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      Department of Public Works Bureau of Sanitation

How to Prevent Stormwater Pollution at a
Hazardous Waste Treatment, Storage or Disposal Facility

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Outdoor Unloading and Loading

Only load and unload materials in designated areas. If possible, cover and contain the area or perform loading activities indoors. Pave the contained areas and consider installing a dead-end sump for easy cleanup of spilled materials.

Avoid loading or unloading materials in the rain. Close storm drains in the areas surrounding the delivery area during loading/unloading activities.

Regularly inspect the unloading/loading areas to detect problems before they occur. Inspect containers for leaks and proper labeling prior to loading/unloading any raw or spent materials.

Material Storage

Store all materials and waste indoors if possible and in compliance with other regulatory requirements (e.g. Fire Department). If materials are stored outside, a cover or tarp should be placed over the storage area and berms, dikes or other containment mechanisms used. Pave the contained areas to allow easy cleanup of spilled materials.

Using ditches, swales, berms, and/or grading, divert stormwater around material and waste storage, handling and processing areas where it can contact stored or spilled material.

Store hazardous waste in sealed drums on pallets in a contained area. Stack the drums so there is room to move through the storage area without causing damage to the drums.

Clearly label all containers and include necessary warnings and special handling instructions.

Facility Operations

Develop and implement spill control plans for loading, storage and handling areas. Use catch buckets, drop cloths, and other spill prevention measures where liquid materials are loaded/unloaded, stored or treated. Place drip pans under hoses. Use dry clean-up methods instead of washing areas down.

Maintain an inventory of all raw and spent materials.

Post notices prohibiting the dumping of materials into storm drains.

Keep all areas clean. Sweep and keep the floors clean and dry.

Regularly inspect storage areas and containers and raw material for leaks and corrosion. Inspect piping, valves and equipment for leaks and spills. Fix all problems found as soon as possible.

Numbers to Call for More Information

Department of Toxic Substances Control (hazardous waste questions) (818) 551-2800/2830 (Duty office) or (916) 324-1826

Regional Water Quality Control Board, Los Angeles Region (213) 266-7500
If you have questions about this fact sheet, please call: 1(800) 974-9794

Immediately clean up spills using dry methods.
Inspect containers when delivered and during storage for leaks and proper labels. Store off ground or on pallets
Use catch buckets, drop cloths, and other spill prevention measures where liquid materials are loaded/unloaded, stored or treated.
Store materials and waste inside or in covered, bermed areas.