Letterkenny Army Depot Directorate of Public Works requires preventative maintenance for Badger flow meters that are located in the Industrial Wastewater Treatment Plant (IWTP) and regulate the plant ... Letterkenny Army Depot Directorate of Public Works requires preventative maintenance for Badger flow meters that are located in the Industrial Wastewater Treatment Plant (IWTP) and regulate the plant to keep it within the environmental standards. This requirement will be a purchase order for 1 Base Year and 4 Option Years.