MIL-HDBK-1022A
(450 mm) in height. In appropriate environmental climates,
consider snow and ice accumulation as well. Limit dike
heights to 6 feet (1.8 m) or less.
8.11.3
Earthen Dikes. Construct dikes of earthen materials
with reinforced concrete cover, if acceptable with state and
local environmental regulations. Where space is a premium,
earthen dikes are not the best choice. Make the minimum
distance from the toe of the dike to the tank foundation 5
feet (1.5 m). Provide a flat surface on the top of the dike
at least 3 feet (0.9 m) wide. Do not make slopes steeper than
1 vertical to 1-1/2 horizontal. Cover the sides and top of
the dike and the basin floor around the tank with one of the
following materials (see Facility Plate No. 020):
a) A minimum of 3 inches (75 mm) of concrete paving
reinforced with woven wire fabric. Provide expansion and
contraction joints as necessary. Ensure joint material is
impervious to the fuel. If required by local or state
regulations, provide a fuel-resistant sealer on concrete dike
surfaces. As a minimum, spray concrete with a moisture
sealant. Consider potential weight when sizing concrete and
reinforcement.
b) A fuel impermeable liner. If liner is exposed,
the exposed areas must be resistant to the effects of direct
sunlight and to wind uplift. For covered liners, cover the
liner with gravel or other suitable material. Follow the
liner manufacturer's recommendations for protecting the liner
by the use of geotextile cover or other recommended means.
Assume the covered liner is resistant to wind uplift. In
either case, provide a hard surface for personnel access to
the tank and for work areas around tank manholes and valves.
139
Previous Page
