MENDHAM SEWER SYSTEM
LOCATION: MENDHAM, NJ
CLIENT: BOROUGH OF MENDHAM
MARKET SECTOR: PUBLIC
SIZE: 125,000 LF
The Borough of Mendham wanted to eliminate extraneous groundwater flows that were seeping into its sewage collection system, and hired PS&S to implement an evaluation and sewer rehabilitation program.
Due to excessive infiltration and inflow (I/I) in the sewerage system, the Borough’s wastewater treatment plant intermittently exceeded its New Jersey Pollutant Discharge Elimination System (NJPDES) permitted flow quantity during wet weather conditions, requiring the plant to perform at a greater efficiency to meet loading limitations. These flow occurrences necessitated the implementation of stream studies and NJPDES permit modifications, as well as the imposition of a ban on new connections into the Borough’s system. If the extraneous I/I could be reduced, the strain on the treatment plant could be relieved, and the sewer ban could be lifted, thus allowing additional connections into the system.
THE PS&S SOLUTION
PS&S developed a three-phase sewer rehabilitation program which involved cured-in-place lining and manhole rehabilitation. PS&S prepared detailed plans and specifications for the rehabilitation work, assisted the Borough during the public bidding process, and oversaw the cured-in-place lining of approximately 37,000 linear feet of sewer and rehabilitation of numerous manholes.
This project reduced extraneous groundwater flows into the system that were previously processed as raw sewage at the wastewater treatment plant and discharged as treated effluent into Ironia Brook, a Category 1–Trout Production Stream.