Figure 6: Use of modeling software for information and guidance (expressed as percentages of total responses for each category)- MODFLOW: U.S. Geological Survey Modular Three-Dimensional Groundwater Flow Model; MTRD: a 3D contaminant transport model for simulating the dynamics of dissolved constituents in groundwater flow systems; RT3D: another software package for simulating three-dimensional, multispecies, reactive transport in groundwater; MT3DMS; an enhancement of MTRD enabling Multi Species application; BIOPLUME III: a 2D finite difference model for simulating natural attenuation of organic contaminants in groundwater