Page 69 - CCGA Best Practices Version English

4-35: Pre Demolition Verification Process

Practice Statement: The excavator/demolition contractor should have a
process to verify that all owner infrastructures, above and below ground,
are isolated and/or disconnected with confirmation from the owner prior to
demolition activities starting.
Practice Description: The excavation/demolition contractor shall receive
and review any required permits and ensure that all above and below ground
facilities have been isolated and/or terminated. This may include utility
locates, site inspection, obtaining confirmation/as built drawings from facility
owner.

4-36: Trenchless Excavation

Practice Statement: To prevent damages to existing facilities when
using Trenchless Excavation. Trenchless Excavation is a type of subsurface
construction work that requires few trenches or non-continuous trenches.
Trenchless Excavation includes such construction methods as tunneling,
micro tunneling (MTM), horizontal directional drilling (HDD) also known as
directional boring, pipe ramming (PR), pipe jacking (PJ), pneumatic piercing,
horizontal auger boring (HAB) and other methods for the installation of
pipelines and cables below the ground with minimal excavation.
Practice Description: Create a bore plan considering all affected facilities
prior to excavation. Request the location of underground facilities within
the work area including, but not limited to, the position of the excavation
equipment, the entrance pit, trenchless excavation path and the exit pit.
Physically expose all existing located facilities, both vertically and horizontally,
according to the facility owner’s specifications.

The excavation equipment operator or other competent person shall review
the utility locates and perform a site specific inspection, including walking
the entire proposed trenchless excavation path, prior to commencing work.
Findings shall be communicated to all relevant parties.

Proximity to all facilities should be considered at all times during the
installation process. The excavation equipment operator or competent person
shall maintain the bore path and confirm the minimum clearances established
by any affected facility owner. The installation process includes the pilot bore,
all pre-reaming passes and the final product installation. Means of tracking
trenchless excavations include electronic locating/guidance devices, pipe
lasers, water levels, etc.
When existing facilities are known to be present but are not exposed as a
result of local conditions, the facility owner and the excavator shall meet
to agree on how to safely proceed with the excavation. The trenchless
excavation operations shall stop if an abnormal condition, unknown

Canadian Common Ground Alliance
Best Practices Version 3.0 – October 2018
63