7.1 Pesticide Storage Facility Standards, Containment & Security

7.1 Pesticide Storage Facility Standards, Containment & Security

Quick Answer: Dedicated pesticide storage facilities must be sited at least 100 feet from private wells, surface water, wetlands, residences, livestock facilities, and food or feed storage, positioned entirely outside 100-year floodplains on elevated ground. Structures must utilize non-combustible materials, liquid-tight sealed concrete flooring with perimeter curbing (retaining 110% of the largest liquid container or 10% of total aggregate liquid volume, whichever is greater), and dedicated mechanical exhaust providing at least 6 air changes per hour with floor-level intake ports. Dry formulations must be stored above liquids on pallets, volatile herbicides segregated, and facilities secured with perimeter locks, NFPA 704 hazard diamonds, off-site duplicate inventories, and annual EPCRA Tier II reporting.

Environmental Siting Standards & Buffer Setbacks

The primary objective of pesticide storage facility siting is safeguarding drinking water aquifers, surface waters, agricultural commodities, and human habitations from chemical leaks, structural fires, and catastrophic runoff. When planning or evaluating a pesticide storage facility, strict separation distances and topographic considerations must be enforced:

• Environmental setback (stewardship standard): North Dakota rule does not fix a numeric storage setback; it requires instead that pesticides be stored in a manner that will not endanger humans, animals, or the environment, nor contaminate food, feed, seed, or consumer goods (NDAC 60-03-01-06(2)(b)), and that bulk storage containers and loading areas be constructed and located so pesticides will not contaminate the environment, such as streams and water supplies (NDAC 60-03-01-11(4)). The widely used design standard that satisfies those duties is a buffer of at least 100 feet from private drinking water wells, springs, streams, rivers, irrigation canals, and prairie pothole wetlands, and the same distance from residences, livestock barns, open feedlots, and any human food or livestock feed storage.
• 100-Year Floodplain Exclusion: Facilities must be located completely outside designated 100-year floodplains (Special Flood Hazard Areas identified on FEMA flood insurance rate maps). Floodwaters inundating a chemical warehouse exert buoyant hydrodynamic forces that float drums and bulk totes, rupture containers, dissolve dry paper packaging, and disperse hundreds of gallons of concentrated pesticides across entire downstream watersheds.
• Topography & Surface Drainage: Facilities must be constructed on elevated knolls or engineered pads where surrounding terrain slopes away from the foundation. Surface stormwater runoff must be diverted around the perimeter via swales to prevent exterior floodwater from entering the building or washing spilled chemical residues into adjacent road ditches.

Physical Architecture & Secondary Containment Engineering

A pesticide storage facility must be engineered to resist fire, isolate accidental leaks, and provide complete fluid containment during an internal spill or sprinkler discharge.

Non-Combustible Building Materials

Structures should be constructed of fire-resistant, non-combustible materials such as concrete masonry unit (CMU) blocks, reinforced poured concrete walls, structural steel framing, and heavy-gauge corrugated metal siding and roofing. Combustible wooden studs, plywood wall cladding, and exposed flammable foam insulation must be avoided. In the event of an internal electrical fire or spontaneous chemical combustion, non-combustible architecture delays structural collapse and prevents the building from acting as fuel for toxic chemical smoke plumes.

Impermeable Sealed Concrete Flooring

The foundation must consist of a reinforced poured concrete slab designed with zero interior floor drains (or drains that have been permanently sealed with expanding hydraulic cement or capped with welded steel plates). Raw concrete is porous and readily absorbs petroleum solvent carriers, active chemical ingredients, and mineral salts. Therefore, the slab must be coated with a continuous, chemical-resistant, impermeable sealant—such as a multi-coat epoxy or polyurethane industrial coating—to prevent liquid absorption and allow complete surface decontamination.

Secondary Containment Capacity Calculations

Primary containers—including 2.5-gallon jugs, 15- to 55-gallon drums, and 250- to 330-gallon Intermediate Bulk Container (IBC) mini-bulks—must be enclosed within a fluid-tight secondary containment area. This is typically accomplished with a poured concrete perimeter curb or roll-over ramp berm surrounding the storage room.

North Dakota's binding rule applies to permanent containment areas for bulk pesticides (NDAC 60-03-01-11.2):

Two related prohibitions in NDAC 60-03-01-13 are heavily tested: bulk pesticide storage containers may not be placed underground, and a mixture or custom blend may not be held in inventory — it must be promptly delivered to the person who requested it. Repackaging must occur in a permanent containment area with a primary shutoff within immediate reach, and a spill kit must be located within fifty feet of an operational area (NDAC 60-03-01-12).

For non-bulk packaged product, North Dakota rule sets no numeric curb volume, so facilities design to the widely used industry standard. The containment volume should hold:

• At least 110% of the volume of the single largest liquid container stored within the bay, OR
• At least 10% of the total aggregate liquid volume of all containers stored within the containment zone, whichever volume is greater.

Worked Calculation: A commercial agronomy facility stores eight 250-gallon IBC totes of liquid herbicide in one bay, representing a total aggregate volume of 2,000 gallons ($8 \times 250 = 2,000\text{ gal}$).

1. Calculate 110% of the largest vessel: $250\text{ gal} \times 1.10 = 275\text{ gallons}$.
2. Calculate 10% of the aggregate volume: $2,000\text{ gal} \times 0.10 = 200\text{ gallons}$.
3. Determine the required containment capacity: The greater volume governs; the curbed basin must hold a minimum of 275 gallons of liquid.

Facility Security, Access Control & Hazard Communication

Pesticide storage facilities house hazardous, high-value, and toxic materials that present extreme risks to untrained individuals, children, domestic livestock, and emergency responders.

• Physical Security: Facilities must remain locked when unoccupied. Exterior doors must feature commercial deadbolts, heavy steel plates, and tamper-resistant hinges. Windows should be minimized, placed high on exterior walls, and reinforced with steel security bars or wire mesh to deter break-ins and theft.
• Perimeter Fencing: Standalone chemical storage compounds must be enclosed by a six-foot chain-link security fence topped with three strands of outward-angled barbed wire, secured with padlocked vehicle and personnel gates.
• Exterior Warning Signage: Weather-resistant bilingual warning signs must be posted on all exterior doors, windows, and perimeter gates: "DANGER: PESTICIDES — KEEP OUT / PELIGRO: PESTICIDAS", accompanied by emergency telephone numbers for the facility manager, local fire department, and spill response agencies.
• NFPA 704 Standard Diamond Placards: The National Fire Protection Association (NFPA) 704 standard hazard identification diamond must be posted prominently at all exterior entrances to alert arriving firefighters to chemical risks:
  • Blue Diamond (Left): Health Hazard (rated 0 to 4, where 4 indicates lethal toxic risk).
  • Red Diamond (Top): Flammability (rated 0 to 4, indicating flash points and combustion).
  • Yellow Diamond (Right): Instability / Chemical Reactivity (rated 0 to 4, indicating explosive detonation or violent decomposition hazards).
  • White Diamond (Bottom): Special Hazards (e.g., W with a slash indicating water-reactive chemicals that release toxic or flammable gases upon contact with water; OX indicating strong oxidizers).

Environmental Climate Regulation & Mechanical Exhaust Ventilation

Pesticide active ingredients and formulation adjuvants are chemically sensitive compounds that degrade or cause catastrophic physical failures when exposed to extreme thermal swings.

Low-Temperature Hazards (Freezing Protection)

In North Dakota, sub-zero winter temperatures represent a severe threat to liquid pesticide formulations, particularly emulsifiable concentrates (EC), liquid solutions (SL), and flowable suspensions (F/L). Chemical storage facilities must be insulated and heated with thermostatically controlled, explosion-proof electric or hydronic heating systems that maintain temperatures above 40°F (4°C).

• Crystallization & Salting Out: Freezing forces active ingredients out of solution, causing solid chemical crystals to precipitate at the bottom of the container. While some formulations can be redissolved by warming to 70°F and rolling the drum, many undergo irreversible crystallization, permanently destroying product efficacy and clogging sprayer strainers.
• Emulsion Breakdown: Freezing breaks emulsifier bonds in EC formulations, resulting in permanent phase separation of oil and water layers that cannot be re-homogenized.
• Physical Container Rupture: Water-based formulations expand by approximately 9% upon freezing, generating hydrostatic pressures that crack plastic jugs, dislodge drum bungs, and tear steel drum seams, releasing concentrated chemical pools during spring thaw.

High-Temperature Hazards (Excessive Heat > 100°F)

Ambient storage temperatures must never exceed 100°F (38°C). Prolonged exposure to intense summer heat creates multiple hazardous physical and chemical changes:

• Volatilization & Vapor Expansion: High heat increases internal vapor pressure, causing sealed plastic jugs to swell and distort, and steel drums to bulge or violently release toxic fumes when opened.
• Thermal Chemical Degradation: Heat accelerates chemical hydrolysis and active ingredient decomposition, significantly reducing insecticidal or herbicidal potency before application.
• Flammability Risks: Petroleum distillates and organic solvent carriers have defined flash points; high ambient heat elevates solvent vapors toward their lower explosive limits, drastically increasing fire hazards.

Dedicated Mechanical Ventilation Specifications

Pesticide storage structures must be equipped with dedicated mechanical exhaust ventilation or continuous cross-ventilation engineered to provide at least 6 air changes per hour (ACH).

• Floor-Level Exhaust Intake Ports: Because pesticide solvent vapors, active ingredient fumes, and carrier mists are substantially heavier than atmospheric air, exhaust intake louvers must be positioned within 12 inches of the floor to capture settling vapors.
• Top-to-Bottom Scavenging Airflow: Fresh air intake vents must be positioned high on opposing exterior walls near the ceiling, establishing a top-to-bottom scavenging cross-current that prevents toxic, flammable vapor pockets from accumulating near the floor.
• Electrical Safety: Ventilation fan motors, switches, and interior lighting fixtures must be sealed, dust-ignition proof, and rated as Class I, Division 1 or 2 explosion-proof electrical assemblies.

Storage Organization, Stacking Hierarchy & Chemical Segregation

A disorganized chemical warehouse increases the probability of physical container damage, worker exposure, and cross-contamination.

The Vertical Formulation Stacking Hierarchy

• Dry Formulations Above Liquids: Dry formulations—such as Wettable Powders (WP), Water-Dispersible Granules (WDG), Soluble Powders (SP), and Granules (G)—are packaged in multi-wall paper bags or cardboard cartons. They must ALWAYS be stored on pallets or upper shelves ABOVE liquid formulations.
• Operational Rationale: If a liquid jug or drum on an upper shelf leaks, the fluid drips downward onto lower containers. If dry formulations were stored below liquids, chemical leakage would soak into cardboard cartons and paper bags, dissolving the packaging, contaminating dry products, and creating unstable, hazardous chemical reactions. Storing dry products on upper shelves ensures that any liquid leak falls harmlessly onto the sealed floor or lower secondary containment basins.
• Heavy Container Placement: 55-gallon steel or polyethylene drums and bulk mini-bulks must rest directly on the curbed floor or on heavy-duty, ground-level structural pallet racking. Never stack 55-gallon drums more than two high, and only do so using factory drum-stacking pallets with interlocking rims.

Chemical Hazard Segregation

Different classes of agricultural chemicals must be physically segregated into designated bays:

• Volatile Herbicide Isolation: Volatile synthetic auxin herbicides—such as 2,4-D ester, dicamba, and MCPA—must be physically separated from all insecticides, fungicides, seed treatments, and crop seeds. Vapors from volatile herbicides can penetrate paper bags and plastic packaging of nearby insecticides or fungicides. If that contaminated insecticide is later sprayed over sensitive broadleaf crops (such as soybeans, dry edible beans, or sunflowers), trace herbicide residues will cause catastrophic crop stunting, leaf epinasty, and yield loss.
• Personal Protective Equipment (PPE) Isolation: PPE, first-aid kits, respirators, and clean work clothing must never be stored inside the pesticide storage room. They must be kept in a separate, clean, climate-controlled entryway or office to prevent chemical vapors from absorbing into respirator cartridges, rubber facepieces, and glove linings.

Inventory Management, FIFO Rotation & EPCRA Tier II Reporting

Careful recordkeeping and inventory rotation minimize chemical aging, container degradation, and emergency response confusion.

• First In, First Out (FIFO) Inventory Control: Mark the delivery date on every container with waterproof ink upon arrival. Position older stock in front so it is utilized first. Agricultural pesticides generally have an optimal shelf life of two to three years; beyond this window, emulsifiers break down, dry powders cake into solid blocks, and active ingredients degrade.
• Original Container Labeling: All pesticides must remain in their original containers with intact, fully legible EPA-approved labels firmly attached. Never transfer pesticides into soft drink bottles, milk jugs, fruit jars, or food containers. Storing pesticides in secondary beverage or food containers is a severe violation of federal FIFRA law and the primary cause of fatal accidental ingestions among children and farmworkers.
• Duplicate Off-Site Inventory Records: An accurate, updated duplicate copy of the facility's chemical inventory—listing commercial brand names, active ingredients, EPA registration numbers, container volumes, and Safety Data Sheets (SDS)—must be maintained in a separate, secure off-site location (such as the main business office or farm residence). In the event of a catastrophic facility fire, this off-site record is immediately handed to arriving emergency responders so they can determine fire suppression tactics and chemical hazards without entering the smoke plume.
• EPCRA Tier II Hazardous Chemical Reporting: Under the federal Emergency Planning and Community Right-to-Know Act (EPCRA / SARA Title III), facilities storing hazardous chemicals or designated Extremely Hazardous Substances (EHS) in quantities exceeding established Threshold Planning Quantities (TPQs) or 10,000 pounds must submit an annual Tier II Emergency and Hazardous Chemical Inventory report by March 1 of each calendar year. Filings must be submitted simultaneously to: (1) the North Dakota State Emergency Response Commission (SERC), (2) the Local Emergency Planning Committee (LEPC), and (3) the local fire department having primary response jurisdiction.

Independent Preparation Notice

This study guide is an independent educational publication developed by OpenExamPrep. It is not affiliated with, sponsored by, endorsed by, or produced in partnership with the North Dakota Department of Agriculture, North Dakota State University Extension, or the EPA.