WSP-CA-Landfill Gas Services

LANDFILL GAS SERVICES CALIFORNIA

Statement of Qualifications

CONTENTS

WSP OVERVIEW 1 LANDFILL GAS SERVICES 3 CAPABILITIES 5 PROJECTS 9 TEAM 13

SOQ | Landfill Gas Services in California

WSP OVERVIEW

WSP TODAY WSP is one of the world’s leading professional services firms, uniting its engineering, advisory and science-based expertise to shape communities to advance humanity. From local beginnings to a globe spanning presence today, WSP operates in over 50 countries and employs approximately

73,000 professionals, known as Visioneers.

Together they pioneer solutions and deliver innovative projects in the mining and metals, environment, transportation, infrastructure, buildings, water, and energy sectors.

3 No.

Top 150 Global Design Firms Engineering News-Record 2025 Rankings

50 Countries

6 Continents

73,000+ Global Employees

WSP has 45+ years of service to the waste industry, successfully completing projects at over 1,450 waste management facilities in 30 countries on six continents.

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WSP Overview

FUTURE READY ®

WSP is committed to building ESG principles and processes into everything we do for our clients, applying our “future-ready” approach to help you anticipate, plan for and implement your Sustainability Goals. We have developed an ESG Framework (Scorecard) as a way of demonstrating and in some cases quantifying, how we have integrated ESG considerations into our client projects across the full spectrum of engineering services for our mining clients. With Future Ready ® we see the future more clearly and challenge our teams across the world to advise and design for this future as well as today.

We are one of the world’s leading professional

services firms, uniting our engineering, advisory and

science-based expertise to make a positive impact. We envision future possibilities and bring them to life through technical know-how and innovation.”

We analyze future trends through 4 lenses

Climate

Society

Technology Resources

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SOQ | Landfill Gas Services in California SOQ | Landfill Gas Services in California

OUR SERVICES SPAN

Strategy and Policy Development

Site Waste Management Plans

Legislative Advice

Environmental Permitting

Mechanical, Biological and Thermal Treatment Options

Waste Audits and Minimization Strategies

Recycling and Composting Collection Methods Strategies and Master Plans for New Developments

Clinical and Hazardous Waste Management

Procurement Assistance

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Our Services Span

Financial Models and Financial Assurance Documentation Construction Administration and Inspection and Testing Services

Technology Appraisals and Feasibility Studies

WRATE Modeling

Waste Composition Analysis and Program Management Landfill, Leachate Treatment and Biogas Collection System Design

Design, Operations and Closure Plans

Compliance Monitoring Programs

Waste Site Rehabilitation

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SOQ | Landfill Gas Services in California

WSP LANDFILL GAS SERVICES IN CALIFORNIA WSP IS ONE OF THE WORLD’S LEADING ENGINEERING AND ENVIRONMENTAL PROFESSIONAL SERVICES FIRMS. As a single-source provider of both technical and advisory services, WSP helps its clients reduce risk while saving time and resources. Our staff are considered local and regional experts in the following subject matters: landfill gas design, operations and maintenance, and compliance, hydrogeologic assessments and design, and groundwater sampling and reporting. WSP locations

CA

Republic Environmental solutions locations Republic Recycling and solid waste locations

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WSP Landfill Gas Services

WSP’s unique balance of skills, experience, and a proven track record with our solid waste clients makes us one of the foremost landfill consulting firms in the region. With several offices in California, we are well situated to service Republic’s ongoing operation and maintenance needs. Our skills, combined with a focus on clients’ local needs and constraints, enables WSP to offer technical excellence in our practical, safe, and cost-effective services.

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SOQ | Landfill Gas Services in California

CAPABILITIES CALIFORNIA LANDFILL GAS

OUR LFG EXPERIENCE LFG assessment and design „ Design of new LFG management systems (passive and active) „ Assessment of existing systems (performance improvement) „ Beneficial uses of LFG „ LFG to energy project assessment and design Due Diligence Services „ Existing project evaluation „ Market analyses „ Phase 1 environmental assessments

„ Gas generation modeling and resource assessments „ CQA „ LFG permitting and compliance „ Title V permitting „ Prevention of significant deterioration permitting and air toxics modeling

„ Compliance monitoring and reporting „ Subtitle D permitting and compliance „ LFG migration assessments

„ Compliance audits „ LFG management system performance audits

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Capabilities

LANDFILL GAS SITES AND SERVICES

Services Provided LFG OM&M LFG

Client Name / Location

Landfill Site Name

Engineering

All Purpose Landfill (LF)

City of Santa Clara

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■

Hay Road LF

Recology, Vacaville

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■

Ostrom Road LF

Recology, Wheatland

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■

Yuba Sutter LF

Recology, Marysville

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■

Pacheco Pass LF

Recology, Gilroy

■

■

Lompoc LF

City of Lompoc

■

■

John Smith Road LF

WCI, San Benito County

■

Auburn Placer LF

Recology, Auburn

■

Monterey Peninsula LF

ReGen Monterey, Marina

■

■

Neal Road Recycling and Waste Facility

Butte County

■

■

Bedwell Bayfront Park LF

City of Menlo Park

■

■

Byxbee Park LF

City of Palo Alto

■

Burbank LF #3

City of Burbank

■

■

Clover Flat LF

WCI, Calistoga

■

■

Singleton Road LF

City of San Jose

■

■

Western Placer Waste Manage ment Authority (WMA), Lincoln

Western Regional Sanitary LF

■

American Avenue DS

Fresno County

■

Guadalupe Refuse DS

WM, San Jose

■

Santa Maria LF

City of Santa Maria

■

Potrero Hills LF

WCI, Fairfield

■

American Canyon Sanitary LF

Napa Vallejo WMA

■

■

Southeast Regional DS

Fresno County

■

Pacheco Pass LF

Gilroy, CA

■

■

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SOQ | Landfill Gas Services in California

PROJECTS LANDFILL GAS

By selecting the WSP team, you can be confident that we will devote an accomplished and strategic assemblage of specialists to your project. Advantages of choosing our team include: Large in-house technician staff with the ability to mobilize effectively with short notice. Experienced project managers across a broad spectrum of services including: z Landfill gas collection and control systems (GCCS) design z Construction Quality Assurance (CQA) z Landfill gas collection and control systems operations and maintenance z Evaluation monitoring programs z Corrective action monitoring programs z Reasonably foreseeable release scenarios and corrective action cost estimates z Detection monitoring programs z Perimeter landfill gas migration monitoring plan z Geologic fault activity evaluations z Water quality monitoring and reporting

Project Location: Palo Alto, California WSP has provided The City of Palo Alto with a broad range of engineering and environmental services that include: Final Closure and Postclosure Maintenance Plan: WSP prepared an updated Final Closure and Postclosure Maintenance Plan that includes a proposed engineered alternative design ET cover system. The project includes the preparation of construction plans, specifications for the closure of the final 50-acre landfill and the installation of a landfill gas collection and leachate controls. There were siting concerns for the flare as it was in a park developed on the closed landfill. WSP integrated a new flare station design into a waste gas energy application in the City’s water pollution control plant. WSP investigated the use of a very low profile flare to reduce visibility and/or noise impacts to the adjacent park users. This combustion unit has a diffused and silent flame front that is less than four inches above the burner surface and produces low NOx emissions. A 400 standard cubic feet per minute (scfm) unit can be less than 15-feet tall, compared to a conventional flare stack which might be 25 or 30 feet tall. Environmental Monitoring: WSP has completed the environmental monitoring and reporting since 2005. Conducting sampling and analyses, providing onsite monitoring and preparing reports related to the landfill’s gas, leachate and groundwater monitoring systems at the Palo Alto Landfill. CITY OF PALO ALTO LANDFILL

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Projects

CITY OF MENLO PARK

Project Location: Menlo Park, California WSP has and is currently providing a broad range of engineering and environmental monitoring services to the City Menlo Park. Landfill Gas System Operation and Maintenance: WSP provides comprehensive services for landfill gas collection and control systems (GCCS), supporting both operational reliability and regulatory compliance at Bedwell Bayfront Park Landfill in Menlo Park. Our scope includes routine system maintenance, performance monitoring, and full-spectrum compliance management. Scope of Services Alarm Response & Repairs: WSP responds promptly to system alarms and performs minor repairs on condensate sump components, laterals, headers, extraction wells, and leachate pumps. For example, at Bedwell Bayfront Landfill Park (BBLP), we addressed flare shutdowns due to utility disruptions and conducted maintenance on flow sensors to minimize downtime Monitoring & Reporting: We conduct surface emissions monitoring and perimeter landfill gas assessments. Monthly and annual reports are prepared in accordance with Bay Area Air Quality Management District (BAAQMD) Rule 8-34-113 and other applicable regulations. In June 2025, our team documented flare operation metrics, wellhead oxygen levels, and positive pressure conditions,

recommending liquid level adjustments to restore vacuum conditions Regulatory Alignment & Compliance: All activities are performed in compliance with local, state, and federal environmental regulations. Our work supports clients like the City of Menlo Park and Oakland Public Works in meeting their long-term trash reduction plans and stormwater program requirements Client Engagement & Communication: WSP maintains active communication with city officials and project stakeholders. For instance, we coordinated with Ciara Shirey and Kaila Jones to finalize and submit monthly O&M reports and gas data logs Landfill Gas Collection and Control System Improvements: In 2021, WSP provided engineering support services for the improvement of the GCCS at BBLP. WSP developed improvements for the gas extraction wells and ancillary piping. The improvements included: permitting and providing construction plans and specs, bid assistance and construction management for replacing 500 feet of vertical LFG extraction wells, 6,000 feet of HDPE pipe, 46 wellheads, 81 vaults, and 12 leachate sump pumps, control panels, and ancillary piping.

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SOQ | Landfill Gas Services in California | Landfill Gas Services in California

PROJECTS LANDFILL GAS

RECOLOGY PACHECO PASS LANDFILL

Project Location: Gilroy, California WSP has provided Recology with a broad range of engineering and environmental services that include: Landfill Gas Flare Replacement: Most recently, WSP provided engineering support services for the design and construction of an enclosed flare replacement project. WSP developed the design and specifications to decommission the existing flare and install a smaller enclosed flare due to decreasing methane production at the closed landfill. WSP managed the permitting process for installation, including obtaining Authority to Construct from the BAAQMD and approvals from the Santa Clara County Department of Planning and Development. Additionally, WSP conducted engineering reviews of the contractor’s work and responded to requests for information during the construction phase. Upon completion of the flare installation, WSP assisted in obtaining the Permit to Operate from the BAAQMD.

Environmental Monitoring: Since 1997, WSP has been responsible for environmental monitoring and reporting for Recology Pacheco Pass. This includes conducting sampling and analysis, onsite monitoring, and report preparation related to the landfill’s gas, leachate, and groundwater monitoring systems at the Pacheco Pass Landfill. Landfill Gas System Operation and Maintenance: WSP provides services for the landfill gas collection and control systems, including routine maintenance, monitoring, and compliance management. This work includes responding to alarm system callouts, performing periodic minor repairs on condensate sump components, laterals, headers, extraction wells, and leachate pump replacements/repairs. Additionally, WSP assists Recology with scoping and budgeting for recommended improvements or parts and materials.

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Projects

RECOLOGY HAY ROAD

Project Location: Vacaville, CA WSP has provided comprehensive landfill engineering services to Recology Hay Road for most of its disposal cell developments and operations. These services include landfill disposal cell and gas collection system (LGCS) design and construction quality assurance (CQA). Landfill Gas System Design: WSP designed a LGCS Master Plan to address future lateral expansion of Recology Hay Road through final closure grading. WSP also designs and implements multiple yearly LGCS construction phases to maintain continuous LFG emission and migration regulatory compliance for the existing Landfill footprint. These LGCS design phases typically include re-sizing or realigning LFG headers and subheaders to address operational requirements, adding vertical extraction wells and laterals, and leachate and condensate sump connections. WSP also designs and implements perimeter gas collection trenches adjacent to each cell liner to mitigate emissions from the slope leachate collection layers.

CQA and Construction Engineering Services: WSP provides construction engineering support and CQA services to Recology Hay Road for the periodic construction of both landfill disposal modules, LGCS expansions and other ancillary site works. Our services included: Agency plan checks of the construction documents; Solicit bids for construction, recommend award, and work with Recology’s procurement department to get contracts in place. Review construction staking and confirm the construction documents match the existing pre-construction conditions. Provide geosynthetics and earthworks inspection and laboratory services, and represent Recology as engineer-of-record during site construction.

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SOQ | Landfill Gas Services in California | Landfill Gas Services in California

ANDREW WANG, PE Andrew has provided professional LFG and LCRS engineering services to California landfill clients for over 35 years. These services include facility assessment, siting, planning, permitting, engineering, and procurement of GCCS and LCRS. He also handles construction management, quality assurance, LFG energy utilization studies, site monitoring and characterization, and system operations and maintenance. Andy provides senior technical review for other landfill environmental operations, including air and water quality regulatory compliance and remedial investigations. He has managed and prepared LFG collection system bid and construction plans and specifications for over 40 landfills. Additionally, he has designed LCRS for many landfills utilizing base containment sumps, vertical extraction wells, and perimeter dewatering trenches. KRIS JOHNSON, PG, CEG Kris is a geology practice leader responsible for conducting and managing hydrogeologic and engineering projects for landfill, mine, and industrial sites. He specializes in regulatory and water quality compliance at solid waste sites, implementing detection monitoring, evaluation monitoring, and corrective actions. His project experience encompasses evaluating LFG impacts on groundwater at multiple municipal solid waste landfills and developing perimeter LFG migration monitoring plans for active and closed landfills. Kris also manages the O&M of landfill leachate extraction systems, including installing pressure transducers to monitor leachate levels and optimizing pumping systems for leachate removal. Additionally, he oversees LFG extraction system operation, maintenance, and compliance reporting for several Northern California Landfills. during construction, construction, compliance support, leachate management, O&M for leachate collection and recovery systems, leachate treatment systems, stormwater treatment systems, groundwater treatment systems, instrumentation and controls (SCADA). HUGO VAZQUEZ Hugo has over 25 years of experience as an environmental engineer, specializing in EHS policy and procedures, remediation, landfills, transfer stations, wastewater treatment, and environmental risk and impact assessments. He has extensive experience conducting reviews and analyses of state regulations and policies regarding waste management. He has been involved in waste diversion projects in the United States and in Mexico. His expertise also encompasses O&M for GCCS, landfill capping, geomembrane installation, Constriction Quality Assurance, design, engineering support

TEAM LANDFILL GAS

Many of WSP’s California solid waste professionals have worked on the same team, for the same clients, and with the same regulators for over a decade. Thus, WSP is well-positioned to provide the professional consultant services. Our Landfill Gas project team encompasses all the expertise required to provide the following: Concise and Supportive Regulatory Communications: WSP has earned a positive reputation for professional communication and work products with compliance staff at the Bay Area Air Quality Management District (BAAQMD), the San Francisco Bay Regional Water Quality Control Board (RWQCB), and with various Bay Area counties acting as the Local Enforcement Agency. WSP’s successful experience with regulatory agencies will support continuous positive regulatory relationships for Republic Services Inc (RSI).

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Team

CIARA SHIREY Ciara has been providing professional LFG and LCRS environmental services to California landfill clients for over three years. She has supported compliance efforts for more than ten landfill facilities, primarily within the Bay Area Air Quality Management District jurisdiction. Ciara is responsible for managing field tasks, scheduling, compliance reporting, and overseeing several landfill O&M projects. Additionally, Ciara offers a range of biological services, such as natural resource management, invasive vegetation removal planning, protocol-level surveys, and pest control solutions. STEVE GIACOMINI Steve is a Sr. Field Technician with more than 30 years of experience with landfill gas O&M and compliance. Having conducted LFG O&M and compliance monitoring at numerous landfills across Northern and Central California. He has vast experience in all phases of operations, maintenance and monitoring of landfill gas extraction, leachate extraction and monitoring, Surface emissions and air compliance monitoring. He has performed LFG O&M and monitoring at several landfills with active LFG to energy facilities and understands the importance of coordinating and maintaining a cooperative working relationship with Plant operations personnel to provide consistent quality landfill gas to the plant in conjunction with meeting all regulatory compliance requirements. His expertise includes landfill gas flare and system component O&M, Monthly wellfield monitoring and balancing, leachate monitoring and extraction, LFG migration monitoring and landfill surface emissions monitoring. THOMAS STUART Thomas has a decade of experience in groundwater monitoring and operation and maintenance (O&M) of remediation facilities. At WSP, he performs LFG O&M at three landfills, optimizing gas extraction for electricity generation and flaring. His tasks include maintaining wellfield balance, conducting monthly wellfield readings and visible emissions observations, locating and fixing gas system leaks, and performing surface emissions monitoring. Thomas collaborates closely with energy plant operators and owners to ensure methane concentrations remain optimal for engine operation. Additionally, he maintains leachate pumping systems and monitors liquid levels in gas wells. TONALEA PUTZLER Tonalea is a mid-level technician with two years of experience conducting groundwater monitoring and O&M of remediation facilities. At WSP, she performs LFG O&M at two landfills, optimizing gas extraction for electricity generation and flaring. Additionally, she is responsible for compliance sampling pursuant to the National Pollutant Discharge Elimination System permit for closed mine facilities.

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We are one of the world’s top professional services firms, bringing together some of the brightest engineers, advisors and scientists from across the globe. We exist to shape communities to advance humanity. We see the world through a Future Ready ® lens, fueled by a shared commitment to making a positive impact—one project and community at a time.

CONTACT Hugo Vazquez Vice President Civil & Ground Eng, Technical Director, Environmental Engineer Hugo.Vazquez@wsp.com 1-510-768-1717

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