1. Computer Modeling Vadose Zone Models Groundwater Flow Model
Solute Transport Model

2. Vadose Zone Models
Vadose zone models are used to quantify the amount of contaminant loading to the groundwater system
The analytical or numerical models may be used (e.g., HYDRUS-1D)
HYDRUS-1D simulates the one-dimensional movement of water and chemicals in unsaturated soil.

3. Groundwater Flow Model
Groundwater flow will be simulated for the Groundwater basin(s) associated with the agricultural land of Vieques.
Groundwater flow will be simulated using the numerical model MODFLOW
Pre and post processing will be accomplished using GMS.

4. Model Development Spatial characteristics Grid design
Initial conditions
Boundary conditions
Steady-state
Transient

5. Model Development-cont.
Model Calibration
Steady-state
Transient
Sensitivity Analysis
Model validation
Particle Tracking

15. Solute Transport Modeling
Identification of sites to be modeled
Selection of contaminants to be modeled
Solute transport model development
Grid spacing and time step requirements
Initial and boundary conditions
Transport model calibration and sensitivity analysis

17. Surface Water Modeling
Watershed Management System (WMS)
ARCView Compatible
User-friendly interface for creating numerical watershed models.
Hydrologic System Program Fortran (HSPF)
Simulates for extended periods of time the hydrologic, and associated water quality, processes on pervious and impervious land surfaces and in streams and well-mixed impoundments

18. Development of a Watershed Model

19. Evaluation of Remedial Alternatives
No-Action Alternative
Various alternative will be considered.

20. Reporting Periodic status report Final Report
Publications and presentations at professional meetings
Publications in peer reviewed journals