Sec. 8.
(a) A liner
need not be installed directly under a storage container having a capacity of
one hundred thousand (100,000) gallons or more that has been constructed
on-site and put into use before July 6, 1991, provided that one (1) of the
following alternative procedures are complied with, certified to in writing by
an official of the company who owns the container, and the certificate is filed
with the state chemist:
(1) Alternative 1
shall be as follows:
(A) A second bottom made
of steel shall be constructed for the storage container and placed over the
original bottom and a layer of smooth, fine gravel or coarse sand having a
minimum thickness of six (6) inches.
(B) The original bottom of the storage
container shall be tested for leaks before the sand layer or second bottom is
installed. A record of the test shall be kept on file at the storage
facility.
(C) The newly constructed
bottom shall be tested for leaks before any fluid fertilizer is stored on the
newly constructed bottom. A record of the test shall be kept on file at the
storage facility or at the nearest local office from which the storage facility
is administered.
(D) There shall be
a method by which leaks from the newly constructed bottom into the sand layer
may readily be detected.
(E) The
newly constructed bottom shall be tested at least once every five (5) years for
leaks. A record of the tests shall be kept at the storage facility.
(2) Alternative 2 shall be as
follows:
(A) The container shall be emptied,
cleaned, and tested for leaks. The walls and floor of the container shall be
tested to assure that welds and thickness of steel plates are sound and
adequate to contain the fertilizers. A record of the inspection, test results,
and any repairs made shall be submitted to the state chemist and maintained by
the owner or operator.
(B) The
interior floor and at least twelve (12) inches of the wall areas of the
container above the floor shall be coated with an approved liner to inhibit
corrosion. A record of this procedure shall be submitted to the state chemist
and maintained by the owner or operator.
(C) An approved test for leaks shall be
conducted every five (5) years thereafter. A record of the test findings and
indicated repairs and maintenance shall be maintained by the owner or
operator.
(3)
Alternative 3 shall be as follows:
(A)
Monitoring devices shall be installed in angled borings in the unsaturated
earth materials under each tank. These monitoring devices shall constitute a
leak detection system for each tank in advance of the point at which any leak
would reach ground water.
(B) The
number, length, and depth of each boring shall be determined on the basis of
site characteristics. The array of monitoring devices under each tank shall
constitute the best practical early warning detection system for tank
leakage.
(C) Each monitoring plan
under this alternative shall be implemented only upon review and approval of
the state chemist.
(b) The secondary containment requirements
under this rule do not apply to rail cars that are periodically moved to and
from the storage facility.
(c) The
state chemist may recognize other methods that provide equivalent protection.
