Spadra Landfill - Walnut, California Solid Waste Management Facility

Spadra Landfill is an operational solid waste facility located at 4125 West Valley Boulevard in Walnut, California, within Los Angeles County. As a landfill, it serves as a key disposal site for municipal solid waste generated in the region, operating under the regulatory framework of the United States Environmental Protection Agency (EPA) and the California Department of Resources Recycling and Recovery (CalRecycle). The facility is classified under NAICS codes 562112 (Hazardous Waste Treatment and Disposal), 562212 (Solid Waste Landfill), and 562920 (Materials Recovery Facilities), indicating a diverse waste management portfolio. Landfills in Los Angeles County typically handle large volumes of waste, often exceeding 500,000 tons annually. The facility must comply with RCRA Subtitle D standards for municipal solid waste landfills, including liner and leachate collection systems, as well as Clean Air Act regulations for landfill gas control. Spadra Landfill plays a significant role in the solid waste infrastructure of Southern California, serving a densely populated urban area. Its environmental significance includes managing landfill gas through collection and flaring or energy recovery, and controlling leachate to protect groundwater. The facility's location in a semi-arid climate with proximity to residential communities necessitates careful operational management to minimize odors, traffic, and other community impacts.

In the Los Angeles Basin, landfills like Spadra face challenges related to landfill gas emissions, particularly methane, a potent greenhouse gas. The facility likely operates a gas collection and control system to comply with EPA's New Source Performance Standards. Leachate management is critical due to the region's seasonal rainfall and proximity to groundwater aquifers. Community proximity requires measures to mitigate traffic, dust, and odor impacts, aligning with local environmental justice considerations.