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| Publications— Open-File Report |
By Ronald A. Sloto
View the report in Portable Document Format (PDF) OFR 2008-1207 (1.85 MB)
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.
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)
For more information about USGS activities in Pennsylvania contact:
Director
USGS Pennsylvania Water Science Center
215 Limekiln Road
New Cumberland, Pennsylvania 17070
Telephone: (717) 730-6960
Fax: (717) 730-6997
or access the USGS Water Resources of Pennsylvania home page at:
http://pa.water.usgs.gov/.
