Science & Technology

Single Borehole Tracer (SBT) Logging

Borehole Tracer pulse methods, Dye dilution

Borehole Formation Microresistivity Imaging (FMI)

Borehole Formation MicroImager

Ground Penetrating Radar (GPR)

Ground Penetrating Radar (GPR) technical description

Surface Wave Methods

A wide variety of seismic waves propagate along the surface of the earth. They are called surface waves because their amplitude decreases exponentially with increasing depth.

Electromagnetic Methods: Metal Detectors

The term "metal detector" (MD) generally refers to some type of electromagnetic induction instrument, although traditional magnetometers are often used to find buried metal.

Surface to Borehole Procedures

There is a progression in both complexity and benefits from check shot and synthetic seismogram to vertical seismic profiles (VSP), three‑component VSP, offset VSP, and extrapolation and description of lithologic parameters into the geologic formations.

Logging Techniques and Tools: Flow Logging

The measurement of flow within and between wells is one of the most useful well-logging methods available to interpret the movement of groundwater and contaminants.

Logging Techniques and Tools: Acoustic Logging

In this section the numerous techniques used in logging are discussed, including hole-to-hole methods.

What If One of Your Cars was Electric?

Thought starter about potential ideas for reducing transportation carbon pollution.

Watershed Protection: A Project Focus

A blueprint for designing and implementing watershed projects including references and case studies for specific elements of the process.

2005 NATA: Assessment Results

Downloadable data files for the 2005 NATA; state-by-state results

Groundwater Level and Well Depth Measurement

Field branches quality systems and technical prodedures

Sediment Sampling

Field Branches Quality System and Technical Procedures

LC50

Page notes that LC50 (lethal concentration, 50%) model, which estimates LC50 values, has been archived & is no longer available on CEAM site

ICE

Notes that ICE model has been archived & is no longer available on the EPA Center for Exposure Assessment Modeling (CEAM) Web site. CEAM recommends use of the Web-ICE on-line application

TMDL USLE

Notes that the Total Maximum Daily Load (TMDL) Universal Soil Loss Equation (USLE) model has been archived and is no longer available on the CEAM Web site.

Map of Weather Stations and State Parts of MLRA - Legend

Legend for map of weather station locations from EPA database of meteorological data files (for use with CEAM & other software models), overlaid on Major Land Resource Areas.

Key to Land Resource Regions (LRR) and Major Land Resource Areas

Codes to MLRA (Major Land Resource Areas) descriptive titles for use with EPA database of meteorological data files (to use with CEAM & other software models)