San Fernando Valley Southern Well Fields Hydrogeological Support

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.

Los Angeles Forebay Perchlorate Cleanup Project

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.

Olympic Well Field 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.

Delineation of Per- and Polyfluoroalkyl Substances (PFAS, including PFOA and PFOS) in Groundwater

Naval Facilities Engineering Systems Command - Naval Air Station - Outlying Landing Field (OLF) Coupeville - PFCs (PFA and PFO) Investigation - 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.

Hydrogeological Assessment and Dewatering System Evaluation and Design

Las Vegas Music Venue (The Sphere) - Hydrogeological Services - Las Vegas, NV

Eros conducted a detailed hydrogeologic evaluation to support the design and construction of the iconic Las Vegas Sphere entertainment venue. The project required a comprehensive understanding of shallow groundwater dynamics within complex alluvial deposits of the Las Vegas Valley, where variable permeability, perched water, and localized artesian pressures posed unique geotechnical challenges.

He oversaw the installation and performance testing of both temporary and permanent dewatering systems, integrating new aquifer testing data with historical groundwater datasets to refine site-specific hydraulic parameters. Eros analyzed drawdown responses, aquifer transmissivity, and vertical hydraulic gradients to optimize well placement and pumping design. His findings directly informed foundation engineering and construction dewatering strategies, ensuring safe, stable, and cost-effective groundwater management during one of Las Vegas’s most technically sophisticated urban developments.

Hydrogeologic Investigation to Support the Redevelopment of the Former Riverside Cement Plant

Agua Mansa Commerce Park (former Riverside Cement Plant) - Jurupa Valley, CA

Eros conducted a comprehensive hydrogeologic investigation to support the redevelopment of the former Riverside Cement Plant and limestone quarry, repurposed as the Agua Mansa Commerce Park under a California Land Reuse and Revitalization Act (CLRRA) agreement with the Department of Toxic Substances Control (DTSC). The project required integrating complex legacy industrial impacts with modern groundwater protection and redevelopment objectives.

He oversaw subsurface characterization of soil and groundwater conditions, including delineation of hexavalent chromium (Cr⁶⁺) and other trace metal impacts within the shallow and regional aquifer systems. Eros prepared soil management plans and contributed to remedial strategy development to guide excavation, dewatering, and treatment measures in coordination with DTSC and regional water quality regulators. The investigation provided the technical foundation for informed risk management and regulatory closure supporting the site’s conversion to one of the Inland Empire’s largest commercial and logistics centers.

Los Angeles River Channel Hydraulic Assessments, Water Quality Monitoring, and Digital Modeling

U.S Corps of Engineers | Los Angeles, California

Eros supported the U.S. Army Corps of Engineers in conducting hydraulic, environmental, and digital modeling evaluations for the Los Angeles River (LAR) channel, focusing on the Glendale Narrows reach, one of the few remaining soft-bottom sections of the river system. The Corps’ maintenance area included both rectangular and trapezoidal concrete-lined segments and a 6.4‑mile soft-bottom channel stabilized with grouted stone and concrete levees.

Eros led NASSCO-compliant assessments of stormwater side drains and monitored water quality compliance during channel maintenance operations to ensure adherence to federal and state discharge requirements. He also developed a comprehensive digital model and database of the LAR channel geometry, hydraulics, and conveyance features to support ongoing maintenance planning, sediment management, and habitat preservation objectives within this critical urban watershed.

Hydrogeologic Characterization and Corrective Actions for Beverage Production Facility

Diageo PLC | Decatur, Alabama

Led subsurface investigation and corrective-action activities for a former beverage production facility with a diesel and LNAPL plume in shallow alluvial deposits adjacent to the Tennessee River Corridor. Designed and implemented a comprehensive site characterization program, including soil borings, monitoring-well installation, aquifer testing, and LNAPL gauging to evaluate product transmissivity and mass-removal potential. Directed LNAPL recovery operations utilizing passive and vacuum-skimming systems, and conducted bioventing/biosparging pilot testing to accelerate aerobic biodegradation of diesel-range organics.

Interpreted hydrogeologic and geochemical data to support monitored natural attenuation (MNA) modeling and risk-based corrective-action (RBCA) closure under ADEM Administrative Code 335‑6‑15. Prepared quarterly groundwater monitoring reports, trend analyses, and final closure documentation in coordination with ADEM and corporate environmental management (Diageo/Seagram legacy sites group). Achieved regulatory closure following demonstration of declining LNAPL thickness (<0.01 ft) and stable dissolved-phase concentrations below site-specific risk thresholds.

Litigation Support & Expert Witness

Hydrogeological, SGMA, Beneficial Use, Groundwater and Aquifer Exemption, Expert Witness, and Litigation Support

Private 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.

Third‑Party Expert/Witness, National Contingency Plan Preparation, Engineering Evaluation/Cost Analysis, and Community Involvement Plan

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.

Mission Valley Aquifer Storage and Recovery (ASR) Program Hydrogeological Evaluation, Expert Peer Review, and Feasibility Study

Private Client | 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.

Remedial Facilities and Investigations

Groundwater Remedial Pilot Testing Programs, Soil, Groundwater, and Munitions Response

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.

Army Nation Guard (ARNG)/USACE NDNODS Munitions Response, Multiple States (AL, MS, AR, CO, NM, IL)

Eros performed extensive Historical Records Reviews (HRR) and munitions response evaluations under the U.S. Army National Guard (ARNG) and U.S. Army Corps of Engineers (USACE) National Defense Non-Stockpile Ordnance and Explosives Disposal System (NDNODS) program across multiple states, including Alabama, Mississippi, Arkansas, Colorado, New Mexico, and Illinois. His work supported regulatory decision-making and prioritization for Remedial Investigations/Feasibility Studies (RI/FS), Time-Critical Action Removals (TCAR), and No Further Action (NFA) determinations.

He conducted on-site visits and interviews at active and inactive ranges, reviewed archival and operational military records, and procured legacy documentation to reconstruct historical munitions use and disposal activities. Eros designed and proposed field sampling methodologies incorporating electromagnetic induction (EMI) geophysical techniques and prepared detailed field sampling and safety plans in accordance with state-specific regulatory frameworks. He analyzed and synthesized large datasets for final reporting and deliverables, directly contributing to risk-based prioritization and cleanup planning. His exemplary performance earned a Reward and Recognition (R&R) award for exceptional diligence and technical excellence.

Resource Conservation and Recovery Act (RCRA)

Soil and Groundwater Investigations, and Long-Term Monitoring

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.

National Aeronautics and Space Administration (NASA) Santa Susan Field Laboratory | Canoga Park, California

Eros supported field operations and technical investigations for NASA’s RCRA Remedial Investigation (RI) at the Santa Susana Field Laboratory, a complex aerospace and defense research site jointly managed by NASA, Rocketdyne/Boeing, and the U.S. Department of Energy. The project focused on the characterization of surficial and subsurface media to evaluate the distribution and fate of VOCs, SVOCs, PAHs, PCBs, dioxins/furans, soluble and insoluble metals, pesticides, formaldehyde, and inorganic compounds.

He oversaw high-resolution hydrogeologic and structural mapping of the fractured bedrock system within the Chatsworth Formation, integrating aerial and drone-based imagery, trenching, and mesoscopic structural mapping to delineate fault geometry and fracture networks controlling groundwater flow. Eros directed a bedrock vapor extraction study and subsurface vapor pathway assessment to support risk evaluation and remedial design. Drilling operations employed multiple techniques—including air rotary, hollow-stem auger, and rock coring—along with re-entry of legacy boreholes for data refinement.

His work also included surface-water flow mapping and documentation of building structural features to support demolition planning. Eros’s technical leadership and innovative integration of geologic, geophysical, and environmental datasets earned him a Reward and Recognition (R&R) award for outstanding performance and technical excellence.

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.

United States Air Force - Biloxi, MS

Eros supervised operations for a $5 million fixed-price, long-term groundwater monitoring and operations program conducted under a Resource Conservation and Recovery Act (RCRA) permit and the EPA Hazardous and Solid Waste Amendments (HSWA) at a major U.S. Air Force installation in Biloxi, Mississippi. The program ensured compliance with federal and state environmental regulations and supported long-term management of legacy waste sites and groundwater remediation systems.

He provided oversight for a large base-wide monitoring well network, coordinated field sampling and data validation, and managed the operation and maintenance of landfill gas emission control systems. Eros also prepared work plans, technical proposals, and regulatory reports, maintaining close communication with U.S. Air Force environmental personnel and agency representatives. His leadership ensured cost-effective program execution, regulatory compliance, and sustained protection of groundwater and air quality at the installation.

United States Air Force - Columbus, MS

Eros supervised operations for a $10 million fixed-price Remedial Investigation (RI) conducted under a Resource Conservation and Recovery Act (RCRA) permit at the Columbus Air Force Base, encompassing the entire military installation. The program involved comprehensive investigation and monitoring of surficial and subsurface media to evaluate the distribution and fate of contaminants associated with historical base operations.

He managed field teams performing multi-media investigations for VOCs, SVOCs, PAHs, soluble and insoluble metals, pesticides, PCBs, and inorganics, while overseeing the collection, evaluation, and reporting of Monitored Natural Attenuation (MNA) data for multiple solvent plumes. Eros directed the design and installation of a base-wide groundwater monitoring network across multiple aquifers using both single- and multi-screen wells, as well as the design and construction of horizontal extraction and injection wells to optimize plume capture and remediation efficiency.

In addition to technical oversight, Eros developed ArcGIS-based field data collection and mapping methodologies to enhance spatial analysis and decision support in real time. His work resulted in improved understanding of contaminant transport pathways, plume stability, and hydrostratigraphic connectivity across the installation, supporting long-term environmental management and regulatory compliance.

SASOL Georgia Chemicals and Vinyls, Aberdeen, MS

Eros managed field staff and subcontractors under a multi-year RCRA Remedial Investigation (RI) program focused on long-term groundwater monitoring and light non-aqueous phase liquid (LNAPL) delineation. Directed multiple surficial and subsurface investigations targeting VOCs, SVOCs, PAHs, soluble and insoluble metals, and inorganics. Evaluated monitored natural attenuation (MNA) trends and developed performance metrics to support regulatory closure strategies. Oversaw remedial excavations, confirmatory sampling, and validation of cleanup effectiveness.

Coordinated closely with regulatory agencies and client representatives, leading weekly site meetings and ensuring compliance with RCRA and state environmental regulations. Work included development of innovative groundwater sampling techniques and quality-assurance procedures to improve data reproducibility. Received multiple Rewards and Recognition (R&R) commendations for exceptional performance and project leadership.

Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA)

Superfund - Soil, Groundwater, and Geophysical Investigations

Former Atlantic Fleet Weapons Training Area in Vieques

The former Atlantic Fleet Weapons Training Area in Vieques, Puerto Rico, served as the Navy’s training range for ensuring combat readiness of U.S. Atlantic Fleet Forces and for NATO operations from the 1940s until 2003. During that time more than 300,000 munitions were fired during military training operations. Live-fire training on Vieques ceased in 2001. Periodic training with concrete-filled bombs and blank bullets continued until 2003, when all Navy training ended.

Executed geophysical site investigations of classification of munitions (UXO) using advanced electromagnetic induction (EMI) methods as a part of ongoing CERCLA NPL investigation. Collecting geophysical data across majority of the island, and assembling sub-meter global positioning systems, base station systems, EMI equipment and computer systems, geophysical prove out areas, necessary network arrays, performing calculations, managing database systems, and producing high resolution subsurface maps with geophysical data in geospatial modeling software such as Oasis Montaj, and Surfer. 

Naval Facilities Engineering Systems Command (NAVFAC) - Navy Base San Diego, San Diego, CA

Eros served as Field Quality Manager for a CERCLA remedial investigation task order at Naval Base San Diego, providing high-resolution surficial and subsurface delineation of volatile and semi-volatile organic compounds (VOC/SVOC/PAH), total petroleum hydrocarbons (TPH), organochlorine pesticides (OCP), polychlorinated biphenyls (PCBs), soluble and insoluble metals, and dioxins/furans. The project focused on assessing contaminant fate and transport in complex saline tidal aquifer environments.

He supervised field crews and ensured technical quality and regulatory compliance through all phases of well installation, development, and testing using hollow-stem auger methods. Eros deployed pressure transducers and performed slug testing to characterize aquifer behavior under tidal influence, managing real-time data correction and analysis. He produced GIS-based maps and field figures to support adaptive decision-making and rapid response to unexpected subsurface conditions. His performance was recognized with a Reward and Recognition (R&R) award for exceptional leadership, data integrity, and field problem-solving in a high-stakes Navy environmental program.

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.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.

Naval Facilities Engineering Systems Command - Naval Base Point Loma - San Diego, CA

Eros supervised multidisciplinary teams, contracts, and technical reporting for two multi-million-dollar Preliminary Assessment (PA) and Remedial Investigation/Feasibility Study (RI/FS) projects at Naval Base Point Loma. The work characterized the nature and extent of CERCLA releases associated with buried debris and historical waste disposal, forming the technical basis for remedial design and regulatory decision-making.

He provided hydrogeologic oversight of trenching and subsurface investigations, including mapping and structural analysis of landslide and beach terrace deposits to delineate deformed Cretaceous-aged stratigraphic units and colluvial materials. Eros integrated hydrostratigraphic, chemical, and structural data into Human Health Risk Assessment (HHRA) and Ecological Risk Assessment (ERA) frameworks, supporting the evaluation and optimization of remedial alternatives in compliance with Navy, EPA, and state environmental regulations.

Naval Facilities Engineering Systems Command - Naval Air Facility - El Centro, CA

Eros contributed to the Remedial Investigation (RI) of former small arms, turret, and skeet ranges at Naval Air Facility El Centro under the Military Munitions Response Program (MMRP) and the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA). The project addressed legacy munitions impacts and potential contaminants of concern associated with historic military training operations.

He supported site characterization, geospatial data integration, and field verification activities to evaluate soil and groundwater quality and delineate potential exposure pathways. The investigation was conducted under the regulatory oversight of the California Department of Toxic Substances Control (DTSC), with coordination among the Colorado River Basin Regional Water Quality Control Board, the U.S. Fish and Wildlife Service, and the California Department of Fish and Wildlife. Eros’s work contributed to the development of defensible remedial strategies balancing human health protection, environmental stewardship, and continued military readiness.

Tinker Air Force Base, Oklahoma City, OK

Eros led the development of a digital three-dimensional hydrogeologic conceptual model (HCM) for Tinker Air Force Base, one of the U.S. Air Force’s largest active installations with complex subsurface conditions and legacy contaminant plumes. The model integrated multiple aquifer systems, saturated zones, aquifer test datasets, geophysical interpretations, and groundwater surface and chemistry data to support future quantitative groundwater flow and contaminant transport modeling.

The 3D digital HCM served as a foundational decision-support tool for evaluating contaminant migration pathways, refining site conceptualization, and prioritizing remedial investigation areas under CERCLA oversight. Eros presented key findings at the Battelle Conference, emphasizing data integration methods, uncertainty reduction techniques, and the model’s role in advancing adaptive groundwater management and remediation planning across the installation.

EPA/New Mexico Environmental Department-Grants Chlorinated Solvent Plume Superfund - Grants, NM

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.

Tar Creek Superfund Site – Ottawa County, Oklahoma

Eros provided hydrogeologic and environmental field support at one of the largest and most complex Superfund sites in the United States, the Tar Creek Site in Ottawa County, Oklahoma. His work focused on the characterization and remediation of groundwater and surface-water systems impacted by historical lead and zinc mining. Responsibilities included drilling oversight, installation and development of multi-depth monitoring wells, aquifer testing, and mapping of hydraulic gradients within fractured carbonate and sulfide-bearing formations. He performed sampling and analysis to delineate metal contamination pathways, and supported the design and implementation of passive and active treatment systems for acid mine drainage.

Eros also contributed to groundwater–surface water interaction studies in coordination with the U.S. EPA, U.S. Geological Survey (USGS), and Oklahoma Department of Environmental Quality (ODEQ), integrating geophysical data, potentiometric mapping, and seep/spring flow measurements to refine conceptual models of contaminant transport. His work supported remediation strategy optimization and long-term monitoring plans for groundwater restoration and ecological recovery within the Tar Creek watershed.

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

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.