[Code of Federal Regulations]

[Title 40, Volume 26]

[Revised as of July 1, 2006]

From the U.S. Government Printing Office via GPO Access

[CITE: 40CFR280.72]



[Page 525]

 

                   TITLE 40--PROTECTION OF ENVIRONMENT

 

         CHAPTER I--ENVIRONMENTAL PROTECTION 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.