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Evaluation of borehole geophysical logs and hydraulic tests, phase III, at AIW Frank/Mid-County Mustang Superfund Site, Chester County, Pennsylvania

Water-Resources Investigations Report 2001-4004
Prepared in cooperation with the Environmental Protection Agency
By:
https://doi.org/10.3133/wri014004

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Abstract

Borehole geophysical logs, heatpulse-flowmeter measurements, and aquifer-isolation tests were used to characterize the ground-water-flow system at the AIW Frank/Mid-County Mustang Superfund Site. The site is underlain by fractured carbonate rocks. Caliper, natural-gamma, single-point-resistance, fluid-resistivity, and fluid-temperature logs were run in six wells, and an acoustic borehole televiewer and borehole deviation log was run in one well. The direction and rate of borehole-fluid movement was measured with a high-resolution heatpulse flowmeter for both nonpumping and pumping conditions in four wells. The heatpulse-flowmeter measurements showed flow within the borehole during nonpumping conditions in three of the four wells tested. Flow rates up to 1.4 gallons per minute were measured. Flow was upward in one well and both upward and downward in two wells. Aquifer-isolation (packer) tests were conducted in four wells to determine depth-discrete specific capacity values, to obtain depth-discrete water samples, and to determine the effect of pumping an individual fracture or fracture zone in one well on water levels in nearby wells. Water-level data collected during aquifer-isolation tests were consistent with and confirmed interpretations of borehole geophysical logs and heatpulse-flowmeter measurements. Seven of the 13 fractures identified as water-producing or water-receiving zones by borehole geophysical methods produced water at a rate equal to or greater than 7.5 gallons per minute when isolated and pumped. The specific capacities of isolated fractures range over three orders of magnitude, from 0.005 to 7.1 gallons per minute per foot. Vertical distribution of specific capacity between land surface and 298 feet below land surface is not related to depth. The four highest specific capacities, in descending order, are at depths of 174-198, 90-92, 118-119, and 34-37 feet below land surface.

Suggested Citation

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 Investigation Report 2001–4004, 39 p., https://pubs.er.usgs.gov/publication/wri014004.

Study Area

Table of Contents

  • Abstract
  • Introduction 
  • Methods of investigation 
  • Evaluation of borehole geophysical logs and aquifer-isolation tests
  • Evaluation of borehole geophysical logs for well RW-1 (CH-5804)
  • Evaluation of borehole geophysical logs for well RW-4 (CH-5807)
  • Evaluation of borehole geophysical logs for well OB-5 (CH-5447) 
  • Summary and conclusions
  • References cited
Publication type Report
Publication Subtype USGS Numbered Series
Title Evaluation of borehole geophysical logs and hydraulic tests, phase III, at AIW Frank/Mid-County Mustang Superfund Site, Chester County, Pennsylvania
Series title Water-Resources Investigations Report
Series number 2001-4004
DOI 10.3133/wri014004
Year Published 2001
Language English
Publisher U.S. Geological Survey
Publisher location Reston, VA
Contributing office(s) Pennsylvania Water Science Center
Description vi, 33 p.
Country United STates
State Pennsylvania
Online Only (Y/N) Y
Google Analytic Metrics Metrics page
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