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TM 5-5430-210-12
2-9. Berm Construction, 3,000-Gallon (11,355-Li-
ter) Tank. The following instructions are for a 13-
foot by 13-foot (3.962-meter by 3.962-meter) (flat
dimensions) tank.
NOTE
A minim urn two-foot (O. 7-meter)
working clearance is necessary be-
tween the side of the tank and the
berm on all four sides.
a. Clear and level an area 29 feet by 29 feet (8.84
meters x 8.84 meters)
b. Inspect area closely. Remove all sharp objects
from the leveled area.
c. Slope all four sides of the leveled area in to-
ward the center (fig. 2- 13). The center should be no
more than three inches (7.62 centimeters) below
ground level, which will give an approximate slope
of one degree, If possible, provide a sand bottom ap-
proximately four inches (10.16 centimeters) thick.
d. Erect a three and one half-foot (1.07-meter)
high berm around the outside of the sloped area.
e. To provide a berm drain, place a 2-inch (5.08
centimeter) pipe with a gate valve through the bot-
tom of the discharge end of the berm in order to pro-
vide a means of draining accumulated water. The
valve should normally be closed; open valve only to
drain water from the bermed area.
Make certain that the valve is
closed tightly after installation.
I n t h e e v e n t o f t a n k r u p t u r e,
an open valve would permit fuel
to drain from the berm and can
cause fire or explosion.
2-10. Berm Construction, 10,000-Gallon (37,850-
Liter) Tank. The following instructions are for a
22-foot by 22-foot (6.706-meter by 6.706-meter)
(flat dimensions) tank.
NOTE
A minimum two-foot (0.7.-meter)
working clearance is necessary be-
tween the side of the tank and the
berm on all four sides.
a. Clear and level an area 35 feet by 35 feet
(10.668 meters by 10.668 meters).
b. Inspect area closely. Remove all sharp objects
from the leveled area.
c.
ward
Slope all four sides of the leveled area in to-
the center (fig. 2-14). The center should be
no more than five inches (12.7 centimeters) below
ground level, which will give an approximate slope
of one degree. If possible, provide a sand bottom
approximately four inches (10.16 centimeters)
thick.
d. Erect a three and one-half foot (1.07-meter)
high berm around the outside of the sloped area.
e. To provide a berm drain, place a 2-inch
(5.08-centimeter) pipe with a gate valve through
the bottom of the discharge end of the berm in
order to provide a means of draining accumulated
water. Valve should be normally closed; open valve
only to drain water from bermed area.
M a k e c e r t a i n t h a t t h e v a l v e is
c l o s e d a n d l o c k e d a f t e r
i n s t a l l a t i o n . I n e v e n t o f t a n k
rupture, an open valve would permit
fuel to drain from berm and can
cause fire or explosion.
2-10.1. Berm Construction, 20,000-Gallon
(75,700 Liter) Tank. The following instructions are
for a 24-foot 6-inch by 28-foot 6-inch (7.468-
meter by 8.687-meter) (flat dimensions) tank.
NOTE
A minimum three-foot (1-meter) work-
ing clearance is necessary between the
side of the tank and the berm on all four
sides.
a. Clear and level an area 29 feet by 33 feet
(8.84 meters by 10.06 meters).
b. Inspect area closely. Remove all sharp objects
from the leveled area.
C. Slope all four sides of the leveled area in
toward the center (fig. 2-14,1). The center should
be no more than five inches (12.7 centimeters)
below ground level. If possible, provide a sand
bottom approximately four inches (10.16 centi-
meters) thick.
d. Erect a four-foot (1.22-meter) high earth
berm around the outside of the sloped area,
e. To provide a berm drain, place a 2-inch
(5.08-centimeter) pipe with a gate valve through
the bottom of the discharge end of the berm in
order to provide a means of draining accumulated
water. Valve should be normally closed; open valve
only to drain water from bermed area.
2-12 Change 5
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