CFR /  Title 40  /  Part 265  /  Sec. 265.315 Special requirements for containers.

Unless they are very small, such as an ampule, containers must be either:

(a) At least 90 percent full when placed in the landfill; or

(b) Crushed, shredded, or similarly reduced in volume to the maximum practical extent before burial in the landfill. [50 FR 16048, Apr. 23, 1985]