Current through September 21, 2024
The design and construction of animal waste storage
facilities for confined swine feeding operations shall meet the following
minimum standards:
(a) Animal waste
storage structures shall be required to have secondary containment and liquid
recovery systems incorporated because they are subject to a constant hydraulic
head.
(b) A total minimum animal
waste storage capacity equal to nine (9) months waste production shall be
provided to allow for the limited periods when manure slurries may be land
applied.
(c) The design of the
operational unit shall permit any animal waste storage structure to be removed
completely from service for repair without significant impact to the feeding
operation.
(d) Concrete
construction shall conform to recommendations of the "Concrete Manure Storage
Handbook," MWPS-36 dated 1994, or later version as adopted by division policy,
published by the MidWest Plan Service and available from the land grant
universities of the North Central Region.
(e) Structures interior to or beneath swine
housing facilities constructed of concrete, shall meet the following
requirements: (Construction of other materials shall be addressed pursuant to
Section 31 of these regulations.)
(i)
Construction shall be of air entrained concrete with a 28-day compressive
strength of 4000 psi or better. All joints shall be keyed construction and
sealed with a high quality elastomeric caulk. All expansion joints shall have
bulb type water stops.
(ii) The
secondary containment shall consist of a geomembrane liner at least 30 mils
thick installed according to the manufacturer's recommendations, a geosynthetic
clay liner, or a compacted clay liner at least one (1) foot thick with a
permeability of 1 X 10-6 cm/sec or less. Compacted
clay liners shall be constructed, tested, and certified in accordance with the
provision of Section 35(d)(i)(A). The secondary containment shall be graded to
the recovery system with a minimum grade of 0.4 percent.
(A) The secondary containment surfaces shall
drain by gravity into the recovery system. The recovery pump shall have a
totalizing hour meter and a high level alarm.
(B) The amount of the liquids being recovered
from the secondary containment surface shall be determined and recorded on a
weekly basis. If the calculation of liquids recovered exceeds sixty (60)
gallons/week/thousand square feet of confinement building, repair of the
storage tank or pit must be completed within six (6) months. The permittee
shall report any rate greater than this to the Division within seven (7)
days.
(C) If the recovery rate
exceeds 120 gallons/week/thousand square feet of confinement building, the
storage facility must be emptied within sixty (60) days and repairs made. The
permittee shall report any rate greater than this to the Division within 48
hours.
(D) If the high alarm level
is reached, the Division must be notified immediately. The storage tank must be
emptied immediately.
(iii) Animal waste shall not be allowed to
accumulate to within one (1) foot of the bottom of the floor slats.
(iv) Interior or under floor animal waste
storage facilities shall be mechanically ventilated. If the exhaust gas from
this mechanical ventilation is determined to be a source of problem odors,
treatment of the exhaust gas shall be required. A positive odor control
technology resulting in either the adsorption or destruction of the odor
causing gases shall be installed.
(f) Above grade structures are subject to the
following requirements:
(i) Above grade
structures shall be surrounded with a containment dike designed to hold a
minimum of 1.5 times the tank volume.
(ii) Secondary containment shall be designed
and operated pursuant to Section 34(e)(ii) of these regulations.
(iii) A floating cover shall be maintained on
uncovered above ground structures. Other BAT may be employed or required
instead of a floating cover.
(g) Below grade external structures shall be
either concrete or lined earthen storage basins.
(i) Concrete structures and secondary
containment systems shall be designed according to this section.
(ii) Lined earthen storage basins shall be
designed according to Section 35(c) and (d) of these regulations.
(A) Only earthen basins with geomembrane
liners and secondary containment shall be allowed. The geomembrane liner shall
be a minimum of 60 mils thick and installed according to the manufacturer's
instructions.
(B) The engineering
design report must show the animal waste removal operations shall not damage
the integrity of the liner.
(iii) A floating cover shall be maintained on
uncovered below grade external structures. Other BAT may be employed or
required instead of a floating cover.
