"Rio Blanco Oil Shale Project is conducting a surface and sub-surface Hydrologic Program to establish baseline hydrologic data and to supply the data required to design mine dewatering. RBOSP Progress Report 2 presented the hydrologic data obtained during the corehole drilling program. RPOSP Progress Report 3 presented the data collected during formal pump testing. This progress report will present continuing data collected from the hydrologic monitoring program, data from the drilling of monitor hole 5, as well as hydrologic interpretive analyses. Interpretive information based on data collected to date in this report includes recharge and leakage effects, permeability, apparent velocities, pizometric levels, transmissivity areal plots and Theis and Jacob plot analysis. In addition, areal distribution of selected chemical constituents are also plotted" --Leaf 1.