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Dames & Moore, 1999 - USDA Forest Service

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maintenance building, which also houses the Holden Village potable water treatment system, was<br />

constructed in 1998 to the east of the older maintenance building and to the north of the mill structure.<br />

8.2.5.3 Winston Home Sites Underground Storage Tanks a<br />

The assessment of the underground storage tanks (USTs) in the Winston Home Sites area documented the<br />

presence of approximately 38 USTs and 2 above-ground storage tanks (ASTs). Test pit excavations<br />

completed immediately down slope of eight USTs and the Winston home sites area did not detect petroleum<br />

hydrocarbons in soil.<br />

The tanks are not regulated under State of Washington or federal UST regulations because they are less than<br />

1,000 gallons in size and have been used for home-related fuel storage for home heating. It has been<br />

reported by individuals who were at Holden Village as volunteers during the 1960s that the majority of fuel<br />

product in most, if not all, of the tanks was removed for use in Holden Village.<br />

8.2.5.4 Potential Borrow Source Areas<br />

The borrow source evaluation included the assessment of a rock quarry located in the eastern portion of the<br />

Railroad Creek drainage near Dan's Camp. The quarry was utilized as the source for the rip rap placed along<br />

the banks of Railroad Creek in 199 1. The rock exposed in the quarry was evaluated visually and with rock<br />

soundness testing method. The rock was determined not to be of sufficient quality to be utilized in the future<br />

as riprap.<br />

An alternative source of rip rap was investigated in a talus slope approximately one mile east of Holden<br />

village near the existing road to Lucerne. This potential source was evaluated by the USFS in 1989 as part<br />

of the tailings pile rehabilitation project. The rock was found to be of adequate quality to be used as riprap.<br />

This was supported by the findings of <strong>Dames</strong> & <strong>Moore</strong> in 1997. The source was reportedly eliminated for<br />

consideration by the USFS due to potential dangers associated with rock fall. However, it would appear<br />

feasible to remove the rock by incorporating all safety considerations in the design.<br />

A source of granular borrow material was discovered in the slope immediately southeast of tailings pile 3.<br />

Thk amount of material for future site activities, if necessary, will need to be hrther evaluated during design<br />

in order to determine if the source is of sufficient size and quality.<br />

8.2.6 Ecological Conditions<br />

8.2.6.1 Aquatic Biota<br />

The aquatic biota were evaluated by collecting both fish and benthic macroinvertebrates (aquatic insects)<br />

from selected reaches of Railroad Creek and control areas, or reference reaches, both in the Railroad Creek<br />

watershed and outside the watershed. Five sampling locations were selected within the segment of Railroad<br />

Creek adjacent to and downstream of the mine tailings piles. Two sampling stations were established<br />

upstream as control or reference sites for comparison to the reaches of Railroad Creek adjacent to and<br />

immediately downstream of the mine tailings piles. Three reference stations, Bridge Creek, South Fork of<br />

Agnes Creek, and Company Creek, were established in the Stehekin watershed, outside the Railroad Creek<br />

watershed, for comparison to reaches of the downstream segment (between RC-5 and RC- 10) and the mouth<br />

of Railroad Creek (RC-3).<br />

17693-005-019Uuly 28. <strong>1999</strong>10:24 AM;DRAFT FINAL RI REPORT

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