OPSS 401 Trenching, Backfilling and Compacting
OPSS 402 Excavating, Backfilling and Compacting for Maintenance Holes, Catchbasins, Ditch Inlets and Valve Chambers
OPSS 403 Rock Excavation for Pipelines, Utilities and Associated Structures in Open Cut
OPSS 404 Support Systems
OPSS 405 Pipe Subdrains
OPSS 406 (Withdrawn*, Repl by OPSS 410) Pipe Sewer Construction by Open Cut Method (MTC) - Cancelled
OPSS 407 Maintenance Hole, Catch Basin, Ditch Inlet and Valve Chamber Installation
OPSS 408 Adjusting or Rebuilding Maintenance Holes, Catch Basins, Ditch Inlets, and Valve Chambers
OPSS 409 Closed Circuit Television (CCTV) Inspection Of Pipelines
OPSS 410 Pipe Sewer Installation in Open Cut
OPSS 411 Cleaning and Flushing of Pipe Sewers, Catch Basins, Maintenance Holes, Ditch Inlets, and Oil-Grit Separators
OPSS 412 Sewage Forcemain Installation in Open Cut
OPSS 413 Manure Pipeline Installation in Open Cut
OPSS 415 Pipeline Installation by Tunnelling
OPSS 416 Pipeline and Utility Installation by Jacking and Boring
OPSS 421 Pipe Culvert Installation in Open Cut
OPSS 422 Precast Reinforced Concrete Box Culverts and Box Sewers in Open Cut
OPSS 441 Watermain Installation in Open Cut
OPSS 442 Cathodic Protection of New and Existing Watermains
OPSS 450 Pipeline And Utility Installation In Soil By Horizontal Directional Drilling
OPSS 460 Pipeline Rehabilitation by Cured-In-Place Pipe
OPSS 462 Cement Mortar Lining of Watermains
OPSS 463 Pipeline and Conduit Installation by Pipe Bursting
OPSS 490 Site Preparation For Pipelines, Utilities and Associated Structures in Open Cut
OPSS 491 Preservation, Protection and Reconstruction of Existing Facilities
OPSS 492 Site Restoration Following Installation of Pipelines, Utilities and Associated Structures in Open Cut
OPSS 493 Temporary Potable Water Supply Services
