During the 2^nd quarter of 2020 (April – June 2021), TTCL’s site project, D-185, D-186, D-198, D-203, F-047, and F-052, proceeded preventive measures in site areas such as setting thermal scanner at the entrance of the project area and transportation van, recording the thermal scan results of all staff, and cleaning high-touch surfaces with disinfectant. These preventive measures were proceeded to prevent the spread of COVID-19 in pandemic situation.