6.5 Storage Facility Design, Spill Response & Waste Disposal

Storage Facility Design, Spill Response & Waste Disposal

Quick Answer: Proper handling of pesticides before and after application is just as vital as the application itself. A well-designed storage facility prevents catastrophic environmental contamination. If an accident does occur, rapid execution of spill response protocols (Control, Contain, Clean up) is required. Finally, applicators must follow strict regulations for disposing of empty containers and hazardous waste.

Pesticide Storage Building Design

A dedicated pesticide storage facility is the first line of defense against environmental contamination and human exposure.

Location and Siting

The physical location of the storage building is paramount.

• Downslope Siting: The facility should be located downslope and downwind from sensitive areas such as residences, livestock housing, and surface water bodies.
• Away from Wells: It must be situated well away from water wells (exceeding the 100-foot minimum buffer) and constructed outside of any known floodplains. If a flood inundates a storage shed, the resulting widespread contamination is often devastating.

Concrete Secondary Containment

The floor of a storage facility should be made of sealed, non-porous concrete. Wood floors are unacceptable because they easily absorb spilled chemicals.

• Secondary Containment (Berming): A proper facility includes a continuous, raised concrete curb or berm around the perimeter of the floor. This secondary containment acts as a giant basin, designed to hold the volume of the largest container stored in the building (plus additional capacity for fire suppression water) in the event of a catastrophic leak.

Ventilation and Temperature Control

Proper environmental controls maintain the integrity of the chemicals and protect worker health.

• Ventilation: Continuous mechanical ventilation (exhaust fans) is required to remove toxic vapors and prevent the buildup of flammable fumes.
• Temperature Control: Storage areas should be insulated and climate-controlled, generally maintaining a temperature between 40°F and 100°F. Freezing can cause liquid containers to rupture and ruin certain formulations, while extreme heat can cause chemicals to volatilize, expand, or become unstable.

Fire Safety

Pesticides, particularly those formulated with petroleum-based solvents, are highly flammable. The storage building should be clearly marked with NFPA (National Fire Protection Association) placards on the exterior to warn first responders of the specific chemical hazards inside. Applicators should provide local fire departments with an updated inventory of stored chemicals annually.

Emergency Spill Response: The Three Cs

Despite the best precautions, spills happen. When a pesticide spill occurs, applicators must react immediately following a universally recognized protocol: The Three Cs.

1. Control the Spill

The immediate first step is to stop the source of the leak, assuming it can be done safely with appropriate Personal Protective Equipment (PPE). This might involve uprighting a knocked-over jug, closing a valve on a leaking hose, or placing a smaller leaking container inside a larger, intact drum.

2. Contain the Flow

Once the source is controlled, you must prevent the spilled material from spreading further, especially keeping it out of drains, ditches, and waterways.

• Absorbing Materials: For liquid spills, use absorbent materials to soak up the chemical and create small dams. Excellent absorbent materials include kitty litter, vermiculite, sawdust, or specialized absorbent clay sweeps. Never use water to wash away a spill, as this only spreads the contamination.
• Earthen Dams: For larger outdoor spills, use a shovel to quickly build a dirt berm around the perimeter of the spill.

3. Clean up the Site

After containment, the area must be properly decontaminated.

• Sweep up the saturated absorbent materials (kitty litter/sawdust) and place them into heavy-duty plastic bags or a sealed drum.
• Decontaminate the concrete surface using a mixture of water and heavy-duty detergent or bleach (never mix bleach and ammonia-based fertilizers).
• The collected waste must be treated as hazardous waste.

CHEMTREC

For large-scale spills, transportation accidents, or situations threatening public safety, applicators should immediately contact CHEMTREC (Chemical Transportation Emergency Center). They provide a 24/7 emergency response hotline that connects first responders and applicators with chemical experts who can guide the cleanup of specific hazardous materials.

Waste Disposal and Container Management

Disposing of leftover pesticides and empty containers is strictly regulated to prevent soil and water contamination.

Hazardous Waste Rules (RCRA)

The Resource Conservation and Recovery Act (RCRA) governs the disposal of hazardous waste. Pesticides that are cancelled, severely degraded, or collected from a spill cleanup must be disposed of at an EPA-approved hazardous waste facility. They cannot be thrown in municipal trash or dumped on the ground.

Proper Rinsate Recycling

When a pesticide container is emptied, it is not truly "empty" until it has been properly cleaned.

• Triple Rinsing or Pressure Rinsing: Applicators must triple-rinse or pressure-rinse empty jugs immediately after emptying them into the spray tank.
• Handling Rinsate: The most important rule is that the water used to rinse the container (the rinsate) must be poured directly into the spray tank and applied to the target site according to the label. Rinsate should never be dumped on the ground or down a drain.
• Once properly rinsed and punctured (to prevent reuse), the plastic containers can be taken to a dedicated agricultural pesticide container recycling program or disposed of in a sanitary landfill, as permitted by state law.

Scenario Analysis: While loading a sprayer, a 2.5-gallon jug of concentrated herbicide falls off the tailgate and splits open on the concrete mixing pad. The applicator, wearing a respirator, gloves, and boots, immediately tips the jug upright to stop the leak (Control). They then surround the puddle with a thick layer of kitty litter to stop it from reaching the edge of the pad (Contain). Finally, they sweep the saturated kitty litter into a heavy-duty drum, scrub the concrete with detergent, and properly dispose of the drum contents as hazardous waste (Clean up).

Emergency Response Planning and Fires

Core Manual Chapter 9 pairs spill response with fire preparedness. Store pesticides away from ignition sources, keep extinguishers rated for the hazards present, and train everyone with storage access never to use water streams that could spread water-soluble pesticides or create toxic runoff. In a pesticide fire, prioritize human evacuation and notify firefighters that pesticides are involved so they can manage runoff and toxic smoke. Keep an inventory list off-site or near the exit so responders know what is burning. After any fire or major spill, do not resume use of partially burned or water-damaged containers until the state lead agency or product registrant provides disposal guidance.