Key Staff
Pete Arntsen, MS, PH, PG
Pete Arntsen has more than 35 years of experience as an environmental scientist and project manager, and came to Sand County Environmental in 2009.
His education and experience focuses on contaminant-release investigations and remediations; hydrologic, geologic, and hydrogeologic studies; landfill environmental studies; wetland delineation and permitting; regulatory compliance; and environmental litigation support.
Jacob Cafferty, MS, TSSA
Jacob Cafferty graduated from the University of Wisconsin with a Bachelor’s degree in Environmental Science and Management. He is currently pursuing his Master’s degree in Natural Resources, Conservation, and Leadership. Currently he is a certified Tank System Site Assessor.
Jacob has experience working as a wildlife rehabilitator and fishery technician. Since 2019, he has also been a member of the Wisconsin Air National Guard.
Ken Ebbott, MS, PG, CGWP
With 30 plus years of experience, Ken Ebbott’s areas of specialty include soil, groundwater, and vapor investigation and remediation.
Examples of his work include: investigation, remediation, and closure of brownfield, foundry, agrichemical, petroleum, and drycleaner sites, including recent efforts to remove pesticides and solvents from groundwater using innovative chemical injection techniques.
Nichole Good, MS, PSS, TSSA
Nichole began working for Sand County Environmental in 2015. Her educational background includes ecosystem restoration and soil science. Nichole’s certifications include Professional Soil Scientist, Tank System Site Assessor, and Certified Soil Tester. She is a project manager specializing in agricultural‑chemical facilities. Nichole manages environmental projects from beginning stages through case closure. Her duties include conducting Phase I and II Environmental Site Assessments, managing environmental investigations, helping clients understand options for their sites, performing soil and groundwater testing, and more.
Brenda Halminiak, PG, CHMM
Brenda Halminiak has a bachelor’s degree in Geology. She is a licensed Professional Geologist in the state of Wisconsin, with over 22 years of experience in landfill monitoring, phytoremediation, and hazardous waste management.
She has over 10 years of experience in environmental consulting and project management and is a Certified Hazardous Materials Manager. She formerly served on the Wisconsin Examining Board of Professional Geologists, Hydrologists and Soil Scientists, and has been actively involved with the Association of State Boards of Geology (ASBOG) for nearly 20 years.
Marcie Koziczkowski
Marcie has been with Sand County Environmental as an administrative assistant for over a decade, having started in 2014. Marcie has more than 35 years of experience in the administrative sphere.
Marcie provides support, expertise, and technical review in accounting and invoicing. Marcie has worked closely with the Agricultural Chemical Cleanup Program (ACCP) that is designed for responsible parties that have sites requiring cleanup of spills.
Julie Prahl
Julie Prahl has been with Sand County Environmental since 2021 as an administrative assistant. Prior to joining our team, Julie provided administrative support for over 25 years in the legal field.
As an administrative assistant, Julie primarily works with reviewing, editing, and finalizing reports and submittals. Julie provides technical and professional insights on reports, memorandums, and letters for a variety of projects.
Levi Rhody, MS, PG, Certified Asbestos Inspector
Levi has been with Sand County since July of 2018 as a geologist. Levi has educational background in geology and environmental geosciences. He is licensed as a Professional Geologist with the State of Wisconsin.
As a geologist, Levi assists with implementing and reporting on soil and groundwater remediation activities including soil excavation, engineered cap installation, and phytoremediation. He also conducts environmental site investigations, as well as monitoring landfill parameters as directed by the Wisconsin Department of Natural Resources.
Bart Sexton, MS, PSS
Bart Sexton, a soil scientist, has extensive experience in designing, specifying, coordinating, and overseeing projects. His projects entail: environmental monitoring; reporting; remediation; earthwork, including excavation and stormwater structure construction; treatment of well water and landfill leachate to reduce per- and polyfluoroalkyl substances (PFAS) concentrations, and phytoremediation projects.
His work in phytoremediation involves treating groundwater, stormwater, wastewater effluent, landfill leachate, and impacted soils. Additional experience includes: permitting; operations; troubleshooting; and monitoring, reporting, and closure of landfills and composting facilities.
Lars Smith, BS
Lars Smith has over 16 years of experience in applied environmental science.
His experience includes the investigation and remediation of soil and groundwater contamination using traditional and progressive strategies, working with vapor investigations, as well as gas extraction systems.
Lars also performs wetland delineations, designs and implements wetland restorations, and provides treatment wetland support. He also has extensive experience directing the implementation and maintenance of phytoremediation systems.
Lars is a licensed pesticide applicator, private on-site wastewater treatment system (POWTS) maintainer, licensed drone pilot, and is experienced in utilizing the AutoCAD and Civil 3D software programs for drafting such as plans, designs, and figures.
Amy Volhard, AS, Certified Asbestos Inspector
Amy Volhard has been with Sand County Environmental since 2021 as an environmental technical assistant. As a technical assistant, Amy provides support in several different areas within the company. These areas include IT, administrative, clerical, field-work, and marketing support.
Amy is especially proficient with the assembly of closure requests for contaminated sites in Wisconsin. She also works with the ACCP program.
Amy is our Certified Asbestos Inspector for the company.
Stacy Stroud, BS
Stacy Stroud has more than 20 years of experience in the environmental consulting field, specifically in directing and coordinating all work processes for administrative staff.
Her areas of specialization include technical review of reports, letters, and memorandums; and provide IT support where she performs basic computer functions including troubleshooting computer issues, maintaining the company server, and supports the internal terminal service infrastructure.
Carol Teschner
Carol Teschner joined the team at Sand County Environmental as a technical assistant in 2014. Before Carol was hired at Sand County Environmental, she held various positions in the financial world for over 35 years.
As a technical assistant, Carol aids in finalizing tables and charts for various reports and submittals, as well as helping with whatever other clerical items she can. Carol possesses a high‑level of technical expertise with the Microsoft Office suite.
Mathew Weiss, BS, PE, TSSA
Mat Weiss has a bachelor’s degree in Civil Engineering with a concentration in Environmental and Water Resources Engineering. He started working with the company in fall 2024.
Mat is a licensed Professional Engineer in the state of Wisconsin, with experience in site design engineering, specializing in stormwater management design. He has worked as a project engineer within an air quality compliance organization. Mat also functions as a draftsperson for the company and provides drafting and modeling support with AutoCAD Civil3D, HydroCAD, and WinSLAMM.
Mat is the project manager for a number of landfill monitoring and agricultural-chemical cleanup projects, he performs Phase I Environmental Site Assessments, and is a certified Tank System Site Assessor.