The project involves replacement of liquid waste containment features to Waste Management Unit G (WMU-G), a class 2 (double lined) liquid surface impoundment at the Yolo County Central Landfill that was originally constructed in 1995. Wastes received in WMU-G include landfill leachate, septage, portable toilet and other non-hazardous liquid wastes. The primary containment features of the unit are nearing their useful life and must be replaced before failure. Additionally, the containment
benns around the unit must be raised to meet flood protection requirements, due to a change in special flood hazard area mapping at the Landfill.
Reconstruction activities consist of demolishing existing concrete, primary and secondary geomembranes, and associated features; extending perimeter berms and compacted clay portion of the containment system; reconstructing the primary and leak detection sumps; reinstalling new primary and secondary geomembranes; installing a new concrete wear surface over the entire unit; and, improving the customer dump locations. Reconstruction will occur within the existing unit footprint and involves a negligible expansion of use. During reconstruction, a temporary bin system for liquid waste customers will be maintained to ensure uninterrupted customer service.