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Interpretation of Borehole Geophysical Logs at Area C, Former Naval Air Warfare Center, Warminster Township, Bucks County, Pennsylvania, 2007

U.S. Geological Survey Open-File Report 2008-1207

Prepared in cooperation with the U.S. Navy

By Ronald A. Sloto


View the report in Portable Document Format (PDF) OFR 2008-1207 (1.85 MB)


Abstract

This study was done by the U.S. Geological Survey in cooperation with the U.S. Navy at Area C of the former Naval Air Warfare Center in Warminster Township, Bucks County, Pa., in support of hydrogeological investigations conducted by the Navy to address ground-water contamination in the Stockton Formation. Borehole geophysical logs were collected, heatpulse-flowmeter measurements were made, and borehole television surveys were run in seven boreholes ranging from 31 to 75 feet deep. Caliper logs and borehole television surveys were used to identify fractures and the location of possible water-bearing zones. Heatpulse-flowmeter measurements were used to identify fractures that were water-bearing zones. Natural-gamma and single-point-resistance logs were used to correlate lithology across the area. Elevated concentrations of tetrachloroethylene (PCE) were measured in water samples from wells with water-bearing zones in the interval of the aquifer where monitor well HN-23A is screened. Water samples from wells with water-bearing zones above or below this interval had substantially lower concentrations of PCE. Wells screened in this interval yielded less than 0.5 gallon per minute, indicating that the interval has low permeability; this may account for the small areal extent and slow migration of PCE.

Table of Contents

Abstract
Introduction
     Purpose and Scope
     Hydrogeologic Setting
     Well-Identification System
Methods of Investigation
     Borehole Geophysical Logs
     Heatpulse-Flowmeter Measurements
     Borehole Television Surveys
Interpretation of Borehole Geophysical Logs at Area C
     Well HN-23A (BK-3040)
     Well HN-101-OB (BK-3039)
     Well HN-101-S (BK-3038)
     Well HN-102-S (BK-3037)
     Well HN-103-S (BK-3035)
     Well HN-104-S (BK-3036)
     Well HN-105-S (BK-3041)
     Correlation of Borehole Geophysical Logs
Summary and Conclusions
Acknowledgments
References Cited


Suggested citation:
Sloto, R.A., 2008, Interpretation of borehole geophysical logs at Area C, former Naval Air Warfare Center, Warminster Township, Bucks County, Pennsylvania, 2007: U.S. Geological Survey Open-File Report 2008-1207, 20 p.


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View the report in Portable Document Format (PDF) OFR 2008-1207 (1.85 MB)


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Fax: (717) 730-6997
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