| http://www.w3.org/ns/prov#value | - The Keystone XL special condition pertaining to pipeline patrolling reads this way: Patrol the right-of-way at intervals not exceeding three (3) weeks, but at least twenty-six (26) times each calendar year, to inspect for excavation activities, ground movement, unstable soil, washouts, leakage, or other activities or conditions affecting the safety operation of the pipeline.
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