Current Conditions Risk Assessment for the 300-FF-5 Groundwater Operable Unit

Miley, Terri B. ; Bunn, Amoret L. ; Napier, Bruce A. ; Peterson, Robert E. ; Becker, James M.

关键词: CONTAMINATION;    ECOLOGICAL CONCENTRATION;    LAND USE;    MONITORING;    REMEDIAL ACTION;    RISK ASSESSMENT 300-FF-5;    Groundwater;    Risk assessment;    Human health;    Ecological;   

DOI  :  10.2172/927499
RP-ID  :  PNNL-16454 Rev. 0
PID  :  OSTI ID: 927499
Others  :  Other: 830403000
Others  :  TRN: US200816%%675

学科分类：环境科学（综合）

美国|英语

来源: SciTech Connect

【 摘 要 】

This report updates a baseline risk assessment for the 300 Area prepared in 1994. The update includes consideration of changes in contaminants of interest and in the environment that have occurred during the period of interim remedial action, i.e., 1996 to the present, as well as the sub-regions, for which no initial risk assessments have been conducted. In 1996, a record of decision (ROD) stipulated interim remedial action for groundwater affected by releases from 300 Area sources, as follows: (a) continued monitoring of groundwater that is contaminated above health-based levels to ensure that concentrations continue to decrease, and (b) institutional controls to ensure that groundwater use is restricted to prevent unacceptable exposure to groundwater contamination. In 2000, the groundwater beneath the two outlying sub-regions was added to the operable unit. In 2001, the first 5-year review of the ROD found that the interim remedy and remedial action objectives were still appropriate, although the review called for additional characterization activities. This report includes a current conditions baseline ecological and human health risk assessment using maximum concentrations in the environmental media of the 300-FF-5 Operable Unit and downstream conditions at the City of Richland, Washington. The scope for this assessment includes only current measured environmental concentrations and current use scenarios. Future environmental concentrations and future land uses are not considered in this assessment.