the volume of import being accepted. Sampling requirements will be established by the RWQCB as part of Title 27 closure requirements. All materials that will be used to form a permanent landfill cap will be screened to ensure that they meet the regulatory standards of Title 27 and the RWQCB.
[See page 5-107 for the original comment] See Response BBCAG-104.
[See page 5-107 for the original comment] See Response BBCAG-104.
[See page 5-107 for the original comment] The description of the artificial fill on Draft EIR page 4.G-19 was based on observations made from borings that were part of previous geotechnical investigations and were not meant to characterize the waste within the landfill of to provide a comprehensive list of the landfill waste (see Draft EIR Section 4.H, Hazards and Hazardous Materials, for a more detailed characterization of waste within the landfill). However, to further characterize the materials received by the landfill, the following information from the Hazardous Materials Summary Report for the Brisbane Landfill (contained in Appendix H of the Draft EIR) is added to paragraph 4 on page 4.G-19 of the EIR:
- Artificial Fill
- Landfill. Non-engineered fill material incudes soils, concrete, bricks, tires, steel, and wood. The soil types range from sandy clay to gravel with sand and range in thickness from 6 to 40 feet. The majority of fill was composed of silty clay and concrete matrix. A clean soil layer approximately ten feet thick overlies the waste. The landfill was used for the disposal of solid wastes composed principally of domestic, industrial and shipyard waste, sewage, and rubble (Geosyntec, 2012c). Thickness ranges from 20 to 35 feet.
[See page 5-107 for the original comment] The text on page 4.G-19 provides a description of “Waste” as a geologic unit, and is not intended to characterize the wastes within the former landfill onsite. As noted above, refuse from residential; commercial; industrial activities including shipyard waste; and construction rubble, tires, and sewage were placed in the landfill prior to cessation of operations in 1967. A more complete description of the Brisbane Landfill is presented in the Draft EIR on pages 4.G-23 through 4.G-34.
[See page 5-107 for the original comment] Different terminology has been used throughout the history of assessments, investigations, and remedial activities by different consultants for the geologic formations and hydrology of the Baylands. The Draft EIR provides the terminology used in the original reports.
Basically, fill comprised of solid waste accepted by the landfill was placed on top of earthquake rubble that was placed on top of marine sediments to form land. Soil has been placed on top of the solid waste to prevent contact with the waste.