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Dames & Moore, 1999 - USDA Forest Service

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9.0 CONCLUSIONS AND RECOMMENDATIONS<br />

The data collected during the course of the RI are sufficient to define the nature and extent of compounds of<br />

concern, the pathways and receptors of concern and to serve as a basis to complete the Feasibility Study. The<br />

objectives, conclusions and recommendationsand key findings of the RI are summarized in this section. One<br />

remaining RI data collection activity has been identified by the Agencies in order to augment or clarify<br />

specific findings and conclusions related to sediment. The results will be appended to this document after the<br />

field data collection and analyses are completed.<br />

9.1 OBJECTIVES OF THE RI<br />

The RI objectives have been addressed as follows:<br />

a The environmental setting of the Site has been characterized<br />

a The presence, magnitude, nature and extent of potential environmental concerns determined to<br />

be associated with historic mining activities have been defined<br />

• The potential pathways and rates of migration of compounds of potential concern on the Site<br />

have been characterized<br />

a The potential receptors of compounds of potential concern associated with the historic mining<br />

at the Site have been evaluated<br />

• The stream habitat has been characterized<br />

a The analytical data generated from the investigation in terms of applicable, relevant, and<br />

appropriate regulations, including both state and federal requirements, have been evaluated<br />

• Relevant data of sufficient quality have been provided so that the FS can evaluate cost-<br />

effective remedial alternatives that will address significant environmental concerns identified<br />

on the Site.<br />

9.2 CONCLUSIONS<br />

Referring to Figures 9.2- 1 through 9.2-5, the RI conclusions are described below:<br />

9.2.1 Host Rock Mineralogy<br />

The Holden Mine ore deposit is hosted by the Buckskin Schist. which is a quartz amphibole<br />

schist sequence with at least two horizons of intermittent marble beds and calcareous schists.<br />

The dominant silicates are plagioclase and biotite (aluminum-based). The primary sulfide<br />

minerals in the Holden Mine ore deposit include pyrite, pyrrhotite, sphalerite and chalcopyrite.<br />

G:\WPDATA\OO5\REPORTSWOLDEN-ZUU\9-OOd~ 9- 1<br />

17693-005-019Uuly 28. <strong>1999</strong>;10:07 A M;DW FINAL R1 REPORT

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