WAC 480-93-250
WAC 480-93-250. Damage prevention
Each gas pipeline company must comply with chapter 19.122 RCW, including:
(1) Subscribe to the appropriate one-number locator service;
(2) Provide, upon receipt of locate notice, reasonably accurate information as to its locatable underground facilities by surface-marking the location of the facilities;
(3) Respond with locate markings within two business days after receipt of the notice or within a time mutually agreed upon between the operator and the excavator requesting the utility locate information.