Dave Colvin, P.G.

Salt River Project – Gila River Basin Adjudication, Arizona — Provides groundwater analysis and litigation support for water rights adjudication proceedings involving the Verde River, San Pedro River, and other adjudication basins (Maricopa Superior Court consolidated Cases W-1, W-2, W-3, and W-4). Technical responsibilities include subflow depletion analysis, assessment of groundwater development impacts on river systems and springs, preparation of expert technical reports, and support for settlement negotiations. Participates in multistakeholder, collaborative technical committees guiding development, calibration, and use of groundwater models. Key assignments include the Verde River Subflow Zone Delineation proceedings and evaluation of groundwater pumping impacts associated with the Big Chino Water Ranch and San Pedro Basin water rights administration.

Surface Water Coalition, Idaho — Provides technical leadership and litigation support for water management and water rights administration within the Eastern Snake Plain Aquifer (ESPA). Performs groundwater and surface water interaction analyses, water rights impact assessments, groundwater modeling review, and hydrologic evaluations supporting protection of senior surface water rights and streamflow. Serves on the Eastern Snake Plain Hydrologic Modeling Committee, providing technical oversight of MODFLOW modeling used in conjunctive management and water rights administration. Represents the Surface Water Coalition on technical working groups responsible for implementation and adaptation of the Surface Water Coalition and Idaho Ground Water Appropriators settlement agreement, including evaluation of hydrologic conditions, pumping reductions, consumptive use, managed aquifer recharge, and adaptive groundwater management strategies. Contributes to technical analyses, expert reports, settlement negotiations, and administrative proceedings involving groundwater management, water delivery, and aquifer sustainability throughout the ESPA.

Rangen, Inc., Idaho — Provided hydrogeologic analysis and expert support for water rights administration and conjunctive management proceedings involving the ESPA. Evaluated groundwater pumping impacts on spring flows supporting Rangen’s aquaculture operations, performed groundwater and surface water interaction analyses, and supported the application of regional groundwater models in water delivery and permitting decisions. Contributed technical reports, settlement negotiations, and administrative proceedings related to Water Right Permit No. 36-17011 and Water Delivery Call Case No. CM-DC-2011-004, involving protection of senior spring water rights from groundwater pumping impacts.

Underground Water Rights and Plan for Augmentation, Town of Erie, Colorado — Provided hydrogeologic analysis and litigation support for Erie’s application for underground water rights and plan for augmentation. Evaluated aquifer characteristics, groundwater–surface water interactions, recharge and recovery operations, and water rights administration considerations associated with underground storage projects. Prepared technical analyses and expert reports, supported settlement negotiations, and contributed to successful advancement of the application through Colorado Division 1 Water Court proceedings (Case Nos. 2019CW3063 and 2019CW3064).

Prairie Waters Project, City of Aurora, Colorado — Provided groundwater modeling and hydrogeologic support for Aurora’s Prairie Waters Project water rights proceedings (Colorado Division 1 Case No. 2006CW104). Led development and calibration of a regional MODFLOW groundwater model using UCODE parallel-processing techniques to evaluate stream-aquifer interactions and project impacts. Prepared technical analyses, expert and rebuttal reports, exhibits, and settlement support materials used during negotiations and litigation. Contributed groundwater evaluations supporting the successful adjudication and implementation of one of Colorado’s largest indirect potable reuse and riverbank filtration projects.

Kenosha Ponds Change of Use and Plan for Augmentation, Boulder County Parks and Open Space, Colorado — Provided hydrogeologic analysis and litigation support for Boulder County’s application for a change of use and plan for augmentation associated with the Kenosha Ponds Open Space (Colorado Division 1 Case No. 2010CW320). Evaluated groundwater–surface water interactions, recharge dynamics, and stream depletion effects related to augmentation pond operations. Prepared technical analyses and expert support materials, contributed to settlement negotiations, and authored reports supporting adjudication of water rights and augmentation operations.

Stewart No. 1 Ditch Company – Pitkin County Board of County Commissioners v. Brothers, et al. (Pitkin County Case No. 2014CV30084), Colorado — Provided hydrogeologic analysis and expert support in a civil litigation involving alleged roadway damages associated with ditch operations. Evaluated groundwater flow conditions, seepage mechanisms, and hydrologic relationships between ditch infrastructure and surrounding properties. Prepared technical analyses and reports, supported settlement negotiations, and contributed expert opinions regarding the causes and extent of water-related impacts.

In-Play Golf, Inc. – Helen Hawkins et al. v. Vista Ridge Development Corporation, et al. (Weld County Case No. 12CV727), Colorado — Provided technical and litigation support for a civil case involving alleged property damages related to golf course irrigation and groundwater conditions. Conducted hydrogeologic evaluations, prepared expert and rebuttal reports, supported settlement negotiations, and assisted counsel in assessing causation and potential hydrologic impacts.

City of Aurora – Horizontal Well Project; Weld County, Colorado — Led feasibility evaluation, design, and implementation planning for radial collector wells supporting Aurora’s Prairie Waters System. Directed hydrogeophysical investigations, exploratory drilling, aquifer testing, and groundwater modeling to optimize water supply yield while preserving riverbank filtration water quality. Led final design, permitting, construction support, and system testing, guiding adaptable system operations that can increase yield during drought demands.

Riverence Holdings LLC – Snake River Spring Supply Support, Idaho — Project manager and lead hydrogeologist supporting multiple fish hatcheries throughout Idaho’s Magic Valley. Provides water supply planning and hydrogeologic analysis for spring-fed aquaculture operations, with a focus on evaluating the impacts of upgradient groundwater pumping and aquifer recharge on water rights, water quality, and long-term supply reliability.

Town of Castle Rock – Groundwater Support; Douglas County, Colorado — Project manager providing comprehensive groundwater planning, development, and regulatory support for municipal water supply and storage projects. Key responsibilities and projects include:

• Denver Basin Well Development, Testing, and ASR: Led planning, permitting, and implementation support for Denver Basin ASR and groundwater supply projects. Responsibilities included ASR permitting and regulatory coordination, bid and procurement support, contractor management, construction oversight, well and pumping system design, aquifer testing, and groundwater regulatory compliance.
• Alluvial Well Field Expansion and Rehabilitation: Served as project manager for multiple projects to restore and enhance production from alluvial well fields affected by biofouling and declining performance. Directed construction and testing of six horizontal directional drilled (HDD) collector wells designed to improve groundwater yield, operational performance, and long-term sustainability of municipal water supplies.

Aurora Prairie Waters Project – North Campus; Weld County, Colorado — Project hydrogeologist and technical lead supporting development of the City of Aurora’s Prairie Waters Project along the South Platte River. Served as the primary liaison among a multiconsultant, multidisciplinary project team and provided technical leadership during planning, design, construction, testing, and startup phases of the project. Led and supported field investigations and construction activities, including drilling oversight, production well construction, pump and motor installation, aquifer testing, startup and performance testing, well field optimization, and geotechnical investigations. Directed the design, construction, and operation of alluvial aquifer recharge and riverbank filtration pilot facilities, including development and implementation of comprehensive testing programs. Designed and managed tracer studies to evaluate groundwater flow paths, travel times, recharge effectiveness, and stream-aquifer interactions critical to project performance and water rights considerations. Provided groundwater modeling support through development and calibration of a regional MODFLOW model used in Colorado Water Division 1 Case No. 2006CW104.

Eagle River Water and Sanitation District and Upper Eagle Regional Water Authority – Groundwater Support; Eagle County, Colorado — Project manager and lead hydrogeologist providing technical, regulatory, and operational support for alluvial well field development and management. Key projects included:

• Groundwater Under the Direct Influence of Surface Water (GWUDI) Evaluation: Provided regulatory support, groundwater modeling, and operational monitoring for alluvial well fields to support Colorado Department of Public Health and Environment (CDPHE) GWUDI evaluations and compliance requirements.
• Lake Creek Well Field Planning: Managed hydrogeologic investigations and water supply planning efforts, including groundwater modeling, production well drilling, aquifer testing, source water quality characterization, and regulatory permitting. Coordinated approvals with Eagle County (1041 Permit), CDPHE, and the Colorado Division of Water Resources (DWR).
• Well Field Maintenance and Rehabilitation: Directed troubleshooting, rehabilitation, and performance restoration of municipal wells experiencing operational and water quality challenges. Managed investigations and corrective actions related to pump failures, casing integrity issues, reduced well yields, and groundwater quality concerns to maintain reliable water supply operations.

City of Burkburnett, Texas – Alluvial Well Field Evaluation; Wichita County, Texas — Project manager and groundwater lead for evaluation of underperforming well fields near the Red River. Wells ranged from 3–50 years old with a variety of issues causing low yields. Project tasks included well operational data integration, analysis, and development of alternatives to improve well yields.

Boulder Valley School District – Douglass Elementary Non-Tributary Determination; Boulder County, Colorado — Project manager for a nontributary well application in the Boulder Complex Area of the Denver Basin Aquifers. Provided aquifer characterization and regulatory support leading to a nontributary determination and well permit approval.

City of San Marcos, Texas – Well Performance Investigation and Replacement Plan; Hays County, Texas — Project manager and groundwater lead for investigation into reduced yield problems for a well in the Edwards Aquifer. Well construction and operational data were analyzed to test viability of rehabilitation or equipment replacement. Provided ultimate solution of siting a replacement well in a more productive aquifer area.

Groundwater Relief – Kutupalong Refugee Camp Groundwater Supplies; Cox’s Bazaar, Bangladesh — Volunteer hydrogeologist providing well testing and water quality support to field geologists. The project is developing emergency water supplies for nearly 1 million Rohingya refugees who have fled religious persecution in Myanmar.

ASR Feasibility Evaluation and Pilot Testing, City of Northglenn, Colorado — Lead hydrogeologist and project manager for an ASR feasibility assessment and pilot testing program. Responsibilities include hydrogeologic and water quality evaluations, ASR feasibility analyses, pilot system design, test planning, and regulatory permitting. Leading coordination with DWR and EPA Underground Injection Control (UIC) program to support project implementation. The project is designed to demonstrate underground storage of the City’s fully consumable water rights, increasing operational flexibility and preserving surface reservoir capacity for other water supplies. If pilot testing confirms compatible recovery water quality and system performance, the facility will be transitioned into permanent infrastructure as the initial phase of a larger ASR program.

Box Elder Basin ASR Feasibility Investigation and Pilot Testing, City of Aurora, Colorado — Project manager and lead hydrogeologist for a feasibility investigation evaluating aquifer recharge and underground water storage opportunities within the Box Elder alluvial aquifer at Aurora’s Center for Renewable Energy. Led hydrogeologic characterization efforts, including hydrogeophysical surveys, exploratory drilling, test pit investigations, and infiltration testing, which demonstrated the viability of aquifer recharge as an innovative water storage solution. Responsibilities included recharge source water characterization, water rights and permitting strategy, water quality evaluations, groundwater modeling, and pilot recharge system design. The project supports development of a sustainable ASR program to enhance water supply reliability and operational flexibility through managed aquifer recharge and storage.

Lost Creek Underground Storage Pilot Project; Lost Creek Designated Basin, City of Aurora and Town of Castle Rock, Colorado — Project manager and lead hydrogeologist for aquifer characterization and recharge feasibility evaluation supporting an underground water storage pilot project. Secured grant funding and led stakeholder coordination, project planning, and implementation efforts among multiple agencies and project partners. Managed field investigations and hydrogeologic analyses to assess aquifer suitability for managed recharge and storage. The project identified critical aquifer storage characteristics and field assessment methods not captured in previous desktop evaluations, providing key insights to reduce project uncertainty and improve future recharge system design and performance.

Terry Ranch ASR Feasibility Evaluation, City of Greeley, Colorado — Senior technical advisor for a program evaluating the feasibility of new and existing ASR projects in multiple bedrock aquifers. Provided technical leadership on hydrogeologic characterization, water quality assessments, aquifer performance evaluation, well construction and testing reviews, project planning, and regulatory strategy. Advised clients on ASR permitting requirements and stakeholder coordination, including successfully negotiating EPA UIC Rule Authorization in less than 2 months, significantly accelerating project implementation timelines.

Colorado Water Conservation Board - HB16-1256 South Platte Storage Study, Colorado — Lead hydrogeologist responsible for evaluating managed aquifer recharge and underground water storage opportunities within the Lower South Platte alluvial aquifer. Conducted hydrogeologic assessments of potential storage sites, including aquifer characterization, storage feasibility evaluations, conceptual facility design, and planning-level cost estimates. Compared underground storage alternatives with traditional surface storage options to support statewide water supply planning and development of cost-effective, flexible storage strategies.

City of Aurora – Prairie Waters North Campus Master Plan, Adams and Weld Counties, Colorad — Lead hydrogeologist for the 20-year master planning effort supporting an approximately 20 MGD expansion of Aurora Water’s Prairie Waters Project North Campus. Provided hydrogeologic and water resource planning expertise for expansion of key infrastructure, including riverbank filtration well fields, transmission pipelines, and storage reservoirs. Led facility operations planning and supported long-range water resource planning, gap analyses, capacity assessments, and capital improvement planning to ensure reliable, cost-effective expansion of the Prairie Waters system and future water supply resiliency.

Water Supply Planning Support, Town of Erie, Colorado — Lead hydrogeologist and project manager providing technical and strategic groundwater support for municipal water supply planning and development. Responsibilities included aquifer characterization, water quality investigations, ASR feasibility evaluations, water rights assessments, and long-term supply planning. Prepared and secured project funding through Colorado Water Conservation Board and Colorado Department of Local Affairs grant applications. Led due diligence evaluations and retrofit design for an existing horizontal well being incorporated into the Town’s expanding water supply portfolio. Managed feasibility investigations, alternatives analyses, water rights evaluations, design, procurement, construction oversight, and performance testing for a 1,000-ft HDD riverbank filtration well, enhancing supply reliability and operational flexibility through innovative groundwater development.

Dominion Water and Sanitation District – Groundwater Support, Douglas County, Colorado — Lead hydrogeologist providing technical leadership and groundwater resource planning support for Denver Basin and South Platte alluvial aquifer water supplies. Responsibilities include water rights evaluations, water quality assessments, groundwater supply and well field yield analyses, and long-range water resource planning. Providing hydrogeologic oversight and contractor management for Denver Basin groundwater development projects, including well siting, design, drilling, construction, aquifer testing, groundwater characterization, and water quality sampling. Additional services include regional groundwater management planning, technical documentation and expert support for county hearings, coordination with local water providers and regulatory agencies, and due diligence evaluations for groundwater acquisitions and water supply transactions.

Colorado Haiti Project (Volunteer Position), Petit Trou de Nippes, Haiti — As a technical advisor, provided pro bono support for groundwater development, management, and resource protection in a rural, underserved region of Haiti. Advised local stakeholders on sustainable groundwater supply development, source protection, and long-term resource management strategies to improve access to reliable drinking water and enhance community resilience.

Water For People Groundwater Management Project (Volunteer Position); San Pedro Sula, Honduras — As a technical advisor, supported development of a participatory groundwater management framework for an overutilized alluvial aquifer in northern Honduras. Assisted in preparing the project scope of work and technical approach for stakeholder-driven groundwater planning focused on aquifer restoration, sustainable resource management, and long-term protection of critical water supplies in a developing region.

Texas Water Development Board – Statewide Subsidence Risk Evaluation, Texas — Technical advisor for a statewide assessment of land subsidence risk associated with groundwater pumping across Texas major and minor aquifers. Supported integration of well lithology data with groundwater model projections of future water-level declines to identify areas susceptible to aquifer compaction and subsidence. Contributed to development of a statewide risk map and prioritized evaluation framework, along with recommendations for monitoring, investigation, and mitigation in high-risk areas. The project provided critical information to support statewide water resource planning and local groundwater management decisions.

Neighborhood Scale Dewatering Systems and Water Rights, Colorado — Project manager for a nontributary groundwater determination and well permitting effort within the Boulder Complex Area of the Denver Basin aquifers. Conducted aquifer characterization, hydrogeologic evaluations, and regulatory analyses to support a nontributary designation. Provided coordination with regulatory agencies, resulting in successful permit approval and development of a reliable groundwater supply for the project.

Salt River Project – Cooperative Agreement No. 1, Big Chino Sub-Basin, Arizona — Lead hydrogeologist providing technical analysis of groundwater management impacts on spring flows and groundwater resources associated with the Upper Verde River. Serves as a specialized technical advisor overseeing groundwater modeling, monitoring programs, and hydrogeologic investigations conducted by a multistakeholder group. Provides independent scientific review and strategic guidance to support development of science-based solutions to complex water rights and groundwater management challenges affecting the Verde River watershed.

Salt River Project – ADWR San Pedro Modeling Committee Member, Arizona — Technical representative and hydrogeologist serving on a multistakeholder committee responsible for development of a basin-scale MODFLOW groundwater model to evaluate subflow depletion and groundwater–surface water interactions within the San Pedro Basin. Provides technical review and guidance on conceptual hydrogeologic models, aquifer framework development, hydraulic properties, model boundary conditions, calibration, and model performance. Supports the development of a scientifically defensible modeling platform to inform water management, regulatory decisions, and water rights administration.

Eastern Snake Plain Hydrologic Modeling Committee, Idaho — Technical committee member and hydrogeologist participating on the Eastern Snake Hydrologic Modeling Committee, a collaborative group of hydrologists and modelers from state and federal agencies, academia, and private industry responsible for guiding development and application of the ESPA groundwater model. Contributes technical review and peer evaluation of hydrogeologic conceptual models, groundwater modeling methods, aquifer characterization, recharge and discharge analyses, and groundwater-surface water interaction assessments. Provides expertise to improve scientific understanding of the ESPA and support defensible water management decisions, aquifer recharge programs, water rights administration, and long-term water resource planning throughout the Eastern Snake River Plain.

Aurora Prairie Waters Project – North Campus, Weld County, Colorado — Designed and managed tracer studies to evaluate groundwater flow paths, travel times, recharge effectiveness, and stream–aquifer interactions critical to project performance and water rights considerations. Provided groundwater modeling support through development and calibration of a regional MODFLOW model used in Colorado Water Division 1 Case No. 2006CW104. Applied parallel-processing calibration techniques using UCODE to improve model performance and predictive capability.

City of Phoenix – ASR Tracer Test Design, Maricopa County, Arizona — Groundwater modeling specialist supporting the Northeast Phoenix Reclaimed Water Recharge and Recovery Study through development and application of MT3D groundwater transport models. Performed aquifer characterization, travel-time analyses, and tracer test design to evaluate the feasibility of ASR and indirect potable reuse. Modeling results supported development of a recharge and recovery system intended to create a new potable water supply source, expand nonpotable water availability, and help mitigate groundwater-related land subsidence.

Salt River Project – New River Agua Fria Underground Storage Project, Phoenix, Arizona — Hydrogeologist and groundwater modeler supporting optimization and expansion of an existing managed aquifer recharge facility. Evaluated operational performance data and adapted an existing MODFLOW groundwater model to assess facility operations, optimize recharge performance, and evaluate the feasibility of in-channel recharge expansion alternatives.

Well Field Siting and Design, Wink County, Texas — Technical advisor for development of groundwater supplies within the Pecos Valley Alluvium and Upper Dockum Aquifer. Provided project planning, aquifer characterization, hydrogeologic evaluations, and geologic modeling to support well field siting, supply development, and long-term groundwater resource management.

Groundwater Supply and Subsidence Analysis, Arizona — Lead hydrogeologist and groundwater modeler responsible for developing regional MODFLOW groundwater flow and subsidence models to evaluate well field production capabilities and land subsidence resulting from groundwater pumping. Conducted statewide evaluations of subsidence-related empirical relationships and prediction methods, aquifer characterization, 3-dimensional geologic framework development, groundwater flow modeling, and predictive uncertainty analyses using PEST. Developed coupled groundwater flow and subsidence models to support water supply planning, infrastructure protection, and sustainable groundwater management.

Oilfield Produced Water Infiltration Modeling, San Louis Obispo County, California — Lead groundwater modeler for development of an engineering-scale MODFLOW-SURFACT model supporting design of a groundwater infiltration system capable of recharging approximately 13 acre-ft/day across a 200-acre alluvial site. Performed model calibration using PEST in a parallel-processing environment and incorporated 50 alternative geologic conceptual models to evaluate predictive uncertainty and system performance under varying hydrogeologic conditions. Results were used to support facility design, operational planning, and regulatory evaluation.

U.S. Army Corps of Engineers – Groundwater System Design and Optimization, Baghdad, Iraq — Groundwater modeling specialist supporting a U.S. Agency for International Development (USAID) infrastructure project in Baghdad, Iraq. Developed and applied a numerical groundwater flow model to optimize municipal water supply well locations and pumping strategies for the East End Barracks development. Project objectives included maximizing groundwater production while minimizing differential land subsidence impacts on newly constructed infrastructure.

Industrial Groundwater Contamination Sites, Various Locations — Groundwater modeler and hydrogeologist supporting investigation and remediation of contaminated groundwater sites. Developed and applied MODFLOW groundwater models to evaluate aquifer conditions, predict capture zones, and optimize extraction well design and pumping strategies for groundwater remediation systems. Provided technical analyses used to improve remediation effectiveness and support regulatory compliance.

City of Scottsbluff – Well Field Uranium Investigation and Monitoring, Scotts Bluff County, Nebraska — Technical advisor for a groundwater quality investigation focused on reducing naturally occurring uranium concentrations in the City of Scottsbluff’s alluvial groundwater supply. Provided hydrogeologic analysis, aquifer characterization, and evaluation of groundwater flow and geochemical conditions influencing uranium occurrence and transport. Analyzed long-term monitoring data to assess spatial and temporal water quality trends, support management decisions, and identify strategies for maintaining regulatory compliance and protecting municipal water supply reliability.

ASARCO - California Gulch Superfund Site, Leadville, Colorado — Environmental scientist and hydrogeologist supporting investigation, remediation, and long-term monitoring activities at one of the nation’s largest mining-related Superfund sites. Conducted environmental sampling and data analysis for the Kids First Program, helping identify and mitigate sources of lead exposure in residential areas. Performed statistical analyses and prepared technical reports evaluating program effectiveness. Designed and implemented soil sampling programs to delineate the extent of metals contamination at the Arkansas Valley Smelter Operable Unit. Provided hydrogeologic and geochemical support for characterization of the Apache Tailings Site and implemented surface water and groundwater monitoring programs to evaluate remedial action performance. Additional responsibilities included synoptic streamflow measurements, surface water quality investigations, and analysis of groundwater–surface water interactions affecting site remediation and restoration efforts.

ASARCO - Omaha Lead Site, Omaha, Nebraska — Environmental scientist supporting development of a community-based lead exposure assessment program. Assisted with environmental investigations, data evaluation, and identification of residential sources of lead exposure to support public health protection and remediation planning.

Colorado Department of Public Health and Environment – Summitville Superfund Site, Summitville, Colorado — Environmental scientist and hydrogeologist supporting long-term monitoring and management of mine waste impacts within the Alamosa River watershed. Responsibilities included abandoned mine hydrology and geochemistry investigations, environmental sampling and monitoring, mine facility inspections, data management, and technical analyses. Contributed to ongoing efforts to assess, monitor, and reduce the impacts of historical mining activities on surface water and groundwater resources.

Various Mines – Groundwater Modeling and Analysis, Basin and Range Province, Nevada — Groundwater modeler and hydrogeologist providing technical support for mine water management, permitting, and regulatory compliance. Developed MODFLOW groundwater flow models and comprehensive water balance analyses to evaluate groundwater and surface water resources associated with mining operations. Work included stream gain-loss assessments, point-flow surface water modeling, groundwater underflow evaluations, pumping inventories and estimates, and development of detailed site water budgets to support operational and regulatory decision-making.

Mine Waste and Tailings Pile Sites, Various Locations — Hydrogeologist and environmental modeler evaluating remedial alternatives for mine waste and tailings management facilities. Applied the Hydrologic Evaluation of Landfill Performance (HELP) model to assess infiltration, runoff, leachate generation, and long-term repository performance. Supported engineering design and remedy selection by quantifying hydrologic performance and regulatory compliance of proposed containment and remediation alternatives.

EPA - Vasquez Boulevard and Interstate 70 Superfund Site, Denver, Colorado — Environmental scientist responsible for designing, directing, and implementing environmental sampling programs to identify sources of lead and arsenic exposure in residential communities impacted by historical smelter-related contamination. Conducted soil sampling, data analysis, and exposure pathway evaluations to support risk assessment, remediation planning, and protection of public health, with a particular focus on reducing childhood exposure to heavy metals.

Former Underground Storage Tank, Colorado Springs, Colorado — Project hydrogeologist and technical lead for characterization, monitoring, and remediation of petroleum hydrocarbon contamination associated with a former underground storage tank facility. Managed groundwater and soil investigations, quarterly monitoring and reporting programs, and regulatory compliance activities. Developed and implemented an in situ chemical oxidation remediation program to reduce contaminant concentrations and support site closure objectives.

Former Underground Storage Tank, Arvada, Colorado — Project manager and technical lead for investigation and remediation of petroleum-impacted soil and groundwater at a former service station. Directed client and regulatory coordination, site characterization, contaminant delineation, and remedial design activities. Performed vapor extraction and remediation modeling using VENT2D, conducted respirometry testing to quantify vadose zone biodegradation rates, and managed startup, operation, maintenance, and performance monitoring of an air sparge/soil vapor extraction remediation system. Provided technical analyses to optimize system performance and accelerate contaminant mass removal.

City and County of Denver–Former Stapleton International Airport Remediation, Denver, Colorado — Environmental scientist and hydrogeologist supporting investigation and remediation of hydrocarbon and solvent-impacted sites associated with the redevelopment of the former Stapleton International Airport. Conducted field investigations to define the nature and extent of contamination in soil, groundwater, and soil vapor. Responsibilities included lithologic logging using hollow-stem auger and direct-push drilling methods, environmental sampling and testing, remediation system installation and operation, data analysis, and technical reporting. Contributed to regulatory compliance and successful redevelopment of contaminated properties.

National Park Service–Mt. Rainier National Park, Longmire, Washington — Biologist and field crew leader supporting aquatic ecosystem research and monitoring programs within Mount Rainier National Park. Led field crews conducting aquatic habitat assessments, subalpine wetland monitoring, and ecological surveys in remote mountainous environments. Responsibilities included aquatic field sampling, wetland delineation and classification, biological species identification, environmental data collection, and laboratory analysis of aquatic samples. Contributed to long-term resource monitoring and scientific studies used to support ecosystem management, habitat conservation, and protection of sensitive aquatic and wetland resources.

Salt River Project; Superior Court of the State of Arizona, Maricopa County, Gila River Adjudication (Contested Case No. W1-106), Arizona — Expert witness and hydrogeologist providing technical analysis and expert testimony related to groundwater–surface water interactions, subflow depletion, and watershed hydrogeology within the Verde River Basin. Prepared and presented technical evaluations supporting the Subflow Zone Delineation Technical Report for the Remainder of the Verde River Watershed (August 2024), including review of hydrogeologic data, groundwater modeling, and assessment of water management impacts relevant to water rights adjudication proceedings.

Surface Water Coalition, Conjunctive Management Water Delivery Call, Idaho —  

• Idaho Department of Water Resources Transfer No. 84488 – Expert Witness and Hydrogeologist, Hearing Regarding the LCSC Enterprises Transfer Application, December 2025.
• Idaho Department of Water Resources Docket No. CM-DC-2010-001 – Expert Witness and Hydrogeologist, Hearing Regarding the Fifth Methodology Order, June 2023.
• Idaho Department of Water Resources Snake River Basin Moratorium Matter – Expert Witness and Hydrogeologist, Administrative Hearing Regarding the Consolidated Big Wood and Snake River Moratorium Matter, October 2023.
• Idaho Department of Water Resources Docket No. AA-GWMA-2016-001, Order Designating the Eastern Snake Plain Aquifer Groundwater Management Area, February 2020.

Rangen, Inc. Water Delivery Call, Idaho —  

• Idaho Department of Water Resources Case No. CM-DC-2014-004 – Expert witness and hydrogeologist, Distribution to Water Right No. 36-17011 (Rangen, Inc. Water Delivery Call), November 2015.
• Idaho Department of Water Resources Case No. CM-DC-2011-004 – Expert witness and hydrogeologist, Distribution to Water Right Nos. 36-02551 and 36-07694 (Rangen, Inc. Water Delivery Call), May 2013.

Stewart No. 1 Ditch Company, Colorado; Pitkin County Case No. 2014CV30084 — Expert witness and hydrogeologist, Pitkin County Board of County Commissioners v. Brothers, et al. (September 2015).

In-Play Golf, Colorado; Weld County Case 12CV727 — Expert witness and hydrogeologist, Helen Hawkins, et al. v. Vista Ridge Development Corporation, et al. (August 2015).

Boulder County Parks and Recreation Kenosha Ponds, Colorado; Water Division 1 Case No. 2010CW320 — Expert witness and hydrogeologist, water rights proceeding for the Kenosha Ponds project.