### Question
How does ENERGY CONSERVATION AND RESOURCE RENEWAL define underground storage tank?


### Answer
Under *42 U.S.C. § 6991*, **underground storage tank** is defined as:

> any one or combination of tanks (including underground pipes connected thereto) which is used to contain an accumulation of regulated substances, and the volume of which (including the volume of the underground pipes connected thereto) is 10 per centum or more beneath the surface of the ground

#### Citation:
  - *42 U.S.C. § 6991*
  - Heading: **CHAPTER 81-ENERGY CONSERVATION AND RESOURCE RENEWAL > SUBCHAPTER IX-REGULATION OF UNDERGROUND STORAGE TANKS**

