Groundwater Flow/Contaminant Transport Modeling

Geological Services, Inc. has specialized in ground water modeling studies for some 25 years, and has completed models throughout the State of Pennsylvania as well as West Virginia and new Jersey.  In all cases, GSI models have been approved by state agencies including PA DEP, NJ DEP, SRBC and others.  Additionally GSI models have been used successfully in courts of law at all levels in the states of Pennsylvania, New Jersey, and West Virginia.

While ground water models can be expensive to create, GSI maintains a complete file of calibrated agency approved models that can be easily modified to include nearby areas, or to zoom-in on specific areas to complete site specific studies where required by the individual project objectives.  Since GSI models are constructed on a regional scale to assess conditions within the surface water drainage basin in which a given site lies, our portfolio of existing models covers hundreds of square miles within the Mid-Atlantic region.  From these models, detailed site specific models are created as a subset of the parent model allowing highly detailed, reliable quantitative assessments at the site specific scale.  Best of all, since the lions share of the background work is already completed and peer-reviewed, GSI is able to complete modeling studies at a fraction of the cost required to construct a new model in the absence of a reliable regional and local modeling data base.  The locations of just some of our many modeling studies are shown below.

Groundwater flow and contaminant fate and transport modeling provides a clear mathematically precise means of evaluating ground water systems on both regional and site specific scale.  Groundwater models can be used for a broad range of project objectives including:

  • Groundwater availibility determination - How much groundwater is available within a given area that can be developed for public, industrial or residential water supplies?
  • Groundwater resource management and protection -Safeguarding existing municipal and industrial groundwater supplies from contaminat impacts and source depletion
  • Groundwater impact assessment- Determination of the degree to which well operation on a given property has been affected by groundwater use on adjacent properties.  Such impacts may include:
    • New well development
    • Overpumping
    • Quarry operation
    • Site regrading/storm water drainage modification
  • Contaminant fate and transport studies - Determination of contaminant behavior has many applications including:
    • Determination of the timing of a contaminant release, and the past, present and future impacts in terms of areal extent and the magnitude of the impact
    • Contaminant source area identification - The origin of contamination, nature of the release, and responsible party identification
    • PA DEP Act 2 Site Specific Closure pathway elimination studies