Request for Proposals for Engineering Design Services for Chlorine Conversion Project - Gaseous Chlorine Feed System to Liquid Hyprochlorite Feed System

CITY OF CALEXICO
Request for Proposals
for
Engineering Design Services for Chlorine
Conversion Project - Gaseous Chlorine
Feed System to Liquid Hypochlorite Feed
System
Public Works Department
549 Pierce Avenue
Calexico, CA 92231
760/768-2160
www.calexico.ca.gov
April 07, 2026

TABLE OF CONTENTS
SECTION DESCRIPTION PAGE
I Introduction and Background 3
II Project Posting and Scheduling 3
III Scope of Work 4
IV Notification of Consultant Registration 4
Requirements (Where Required)
V Submittal Requirements 5
VI Selection Process 8
VII Tentative Schedule 8
VIII Inquiries 8
IX Submittal Deadline 8
EXHIBITS
A - Sample Proposal Evaluation Form
B - Sample Consultant Agreement and Insurance Requirements
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I. INTRODUCTION AND BACKGROUND
The City of Calexico ("City") is requesting proposals from qualified engineering professionals to
provide engineering design services for Chlorine Conversion Project - Gaseous Chlorine Feed
System to Liquid Hypochlorite Feed System. The City proposes to convert from a gaseous chlorine
system to a 12.5% bulk sodium hypochlorite disinfection system.
The City owns and operates a Water Treatment Plant ("WTP") and Eastside Water Reservoir
("EWR"). The WTP receives its water supply from the Colorado River through the Imperial
Irrigation District's ("IID") canal. The City's WTP has a design capacity of 14 Million Gallons
per Day ("MGD"), with an average daily demand of 7-8 MGD and current peak flow of 9 MGD.
The EWR has a design capacity of 6 MGD, with an average daily demand of 1.25 MGD. Both the
WTP and EWR currently operate on gaseous chlorine water disinfection system to disinfect the
water prior to distributing it through the City's supply lines. The City has concerns regarding the
usage of chlorine gas as a disinfectant, as chlorine gas is toxic and poses dangers to the public and
operations staff. The WTP is located adjacent to residential and commercial areas, schools and the
Calexico International Border and the EWR is located adjacent to residential area. Both facilities
pose a significant high risk of chlorine gas exposure to the public.
The contract will be regulated according to the provisions of all federal, state and local laws and
ordinances that are applicable. This includes compliance with prevailing wage rates and their
payment in accordance with California Labor Code, Section 1774. All Service Providers and sub-
consultant(s) shall pay all workers not less than the general prevailing rate of per diem wages and
the general prevailing rate for holiday and overtime work as determined by the Director of the
Department of Industrial Relations, State of California, for the type of work performed and the
locality in which the work is to be performed, pursuant to sections 1770 et seq. of the California
Labor Code. Prevailing wage rates are available on the Internet at: http://www.dir.ca.gov. All
Service Providers and sub-consultant(s) shall comply with the registration and qualification
requirements pursuant to sections 1725.5 and 1771.1 of the California Labor Code.
II. PROJECT POSTING AND SCHEDULING
This RFP is being distributed over the internet and is posted at the City's website at the following
address: https://www.calexico.ca.gov/bidsandrfps. Consultants wishing to propose in response to
this RFP must obtain this document from our website. Due to the fact that anyone can download
the RFP and the City has no method for tracking the distribution, the City is not able to maintain
a list of potential consultants and/or proposers and cannot provide individual notification of
amendments or addendums to this RFP.
The City will therefore post any addendums to the RFP on the above mentioned website. All
consultants shall refer to the website to verify all addendums that have been issued and that they
have acknowledged all such addendums in their proposal.
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III. SCOPE OF WORK
The scope of work includes but is not limited to:
Task No. 1 - Project Management, QA/QC, and Accounting
Task No. 2 - Project Setup, Site Visit and Preliminary Design Meeting
Task No. 3 - Draft Feasibility/ Preliminary Design Report and Final Feasibility Study/Preliminary
Design Report for Water Treatment Plant and Eastside Water Reservoir
Task No. 4 - Plans, Specifications and Estimate for Water Treatment Plant and Eastside Water
Reservoir
a. 50% design submittal
b. 90% design submittal
c. 100% design submittal
Task No. 5 - Final Plans, Specifications and Estimate for Water Treatment Plant and Eastside
Water Reservoir
Task No. 6 - Regulatory Agencies, Environmental and Permitting
a. CEQA, NPDES Construction Permit
b. State Water Resources Control Board, Division of Drinking Water
a. Monthly/Quarterly updates
c. Department of Toxic Substance Control
d. Imperial County Air Pollution Control District
e. City of Calexico Development Services Department
f. City of Calexico Fire Department
g. Other
Task No. 7 - Public Meetings, Outreach, and/or Presentations to City Council
a. Preparation of agendas, minutes, agenda staff reports, etc.
b. Approximately five (5) meetings
Task No. 8 - Additional Field Survey
Task No. 9 - Bidding Support and Construction Phase Services
a. Addendum for design related issues
b. Pre-bid meeting agenda and minutes
c. RFI responses and submittal review comments
d. Assist in change orders during construction
e. As-built record drawings
Task No. 10 - City of Calexico Water Treatment Plant and Eastside Water Reservoir Operation
Manual Plan Update
IV. NOTIFICATION OF CONSULTANT REGISTRATION REQUIREMENTS
(WHERE REQUIRED)
Pursuant to the requirements of California Labor Code section 1771.1, all consultants and sub-
consultants that wish to engage in public work through a public works contract must be registered
with the Department of Industrial Relations (DIR).
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Beginning March 1, 2015, no consultant or sub-consultant may be listed on a bid proposal for a
public works project unless registered with DIR.
Beginning April 1, 2015, no consultant or sub-consultant may be awarded a contract for public
work on a public works project unless registered with the DIR, pursuant to Labor Code section
1725.5
All consultants, including sub-consultants listed in the proposal must be registered with the DIR
at the time proposals are due, and must submit proof of registration with the proposal. Any
proposals received listing unregistered consultants and/or sub-consultants will be deemed non-
responsive.
NOTE: DIR number is to be specified on the cover page of the consultant proposal. Proof of
registration for consultant and sub-consultant shall also be submitted as an exhibit of the
proposal.
Application and renewal are completed online with a non-refundable fee of $400. Read the Public
Works Reforms (SB 854) Fact Sheet for requirements. Instructions for completing the form and
additional information can be found on the DIR website.
This Project is subject to compliance monitoring and enforcement by the Department of Industrial
Relations.
SOURCES OF INFORMATION
INFORMATION WEBSITE
Department of Industrial Relations (Public http://www.dir.ca.gov/Public-
Works) Works/PublicWorks.html
SB 854 Fact Sheet https://www.dir.ca.gov/Public-
Works/PublicWorksSB854.html
Senate Bill 854 Compliance http://www.dir.ca.gov/Public-
Works/SB854.html
Public Works Contractor (PWC) Registration https://www.dir.ca.gov/Public-
Works/Contractor-Registration.html
Classifications and Minimum Labor Rates http://www.dir.ca.gov/OPRL/Pwd/
V. SUBMITTAL REQUIREMENTS
Proposal should be typed, organized and concise, yet comprehensive.
General Requirements
1. Provide a cover letter.
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2. State the interpretation of the work to be performed. State a positive commitment to
perform the work in the required manner and time frame; include a basic summary; and
demonstrate an understanding of the project. Provide a statement that the offer is valid for
at least a ninety (90) day period.
3. Provide the name(s) of the primary and/or alternate individuals authorized to respond to
this RFP. Include titles, addresses, e-mail, and phone numbers.
4. The Consultant is representing itself as a qualified professional in engineering design
services. Therefore, it is acceptable to submit recommendations and comments for
consideration on format, process, schedule, and additional content of projects. The City
will consider comments and recommendations; however is not required to select any of the
recommendations or comments.
5. Expensive bindings, colored displays, promotional materials, etc., are neither necessary
nor desired. Emphasis should be concentrated on conformance to the RFP instructions,
responsiveness to the RFP requirements, and on completeness and clarity of content.
6. If any subcontractors are utilized, the lead Consultant must submit a description of the firm,
the portion of work to be done, and cost of each subcontractor. All subcontracts exceeding
$25,000 in cost shall contain all required provisions of the prime contract.
7. Proof of registration for consultant and sub-consultant shall also be submitted as an exhibit
of the proposal.
Table of Contents
Include a table of contents with identification of each section and page number.
Summary of Qualifications and Experience
1. State whether the firm is local, regional, national or international.
2. Identify the owner(s) of the firm and legal status (sole proprietor, corporation, etc.)
3. Give the location of the office from which work is anticipated to be done and the number
of employees of the company.
4. Identify the qualifications and resumes of all individuals who will be associated with this
service. Include professional registrations and affiliations.
5. Summarize specific experiences and qualification for similar and related projects, both
federally funded and locally funded. Describe the services previously performed such as
studies, reports, etc. List at least three (3) references with telephone numbers and email
contact addresses (if available).
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Analysis of Effort/Methodology
1. Describe the approach for how the work will be performed. The proposal shall indicate any
specific techniques or methodology to be utilized.
2. The proposal shall include a sample project timeline with specific tasks envisioned for this
project, including staffing.
3. Indicate what participation, data and products will be requested from the City.
4. Indicate deliverables to be provided and when.
Cost and Fees
Cost Proposals must be submitted with the proposal in a separate sealed and clearly marked
envelope (include project title and submitting firm). Cost proposals shall take into account the
following:
1. Develop costs and fees for the services requested. Submit a not to exceed fee proposal
based on anticipated fully burdened hourly rates.
2. When preparing cost and fees consider the scope of work involving project kick off and
review of available documentation, material submittals, project documentation and prepare
a lump sum fixed fee breakdown based on anticipated staff and hours. Costs should be
organized for full time hourly rates. Such hourly rates should be fully burdened or loaded,
including full compensation for all overhead and profit. Billing rates shall include provision
for normal office costs, including but not limited to office rental, utilities, insurance, cell
phone or radio, equipment, normal supplies and materials, in-house reproduction services,
and local travel costs. As much as possible, a fixed fee lump sum breakdown by phase of
the construction based on billable hours is desirable for preconstruction and post
construction.
3. Breakdown shall include preconstruction services and construction services (Request for
information/clarification). No subcontractors shall be utilized without prior authorization
by the City and modification to submitted DBE subcontractor's list or goal is discouraged
and may lead to project funding issues.
Insurance Requirements
Prior to execution of the agreement with the City, the successful firm must provide evidence of
insurance coverages as noted in the sample contract and insurance requirements exhibit.
The successful firm will be required to maintain the required coverages, at its sole cost and
expense, throughout the entire term and any subsequent modification terms of the contract.
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Insurance requirements noted in sample contract. Insurance requirements may be adjusted once
the final cost and fees proposal is reviewed.
VI. SELECTION PROCESS
The City of Calexico will utilize a one-step selection process. The City reserves the right to include
an oral interview process component. If an oral interview is considered, selected firms will be
notified.
Proposals will be reviewed by an evaluation committee. The evaluation committee's assessment
and recommendations shall be forwarded to the City Manager for review. The City Manager shall
provide a report of the committee's evaluation and recommendations, along with his
recommendation, for the selection of a firm to the City Council for final review and approval to
enter into negotiations for an agreement.
Additionally, the City reserves the right to reject any and all proposals submitted and/or request
additional information for clarification.
VII. TENTATIVE SCHEDULE
Request for Proposal Issued April 07, 2026
Consultant Proposals Due April 30, 2026 at 2:00p.m.
Consultant Selection and Negotiations Week of May 04, 2026
City Council Approval of Contract May 20, 2026 at 6:30p.m.
Project Completion TBD
VIII. INQUIRIES
Pre-submittal procedural or technical inquires may be directed to Jesus Villegas, Public Works
Director/City Engineer via email at jvillegas@calexico.ca.gov.
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IX. SUBMITTAL DEADLINE
Consultant must submit five (5) copies of their proposal with original Consultant signature. The
proposal must be formatted in accordance with the instructions of this RFP. Promotional material
may be attached, but are not necessary and will not be considered as meeting any of the
requirements of this RFP. Proposals must be enclosed in a sealed envelope or package, clearly
marked "RFP for Engineering Design Services for Chlorine Conversion Project - Gaseous
Chlorine Feed System to Liquid Hypochlorite Feed System" and delivered on or before 2:00p.m.
on Thursday, April 30, 2026 to:
Office of the City Clerk
City Hall
City of Calexico
608 Heber Avenue
Calexico, CA 92231
Late, emailed or facsimile proposals will not be accepted. It is the proposer's responsibility to
assure that its proposal is delivered and received at the location specified herein, on or before the
date and hour set. Proposals received after the date and time specified will not be considered.
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EXHIBIT A
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