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Principals & Associates
Janet Knox, LG, Principal Environmental Geochemist
Janet has over 25 years of experience in the investigation and remediation of soil, sediment, surface water, and groundwater. She has crafted sampling and analysis programs to assess the types, sources, and receptors of contamination, and she has occasionally served as an expert witness in complex environmental litigation. Her innovative strategies reflect a commitment to keep up with the changing world of environmental cleanup and its many regulations. An active participant in the MTCA Policy Advisory Subcommittees, Janet helped make MTCA more scientifically defensible and practical.
Charles Ellingson, LHG, RG, PG, CGWP, Principal Hydrogeologist
Mr. Ellingson is a co-founder and principal hydrogeologist of Pacific Groundwater Group, bringing the firm nearly three decades of experience in groundwater impact predictions, aquifer protection, contaminant hydrogeology, basin hydrology, and water supply development. His educational background in groundwater hydraulics complements his experience exploring, testing, and modeling a wide variety of groundwater regimes: single- and multi-aquifer systems, unsaturated soils, and shallow groundwater influences on stormwater and wetlands. He has directed groundwater development projects that have involved evaluating regional aquifers, siting and designing wells and well fields, and analyzing impacts to surface water. Mr. Ellingson’s other areas of expertise include groundwater management, contaminant assessment, design of remedial measures, and modeling the hydrologic effects of land use changes. He was an invited participant in the State’s technical advisory committee on hydraulic continuity and co-authored Report of the Technical Advisory Committee on the Capture of Surface Water by Wells, produced for Ecology in 1998. Mr. Ellingson recently managed a multi-disciplinary team to independently assess hydrologic effects from construction of the SeaTac third runway, evaluating potential impacts to groundwater, surface water, and wetlands from an open-pit mining proposal in Thurston County, and leading the groundwater efforts necessary to develop a basin plan focused on groundwater flood mitigation for Salmon Creek in Thurston County.
Daniel Matlock, LHG, Principal Hydrogeologist
Dan has 24 years of experience in many areas related to managing and developing groundwater supplies. His specialties include evaluating and testing regional aquifers, developing plans for wellhead and watershed protection, designing data management systems, assessing water quality, crafting groundwater management strategies, and designing monitoring systems. His extensive background in well hydraulics is an asset to the many water purveyors for whom he has developed well fields, conducted artificial recharge studies, and evaluated surface water and groundwater interactions.
Stephen Swope, LHG, RG, PG, Principal Hydrogeologist
For over 15 years, Steve has conducted hydrogeologic and environmental site assessments, developed water supplies, and managed multidisciplinary WRIA basin assessments — regional-scale studies of water use and availability, habitat, and water rights. He has also supervised Superfund investigations on the nature, extent, fate, and transport of contaminants. One of Steve’s specialties is developing data management systems for water resources information and statistical analysis plans for landfill monitoring. His experience also extends to the areas of groundwater modeling, wellhead protection, and expert witness / litigation support.
Peter Schwartzman, LHG, Principal Hydrogeologist
Peter has been involved in local hydrogeologic site assessments, regional groundwater resource evaluations, water supply development, and contaminant hydrology for over 20 years. His educational background in geology and hydrology is complemented by project experience in such areas as: characterization and computer modeling of groundwater flow systems; assessment of stream-aquifer interaction and saltwater intrusion; design/installation of water supply and monitoring wells; aquifer testing; stream gauging; and contaminant delineation. Peter has developed a variety of regional and local groundwater flow models, and is proficient in many computer applications to hydrogeology. He has modeled groundwater recharge based on climatic, soils and land-use factors; infiltration of recharge through the unsaturated zone; and a wide variety of saturated flow systems. In addition, he has co-instructed groundwater modeling courses and has contributed to the development of groundwater modeling software.
Linton Wildrick, LHG, Associate Hydrogeologist
A 22-year veteran of Ecology’s Water Resources Division, Linton brings us his vast experience in hydrogeologic investigations. He has been the primary investigator in many regional studies and has published over 40 papers. He has also lead basin-wide watershed assessments throughout Washington State in a variety of hydrogeologic environments. A special area of Linton’s expertise is the analysis of interactions between surface water and groundwater. While at Ecology, he advised managers and permit writers on hydrologic aspects of water-rights policy and served as the lead scientist on the Technical Committee for Capture of Surface Water by Wells. He has extensive experience as an expert witness in water rights cases.
Glen Wallace, Ph.D., LG, Associate Geologist
Glen has 15 years of experience in geology including consulting and academic experience. Glen has experience in contaminated site investigation and remedial design, contaminant fate and transport, groundwater modeling, monitoring well design and installation, structural geologic analysis, file review in support of legal action and expert witness testimony, environmental site assessment, landfill environmental monitoring and corrective action, and database management.