Environmental Services has postponed work on the Hillsdale East project until at least summer 2015. The delay will give project designers time to analyze the monitoring results from the first three pilot projects. Environmental Services installed devices in the three project areas to monitor how effectively repairs to public sewers and private laterals reduce inflow and infiltration.
Environmental Services will monitor results from the first three projects from summer 2014 through spring 2015. After this effectiveness evaluation, design staff will decide how to proceed with the Hillsdale East Project.
Environmental Services is working to reduce the possibility of sewage overflows in parts of southwest Portland. Pipes in some neighborhoods that carry sewage from homes and businesses can also fill with rain and groundwater during wet weather. This inflow of stormwater runoff and infiltration of groundwater can cause sewers to back up through manholes or household drains and threaten human health and the environment, and reduce the pipe’s capacity to carry sanitary sewage. Inflow and infiltration (I&I) also sends relatively clean water to the treatment plant and increases the cost of treatment.