The Town of Colma (Town) is seeking proposals from qualified consultants to provide consulting
services for environmental review and clearance, conceptual design, detailed design, permitting, and
design support during construction to install an off-channel full trash capture device system along the
Colma Creek. Requested consulting services include an evaluation of options for trash capture
devices, environmental review and permitting services (CEQA and NEPA), surveying as necessary
for design, hydraulic analysis of the impacts of installing the device(s), and structural analysis as
required for channel modifications necessary both to install the device(s) and maintain current channel
capacity. The trash capture device(s) will be installed within the City of South San Francisco near the
border with the Town of Colma. The trash capture system will be installed on easements belonging to
One Shoreline on private property, fully offline, positioned outside the current concrete channel, and
outside the BART ROW (Attachment A). The trash capture devices will treat flow from both tributaries
of Colma Creek in the project area as shown on Attachment A. Colma Creek is currently designed to
carry the 2% probability storm event (50-yr recurrence).
The Project is funded by Caltrans through a Cooperative Agreement with the Town of Colma. The
Town of Colma is the Sponsoring and Implementing Agency. The successful consultant will be
required to perform all work in accordance with the requirements of the Cooperative Agreement
(Attachment B) including compliance with all local, state, and federal requirements.
The Project entails developing and analyzing alternatives and implementing the preferred alternative
for an off-channel trash capture solution to comply with the San Francisco Regional Water Quality
Board's Municipal Regional Permit 3.0. The consultant will evaluate available trash capture device
solutions, perform hydraulic analysis to evaluate the impact of the trash capture devices on channel
capacity, evaluate the impacts of modifying the existing concrete channel to accommodate access to
the off-channel trash capture device while maintaining the current channel capacity, evaluate
constructability and maintenance requirements of the analyzed options, provide conceptual level
construction cost estimates of the recommended solution, complete environmental analysis and
permitting, and provide 30%, 60%, 95%, bid package engineering services, engineering support
during construction, and cost estimates. One Shoreline has developed a hydraulic model
(Paradigm/NHC 2021 model) for use by the selected consultant on this project. Hydraulic design
criteria for this project is included in Attachment C.
All firms must comply with the requirements of this Request for Proposals (RFP) and all instructions
enclosed herein.
The Town desires to complete the aforementioned work by the Spring of 2025 to allow construction
to begin in the Summer of 2025 subject to completion of environmental review and permitting. Questions and clarification inquiries about this RFP must be received by July 5, 2024 and should be
directed in writing or via email to: Jim Porter, Project Manager jimp@csgengr.com.
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