OR-SHELDON-HART MTN NWR CX-The U.S. Fish and Wildlife Service requires commercial vault toilet pumping services on an as-needed basis at Sheldon National Wildlife Refuge, Denio, Nevada. The requiremen... OR-SHELDON-HART MTN NWR CX-The U.S. Fish and Wildlife Service requires commercial vault toilet pumping services on an as-needed basis at Sheldon National Wildlife Refuge, Denio, Nevada. The requirement includes pumping, servicing, waste transportation and disposal, spill prevention and cleanup, and protection of the public and Government personnel, as described in Attachment 1, Performance Work Statement.