BPM006010_Solicitation_Attachment_10_Experience_and_Capacity_Response.pdf

Request for Proposal

Solicitation No. BPM006010

ASRAC Assessment and Remediation of Hazardous Substances

Arizona Department of Environmental Quality (ADEQ)

1110 W. Washington Street Phoenix, AZ 85007

Solicitation Attachment – Experience and Capacity Response | Revision No. 1 | Revised 11-22

Attachment 10 – Experience and Capacity Response

ADEQ MAY DETERMINE YOUR PROPOSAL NON-RESPONSIVE IF YOU DO NOT FULLY RESPOND.

The Offeror shall provide a narrative response to each section that demonstrates their understanding of the Scope of Work requirements and describes the company’s overall experience and capacity in providing the Services stated in this Solicitation. If there is a section that is not applicable to the Services required by the Scope of Work, you may mark it “N/A”.

Offeror shall provide a response either after each section or in a separate document entitled: “Attachment - Experience and Capacity Response.” If a separate document is used, please clearly designate each section and double-check to ensure that each question has been answered. If any information provided is considered CONFIDENTIAL by Offeror, the information must be specifically included in the Confidential Information Designation Attachment and related documentation to be assessed for confidential treatment under A.A.C. R2-7- 103.

1.0 Company Profile. The Offeror must include a narrative description of its organization. The narrative must include the following:

1.1 Date Established and ownership (public, partnership, subsidiary, etc.);

1.2 Is the Offeror a national or local company;

1.3 Address of “Main Office” (e.g. Corporate Headquarters and any satellite offices responsible for performance of proposed tasks;

1.4 Brief overview of business operations, with an emphasis on experience in regards to the Scope of Work (limit the response to this question to one page, font size 10 pt or greater);

1.5 Offeror's organizational chart relevant to the Contract, specifically identifying the key point of contact for all questions related to the submitted Offer. In addition, identify key point of contact for Task Order Offer Requests.

1.6 Full disclosure of any potential conflict of interest between the Offeror and any State employee who functions or has responsibilities in the review or approval of the undertaking or carrying out of the Contract;

1.7 A Statement of whether, in the last five (5) years, the Offeror has filed (or had filed against it) any bankruptcy or insolvency proceeding, whether voluntary or involuntary, or undergone the appointment of a receiver, trustee, or assignee for the benefit of creditors, and if so, an explanation providing relevant details and current status;

1.8 A Statement of whether there are any pending Securities Exchange Commission investigations involving the Offeror, and if such are pending or in progress, an explanation providing relevant details and an attached opinion of counsel as to whether the pending investigation(s) may impair the Offeror’s performance in a Contract under this Solicitation;

1.9 A Statement documenting all open or pending litigation initiated by Offeror or where Offeror is a defendant or party in any litigation that may have a material impact on Offeror’s ability to deliver the contracted Services;

1.10 A Statement documenting all open or pending litigation initiated by Offeror or where Offeror is a defendant or party in any litigation with a public sector client;

1.11 Full disclosure of any public sector contracts terminated for cause or convenience in the past five (5) years;

1.12 Full disclosure of any criminal or civil offense.

Offeror Response:

See responses on the following pages: “Offeror Response to Section 1.0”, pages 1 though 5.

OFFERER RESPONSE TO SECTION 1.0 - Page 1 of 5

1.0 Company Profile:

Tetra Tech - Company Profile

Headquartered in Pasadena, California, Tetra Tech, Inc. is a full-service engineering and science firm with a substantial global presence. We help our clients conceptualize and execute innovative solutions to their most difficult problems.

From front-end science and planning to design, construction management and operations, Tetra Tech provides best-in-class experts, with worldwide project experience, to deliver a high level of integrated services in five primary service areas: water, natural resources, the environment, infrastructure, and energy.

Tetra Tech has offices and operational infrastructure throughout the United States, Canada, and abroad. With 28,000 employees in more than 550 offices in more than 120 countries on seven continents, Tetra Tech’s technical knowledge and hands-on site work is broad and deep. Our staff is supported by a uniform administrative and management system that project teams can access immediately to ensure work is completed effectively.

As a leading provider of global engineering and technical services, Tetra Tech offers tremendous staffing capacity through a well-established network of offices and infrastructure throughout the U.S. and abroad—our local presence and global resources serve the full project life cycle. Tetra Tech’s wide office network ensures that our management team has immediate access to the full range of staff and expertise necessary to successfully perform the services required under the ADEQ ASRAC Assessment and Remediation of Hazardous Substances contract.

One of the critical success factors for this project will be the quality of the project team. It is essential that key personnel have the requisite experience, commitment to the project, and expertise to complete the work in an efficient and expeditious manner. With this in mind, Tetra Tech has assembled a highly qualified team with the expertise required to perform a wide variety of investigation, assessment, evaluation, and remediation projects. The project team has worked together to collaboratively support private industry clients as well as state and federal agencies.

In addition to traditional environmental remediation, typically associated with organic contamination of soil and water, Tetra Tech provides a variety of services related to mine closure and reclamation of mining, milling and smelter sites. These services have been provided directly supporting our mining industry client base as well as state and federal agencies. In the field of mine closure and reclamation, our expertise includes over 30 years of experience addressing abandoned or orphaned mining related sites, with all types of wastes and environmental issues, but we also provide closure and reclamation planning, and permitting services for planned or operating mines.

The key personnel currently identified to support the ASRAC program are listed in the Organization Chart provided in Offeror Answer 1.5. Additional information regarding these select individuals are provided in subsequent sections of our response and we understand that the structure and expertise of our project teams will vary according to the needs of each task order. As indicated, Tetra Tech has designated Mekaela Bennett as the point of contact for all questions related to this submittal.

Date Established: 1966

Corporate Headquarters:

3475 E. Foothill Blvd, Pasadena, CA 91107

Main Offices:

4650 E. Cotton Center Blvd., Suite 110, Phoenix, AZ 85040

800 E. Wetmore, Suite 230 Tucson, AZ 85719

NASDAQ symbol: TTEK

Annual Revenue:

$5 Billion (FY2023)

28,000 employees 550 offices worldwide www.tetratech.com

COMPANY FACTS

OFFERER RESPONSE TO SECTION 1.0 - Page 2 of 5

Tetra Tech prides itself on developing collaborative working relationships with all of our clients. Our core principles form the underpinning of how we work together to serve our clients.

Service: Tetra Tech puts its clients first. We listen better to understand our clients' needs and deliver smart, cost-effective solutions that meet those needs.

Value: Tetra Tech takes on our clients' problems as if they were our own. We develop and implement real-world solutions that are cost-effective, efficient, and practical.

Excellence: Tetra Tech brings superior technical capability, disciplined project management, and excellence in safety and quality to all of our work.

Opportunity: Our people are our number one asset. Our workforce is diverse and includes leading experts in our fields. Our entrepreneurial nature and commitment to success provide challenges and opportunities for all of our associates.

Tetra Tech’s philosophy is that cost and quality control start at the beginning of the project with a strong emphasis on planning and controls. Tetra Tech’s system for scope containment involves cost tracking and reporting systems that provide project managers with the resources, tools, and authority to execute projects independently, but within a management envelope that ensures safe, consistent quality performance, on schedule and within budget. In addition to disciplined and efficient cost/schedule support systems, our project teams have made a commitment to technical excellence, quality, and safety throughout the organization to successfully complete projects safely, on time and within budget. We strive to seek out practical solutions to achieve the specific goals and objectives of each client and project. By building upon our collective experience and applying innovative approaches or technologies to specific issues we continually look for opportunities to provide cost risk management and increased value to our clients.

An overarching core value at Tetra Tech is safety, which is integrated into all aspects of our operations and management processes. We believe that all accidents are preventable and maintain a goal of zero incidents. Each employee is responsible for ensuring a safe work environment. Tetra Tech goes beyond simple compliance and implements the same high-level safety processes regardless of the regulatory jurisdiction in which we are working.

1.1 Date Established and ownership (public, partnership, subsidiary, etc.):

The Company was founded over 50 years ago in 1966. We have been providing environmental consulting services in Arizona since 1979.

1.2 Is the Offeror a national or local company:

The Company is an international firm with four offices in Arizona.

1.3 Address of “Main Office” (e.g. Corporate Headquarters and any satellite offices responsible for performance of proposed tasks):

The Company’s Corporate Headquarters is located at 3475 E. Foothill Blvd, Pasadena, CA 91107. The local office with primary responsibility for the performance of proposed tasks is located at 4650 E. Cotton Center Blvd., Suite 110, Phoenix, AZ 85040, however staff from our Tucson and other regional offices are available to support work under this program.

1.4 Brief overview of business operations, with an emphasis on experience in regards to the Scope of Work (limit the response to this question to one page, font size 10 pt or greater):

Tetra Tech was founded as a civil engineering firm by four graduates of the California Institute of Technology and has based itself in Pasadena, California since 1966. Its select group of technical experts provided engineering services for waterways, harbors, and coastal areas. During the 1980s, Tetra Tech met the expanding need for environmental remediation, which involved groundwater modeling, landfill closing, and restoring contaminated military and manufacturing facilities and sites.

OFFERER RESPONSE TO SECTION 1.0 - Page 3 of 5

For more than 55 years, Tetra Tech has been providing innovative solutions to complex environmental problems for public and private sector clients. With an initial focus on water quality issues, Tetra Tech, Inc., has expanded its services to all environmental and engineering disciplines and has remained a leader in developing effective solutions to constantly changing environmental challenges in permitting, due diligence, asbestos, geotechnical, lead-based paint, water, wastewater, air, compliance, hazardous waste, and other areas. The firm also has expanded its environmental engineering and science background to include work in the development of policy and strategic planning, engineering design and construction management for infrastructure projects, information management, and contaminated site investigation and cleanup.

Since its founding, Tetra Tech has provided public and private clients with innovative solutions to complex problems. Tetra Tech is a leading provider of specialized management consulting and technical services in two principal business areas: Infrastructure and Resource Management. Our company offers clients a wide array of services which include research and development, applied science, engineering and architectural design, construction management, energy auditing, and remediation.

1.5 Offeror's organizational chart relevant to the Contract, specifically identifying the key point of contact for all questions related to the submitted offer. In addition, identify key point of contact for Task Order Offer Requests:

, PE

OFFERER RESPONSE TO SECTION 1.0 - Page 4 of 5

1.6 Full disclosure of any potential conflict of interest between the Offeror and any State employee who functions or has responsibilities in the review or approval of the undertaking or carrying out of the Contract:

Tetra Tech conducts a conflict of interest (COI) search screening process prior to accepting any new work, including new work under existing contracts, and prior to submitting any bid or proposal. The screening encompasses:

work related to all sites and clients for whom Tetra Tech performed work over the past 3 years, current Tetra Tech work, and any future Tetra Tech work reflected in ongoing marketing proposals

Tetra Tech identifies potential COI by performing both client database screening and site and facility database screening.

For this effort, no known COIs were identified.

1.7 A Statement of whether, in the last five (5) years, the Offeror has filed (or had filed against

it) any bankruptcy or insolvency proceeding, whether voluntary or involuntary, or undergone the appointment of a receiver, trustee, or assignee for the benefit of creditors, and if so, an explanation providing relevant details and current status;:

Tetra Tech is a publicly held company. Tetra Tech has not filed for bankruptcy or been involved in insolvency proceedings whether voluntary or involuntary, nor has Tetra Tech undergone the appointment of a receiver, trustee, or an assignee for the benefit of credits.

1.8 A Statement of whether there are any pending Securities Exchange Commission investigations involving the Offeror, and if such are pending or in progress, an explanation providing relevant details and an attached opinion of counsel as to whether the pending investigation(s) may impair the Offeror’s performance in a Contract under this Solicitation:

There are no pending Securities Exchange Commission investigation in Tetra Tech whether voluntary or involuntary.

1.9 A Statement documenting all open or pending litigation initiated by Offeror or where Offeror is a defendant or party in any litigation that may have a material impact on Offeror’s ability to deliver the contracted Services;

Tetra Tech does not have any open or pending litigation that would have a material impact on our ability to deliver the anticipated services under this contract.

1.10 A Statement documenting all open or pending litigation initiated by Offeror or where Offeror is a defendant or party in any litigation with a public sector client;

In the normal course of business, Tetra Tech, Inc. is subject to certain claims and lawsuits typically filed against the engineering and consulting professions, including contractual disagreements, workers' compensation, personal injury and other similar lawsuits. Tetra Tech maintains insurance coverage for its business and operations, subject to certain deductibles and policy limits against such claims. As described in Tetra Tech’s most recent quarterly and annual reports filed with the U.S. Securities and Exchange Commission, Tetra Tech believes that the resolution of any such claims will not have a material effect on its financial position or results of operations.

OFFERER RESPONSE TO SECTION 1.0 - Page 5 of 5

1.11 Full disclosure of any public sector contracts terminated for cause or convenience in the past five (5) years;

None of the assembled project team for this contract have been involved in any public sector contracts that have been terminated for cause or convenience within the past five years. During the course of its long history, on very rare occasions Tetra Tech has been involved in circumstances that include termination for cause or termination for convenience, as can be expected of a large multi-national corporation, however, these circumstances are not tracked across the entire Tetra Tech enterprise.

1.12 Full disclosure of any criminal or civil offense.

There is no criminal or civil offense currently involving Tetra Tech that would negatively affect Tetra Tech’s ability to complete services to the State.

ASRAC Assessment and Remediation of Hazardous Substances

Arizona Department of Environmental Quality (ADEQ)

1110 W. Washington Street Phoenix, AZ 85007

Solicitation Attachment – Experience and Capacity Response | Revision No. 1 | Revised 11-22

2.0 Company Experience

The Offeror shall provide the following information to demonstrate their firm’s experience for providing services stated in this solicitation. Use font size 10 pt or greater.

A. Resumes for Key Personnel:

1. Proposed Project Managers: Submit up to five (5) resumes for personnel that will serve as project managers under this contract.

Resumes for the following Project Managers are provided in Attachment 6: Mekaela Bennett, Rob Wilhelm, Angel Cuellar, Ryan Toomey, Ben Weink

2. Technical Specialist: Submit up to ten (10) resumes for personnel that will serve as technical specialists under this contract. A technical specialist is defined as someone with more than ten (10) years of experience that will review the technical aspects of a project including, but not limited to task order proposals, project deliverables, technical reports, design plans, field implementation, etc. A technical specialist is the “expert” at the company.

Resumes for the following Technical Specialists are provided in Attachment 6: Daryl Longwell, Roy Marroquin, Bob Cohen, Joey Pace, William Zahniser, Betty Li, April Hussey, Rick Arnseth, Tim Reeves, Dana Grady

B. Project descriptions (Solicitation document “BPM006010 Solicitation Attachment 10 – Experience and Capacity Response” is deleted in its entirety and replaced with “BPM006010 Solicitation Attachment 10 – Experience and Capacity Response Rev 2024-03-05 Amend 1 below):

Submit up to ten (10) one-page project descriptions of relevant projects that your firm has conducted in the past five years. Relevant projects (in order of relevancy) include the following:

1. Applicable experience includes conducting remedial investigations, design and implementation of remediation systems pump and treat, in-situ systems and soil vapor extraction in the arid southwest (Arizona, New Mexico, Nevada, west Texas, Utah, Colorado, and California). Preparing milestone documents, remedial investigation and feasibility study reports, and utilizing innovative remedial technologies.

2. Each project description shall include the following:

a. Project Name

b. Project Location (City and State)

c. Estimated Project Value

d. Begin and End Date of Project

e. Brief Description of the Project

f. Names of the project manager and key personnel that worked on the project if they are currently employed with your firm.

ASRAC Assessment and Remediation of Hazardous Substances

Arizona Department of Environmental Quality (ADEQ)

1110 W. Washington Street Phoenix, AZ 85007

Solicitation Attachment – Experience and Capacity Response | Revision No. 1 | Revised 11-22

Offeror Response:

See responses on the following pages: “Offeror Response to Section 2.0, B”, pages 1 though 10

Projects, in order of relevancy, include:

1. Incremental Sampling Methodology at the Iron King Mine-Humboldt Smelter

2. Chino Airport Environmental Assessment

3. Statewide Public Water System Sampling for Per- and Polyfluoroalkyl Substances

4. Groundwater Modeling Treatment Design and Build

5. Storm Cloud Mine – Site Characterization & Remediation

6. Soil and Groundwater Remediation System

7. Humboldt Smelter - Stack Demolition

8. Expedited Water Treatment System Design and Construction for Per-and Polyfluoroalkyl

9. Long Term Service to Port of Los Angeles (POLA)

10. AeroSafe Fire Training Area PFAS Data Quality Objectives

Incremental Sampling Methodology at the Iron King Mine-Humboldt Smelter

Dewey-Humboldt, Arizona

Solicitation Attachment – Experience and Capacity Response | Revision No. 1 | Revised 11-22

OFFERER RESPONSE TO SECTION 2.0. B - Project 1 of 10

Project Background

The former Iron King Mine-Humboldt Smelter (IKM-HS) Superfund Site lies within the Town of Dewey-Humboldt and was listed on the United States Environmental Protection Agency’s (EPA’s) National Priorities List in 2008. There are two major contributors to contamination at IKM-HS: (1) Iron King Mine where operations began in the late 1890s and operators extracted, milled and concentrated solid rock ores for lead, zinc, copper, gold, and silver between about 1934 and 1970. (2) The former Humboldt Smelter is where operators purified copper from mine ores between for decades.

The contamination that remains today (tailings, waste piles, slag, etc.) is from these historical operations. In addition, the former Humboldt Smelter is impacted by aluminum dross which was crushed and spread across the site in the 1950s.

Summary

In 2023, Tetra Tech prepared two site-specific Quality Assurance Project Plan/Sampling and Analysis Plan (QAPP/SAP) documents, one for the Iron King Mine and one for the Humboldt Smelter. Both of these documents were reviewed and approved by the EPA Region 9 Quality Assurance Manager, the EPA Remediation Project Manager, and the ADEQ Project Manager. These documents detailed the field work to perform Incremental Sampling Methodology (ISM) at the two sites. Integral to ISM sampling is the sampling design, which is fundamentally based upon establishing decision units (DUs). DUs are the smallest volume of soil (or other media) for which a decision is made in an ISM sampling program and are designated based on the assessment of risk or optimization of anticipated, remedial actions. When conducting ISM, DUs are sampled incrementally. Sampling is completed in an orthogonal pattern, and a composite is made of the increments to result in one sample representative of exposure across the entire DU. In an established percentage of the DUs, three samples (replicate samples) are collected to show repeatability and project Data Quality Objective conformance. DUs for both sites were sampled at a size of 1-acre for Industrial DUs (IDUs) and 0.25-acre for residential DUs (RDUs).

Project Detail Samples were collected using a power drill with a special hand-drill auger bit made for soil collection and were composited via a hand-drill adapted soil collection bucket. Every DU increment was hand-drilled (>23,500 hand-drilled increments for the combined projects, resulting in >900 samples), composited into the collection bucket, containerized for shipment, and shipped on ice to the laboratory for analysis of 13 Priority Pollutant metals (ISM project-specific constituents of concerns (COCs) were arsenic and lead). The following table presents the highlights and accomplishments of the two ISM projects, which were completed concurrently over a period of three months, from September through December 2023.

Project Measurements Iron King Mine Humboldt Smelter

RDUs Sampled (0.25-acre) 390 22

IDUs Sampled (1-acre) 215 96

RDUs with Replicates (target 10%) 52 (13%) 8 (36%)

IDUs with Replicates (target 10%) 26 (12%) 9 (9.5%)

Total Residential ISM Samples Collected 496 38

Total Industrial ISM Samples Collected 287 114

Total ISM Soil Samples Collected 783 152

Aqueous Field Blanks Collected (target 1 in 20 or 5%) 41 (5.2%)

Aqueous Equipment Blanks Collected 49 19

Days in Field Sampling* (*excludes other field-related ISM tasks) 48 19

Samples Passing Data Validation Check for Project COCs 100% 100%

PROJECT VALUE

$1,442,647.28

PROJECT DURATION

2022-Present

MAIN PROJECT STAFF

Mekaela Bennett, EIT Project Manager

Joey Pace, PMP Writer/Technical Support

Chino Airport Environmental Assessment

County of San Bernardino, CA

Solicitation Attachment – Experience and Capacity Response | Revision No. 1 | Revised 11-22

OFFERER RESPONSE TO SECTION 2.0. B - Project 2 of 10

Project Background

Tetra Tech is currently under its fourth contract with the County of San Bernardino providing environmental technical support, strategic planning, and the management and execution of all investigations and cleanup activities required for compliance with the California Regional Water Quality Control Board’s (CRWQCB) cleanup and abatement order.

Vapor Intrusion and Shallow Soil Investigation

Tetra Tech performed a supplemental vapor intrusion and shallow soil investigation at the Airport. During this investigation, the County completed 88 shallow soil borings across 18 AOCs and installed 14 soil vapor monitoring probes (VMPs) to evaluate potential risks associated with chemicals of potential concern (COPC). The supplemental data collection was to provide additional data for the remedial design and evaluation of onsite Land-Use Covenants (LUCs). The soil gas samples were collected in areas over the volatile organic compound (VOC) plumes in groundwater to evaluate the potential for vapor intrusion into indoor air. The second phase of the investigation involved the installation of 90 VMPs and sub-slab probes to delineate the soil gas impacts in these three AOCs.

Groundwater Monitoring Program

Tetra tech implemented a monitoring program to maintain compliance with the CRWQCB’s cleanup and abatement order. The current groundwater monitoring program consists of water level and water quality data collection from over 115 monitoring locations. The purpose of the groundwater monitoring program is to track detections of chemicals in groundwater related to past Airport activities. In addition to monitoring for the CRWQB’s cleanup and abatement order, baseline raw water characterization is being performed for the State Water Resources Control Board Division of Drinking Water (DDW) since the selected remedy is being implemented within an Extremely Impaired Source for a drinking water supply.

Numerical Groundwater Flow and Contaminant Transport Modeling

Tetra Tech used an existing regional model to develop a site-specific model for Chino Airport for evaluation of remedial alternatives in the feasibility study. Groundwater modeling was conducted to assess the viability of using groundwater extraction as a means of hydraulic containment to control plume migration for both of the plumes which were identified as a result of the groundwater remedial investigation. In revising the model, Tetra Tech reduced its extent, subdivided its layers for better refinement of the Site geology, and revised hydraulic parameters to better match the local potentiometric data. To support this approach, more recent data were obtained where possible to define the local potentiometric surfaces and extraction influences. The recent data was used to perform a steady-state calibration for evaluation of full capture of the plume using particle tracking. The model was then updated using aquifer testing data to calibrate the site-specific groundwater flow model to transient conditions. The transient groundwater flow model was used to assist with the final remedial design. Once the remedy is installed, the transient groundwater flow model will be updated to incorporate updated information and used to assist with evaluating the performance of the extraction system and assessing if the remedial action objectives are being met.

Remedial Action Plan, Remedial Design, and Engineering Services During Construction

Tetra Tech prepared the CRWQCB approved Final Interim Remedial Action Plan (IRAP). The selected remedy outlined in the IRAP consists of groundwater extraction for plume containment and ex situ treatment of the extracted groundwater, along with institutional controls and monitored natural attenuation. Tetra Tech prepared the remedial design for the 10 extraction well sites and the conveyance system that will connect the extraction wells to the treatment system. The groundwater remediation system includes the development of 10 well sites; drilling, construction, and equipping of 22 individual wells, and the installation of 4.5 miles of raw water conveyance piping. The groundwater remediation system includes treatment through granular activated carbon (GAC) at the Chino Basin Desalter Authority’s Plant No. 1 where the product water will undergo further treatment before being delivered to their member agencies as drinking water. Tetra Tech is currently providing engineering services during construction, construction inspections, and full-time oversight of all drilling and well installation activities.

PROJECT VALUE

$5,900,000

PROJECT DURATION

2018-Present

MAIN PROJECT STAFF

Ben Weink, P.G.

Project Manager

Statewide Public Water System Sampling for Per- and Polyfluoroalkyl Substances

Arizona

Solicitation Attachment – Experience and Capacity Response | Revision No. 1 | Revised 11-22

OFFERER RESPONSE TO SECTION 2.0. B - Project 3 of 10

Project Background

In 2022, ADEQ committed $3,000,000 of Safe Drinking Water Act funds to test every public water system in Arizona for per- and polyfluoroalkyl substances (PFAS). Subsequently, ADEQ implemented a statewide PFAS sampling program which targets sampling all Arizona public water system (PWS) facilities, an approach which is more conservative than the January 2023 requirements of United States Environmental Protection Agency (USEPA) to only sample PWS facilities that serve more than 3,300 customers. ADEQ’s approach is meant to pro-actively protect all citizens on public water supplies in Arizona.

Project Summary

Tetra Tech’s scope of work for the Statewide PWS Sampling for PFAS Project involves water quality sampling for up to 764 PWS facilities. The samples are collected by Tetra Tech and delivered to a Phoenix laboratory that specializes in PFAS testing using USEPA Method 537.1 and USEPA Method 533. The target number of samples collected per week is 50, with each sample collected from a PWS Entry Point to the Distribution System (EPDS).

The number of EPDS varies per facility, usually with multiple EPDS at larger distribution systems. Tetra Tech samplers underwent a training provided by ADEQ prior to initiating the sampling program.

Project Detail When initially awarded the project in September 2023, Tetra Tech was assigned approximately 150 facilities in Coconino and Yavapai counties. The PWS facility sampling program is on a 90-day compliance cycle, and Tetra Tech was to prioritize facilities not previously sampled by ADEQ, or facilities approaching or exceeding 90 days from the last sampling event. Tetra Tech was responsible for contacting the facilities, setting up the sampling schedule, picking up bottleware from the laboratory, sampling the facilities, couriering the samples to the laboratory, and providing sampling documentation to ADEQ. Shortly after the initial project award, Tetra Tech was awarded the remaining facilities in the state. This includes:

County PWS County PWS

Apache 18 Mohave 56

Cochise 63 Navajo 43 Coconino 33 Pima 140

Gila 51 Pinal 52 Graham 5 Santa Cruz 19

Greenlee 6 Yavapai 123 La Paz 22 Yuma 29

Maricopa 104 Total: 764

Tetra Tech’s team follows a rigid PFAS Field Sampling Preparation, Collection and Audit Checklist, which includes, but is not limited to, good housekeeping such as wearing cotton clothing that has been washed several times without the application of fabric softener, use of aluminum or Masonite clipboards, use of traditional ball-point pens or pencils, avoiding all cosmetics, scented products, moisturizers, and/or insect repellents on day of sampling, and avoiding contact with all waterproofing agents and waterproof clothing. In addition, only certified laboratory sealed/supplied bottleware is used, as well as regular (water) ice, laboratory supplied coolers and bags for sample storage, and use of a clean pair of nitrile gloves for every sample collected.

As of March 15, 2024, Tetra Tech has sampled over 280 unique facilities as part of the Statewide PWS Sampling for PFAS Project, accounting for over 400 field samples collected.

PROJECT VALUE

$775,000

PROJECT DURATION

August 2023-Present

MAIN PROJECT STAFF

Mekaela Bennett, EIT Project Manager

Alicia Williams Project Administrative Support

Groundwater Modeling Treatment Design and Build

San Bernardino County, California

Solicitation Attachment – Experience and Capacity Response | Revision No. 1 | Revised 11-22

OFFERER RESPONSE TO SECTION 2.0. B - Project 4 of 10

Project Background and Summary

An aerospace company operated a rocket testing facility between the mid-1950s and mid-1970s in a groundwater basin in San Bernardino County California. The groundwater basin encompasses an area of approximately 120 mi2 in the upper Santa Ana Valley.

Tetra Tech has managed this project for our client for over 30 years and the project has encompassed all aspects of a project life cycle from characterization to remediation, operations and maintenance, and multiple stakeholder interface and regulatory negotiations.

Work elements have included characterization of the extent of a 10-mile long 3-mile wide solvent and perchlorate plume, construction of a 3-dimensional fate and transport groundwater model that encompasses the majority of the 120 mi2 groundwater basin, and design and treatment of potable production wells to remove volatile organic compounds (VOCs) and perchlorate. The treatment systems are capable of treating over 20,000 gallons per minute (gpm) for potable supply for four water purveyors in the Basin. Key elements of work related to plume characterization, 3D groundwater modeling, information management, and design/build treatment facilities are provided below.

Plume Characterization: Since 1994, Tetra Tech has performed a variety of tasks to characterize the extent of the perchlorate and TCE plumes. Since 1996, Tetra Tech has installed 18 multiport (Westbay) monitoring wells with up to 10 ports each at depths to 1,100 feet below ground surface (bgs). Since project inception, Tetra Tech has sampled over 200 wells and has collected over 50,000 groundwater samples.

Samples are routinely analyzed for VOCs and perchlorate. Additionally, samples have been collected and analyzed for emergent compounds including PFAS compounds, 1,4-dioxane, 1,2,3-trichloropropane (TCP), dibromochloropropane (DBCP) radionuclides, and stable isotopes. Data generated from the groundwater sampling program is entered into the project data base and is used in the 3D flow and transport groundwater model and extracted for reports submitted to project stakeholders.

3D Fate and Transport Groundwater Modeling: Analytical results from plume characterization activities described above are used to build and update the groundwater model. The model contains six layers, includes over 650 wells and/or monitoring points, and extends across a 100 mi2 area. The groundwater model is used to evaluate TCE and perchlorate plume migration over time through the basin. The model predicts TCE and perchlorate impacts at municipal production wells. The groundwater flow model in conjunction with the water system blend model are used to predict the timing, the magnitude of impact, the need for treatment, the duration of treatment, when the treatment can be suspended, and the associated costs. Model predictions typically run for 20 years; however, in certain applications model predictions have been extended to over 50 years.

Treatment Plant Design & Build: Tetra Tech has designed and built several regional and stand-alone treatment plants to remove VOCs, perchlorate for potable supply. Treatment includes removal of TCE by granulated activated carbon (GAC) and removal of perchlorate by ion exchange (IX). To date, the combined treatment capacity exceeds 20,000 gpm. In addition to VOC and perchlorate removal, the treatment plants remove emergent compounds including: PFAS, TCP, DBCP to potable standards.

Information Management: The Tetra Tech team developed a user-friendly project database that stores analytical, water level, production, well construction data, collected by Tetra Tech and others in the basin. The existing database houses over 3 million project-specific records. The project database allows project team members access to up to date project-related data wherever there is an internet connection.

Project Value

$50,000,000

Project Duration

1994-Present

Project Staff

Project Manager Roy Marroquin

Plume Characterization Don Lee, PG, CHG Willow Green, PG Joseph Aguirre

Groundwater Modeling Pete Andersen, PE Jie Xu, PhD

Groundwater Treatment Design & Build Steve Tedesco , PE

Storm Cloud Mine – Site Characterization & Remediation

Yavapai County, Arizona

Solicitation Attachment – Experience and Capacity Response | Revision No. 1 | Revised 11-22

OFFERER RESPONSE TO SECTION 2.0. B - Project 5 of 10

Project Background

The Storm Cloud Mine is an inactive gold and silver mine located approximately eight miles south/southeast of Prescott and nine miles west/southwest of Mayer, Arizona in the Mountain Pine Acres subdivision. Tetra Tech was contracted by the Arizona Department of Environmental Quality (ADEQ) to conduct an assessment of the Site, perform preliminary site investigations, evaluate potential remedial actions to reduce water quality impacts, and complete final designs and implement the selected action.

Investigation and Site Assessment

Tetra Tech performed a phased investigation of the Site to assess the Site access, current conditions, perform a drone survey, and collect samples of the mine waste. A collapsed adit was discovered on the Site.

Based on the results of the Site investigations Tetra Tech developed a remediation plan to regrade the primary mine waste pile and cover the waste with clean cover soil to prevent further erosion of the pile and minimize water contact with the mine waste material. Replacement of two existing culverts was incorporated into the remediation design due to the deteriorated condition of the existing corrugated metal pipe. To manage the water discharging from the collapsed adit, a conveyance was designed to direct this water to the entrance of one of the new culverts to prevent the water from flowing over and through the mine waste material. Tetra Tech completed 404 permitting requirements prior to implementation.

The project required a Construction General Permit (CGP) and associated Stomwater Pollution Prevention Plan (SWPPP) due to the area and location of disturbance.

Implementation

Tetra Tech initiated the implementation of the remediation plan in November 2020. The primary mine waste pile was regraded and covered with clean soil (18-inch soil and 6-inch rock over). The existing drainage channel, which cut through the pile, was relocated further east to clean soil, and a road was constructed between the pile and the new drainage channel to provide access to the properties located south of the Site. The waste pile was regraded to approximate 3H:1V slopes and covered with fabric and clean cover material. A failing wood crib wall was removed and disposed of off-site.

The deteriorated existing 72-inch culvert was replaced with a culvert of equal length. The 48-inch culvert was originally to be replaced with a culvert of equal length. However, a longer culvert was deemed necessary to convey flow in the drainage from the east side of the new access road, under Tanya Drive, to the original discharge point of the existing 48-inch culvert.

To manage the water discharging from the collapsed adit, an 18-inch pipe was installed to direct this water to the entrance of the culvert under Tanya Drive and to prevent the water from interacting with the mine waste pile. Associated SWPPP inspections were conducted for the duration of the project.

Site construction was completed in late December 2020 and a Notice of Termination was filed thereafter.

PROJECT VALUE

$595,000

PROJECT DURATION

June 2020 – December 2020

PROJECT STAFF

Daryl Longwell, PE Project Manager

Mekaela Bennett Assistant Manager

Tim Reeves Water Quality Lead

Soil and Groundwater Remediation System City of Industry, CA

Solicitation Attachment – Experience and Capacity Response | Revision No. 1 | Revised 11-22

OFFERER RESPONSE TO SECTION 2.0. B - Project 6 of 10

Key Features

Tetra Tech implemented the following cost-saving and sustainability measures for this ongoing long-term project:

Negotiated an agreement with local water purveyor to accept treated effluent water for beneficial end-use as reclaimed water. Prior to this change, the treated effluent water was discharged to the storm drain under a National Pollutant Discharge Elimination Systems permit.

Implemented passive diffusion bags for groundwater sampling to conserve water and save costs. Previously, the purge and bail method was utilized.

Reduced groundwater sampling frequency from six to two times per year.

Conducted a hydrogeological analysis, including plume mapping and groundwater modeling, to support remedial design efforts.

Installed extraction wells in the Puente Groundwater Basin to significantly reduce water removal costs.

Conducted multiple iterations of indoor air sampling and risk assessment to demonstrate safe indoor working conditions for personnel.

Prepared and distributed public notification for drilling and monitoring projects.

Performed on-call services to repair well plumbing, electrical, and an aged extraction well network operation

Project Description

Tetra Tech was contracted to operate and maintain a groundwater pump-and-treat system and soil vapor extraction system in 2000.

The primary chemical of concern in both soil and groundwater is tetrachloroethylene. Tetra Tech was responsible for operating and maintaining both systems. The scope of work included routine maintenance, system repairs, permit compliance and reporting, semi-annual groundwater monitoring of approximately 70 wells, and all influent and effluent process sampling.

The groundwater pump-and-treat system consisted of 18 extraction wells (located in the source area and downgradient of the source), system conveyance piping, and four air stripping towers. Extracted groundwater was treated and discharged to a local water purveyor for beneficial end-use as reclaimed water. The emissions were directly discharged pursuant to a permit issued by the South Coast Air Quality Management District.

The soil vapor extraction system consisted of over 8 vapor extraction wells, conveyance piping, two 1,200-cfm blowers, and granular activated carbon vessels.

PROJECT DURATION

2000 - Current

PROJECT VALUE

Annual Revenue ~$400,000

Conception-to-date ~$10M

PROJECT STAFF

Betty Li, PG Project Manager/Senior Hydrogeologist

Humboldt Smelter – Stack Demolition

Dewey-Humboldt, Arizona

Solicitation Attachment – Experience and Capacity Response | Revision No. 1 | Revised 11-22

OFFERER RESPONSE TO SECTION 2.0. B - Project 7 of 10

Project Background

The Humboldt Smelter Project (the Site) is located in the town of Dewey-Humboldt, Yavapai County, Arizona. The Site occupies approximately 31 acres east of State Route 69 on the plateau of the former Humboldt Smelter which is located within the Iron King Mine-Humboldt Smelter Superfund Site, where the United States Environmental Protection Agency (EPA) is the lead agency. From years of environmental exposure, the smokestack and converter flue had undergone severe deterioration. Large sections of brick had fallen away and left significant voids in the walls of the converter flue. In July 2021, a significant portion of the converter flue collapsed during a monsoon. A total or partial collapse of the structure was imminent, posing a safety risk to trespassers.

Summary

In January 2022, the Arizona Department of Environmental Quality (ADEQ), in coordination with Tetra Tech and its subcontractors, completed the careful dismantling of both the smokestack and what remained of the attached converter flue. This work was completed in accordance with the ADEQ-approved documents (Work Plan, Noise Control Plan (NCP), and Dust Control Plan (DCP)). All necessary permitting was obtained prior to work commencing (e.g. Arizona Pollutant Discharge Elimination System Construction General Permit). Takedown of the stack was conducted utilizing a Cat 5130B and Cat 385 excavator with a hydraulic driven Rainmaker for dust control. All brick debris were consolidated in place around the stack foundation and encapsulated utilizing shotcrete. All work performed adhered to the requirements of Yavapai County, ADEQ, and the Town of Dewey-Humboldt. Additional fencing was installed within the smelter plateau to further deter trespassers.

And finally, two acres of the dust-control cover (Posi-Shell®), previously installed by EPA, was sprayed with a fresh Posi- Shell® application to repair areas disturbed during the project.

Project Detail Controlled takedown of the stack was conducted in January 2022. The Cat 5130B started at the top of the smokestack taking down brick structure by pushing away from the machine to collapse the bricks into the center and sides of the smokestack.

This process continued from the top to the bottom in controlled increments. A stop work was called on the first day due to shifted wind direction. Ground surface watering was conducted around the stack for the remainder of the day due to high winds in excess of 15 mph. Takedown activities resumed the following day and continued until the stack reached the level of the converter flue and it was no longer feasible to utilize the Cat 5130B. The Cat 5130B was demobilized to the laydown yard and a smaller excavator was mobilized to complete the remainder of the takedown activities. A total of 176 cubic yards of shotcrete material was placed over the debris.

During the controlled takedown of the smelter and flue, Tetra Tech monitored noise and vibration levels, per the NCP. Three separate monitoring stations were set up at the borders of the site to assess noise and vibration disturbances to nearby residential areas. Initial noise monitoring prior to takedown activities was conducted continuously to establish a baseline for noise and vibration, and stations remained in place throughout takedown activities to continuously measure noise and vibration effects to neighboring residential areas, during which time there were no exceedances for noise or vibration exposure limits.

Per the DCP, Tetra Tech performed monitoring for dust control, asbestos, and metals. The monitors operated beginning 24 hours prior to takedown and continuing to run during takedown activities and for 24 hours after takedown was complete.

In addition, Tetra Tech placed a DustTrak monitor near the onsite personnel observation area during active takedown, to ensure respirable dust levels were not exceeded for the Level D Personal Protective Equipment selected for personnel in the exclusion zone.

Also part of the DCP, metals monitoring (for inhalation) occurred at three locations near the property boundary. Stations remained throughout the project, as prevailing winds remained consistent according to the on-site meteorological station.

Tetra Tech’s air monitoring included asbestos, arsenic, barium, cadmium, chromium, lead, mercury, selenium, and silver.

There were no exceedances of the applicable standards for asbestos detected in any samples. Furthermore, of the more than 30 samples collected for metals before, during, and after demolition, only six samples had detections of metals, all of which were below applicable OSHA and NIOSH standards.

PROJECT VALUE

$1,200,000

PROJECT DURATION

2021-2023

MAIN PROJECT STAFF

Mekaela Bennett, EIT Project Manager

Ryan Toomey Air Quality

Expedited Water Treatment System Design and Construction for Per- and Polyfluoroalkyl Substances, Nevada

Solicitation Attachment – Experience and Capacity Response | Revision No. 1 | Revised 11-22

OFFERER RESPONSE TO SECTION 2.0. B - Project 8 of 10

Key Features o Ex-situ groundwater treatment system to mitigate the impacts of groundwater contamination on a public water supply.

o Fast-tracked permitting, design, and construction in under 15 months in response to a State of Nevada-issued expedited cleanup order.

o Multi-disciplinary Tetra Tech team completed all aspects of the project and achieved startup within the aggressive order timeline.

o Operation with greater than 99.9% uptime and over 870 million gallons treated.

Project Description

Groundwater contamination from a former industrial site migrated off site into developed neighborhoods and spread towards a nearby river and public water supply. In response to a State-issued expedited cleanup order, Tetra Tech performed fast-tracked permitting, design, construction, and startup of an ion exchange water treatment system in under 15 months. This impressive feat included construction of the main water treatment plant and two pump stations with pipelines without incident.

The treatment system design required the flexibility to handle varying suspended solids loads, flows of up to 6,900 gallons per minute (gpm), and ion exchange treatment for perchlorate. The project was expedited. The treatment system design required the flexibility to handle varying suspended solids loads, flows of up to 6,900 gpm, and ion exchange treatment for perchlorate. Based on our experience with similar systems, our engineers recognized the need to first develop specifications for critical, hard to find components early.