USS-POSCO Industries, Soil Remediation and Expansion of the Unit One Landfill (Corrective Action Management Unit)

USS-POSCO Industries, Soil Remediation and Expansion of the Unit One Landfill (Corrective Action Management Unit)

Soils impacted with metals (arsenic, lead), polychlorinated biphenyls (PCBs), and/or oil and grease above industrial cleanup levels determined through use of a site specific risk assessment for industrial property use, will be excavated from ten areas around the USS-POSCO facility. Those soils which are non-RCRA, do not contain PCBs, and which been demonstrated not to have the potential to impact groundwater will be added to an already existing landfill which contains non-RCRA California hazardous wastes. The existing landfill, referred to as the Unit One landfill, covers eight acres and rises to a height of approximately 39.5 feet above sea level. Addition of soils will raise the elevation of the landfill to 48 feet above sea level and increase the footprint to 10 acres. Approximately 94,200 cubic yards of additional soils would be added to the 130,800 cubic yards already in place at the Unit One landfill. The Unit One Landfill would then become a Corrective Action Management Unit (CAMU) as defined in Title 22 of the California Code of Regulations. Once expanded the landfill would be referred to as the Unit One CAMU. The Unit One CAMU will be closed once the soils are in place, will have a geosynthetic cap to revent intrusion of rainwater and will be inspected at least once a month for erosion and other possible incursions. The landfill does not have an uderliner. As system of groundwater monitoring wells will be sampled on a regular basis to ensure that groundwater monitoring is not being impacted by the landfill. A post-closure permit is required for this landfill to ensure continued groundwater monitoring and cover maintenance. The post-closure permit will be valid for ten years at which time renewal is required. Those soils containing PCBs, testing positive for RCRA criteria, and/or which not been shown to be protective of groundwater will be disposed of at an appropriate off-site facility. The volume of soil estimated for off-site disposal is 1,441 cubic yards.

Pittsburg

Contra Costa

Air Resources Board, Major Industrial Projects, California Department of Fish and Wildlife, Bay Delta Region 3 (CDFW), California Department of Health Care Services (DHCS), California Department of Parks and Recreation, California Department of Transportation, District 4 (DOT), California Native American Heritage Commission (NAHC), California Public Utilities Commission (CPUC), California Regional Water Quality Control Board, San Francisco Bay Region 2 (RWQCB), California State Lands Commission (SLC), Department of Water Resources, Resources Agency, Resources, Recycling and Recovery

Industrial (Sq. Ft. 435,000, Acres 10)

Aesthetics, Air Quality, Cultural Resources, Cumulative Effects, Drainage/Absorption, Economics/Jobs, Flood Plain/Flooding, Geology/Soils, Hazards & Hazardous Materials, Hydrology/Water Quality, Land Use/Planning, Mineral Resources, Noise, Schools/Universities, Transportation, Vegetation, Wildlife