In cooperation with the U.S. Air
Force, Aeronautical Systems Center,
Environmental Management Directorate, Wright-Patterson Air Force Base, Ohio
Subsurface Evaluation
of the West Parking Lot and Landfill 3
Areas of Air Force Plant 4, Fort Worth, Texas, Using Two-
Dimensional Direct-Current Resistivity Profiling
By Christopher L. Braun and S.A. Jones
U.S. Geological Survey
Water-Resources Investigations Report 02–4248
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CONTENTS
Abstract
Introduction
Purpose and Scope
Description of the Study Area
Acknowledgments
Methods
Two-Dimensional Direct-Current Resistivity Profiling
Data Acquisition
Data Processing
Subsurface Evaluation
West Parking Lot Transects
PL–1
PL–2
PL–3
PL–4, PL–5, and PL–6
Landfill 3 Transects
GR–1
GR–2
GR–3
GR–4
Horizontal Sections
Section 192
Section 190
Section 188
Section 186
Summary
References
PLATES
1–5. |
Maps showing: | |
1. |
Location of two-dimensional direct-current resistivity transects in study area | |
2. |
Water-level altitudes in the Walnut Formation, February 15, 2000, Air Force Plant 4, Fort Worth, Texas | |
3. |
Land-surface altitude, Air Force Plant 4, Fort Worth, Texas | |
4. |
Terrace alluvium/fill thickness (base of terrace alluvium/fill represents top of Walnut Formation), Air Force Plant 4, Fort Worth, Texas | |
5. |
Depth to top of Paluxy Formation, Air Force Plant 4, Fort Worth, Texas | |
6. |
Sections showing graphics used to interpret transect PL–4, Air Force Plant 4, Fort Worth, Texas | |
7–9. |
Maps showing: | |
7. |
Approximate extent of dense nonaqueous-phase liquid (DNAPL) in Walnut Formation based on IT Corporation field observations, Air Force Plant 4, Fort Worth, Texas | |
8. |
Altitude of top of Walnut Formation (top of Walnut Formation represents base of terrace alluvium/fill), Air Force Plant 4, Fort Worth, Texas | |
9. |
Altitude of top of Paluxy Formation, Air Force Plant 4, Fort Worth, Texas | |
10–11. |
Sections showing graphics used to interpret transects: | |
10. |
PL–1, PL–2, PL–3, PL–5, and PL–6, Air Force Plant 4, Fort Worth, Texas | |
11. |
GR–1, GR–2, GR–3, and GR–4, Air Force Plant 4, Fort Worth, Texas | |
12–15. |
Maps showing inverted resistivity values along a horizontal section at an altitude of: | |
| 192 meters above sea level, Air Force Plant 4, Fort Worth, Texas | ||
| 190 meters above sea level, Air Force Plant 4, Fort Worth, Texas | ||
| 188 meters above sea level, Air Force Plant 4, Fort Worth, Texas | ||
| 186 meters above sea level, Air Force Plant 4, Fort Worth, Texas | ||
FIGURES
1. |
Map showing location of study area |
2. |
Diagram showing three-dimensional representation of inverted resistivity from field data along four horizontal sections at altitudes of 192, 190, 188, and 186 meters above sea level in the west parking lot of Air Force Plant 4, Fort Worth, Texas |
VERTICAL DATUM
Sea Level: In this report, “sea level” refers to the National Geodetic Vertical Datum of 1929—a geodetic datum derived from a general adjustment of the first-order level nets of the United States and Canada, formerly called Sea Level Datum of 1929.
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