[Code of Federal Regulations]
[Title 40, Volume 30]
[Revised as of July 1, 2005]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR761.250]

[Page 709]
 
                   TITLE 40--PROTECTION OF ENVIRONMENT
 
         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 761_POLYCHLORINATED BI PHENYLS (PCBs) MANUFACTURING, PROCESSING, 
DISTRIBUTION IN COMMERCE, AND USE PROHIBITIONS--Table of Contents
 
Subpart M_Determining a PCB Concentration for Purposes of Abandonment or 
  Disposal of Natural Gas Pipeline: Selecting Sample Sites, Collecting 
        Surface Samples, and Analyzing Standard PCB Wipe Samples
 
Sec. 761.250  Sample site selection for pipeline section abandonment.

    This procedure is for the sample site selection for a pipeline 
section to be abandoned, in accordance with Sec. 761.60(b)(5)(i)(B).
    (a) General. (1) Select sample collection sites in the pipeline 
section(s) by following the directions in paragraph (b) of this section.
    (2) Select the proper sampling position along the pipe by following 
the directions in Sec. 761.247 (c) and (d).
    (3) Assure, by visual inspection, the absence of free-flowing 
liquids in the pipe by affirming no liquids at all liquid collection 
points and all ends of the pipeline section to be abandoned.
    (b) Selection sample collection sites. At a minimum, sample all ends 
of all pipeline sections to be abandoned in place.
    (1) If the pipeline section to be abandoned is between the pressure 
side of one compressor station and the suction side of the next 
compressor station downstream of the former gas flow, at a minimum, 
sample all ends of the abandoned pipe.
    (2) If the pipeline section to be abandoned is longer than the 
distance between the pressure side of one compressor station and the 
suction side of the next compressor station downstream of the former gas 
flow, divide the pipeline section, for purposes of sampling, into 
smaller pipeline sections no longer than the distance from the pressure 
side of one compressor station to the suction side of the next 
compressor station downstream of the former gas flow. Consider each of 
the smaller sections to be a separate abandonment and sample each one, 
at a minimum, at all ends.
    (3) Use the following procedure to locate representative sample 
collection sites in pipeline sections at points other than the suction 
and pressure side of compressor stations, or the ends of the pipeline 
section to be abandoned.
    (i) First, assign a unique identifying sequential number to each 
kilometer or fraction of a kilometer length of pipe within the entire 
pipeline section.
    (ii) Use a random number table or a random number generator to 
select each representative sample collection site from a complete list 
of the sequential identification numbers.
    (iii) Samples may be collected by removing any covering soil, 
cutting the pipe to gain access to the sampling location, and collecting 
the surface sample with the pipe in place, rather than completely 
removing the pipeline sections to collect the surface sample.

[63 FR 35462, June 29, 1998, as amended at 64 FR 33762, June 24, 1999]