[Code of Federal Regulations]
[Title 40, Volume 30]
[Revised as of January 1, 2007]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR761.257]

[Page 742-743]
 
                   TITLE 40--PROTECTION OF ENVIRONMENT
 
         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 761_POLYCHLORINATED BIPHENYLS (PCBs) MANUFACTURING, PROCESSING, 
 
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.  761.257  Determining the regulatory status of sampled pipe.

    (a) For purposes of removal for disposal of a pipe segment that has 
been sampled, the sample results for that segment determines its PCB 
surface concentration. Determine the PCB surface concentration of a 
segment which was not sampled as follows:
    (1) If the unsampled pipe segment is between two pipe segments which 
have been sampled, assume that the unsampled segment has the same PCB 
surface concentration as the nearest sampled pipe segment.
    (2) If an unsampled pipe segment is equidistant between two pipe 
segments

[[Page 743]]

which have been sampled, assume the PCB surface concentration of the 
unsampled segment to be the arithmetic mean of the PCB surface 
concentrations measured in the two equidistant, sampled, pipe segments.
    (b) For purposes of abandonment of a pipeline section, assume that 
the PCB surface concentration for an entire pipeline section is the 
arithmetic mean of the PCB surface concentrations measured at the ends 
of the pipeline section. If additional representative samples were taken 
in a pipeline section, assume that the PCB surface concentration for the 
entire pipeline section is the arithmetic mean of the concentrations 
measured in all representative samples taken.
    (c) For purposes of removal for disposal under Sec.  
761.60(b)(5)(ii)(A)(1) or abandonment under Sec.  761.60(b)(5)(i)(B), if 
the surface PCB concentration of a pipe segment, determined by direct 
measurement or in accordance with paragraph (a) of this section, or of a 
pipeline section as determined in accordance with paragraph (b) of this 
section, is 10 [micro]g/100 cm\2\, but <100 [micro]g/100 
cm\2\, then that segment or section is PCB-Contaminated.