Title: Evaluating Ground-Water/Surface-Water Transition Zones in Ecological Risk Assessments 
Resource Type: document --> public information 
Country: USA 
Year: 2008 
Availability: Joint Document of the Ecological Risk Assessment Forum and the Ground Water Forum Publication 9285.6-17 EPA-540-R-06-072 July 2008 
Author 1/Producer: US Environmental Protection Agency (US EPA) 
Author / Producer Type: Agency, regulator or other governmental or inter-governmental body 
Report / download web link (=direct link): http://www.epa.gov/oswer/riskassessment/ecoup/pdf/eco_update ...  
Format (e.g. PDF): PDF 
Size: (e.g. 20mb) 1 
EUGRIS Keyword(s): Sediments
Water resources and their management -->River basins
Water resources and their management -->Stresses, quality and ecological status
Short description: his document highlights the need to treat the discharge of groundwater to surface-water not as a two-dimensional area with static boundary conditions, but as three-dimensional volumes with dynamic transition zones. This ECO Update applies equally to recharge zones and can be used to evaluate advancing plumes that have not yet reached the transition zone. This document encourages project managers, ecological risk assessors, and hydrogeologists to expand their focus beyond shoreline wells and surface sediments and define and characterize the actual fate of contaminants as they move from a strictly ground-water environment (i.e., the commonly used 'upland monitoring well nearest the shoreline') through the transition zone and into a wholly surface-water environment. The approach is presented to help users identify and evaluate potential exposures and effects to relevant ecological receptors within the zone where ground-water and surface-water mix. The transition zone data collected for the ERA may also supplement data collected for the evaluation of potential human health risks associated with the discharge of contaminated ground-water. Should ground-water remediation be warranted (as a result of the risk assessment), the locational, geochemical, and biological aspects of the transition zone can be considered when identifying and evaluating remedial options 
Link to Organisation(s): EPA Environmental Protection Agency
Submitted By: Professor Paul Bardos WhoDoesWhat?      Last update: 04/12/2008

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