This risk assessment document summarizes the hazards, risks, control measures, and residual risks associated with conducting trial trench excavations by hand to locate underground utilities at a construction site. Key steps include planning excavations based on utility drawings, scanning the work area to locate services, clearly marking identified and unidentified utilities, implementing traffic management plans if near roads, and using hand digging and excavators with spotters to expose utilities. Control measures such as permits, competent machine operators, exclusion zones around utilities, fall protection in trenches, illumination and signage are required. Residual risks include damage to undetected utilities and machine breakdown.