and made to measure offsite, then carefully secured to the prepared metal walls inside the tank. Additional works were carried out to provide a higher security rating and internal metalwork was replaced following our onsite inspection. For Scottish Water, a recent project in the Central Belt allowed the Mackenzie Construction team to showcase its agile and responsive service. Works were to be carried out over the live cell due to network constraints, however, following removal of the overburden and the existing membrane, it became apparent that there were cracks and voids which were allowing ingress into the tank below. The focus of the scheduled programme of repairs had to then be altered to prioritise and manage the immediate threat to water quality. Repairs were then time critical, and it was crucial that the repair materials fully complied with Regulation 31, as they would be used both within and outside of the asset.
Although more expensive epoxy repairs mortars were chosen to reduce the time impact, the trade-off of cost against any risks to the network was never a decision to be taken lightly. The tank was drained to allow the works to proceed, and the repair works were quickly identified and carried out using the Reg.31 approved repair mortars. Strict DOMS procedures were followed throughout and, once complete, the full regulation 31 curing time was observed. All data was recorded within the inspection and test plan to provide vital evidence of compliance. Immediately following the completion of the additional internal repairs and respective curing period, the asset was cleaned down and chlorinated, prior to being re-filled with water. We developed proposed methods and procedures for the application of the liquid applied membrane over the live tank with the client. To ensure working methods would present no risk to water quality, we proved the integrity
of the newly repaired tank structure through forensic flood testing, with no ingress of water detected. The final stage of the project - the application of the liquid roofing membrane was completed safely and in full compliance with all standards and regulations Mackenzie Construction’s Managing Director, Andy Dalrymple, said “In the water sector specifically, our view is that business efficiency and overall performance can be improved through the establishment of best practice and the pursuit of opportunities for innovation. This is of particular importance as we focus on the path towards net zero carbon and where we are committed to supporting our water industry clients with their sustainability targets.”
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