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7.2 Source Characterization <br /> 7.2.1 CDPHEInvestigation <br /> CDPHE collected 7 solid-matrix samples of source materials during its investigation in <br /> 2000. Samples of solid-phase source materials were designated with the prefix WS <br /> (waste source). They were collected from the waste-rock dumps and fine-grained <br /> tailings piles associated with the IXURoyal Tiger site(CDPHE, 2002). Sample locations <br /> are shown in Figure 2 reproduced from the CDPHE(2002)report. <br /> CDPHE submitted samples of solid-phase source materials for analysis of the following <br /> characteristics: <br /> • Acid-base Accounting(ABA)—4 samples <br /> • Physical&engineering properties <br /> • Inorganic constituents <br /> • Toxicity Characteristic Leaching Procedure(TCLP)—3 samples <br /> CDPHE collected samples of water discharging from the IXURoyal Tiger adit at three <br /> locations. Water samples were collected at the mouth of the adit;along the channel <br /> leading from the adit at a point below the waste-rock dump;and at the downstream end <br /> of the wetlands area immediately above the point of discharge into a ditch along the <br /> south side of the Swan River valley. <br /> 7.2.2 ABC Investigation <br /> ABC collected samples of waste rock and tailings materials in May 2000. Samples were <br /> analyzed for metals. Samples of the adit discharge were collected in June 2000 and <br /> analyzed for metals. <br /> ABC conducted reconnaissance surface-water sampling at several locations in the <br /> vicinity of the IXURoyal Tiger site in October 1998,February 1999 and May 1999. <br /> These sampling events included collection of samples from the adit discharge. <br /> 7.2.3 Results and Discussion <br /> i Analytical results from the two investigations indicate that the principal contaminants of <br /> concern(COCs)at the IXLRoyal Tiger site are arsenic,cadmium,copper, lead, <br /> mercury,and zinc. In anticipation of future land use for recreation and natural <br /> preservation,the analytical results can be compared to the BLM Risk-Management <br /> Criteria(RMC)(Ford, 1996)for human recreational use and for wildlife protection. A <br /> streamlined risk assessment is presented in Section 8 below. <br /> Tailings and Waste Rock Characterization <br /> Results of the source characterization sampling and analyses for solid-phase samples <br /> conducted by CDPHE are summarized in Table 2 to Table 4. With the exception of <br /> copper, results of the sampling and analyses performed by ABC are summarized for the <br /> COCs in Table 5. Results for copper analyses were not included in the partial <br /> documentation of the ABC investigation available at the time this application was <br /> prepared. <br />