




	January 2009 Federal Stimulus Funding Sanitary Sewer Rehabilitation WDNR Grant Applications Due April 15th Current Issue www.AyresAssociates.com Subscribe		Sanitary Sewer Rehabilitation (January 2009)
			Knowing the age, material, and condition of your existing sanitary sewer collection network is the first step to understanding the impacts. Aging clay tile pipe can allow wastewater to exfiltrate out of the collection system and allow groundwater to infiltrate into the collection system. Wastewater leaving your system is a threat to the environment and can cause contamination. Groundwater coming into your system increases flows through your pipe network, to lift stations, and to your treatment plant, increasing your lift station operation and maintenance costs and increasing your treatment costs. A quick way to review your system is to look at the total yearly wastewater billing volume and compare it to the total yearly inflow volume metered at your treatment plant. This will provide an estimate of what volume is lost or gained in your wastewater collection system. Sanitary sewer pipe rehabilitation could save you money. Placing a cured-in-place pipe liner inside of your existing sanitary sewer pipe, rather than replacing the pipe, could cost you as little as $50 per linear foot, rather than $125 per linear foot for open trench pipe replacement. This investment can reduce future maintenance costs for your collection pipes, reduce exfiltration and infiltration, and could result in less wastewater requiring treatment. Sewer rehabilitation can be good for the environment and good for your pocketbook.