[Code of Federal Regulations]
[Title 40, Volume 30]
[Revised as of July 1, 2006]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR761.243]

[Page 708]
 
                   TITLE 40--PROTECTION OF ENVIRONMENT
 
         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 761_POLYCHLORINATED BIPHENYLS (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.  761.243  Standard wipe sample method and size.

    (a) Collect a surface sample from a natural gas pipe segment or 
pipeline section using a standard wipe test as defined in Sec.  761.123. 
Detailed guidance for the entire wipe sampling process appears in the 
document entitled ``Wipe Sampling and Double Wash/Rinse Cleanup as 
Recommended by the Environmental Protection Agency PCB Spill Cleanup 
Policy,'' dated June 23, 1987 and revised on April 18, 1991. This 
document is available from the TSCA Assistance Information Service, 
Environmental Protection Agency, 1200 Pennsylvania Ave., NW., 
Washington, DC 20460.
    (b) Collect a surface sample from a minimum surface area of 100 
cm\2\ at each sampling site selected. The EPA Regional Administrator may 
approve, in writing, requests to collect a sample from smaller surface 
areas, when <100 cm\2\ of surface eligible for sampling is present; 
e.g., when sampling a small diameter pipe, a small valve, or a small 
regulator. When smaller surfaces are sampled, convert the measurement to 
the equivalent measurement for 100 cm\2\ for purposes of comparison to 
standards based on 100 cm\2\.