[Code of Federal Regulations]
[Title 40, Volume 26]
[Revised as of July 1, 2005]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR280.72]

[Page 486-487]
 
                   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

[[Page 487]]

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.