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Dames & Moore, 1999 - USDA Forest Service

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8.3 SITE CONTAMINANT CHARACTERIZATION<br />

8.3.1 Introduction<br />

Site surface and subsurface soil, surface water, groundwater, seeps, sediment, and flocculent were analyzed<br />

principally for organic compounds as outlined in the Draft Work Plan, and Sampling and Analysis Plans.<br />

Additional select areas and matrices were analyzed for organic compounds. This section summarizes the<br />

designation of potential compounds of concern (PCOC). The designation of a matrix as a PCOC indicates<br />

that it exceeds a regulatory standard for screening purposes only, but does not necessarily signify that the<br />

compound presents risk to human health and the environment. A complete discussion of the results of each<br />

sample matrix was previously provided in Section 5.0, and the results of the human health and ecological<br />

risk assessment are presented in Section 7.0.<br />

8.3.2 Soil<br />

8.3.2.1 Mine Support Area<br />

Maintenance Yard<br />

Surface Soils<br />

Arsenic, cadmium, copper, iron, lead, and total petroleum hydrocarbons were identified in five soil samples<br />

as PCOCs.<br />

Subsurface Soils<br />

Total petroleum hydrocarbons were identified in two subsurface samples as PCOCs.<br />

Lagoon<br />

Surface Soils<br />

Beryllium, iron, and total petroleum hydrocarbons were identified as PCOCs in one soil sample collected in<br />

the lagoon.<br />

Subsurface Soils<br />

Cadmium, copper, lead, iron, and total petroleum hydrocarbons were identified as PCOCs in ten subsurface<br />

soil samples collected in the lagoon.<br />

8.3.2.2 Tailings Piles<br />

Surface Soils<br />

Iron was identified as a PCOC in nine surface soil samples collected from the tailings piles.<br />

\U~M~SEAI\V~LI\C~MM~MWP\WDATA\~~S\REP~RTSW~LDEN-~UU\~-~.~OE<br />

8-26<br />

17693405-019Uuly 28. <strong>1999</strong>;10:24 AMDRAFT FINAL RI REPORT<br />

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