Practice Statement:

Multiple facilities in the same trench are marked individually and with corridor markers.

Practice Description:

In general, the number of lines marked on the surface equals the number of lines buried below. In circumstances where the total number of lines buried in the same trench by a single facility owner/operator may not be readily known, a corridor marker is used. The corridor marker indicates the width of the facility. (See Appendix B, “Uniform Color Code and Marking Guidelines.”)²⁰