HYDROLOGIC INVESTIGATION AT THE AIW FRANK/MID-COUNTY MUSTANG SUPERFUND SITE, CHESTER COUNTY, PENNSYLVANIA

This project was done in cooperation with The U.S. Environmental Protection Agency.

NEED FOR THE STUDY

The U.S. Environmental Protection Agency requested the assistance of the USGS in the hydrogeological investigation at the AIW Frank/Mid-County Mustang Superfund Site. The primary purpose of the hydrogeological investigation was the installation of monitor, observation, and extraction wells for site remediation. To aid the U.S. EPA in this investigation, the USGS ran borehole geophysical logs and borehole television surveys in the wells and conducted aquifer and packer tests.

OBJECTIVE

Borehole geophysical logging, borehole television surveys, and hydraulic tests were performed by the USGS to characterize the hydrogeology of the site.

APPROACH

Borehole geophysics were used to:

• Locate hydraulically active subsurface fractures
  
• Determine strike and dip of hydraulically active subsurface fractures
  
• Identify zones of flow within wells
  
• Measure the direction and rate of borehole flow within wells
  

The following borehole geophysical logs were run by the USGS:

• Caliper
  
• Natural gamma
  
• Single-point electrical resistance
  
• Fluid temperature
  
• Fluid resistively
  
• Fluid velocity using a heatpulse flowmeter
  
• Acoustic logs using a borehole acoustic televiewer
  

The following hydraulic tests were performed by the USGS to characterize the hydrogeology of the site:

• Slug tests
  
• Aquifer tests
  
• Aquifer isolation (packer) tests
  

REPORTS RESULTING FROM THIS STUDY

Conger, R.W., Goode, D.J., and Sloto, R.A., 2000, Evaluation of Geophysical Logs and Slug Test, Phase II, at AIW Frank/Mid-County Mustang Superfund Site, Chester County, Pennsylvania: U.S. Geological Survey Open-File Report 99-452, 28 p. [ PDF file ]

Sloto, R.A., 2001, Evaluation of borehole geophysical logs and hydraulic tests, Phase III, at AIW Frank/Mid-County Mustang Superfund site, Chester County, Pennsylvania: U.S. Geological Survey Water-Resources Investigations Report 01-4004, 33 p. [ PDF file ]

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