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Dames & Moore, 1999 - USDA Forest Service

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Surface Water<br />

Historic and 1997-1998 Railroad Creek and Copper creek analytical results were evaluated for the<br />

following areas:<br />

Railroad Creek adjacent to the Site<br />

Railroad Creek downgradient of the Site<br />

Copper Creek<br />

Copper Creek Diversion<br />

Samples collected from the Copper Creek diversion were assessed in the human health risk assessment to<br />

evaluate exposure in the sauna dipping pond. Hydroelectric plant outtlow, which originates from the<br />

Copper Creek diversion, is discharged to the sauna dipping pond. Surface water concentrations were used<br />

to evaluate risks to humans from consuming fish from Railroad Creek.<br />

Groundwater<br />

The only groundwater samples evaluated in the human health risk assessment were those collected in 1997<br />

from the USFS well at Lucerne that is reportedly used seasonally for drinking water. No exposure to ground<br />

water at the Site or at Holden Village was expected.<br />

Seeps<br />

Historic and 1997-1998 seep data (all data except non-mine influenced locations) were evaluated.<br />

1500-Level Mine Portal Drainage<br />

Historic and 1997- 1998 1500-level mine portal drainage data were evaluated.<br />

1500-Level Ventilator Portal Seepage<br />

One 1998 sample was evaluated.<br />

Air<br />

Post-remediation air monitoring data collected in 1994 by the USFS were evaluated in the human health risk<br />

assessment.<br />

Fish<br />

Fish muscle tissue samples were analyzed for metals by Pacific National Laboratories (PNL, 1992) in 1989<br />

and 1991 at four locations: upstream, at the Site. at Lucerne, and at 25-Mile Creek. Fish muscle tissue<br />

samples were also analyzed by Ecology in 1992 at approximately the same four locations. Mean muscle<br />

concentrations were evaluated in the human health risk assessment.<br />

G:\wpdruW5LepomU1oIdcn-2\ri\7O.doc '<br />

17693-005019Uuly 27. <strong>1999</strong>,5:16 PM;DRAFT FINAL RI REWRT

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