Dames & Moore, 1999 - USDA Forest Service

Additionally, the data at P-1 were also compared to Washington State ground water criteria (WAC 173-
200) and MTCA Method B cleanup levels for groundwater. The following PCOCs were identified at P- 1
and P-5.
Surface
Water
Criteria
Groundwater
Criteria
Locations
P- 1
P-5
P-l
8.3.3.3 Copper Creek Diversion
The Copper Creek diversion reflects water which is diverted fiom Copper Creek upstream of the Site and
flows through the hydroelectric plant. The water was sampled during the April, MayIJune, July, and
SeptemberIOctober events. The results of the analyses indicate that concentrations of cadmium, copper, and
zinc were above regulatory thresholds for the spring sampling event only.
8.3.3.4 Copper Creek
July 1997
Cd Cu. Pb, Zn, pH
Cd, Cu, Pb, Zn, pH
Cd, Cu. Pb, Zn, SO4,
PH
September 1997
Cd, Cu, Zn
Cd, Zn, pH
Cd. SO4, TOS
' May 1998
Cd. Cu. Pb. Zn, pH
Cd. Cu. Pb. Zn, pH
Cd. Cu, Fe. Pb. Zn, So4,
TOS. pH
Copper Creek, both upstream and adjacent to the tailings piles, was sampled during the MaylJune, July, and
SeptemberlOctober events. No PCOCs were identified for Copper Creek.
8.3.3.5 Lake Chelan
May 1997
Be, Cd, Cu, Pb, Zn, pH
Cd, Cu, Pb, Zn, pH
As, Be, Cd, Cu, Pb, Zn,
Sod, pH
Water quality samples were collected by Ecology in Lake Chelan near the mouth of Railroad Creek in 1989.
The samples were analyzed only for arsenic, iron, and zinc. All of the results were noted to be below
applicable aquatic.life, water quality, and drinking water standards.
8.3.3.6 Aquatic Reference Reaches
Water quality samples were collected during the aquatic biota surveys conducted during the
SeptemberlOctober event. The sampling was completed at one site each on Bridge Creek, South Fork of
Agnes Creek, and Company Creek. At the South Fork of Agnes Creek station, lead and silver were detected
at or slightly above chronic and acute criteria, respectively.
8.3.4 Groundwater
Groundwater samples were collected fiom selected groundwater monitoring wells installed across the
tailings piles and a small portion of the western portion of the Site by others in 1991 and 1994; the western
portion of the Site is defined as the general area to the west of the Copper Creek Diversion and southwest of
tailings pile 1. Seeps were also sampled across the Site and the data were used to assess groundwater
quality. The wells and seeps were sampled during the MayIJune and SeptemberIOctober 1997events. In
addition, selected seeps were again sampled during the May 1998 event.
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17693-005-OI9Uuly 28. 1999:10:24 AM;DRAFT FINAL RI REPORT