Valley Sanitation District, located in Arapahoe and Denver Counties, has 0.75 miles of critical wastewater collection pipe (the Interceptor Sewer) suffering from significant internal corrosion, which puts the line at risk of structural failure and collapse.
Approximately 0.75 miles of this sewer pipe has not been rehabilitated because it is located within an abandoned landfill and is buried 50 feet deep. Additionally, the location of this pipe within the landfill has resulted in methane and other hydrocarbon gases leaking into the pipe, at times reaching levels that could result in an explosion or fire within the pipe. All of these issues makes operation and maintenance of this segment of the pipe extremely dangerous and nearly impossible.
The District has conducted an extensive analysis to determine how to solve this pressing problem. With the help of an engineering consultant, they decided the best path forward is to construct a wastewater pumping station and a new sewer pipe – both located outside of the abandoned landfill.
The new pumping station would be located in a parking lot currently owned by the City of Englewood. The new sewer pipe would run along South Federal Boulevard to South Clay Street and then turn east along West Oxford Avenue, ending at an existing manhole just west of the South Platte River. At the moment, this option also has the lowest overall cost. Current estimates put the cost of this project around $2,700,000.
The District’s customers are at risk of a catastrophic failure of the sewer pipeline located within the closed landfill. Failure of the pipeline would result in untreated wastewater contamination of private properties and the South Platte River. Were a failure to happen before this project is completed, customers would be without sewer service for a period of time until temporary bypass pumping is put in place. Control of this failure and the resulting wastewater discharge would likely take days. Permanent repairs would take weeks to complete and be tremendously expensive.
The District’s Board of Directors is pursuing a low interest loan from the Colorado Water Resources & Power Development Authority to enable the District to begin the relocation of the interceptor sewer in 2018. Repayment of the loan would require voter approval of an annual property tax increase so the District can repay the loan in the necessary timeframe.
The upcoming election on November 7 will include a ballot question (Issue 4A) regarding how to fund this Project. All registered voters within the District’s service boundaries are encouraged to read the mailed TABOR notice. Information on the District’s ballot question begins on page 19 of the Arapahoe County Election Notice. For voters within the City & County of Denver, the District’s Election Notice will be mailed directly to you.
More information on this project can be found online at the District’s webpage.