Administrative Rules of Montana › Department 4 - AGRICULTURE › Chapter 4.10 - AGRICULTURAL SCIENCES DIVISION › Subchapter 4.10.11 - Pesticide Reporting, Cleanup, and Containment › Rule 4.10.1105 - SECONDARY CONTAINMENT AT PERMANENT STORAGE FACILITIES

Current through Register Vol. 13, July 5, 2024
(1) Any individual primary containment
				capable of storing more than 500 U.S. gallons or 4,500 pounds and in-service
				for more than 14 consecutive days and its associated appurtenances must be
				placed within secondary containment that meets the following requirements:
(a) secondary containment not protected from
				precipitation shall contain at least 125% of the volume of the largest primary
				containment within the secondary containment plus the displacement of all other
				primary containment, appurtenances, and other items which cause displacement
				within the secondary containment.
(b) secondary containment located indoors or
				under a roof to prevent accumulation of precipitation shall contain at least
				110% of the volume of the largest primary containment plus the displacement of
				all other primary containment, appurtenances, and other items which cause
				displacement within the secondary containment.
(c) the walls and floors of secondary
				containment shall be constructed of steel, poured reinforced concrete, precast
				concrete modules, solid masonry, synthetic liners, or other materials that will
				provide secondary containment. Floors and walls constructed of clay, natural
				soil, natural soil clay mixtures or clay bentonite mixtures are prohibited.
				Materials used in the secondary containment shall be chemically compatible with
				the pesticides being stored. A written conformation of compatibility from the
				manufacturer and kept on file at the PSF or at the nearest office from which
				the PSF is administered is recommended.
(d) walls shall withstand a full hydrostatic
				head of any spill, and shall be sealed to prevent leakage.
(e) piping through the outside walls of a
				secondary containment is prohibited.
(f) the secondary containment floor shall
				slope to a liquid tight collection point or sump that allows spilled or
				deposited material to be easily removed. Any pump used for recovering materials
				from the secondary containment shall be manually activated.
(g) synthetic liners shall be installed under
				the supervision of a qualified representative of the manufacturer, a contractor
				certified by the manufacturer, or a certified engineer. All seams shall be
				tested and repaired, if necessary, in accordance with the manufacturer's
				recommendation. A record regarding installation date, life expectancy and
				chemical compatibility must be kept.
(h) a prefabricated secondary containment
				shall be composed of a rigid prefabricated basin having a base and walls
				constructed of steel or synthetic materials which are resistant to corrosion,
				puncture and cracking.
(i) the
				prefabricated secondary containment shall withstand all foreseeable loading
				conditions, including the primary containment load and a full hydrostatic head
				of any spill. Multiple basins shall be connected in a manner which assures an
				adequate transfer of discharge between basins.
(j) discharge outlets, valves or gravity
				drains shall comply with ARM
				4.10.1103(5).
(k) secondary containment for pesticides must
				be separate from containment for fertilizer, but they may have a common wall or
				partition.