Large sinkholes occurred in a residential suburb in the State of Kuwait, leading to destruction of properties and subsequently to partial evacuation of this residential area. From comprehensively conducted investigation programs, the sinkholes were attributed to the existence and propagation of Karst cavities in the limestone bedrock layer. Accordingly, a complete treatment program was adapted to reduce the risk of sinkhole recurrence by minimizing the possibilities of collapse in the upper level cavities within the limestone bedrock. In this project, two different cement grout mixes were designed and used for treatment of the Karst cavities; cavity filling grout and permeation grout. The assessment of the used mixes included regular evaluation of the compressive strength, slump, thermal conductivity, thermal resistance, bleeding, air content, loss of slump, flow and setting time. The treatment was followed by an evaluation program by drilling control boreholes. Some cores of the hardened grout were extracted from the control boreholes and their properties were evaluated and compared to those of laboratory specimens. This paper describes different types and mixes of cement grouts utilized in the ground treatment, elements of quality control program, and frequency and types of tests. Assessment of the results in addition to overview of the project is also presented. The results verified the efficiency of the different cement grout mixes used in this treatment project.