Dames & Moore, 1999 - USDA Forest Service

on the Site are presented on Figures 3.0-1, 3.0-2, and 3.0-3. Table 3.0-1 presents a key of site features
and media sarnpling/data collection locations utilizing the coordinates presented on the relevant figures.
A background of the Site history and past land uses for the different portions of the Site is presented in
Section 2 of this report and in the report prepared by Dames & Moore in September 1996, titled Exisring
Data Evaluation and Data Needs Assessment, Holden Mine Site, Chelan County, Washington. Sections 4
through 8 of this report provide added detail associated with the areas evaluated and the results of
laboratory and office analyses.
3.1 TASK 1 - GEOLOGY AND SOILS INVESTIGATION
3.1.1 Surface and Subsurface Soil Sampling
Referring to Figures 3.1 - 1 through 3.1-5 and Table 3.1- 1, surface soil samples were collected throughout
the area from background locations, Holden Village, the baseball field, the maintenance yard, the lagoon,
tailings piles, and downwind windblown tailings material during the R1; the upwind and downwind
portions of the Site were determined based on the results of studies and data from others (Air Resource
Specialists, 1994, and USFS onsite weather station data). The purpose of the sampling was to
characterize area background soils, and Site soils and tailings that may contain potential compounds of
concern associated with the historic mining operations.
Surface soil samples are defined as 0 to 6 inches below ground surface (bgs); surface soil samples were
collected from all of the above-mentioned areas. subsurface samples were defined as being collected
greater than 6 inches bgs. The subsurface soil samples were collected from the maintenance yard, lagoon,
and tailings piles.
Brief descriptions of the physical locations sampled are presented hereafter. A discussion of the geology
and soils related to these areas is presented in Section 4.2.3. The results of the laboratory analyses are
presented in Section 5.2.
3.1.1.1 Area Background
Nineteen area surface background soil samples (DMBG-I through DMBG-19) were collected from the
Railroad Creek drainage at locations hydraulically upgradient andlor sidegradient of mine influences.
The sample locations are shown on Figure 3.1-1. The samples were collected for metals analyses as
presented in Table 3.1 - 1. The results of the analyses are presented in Section 5.2.1.
3.1.1.2 Holden Village
Seven surface soil samples (DMSS-1 through 7) were collected throughout Holden Village, including one
sample from within the Holden Village vegetable garden (Figure 3.1-2). The samples were collected for
metals analyses as presented in Table 3.1-1. The results of the analyses are presented in Section 5.2.2.
3.1.1.3 Baseball Field and Wilderness Boundary
One surface soil sample was collected in the area of the baseball field to the west of Holden Village and
east of the wilderness boundary (DMSS-25). Two samples were also collected to the west of the
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