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Dames & Moore, 1999 - USDA Forest Service

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5.4.2.4 Waste Rock Piies<br />

Seep samples associated with the two waste rock piles adjacent to (east and west of) the abandoned mill<br />

building were sampled in 1997. Sample locations are shown on Figure 5.4-1, and analytical data is<br />

summarized in Table 5.4-2.<br />

West Waste Rock Pile<br />

Seep SP-6 originates from the base of the west waste rock pile. A sample was collected in May 1997.<br />

Concentrations of aluminum (14,600 pa), cadmium (173 pa), copper (12,700 pa),. manganese<br />

(1,160 p a), and zinc (22,100 pg/L) were above concentrations detected in additional seep or pond areas<br />

associated with the waste rock pile, as discussed below. Iron was detected at 30 p a. pH was acidic (4.2<br />

SU). The seep was not flowing during sampling events in June, July, and September 1997, thus only one<br />

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

The inferred flow path of water exiting the west waste rock pile at SP-6 indicates that seeps SP-1 5W and<br />

SP- 1 SE followed by SP- 16 (lagoon) are related. Samples were collected at SP- 15W in May 1997 and at<br />

SP-I 5E and SP-16 in May, July, and October 1997. Additionally, samples were collected at SP- 15E<br />

weekly from May 22 to June 16, 1997 to assess event-related variability.<br />

Concentrations of aluminum, cadmium, copper, iron, manganese, and zinc at locations SP- 15 W, SP- 1 SE,<br />

and SP-16 ranged from

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