Stephen Farrington

Transcend Engineering

A new sensor technology, the Profile Resolving In-situ Soil Moisture Sensor (PRISMS), offers the potential to advance understanding of coupled biogeochemical and hydrologic processes in the near subsurface critical zone by acquiring continuous vertical profiles of near surface soil moisture. We present results of comparing PRISMS acquired soil mois...

The Simple Cabled Instrument for Measuring Parameters in-situ (SCIMPI) is a new borehole observatory instrument designed to study dynamic processes below the seafloor. SCIMPI performs time series measurements of temperature, pressure and electrical resistivity at a series of depths, tailored for site-specific scientific objectives. SCIMPI's modular...

The Simple Cabled Instrument for Measuring Parameters In-situ (SCIMPI) is a new seafloor observatory instrument. SCIMPI is designed to take subsurface time series measurements of temperature, pressure and resistivity in the sub-seafloor. This instrument has a battery operational life of approximately two years, which can be replaced with a battery...

The Simple Cabled Instrument for Measuring Properties In Situ (SCIMPI) is a proposed new long-term seafloor observatory system for sub-seafloor studies. The SCIMPI sensors, initially proposed, include temperature sensors, resistivity sensors, and pore pressure transducers. The design easily accommodates integration of other sensors (e.g., geophones...

Cone Penetration Testing (CPT) is a flexible and cost effectiveness in situ characterization technique, able to determine a wide array of subsurface properties and conditions with fine spatial resolution. However, refusal of the probe at shallower than desired depths has remained a limitation in difficult geologies. The Enhanced Access Penetrometer...

Time Domain Reflectometry (TDR) has been utilized to monitor slope movement in a variety of geotechnical settings including highway cuts, rail beds, and open pit mines. Until now, the interpretation of TDR results for detecting slope movement and identifying the location of shear planes has been limited to visual inspection of the plots of cable re...

Described is the architecture of WebDACS, a web-based data acquisition and control system for geotechnical and environmental monitoring instrumentation. WebDACS automatically collects data from field instrumentation and delivers it to a central data store for visualization and reporting though a standard web browser. The system's flexible architect...

Unpaved roads in Vermont are subject to deterioration from seasonal freezing and thawing, and many towns have roads that suffer chronic serviceability problems during the so-called "spring thaw," or mud season. Several techniques thought to mitigate deterioration of unpaved roads during spring thaw were constructed on test sections of unpaved roads...

Passage of the Resource Conservation and Recovery Act (RCRA) by Congress in 1976 addressed management of hazardous and nonhazardous wastes generated at active industrial facilities and landfills. In 1980, passage of the Comprehensive Environmental Response Compensation and Liability Act (CERCLA, commonly called "Superfund") addressed hazardous wast...

Long-term monitoring (LTM) associated with subsurface contamination sites is a key element of Long Term Stewardship and Legacy Management across the Department of Energy (DOE) complex. However, both within the DOE and elsewhere, LTM is an expensive endeavor, often exceeding the costs of the remediation phase of a clean-up project. The primary contr...

The objective of this study was to demonstrate that long-term groundwater monitoring results from direct push wells agree with those from conventionally drilled wells, the currently accepted baseline technology. Five field sites were included in the study to represent a variety of geological conditions as well as a cross-section of regulatory domai...

A N D L E ftv I T H C A R E DATERETURNED

The U.S. Department of Defense (DoD) and Department of Energy (DoE) are currently pursuing efforts to identify and remediate thousands of contaminated sites. Current efforts are focused on economizing, and improving the quality of site characterization and remediation processes. Cone Penetrometer Technology (CPT) offers numerous advantages in that...

The first phase of development of a wireline cone penetrometer system for multiple tool usage was completed under DOE award number DE-AR26-98FT40366. Cone penetrometer technology (CPT) has received widespread interest and is becoming more commonplace as a tool for environmental site characterization activities at several Department of Energy (DOE)...

ARA developed a geophysical tomographic system that incorporates results from Electrical Resistivity Tomography (ERT) measurements and Ground Penetrating Radar (GPR) Tomography measurements. Both methods are useful for imaging subsurface structures and processes, however, GPR is more effective in sandy material and ERT is more effective in clayey m...

Conventional soil and groundwater sampling procedures present many opportunities for loss of volatile organic compounds (VOC) by exposing sample media to the atmosphere during transfers between sampling devices and containers, ultimately affecting the quality of the analytical results. Inaccurate characterization data often leads to improperly desi...

The U.S. Department of Energy (DOE) is responsible for the cleanup of inactive; DOE sites and for bringing DOE sites and facilities into compliance with federal, state and; local laws and regulations. The DOE's Office of Environmental Management (EM) needs; advanced technologies that can make environmental restoration and waste management; operatio...

Decision processes during characterization and cleanup of hazardous waste sites are greatly retarded by the turnaround time and expense incurred through the use of conventional sampling and laboratory analyses. Furthermore, conventional soil and groundwater sampling procedures present many opportunities for loss of volatile organic compounds (VOC)...