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Item Condition assessment of tailings-impacted wetlands at the Carpenter-Snow Creek Mining District Superfund Site, Neihart, Montana(Montana State University - Bozeman, College of Agriculture, 2019) Sovner, Nicholas Steven; Chairperson, Graduate Committee: Scott PowellIn this study, I evaluate the condition of two wetlands down-gradient of mine tailings at the Carpenter-Snow Creek Mining District (CSCMD) Superfund Site near Neihart, Montana. Wetlands contaminated with mine waste are unique in that they are highly disturbed, but they still perform some level of ecological function and service. The CSCMD consists of 70 historic mine sites in the Upper Belt Creek watershed. Historic metal mining activity occurred between the late 1800s and early 1900s, with exploration activities occurring as late as the 1980s. Waste rock from mining and milling operations generated numerous tailings piles that expose heavy metals to erosion and subsequently contaminate groundwater, surface water, and stream sediments. Therefore, wetland rapid assessment tools were used to assess the capacity of wetlands to perform ecological functions. My objective was to identify which of four methods is the most effective at identifying functional loss. Rapid assessment methods included the U.S. Army Corps of Engineers - Hydrogeomorphic Approach to Assessing Wetland Function (HGM), the Montana Department of Transportation - Montana Wetland Assessment Method (MWAM), the Montana Natural Heritage Program - Montana Ecological Integrity Assessment (MEIA), and Montana Department of Environmental Quality - Wetland Assessment Protocol (WAP). The methods were performed on pairs of impacted and reference sites along Carpenter Creek and Belt Creek. My results indicate that MEIA displays the greatest sensitivity for differences between reference sites and impacted sites with a difference of 0.38 (out of 1) for the Belt Creek sites and 0.46 for the Carpenter Creek sites, while HGM displays slightly less sensitivity with differences of 0.31 and 0.40, respectively. The WAP shows the least absolute difference in index scores in the Belt Creek watershed (0.17), and the MWAM shows the least absolute difference between sites in the Carpenter Creek watershed (0.17). These results are useful for mining-related environmental cleanups where a decision regarding whether wetlands should be left in place, removed and reconstructed, or newly created where none currently exists. At cleanup sites, where long-term monitoring of wetland and riparian systems is necessary after reclamation, my study will help regulators and consultants determine whether a chosen remedial action was successful at eliminating, or at least significantly reducing, the effects of mine waste.Item An investigation of coliform contamination in private well water on the Crow Reservation(Montana State University - Bozeman, College of Agriculture, 2019) Three Irons, Emery UP; Chairperson, Graduate Committee: Scott Powell; Margaret Eggers (co-chair)The Crow reservation has a rural population that depends on home well water for domestic use. Many of the home wells do not have a suitable well cap, allowing a potential pathway of bacterial contamination of groundwater. Fecal coliform is associated with acute health problems, such as gastrointestinal illness, diarrhea, and cramps. Therefore, total coliform contamination of well water is an important health concern among Crow home well users. This research examines patterns in total coliform contamination among home well samples with respect to a suite of well and local aquifer characteristics thought to influence vulnerability to contamination, including well protection factors. Well and aquifer characteristics considered in this research include: the geologic production formation, local land cover, and distance to the nearest river. Well protection factors include: cap type, cap condition, depth of completion and time since completion (or age). One hundred water quality samples were collected from home wells along the Little Big Horn River in 2017, and available data on the character of those wells and aquifers were collected for comparison with the patterns in fecal coliform contamination among the samples. Presence/absence of coliform contamination was assessed using the Colilert IDEXX Quanti-Tray 2000 method. Spatial variations in the characteristics of wells and aquifers were characterized through a combination of well logs, the National Land Cover Dataset, and the National Hydrography Dataset. Logistic regression was used to identify potential relationships between probability of coliform contamination and characteristics of associated wells and aquifers. Logistic regression models suggested two notable and statistically significant (? = 0.05 level) relationships: (1) wells completed in alluvium and farther from the river had a higher probability of total coliform contamination, and (2) wells with old style caps had a higher probability of total coliform contamination. The government of the Crow tribe can decide how to use the results for mitigation efforts and awareness for homeowners with contaminated wells. Also, the Crow Water Quality Project should archive and consider these results for future research, planning, development, and management.Item Phosphorus, sediment, and water interactions in the Gallatin River of southwestern Montana(Montana State University - Bozeman, College of Agriculture, 1974) Adamsen, Floyd JamesItem Residual cyanide distribution in a neutralized gold leach heap(Montana State University - Bozeman, College of Agriculture, 1994) Poell, James G.Item A source study of the suspended solids in the Gallatin River(Montana State University - Bozeman, College of Agriculture, 1972) Hsieh, Yuch-PingItem Metal accumulation in voles from an acid mine drainage impacted wetland(Montana State University - Bozeman, College of Agriculture, 1990) Zavitz, Thomas LindseyItem Soil and terrain attributes for evaluation of leaching in a Montana farm field(Montana State University - Bozeman, College of Agriculture, 1995) Landon, Melissa AnnItem Mineralization of nitrogen and carbon in adjacent crop-fallow and native range soils(Montana State University - Bozeman, College of Agriculture, 1995) Neill, Karnes EdwinItem Remediation of acid rock drainage through the use of a constructed passive treatment system which simulates natural processes(Montana State University - Bozeman, College of Agriculture, 1997) Schmidt, T.G.Item Use of vegetative filter strip for controlling nitrate and bacteria pollution from livestock confinement areas(Montana State University - Bozeman, College of Agriculture, 2000) Fajardo, Juan Jose