RFLP_3-25_SCOPE_OF_WORK.pdf

PROFESSIONAL SERVICES AGREEMENT

Project Name: Clear Creek Inline Stormwater Detention Facility (RLFP 3-25)

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Exhibit A – Scope of Work

Overview

Consultant services for the Cheyenne Clear Creek Inline Stormwater Detention Facility project are the development of a design that will evaluate and identify a feasible, constructible inline storage facility within the corporate limits of Cheyenne. Any innovative solutions that are cost effective and meet project goals will be incorporated during project scoping negotiations and included in the analyses/design. The work required for this project will include project management, field surveys, hydrologic/hydraulic analysis, storm drainage and detention design, geotechnical investigations, etc.

The project requires a professional design team that includes a Civil Engineer licensed in the State of

Wyoming with a minimum of 10 years of project design experience in one or more of the following areas of expertise: hydrologic/hydraulic analysis and the design of major stormwater projects; with the ability to provide in-house or capacity to sub-consult for survey and other services required for the project.

Project Description

The project is located along Clear Creek, directly upstream of the confluence of Crow and Clear creeks.

The Clear Creek Drainage Basin is approximately 24 square miles and extends southwest of Cheyenne to the confluence of the creeks at Ames Underpass just south of the Union Pafic Railroad tracks. Development downstream of the UPRR has significantly altered the historical alignments of Clear Creek and Crow Creek.

The historic channel within the corporate limits of Cheyenne has been filled and replaced with a small low-flow channel. The original confluence with Crow Creek was realigned in the 1930s and now exacerbates inundation and backwater issues through the Ames Avenue underpass. Within the Dave Romero Park, the floodplain is still intact and there is an expansive area on the south and east sides of the park, along the historic alignment of the channel, that can be used for significant storage and flood relief for the Ames

Avenue underpass. Storage at this location would assist in mitigating flooding in the downstream properties and backwater impacts at Ames Underpass.

The selected consultant will use an iterative approach with the hydrological and hydraulic modeling of project alternative designs, resulting in design alternatives to be evaluated. This approach will lead to a cost-effective project recommendation for the community. There will be multiple alternatives considered in the scoping/design effort including natural-based solutions such as expanded floodplain functionality for

Clear Creek, expanded and new wetlands within the drainage basin, and new detention/bio-retention features to enhance the overall functionality of the creek while providing much-needed flood control for our community. The existing connection to Crow Creek and impacts with the proposed detention area(s) will also be evaluated for larger storm events. This proposed project is intended to explore mitigation of flood events from Crow Creek that can be incorporated into the design to the extent practical. This approach will result in cost-effective and feasible mitigation measures that meet FEMA’s objectives of utilizing nature-based solutions and addressing both climate change and future conditions in the basin. Any additional value engineering recommendations that evolve during the scoping process will be given consideration by City staff.

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Project Tasks and Deliverables

At a minimum, the following tasks will be included in the analysis and design of the project:

1) Field Surveys and Reconnaissance for collection and evaluation of pertinent data needed for hydraulic modeling of design alternatives including conveyance pipes for a realignment of the Clear

Creek confluence with Crow Creek.

2) Identify existing utilities and adjust or relocate if necessary.

3) Digital topographic data development for use in hydraulic and geotechnical modeling efforts.

4) The development of a working hydraulic model to evaluate and design alternative storage areas and conveyance pipes using a reach specific model. The model will incorporate non-proprietary computer modelling such as the Environmental Protection Agency SWMM model, USACE HEC-

HMS, and/or the USACE’s HEC-RAS model into the design and provide review copies with the project deliverables. The consultant will supplement these models with a specific culvert analysis model as necessary. The underlying hydrologic input will initially be taken from the current effective regulatory hydrologic models. The consultant will provide recommendations for a corrected effective model, or a full replacement hydrological model for Clear Creek with the scope of the project.

5) Preparation of Cost Estimates/BCA Development per FEMA guidelines. The consultant will conduct BCA’s of each alternative hydraulic analysis and potential mitigation strategies to ensure the constructability and cost-effectiveness of the recommended strategy.

6) The evaluation and design of a detention storage facility (or multiple facilities working together) to provide flood relief for both the Ames Avenue underpass and downstream residential properties located in the historic flow path of Clear Creek that has been inundated with larger flood events.

7) Preparation of construction plans, special provisions to the standard specifications, and engineer’s estimates for construction cost for the preferred alternative.

8) Complete a FEMA CLOMR/LOMR for changes to the floodplain and FIRM. Finalization of the

LOMR can be completed after the FEMA period of performance ends.

9) Update the City/County floodplain mapping.

Project Funding and Timing

The city has $350k of funding available for the project. A portion of funds will be from a FEMA Building

Resilient Infrastructure and Communities (BRIC) grant and the remaining portion will be from the 1% optional sales tax (5th Penny).

The grant period of performance expires August 31, 2026.

General Conditions

The following items are included as part of the basic compensation for this project:

• Normal business expenses - phone, postage, etc.

• Cost of insurance.

• In-house computer time and service.

• Word processing, accounting, and man-hour records.

• Permits and license fees.

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• Mileage.

• Travel fees, room and board, per diem.

• Printing costs for all standard review, bidding, and as-constructed plans and other correspondence and contract documents.

• Film and processing.

Additional items which will be addressed:

All subconsultant fees at cost, which may include:

• Geotechnical Investigation.

• Surveying (boundary, topographic, utility).

• Utility investigation.

• FEMA Data Requests for Effective Models

• CLOMR and LOMR Application Fees (FEMA)

Other items:

• Overtime engineering and inspection.

• Special inspections, including vacuum excavation pot-holing.

• Survey materials, stakes, etc.

• Additional required services.

Any changes in the Consultant’s or Subconsultant’s staff or fee structure will be presented in writing to the

City for approval prior to initiating any changes or performing any work.