Sites contaminated by chlorinated solvents present a remediation challenge. Chlorinated solvents are among the most difficult groundwater contaminants to remediate, especially at sites with dense, non-aqueous-phase liquid (DNAPL) still present in the source zone. Restoring sites contaminated by chlorinated solvents to regulatory criteria (low parts-per-billion concentrations) within a generation (~20 years) is difficult. Site managers … Continue reading
Integrated site characterization (ISC) is a process for improving the efficiency and effectiveness of characterization efforts at DNAPL sites. It encourages characterization at a sufficient resolution to capture the effects of the heterogeneities that direct contaminant distribution, fate, and transport, and remediation effectiveness, so that an integrated three-dimensional conceptual site map (CSM) can be developed … Continue reading
The Tool Selection Worksheet offers a rapid method of identifying the appropriate tools and information for collecting geologic, hydrologic, and chemical data. Specific tools and techniques are listed in the following categories within the left column of the Tool Selection Worksheet: Geophysics surface geophysics downhole testing Hydraulic testing single well tests cross borehole testing Vapor … Continue reading
A monitoring approach that relates remedy performance to site-specific SMART functional objectives is a critical element of an integrated strategy. The monitoring approach must include a spatially and temporally sufficient and reliable data set of the remedy performance. An appropriate monitoring program should be dynamic and adjusted to accommodate new data and changing conditions as … Continue reading
