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BACKGROUND: <br /> Sanitary Sewer Priorities <br /> Under the direction of the City Council, the Public Works Department has established four priorities <br /> to improve the City's sanitary sewer collection system as defined in the Sanitary Sewer Master <br /> Plan. <br /> 1. Critical Large Diameter Sewer Rehabilitation. <br /> 2. Sanitary Sewer Overflows Due to Inflow and Infiltration. <br /> 3. System Operation and Maintenance. <br /> 4. Small Diameter Sewer Rehabilitation. <br /> The Annual Sanitary Sewer Inspection Program addresses all of the sanitary sewer priorities <br /> identified by the City Council. Televising is needed to find deteriorated pipes for large and small <br /> diameter sewer rehabilitation. Televising also assists with operation and maintenance by finding <br /> areas that need to be cleaned because of roots and other debris. All of the above mentioned <br /> televising assists in inflow and infiltration reduction efforts. <br /> Pipeline Inspection Services <br /> Pipeline inspection services have proven invaluable in locating problems and answering questions <br /> that arise in the normal maintenance of the City's sewers along with ongoing condition assessment. <br /> Major work items are detailed below: <br /> 1. Sewer Line Inspections: This work is performed through the insertion of a motorized camera <br /> unit that is driven through sewer lines in order to determine the condition of the line. This <br /> information assists staff in preparing improvement projects or identifying maintenance needs. <br /> 2. Sewer Cleaning: Sewer cleaning is a critical component in providing and preserving full <br /> capacity within the sewer system. The cleaning process will remove all debris, grease and roots <br /> from the sewer by use of high water pressure and cutting heads. All accumulated debris will be <br /> vacuumed out of the sewer system. Combining cleaning with televised inspection has proven to <br /> be very effective in assuring clean sewer lines and an optimal inspection. <br /> 3. Manhole Inspections: Manholes are often a weak link in the sewer system in that they are <br /> direct access points from the surface to the sewer system. Many manholes are located on streets <br /> and are subject to traffic loads and heavy storm water inflow. These forces often have a <br /> significant effect on the structural integrity of a manhole and the sewer system in general. A <br /> major step in improving the overall reliability of the City's sewer system, and decrease storm <br /> water inflow, is to gain information on the manhole condition and make the necessary <br /> improvements. <br /> 4. Smoke Testing: This work involves blowing smoke through a sewer line to determine if there <br /> are holes in the line that allow storm water to flow into the line causing sewer overflows. <br /> Smoke testing can also be used to identify illegal sewer connections and damaged pipes. <br /> 5. Manhole Rehabilitation: A unit price is provided to repair damaged manholes without going to <br /> the expense to replace them. If manhole deterioration is caught early enough, a significant <br /> amount of time and money is saved by lining the manhole to restore its structural integrity. <br /> Page 12 <br />