EPACMTP is a fate and transport model developed by EPA to simulate the release constituents from waste managed in land disposal units, and the subsequent impacts of these constituents to the subsurface environment.

The model combines two modules to simulate one-dimensional downward flow and transport of constituents in the unsaturated zone beneath a waste disposal unit as well as ground water flow and three-dimensional constituent transport in the underlying saturated zone. The model is designed to run in a probabilistically or deterministic mode, and comes with built-in distributions of national and regional modeling parameters. The output of the model includes predicted concentrations of constituents arriving at a downgradient well under steady-state conditions or as a function of time. 

Model File:

• Executable EPACMTP Files (.exe) (10 MB)

Model Documentation:

• User's Guide for EPACMTP (PDF)(111 pp, 697 K)
• Parameters/Data Background Document for EPACMTP (PDF)(362 pp, 3 MB)
• Technical Background Document for EPACMTP (PDF)(490 pp, 9 MB)