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<br />Wrn Surda~ and Sundry Afimf <br />• Human Exposure Pathways <br />A4p fiernp,w~vSY.'w.y <br />- If receptors live near exposure points likely to be strongly affected b}' contaminant <br />transport, detailed data on concentrations of contaminants in the environmental <br />media aze required to calculate incremental risk or health hazard due to the <br />exposure scenanos. <br />- If receptors either do not continuously inhabit locations neaz exposure points or <br />are expected to be exposed only rarely due to an advertent intrusion (i.e., the <br />trespasser scenario), then collection and analysis of detailed data concerning <br />concentrations of potential contaminants aze not required; qualitative discussion of <br />risk is sufficient to evaluate whether or not the site represents a risk to human <br />health. <br />• Neazest residents reside in Nucla, Colorado, 16 miles away from these mine properties. <br />• No transport to surface water streams is possible. <br />• Conceptual model shows, runoff to surface water incomplete exposure pathway for <br />downstream residents. No local residents at the mines. For trespasser scenario, intruders <br />to the properties could be exposed by dermal contact, but no more so than to countless <br />other rocks in the area. Ingestion or inhalation would also be no greater than that due to <br />background conditions. <br />- Therefore, all of these uptake mechanisms aze considered relatively insignificant. <br />N'\USFASUffIMWPVAIRLLEITFJIS 95\W SUNSUN P0.E <br />Page 17 <br />