Project Information

Bid Title

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

Issuing Agency

City of Calexico

Location

California

Published Date

Apr 8, 2026

Closing Date

Apr 30, 2026

Government Level

State & Local

Status

Closed

Original Source

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Project Description

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

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.

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.

Copy of the Request for Proposals can be obtained at the Public Works Department, 549 Pierce Avenue, Calexico, Calexico, California 92231 or by visiting the City of Calexico website at www.calexico.ca.gov.

Consultant will be required to obtain a City of Calexico Business License once proposal is awarded.

If you have any questions or require additional information, please do not hesitate to contact the Public Works Department at 760/768-2160.

Jesus Villegas Peimbert

Public Works Director/City Engineer

City of Calexico

RFP for Design Services for Chlorine Conversion Project

Attachment Preview

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

I

Introduction and Background

II

Project Posting and Scheduling

III

Scope of Work

IV

Notification of Consultant Registration

Requirements (Where Required)

V

Submittal Requirements

VI

Selection Process

VII

Tentative Schedule

VIII

Inquiries

IX

Submittal Deadline

EXHIBITS

A – Sample Proposal Evaluation Form

B – Sample Consultant Agreement and Insurance Requirements

PAGE

3

3

4

4

5

8

8

8

8

2

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.

3

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).

4

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

Department of Industrial Relations (Public

Works)

SB 854 Fact Sheet

Senate Bill 854 Compliance

Public Works Contractor (PWC) Registration

Classifications and Minimum Labor Rates

WEBSITE

http://www.dir.ca.gov/Public-

Works/PublicWorks.html

https://www.dir.ca.gov/Public-

Works/PublicWorksSB854.html

http://www.dir.ca.gov/Public-

Works/SB854.html

https://www.dir.ca.gov/Public-

Works/Contractor-Registration.html

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.

5

Commodity Codes

• NAICS 541330Engineering Services

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