Sanitary Sewer Rehabilitation

Cochichuate Aqueduct Sanitary Sewer Rehabilitation

The City of Newton selected Weston & Sampson to perform an inventory of conditions on the Cochituate Aqueduct. The Cochituate Aqueduct is a 26,036 linear foot sanitary sewer interceptor in service since 1952. The purpose of the project was to document the existing condition of the interceptor and interceptor manholes, perform a hydraulic capacity analysis, and provide recommendations for repairs. We identified hydraulically limiting pipe segments, a section of 48-inch reinforced concrete pipe severely deteriorated by hydrogen sulfide, and several other pipeline and manhole defects.

The city subsequently selected Weston & Sampson to design rehabilitations, prepare plans and specifications, and provide construction engineering services for the rehabilitation of the defects. The design focused on the installation of a 1,015 linear foot, 48-inch, cured-in-place liner. The project included:

  • 1,015 linear feet of 48-inch CIPP
  • Bypass pumping plan
  • Access to work site plan
  • Hydrogen sulfide monitoring
  • Rehabilitation of three sanitary sewer manholes
  • Cutting of one protruding service connection
  • Installation of one permanent ultrasonic flow meter
  • Design and installation of the 48-inch cured-in-place liner was particularly challenging for the following reasons:
  • Weight limits associated with bringing the liner to the site
  • Long length between manhole access (approximately 2,000 linear feet)
  • “Blind shot” liner installation (i.e., liner installation did not terminate at a manhole)
  • A 1,400 linear foot road was constructed to provide access to the installation manhole
  • Bypass pumping of up to 6.0 million gallons per day (mgd)


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