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Dames & Moore, 1999 - USDA Forest Service

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Surface Soil<br />

For the purposes of the human health risk'assessment, surface soil data collected from the upper six<br />

inches of soil was divided into the following areas based. on physical location and/or exposure<br />

chqacteristics: .- - .<br />

Subsurface Soil<br />

Holden Village (historic and 1997 data)<br />

Holden Village vegetable garden (1997 data)<br />

Baseball field (1997 data)<br />

Wilderness boundary (1997 data<br />

Maintenance yard (1997 data)<br />

Lagoon area (1 997 and 1998 data)<br />

USFS guard station (historic data only)<br />

Subsurface soil data was not used in the baseline risk assessment because there is no current or reasonably<br />

foreseeable future exposure to subsurface soil. There is no anticipated future change in the current land uses<br />

that would indicate future exposures to subsurface soil.<br />

Tailings<br />

Historic and 1997 data from all three tailings piles were combined for the risk assessment. Subsurface<br />

tailing samples were not used in the assessment since there is no reasonably foreseeable exposure. Wind<br />

blown tailings sample data were combined with surface tailings data.<br />

Sediment<br />

For the purposes of the human health risk assessment, sediment, flocculent and concentrate sample data<br />

were combined. These three media were assumed to represent human exposure to sediment-like materials<br />

during recreational activities. The combined data sets were evaluated for the following exposure areas:<br />

Railroad Creek adjacent to the Site (historic and 1997 data)<br />

Railroad Creek downgradient of the Site (historic and 1997 data)<br />

Copper Creek (historic data)<br />

Copper Creek Diversion (1993 USGS data)<br />

G:\~u~~\hoIdm-2\n~7-O.doc 7-4<br />

17693M)S419Uuly 27,19W;J:16 PMDRAFT FINAL RI REPORT

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