Guide for Safety with Underground Services.

This document replaces an earlier version, and sets out agreed
work methods and preferred work practices for the location
and excavation of underground services. As such, the
document should assist those who have responsibilities under
the Health and Safety in Employment  Act 1992.

Linkback: https://www.plumbers.nz/codes-standards-health-and-safety/10/guide-for-safety-with-underground-services/1062/