MIL-HDBK-1022A
pitched a minimum of one percent toward catch basins or trench
drains. Design containments to the most stringent of Federal,
State, or local regulations. Provide containment with
capacity equal to the larger of the volume of the largest tank
truck or tank car compartment to be loaded or the runoff from
a rainfall of intensity equal to a 5-year expectancy, 1-hour
duration storm. Provide a normally closed valve on the drain
system to allow for containment during fueling operations and
which can be opened to drain the area when necessary. If a
canopy, which is designed to preclude rain from the contained
area, is installed, reduce the sizing for rainfall, accounting
only for wind-blown rain. Consider combining the containment
with other containments or treatment facilities on-site.
However, take the level of contamination of each containment
area into consideration. Do not use asphalt within a
containment area.
i) If top loading is required for tank cars
(normally only when commercial contract leaves no other
choice) and approved by Service Headquarters, provide a
typical tank car loading rack with an elevated steel platform,
consisting of a walkway, 4 feet (1.2 m) wide, 10.5 feet (3.2
m) above the top of the rails, and the full length of six tank
cars. Ensure that the centerline of the structure is 10.5
feet (3.2 m) above the centerline of the tracks. Equip the
platform with a counterweighted or spring-loaded tilting
bridge to connect to the tank car dome at each loading
station. Design so that when released from the horizontal
position, the bridge will automatically move and lock in an
upright position away from any part of the tank car under all
weather conditions. Refer to NAVFAC Drawing No. 1403989.
Ensure conformance with MIL-HDBK-1002/1 and Army Corps of
Engineers AEI requirements. Platform is not required on Air
Force projects.
j) Pave with concrete or otherwise provide
containment for an area extending from 5 feet (1.5 m) outside
of each outer rail and extending longitudinally 15 feet (4.6
m) each way from the center of each loading position. Slope
the paved area to a catchment or treatment facility as
described previously in Item (h).
3.4.2.2
Tank Truck Fillstand Equipment Required
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