Link to U.S. Geological Survey home page.

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


Document Accessibility: Adobe Systems Incorporated has information about PDFs and the visually impaired. This information provides tools to help make PDF files accessible. These tools convert Adobe PDF documents into HTML or ASCII text, which then can be read by a number of common screen-reading programs that synthesize text as audible speech. In addition, an accessible version of Acrobat Reader 5.0 for Windows (English only), which contains support for screen readers, is available. These tools and the accessible reader may be obtained free from Adobe at http://access.adobe.com/.

pdf version (511 KB)

zipped plates 1–15 (3.65 MB)


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.




U.S. Department of the Interior, U.S. Geological Survey
Persistent URL: http://pubs.water.usgs.gov/wri024248
Page Contact Information: GS Pubs Web Contact
Last modified: Friday, September 16 2005, 04:23:51 PM
FirstGov button  Take Pride in America button