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Assessment & Performance Monitoring

This category includes technical resources used to assess subsurface conditions and evaluate remediation performance over time. Materials focus on quantitative, field-validated methods for understanding groundwater flow, contaminant transport, mass flux, and transformation processes, supporting defensible decision-making during site characterization, remedy selection, and long-term monitoring.

Sub Categories

Compound-Specific Isotope Analysis
Compound-Specific Isotope Analysis (CSIA) is an advanced analytical technique that measures stable isotope ratios (e.g., ¹³C/¹²C, ²H/¹H) in individual organic compounds rather than bulk samples. CSIA is used to identify contaminant sources (fingerprinting), distinguish biodegradation from abiotic transformation processes, and differentiate true degradation from physical processes such as dilution or volatilization. In environmental remediation, CSIA provides direct lines of evidence for contaminant transformation and is widely applied in performance monitoring, site assessment, and regulatory decision-making for complex subsurface systems.
Mass & Groundwater Flux
Mass and groundwater flux measurement quantifies contaminant mass discharge and groundwater flow across defined control planes, providing a robust basis for plume characterization, remedy evaluation, and long-term performance monitoring.
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