Guidance Manual for Conducting Screening Level Ecological Risk Assessments at the INEL

Screening Level Risk Assessment for the New Waste Calcining Facility

“…Quantified critical exposure levels (QCELS) and adjustment factors (AFs) were constructed from the literature to develop appropriate TRVS for receptors associated with NWCF contaminant pathways. Criteria for development of these TRVS are discussed in Appendix G. In general, the criteria incorporate the requirements for appropriate measurement endpoints, including relevance to an assessment endpoint, applicability to the route of exposure, use of existing daa and consideration of scale (VanHorn et al, 1995).…”

“…The concentration of contaminant in vegetation (CV) can be estimated using the equation (VanHorn et al 1995):…”

“…The concentration of contaminant in prey can be estimated using the equation(VanHorn et al, 1995):CP=CSXCF (8-2)where CP = concentration in prey item ingested (mglkg) Cs = concentration of contaminant in soil (mg/kg) CF = contaminant-specific bioaccumulation factor (unitless). estimated exposure from all soil exposure pathways (mg/kg body weight-day) percentage of diet represented by prey ingested (unitless) concentration of contaminant in prey item ingested (mglkg) percentage of diet represented by vegetation ingested (unitless) concentration of contaminant in vegetation ingested (mglkg) percentage of diet represented by soil ingested (unitless) concentration of contaminant in soil ingested (mg/kg)…”