Gravity Sewer Amplification

About the project

Pensar was engaged to repair damage to existing gravity sewer pipework which was causing repeated blockages. With the site located within a car park, access was tight with high stakeholder impact.

Key Capabilities

Sewerage repair, water and wastewater

Project Location

West Gosford, New South Wales

Client Name

Central Coast Council

Project Duration

September 2020 - October 2020

Project scope

  • Excavation and installation of a new gravity sewer with DN225 pipework
  • Installation of three new 1050mm sewer manholes
  • Installation of a DN400mm 60m micro tunnel, install carrier pipework and grout fill
  • Completed two new live sewer manhole connections
  • Dewater excavations of ground water
  • Restored the car parking area and line marking

Challenges

  • Completing the micro tunnel under multiple services including 11kva power cable to a local substation
  • Dewatering of all open excavations and meeting discharge requirements
  • Site constraints due to the works being completed in an operating car park and business precinct
  • Delivery of the project in a short timeframe to meet all stakeholders’ requirements
  • Multiple sewer bypasses were implemented to complete critical live sewer connections

Achievements

  • Zero incidents during the delivery of works
  • Successful delivery of a 60m micro tunnel and installation of new gravity sewer pipework and manholes
  • Zero complaints from local businesses or community members due to efficient communication and site management
  • Multiple sewer bypasses were implemented to complete critical live sewer connections
  • Worked closely with the Central Coast Council to meet project timeframes and deliverables
  • Zero sewage spills or environmental incidents