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U.S. Department of Transportation U.S. Department of Transportation Icon United States Department of Transportation United States Department of Transportation

Interpretation Response #PI-04-0106 ([Natural Resources Engineering Company] [Mr. Joseph Peterson])

Below is the interpretation response detail and a list of regulations sections applicable to this response.

Interpretation Response Details

Response Publish Date:

Company Name: Natural Resources Engineering Company

Individual Name: Mr. Joseph Peterson

Location State: WI Country: US

View the Interpretation Document

Response text:


U.S. Department of Transportation
Research and Special Programs Administration
400 Seventh Street, S.W.
Washington, D.C. 20590

April 20, 2004

Mr. Joseph Peterson
GIS Specialist
Natural Resources Engineering Company
69 North 28th Street, Suite 27
Superior, WI 54880

Dear Mr. Peterson:

This is in response to your e-mail of March 29, 2004, in which you request an interpretation of the provisions of the Federal gas pipeline safety regulations at 49 CFR 192.5, Class locations, as it relates to the concept of clusters.

The original edition of the gas pipeline safety regulations at 49 CFR Part 192 (35 FR 13251; August 19, 1970) sought to address the problem that the class location scheme could create a two-mile stretch of higher class location solely to protect a small cluster of buildings at a crossroads or road crossing. To avoid this situation a new paragraph was added to allow adjustment of class location unit boundaries to address isolated clusters of buildings intended for human occupancy.

In the regulations the term, "cluster," is used in its ordinary dictionary sense, and has not been a significant source of misunderstanding. The dictionary meaning is: a number of similar things together, a bunch, a group.

The history of § 192.5 shows that the cluster exception applies only when all buildings in a one-mile class location unit are in a single cluster. If a class location unit contains buildings outside a cluster or more than one cluster of buildings, all buildings in the unit must be counted to determine the class location of the unit.

If you have any further questions about the pipeline safety regulations, please contact.


Richard D. Huriaux, P.E.
Manager, Regulations
Office of Pipeline Safety

Regulation Sections

Section Subject
192.5 Class locations