Tandem Environmental

About Tandem

Tandem Environmental, LLC provides specialized environmental consulting services for companies, government agencies, and research groups. With experience in hydrogeology, high-resolution and adaptive site characterization, and PFAS technical consulting, Tandem works in partnership to deliver actionable solutions for the most challenging environmental projects.

Founded by Kristen Hasbrouck, PG, Tandem Environmental emphasizes a multidisciplinary approach, integrating advanced scientific methods and practical field experience to evaluate contaminant fate and transport across multiple media. This holistic perspective supports the design of robust site investigations and the development of data-driven conceptual site models (CSMs) that reflect the complexity of real-word conditions. Tandem supports regulatory compliance, risk evaluation, and remedial planning across federal and private-sector projects.

We are committed to technical excellence, innovation, and collaboration, ensuring that stakeholders and clients have the insights they need to make confident, science-based decisions.

Work in Tandem with us!

Our Services

Expert environmental consulting for hydrogeology and site characterization.

High-Resolution Site Characterization

Design and implementation of adaptive, high-resolution investigation programs to evaluate complex subsurface conditions. Integration of lithology, geochemistry, and hydraulic profiling provides accurate and defensible conceptual site models.

PFAS Expertise

Subject-matter expertise in PFAS fate and transport and mass flux/discharge analysis supports comprehensive site investigations and remedial planning. Services include regulatory compliance guidance, field troubleshooting, and technical strategy for addressing emerging contaminants.

Hydrogeology Services

Comprehensive hydrogeologic investigations supporting site characterization, remedial planning, and risk evaluation. Services include aquifer testing, hydraulic profiling, vertical aquifer profiling, slug and pumping tests, and groundwater flow analysis. Expertise in lithologic and hydrostratigraphic interpretation, well design and installation (including multi-port and horizontal wells), and porewater sampling with lysimeters. Integration of hydrogeologic data with geochemistry, contaminant transport, and multi-dimensional conceptual site models ensures accurate evaluation of subsurface conditions and contaminant migration pathways.

Data Visualization

Transformation of complex environmental data into multi-dimensional visualizations that communicate hydrostratigraphy, contaminant transport, and risk. These models enhance stakeholder understanding, improve decision-making, and strengthen remedial strategy development.

Interested in collaborating? Let's work in Tandem.