What is the California statute that regulates the discharge of liquid hazardous wastes or hazardous waste containing free liquids?

The correct answer is associated with the regulation of hazardous waste in California, particularly the discharge of liquid hazardous wastes or hazardous waste containing free liquids. The statute that specifically governs this is the State Water Resources Control Board (SWRCB) regulations, which fall under California's broader framework for hazardous waste management.

The SWRCB is responsible for the development and implementation of laws and regulations that protect California's water resources, including the management and regulation of hazardous wastes to prevent contamination of water supplies. This includes overseeing the proper treatment, storage, and disposal of hazardous wastes that can potentially harm the environment and public health.

In contrast, while the Toxic Pollution Control Act (TPCA), Clean Air Act (CAA), and Resource Conservation and Recovery Act (RCRA) play significant roles in environmental protection and hazardous waste management, they are either federal statutes or do not specifically pertain to the state-level regulation of liquid hazardous waste discharge in California. Therefore, the focus on the SWRCB makes it the relevant authority for this context.