The risk analysis indicated that if the slope failed, it would affect the major transportation routes around the dam. To collect more information about the slope conditions, field investigations including geological mapping, boreholes and joint surveys were performed. A series of laboratory tests were conducted on core specimens to obtain the engineering properties of rock. Initial examination of core size and its mass was performed to determine rock density. For each type of rock, laboratory testing was conducted to determine its engineering properties. Intact specimens of sandstone collected at a depth of 2 m were used for a series of triaxial tests. The objectives of the project are to establish the geological setup of the site, determine the rock mass properties, estimate slope stability along the A-A' line, perform rock fall hazard assessment and discuss geotechnical issues that may occur during tunnel construction.