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Dames & Moore, 1999 - USDA Forest Service

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collected as these seeps were not flowing in July or September. The concentrations of aluminum,<br />

cadmium, copper, and zinc at SP-11 were approximately 5 to 150 times the concentrations detected at SP-<br />

9. Iron was not detected at either location. Manganese was not detected at SP-9 and was detected at a<br />

concentration of 37.3 pg/L at SP-I 1. Field pH measurements at the two locations ranged from 5.8 to 6.4<br />

su.<br />

The concentrations of aluminum, cadmium, copper, manganese, and zinc detected at seep SP-11 were<br />

well below concentrations at SP-16 detected in May. Iron was similar.<br />

Samples were collected from SP-16 in May and July 1997 for analysis of PCBs and total petroleum<br />

hydrocarbons (TPH). PCBs were not detected and this analysis was eliminated in the fall 1997 sampling<br />

event. TPH in the motor oil range was detected in July 1997. A sample was collected in September 1997<br />

>and analyzed for TPH. TPH was not detected.<br />

The data for seeps associated with the west waste rock pile were compared to groundwater quality<br />

criteria. The following PCOCs were identified.<br />

SP-6<br />

SP-ISE<br />

SP-ISW<br />

SP-16<br />

SP-9<br />

SP-1 I<br />

TDS -Total Dissolved Solids<br />

East Waste ~ock'pile<br />

Spring<br />

Cd, Cu, Mn, Zn, TDS, SOc pH<br />

Be, Cd, Cy Zn, pH<br />

Cd<br />

Cd, Cu, Zn, pH<br />

PH<br />

As, Cd, pH<br />

Summer<br />

Not Sampled<br />

Cd, Cu<br />

Not Sampled<br />

Cd, Cu, Fe, Mn. Zn, pH<br />

Not Sampled<br />

Not Sampled<br />

Fall<br />

Not Sampled<br />

Cd, Cu, Zn, pH (storm event)<br />

Not Sampled<br />

Cd, Cu, Mn, pH<br />

Not Sampled<br />

Not Sampled<br />

Seep SP-8 originates from the base of the east waste rock pile. A single sample was collected in May<br />

1997. Concentrations of aluminum (9,620 pg/L), cadmium (87.8 pg/L), copper (7,880 pg/L), manganese<br />

(419 pg/L), and zinc (1 1,200 pg/L) were above concentrations detected in seeps associated with SP-8 as<br />

discussed below. Iron was detected at a low concentration of 30 p a. pH was acidic, 4.6 SU. The seep<br />

was not flowing during sampling events in June, July, and September 1997, thus only one sample was<br />

collected during the spring snowmelt in May.<br />

The inferred flow path of water exiting the waste rock pile at SP-8 indicates that overland seep SP-19 and<br />

seeps SP- 1OW and SP-1OE are related. Samples were collected at SP-19, SP-IOE, and SP- I OW in May<br />

1997 and additionally at SP-IOW in July 1997. Concentrations of aluminum, cadmium, copper,<br />

manganese, and zinc continually decrease in May from SP-8 to SP- 19 and finally to SP- I OE and SP- 1 OW<br />

located at Railroad Creek. Iron ranges from 30 to 70 pg/L at SP-8, SP-19 and SP-IOW. Iron (14,100<br />

pa) at SP-IOE is significantly above concentrations in the other related seeps including SP-8 and<br />

appears to be influenced by tailings pile 1. Field pH measurements at SP-19 and SP-I OW ranged from<br />

4.2 to 4.7 SU. The pH measured at SP-IOE was 3.3 SU.<br />

\\DM-SEA I\VOL I\COMMOMWP\WPDATAU)O5~REPORTSWOLDEN-2UUU 5 -47<br />

17693-005-019Uuly 28. <strong>1999</strong>;11:09 AM;DRAFT FINAL RI REPORT

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