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Model Study of Diisopropylmethylphosphonate (DIMP) Contamination, Rocky Mountain Arsenal Near Denver, Colorado. Phase 1

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The Rocky Mountain Arsenal requested that the U.S. Geological Survey conduct a digital-model study of the DIMP contamination of ground water on the arsenal and surrounding property in order to provide insight into the mechanism of DIMP transport and to provide data useful in meeting the requirements of Cease and Desist Orders. In particular, information is needed concerning the area affected, concentrations, and rate and direction of movement of the plume of contaminated ground water. If Brightons municipal well field will be affected, the model may be used to determine future arrival times and concentrations. The study is being undertaken in two phases. Phase I involves the conversion of the existing chloride transport model of the arsenal to a DIMP transport model in order to evaluate the magnitude of the ground-water contamination in the immediate area of the arsenal. Phase II involves building a second DIMP transport model of a larger area in order to investigate the potential for DIMP moving into Brightons well field and other adjacent areas. Both models will assume conservative nonreactive transport of DIMP and will be calibrated using present data on DIMP concentrations in the aquifer. This report documents the results of Phase I

Subject Categories:

  • Organic Chemistry
  • Hydrology, Limnology and Potamology
  • Logistics, Military Facilities and Supplies
  • Environmental Health and Safety

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