Current through Register Vol. 47, No. 6, September 18, 2024
All liquid fertilizer and soil conditioner storage facilities,
except anhydrous ammonia storage facilities, as defined in rule
21-44.51 (200) shall
be located within a secondary containment structure. The secondary containment
structure shall have a volume 20 percent greater than the volume of the largest
storage tank within the area, plus the space occupied by the other tanks in the
area, and may be constructed of earth, concrete, or a Cornbination of
both.
(1) Secondary containment
structures constructed entirely or partially of earth shall Cornply with the
following minimum requirements:
a. The soil
surface, including dike, shall be constructed to prevent downward water
movement at rates greater than 1 x 10-6 cm/sec, and
shall be maintained to prevent downward water movement at rates greater than
1x10-5 cm/sec. The method of achieving a
satisfactory seal shall be determined by a registered engineer
b. Dike shall be protected against erosion.
If the slope is 30 degrees or less, grass can be sufficient protection,
provided it does not interfere with the required soil seal. If greater than 30
degrees, other methods of erosion protection shall be used.
c. Top width of dike shall be no less than
21/2 feet. The slope should be no greater than 45 degrees.
d. The diked area shall not have a relief
outlet and valve. The base shall slope to a collecting spot where storm water
can be pumped over the berm, provided the liquid is not contaminated with
fertilizer or soil conditioner materials. If contaminated with liquid
fertilizer or soil conditioner, the liquid shall be field applied at normal
fertilizer application rates or transferred to auxiliary storage
tanks.
e. Storage containers shall
be anchored or placed on a raised area to prevent flotation or instability in
the event of discharge into the secondary containment facility.
(2) Secondary containment
structures constructed of concrete shall be watertight and Cornply with the
following requirements:
a. The base of the
containment structure shall be designed to support all tanks and their
contents.
b. The diked area shall
not have a relief outlet and valve. The concrete base shall be sloped to a
collecting area for recovery of fertilizer material. Storm water may be
discharged over the containment wall, provided the liquid is not contaminated
with fertilizer or soil conditioner material. If contaminated, the liquid shall
be field applied at normal fertilizer application rates or transferred to
auxiliary storage tanks.
c. Storage
containers shall be anchored or placed on a raised area to prevent flotation or
instability in the event of discharge into the secondary containment
facility.
d. Routine inspection is
required to ensure against concrete cracks. Where cracks exist, storage
integrity shall be maintained with acceptable sealant.
