[en] The 1300-N Emergency Dump Basin (EDB) is a carbon steel lined retention basin with a one million gallon capacity (3.7 million liters) (Figure 1). It was originally designed to receive primary coolant water during an emergency from the 100-N Reactor, although it was never used for that purpose. However, the EDB was later used as a holding basin for water periodically generated during the N Reactor steam generator blowdown operations until 1987 when N Reactor was shut down. In 1991, approximately 20,000 gallons (75,750 liters) of water was transferred to the EDB from the Lift Station. There is currently 400,000 gallons of water in the basin which consists mainly of filtered water which was added to control contamination. Wind-blown dust and debris has created a sediment layer on the bottom of the basin. This sediment has been classified as mixed waste and has a wet, settled volume estimated at 1664 ft³(47m³). As part of the stabilization process, the majority of the remaining EDB water will be pumped to the 109-N sumps for later treatment and disposal. Sediment will be removed with the remaining water using a slurry process (similar to a vacuum process), and will be packaged in a moist condition in order to prevent potential airborne releases. The liner will then be stabilized and left intact until area remediation has begun. Periodic surveillance and maintenance will be conducted until the site is remediated