Saratoga Springs could become smelly if something isn't done soon.
The Timpanogos Special Service District met Thursday night and discussed a critical corrosion problem happening in some of the sewer's pipes, which could cost millions of dollars to fix.
A buildup of hydrogen sulfide gas, which creates sulfuric acid, has eaten away the top of the sewer pipe in several areas of the pipeline from Saratoga Springs to Lehi.
The pipes aren't in danger of overflowing. The gas is created from slow-flowing wastewater through the pipe, which allows solids to fall to the bottom of the pipe and creates the gas. Larry Bowen, district engineer, said the pipe is carrying only 20 percent of the carrying capacity volume. The corrosion takes place at the top of the pipe and works its way down.
The TSSD hired a consulting firm to look at the problems in the pipe and make recommendations for fixing them, Bowen said. The company, Odor and Corrosion Technology Consultants Inc., took samples of the acidity levels, measurements of the amount of concrete lost and air velocity and measurements of gas, air and wastewater sulfide content. OCTC's main recommendation for fixing and controlling the corrosion issues was to rehabilitate the line, Bowen said.
A chemical spray can be sprayed on the 11-year-old pipes that will attach to the top of the pipes and slow done corrosion levels. Bowen said it "doesn't last forever, but it will help right now."
OCTC also recommended new pumps at two lift stations before the water flows into the plant and adding chemical feeds to the pipes. To rehabilitate the problem areas and fix the lift stations would cost approximately $15 million.
Bowen said the $15 million fix would be the "most reasonable thing to do" but admitted it was hard to say if it was the best solution.
He said it's difficult to project the rate of corrosion in the long section of line. "If we slow it (corrosion) down enough it (the pipe) could last another 20 years or longer.
"I can guarantee you if we do what we've been talking about feed chemical and change environments I can guarantee the rates will slow down," Bowen added.
Board members for the TSSD recommended that both the finance committee and the engineering committee examine what the district can do to fix the problem. Garland Mayne, district manager, said the solution to the corrosion problem will need to be figured out sometime within the next two months so work can begin.Because the project is considered rehabilitation, fee income cannot be used to pay for the project.