Dames & Moore, 1999 - USDA Forest Service

Ecology's FSQVs. The reference concentratioris as well as individual sample concentrations did not
exceed the FSQVs.
The concentration of metals detected at Lucerne were compared to reference concentrations and FSQVs.
Concentrations of cadmium, copper, iron, and zinc were above reference concentrations. ' Cadmium and
copper were below FSQVs. Zinc was below the FSQV at all sample locations with the exception of one.
The zinc concentration (426 mgkg) at LUC-SED- 10 1598-5- 1 was just above the FSQV (4 10 mag).
Iron concentrations ranged from 15,400 to 52,800 m ag. Iron detected at sample locations LUC-SED-
10 1598-3-2 and LUC-SED- 10 1598-5- 1 was 33,200 mgkg and 52,800 mgkg, respectively. The reference
concentration was 32,297 mgkg.
5.5.3 Summary
Metal concentrations detected in sediment collected from Railroad Creek, tributaries to Railroad Creek,
and from Lake Chelan at the Lucerne bar and Stehekin were compared to FSQVs and upstream or
reference concentrations as appropriate. Concentrations were above FSQVs at only one station located in
the Copper Creek diversion for copper only, and at one sample location at Lucerne bar for zinc only.
In Railroad Creek, metal concentrations of cadmium, copper, iron, lead, and silver in sediment samples
adjacent to and downstream of the Site were above upstream condentrations at limited locations, but were
not above FSQVs. Iron concentrations were relatively consistent in Railroad Creek from upstream to
downstream stations with a single exception located adjacent to the Site that was above upstream
concentrations.
Cadmium, copper, iron and zinc in sediment samples collected at Lucerne bar were above reference
concentrations but below FSQVs with a single exception for zinc.
Zinc in Railroad Creek sediments increased from upstream stations to stations adjacent to the Site,
stabilized downstream of the Site and then increased in Railroad Creek at Lucerne. USGS station 354 is
the furthest downstream station and located at Lucerne. Zinc at this location was 330 m ag, similar'to
the concentrations detected in Lake Chelan sediments.
5.6 OTHER MEDIA
During the 1997 investigation, other media present in the creek bed were sampled and included: flocculent
and precipitate from the portal drainage (portal film), flocculent and precipitate in Railroad Creek adjacent
to the tailings piles (flocculent), and samples of the cemented iron-oxide ferricrete accumulated along the
south bank of the creek adjacent to tailings pile 1 and tailings pile 2. The flocculent and film that were
collected consisted of a coating on the larger substrate materials, and also included small size particles
deposited within the interstices of the larger grain sizes. The ferricrete samples were obtained by breaking
up large solidified blocks of the material that had formed on the south bank adjacent to tailings pile 1. Only
the flocculent and precipitate are assumed potentially transportable downstream.
The analytical results for the ferricrete, flocculent and portal film samples collected in 1997 during the R1
are presented on Table 5.6-1. Sample locations are shown on Figure 5.6.1.
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