GBK has been involved with an ongoing project at Ft Sill to determine the ultimate discharge fate of floor drains on the installation. This work is being performed to ensure compliance under the National Pollution Discharge Elimination System. To date, GBK has assessed over 260 buildings, producing building and discharge data in the form of GIS facility maps and searchable spreadsheet and database formats. It has also peformed quality assurance checks on previous survey data and incorporated findings into these outputs.