City will replace 3 miles of sewer line
Decades of corrosion from a noxious gas has Lake Havasu City looking into replacing a section of iron sewage pipe along State Route 95.
According to agenda item 19-1953, the city is prepared to sign a contract with Phoenix-based Carollo Engineers for $163,772 to provide a detailed analysis of the hydraulic, economics and feasibility of various scenarios to ensure that the funds spent to not only repair the degrading pipe, but also improve the overall operation and ensure that city residents have a continuous working wastewater.
According to information from the city, the 8-inch main was installed in 1998 along with a 10-inch water line on the west side of the highway. The work was done before the city’s Wastewater System Expansion Program.
There have been many breaks on the sewer line over the years with three concurrent breaks happening between October and November of 2018. The breaks are due to corrosion issues caused by hydrogen sulfide, which attacks the iron pipe from the inside.
The city first looked at simply replacing the entire 2.7-mile section of iron pipe with its standard PVC C900 pipe. That section runs from Chenoweth Road to just north of Kiowa Avenue. The pump station is located on the east side of Route 95.
According to Assistant City Engineer Jeremy Abbott, the cost for that work would range from $1 to $1.5 million.
According to the city, the use of PVC pipe would eliminate the potential for damage from hydrogen sulfide completely.
But it also wanted to consider other alternatives, which could lead to the reduction of the amount of 8-inch main requiring replacement or rerouting the flows which would reduce pumping costs as well.
“We wanted to try and decrease that amount if it’s possible,” Abbott said. “The work would be paid for from the city’s Wastewater Enterprise Fund, sewer fees that are currently collected by the city. And those fees won’t go up.”
Abbott said the study would take about five months and the hope is to begin work before the end of 2019.
“Disruptions to traffic and businesses would be minimal because there is quite a bit of room to work there,” Abbott said. “Any work we would have to do on the east side, we would bore underneath the highway.”
Abbott said there wouldn’t be any disruptions to service because the new line would run parallel to the existing one. When work was completed, the transfer would be made to the new line.
The city council is scheduled to meet at 6 p.m. Tuesday, April 9.