Salem Sewer System Evaluation (SSES)
CM Archer is working with the City of Salem to perform a phased Sanitary Sewer System Evaluation (SSES). The initial phase will include detailed mapping of the entire collection system as well as hydraulic analysis and rehabilitation plan for Watershed No. 1.
Archer will perform field surveys necessary to locate horizontal and vertical locations of manholes. Depths of manhole flowlines will be recorded to provide the city with mapping of sewer lines.
Sewer flow monitoring of multiple locations to record actual flows in Watershed No. 1 over a two month period will take place during the fall of 2008. At that time, summarized flow data of the system including rainfall data obtained from the City's wastewater treatment plant will be compared to produce a hydraulic analysis of the Watershed No. 1 collection system, including evaluation of capacity bottlenecks in the system. The model will identify capacity limitations for each rainfall event.
Archer will also assist the Department of Public Works in performing manhole inspections throughout the City of Salem and provide direction and assistance to the city public works personnel during smoke testing in areas within Watershed No. 1. There will be an analysis of the field work included in inspections as well as city performed pipeline televised inspections. After the sanitary sewer system has been evaluated, a Watershed No. 1 collection system Rehabilitation Plan will be presented to the city for review which shall include necessary sizing and location of improvements to reduce inflow and infiltration in the system. The intent of the plan is to make the most cost effective improvements that will make the greatest impact on the peak flows of the system.