Closure.

TM 5-814-7

flexibility is permitted in choice of liners, which may, for

waste and waste residue and all system components

short-term storage of wastes, be constructed of clay,

(e.g., liners), subsoil, structures and equipment which

synthetic materials or admixes. If the waste pile will not

have been contaminated by contact with the waste.

be closed for 10 years or more (and cannot be

However, if contamination of the subsoil is so extensive

periodically cleaned and inspected for leakage), a

as to preclude complete removal or decontamination, the

double-lined system with leak detection and monitoring

closure and post-closure requirements applying to

wells is required. Details on liner requirements are

landfills must be observed.

Ensuring adequate

presented in paragraph 6-3.

containment of waste should therefore be an important

(2) A leachate collection and removal system is

consideration in initial design of a waste pile.

also required to collect any leachate that may be

f.

Equipment needs. The type of equipment

produced in a waste pile by infiltration of moisture,

employed in operation of a waste pile depends to a large

decomposition or reaction.

Leachate systems are

extent on the waste characteristics and the size of the

discussed in paragraph 6-4. Run-on and run-off control

pile. With the exception of compactors, many of the

facilities, which are required for waste piles, are

vehicles used in landfill operations can also be employed

addressed in paragraph 6-5.

for waste piles. Bulldozers and front end loaders are

(3) If the waste pile contains particulate matter,

widely used to place wastes; scrapers can also be used

wind dispersal controls are mandated by the regulations.

on some applications, particularly where the size of the

Mechanisms for preventing dispersal of particulate are

pile and the coarseness of the waste permit the scraper

discussed under special design elements in paragraph 6-

to deposit wastes over the top of the pile. Large-scale

9.

operations may also be able to use conveyor belts or

e. Closure. Since waste piles cannot be used

drag lines to deposit the wastes over the pile. Any

for permanent disposal of wastes, and can be permitted

equipment used to unload and place wastes must be

only for storage, closure requirements are less stringent

decontaminated before being taken out of the disposal

than for disposal facilities such as landfills. The principal

operation area.

closure requirement for a waste pile which has achieved

adequate waste containment during its active life is

removal or decontamination of all

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