On-Call Collection System Hydraulic Modeling Services

Location:	California
Posted:	Jul 1, 2026
Due:	Jul 8, 2026
Agency:	Las Gallinas Valley Sanitary District
Type of Government:	State & Local
Category:	S - Utilities and Training Services
Publication URL:	To access bid details, please log in.

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July 1, 2026

To: Interested Parties

Re: Request for Qualifications (RFQ)

On-Call Collection System Hydraulic Modeling Services

Dear Prospective Consultants:

The Las Gallinas Valley Sanitary District (District) is seeking Statements of Qualifications (SOQs) from

qualified firms to provide on-call collection system hydraulic modeling services on a task basis using

the District’s existing hydraulic model. Under this multi-year agreement, the District will issue

individual task requests to model specific developments or scenarios within the collection system,

and the selected Consultant will perform each authorized task. The not-to-exceed amount payable

under the agreement is $100,000 per fiscal year, renewing each fiscal year over the term of the

agreement.

If you would like your firm to be considered, an electronic copy of your SOQ in PDF format must be

emailed to the attention of Jasmine Diaz at jdiaz@lgvsd.org cc: engineering@lgvsd.org with the

project name as subject heading, no later than 2:00 PM on July 8th. Award of a contract for this

RFQ is scheduled for July 16, 2026. Proposer shall call the District Engineering Department at 415-

472-1734 after submitting the SOQ to confirm receipt prior to the deadline.

Please contact Jasmine Diaz via email if you have any questions related to the contents and

requirements of the RFQ. Questions received after the inquiry deadline of July 6, 2026 may not be

addressed

Sincerely,

Jasmine Diaz, PE

District Engineer

101 Lucas Valley Road Suite 300 • San Rafael, CA 94903 • 415.472-1734 • Fax 415.499-7715 • www.lgvsd.org

RFQ - ON-CALL COLLECTION SYSTEM HYDRAULIC MODELING SERVICES

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LAS GALLINAS VALLEY SANITARY DISTRICT

RFQ – On-Call Collection System Hydraulic Modeling Services

REQUEST FOR QUALIFICATIONS

ON-CALL COLLECTION SYSTEM HYDRAULIC MODELING SERVICES

1. BACKGROUND

Las Gallinas Valley Sanitary District (District) is located in the Las Gallinas Valley of Marin County,

California between central San Rafael and Novato. It was established in April 1954 under the Sanitary

District Act of 1923 and provides wastewater collection, treatment, and recycling to more than

30,000 customers in the Santa Venetia, Terra Linda, San Rafael Meadows, Marinwood, Lucas Valley,

and other communities of San Rafael. The District’s jurisdiction spans approximately 50 square miles

from Hamilton Field to the north, San Pablo Bay to the east, central San Rafael to the south, and Marin

County Open Space Reserves to the west.

The District’s collection system includes 35 pump stations, 3,064 manholes, 3,121 gravity pipes, and

80 force mains. The District previously developed a comprehensive collection system hydraulic

model in InfoWorks to evaluate potential capacity issues associated with new discharges to the

collection system. The model and its supporting data are owned by the District and will be made

available to the selected Consultant.

The number of proposed developments within the service area has increased in recent years. The

District seeks an on-call consultant to apply the existing model to specific developments and

scenarios as the need arises, and to keep the model current.

2. OBJECTIVE

The objective of this RFQ is to retain a qualified on-call Consultant to perform collection system

hydraulic modeling services on a task basis using the District’s existing model. The Consultant will

not develop a new model. The District will provide the existing InfoWorks model, along with available

GIS, SCADA, and record drawing information, for the Consultant’s use.

Each task will typically involve modeling a specific development or scenario identified by the

District. At a minimum, the services shall enable the District to:

• Model a proposed development or operational scenario and evaluate its effect on the

collection system.

• Where a development or scenario exceeds system capacity, identify the infrastructure

improvements and develop cost estimates needed to accommodate it.

• Evaluate available capacity and identify capacity constrained segments and pump stations.

• Identify capital improvement needs and develop planning level cost estimates.

• Maintain the model as new record drawing, GIS, and SCADA information becomes available.

3. PROJECT CONSIDERATIONS

The Consultant shall provide qualifications with the following considerations in their SOQ:

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LAS GALLINAS VALLEY SANITARY DISTRICT

RFQ – On-Call Collection System Hydraulic Modeling Services

Existing Model and Software: The District’s model was developed in InfoWorks. InfoWorks

software will not be provided by the District; the Consultant shall maintain its own licensed

software compatible with the District’s model files.

Model Hosting: The District will provide the computer for hosting the hydraulic model. The

Consultant shall set up the model so that District staff can access available capacity information for

various sewer sections.

Data Sources: The District will provide access to record drawings, GIS, SCADA, and other available

data. SCADA data shall be coordinated with the District’s integrator, ArcSine. Where detailed

information is not available, rim elevations may be extrapolated from LiDAR data and inverts

estimated below grade, consistent with the assumptions used in the existing model.

Flow Assumptions: Where detailed flow information is not available, flows may be estimated using

400 gallons per capita per day, assuming 3.5 persons per Equivalent Dwelling Unit, consistent with

the existing model.

Coordination with Development Review: When the District reviews a proposed development, the

Consultant shall be prepared to model the development, identify any capacity impacts, and develop

a Technical Memorandum outlining the infrastructure and cost estimates for improvements needed

to accommodate it.

4. ON-CALL STRUCTURE, TERM, AND BUDGET

The District intends to award an on-call agreement under which hydraulic modeling services are

performed on a task basis. No work will be performed except as authorized by the District for a

specific task.

Term: The Agreement will have a multi-year term of three (3) years with an option to extend the

Agreement in accordance with Section 12 of the Agreement.

Budget: The not-to-exceed amount payable under the Agreement is $100,000 per fiscal year (July 1

through June 30, the District’s fiscal year). The annual not-to-exceed amount renews each fiscal

year over the term of the Agreement, and the cumulative fee for all tasks authorized within a fiscal

year shall not exceed this amount. Authorization of work in each fiscal year is subject to change

based on the District’s annual budget approval.

Task Authorization Process

Tasks will be authorized through the following process:

1. The District prepares a written task request describing the development or scenario to be

modeled and the desired outcome.

2. The Consultant prepares a letter proposal for the task, describing the scope, deliverables,

schedule, and a not-to-exceed fee based on the fee schedule in the Agreement.

3. The District and Consultant agree on the scope and budget for the task.

4. The District issues written authorization to proceed, consistent with Section 5 (Authorization

To Perform Services) of the standard Agreement.

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LAS GALLINAS VALLEY SANITARY DISTRICT

RFQ – On-Call Collection System Hydraulic Modeling Services

5. The Consultant performs the task and submits monthly invoices against the authorized task

amount.

6. The cumulative fee for all authorized tasks shall not exceed $100,000 in any fiscal year.

5. SCOPE OF SERVICES

The District will issue individual task requests over the term of the Agreement. The following

describes the representative services the Consultant may be asked to perform. The specific scope,

deliverables, schedule, and fee for each task will be defined in the Consultant’s letter proposal and

the District’s written authorization for that task. Each task proposal shall include the project

management, coordination, and quality control effort appropriate to the task.

A. Development and Scenario Modeling

• Model a specific proposed development or operational scenario using the existing model.

• Estimate and assign proposed flows and evaluate their effect on the collection system.

• Identify capacity constraints, surcharging, and affected pump stations resulting from the

scenario.

• Summarize results and recommendations in a letter report or technical memorandum.

B. Capacity Analysis

• Run the existing model for existing conditions and identify areas with surcharged conditions.

• Identify pump stations with potential pumping or wet well capacity issues.

• Correlate results with District observed issues and adjust model runs accordingly.

• Develop capital improvement recommendations with planning level costs.

C. Model Maintenance and Data Updates

• Update the existing model with new record drawing, GIS, SCADA, and LiDAR information.

• Maintain a record drawing tracking spreadsheet that can be sorted by watershed area, trunk

sewer, and pump station.

• Provide the updated model file to the District.

D. Infrastructure Improvements and Cost Estimating

• Where a proposed development or scenario exceeds the capacity of the existing system,

identify the infrastructure improvements needed to accommodate the additional flow, such as

pipe upsizing, pump station upgrades, or added storage.

• Develop planning level cost estimates for the identified improvements.

• Provide available capacity information for various sewer sections to support the District’s

development review.

General: All records (project reports, meeting notes, data files, project data, design calculations,

electronic files, and similar materials) generated under this engagement shall be the property of the

District and shall be turned over to the District upon completion or as directed.

6. STATEMENT OF QUALIFICATIONS REQUIREMENTS AND CONTENTS

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LAS GALLINAS VALLEY SANITARY DISTRICT

RFQ – On-Call Collection System Hydraulic Modeling Services

The SOQ shall be prepared in accordance with the following. Material submitted in addition to that

specifically required will not be reviewed.

Cover Letter

Include firm name, contact person, and a brief statement of interest why the firm is a good fit.

Firm Overview

Describe the firm’s history, size, officiation(s), and core areas of expertise.

Relevant Project Experience

Submit three (3) reference projects, each with the client name and contact information, scope, dollar

value, dates, and the firm’s role.

Key Personnel

Provide the organizational chart for the consultant team and identify proposed subconsultants, if any.

Resumes

Provide the resumes for key staff for the project.

Fee Schedule

Provide a fee schedule listing hourly billing rates by staff classification and a schedule of other direct

costs and any subconsultant markups. The fee schedule will serve as the basis for negotiating

individual task proposals. A total project fee is not required, since services will be authorized on a

task basis within the annual not-to-exceed amount.

Maximum Number of Pages

Ten (10) single-sided pages, including resumes and the list of sample projects. The fee schedule may

be on a separate 11 by 17-inch sheet. The cover page, cover letter, and fee schedule are exempt from

the page limit.

7. CONSULTANT SELECTION PROCESS

If deemed necessary, the District may invite up to three (3) firms for oral interviews. The criteria

used in evaluating SOQs include, but are not limited to, the following:

• Knowledge and understanding of the project requirements and District needs.

• Approach to performing services on an on-call, task basis.

• Experience with collection system hydraulic modeling, including InfoWorks.

• Responsiveness and ability to perform tasks within the schedules established in individual

task authorizations.

• Commitment of key personnel and their experience.

8. TENTATIVE CONSULTANT SELECTION SCHEDULE

• Request for Qualifications Published

• Questions on the RFP Deadline

July 1, 2026

July 6, 2026

RFQ - ON-CALL COLLECTION SYSTEM HYDRAULIC MODELING SERVICES

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This is the opportunity summary page. It provides an overview of this opportunity and a preview of the attached documentation.

Project Name	Job Number	Proposal Deadline
On-Call Collection System Hydraulic Modeling Services	TBD	7/8/2026, 2:00 PM

On-Call Collection System Hydraulic Modeling Services

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See also