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<br />wen brdy and s...fvy M1bn., yµn ~,,,~~~~,,,,~. <br />in detail in Section 2.6, is used extensively for prospecting and mining of uranium and vanadium. <br />' 3.1.4 Human Exposure Pathways <br />Identification of exposure pathways, especially the exposure points, is a key element in <br />' determining data needs for risk assessment. If, for example, receptors inhabit locations neaz <br />exposure points likely to be strongly affected by contaminant transport, then detailed data on <br />' concentrations of contaminants in the endvonmental media aze required to calculate incremental <br />risk or health hazard due to the exposure scenarios. If, on the other hand, the receptors either <br />' do not continuously inhabit locations neaz exposure points or are expected to be exposed only <br />razely due to an advertent intrusion (i.e., the trespasser scenario), then collection and analysis of <br />' detailed data concerning concentrations of potential contaminants are not required; a qualitative <br />discussion of risk is sufficient to evaluate whether or not the site represents a risk to human <br />health. <br />' As discussed in Section 2.1, the neazest residents reside in Nucla, Colorado, which is 16 miles <br />away from these mine properties. Also, as discussed in Section 2.9, no transport to surface water <br />streams is possible. Therefa~re, as the conceptual model shows, runoff to surface water is an <br />incomplete exposure pathway for downstream residents, and no local residents reside at the mines. <br />' For the trespasser scenario, intruders to the properties could be exposed by dermal contact, but <br />no more so than to countless other rocks in the azea. Ingestion or inhalation would also be no <br />' greater than that due to backt~ound conditions. Therefore, all of these uptake mechanisms aze <br />considered relatively insignificant. <br />1 <br />1 <br />' x:wsExsmu*nwnxanvFrftns cswsur~svn an' <br />Page 14 <br />1 <br />