Mich. Admin. Code R. 285.640.8 - Secondary containment of bulk liquid pesticides

Rule 8.

(1) Primary storage containers of bulk pesticide shall be located within a diked containment area that is constructed with a base, perimeter wall, sloped floor, and watertight catch basin or sump. A containment area shall not have a relief outlet or discharge valve unless the requirements of subrule (8)(d) of this rule are met.

(2) Minibulk pesticide containers that are in compliance with DOT-57 or MACA-75 specifications are exempt from secondary containment requirements. These minibulk containers shall be placed upon a paved impermeable surface.

(3) A container which is used solely for the premixing of use solutions, which has a maximum volume of 2,500 gallons, and which is in compliance with all of the following requirements shall be exempt from secondary containment requirements:

(a) The container shall be attended by facility personnel at all times when being used for mixing.

(b) The contents of the container shall be completely removed at least once every 24 hours.

(c) The container shall be placed upon a paved impermeable surface.

(d) The container shall be in compliance with the requirements specified in R 285.640.4.

(4) Capacity requirements for secondary containment areas are as follows:

(a) The diked area for containment at a bulk storage facility that is not protected from rainfall shall contain a minimum of 110% of the volume of the largest storage container within the diked area, plus the volume that is occupied by all other tanks within and below the height of the dike, plus the volume of a 6-inch rainfall.

(b) The diked area for containment at a bulk storage facility that is protected from rainfall shall contain a minimum of 110% of the volume of the largest storage container within the diked area, plus the volume that is occupied by all other tanks within and below the height of the dike.

(c) Secondary containment areas which were constructed before the effective date of this rule and which have a minimum capacity of 110% of the volume of the largest storage container within the diked area, plus the volume that is occupied by all other tanks within and below the height of the dike, shall be deemed to be in compliance with this rule. Any such storage facility shall, upon alteration of the secondary containment area or increases in storage container volume, be brought into full compliance within 1 year of the alteration or increase.

(d) Secondary containment that is not located within a roofed building shall provide for separation between bulk pesticides and bulk fertilizers to the extent that a common wall or curb between the pesticide and fertilizer areas will accomplish either of the following:

(i) Prevent pesticide from entering the fertilizer area, but allow fertilizer to enter and utilize the pesticide area while maintaining the capacity requirements specified in subdivisions (a) to (c) of this subrule.

(ii) Maintain a complete separation of fertilizer and pesticide, with or without a common wall, if each separate area maintains the capacity requirements specified in subdivisions (a) to (c) of this subrule.

(5) Wall requirements for secondary containment areas are as follows:

(a) The walls of a secondary containment area shall be constructed of any of the following materials and shall be designed to withstand a full hydrostatic head of any discharged liquid and weight load of material:

(i) Steel.

(ii) Poured reinforced concrete.

(iii) Precast concrete modules.

(iv) Solid masonry.

(v) Other materials approved by the department.

(b) Cracks and seams shall be sealed to prevent leakage.

(c) Walls shall not be more than 6 feet in height above interior grade unless provision is made for normal access and necessary emergency access to tanks, valves, and other equipment and for the safe exiting from the secondary containment facility.

(d) Walls that are constructed of concrete or solid masonry shall rest upon a floating base of concrete that is prepared as specified in subrule (7) (a) of this rule or upon suitable concrete footings that extend below the average frost depth to provide structural integrity. Joints between walls and base shall be made watertight.

(e) Piping shall not be installed through the secondary containment wall, except for interconnections between multiple secondary containment structures.

(6) Base requirements for secondary containment areas are as follows:

(a) The base of a secondary containment area shall slope to a watertight catch basin or sump where accumulated liquids can be removed.

(b) The base and any earthen walls of the secondary containment area shall be lined with concrete, steel, or approved synthetic liners.

(7) Liner requirements for secondary containment areas are as follows:

(a) Concrete liners shall be designed according to good engineering practices to withstand any foreseeable 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) Steel plates may be used for wall and base liners. Installation plans shall be approved by the department. The plates shall be protected against corrosion and joined in a manner to provide watertight joints.

(c) Synthetic liners and installation plans shall be approved by the department. A synthetic liner will not be approved by the department until the manufacturer of the liner provides the department with a written confirmation of compatibility and a written estimate of the life expectancy of the liner.

(d) Synthetic liners shall have a minimum thickness of 30 mils (0.8 millimeters) and be compatible with the materials being stored within the facility.

(e) Synthetic liners shall be installed under the supervision of a qualified representative of the manufacturer and all field-constructed seams shall be tested and repaired, if necessary, in accordance with the manufacturer's recommendations.

(f) Prefabricated diked areas shall not have a relief outlet or discharge valve. The base shall slope to a collecting spot where storm water can be discharged by a manually activated pump for use in the blending process or for proper disposal in accordance with the provisions of R 285.640.11.

(g) The department may approve the use of experimental materials upon written confirmation from the manufacturer regarding the pertinent specifications of the material for use in pesticide containment.

(8) Catch basin or sump requirements for secondary containment areas are as follows:

(a) The sump construction shall conform to the thickness specifications, on all sides including the base of the sump, for the remainder of the containment area base and shall be watertight.

(b) Discharge valves or drains shall not be plumbed into the sump unless the requirements of subdivision (d) of this subrule are met.

(c) Design and construction specifications for the sump shall address sediment accumulation, sediment removal, and freeze-thaw cycles.

(d) An exception for allowing discharge valves or drains to be plumbed into the sump may be granted if a catchment system that includes a catch drain, discharge valve, and concrete sump tank, as described in this subdivision, is operational and if all of the following conditions are met:

(i) The containment area and discharge valve or drain shall be in existence before the effective date of this rule. Construction of containment areas with discharge valves or drains will not be permitted after the effective date of this rule.

(ii) Concrete-lined areas shall have a recessed catch drain that runs through the center of the base. The catch drain shall be a minimum of 6 inches deep and 12 inches wide with an open grate cover.

(iii) The concrete slab that is located beneath the catch drain shall be at least the same thickness below and to the sides of the drain as the base is throughout the containment area and shall be in compliance with the provisions of R 285.640.8(6)(a).

(iv) The concrete base shall slope to the drain, and the drain shall slope to a discharge valve at the edge of the dike.

(v) The discharge valve shall be closed and secured at all times, except when in use as specified in paragraph (vi) of this subdivision, at which times it shall be attended by responsible personnel.

(vi) The discharge valve shall drain to an underground concrete sump tank that has a maximum capacity of 1,200 gallons. A self-priming recovery pump shall be used to move all materials from the tank to alternate contained storage. The sump tank shall be used as a temporary catchment only. The sump tank shall be pumped at least weekly during non-winter months to remove any water or pesticide material that it collects.

(vii) Liquids that accumulate in this type of catchment system shall be managed in accordance with the provisions of R 285.640.11(2)(a) only.

(9) Facilities that are placed in service after the effective date of this rule shall immediately comply with this rule. Facilities that are in service before the effective date of this rule shall have 2 years to comply with this rule.

Notes

Mich. Admin. Code R. 285.640.8

1992 AACS