HomeMy WebLinkAbout10-14-19 City Commission Packet Materials - C8. TO 1 and 2 to the PSMTO with DOWL for Stormwater Infrastructure Projects
Commission Memorandum
REPORT TO: Honorable Mayor and City Commission
FROM: Kyle Mehrens, Stormwater Program Coordinator
Mitch Reister, Director of Public Works
SUBJECT: Task Orders 1 and 2 under the authority of a previously executed Stormwater
Design Professional Services Master Task Order Agreement with DOWL, LLC
MEETING DATE: October 14, 2019
AGENDA ITEM TYPE: Consent
RECOMMENDATION: Authorize the City Manager to sign Task Orders 1 and 2 under the
authority of a previously executed Stormwater Design Professional Services Master Task Order
Agreement with DOWL, LLC.
BACKGROUND: In 2019, the Stormwater Division advertised a Request for Qualifications for on-call planning, engineering, and construction services. Staff: (1) selected DOWL, LLC
(Consultant), (2) negotiated a three-year Master Task Order Professional Services Agreement
(PSA) with the Consultant, and (3) delivered the PSA to the Commission for approval and City
Manager ratification on September 16, 2019. Staff utilizes the Consultant as projects arise, and funding is available. Attached are two Task Orders ready for the Commission’s consideration.
Task Order 1 contracts with the Consultant for the design of the City’s FY20 Manley Ditch
Rehabilitation Project. The ditch is part of a historic irrigation network, also functioning as a
stormwater conveyance. Multiple failures exist that cause flooding, including a blocked culvert
crossing and a degraded channel grade. Task Order 1 totals $42,021 and funds survey, modeling, water rights research, permitting, and design.
Task Order 2 contracts with the Consultant for the design of the City’s FY19 Downtown
Stormwater Treatment Project (also known as the Westridge Stormwater Treatment Project). The
project includes the installation of a Stormwater Treatment Unit near Overbrook and Westridge Drives, providing for increased compliance with the Montana Department of Environmental Quality’s regulations. Task Order 2 totals $21,980 and will fund survey, modeling, and design.
UNRESOLVED ISSUES: None
ALTERNATIVES: As suggested by the Commission.
FISCAL EFFECTS: The costs of Task Order 1 ($42,021) and Task Order 2 ($21,980) are commensurate with the proposed services. The City’s FY19 and FY20 budgets allocate $350,000 ($131,045 remaining) for the Downtown Stormwater Treatment and $100,000 for the Manley
Ditch Rehabilitation, respectively. The project totals include design and construction costs.
Attachments: Attachment A: Professional Services Master Task Order Agreement
Attachment B: Task Order 1 - Manley Ditch Rehabilitation Project Attachment C: Task Order 2 - Westridge Stormwater Treatment Project
Report compiled on: 10/3/2019
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Stormwater Design Professional Services Agreement Page | 1
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 Manager Title: Water Practice Lead
Signature: ___________________________ Signature: __________________________
APPROVED AS TO FORM:
By: Greg Sullivan
Title: City Attorney
Signature: ___________________________
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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
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Task Order #1, Exhibit A – Scope of Services
Manley Ditch Rehabilitation Project
Page 2
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 for the Stormwater Pollution Prevention Plan
(SWPPP) for construction activities will be the responsibility of the construction contractor and that the municipal
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Task Order #1, Exhibit A – Scope of Services
Manley Ditch Rehabilitation Project
Page 3
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
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ANTICIPATED STORMWATER
DITCH ALIGNMENT.WWW.DOWL.COMCITY OF BOZEMAN - MANLEY STORMWATER DITCHBOZEMAN, MONTANAPLANOVERALL SITEEXHIBIT 1
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•u-»^^7»s^ws's"S}y^.^CO.Oi"^<EXHIBIT A TO PROFESSIONAL SERVICES MASTER TASK ORDER AGREEMENTTASK ORDER #2 - WESTRIDGE STORMWATER TREATMENT PROJECTIssued under the authority of Professional Services Agreement between the City of Bozeman (City) andDOWL, LLC (Contractor) for a range of professional and technical services, including, but not necessarily limitedto, engineering design, preparation of construction documents, project bidding, and construction administrationservices for various stormwater improvement projects, as requested by the City through the issuance ofindividual and consecutively numbered Task Orders on an as-needed basis.20between the City and the Contractor.This Task Order is dated October1.0 PROJECT REPRESENTATIVES:City: Kyle Mehrens, Stormwater Program CoordinatorContractor: Wade Irion, Water Practice Lead2.0 SCOPE OF WORK:Attached Exhibit A - Scope of Services for the Westridge Stormwater Treatment Project3.0 COMPENSATION:The City shall reimburse the Contractor on a Lump Sum basis not to exceed $21,980.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 andConditions 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:WadelrionTitle: City Manager Title: Water Practice LeadSignature:APPROVED AS TO FORM:By: Greg SullivanTitle: City AttorneySignature:Signature:Stormwater Design Professional Services AgreementPage | 1134
Task Order #2Exhibit A - Scope of ServicesWestridge Stormwater Treatment ProjectIntroductionThe City of Bozeman (City) would like to add water quality treatment to the Westridge Drive storm drainimmediately upstream of the outfall near the intersection of Westridge Drive and Overbrook Drive (see Figure1). Installation of the treatment structure (assumed to be a Contech CDS unit) is planned to be in one of the twoalternate configurations/locations listed below. This scope of services describes the tasks to be completed byDOWL and the deliverables that will be provided upon project completion.Alternative 1: A junction manhole within the boulevard and in the approximate location of the firstmanhole upstream of the outfallAlternative 2: A combination inlet/junction manhole at the location of the first inlet south of thealternative 1 location.Scope of ServicesTask 1. Hydrology and HydraulicsDOWL will perform hydrologic modeling and hydraulic routing of precipitation events for the existing WestridgeDrive storm drain from the intersection of Westridge Drive and Arnold Street to the outfall near the intersectionofOverbrook Drive and Westridge Drive (see Figure 1). The total approximate contributing basin area isanticipated to be 5 to 10 acres.Hydrologic analyses will be based on precipitation hyetographs recently developed by DOWL for use on other Cityof Bozeman Stormwater Division projects. The source of this data is the 2017 revision of Appendix B, Table Bl ofthe MDT Hydrology manual for the Bozeman Airport precipitation gage. Hydraulic routing will be completed usingthe program Autodesk Storm and Sanitary Analysis (ASSA). The results of this modeling will be used to size a waterquality treatment structure for the Westridge Drive storm drain. We understand that the water quality event issomewhat flexible and is often driven by the size of the unit that is realistic given other project constraints. TheCity believes that a 5-ft diameter Contech CDS water quality structure may be the upper limit for treatmentstructure size at this location given site constraints. The ASSA modeling will provide estimates of peak flows forthe water quality storm as well as more severe precipitation events; these peak flows will be used to determinethe final structure size based on the Washington State Department of Ecology general use level designation forpretreatment of total suspended solids.The Westridge storm drain discharges to private stormwater ponds with an outfall to Figgens Creek in thenorthwest quadrant of the intersection of Westridge Drive and Overbrook Drive. Detailed analysis and designstorm routing through the ponds will not be completed; rather, a limited analysis of the ponds will be completedto estimate the pond water surface elevation for various precipitation events. This is anticipated to be anPage 1135
Task Order #2, Exhibit A - Scope of ServicesWestridge Stormwater Treatment Projectimportant factor in the design, as the water surface elevation in the ponds is the tailwater elevation for thetreatment unit and may control certain aspects of the design of the treatment structure.Task 2. Utility Locates and SurveySurvey base mapping will be developed for the project corridor. Services performed under this task will includerequestingutility locates, survey of utilities, and topographic survey of the project vicinity. DOWL will develop andsubmit a utility locate request and will survey the locations of utilities within the project corridor. Rim elevationsurvey and measure-downs to pipe inverts will be completed to document existing pipe elevations and sizes foruse in hydraulic analyses. The survey will be completed in NAD83 state plane coordinates and using the verticaldatum NAVD88. Survey within the private storm water ponds will be limited and may not completely characterizethe existing depth of the ponds. The pond outlet pipe elevations will be surveyed for use in hydraulic analyses.DOWL will notify the City of Bozeman in advance of the utility locates and survey to obtain permission to enterprivate property in the vicinity of the project.Task 3. Construction Documents and Design DocumentationServices performed under this task will include development of final construction drawings stamped and sealedby an Engineer licensed in the State of Montana and a design memo documenting the basis of the design.Once the size of the structure has been determined through hydrologic and hydraulic analysis, an alternativesanalysis will be completed to estimate the relative construction costs for Alternative 1 and Alternative 2 anddetermine the most cost-effective location for the treatment structure. Alternative 1 would include installation ofthe treatment structure at the existing junction manhole location; whereas, Alternative 2 would includeinstallation of a combination manhole at the location of the nearby inlet south of the Alternative 1 location. Thealternatives analysis (~15% design submittal) deliverable will consist of 1) a brief alternatives analysis summarymemorandum, 2) a plan view depicting the two alternatives and existing utilities mapped through the project, and3) the estimated construction cost of each alternative.The survey base mapping and results of the hydraulic analyses will be used to determine the final elevations forthe treatment unit. Pipe elevations at the location of the treatment structure will be based on the measure downsto existing pipe inverts. Given the recency of this storm drainage infrastructure and the existing size of the pipes,pipe stubs and dissimilar pipe couplings to accommodate potential future increases in pipe sizes are notanticipated. Modifications to the existing pipes will be depicted in the plans. It is assumed that the existing outfallpipe will be able to be modified and reused without impacting the adjacent stormwater pond. It is anticipatedthat construction may impact several panels of the adjacent sidewalk, the driveway to the west of the currentjunction manhole, curb and gutter in the vicinity of the existing inlet structure, and asphalt pavement. Details willbe provided in the plans for replacement or restoration of these features if they will be impacted duringconstruction.Given the proximity of the treatment structure to the private stormwater ponds and Figgens Creek, a portion ofthe manhole may be below the groundwater elevation. DOWL will evaluate buoyant forces and provide a factorof safety of at least 2.0 to resist floatation.Construction Drawing submittals will be made at 85% design and final design. A design review meeting will beconducted after the 85% submittal. Final construction drawings will include a bid quantities sheet itemized withproject materials, type, and quantity.Page 2136
Task Order #2, Exhibit A - Scope of ServicesWestridge Stormwater Treatment ProjectTask 4. Floodplain PermittingThe project is within the mapped extents (Zone AE) of the base flood as shown on FEMA map number30031C0818D; therefore, a floodplain development permit will be required for construction. DOWL will preparethe permit using the Montana Joint Application. The Westridge Stormwater Treatment Project will includerestoration of ground surface (e.g., boulevard, pavement, sidewalks, curb and gutter) in the vicinity of thetreatment manhole to the pre-project conditions and will therefore have no adverse impact on the floodplain.The project and any impacts will be described qualitatively, and it is assumed that a hydraulic model will not benecessary for development of the permit.Task 5. Plant Species ListDOWL will provide a species list of native plants that could be planted within and around the private storm waterponds downstream of the outfall. The species list will be customized with plants appropriate for the area ofBozeman, MT and will include what the planting conditions should be for each species (e.g., below the ordinaryhigh-water mark but in water less than 3 feet, within 12-inches above the ordinary high water, greater than 12inches above the ordinary high water). Guidelines on appropriate plant material sizes, timing of planting, and plantprotection will also be provided. DOWL will coordinate with the City of Bozeman in establishing the objectives ofthe plantings (i.e. herbaceous or woody plant types or both, any aesthetic objectives, planned approach tomanagement or maintenance of the ponds, etc.). The species list will be provided in the format of a technicalmemorandum that could be handed off from the City of Bozeman to the home owner's association.Schedule and CompensationSurvey will be completed in the fall of 2019. Final plans will be completed during the winter of 2019 to facilitatebidding for spring 2020 construction. This is based on notice to proceed in October, 2019. Table 1 outlines DOWL'sfee for the services included.Table 1 CompensationTask DescriptionEstimatedFeeTask 1. hlydrology and hlydraulicsTask 2. Utility Locates and Survey$ 7,560.00$ 3,600.00Task 3. Construction Documents and Design Documentation | $ 9,245.00Task 4. Plant Species List$ 1,575.00Totall $21,980.00Page 3137
Task Order #2, Exhibit A - Scope of ServicesWestridge Stormwater Treatment ProjectFigure 1 Map of Existing Westridge Drive Storm Drainage Facilities1SS£^ -ti^^lit;. »! ,)*TJ^/,»t»,^:^^R»^^/.K/^sovr•I*»1:^!•«?ft-•••.?^I«^.'?s<s';t"''Ifv»1C^4.&cr'^4/<*^>]»IV^r* -•9?»»,.vs^<r~*\<v4sf^K^^^tf-»r+--;y.*•»<^•a>3^s'^<^^1!^^/^^\...»1»':^ -w»s^( ^^^3^¥^1»r^*T»t.?.^•V^a&w1^ION..»••••»^t«:<.:-<^"^^' ^^^^5~!r.^.f\^ ^1^1^^^^"s *'eayv••^€^.^^'^•^-^•a<JI^rt^!fi^•1<^^,«at-ae^ne.»y*"<»0ISO300ft•R<<dKPlanned TreatmentStructure Location?s0<».v^015i0(t'.;T Lsca'—nentPage 4138