North Pleasant Valley Desalter Standby Production Well

City of Camarillo | Camarillo, California

Eros supported the City of Camarillo in the design, permitting, and construction of a critical standby extraction well for the North Pleasant Valley (NPV) Desalter Facility, which provides a treatment capacity of approximately 4,500 acre-feet per year. The project was developed to enhance operational reliability and maintain potable supply continuity within the Pleasant Valley Groundwater Basin.

He optimized well design parameters, including casing materials, screen intervals, and aquifer zone selection, to address variable water quality conditions characterized by elevated concentrations of chloride, sulfate, and manganese. Eros coordinated with the Fox Canyon Groundwater Management Agency (FCGMA) to ensure full compliance with the Groundwater Sustainability Plan (GSP) and basin allocation framework.

He also ensured compatibility between well design and the NPV treatment system, integrating hydraulic and geochemical considerations to support long-term performance. The project provided the City with a robust, high-quality supply source capable of meeting operational and regulatory requirements for decades to come.

Municipal Well Design, Permitting, Construction, Inspection, and Testing of Bella Vista Well No. 2 & Destruction of Bella Vista Well No. 1

Golden State Water Company | Mojave Desert Region, California

Eros supported Golden State Water Company (GSWC) in implementing their Capital Improvements Program (CIP), providing hydrogeologic and engineering oversight for the design, construction, and testing of multiple municipal supply wells, including Bella Vista Well No. 2 and the destruction of Bella Vista Well No. 1. These projects were delivered under both conventional design–bid–build and design–build models, achieving production capacities that exceeded design flow expectations while maintaining cost efficiency and regulatory compliance.

Located in or adjacent to the Mojave Desert region of southern California, the projects required comprehensive hydrogeologic assessment and adaptive design to address uncertainties in local subsurface conditions. Eros developed and executed a detailed completion plan emphasizing operational readiness and economic optimization through bundled components and integrated design strategies.

He led isolated zone testing programs to verify groundwater yield and quality prior to final screen design, allowing GSWC to assess site feasibility early in the drilling phase and avoid unnecessary costs. The verification testing confirmed high aquifer productivity and favorable water quality, leading to the successful completion of both wells, each exceeding GSWC’s expectations for performance and reliability. The destruction of Bella Vista Well No. 1 was performed using the shot perforation method, ensuring complete breach of the well casing and effective isolation of the borehole prior to grouting, in accordance with California Department of Water Resources well destruction standards.

Municipal Well Design, Permitting, Construction, Inspection, and Testing of Yeager Well No. 4

Golden State Water Company | Mojave Desert Region, California

Eros Supported Golden State Water Company (GSWC) with implementation of their Capital Improvements Program (CIP) projects starting in 2022, including multiple production wells, and continued to support GSWC with completion of well projects. Several CIP projects required drilling, construction, testing, and equipping of groundwater production wells, along with associated facilities. We supported GSWC through conventional design‐bid‐build and design‐build delivery models, and exceeded design flow expectations for all wells installed.

Delivered well projects at separate locations in or adjacent to the Mojave Desert in southern California. Based on limited design criteria, a comprehensive completion plan was developed with the objective of delivering ready‐to‐operate facilities. Components were bundled to achieve cost savings and economic efficiencies, ultimately resulting in lower overall costs for each project. An important factor was uncertainty associated with hydrogeologic conditions at multiple proposed well locations, as groundwater conditions at those sites were not fully defined.

To address this, we recommended verifying local conditions before significant resources were committed. We designed and oversaw verification of site hydrogeology through isolated zone testing (quantity and quality) during early drilling phases. Groundwater yield verification through zone testing gave GSWC the flexibility to abandon sites if necessary and avoid substantial costs. Zone testing indicated a high probability of success, and each well proved highly productive, exceeding GSWC’s needs.

Isolated zone testing also confirmed vertical productivity and water quality before final screen design. Both wells greatly exceeded expectations for production rates and water quality.

Design Services for Drilling a New Municipal Groundwater Production Well

City of Adelanto | Adelanto, California

Eros provided comprehensive hydrogeologic and engineering services for the City of Adelanto’s new municipal groundwater production well. His responsibilities encompassed well siting analysis, aquifer testing, conceptual hydrogeologic modeling, and development of construction cost estimates.

He prepared and coordinated well siting studies, wellfield testing programs, and conceptual model evaluations to guide design and optimize production potential. Eros also led permitting coordination, prepared bidding documents and technical specifications, and provided construction management and oversight throughout drilling, development, and performance testing. The project established a technically sound and cost-effective framework for expanding the City’s potable groundwater supply.

Well 30 Municipal Water Supply Project

City of Manteca | Manteca, California

Eros provided advanced hydrogeologic and engineering services to the City of Manteca for the Well 30 Water Supply Project, which included the development of a new potable production well, a 4-inch diameter transmission pipeline extending approximately 6,500 feet, and associated facilities.

His professional scope encompassed a comprehensive regulatory offset assessment, detailed well siting and hydrostratigraphic evaluation, and the design of both the production well and transmission pipeline alignment. Eros prepared complete bidding documents, technical plans, specifications, and cost estimates; coordinated permitting with multiple regulatory agencies; and provided bid-phase advisory services.

He also led full construction management, inspection, and aquifer performance testing to ensure compliance with state and local standards. The project integrated regulatory compliance, aquifer characterization, and infrastructure design to ensure a reliable, sustainable groundwater supply and long-term operational efficiency for the City of Manteca.

Well 22 Municipal Well Comprehensive Site Assessment, Permitting, Design, and Construction

City of Lakewood | Lakewood, California

Eros provided comprehensive hydrogeologic and engineering services for the City of Lakewood’s Well 22 project, encompassing site characterization, regulatory permitting, and full project design and implementation. He prepared the Preliminary Design Report (PDR) and Drinking Water Source Assessment and Protection (DWSAP) study, integrating hydrostratigraphic, geochemical, and regulatory data to inform well design and siting.

Eros developed detailed technical plans and specifications, provided bid-phase advisory support, and supervised construction, inspection, and aquifer performance testing to verify compliance with California Division of Drinking Water (DDW) and local standards. He also prepared final reporting and documentation to support project certification.

The project successfully delivered a high-capacity potable supply well designed for long-term reliability, optimized efficiency, and consistent water quality performance within the City’s groundwater production system.

Church Well 25 Municipal Supply Well

Golden State Water Company | Rancho Cordova, California

Eros provided comprehensive hydrogeologic support for the design and construction of Golden State Water Company’s Church Well 25. His scope included well siting analyses, review of subsurface data, and preparation of the Preliminary Design Report (PDR) to guide engineering and regulatory approvals.

He developed detailed technical plans and specifications, provided bid-phase advisory services, and oversaw construction management, inspection, and performance testing to ensure adherence to design intent and state standards. Eros coordinated permitting, prepared Drinking Water Source Assessment and Protection (DWSAP) documentation, and authored the Well Construction Summary report.

His responsibilities included QA/QC of all technical deliverables and the formulation of responses to client comments, ensuring regulatory compliance, design integrity, and long-term operational reliability of the new production well.

Commission 20 Municipal Well Rehabilitation & Optimization

Long Beach Utilities Department | Lang Beach, California

Eros provided hydrogeologic services for the rehabilitation of Commission Well 20 for the Long Beach Utilities Department. His work included permanent pump removal, mechanical rehabilitation via brushing and bailing, and comprehensive downhole video inspection to assess casing and screen conditions.

He directed staged redevelopment using swabbing and airlift techniques, followed by pump development, focused-intake testing, and dual-swab pumping to enhance well efficiency and restore production capacity. Eros also oversaw spinner flow surveys and conducted an analytical evaluation of the wellfield’s radius-of-influence to assess hydraulic connectivity and optimize operational performance. The rehabilitation efforts successfully extended the well’s service life and improved yield consistency under long-term operating conditions.

Well Design, Permitting, Construction, Inspection, and Testing of Well 8 and Hydrogeological Evaluation of Well 7

Phillips 66 | Los Angeles Refinery Wilmington Plant | Los Angeles, California

Eros managed the design and construction of a high-capacity, 2,500 gpm industrial supply well at the Phillips 66 Los Angeles Refinery in Wilmington, California. The well was designed to provide non-potable water for process operations and fire protection systems, supporting the refinery’s critical infrastructure resilience and operational efficiency.

His professional scope encompassed a comprehensive siting investigation, development of detailed technical plans and specifications, bid-phase advisory, and construction inspection with full documentation of field activities. Eros also conducted advanced hydrogeologic analyses addressing boundary condition representation and leaky aquifer dynamics to ensure sustained hydraulic performance and long-term reliability. The project successfully delivered a robust and efficient well system aligned with industrial performance and regulatory requirements.

Municipal Supply Well Modification

City of Corcoran | City of California

Eros conducted a detailed hydrogeologic evaluation of a municipal supply well impacted by regional land subsidence in the City of Corcoran. His work included analysis of historical pumping data, assessment of well performance decline, and feasibility evaluation of structural rehabilitation and modification alternatives.

He prepared modification plans integrating subsidence mechanics, casing deformation analyses, and long-term structural stability considerations. Eros also provided on-site construction oversight to ensure adherence to design intent and regulatory standards. The project enhanced well integrity, extended operational life, and restored production reliability for the City’s municipal water supply system.

Capital Improvement Program (CIP) Well Assessments

Golden State Water Company | Northern and Southern California

Eros provided Certified Hydrogeologist and Professional Geologist expertise to Golden State Water Company (GSWC) as part of its Capital Improvement Program (CIP). He conducted comprehensive condition assessments of municipal production wells across multiple service areas to evaluate performance, remaining useful life, and structural integrity.

His work included identification of candidate locations for new production wells with optimal yield and water quality potential, supported by hydrogeologic data synthesis and regulatory review. Eros developed strategic recommendations to guide long-term capital planning, optimize system capacity, and sustain reliable potable water supply for GSWC’s service regions.

Hydrogeological, SGMA, Beneficial Use, Groundwater and Aquifer Exemption Assessment

Confidential Client | Kern County, California

Eros provided technical and expert witness support in litigation concerning groundwater rights, aquifer exemptions, and Sustainable Groundwater Management Act (SGMA) compliance for the Panorama Vista Preserve along the Kern River. His work focused on evaluating groundwater extraction and injection activities by nearby oil-field operators to determine potential impacts on beneficial use and groundwater-dependent ecosystems (GDEs).

He assessed produced-water extraction and injection volumes, groundwater elevation trends, base of freshwater conditions, and aquifer exemption boundaries using CalGEM datasets and regional Groundwater Sustainability Plans (GSPs). Eros analyzed groundwater–surface water interactions and regulatory frameworks to determine implications for SGMA-defined beneficial uses and ecological water rights.

He developed expert opinions, prepared technical exhibits, and supported legal teams through deposition and testimony preparation. His recommendations included strategies for reallocation of treated water to meet ecological, regulatory, and public-benefit objectives within the broader SGMA compliance framework.

San Bernardino Basin Model (SBBM) Update & Steering Committee Structural Hydrogeological Assessment

San Bernardino Valley Municipal Water District | San Bernardino County, California

Eros supports the ongoing update of the San Bernardino Basin Model (SBBM), a key regional decision-support tool used by the San Bernardino Valley Municipal Water District (SBVMWD) for safe yield assessments and sustainable groundwater management planning. Working in collaboration with S.S. Papadopoulos & Associates, he provided technical review and strategic guidance as part of the project’s Steering Committee.

His role included evaluation of the model framework, hydrostratigraphic layering, calibration datasets, and boundary conditions to improve model accuracy and predictive performance. Eros also analyzed historical recharge and production simulations, identifying opportunities to enhance the model’s representation of managed recharge operations, fault-controlled groundwater flow, and inter-basin connectivity. His recommendations have informed model refinements and increased stakeholder confidence in its application for basin sustainability, recharge optimization, and long-term water resource planning.

Chino Basin Model and Basin Safe Yield Evaluation Peer Review

Chino Basin Watermaster | Rancho Cucamonga, California

Eros supports S.S. Papadopoulos & Associates in conducting an independent peer review of the Chino Valley Groundwater Model (CVM) and its application to the Chino Basin Watermaster’s safe-yield evaluations. The review addresses Board and stakeholder concerns regarding boundary conditions, recharge representation, and applied-water/return-flow assumptions used in basin management analyses.

He evaluated model calibration, hydrostratigraphic structure, and boundary condition implementation to ensure scientific defensibility and transparency. Eros also developed a framework to identify and prioritize “uncertainty hot spots,” including areas such as the Mount Rubidoux flank and the Rialto-Colton interface, where model sensitivity is highest. His recommendations support refinement of the model for improved predictive reliability and provide a roadmap for long-term basin planning, management, and regulatory compliance under the Sustainable Groundwater Management Act (SGMA).

San Fernando Valley Southern Well Fields Scientific Nested Monitoring Wells

Los Angeles Department of Water and Power | Los Angeles, California

Eros provided professional hydrogeologic consulting services in support of the Los Angeles Department of Water and Power’s (LADWP) San Fernando Groundwater Basin Remediation Project—one of the largest groundwater restoration programs in California. His responsibilities encompassed program initiation and strategic planning, detailed design of nested monitoring and high-capacity production wells, and coordination of regulatory permitting and procurement frameworks.

He evaluated alternative project delivery mechanisms and provided technical oversight throughout construction, commissioning, and system integration phases. Eros played a key role in translating complex hydrostratigraphic and contaminant plume conditions into actionable design parameters, ensuring alignment between regulatory requirements, engineering design, and long-term groundwater remediation objectives.

His contributions included structuring project closeout documentation and guiding the operational assimilation of new groundwater production and treatment infrastructure. The project’s integrated approach set a precedent for large-scale basin restoration and sustainable water supply resilience within the Los Angeles region.

Groundwater Production Wells Assessment, Well Development, Testing, and Optimization

Keyera Energy Incorporated | Glenpool, Oklahoma

Preparation of a project execution plan for development and testing of the existing groundwater production wells which included: Field methodologies, drilling rig equipment and tools, and objectives/targets for development and testing; Data collection requirements and criteria to be used during field evaluations; Site and project specific health and safety; and Definition of specific roles and responsibilities for client and all subcontractors. Provision of on-Site technical supervision which included: Supervision of the aquifer testing program for the wells; Providing recommendations, Preparation of daily field reports documenting activities conducted on-Site, recorded data, and field observations; and siting potential new groundwater production well locations for rig access. Analysis and assessment of safe yield and the serviceability of the existing wells. Providing recommendations for well operations and maintenance (O&M); and determination of the water budget.

Remedial Extraction, and Scientific Multi-Completion Monitoring Wells, Well Design, Permitting, Construction, Inspection, and Testing, & Remedial Extraction System Discharge Permitting and Compliance

Water Replenishment District of Southern California (WRD) │ Vernon, California

Eros supported the Water Replenishment District of Southern California (WRD) in one of the most technically complex perchlorate investigations in the state, conducted in collaboration with multiple regulatory agencies through the Los Angeles Forebay Groundwater Task Force. The project addressed elevated perchlorate concentrations within the Forebay aquifer system—among the highest detected statewide—occurring in deep, coarse-grained hydrostratigraphic zones hydraulically connected to the Central and West Coast Basins (CBWCB). This connectivity posed an imminent risk of plume migration into critical regional supply aquifers, with two municipal production wells already impacted downgradient of the City of Vernon.

Eros led the hydrogeologic design and oversight of an expanded triple-nested monitoring well network to refine the three-dimensional characterization of plume extent and transport pathways. He also contributed to the design and field oversight of remedy progress and extraction wells, supporting WRD’s long-term containment strategy. His work included development and calibration of conceptual and numerical groundwater flow and solute transport models, integrating data from nested wells and aquifer testing to guide remedial strategy, prioritize monitoring, and inform long-term basin management under Proposition 1 funding.

Hydrogeological Evaluation, Well Siting, Water Supply Well Design, Installation, Construction, Inspection, and Testing

Los Angeles Department of Water and Power | Los Angeles, California

LADWP completed a $300 million project including expansion and construction of the new Haskell Canyon Switching Station in Santa Clarita, California. Mr. Bilyeu has assisted LADWP with competing well siting studies, hydrogeological and water resource assessments, designing production wells for water supply, performing construction, inspection, and testing services including aquifer testing and analysis during installation of production wells for use at power facilities across Southern California for LADWP’s Power Group.

Well 37 Municipal Well Design, Construction, Testing, and Inspection

Eastern Municipal Water District | Hemet, California

Eros provided project management and advanced hydrogeologic services for Eastern Municipal Water District (EMWD) within the San Jacinto Groundwater Basin, supporting the District’s long-term groundwater supply and sustainability objectives. His responsibilities nearly spanned the full well lifecycle, from conceptual design through testing, integrating hydrogeologic data, regulatory requirements, and engineering design principles.

He provided field support for the geophysical logging, pilot-hole drilling, and multi-zone aquifer testing programs to optimize well design and maximize production efficiency. Eros also oversaw the design and installation of supplemental monitoring wells to expand EMWD’s basin monitoring network, providing essential data on aquifer performance, recharge influence, and subsurface connectivity between managed recharge facilities and planned developments. In addition, he conducted a geothermal feasibility assessment along the Claremont Fault and San Jacinto River corridor, incorporating fault structure and aquifer thermodynamics into a basin-scale conceptual framework for future renewable energy and water resource planning.

Wells 83 and 84 Aquifer Storage and Recovery Wells (ASR)

Sacramento Suburban Water District | Citrus Heights, California

Eros was responsible for QA/QC oversight throughout the development of technical specifications, design phases, and construction management for two Aquifer Storage and Recovery (ASR) wells executed under a Progressive‑Design‑Build framework. Professional contributions encompassed detailed review and validation of contractor submittals, continuous coordination through data evaluation and field implementation, and resolution of drilling complications. Localized stratified contaminant zones and severe lost‑circulation conditions were mitigated through the application of 250‑foot‑deep conductor casings in each borehole, representing an innovative adaptation to site hydrostratigraphy. The wells ultimately achieved target storage and production capacities without the need for post‑construction treatment, demonstrating both design efficacy and long‑term operational viability.Eros was responsible for QA/QC oversight throughout the development of technical specifications, design phases, and construction management for two Aquifer Storage and Recovery (ASR) wells executed under a Progressive‑Design‑Build framework. Professional contributions encompassed detailed review and validation of contractor submittals, continuous coordination through data evaluation and field implementation, and resolution of drilling complications. Localized stratified contaminant zones and severe lost‑circulation conditions were mitigated through the application of 250‑foot‑deep conductor casings in each borehole, representing an innovative adaptation to site hydrostratigraphy. The wells ultimately achieved target storage and production capacities without the need for post‑construction treatment, demonstrating both design efficacy and long‑term operational viability.

Olympic Well Field Injection & Groundwater Monitoring Program

City of Santa Monica | Santa Monica, California

Eros provided hydrogeologic expertise to the City of Santa Monica’s Olympic Well Field Restoration Program, with emphasis on regulatory compliance and aquifer sustainability. Responsibilities encompassed preparation of technical specifications, coordination of certified laboratory analyses, and design of baseline sampling protocols to satisfy regulatory monitoring requirements for groundwater injection. Collaboration with multiple consultants, the City, and agencies under a multidisciplinary team framework facilitating integrated evaluations of aquifer conditions, regulatory pathways, and treatment system performance.

Key contributions included:
Designed and implemented a rigorous baseline sampling program to characterize groundwater quality prior to initiation of injection operations.
Coordinated with accredited laboratories for comprehensive analysis of Title 22 constituents, trace metals, organic compounds, and radiological parameters.
Interpreted and validated analytical datasets to demonstrate compliance with Division of Drinking Water (DDW) and Regional Water Quality Control Board (RWQCB) permit conditions. Provided technical QA/QC oversight and ensured defensibility of submittals to regulatory agencies. Integrated findings into the City’s broader Olympic Well Field Rehabilitation and Restoration Program to support long‑term potable supply resiliency. This work enhanced Santa Monica’s capacity to restore and safeguard municipal groundwater resources while reducing dependence on imported Metropolitan Water District (MWD) supplies, advancing regional sustainability and drought‑resilience objectives.

Scientific Monitoring Well Design, Construction, Inspection, and Testing: In-Situ Solinst Waterloo Multilevel Wells, Westbay Wells, FLUTe Wells, Multi-Completion Wells, In-Situ Chemical Oxidation (ISCO) Wells, Injection Wells (i.e., Heat, Fluorescein Dye, and Beads and hydro-gel bead tracer studies), and High Resolution Aquifer Characterization in Diffused Fractured Bedrock (DFN)

Santa Susan Field Laboratory | Canoga Park, California

Eros directed technical field operations, personnel, contractual oversight, and regulatory coordination across multiple task orders under a $17 million site-wide investigation at the 2,850-acre Santa Susana Field Laboratory, an aerospace and defense research and testing facility historically operated by Rocketdyne/Boeing, NASA, and the U.S. Department of Defense. The work was performed under a multi-agency regulatory framework to support long-term groundwater and soil remediation.

He conducted high-resolution hydrogeologic characterization of diffuse fractured bedrock networks (DFNs) within the Chatsworth Formation, performing structural and statistical analyses of joints, bedding-plane shears, and multi-scale fault systems in turbidite sequences. Working collaboratively with Dr. John A. Cherry and the University of Guelph 360 team, Eros advanced DFN conceptualization and monitoring well network design, implementing innovative in-situ subsurface fault mapping and downhole geophysical logging techniques for deformation analysis. His leadership contributed to the development of pilot studies that refined DFN modeling methodologies and informed remediation strategies for one of the most technically complex environmental sites in California.

Saugus Well Field Evaluation

Santa Clarita Valley Water Agency | Santa Clarita, California

Eros served as a third-party technical expert and witness for the Santa Clarita Valley Water Agency (SCV Water), providing strategic hydrogeologic and regulatory support under the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA). He led preparation of an Engineering Evaluation/Cost Analysis (EE/CA) and supporting documentation to strengthen SCV Water’s cost recovery case against potentially responsible parties under the National Contingency Plan (NCP).

The non-time-critical removal action (NTCRA) addressed human health and environmental risks associated with perchlorate and volatile organic compounds (VOCs) detected in the Alluvial Aquifer and Saugus Formation—conditions deemed to pose an imminent and substantial endangerment to the drinking water supply for Los Angeles County residents. Eros’s analyses focused on the migration of contaminants into production wells under active pumping conditions, integrating hydrostratigraphic data, plume delineation, and aquifer hydraulics into the EE/CA framework.

He also contributed to the preparation of the Community Involvement Plan (CIP) to ensure transparent stakeholder engagement and compliance with NCP procedural requirements. His work provided SCV Water with a scientifically defensible, cost-effective remedial strategy that advanced both regulatory and legal objectives for long-term groundwater protection.

Municipal Well Evaluations, Rehabilitations, and Optimization

Elsinore Valley Municipal Water District Elsinore California │Riverside County, California

Eros supported the Elsinore Valley Municipal Water District (EVMWD) with comprehensive hydrogeologic investigations, new well design, and rehabilitation of existing wells to enhance reliability and sustainable production.

He led multi-criteria well siting analyses integrating hydrogeologic field data, groundwater resource evaluations, and regulatory compliance reviews (RWQCB, DDW, and CEQA). Eros prepared Drinking Water Source Assessment and Protection (DWSAP) capture-zone analyses and authored the Project Design Report (PDR).

For new wells, he developed engineering plans and technical specifications, directed exploratory drilling and geophysical logging, supervised final construction and testing, and validated water quality under Title 22 standards. For rehabilitation projects, he analyzed historical well performance, assessed casing integrity, and oversaw construction to restore capacity and extend service life.

His work improved EVMWD’s system reliability, operational efficiency, and compliance with state and regional groundwater management standards.

Fox Canyon Groundwater Management Agency Groundwater Sustainability Plan (GSP) Los Posas Basins Hydrogeological Conceptual Model (HCM)

Calleguas Municipal Water District | Ventura County, California

Eros served as the lead hydrogeologist and technical developer for the three-dimensional hydrostratigraphic conceptual model (HCM) of the Las Posas Basin in Ventura County, supporting the Fox Canyon Groundwater Management Agency (FCGMA) and Calleguas Municipal Water District in meeting Sustainable Groundwater Management Act (SGMA) requirements. The 66‑square‑mile basin, extending more than 3,500 feet in depth, was digitally modeled to refine understanding of groundwater–surface water interactions, aquifer geometry, and resource availability for sustainable yield and water budget estimation.

He integrated oil and gas well records, geophysical and lithologic logs, and field mapping of paleostratigraphic, lithostratigraphic, and mesoscopic structural features to construct a high‑resolution subsurface framework. Eros applied geostatistical and 3D modeling tools, including RockWorks, Leapfrog, Petra, ArcGIS, and gINT—to synthesize disparate datasets into a cohesive geologic model used to inform basin management and numerical flow modeling. His work strengthened the scientific foundation of the Las Posas Groundwater Sustainability Plan and enhanced stakeholder confidence in regional water resource decision‑making.

Hydrogeological Characterization, Well Design, Installation, Construction, and Testing Multi-Completion Monitoring Wells and Municipal Supply Well

City of Perryton | Perryton, Texas

Eros managed a $225,000 groundwater investigation, municipal well design, and wellfield expansion project for the City of Perryton to delineate the vertical and lateral migration of carbon tetrachloride (CTC) contamination through multiple aquifers within the Ogallala Aquifer system. The work was performed under Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) procedures, ensuring regulatory compliance and defensible data for remedial and infrastructure decision-making.

He supervised drilling operations using both air and mud rotary methods, designed and oversaw the construction of new municipal supply wells, and conducted aquifer testing to evaluate hydraulic properties, production capacity, and contaminant distribution. Eros also advanced qualitative field methods to map lithology and porosity as functions of quantitative Unified Soil Classification System (USCS) data, correlating findings with resistivity log interpretations. These efforts refined the site conceptual model, improved understanding of contaminant migration pathways, and supported the City’s long-term groundwater resource protection and sustainable supply development strategy.

Coachella Valley Municipal Supply Well Testing and Certification

Private Client and Riverside County | Riverside County, California

Eros conducted hydrogeologic investigations and well certification services in the Coachella Valley for the County of Riverside, supporting potable water supply and emergency fire suppression infrastructure for a major development. His responsibilities included performance testing, aquifer characterization, and analysis of transmissivity, storativity, and sustainable yield to ensure reliable groundwater production and compliance with County and state regulatory standards.

He validated the performance of on-site treatment systems and assessed the reliability of the groundwater distribution system under variable demand and seasonal conditions. Eros’s work provided the County with a comprehensive technical basis for certification, ensuring both immediate functionality and long-term operational sustainability of the water supply infrastructure.

Mission Valley Groundwater Basin Aquifer Storage and Recovery (ASR) Program Evaluation

San Diego State University | San Diego, California

Eros served as a third-party hydrogeologic expert providing independent technical evaluation and peer review for the City of San Diego’s Mission Valley Groundwater Basin ASR Program and its integration with the City’s Pure Water initiative. The project aimed to assess the feasibility of large-scale managed aquifer recharge and later provide third party expert review for the seasonal storage operations in proximity to the redevelopment of the former Qualcomm Stadium site by San Diego State University.

His role encompassed review of basin-scale hydrogeologic data, aquifer testing methodologies, and modeling assumptions to validate recharge and recovery performance under varying hydrologic and operational scenarios. Eros provided strategic recommendations to optimize wellfield placement, assess potential hydraulic connectivity and boundary conditions, and identify geochemical or operational constraints to recharge sustainability. His technical review helped the City and SDSU refine the conceptual hydrogeologic framework and guide infrastructure planning for one of the region’s most visible integrated water resource projects.

Mission Valley Groundwater Basin Aquifer Storage and Recovery (ASR) Feasibility Study

City of San Diego | San Diego, California

Eros supported the City of San Diego Public Utilities Department in evaluating the feasibility of developing the Mission Valley Groundwater Basin as a future local water supply source. His work included hydrogeologic characterization of the basin, assessment of aquifer yield potential, and evaluation of groundwater–surface water interactions along the San Diego River corridor. He assisted in developing a conceptual framework for potential brackish groundwater extraction and treatment, addressing key technical considerations such as water quality, recharge dynamics, and infrastructure compatibility.

The study provided a foundation for informed decision-making regarding sustainable groundwater development, integration with regional supply planning, and long-term resource management consistent with the City’s Groundwater Asset Protection and Development Program.

San Gabriel Canyon Production Well Evaluation and Capacity Improvements

Private Client | Azusa, California

Provided hydrogeological services for a redevelopment project repurposing the existing infrastructure and adding structures to accommodate additional well capacity in a fractured bedrock aquifer. Assessment included: camera Survey; desktop review of hydrogeological documents and background water level fluctuations; constant rate discharge test; spinner flowmeter logging; groundwater quality sampling; onsite wastewater schematic design; and conceptual potable and fire water system plans with fire flow calculations.

Monitoring Well Design, Construction, Development, and Testing

Kinder Morgan Energy Company | Colton, California

Eros managed project delivery and field operations for a $2 million Phase II RCRA Remedial Investigation (RI) at Kinder Morgan’s Colton Terminal facility, focused on delineating light non-aqueous phase liquid (LNAPL) impacts across multiple unconfined and confined alluvial aquifers in the Rialto-Colton Basin. The investigation was conducted under Resource Conservation and Recovery Act (RCRA) protocols to support corrective action planning and long-term groundwater remediation.

He directed subsurface characterization activities, including mapping of confining units and aquitards, and developed innovative qualitative field methods to correlate lithologic and porosity variations with quantitative Unified Soil Classification System (USCS) data and geophysical resistivity logs. Eros’s integrated analytical approach improved the resolution of hydrostratigraphic boundaries and LNAPL distribution modeling, informing remedial system design and performance monitoring. His work was formally recognized with a Reward and Recognition (R&R) award for exceptional technical leadership and field innovation.

Monitoring Well and FLUTe Well Construction, Inspection, Testing

National Aeronautics and Space Administration (NASA) Marshall Space Flight Center | Huntsville, Alabama

Eros supervised field operations for a multi-million-dollar Resource Conservation and Recovery Act (RCRA) Remedial Investigation (RI) at NASA’s Marshall Space Flight Center, overseeing comprehensive investigations of surficial media and groundwater systems across a karstic geologic setting. The project aimed to characterize complex hydrogeologic processes governing contaminant migration through fractured carbonate bedrock and high-permeability alluvial units.

He coordinated high-resolution hydrogeologic investigations, including surface and subsurface geophysical surveys, aquifer performance testing, groundwater quality characterization, tracer studies, and spring discharge monitoring. To refine the conceptual hydrogeologic model, the project utilized airborne thermal imagery surveys to locate artesian springs and zones of focused discharge along fracture-controlled conduits within the karst system. The integration of airborne and ground-based datasets provided a detailed understanding of groundwater flow connectivity, recharge dynamics, and discharge patterns.

Additional work included seismic and microgravity surveys and Monitored Natural Attenuation (MNA) design and evaluation. Eros directed multiple remedial pilot studies, including clay matrix fracturing and in-situ chemical oxidation using zero-valent iron, hydrogen peroxide, and potassium permanganate for BTEX reduction, as well as biological injections monitored via DNA/RNA analysis. His integrated technical approach informed remedial decision-making and advanced NASA’s environmental restoration initiatives across the site.

Groundwater Resources Assessment and Well Rehabilitation Program

CrossCreek Golf Club | Temecula, CA

Eros conducted a comprehensive, multi-scale groundwater resources assessment to evaluate sustainable irrigation supply alternatives for the CrossCreek Golf Club in Temecula, California. The project was commissioned to reduce reliance on imported water and ensure long-term irrigation self-sufficiency by integrating regional hydrogeologic frameworks with site-specific investigations.

Key contributions included:

Synthesizing regional hydrostratigraphy through the compilation and interpretation of well completion reports, lithologic logs, and groundwater production records from adjacent basins and academic sources. Quantitatively evaluating aquifer transmissivity, storativity, and sustainable yield using pumping test data, long-term groundwater level trends, and California DWR basin datasets. Characterizing irrigation-relevant water quality metrics—such as TDS, hardness, and ion-specific chemistry—to assess agronomic suitability and system compatibility. Identifying and prioritizing prospective well sites and advancing conceptual well design scenarios aligned with projected irrigation demand and site hydrogeologic constraints. Developing phased development and permitting strategies that integrated well rehabilitation, infrastructure design, and operational optimization for golf course management.

This assessment established the hydrogeologic foundation for future water-supply planning and well rehabilitation, enabling informed capital investment, regulatory compliance, and sustainable groundwater resource management for the facility.

Hydrogeological Assessment and Potable Water System Feasibility Study

Agland Renewables | Lemoore, California

Eros conducted a comprehensive hydrogeologic and water-supply assessment in support of CEQA documentation and design development for the proposed Bioconversion Facility in Kings County. The study evaluated groundwater availability, aquifer conditions within the Tulare Lake Subbasin, and compliance with SGMA and DDW regulatory requirements. Responsibilities included data review, analysis of well performance and groundwater quality, and preparation of a Groundwater Supply Assessment quantifying existing and projected demands under land-use conversion from agriculture to industrial operations.

Performed a preliminary evaluation of potable-water supply options for the facility, comparing the feasibility of establishing a small public water system with potential connection to the City of Lemoore’s municipal network. The review incorporated regulatory permitting pathways, water-quality criteria, infrastructure requirements, and City of Lemoore Urban Water Management Plan considerations. Findings provided a clear roadmap for environmental clearance, project-level design, and integration of groundwater supply planning into CEQA documentation.

Nested Monitoring Well Field Well Design, Construction, & Testing

Naval Facilities Engineering Systems Command | Naval Air Station - Outlying Landing Field (OLF) Coupeville | Whidbey Island, Washington

Eros performed a regional groundwater investigation under the United States Department of the Navy’s Comprehensive Long-Term Environmental Action—Navy (CLEAN) Program, administered by the Naval Facilities Engineering Systems Command (NAVFAC). The investigation was conducted in accordance with the Navy’s Uniform Federal Policy (UFP) +SAP guidance and focused on the delineation of per- and polyfluoroalkyl substances (PFAS, including PFOA and PFOS) in groundwater near the Outlying Landing Field (OLF) Coupeville.

He directed the installation and testing of new monitoring wells across both the perched and regional drinking water aquifers to evaluate hydrostratigraphic relationships, groundwater flow directions, and potential contaminant migration pathways. Eros oversaw the collection and interpretation of groundwater level and water quality data, confirming the presence and distribution of PFAS compounds and assessing the hydraulic influence of nearby off-base production wells. The results refined the site conceptual model, informed risk communication with local stakeholders, and supported the Navy’s adaptive management and remediation planning under federal environmental policy.

Richard A. Reynolds Groundwater Desalination Facility (Desalter Wells)

Sweetwater Authority | Chula Vista, California

Eros provided technical support for the Phase 2 expansion of the Richard A. Reynolds Groundwater Desalination Facility, a critical infrastructure project enhancing Sweetwater Authority’s potable water supply through brackish groundwater desalination. The project involved the design, permitting, and construction oversight of five new San Diego Formation desalter wells, each drilled to approximately 800 feet and designed for sustained production capacities exceeding 1,300 gallons per minute.

He oversaw preliminary well design development, preparation of detailed plans and specifications, bid-phase technical support, and adaptive final design during construction based on field conditions and aquifer performance. The design incorporated stainless steel well screens and casings to maximize efficiency and longevity under high-salinity conditions. Eros coordinated aquifer testing, step-drawdown, and constant-rate pumping evaluations that demonstrated exceptional production rates—up to 2,500 gpm, surpassing design expectations and providing the Authority with expanded operational flexibility. His technical direction supported seamless integration of the new wells into the Desalination Facility’s expanded treatment and distribution network.

Deep Nested Well Design and Construction Management Services

Castaic Lake Water Agency

Eros provided design and construction management services for the installation of two deep, triple-nested monitoring wells to support sentinel monitoring of impacted municipal supply wells within the Castaic Lake Water Agency (CLWA) service area. These monitoring wells were strategically sited to track plume migration and protect critical water supply infrastructure in the Santa Clarita Valley.

He supported site selection and permitting efforts, prepared detailed technical specifications and bid documents, and provided bid-phase consultation and full-time field oversight during construction. Boreholes were advanced to depths between 1,000 and 1,200 feet, with nested monitoring intervals between 600 and 1,100 feet, designed to isolate discrete hydrostratigraphic zones for targeted water quality assessment. Screen intervals were selected based on detailed geophysical log correlation with nearby supply and monitoring wells, ensuring high-resolution subsurface characterization. Eros’s work strengthened CLWA’s capacity for early detection and response to groundwater contamination while advancing long-term basin management objectives.

SGMA Water Management and Engineering in the Upper Santa Ana Valley Basin and Temescal Subbasin

City of Corona | Corona, California

Eros served as the technical lead for SGMA compliance and basin management services contract within the Upper Santa Ana Valley Basin and Temescal Subbasin. The project advanced the City’s long-term groundwater sustainability objectives through the integration of hydrogeologic, hydrologic, and engineering analyses under California’s Sustainable Groundwater Management Act (SGMA).

Responsibilities encompassed basin-scale hydrogeologic investigations, development of groundwater monitoring networks, and evaluation of managed aquifer recharge and conjunctive-use opportunities to enhance local supply reliability. Eros was also responsible directing modeling support for aquifer characterization, treatment feasibility assessments, and stormwater infiltration design, establishing alignment with regional sustainability strategies and the Santa Ana Watershed Project Authority’s basin management framework. Deliverables included technical memoranda, regulatory compliance documentation, and agency coordination to position the City for future SGMA milestones and grant funding opportunities.

Deep Nested Monitoring Well Design, Construction, and Testing

Simi Valley Landfill and Recycling Center | Simi Valley, California

Eros provided reporting, data evaluation, and field operations for long-term groundwater monitoring and well installation activities at the Simi Valley Landfill and Recycling Center, a Class III solid waste management facility overlying unconsolidated sediments and localized petroleum-bearing formations. The work was conducted in accordance with Waste Discharge Requirements (WDRs) and Monitoring and Reporting Programs (M&RP) adopted by the Regional Water Quality Control Board (RWQCB) under California Code of Regulations Title 27.

He oversaw well installation using sonic drilling methods to achieve high-quality lithologic recovery and minimize borehole disturbance, ensuring accurate hydrogeologic interpretation and long-term monitoring reliability. Eros managed sampling programs, reviewed analytical results, and prepared compliance reports supporting the facility’s detection monitoring program. His technical oversight contributed to regulatory compliance, data integrity, and sustainable landfill management practices.

Monitoring Well Field Construction and Testing

Honeywell | San Diego, California

Eros managed subcontractors and field operations for the installation of monitoring wells in both shallow and deep aquifers at an industrial facility in San Diego impacted by legacy chlorinated solvent releases. The work required telescoping through confining units to isolate and characterize distinct hydrostratigraphic zones across known contamination intervals.

He provided oversight of drilling operations, well design, and construction to ensure proper hydraulic separation between aquifer zones, supporting accurate groundwater sampling and contaminant delineation. Eros coordinated lithologic logging, geophysical interpretation, and well completion verification to ensure compliance with regulatory standards and project specifications. His work strengthened the site’s long-term monitoring network and informed the conceptual hydrogeologic model for future remediation planning.

Injection and Monitoring Well Field Development and Optimization

U.S. Environmental Protection Agency (EPA) & New Mexico Environmental Department | Grants, New Mexico

Eros provided hydrogeologic field support and technical reporting for the Grants Chlorinated Solvent Plume Site, encompassing a 20-acre, 100-foot-deep groundwater contamination area impacted by chlorinated solvents from historic dry-cleaning operations. The project involved installation and development of groundwater monitoring wells, deployment of vapor intrusion mitigation systems, and implementation of an in-situ thermal oxidation treatment system within identified source areas.

From 2011 to 2012, approximately 950 pounds of chlorinated solvents were successfully removed from the subsurface. Eros supported design and implementation of In-Situ Chemical Oxidation (ISCO) and Enhanced Reductive Dechlorination (ERD) technologies to address the shallow groundwater plume core and associated hotspots. He also helped design ERD bio-barriers for treatment of the plume periphery and deeper zones exceeding 20 feet. In coordination with the project team, Eros contributed to preparation of the Explanation of Significant Difference (ESD), which summarized the treatability and value engineering studies that guided the site’s remediation and long-term monitoring strategy.

In-Situ Chemical and Oxidation (ISCO) Well Construction, Inspection, and Testing

Lockheed Martin - U.S. Air Force Plant No. 6 | Atlanta, Georgia

Eros supported remedial investigation and corrective action activities at the U.S. Air Force Plant No. 6 (AFP #6), operated by Lockheed Martin in Atlanta, Georgia. His work focused on improving statistical estimates of background concentrations for inorganic compounds and organochlorine pesticides in soil, groundwater, sediment, and surface water to establish defensible cleanup criteria and regulatory benchmarks.

He conducted In-Situ Chemical Oxidation (ISCO) pilot studies using permanganate injections, overseeing field implementation, performance monitoring, and post-treatment sampling to evaluate contaminant degradation effectiveness. Eros also contributed to the facility’s long-term groundwater monitoring program, integrating hydrogeologic data with statistical trend analyses to assess remedial progress and inform site management decisions under state and federal regulatory frameworks.

Comprehensive Site-Wide Monitoring Well Network and Hydrogeologic Characterization

Kinder Morgan Energy Company - Carson, CA

Eros conducted a comprehensive site-wide hydrogeologic characterization of soil and groundwater systems at the Kinder Morgan Energy terminal in Carson, integrating quarterly monitoring data with advanced subsurface interpretation techniques. His responsibilities encompassed detailed analysis of aquifer interactions, contaminant migration pathways, and hydraulic gradients across both perched and regional aquifer systems within the Rialto–Colton Groundwater Basins.

He developed and implemented innovative field logging methodologies, including relative lithology logging, to improve stratigraphic resolution and subsurface correlation. Eros prepared high-quality technical deliverables—analytical reports, hydrogeologic figures, and three-dimensional geospatial models—derived from multi-method datasets and digitized records. His work enhanced the understanding of aquifer geometry, boundary dynamics, and contaminant transport processes, providing the technical foundation for ongoing groundwater management and remediation planning at one of Southern California’s key petroleum distribution facilities.

Monitoring Well Design and Construction

SASOL Georgia Chemicals and Vinyls | Aberdeen, MS

Managed field staff and subcontractors under RCRA RI for long term groundwater monitoring for light non-aqueous phase liquids (LNAPLS). Managing multiple surficial media investigations for VOC/SVOC/PAH, soluble/insoluble metals, Inorganics, and evaluating/reporting on groundwater monitored natural attenuation (MNA) data. Provided oversight for remedial excavations and confirmatory investigations, and reporting. Frequent on-site meeting with client. *Rewards and Recognition (R&R) for above and beyond work.

Airsparge Well Construction and Testing

Reichhold Chemicals | Gulfport, Mississippi

Eros performed groundwater monitoring and provided field oversight of remedial activities at the Reichhold Chemicals facility in Gulfport, Mississippi. His responsibilities included managing air sparging operations to enhance in-situ remediation of volatile organic compound (VOC) impacts in shallow groundwater.

He coordinated data collection, system performance evaluation, and compliance reporting to ensure the effectiveness of subsurface air injection and contaminant volatilization processes. Eros’s field management contributed to optimizing remedial system operation and achieving progress toward regulatory closure at this legacy chemical manufacturing site.