The city of Grass Valley is extending the life of the city’s existing sewer pipes by as much 30 years according to Grass Valley Senior Engineer Trisha Tillotson. By lining the existing clay pipes beneath city streets with plastic liners, the city won’t have to tear up streets, and is saving time and money in the process. Over the years cracks in the pipes have allowed rain water into the sewer pipes, increasing the amount of fluid at the treatment plant which ends up increasing the cost of treatment. Tillotson says they have already placed the liner in some areas of the city and plan to do more in the coming months.
“The next project will likely be a sewer main from Kate Hayes to Mainhart Drive, and then in Kate Hayes Street and then we also have some lift station projects; one we’re working on on Joyce Drive and one coming up is Railroad Avenue and another is Freeman Lane.”
The process places a plastic material into the existing main pipe and then using forced air to push it through and hot water run through the hose to make the material of the liner adhere to the existing pipe. Then a robotic camera will be used to identify where access holes will need to be made and check for fit of the new liner. Tillotson says sewer rates are not affected by the project.
“These projects were identified in the user rate and impact fee program, so that’s what we’re doing, we’re implementing the projects that were already identified and we’re already paying for.”
The cost of the project is around $1.16 million with work being completed by Michels Corp. of Salem, Oregon.