The tanks were then retested with similar results! A lining contractors nightmare!
The tanks were then progressively emptied and carefully monitored. It was established that there was a possibility that the Cascade Clamp make-off to the stub columns could be
the source of the problem. After extensive discussions with the clamp suppliers, it was decided to eliminate the ‘step’ between the 2mm HDPE liner and the upper concrete
surface by placing a 2mm thick gasketting bandage directly above the top edge of the liner. The clamp was then reinstalled with the new “bandage” ensuring that the clamps
were not distorted by the liner “step”.
Hey, Presto! No leaks (and thankfully no more additional costs!)
Aquatan Lining Systems would sincerely like to thank the Project Team of ARQ Consulting Engineers and Grinaker/LTA for their assistance and co-operation and the Client, ERWAT for their patience and understanding during the lengthy investigation period. This was certainly a case of, if at first you don’t succeed, try, try and try again!