It is interesting to note that since the 1950's, about 3-5 inches has been lost from the walls because of the etching by hydrogen sulfide gas. Not to worry - the walls are more than a foot thick. Walls will first be sandblasted to sound structure, mortar and cement will be applied, and then a patented top coat will be applied that is impervious to water, gasses, oil and acids. Service will not be interrupted. It is also interesting that the receiving oxidation pond is a model of efficiency.
Many treatment plants require three eight-hour shifts every day all year.
Ours has only to be monitored once a day and samples taken, and meets or exceeds government standards for purity in the discharged water. The system handles about 900,000 gallons on a standard dry day, but rainfall and infiltration into the lines can exceed two million gallons. Because of the age of the lines, Opedenhoff hopes to get a system that will inject smoke into the lines to detect leaks and breaks, and a line camera for better identification and location of problems. So there you have it. More adventures, and more improvements.