West Virginia Code of State Rules › Agency 61 - Agriculture › Title 61 - LEGISLATIVE RULE DEPARTMENT OF AGRICULTURE › Series 61-06B - Primary And Secondary Containment Of Fertilizers › Section 61-6B-11 - Secondary Containment of Fluid Bulk Fertilizer - Dikes and Elephant Rings

Current through Register Vol. XLI, No. 28, July 12, 2024
11.1. All primary
				storage of fluid bulk fertilizers shall be located within a diked area
				constructed with a base, perimeter wall and sloped floor drain or within an
				elephant ring as provided by this section.
11.2. No person may use the diked area for
				storage of products other than fluid bulk fertilizers and equipment used in the
				operational area. Adjoining secondary containment areas may share common
				walls.
11.3. All operators must
				maintain the minimum capacity requirement at all times. The minimum capacity
				requirement for the diked area for containment shall contain, below the height
				of the dike, one hundred twenty-five percent (125%) of the volume of the
				largest storage container within the diked area plus the submerged portions of
				all other storage containers, fixtures, and materials in the area. (The minimum
				capacity when the diked area is covered to prevent the accumulation of rainfall
				is a capacity equal to 100% of the volume of the largest container.)
11.4. Except where used as a method of
				monitoring the integrity of a secondary containment system, drainage tile
				within or underlying the area to be diked shall be eliminated.
11.5. All dikes providing secondary
				containment shall meet the following requirements:
11.5.1. the walls of a secondary containment
				facility shall be constructed of earth, steel, concrete or solid masonry, or
				other material specifically approved by the commissioner, and be designed to
				withstand a full hydrostatic head of any discharged fluid and weight load of
				material used in construction;
11.5.2. cracks and seams shall be sealed to
				prevent leakage;
11.5.3. walls
				constructed of earth or other permeable materials shall be lined as provided in
				this section;
11.5.4. earthen walls
				shall have a horizontal-to-vertical slope of at least three (3) to one (1),
				unless a steeper slope is consistent with good engineering practice, and shall
				be packed and protected from erosion;
11.5.5. the top of earthen walls shall be no
				less than two and one half (2.5) feet wide;
11.5.6. walls may exceed 6 (six) feet in
				height above interior grade only when provisions are made for normal access and
				necessary emergency access to tanks, valves and other equipment, and for safe
				exit from the secondary containment facility;
11.5.7. walls constructed of concrete or
				solid masonry shall rest upon a floating base of concrete prepared as in this
				section or upon suitable concrete footings which extend below the average frost
				depth to provide structural integrity;
11.5.8. the base of a secondary containment
				facility, and any earthen walls of the facility shall be lined with asphalt,
				concrete, an approved synthetic liner, or a clay soil liner designed to limit
				permeability of the base and walls. Liners shall meet the following
				requirements.
a. Asphalt or concrete liners
				shall be designed to withstand any loading conditions, including a full
				hydrostatic head of discharged fluid and static loads of storage containers,
				including appurtenances, equipment, and contents. Cracks and seams shall be
				sealed to prevent leakage.
b.
				Synthetic liners and installation plans shall be approved by the commissioner.
				All requests for approval shall include a written confirmation from the
				manufacturer of suitability including compatibility with the stored materials,
				and a written estimate of the life of the liner. Synthetic liners shall have a
				minimum thickness of thirty (30) mils (0.8 millimeters); and shall be installed
				under the supervision of a qualified representative of the manufacturer or a
				professional engineer. All field constructed seams shall be tested, and
				repaired if necessary, in accordance with the manufacturer's
				recommendations.
c. Soil liners
				shall be constructed by sealing the surface of the soil, including the berm of
				an earthen dike with a sealing agent such as sodium bentonite, attapulgite or a
				similar clay material. The soil liner shall be constructed in accordance with
				civil engineering practices, to achieve a coefficient of permeability not to
				exceed 1.0 x 10-6 cm/sec, with a thickness of not
				less than six (6) inches. The floor of the containment area within the soil
				liner shall be protected with a layer of gravel or crushed stone at least six
				(6) inches thick placed on top of the clay liner.