In recent years, DWMR has utilized tire-derived aggregates (TDA) as a replacement material for high permeability aggregate and rubble in roadway and tipping pad construction. The California Department of Resources, Recycling, and Recovery (CalRecycle) supplied TDA via a grant for the initial project. Subsequently, DWMR was awarded a $49,004 grant for the utilization of TDA at Kiefer Landfill. In 2015, 224,686 passenger tire equivalents have been recycled. Recycling and reuse of waste tires is a significant initiative for CalRecycle.