HYDROLOGIC MODELS

Since 1990, the use of hydrologic models has risen dramatically. Hydrologic modeling has become an essential management tool for professionals involved in remedial processes and environmental investigations.

Parsons has considerable experience in the development and application of numerical groundwater flow and solute transport models. Typical problems for which we have effectively applied numerical models include:

• Optimizing remedial designs such as recovery well locations, pumping rates, and screen depths
• Estimating safe yield and long-term yield of production wells
• Simulating leakage through landfill liners
• Simulating contaminant fate and migration
• Estimating time to achieve cleanup
• Evaluating the impact of soil contamination on groundwater
• Evaluating light nonaqueous phase liquid migration and designing LNAPL recovery systems.
• Evaluating treated wastewater disposal options, including lagoons, infiltration beds, and spray irrigation fields.

Parsons uses the following models: AT123D, BIOSCREEN, PLUME2D and PLUME3D, PTC, QUICKFLOW/WINFLOW, SUMMERS, WHPA, MODFLOW 386, MODPATH 386, MT3D, MOC 386, PLASM, RANDOM, SUTRA, VLEACH, BIOPLUME II in either a DOS, Windows, or UNIX operating systems.

Representative projects include:

• Modeled the migration of fluoride in Palm Beach County, Florida, using MOC
• Modeled the fate and transport of arsenic and heavy metals, generated by a Montana smelter
• RCRA Corrective Action Program for Sikorsky Aircraft Corporation in Stratford, Connecticut
• Groundwater flow and solute transport model for the U.S. Air Force Space Command
• National Pollutant Discharge Elimination System Permit Mixing Zone Demonstration at the Savannah River Department of Energy site
• Transport model of the aquifer system at Fernald, Ohio

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