[Code of Federal Regulations]
[Title 40, Volume 25]
[Revised as of July 1, 2004]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR280.72]

[Page 475]
 
                   TITLE 40--PROTECTION OF ENVIRONMENT
 
                           AGENCY (CONTINUED)
 
PART 280_TECHNICAL STANDARDS AND CORRECTIVE ACTION REQUIREMENTS FOR OWNERS 
AND OPERATORS OF UNDERGROUND STORAGE TANKS (UST)--Table of Contents
 
            Subpart G_Out-of-Service UST Systems and Closure
 
Sec. 280.72  Assessing the site at closure or change-in-service.

    (a) Before permanent closure or a change-in-service is completed, 
owners and operators must measure for the presence of a release where 
contamination is most likely to be present at the UST site. In selecting 
sample types, sample locations, and measurement methods, owners and 
operators must consider the method of closure, the nature of the stored 
substance, the type of backfill, the depth to ground water, and other 
factors appropriate for identifying the presence of a release. The 
requirements of this section are satisfied if one of the external 
release detection methods allowed in Sec. 280.43 (e) and (f) is 
operating in accordance with the requirements in Sec. 280.43 at the 
time of closure, and indicates no release has occurred.
    (b) If contaminated soils, contaminated ground water, or free 
product as a liquid or vapor is discovered under paragraph (a) of this 
section, or by any other manner, owners and operators must begin 
corrective action in accordance with subpart F.