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Home > Society and Social Sciences > Education > Educational administration and organization > Borehole Geophysical Logging and Aquifer-Isolation Tests Conducted in Well MG-1693 at North Penn Area 5 Superfund Site Near Colmar, Montgomery County, Pennsylvania: Usgs Scientific Investigations Report 2006-5014
Borehole Geophysical Logging and Aquifer-Isolation Tests Conducted in Well MG-1693 at North Penn Area 5 Superfund Site Near Colmar, Montgomery County, Pennsylvania: Usgs Scientific Investigations Report 2006-5014

Borehole Geophysical Logging and Aquifer-Isolation Tests Conducted in Well MG-1693 at North Penn Area 5 Superfund Site Near Colmar, Montgomery County, Pennsylvania: Usgs Scientific Investigations Report 2006-5014


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Borehole geophysical logging and aquifer-isolation (packer) tests were conducted in well MG-1693 (NP-87) at the North Penn Area 5 Superfund Site near Colmar, Montgomery County, Pa. Objectives of the study were to identify the depth and yield of water-bearing zones, occurrence of vertical borehole flow, and effects of pumping on water levels in nearby wells. Caliper, natural-gamma, single-point-resistance, fluid-temperature, fluid-resistivity, heatpulse-flowmeter, and borehole-video logs were collected. Vertical borehole-fluid movement direction and rate were measured under nonpumping conditions. The suite of logs was used to locate water-bearing fractures, determine zones of vertical borehole-fluid movement, and select depths to set packers. Aquifer-isolation tests were conducted to sample discrete intervals and to determine specific capacities of water-bearing zones and effects of pumping individual zones on water levels in two nearby monitor wells. Specific capacities of isolated zones during aquifer-isolation tests ranged from 0.03 to 3.09 (gal/min)/ft (gallons per minute per foot). Fractures identified by borehole geophysical methods as water-producing or water-receiving zones produced water when isolated and pumped. Water enters the borehole primarily through high-angle fractures at 416 to 435 ft bls (feet below land surface) and 129 to 136 ft bls. Water exits the borehole through a high-angle fracture at 104 to 107 ft bls, a broken casing joint at 82 ft bls, and sometimes as artesian flow through the top of the well. Thirteen intervals were selected for aquifer-isolation testing, using a straddle-packer assembly. The specific capacity of interval 1 was 2.09 (gal/min)/ft. The specific capacities of intervals 2, 3, and 4 were similar: 0.27, 0.30, and 0.29 (gal/min)/ft, respectively. The specific capacities of intervals 5, 6, 7, 8, and 10 were similar: 0.03, 0.04, 0.09, 0.09, and 0.04 (gal/min)/ft, respectively. Intervals 9, 11, and 12 each showed a strong hydraulic connection outside the borehole with intervals above and below the isolated interval. The specific capacities of intervals 9, 11, 12, and 13 were similar: 2.12, 2.17, 3.09, and 3.08 (gal/min)/ft, respectively. The aquifer-isolation tests indicate that wells MG-1693 (NP-87) and MG-924 (NP-21) are connected primarily through the high-angle fracture from 416 to 435 ft bls. Pumping in either of these wells directly impacts the other well, allowing the pumped well to draw from water-bearing zones in the non-pumped well that are not present in or are not connected directly to the pumped wel


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Product Details
  • ISBN-13: 9781243697127
  • Publisher: Proquest, Umi Dissertation Publishing
  • Publisher Imprint: Proquest, Umi Dissertation Publishing
  • Height: 246 mm
  • Sub Title: Usgs Scientific Investigations Report 2006-5014
  • Width: 189 mm
  • ISBN-10: 1243697121
  • Publisher Date: 08 Sep 2011
  • Binding: Paperback
  • Spine Width: 3 mm
  • Weight: 113 gr


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Borehole Geophysical Logging and Aquifer-Isolation Tests Conducted in Well MG-1693 at North Penn Area 5 Superfund Site Near Colmar, Montgomery County, Pennsylvania: Usgs Scientific Investigations Report 2006-5014
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