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shall be rejected if the highest historical level of the water table is too
close to the lowest point of the sanitary landfill.  This condition is usually
specified by state regulations/guidance or during permit review.  Because the
conditions affecting groundwater problems are so complex, it is essential that
investigation of the landfill site include an evaluation by a qualified
groundwater hydrologist. Soil.  Soil conditions must be suitable for preventing
groundwater pollution, for excavating and covering the fill, and for vehicle
access.  Most soil types can be used for cover material; however, well-graded
soils are preferable to other types because of better compactability and
workability in all weather conditions.  The most ideal soils are silt and clay
soils, which restrict leachate and gas movement.  Peat, granular, and highly
organic soils shall not be utilized for landfills because they contain a large
amount of voids and are difficult to compact.  Types of materials used for
cover material are dependent on the type of leachate control system used in
the landfill.  Final cover may consist of soils, natural or synthetic liners,
or chemically or physically amended earthen materials underlying at least 6
in. of topsoil or other soil that will sustain the growth of vegetation.  The
cover material shall have a permeability of 1 x 10-5 to 1 x 10-7 cm/s.  Federal
and state regulations shall be consulted to determine the exact requirements
for the specific state in which the landfill is located. Other considerations.  The relationship of the potential
landfill site to other installation activities must be considered.
Aircraft.  Sites shall not be located in the vicinity of military or
civilian airfields, where birds attracted to the landfill facility
could pose a hazard to aircraft.  Birds are dangerous to aircraft
because they can ruin jet engines and cause aircraft to crash.  The
proper distances from an airport runway can be obtained from
federal/state regulations or guidance.  A landfill shall not be
located with 10,000 ft of the closest point of any runway at any
airport subject to regulation by the Federal Aviation Administration
(FAA) which may be used by turbo-jet aircraft or within 5000 ft of
any runway of any such airport used only by piston engine type
aircraft unless it has been determined by the FAA that the proposed
landfill poses no safety hazard to aircraft in the vicinity.  State
regulations should also be consulted as they may be more restrictive
than FAA regulations.
Social consideration.  Potential socioeconomic effects of a site
should be determined.  Sites shall be selected away from human
activity where possible to avoid odor and noise nuisances, litter,
and public safety hazards associated with the landfill site and
Utilities.  The site shall have access to electricity, sanitary
services, and water.  Telephone or radio communications are also
desirable. Methodology Adherence to a carefully planned sequence of activities to
develop a landfill design minimizes project delays and expenditures.  A


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