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Related Experiment Video

Updated: Jun 16, 2026

In Vitro Scratch Assay to Demonstrate Effects of Arsenic on Skin Cell Migration
09:24

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Published on: February 23, 2019

Arsenic management through well modification and simulation.

Keith J Halford1, Christina L Stamos, Tracy Nishikawa

  • 1U.S. Geological Survey, Carson City, NV 89701, USA. khalford@usgs.gov

Ground Water
|February 2, 2010
PubMed
Summary
This summary is machine-generated.

Selective well grouting effectively reduced arsenic concentrations in Antelope Valley groundwater wells. This simple strategy lowered arsenic levels below 2 microg/L in most treated wells, offering a sustainable solution.

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Area of Science:

  • Hydrogeology
  • Environmental Engineering
  • Water Resource Management

Background:

  • Naturally occurring arsenic in groundwater often exceeds safe drinking water limits (10 microg/L).
  • Long-screened wells in Antelope Valley, California, produce water with high arsenic concentrations, impacting water supply.
  • Arsenic contamination is primarily linked to lacustrine clay deposits and deeper aquifers within the wells.

Purpose of the Study:

  • To investigate the effectiveness of selective well grouting as a strategy to manage arsenic contamination.
  • To characterize the vertical distribution of arsenic in groundwater supply wells.
  • To assess the long-term viability and impact of well modification on water quality and well performance.

Main Methods:

  • Depth-dependent water-quality sampling and flow logging to determine arsenic vertical distribution.
  • Selective grouting of well intervals from the top of lacustrine clay deposits to the well bottom.
  • Numerical modeling using AnalyzeHOLE and MODFLOW to simulate well performance and long-term arsenic concentrations.

Main Results:

  • Selective grouting reduced produced arsenic concentrations to below 2 microg/L in four out of five modified wells.
  • Simulations indicated that well encrustations could increase arsenic concentrations by up to 2 microg/L.
  • Modified wells are projected to maintain simulated arsenic concentrations below 3 microg/L for 20 years.

Conclusions:

  • Selective well grouting is a viable and effective method for managing arsenic contamination in groundwater.
  • Well modification significantly reduces arsenic levels, ensuring safer drinking water supplies.
  • The strategy offers a sustainable solution for arsenic remediation in long-screened wells.