Mary Shanks, Solid Waste Project Manager, HDR, Inc.

This SWANA Webinar examines the work HDR and King County Solid Waste Division did to evaluate options for refuse removal from a portion of the Cedar Hills Regional Landfill and determine an optimal construction scenario.

The South Solid Waste Area (SSWA) is a 24 acre, unlined cell containing approximately 450,000 cubic yards of refuse dating back to the 1960s. The site is part of the larger Cedar Hills Regional Landfill (CHRL) The SSWA was closed in 1988 when a final cover system was installed, along with landfill gas and leachate management systems.

As a part of further landfill development at Cedar Hills Regional Landfill, stormwater management facilities are planned to be relocated into the South Solid Waste Area footprint. This required excavation of the existing material there. This presentation presents the evaluation process used for the excavation alternatives, including the criteria such as performance, airspace utilization, and cost.

The preferred option was removal of all waste from the South Solid Waste Area, along with relocation of an existing water supply line and fiber optic and electrical conduits.

Options were considered for the following elements:

• Excavation footprint
• Excavation responsibility, methodology, and schedule
• Waste screening methods
• Stockpile configuration
• Odor control
• Environmental controls

This webinar looks at the range of factors involved and the results of the operation. This is a can't miss event for anyone needing to relocate a landfill cell.