The assessment was conducted in two key stages. First, visible concrete defects were identified, classified by type, and quantified across the accessible surfaces of the wet well. Second, diagnostic testing and sampling were carried out to evaluate the condition of the concrete and surrounding environment.
Due to the nature of the asset—a fully enclosed sewage wet well with limited access via two hatches—specialised confined space entry procedures were required. Prior to inspection, the well was evacuated and thoroughly cleaned to ensure safe and effective access. ACC implemented comprehensive safety measures including fresh air injection, a winch system, harnesses, and gas analysis equipment, all under the framework of Hazardous Work Permits.