[en] As part of the Basalt Waste Isolation Project (BWIP), two Exploratory Shafts, called ES I and ES II, will be sunk to a depth of 3400 ft by the blind boring method. The shafts' steel liners will have a design life of ∼100 years. The carbon steel and the high-strength low-alloy steel (ASTM A588) materials to be used are expected to be exposed to a moist air atmosphere on the interior liner surface that will result in a zone continuous wetting. The exterior surface of the liners will be exposed to a layer of grout and possibly groundwater, should there be a discontinuity in the grout. A set of environmental conditions were selected and corrosion rate studies were performed on carbon steel and high-strength low-alloy steel, to evaluate possible corrosion effects. 21 refs., 5 figs