Our key personnel have specialized in ground-water hydrology since 1979, when we were involved in a trona tailings pond leakage problem that was causing dissolution of gypsum from bedrock fractures.

Our areas of expertise in the physics of ground-water flow include:

• saturated & unsaturated flow modeling using finite element and finite difference techniques
• flow to wells using closed-form solutions for constant flow and constant head conditions
• pumping tests considering the effects of leaky aquitards, delayed yield and well-bore storage
• advection-dispersion modeling
• tracer test evaluations

Our areas of expertise in ground-water chemistry include the subsurface behavior and transformation of:

• major ions (inorganics)
• metals and metalloids
• organic compounds (both light and heavy hydrocarbons)
• radionuclides

We have solved some relatively difficult problems using the principle of super-position, such as the probability that organic contaminants will be successfully captured by a line of large diameter, open-ended wells and the concentration history of contaminants from slug releases at varying distances from the point of release.