AOC B – Wastewater Treatment Plant and Disposal Ground AOC B is the former NASD Wastewater Treatment Plant (WWTP), which operated from 1983 to 2000. This site is located at the southwest end of the former Main Operational Area and served as the primary domestic wastewater treatment system for the facility. The WWTP consisted of one aeration tank and one separation tank with two blowers to supply air for biological treatment. Effluent from the WWTP drained into a series of four self-contained lagoons with no discharge point. The lagoons were lined with compacted clay. The lagoon area is surrounded by an 8-foot-high cyclone fence as an access control measure to limit wildlife access to the site. No evidence has been uncovered to indicate that hazardous wastes were discharged to the WWTP. During the 2002 Phase II Expanded PA/SI, a total of 16 surface and 16 subsurface soil samples were collected from 16 locations within the treatment lagoons at AOC B. Due to the absence of site- related ecological or human health risk concerns, AOC B was recommended for NFA.

 

Investigation and Action:	Phase I RFI.
Site Status	No Further Action recommended (May 2003). EQB concurred with the No Further Action recommendation (February 2007)
Current Land Use	Municipality of Vieques