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3. Environmental Checklist San Leandro Treatment Wetland IS/MND 3-41 February 2024 Accidental Spills and Handling of Hazardous Materials Project construction activities may necessitate the utilization of limited quantities of hazardous materials like fuels, oils, lubricants, and solvents. Improper handling, storage, transport, or disposal of these hazardous materials during construction could lead to accidental releases, posing risks to construction workers, the public, and the environment, including soil and surface water. Existing laws and regulations govern the transport, use, storage, handling, and disposal of hazardous materials to mitigate potential hazards. California Occupational Safety and Health Administration (Cal/OSHA) sets workplace safety standards for handling and using hazardous materials. Transportation of hazardous materials falls under the jurisdiction of the federal and state DOT or Caltrans, which establish driver training requirements, load labeling procedures, and container specifications to minimize the risk of accidental release. Moreover, the construction-phase SWPPP will include BMPs to control the use, storage, and transport of hazardous materials during construction. Therefore, the transport, use, storage, handling, and disposal of hazardous materials for the Proposed Project would be adequately regulated through existing requirements, thereby minimizing potential impacts during construction. Operation and maintenance of the Proposed Project may also involve the transport, use, storage, and disposal of small quantities of hazardous materials, like cleaners, fuels, lubricants, and hydraulic fluids, consistent with existing operations. Federal and state laws cover the handling of hazardous materials, minimizing worker safety risks from physical and chemical hazards in the workplace. Workers would receive HAZWOPER training as required for activities involving hazardous materials. Compliance with existing safety regulations and widely accepted industry standards would also serve to lessen public and environmental hazards. Construction and operation of the Proposed Project would be mandated to adhere to the California fire code and local building codes. It is possible that substances that could be considered hazardous, including gasoline, lubricants, and solvents may be temporarily used and stored at the proposed nitrification facility used to support the treatment wetland. The City shall require the contractor to comply with the safety and environmental submittal requirements for contractors’ submittals, consistent with current California regulatory requirements. The construction contract documents shall require that these materials be identified in an inventory, that current Material Safety Data Sheets be available on site, and that the hazardous materials be stored, labeled, and disposed of in accordance with applicable regulations. The contractor shall be held responsible for reporting any release of hazardous materials or other similar substances (in amounts above their reportable quantities). During the operations phase, the City will store and dispose of petroleum-based products and all flammable liquids in accordance with applicable laws and regulations. Impact Designation: Less than Significant Impact with Mitigation Incorporated Mitigation Measure HZ-1 – Active Fuel Pipelines Hazards: Prior to commencing construction activities, the exact positions of the three fuel lines must be accurately marked and confirmed in consultation