01-27-1992 Council Packet - Laserfiche WebLink

Home Browse Search

3. Avoidance of unnecessary treatment works capacity construction . 4. The reduction of total wastewater volume which must be treated. The I/I analysis# completed strictly for the southwest Orono collection system, determined that 32% of the total flow was infiltration/inflow. The study found that two districts within the study area were subject to potentially excessive I/I. These districts were analyzed from the cost effectiveness of transporting and treating the wastewater versus the location ard rehabilitation of I/I sources. It was determined that the cost of locating and rehabilitating the I/I sources would exceed the cost to transport and treat these flows. Based on the conclusions of the report# the following recommendations were made: 1, That the City of Orono initiate and carry out a continuous I/I identification and correction program. 2. That the City promote public awareness of the illegality and consequences of foundation drains discharging to the sanitary sewer system. Because the City of Orono sanitary sewer collection system has been constructed from a variety of piping materials and is located in variable ground water and topographic conditions# the City has developed an ongoing plan for abatement of infiltration and Inflow. This plan includes the following: 1. Routine and ongoing televising of the system. Where televising indicates sources of infiltration# chemical inj-^ction treatment is applied to the source to eliminate the infiltration. This procedure has proved especially effective in the older clay tile portions of the system which are subject to a relatively higher potential rate of joint failure and contain a relatively high number of joints. 2. Ongoing visual inspection of manholes# and installation of n.opr.n. lin.rs where they would prove effective In reducing infiltration.