PROJECT: GPR Survey of Hanford Area Facilities
LOCATION: Richland, Washington
PROJECT DESCRIPTION: Designed and performed a GPR survey of industrial sites, to determine the presence of buried USTs, piping and electrical conduit. Performed onsite instrument "calibration" with known onsite buried features, to establish reliable depth estimates.

PROJECT: GPR Survey with Confirmatory Drilling, Soil /Water Sampling and Analysis
LOCATION: Spokane, Washington
PROJECT DESCRIPTION: Designed and performed a tight-line / saturation Ground Penetrating Radar (GPR) survey of an active retail property, to determine the presence, if any, of buried 1950s-vintage underground storage tanks (USTs). Performed onsite instrument "calibration" with known onsite buried features, to establish reliable depth estimates. Directed drilling contractor in the strategic placement of soil borings, to confirm GPR interpretations. Successfully confirmed the absence of USTs at key locations having GPR anomalies solely attributable to an eroded bedrock surface. Directed subsequent groundwater sampling activities.

GEOTECHNICAL GEOPHYSICS: Seismic Refraction and Refraction Microtremor (ReMi™)

Utilizing state-of-the-art data processing technology and field equipment, EDI's geophysicists accurately determine:

Magnetic Surveys
 

Designed and performed a total-field magnetometer survey of a 26-acre wood-waste landfill. This magnetic survey was designed to detect buried metallic debris to a depth of 12 feet and was augmented by an EM-34 soil conductivity (soil mapping) survey.

Designed and performed (utilizing a total-field magnetometer) a gradiometer survey of an asphalt-paved parking lot for a US Bank property. The presumed target was an underground storage tank (UST) and associated fuel lines. Processed data to isolate residual anomalies and successfully and accurately located an abandoned fuel line and associated tank removal debris.

Designed and performed a total-field magnetic survey at an abandoned Atlas Missile silo in eastern Washington. Processed data to isolate residual anomalies and determined that no suspected metallic debris existed at survey location.

Designed and performed a high resolution total field magnetic survey of an abandoned dump site at a pulpwood processing facility in Louisiana. Processed data to isolate residual anomalies, which were correctly interpreted to be buried metallic debris occurring within ten feet of the surface. Woodward-Clyde Consultants project.

Designed and performed (utilizing a two-sensor magnetometer) a gradiometer survey of an abandoned dump site at a pesticides manufacturing facility in Arkansas. Correctly interpreted depth and location of buried metallic debris and utilized such findings to direct a safe environmental drilling operation. This (gradiometer) method enabled an effortless, yet effective removal of the considerable cultural "noise" that existed adjacent to the project area. Woodward-Clyde Consultants project.

Designed and performed a total-field magnetic survey in northwest Arkansas, in order to augment existing data (U.S. Geological Survey) that strongly indicate a large igneous mass at depth. All survey "loops" were properly closed and double checked for accuracy before leaving the project area. Manually reduced data and performed forward modeling of same in order to determine the vertical distance to the top of the body; interpreted to be approximately 17,000 feet deep. Colorado School of Mines project.

Electromagnetic Surveys

Designed and performed an EM-34 soil conductivity (soil mapping) survey of a 26-acre wood-waste landfill.  This soil mapping survey was designed to detect buried drums at a depth of 60 feet and was augmented by a total-field magnetometer survey.

While employed with the Arkansas Department of Pollution Control & Ecology (ADPC&E), performed approximately 40 reconnaissance EM-31 soil conductivity surveys of proposed landfill sites.

Performed an EM-31 soil conductivity survey of the U.S. Navy's Strategic Petroleum Reserve in Hackberry, Louisiana. Survey results enabled the prime contractor (Fluor Daniel) to design an effective perimeter warning system for the facility. Woodward-Clyde Consultants project.

Designed and performed an EM-61 metal detection survey of a 26-acre wood-waste landfill.  Survey was designed to detect buried metallic debris to a depth of 12 feet and was augmented by a total-field magnetometer survey.  Innovative in-field adjustments were made to address omnipresent data artifacts attributed to high brush, steep hummocks, and poor traction due to loose soil.

Performed an EM-34 soil conductivity (soil mapping) survey of a proposed 80-acre extension to an existing landfill. Results enabled prime contractor to locate ancient stream channels buried beneath the project area. Performed as a subcontractor to Browning Ferris Industries.

Designed and performed an EM-31 soil conductivity (soil mapping) survey at a convenience store site having significant hydrocarbon contamination of the near surface water table. Subsurface consisted of exposed vertical beds which disallowed otherwise predictable diffuse flow patterns. Survey results provided a plausible explanation for apparent conduit flow of contaminants; recommended recovery well locations were given to the client. Woodward-Clyde Consultants project.

ELECTRICAL METHOD

Vertical Electrical Soundings - Designed and performed vertical electrical soundings (VES) for proposed landfilling sites, utilizing an electrical resistivity system to determine depth to the water table. Arkansas Department of Environmental Quality (ADEQ) project.

Electrical Resistance Tomography - Participated in the Leak Detection Monitoring and Mitigation (LDMM) Project that utilized Electrical Resistance Tomography (ERT) developed by the Lawrence Livermore National Laboratory and implemented at the Hanford Nuclear Reservation located in south-central Washington State.

SEISMIC REFLECTION METHOD

Compiled and rigorously edited stacking velocity data to produce velocity maps at specified travel time intervals. These maps were verified to be extremely accurate, enabling exploration staff at AMOCO Production's Alaska North Slope group to make much needed time-depth conversions.

Produced time-structure Maps via interpretation of Gulf Coast seismic reflection data while employed with Conoco, Inc.

Produced time-structure Maps via interpretation of complex Overthrust Belt seismic reflection data for a graduate school project at the Colorado School of Mines.

Coordinated the processing of complex trace seismic reflection data for the Lafayette, LA, Corpus Christi, TX and Houston, TX exploration divisions. Efforts yielded more cost-efficient data processing and concurrently provided exploration staff with significantly enhanced data displays; often enabling more rapid prospect generation times for the company. Recognized by Corpus Christi Division Manager for enabling the early AFE (Authorization for Expenditure) for an oil well in that area.

While employed at Woodward-Clyde Consultants, critiqued shallow seismic reflection data acquired and processed by an independent geophysics contractor, regarding a proposed landfill site in northwest Arkansas. Recommended that client request contractor to reprocess data in order to better isolate refraction "first breaks" needed to determine the soil-bedrock interface.

Worked on a geophysics Vibroseis crew in Wyoming when employed with Conoco, Inc. Worked on a seismic reflection survey in the Front Range in Colorado, while assisting a fellow graduate student at the Colorado School of Mines.

GRAVITY METHOD

Designed and performed a multiple-traverse gravity survey across the geologic boundary between the Eastern Klamath Mountains and the Cascade Range provinces. Elevation surveying of gravity stations was performed utilizing non-GPS elevation surveying equipment. All survey "loops" were properly closed and double checked for accuracy before leaving the project area. Data processing incorporated sophisticated computerized terrain-corrections at all gravity stations, utilizing high resolution digital elevation data. Performed forward modeling of reduced (Complete Bouguer Anomaly) data to yield a geologically plausible interpretation of the complex subsurface geology in the Mt. Shasta area of northern California. Master's thesis, Colorado School of Mines.

Designed and performed "piggybacked" gravity traverses above and within the Department of Defense's experimental tunnel at Idaho Springs, Colorado. This graduate school project (Colorado School of Mines) was an attempt to determine the apparent density of the tunnel overburden. Location and elevation surveying was performed at all stations, in order to eliminate terrain related effects. Received an A+ grade for this innovative and unique project.

BOREHOLE LOG INTERPRETATION