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POSITIVE RESPONSE: A positive response is a communication with a ground
disturber that takes place prior to excavation. This action is to ensure all
contacted facility owners/operators (typically via the one-call centre) have
located their underground facilities and have appropriately marked any
potential conflicts within the areas of planned excavation.
PRE-MARKING OR POSITIVE SITE IDENTIFICATION: These are markings
used in accordance with the American Public Works Association guidelines to
identify the proposed excavation site or work area.
SUBSURFACE UTILITY ENGINEERING (SUE): This term refers to an
engineering process for accurately identifying the quality of the underground
utility information needed for excavation plans and for acquiring and managing
that level of information during the development of a project.
SURVEY INFRASTRUCTURE: Survey infrastructure refers to property
boundary monuments and control survey monuments.
TEST HOLES: The process of test holes is a means of exposing a facility by
using a safe method or practice (non-destructive) to determine the precise
horizontal and vertical position of an underground line or facility.
Tolerance zone is the space in which a facility is located, TOLERANCE ZONE:
and in which it is necessary to take special care.
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