Dames & Moore, 1999 - USDA Forest Service

I
Concentrations of aluminum, cadmium, copper, manganese, and zinc at SP-23 in May were 2 to 6 times
above concentrations detected at SP-12. The two locations were sampled on the same day during the May
field event.
A sample (A-1) was collected fiorn ponded water behind the partially collapsed opening at the 1 100 level
portal in July 1997. Aluminum and iron were not detected. Cadmium (2.32 p a), copper (120 l a),
manganese (27.8 p@), and zinc (257 pg/L) were detected. A field pH measurement was collected and
indicated a neutral pH (8 SU). The concentrations of aluminum, cadmium, copper, manganese. and zinc
at A-1 in July were below concentrations detected at SP-14 Lower in October 1997 and at the SP-23
locations sampled in May, June, July, and October 1997.
Comparison to Groundwater Quality Criteria
The data were compared to criteria designated in MTCA and WAC 173-200. The following PCOCs were
identified based on this evaluation.
Summary
SP- 14 Upper
SP-14
SP-14 Lower
SP-23 UP
SP-23 Vent Rd
SP-23
SP-23B
SP- 12
A- l
Spring
Not Sampled
Cu pH
Not Sampled
Not Sampled
Not Sampled
Cd, C& Zn, pH
Cd, Cu, pH
C4 Cu, pH
Not Sampled
Summer
Not Sampled
Not Sampled
Not Sampled
C4 Cu
Not Sampled
Not Sampled
Not Sampled
Cd Cu, pH
None
Fall
pH (storm event)
Fe. pH
Cd, Cu, pH (storm event)
Not Sampled
Cd. Cu, pH (storm event)
Cd Cu, pH (storm event)
Not Sampled
Not Sampled
Not Sampled
Samples were collected in the Honeymoon Heights Drainage from above the ore body (SP-14 Upper) to
Railroad Creek (SP-23, SP-12). A sample (A- 1) was also collected from ponded water at the 1 100 portal
located in the drainage. Concentrations of aluminum, cadmium, copper, manganese, and zinc increased
from SP-14 Upper to SP- 14 Lower and again fiom SP- 14 Lower to SP-23. Iron was not detected or
detected at or near the detection limit at all sample locations during each field event with one exception.
Iron was detected at SP-14 in September 1997 at a concentration of 480 pa. Concentrations of aluminum, cadmium, copper, manganese, and zinc detected at SP-12 were 2 to 6 times
below concentrations at SP-23. Iron was not detected. Concentrations of these metals detected at A-1
were below those detected at SP-23 and SP- 14 Cower.
Cadmium, copper and zinc were identified & PCOCs at various sample locations in the Honeymoon
Heights drainage. Additionally, pH was identified as a PCOC at some locations as the measured values
ranged from 4.5 to 6.1 SU, outside of the 6.5 to 8.5 SU criteria (WAC 173-200). Samples collected in the
fall were generally the result of a precipitation event.
\U)M-SEAI\VOLl\COMMOMWP\WPDATA\005UIEPORTSWOLDEN-2WU-O.d 5-45
17693-005-019Vuly 28.1999;l l:W AM;DRAFT FINAL RI REPORT