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About This Item


Full Description

Provides a consistently applied decision making process for monitoring and observing of excavation and other activities on or near pipeline Rights-of -Way for "hazardous liquid" and "natural and other gas" transmission pipelines. ( Note: One call provisions and laws vary by state and it is the operator's responsibility to be familiar with and comply with all applicable one-call laws). This document's purpose is to protect the public, excavation employees, and the environment by preventing damage to pipeline assets from excavation activities.

Document History

  1. API TR 1166

    Excavation Monitoring and Observation, Second Edition

    • Most Recent
  2. API RP 1166


    Excavation Monitoring and Observation, First Edition

    • Historical Version

Amendments, rulings, supplements, and errata

  1. API 1166 Errata 1


    Errata for Excavation Monitoring and Observation, First Edition