Special Notice: INTERIOR, DEPARTMENT OF THE, NATIONAL PARK SERVICE intends to sole source the maintenance of Alfa Laval Centrifuge Decanters at El Portal Wastewater Treatment Plant in Yosemite National Park, Mariposa County, California. The decanter centrifuge is used for water purification and sewage treatment equipment. For more information, contact Timothy Modjeski at Tim_Modjeski@nps.gov or 3038199916.