Conceptual Site Model - Argonne National Laboratory

WVDP Phase 1 CSAPA.4.3.6Interceptor System Operational ReleasesPotentially Affected Media: surface soil, subsurface soil, groundwaterPotentially Affected WMAs: 1, 2During NFS operations, several incidents such as inadvertent transfers of higher-than-intendedactivity occurred in the Interceptor system (in WMA 2), upstream of the Lagoons (also inWMA 2). Documented accounts of leakage and spills in the Interceptor area corroborate thegenerally elevated observed subsurface soil contamination in the area between Lagoon 1 and theProcess Building. Localized subsurface soil contamination can be attributed to these unintendedoperational releases.A.4.3.7Waste Tank Farm Condensate Line LeakPotentially Affected Media: subsurface soil, groundwaterPotentially Affected WMAs: 1, 3Several leaks occurred between 1968 and 1977 that were associated with a condensate line (Line8P-46-6-A5) from Tank 8D-2. The leaks occurred in the section of the line between theEquipment Shelter (in WMA 3) and the Process Building acid recovery pump room (in WMA 1).This line was maintained under vacuum. An unexpected 16,400-gallon liquid volume increase inTank 8D-2 was attributed to groundwater leaking into the line and being drawn into the tank.There is no surface evidence of out-leakage, but the possibility exists of localized groundwatereffects (DOE 2009 Table 2-17; DOE 2010 Section 3.11.5).A.4.3.8Process Building Stack ReleasePotentially Affected Media: surface soilPotentially Affected WMAs: 1, 3In 2001, airborne particulate was released in droplet form from the stack of the Process Building.Excess moisture appears to have become entrained in the ventilation system, and was emittedfrom the stack as droplets containing radioactive particulates. The release occurred over a periodof two months (September – October 2001). The radioactivity release rate was too low to result inRev. 1 A-8