This drilling plan covers the drilling of 2 or 3 slim (2-7/8 inch diameter) cored exploratory holes and was prepared by the Boise Geothermal R&D Project of the Idaho National Engineering Laboratory. The document provides a basic plan for the development of the exploration drilling phase of the Boise Demonstration Space Heating Project. The drilling plan outlines the areas of responsibility during the hole drilling and a schedule of activities to accomplish the primary objective - confirmation of the geothermal resource model through exploration hole drilling. Further effort is planned to accomplish the following: 1) demonstration of the resource through the drilling of a larger well and 2) recommendations for production well sites for drilling by the State of Idaho through knowledge gained from the exploration holes and demonstration well