Application of the Solute-Transport Models OTIS and OTEQ and Implications for Remediation in a Watershed Affected by Acid Mine Drainage, Cement Creek, Animas River Basin, Colorado

Walton-Day, Katherine ; Runkel, Robert L. ; Kimball, Briant A. ; Bencala, Kenneth E.
Organization: Society for Mining, Metallurgy & Exploration
Pages: 11
Publication Date: Jan 1, 2000
The solute-transport model OTIS and the reactive solute-transport model OTEQ were used to simulate geochemical conditions in Cement Creek, a tributary to the Anirnas River in Colorado. OTIS was used to depict instream zinc concentrations, and to simulate the effects of two remediation scenarios on zinc concentrations at the mouth of Cement Creek. These simulations do not account for effects of changing stream pH on metal concentrations. Preliminary simulations using OTEQ to account for instream pH changes were unsuccessful due to the spatial nature of mixing processes, and insufficient information about the thermodynamic properties of precipitates forming in mixing zones.
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