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Dames & Moore, 1999 - USDA Forest Service

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. <<br />

The data from seeps SP-1 and SP-2 were compared to groundwater quality criteria as well as the<br />

monitoring wells. The following PCOCs were identified in monitoring wells and seeps associated with<br />

tailings pile 1.<br />

TPI-1A<br />

TPl-2A<br />

TPlJA<br />

TP I -4A<br />

TP 1 -5A<br />

TP 1 -6A<br />

SP-I<br />

SP-2<br />

Tailings Pile 2<br />

Spring<br />

Fe, Mn, TDS, so,, pH<br />

Be, Fe, Mn. TDS, SO,, pH<br />

Fe, Mn, Zn, TDS, SO,. pH<br />

None<br />

Fe, Mn, Zn, TDS, So,, pH<br />

Cd, Cu, Fe, Mn, Zn, TDS, SO4, pH<br />

Be, Cd, Cu, Fe, Mn, TDS, SO4. pH<br />

As, Be, Cd, Cy Fe, Mn, Zn, TDS,<br />

SO,, color, pH<br />

Summer<br />

Not Sampled<br />

Not Sampled<br />

Not Sampled<br />

Not Sampled<br />

Not Sampled<br />

Not Sampled<br />

Cd, Fe, Mn, TDS, SO4. pH<br />

Cd, Cu, Fe. Mn, TDS, SO4, color,<br />

PH<br />

Fall<br />

Fe, Mn. TDS. SO,, pH<br />

Fe, Mn ,TDS, SO,, pH<br />

Fe, Mn. TDS. SO4, pH<br />

so,<br />

Fe. Mn, TDS, SO4, pH<br />

Cd, Cy Fe, TDS. SO,, pH<br />

Not Sampled<br />

Fe, Mn, TDS. SO4, pH<br />

Groundwater samples were collected from monitoring wells (PZ-lA, PZ-lB, PZ-3A, TP2-4A, TP2-5A,<br />

TP2-8A, and TP2-1 IA), and seeps (SP-3 and SP-4) at the base of the tailings pile.<br />

Samples from monitoring wells PZ- I B, PZ-3A, TP2-4A, TP2-5A, TP2-8A, and TP2- 1 1 A were collected<br />

during two sampling events in the spring and fall of 1997. PZ-1A was sampled only in the spring as the<br />

well was dry in the fall. With the exception of PZ-lB, these wells were screened in the alluvial material<br />

underneath the tailings pile. PZ-1B was screened within the pilings. The data were compared to MTCA<br />

Method A and Method B cleanup levels. Metal concentrations were below MTCA levels with the<br />

exception of arsenic at PZ-3A, cadmium in the spring at TP2-8A, and manganese at wells PZ-IB, and<br />

TP2-8A. Arsenic at PZ-3A was 5 to 6 pg/L, just above the MTCA Method A level (5 pg/L). Cadmium<br />

was 7 pg/L at TP2-8A, just above the MTCA Method A level (5 pg/L). Manganese ranged from 1,120 to<br />

2,910 pg/L, above the MTCA Method B dleanup level of 747 pg/L. iron concentrations ranged from

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