Browsing by Subject "Pollution"

Now showing 1 - 20 of 20

Activities of the Grand Portage Reservation (Minnesota) to Protect and Restore the Aquatic Habitat in Lake Superior
(2006) Frazier, Brad; Watkins, Margaret; Nelson, Ryan
This is a 30-slide Powerpoint presentation summarizing the Grand Portage natural resources, wetlands, air quality, energy, solid waste and water quality program details; the cooperative agreement between the Grand Portage tribal authority and Minnesota Pollution Control Agency; the no discharge zone; and nonpoint source pollution efforts. Also briefly summarizes activities of the 1854 Treaty Authority.
Bench Scale Tests to Separate Mercury from Wet‐Scrubber Solids from Taconite Plants
(University of Minnesota Duluth, 2007) Benner, Blair R
Conservation Design Toolkit for LakeSuperiorStreams.org Stormwater Pollution Prevention Pilot Project
(University of Minnesota Duluth, 2006) Axler, Richard P; Schomberg, Jesse; Will, Norman; Reed, Jane; Lonsdale, David; Granley, Mindy; Hagley, Cynthia
Duluth, Minnesota has 43 named streams, 12 trout streams, and borders both pristine Lake Superior and the Duluth-Superior-Harbor Area of Concern. Duluth's storm water infrastructure includes 93 miles of streams and wetlands, and urbanization and rural development impact these waters by increasing runoff and velocity, temperature, turbidity and sediment, road salt, organic matter and nutrients. In 2002, an EPA (Environmental Monitoring for Public Access & Community Tracking) grant established a Partnership called DuluthStreams between the City of Duluth, University of MinnesotaDuluth professionals at the Natural Resources Research Institute and Sea Grant Program, and the Minnesota Pollution Control Agency and Western Lake Superior Sanitary District. Their goal was to enhance public understanding of streams and their connections to watershed land use by using real-time data and interpretive materials to illustrate the nature and consequences of degraded stormwater and its real costs to society. This has included issues associated with too much runoff such as flooding, with a key issue in the region being sanitary sewer overflows from infiltration and inflow (I&I). These events have imposed risks to public health and environmental risks to the coastal zone of Lake Superior and the Duluth-Superior Harbor, and required costly programs to reduce stormwater flows from key neighborhoods and construct storage tanks for temporary storage of stormwater enhanced sanitary sewer flows. The consequences of excess water and peak flows have also included excess sediment and turbidity, and potentially excess nutrients and pathogens. High salt concentrations for significant periods in late winter and early spring runoff from winter road and parking lot de-icing can present additional stress to trout and their prey. Increasing impervious surface and direct and indirect removal of riparian vegetation increases peak temperatures, especially during base flow periods creating additional periods of stress to cold water species with the additional potential stress of lowered dissolved oxygen. In 2003, sixteen governments and groups in the North Shore Region joined to form the Regional Stormwater Protection Team (RSPT). The Team's mission is to protect and enhance the region's shared water resources through stormwater pollution prevention by providing coordinated educational programs and technical assistance. One of the vehicles that the RSPT has harnessed for its stormwater education campaign is the DuluthStreams website as part of a regional effort to provide water pollution information to the public. The project has now expanded to now include 22 communities, agencies and organizations. In 2005 the website was re-named lakesuperiorstreams.org to reflect the broader geographic region that it represents in terms of climate, soils, quality of life, natural resources, the Lake Superior watershed, and culture. The website now averages more than 300,000 "hits"/month and >75,000 "page requests"/mo with a national target audience that includes: the general public; students and teachers; contractors, consultants and developers; decision makers; and agencies (local, state, and federal). Additional information is best found by examining http://lakesuperiorstreams.org.
DuluthStreams heads north: Making North Shore stream data make sense to citizens and local officials
(University of Minnesota Duluth, 2007-09-25) Axler, Richard P; Will, Norman; Host, George E; Henneck, Jerald; Lonsdale, David; Sjerven, Gerald; Reed, Jane; Ruzycki, Elaine; Hagley, Cynthia; Schomberg, Jesse; Carlson, Todd; Lonsdale, Marnie
The Duluth Streams website initially focused primarily within City of Duluth boundaries, but some of the streams that intersect Duluth originate in the surrounding communities of Hermantown and Proctor. In addition, Duluth and Superior share the St. Louis River watershed. The current project enabled us to fully expand the DuluthStreams website into a regional entity. It was built on a previous, but limited, Lake Superior Coastal Program Enhancement Fund effort to Minnesota Sea Grant at the University of Minnesota and partners that created web links to Proctor, Hermantown and Superior on the DuluthStreams website. This made these communities ideal as the first candidates for a regional expansion. As the project continued to evolve it became clear from discussions within the RSPT and with state agencies that there was a need to expand the focus area of the website to include the “greater Western Lake Superior” region and more specifically the Minnesota North Shore and Wisconsin South Shore in order to better manage Superior Basin water resources by supporting the mission of the RSPT regarding developing regional technical cooperation and collaboration, common educational materials, and presentation of case studies of successful stormwater designs. Minnesota streams draining into the Lake Superior coastal zone and St. Louis River Estuary are typically sensitive, low productivity, high-quality trout streams. Some (Miller, Amity, Lester, Talmadge, French, Poplar, Brule) are currently listed on the MN Clean Water Act (303d) List of Impaired Waters - most commonly for turbidity and Fish-Hg (MPCA 2006). Steep topography and thin, erodible soils make these streams particularly sensitive to development. Effective management and remediation of these streams requires an understanding of their physical, chemical, and biological characteristics, which can only be obtained by monitoring, particularly during storm and snowmelt runoff events, when the most dramatic impacts occur. These data are critical for developing and assessing BMPs, particularly in the face of increased development in the high growth watersheds along the North Shore of Lake Superior (e.g. Anderson et al. 2003; MPCA 2000; IJC 1999). MPCA initiated long-term monitoring of 6 critical streams along the North Shore in 2002. However, MPCA has lacked the resources to install automated water quality sensors, which are needed to capture critical pollutant loading events during high flows - important for developing cost-effective remediation and mitigation strategies.
DuluthStreams.org: Community Partnerships for Understanding Urban Stormwater and Water Quality Issues at the Head of the Great Lakes
(University of Minnesota Duluth, 2004-12) Axler, Richard P; Lonsdale, Marion; Reed, Jane; Hagley, Cynthia; Schomberg, Jesse; Henneck, Jerald; Host, George E; Will, Norman; Ruzycki, Elaine; Sjerven, Gerald; Richards, Carl; Munson, Bruce
This final report summarizes the accomplishments of the Duluth Streams Partnership from its inception through an EPA Environmental Monitoring for Public Access and Community Tracking (EMPACT) Program grant in January 2002 through September 2004. Duluth, Minnesota lies at the westernmost end of Lake Superior, the source and headwaters of the entire Laurentian Great Lakes ecosystem. Although perhaps better known for its extremely cold winters, Duluth residents and visitors know it as a city of forested hills, wetlands and trout streams with 42 named creeks and streams moving through the City in 30 subwatersheds. Duluth's park system is one of the most extensive in the nation, and the City owns and maintains 11,000 acres, including 125 municipal parks. Streams form the fabric of the aesthetic appeal and character of Duluth (Duluth Vision 2000), but are also the core of the City’s stormwater runoff system, with 250 miles of storm sewer, 93 miles of creek, 4,716 manholes, 2 lift stations, 13 sediment boxes, and over 138 miles of roadway ditches. Urbanization and rural development have placed increased pressure on the region’s coastal communities and on Duluth’s urban streams, in particular, on the 12 (with 2 more pending) that are designated as Trout Streams and 14 that are classified as Protected Waters. In addition, since the early 1990s, over 50 new lodging establishments were constructed along Lake Superior’s North Shore. One county located along the North Shore of Lake Superior (Cook) experienced a 24% population increase during that time. Stream communities of fish and amphibians and the invertebrates that sustain them are being adversely impacted by increased temperature, excessive turbidity and suspended solids, road salts, organic matter, and nutrients. Some of these streams have been placed on the Minnesota List of Impaired Waters, and several have been targeted for Total Maximum Daily Load (TMDL) development. Further, all of these streams discharge either directly into ultra-oligotrophic Lake Superior or indirectly via the St. Louis River Estuary- Duluth Superior Harbor. This is particularly important because Lake Superior has been designated as a zero-discharge demonstration project by the International Joint Commission for eliminating inputs of persistent toxic chemicals to the Great Lakes system. Second, the lake’s nearshore zone, the source of much of its biological productivity, is extremely nutrient deficient and sensitive to increased inputs of nutrients, suspended solids, turbidity, and organic matter. Lastly, the Harbor itself is one of the 43 Great Lakes Areas of Concern (AOCs) because of serious impairments to its beneficial uses. There are also significant social and economic impacts associated with this region - the Minnesota DNR reports that angling in North Shore streams and Lake Superior produces $63 million in direct sales and income and over 1,200 jobs. For North Shore streams alone, the numbers are over $33 million direct sales and income, and over 435 jobs. Stormwater issues have become increasingly important to resource and regulatory agencies and to the general public. In 1998 the City of Duluth established a stormwater utility to address the quality and quantity of surface water moving through the City and in 2003 was issued a Stormwater Permit under Phase II of the federal Clean Water Act’s National Pollution Discharge Elimination System (NPDES). Beginning in January 2002, under funding through EPA EMPACT in combination with in-kind effort from various agencies, the Natural Resources Research Institute (NRRI) and Minnesota Sea Grant formed a partnership with the City of Duluth, the Minnesota Pollution Control Agency (MPCA), the Great Lakes Aquarium, and the Western Lake Superior Sanitary District (WLSSD) to create Duluth Streams. Additional partners have since joined together to form a Regional Stormwater Protection Team (RSPT). The Partnership's chief goal is to enhance the general public's understanding of aquatic ecosystems and their connections to watershed land use to provide both economic and environmental sustainability. The project’s majors objectives were to: 1) link real-time remote sensing of water quality in four urban streams and GIS technology to current and historical water quality and biological databases (all 42 Duluth streams) using advanced data visualization tools in World Wide Web and information kiosk formats; 2) incorporate visually engaging interpretive text, animations and videos into the Duluth Streams website to illustrate the nature and consequences of degraded stormwater and the real costs to society; and 3) engage the public in the stormwater issue via programmatic activities such as establishing high school directed neighborhood stewardship and/or monitoring of 3 streams, developing curricula for high school and college students for inclusion in our Water on the Web curriculum, hosting a Duluth Streams Congress as a community forum for presenting all project results, and adapting the Nonpoint Education for Municipal Officials (NEMO) program to the greater Duluth Metropolitan Area. This final report summarizes the accomplishments of the Duluth Streams Partnership from its inception in January 2002 through September 2004. The website at htttp://duluthstreams.org is the focus of the project and offers water quality, biological, and GIS data in the context of a variety of school- and community-oriented educational material.
Essays on structural transformation in international economics
(2009-07) Stefanski, Radoslaw L.
This thesis investigates the impact of structural transformation in large, newly industrializing countries on the international price of oil and on carbon emissions. The first essay measures the impact of industrialization in China and India on the oil price in the OECD. I identify an inverted-U shaped relationship in the data between aggregate oil intensity and the extent of structural transformation. I construct and calibrate a multi-sector, multi-country, general equilibrium growth model that accounts for this fact and use it to show that structural transformation in China and India explains up to a quarter of the oil price increase in the OECD between 1970 and 2007. Continued structural transformation however, results in a falling oil price. A standard one-sector growth model misses this non-linearity. To understand the impact of growth on the oil price, it is necessary to take a more disaggregated view than is standard in macroeconomics. The second essay empirically analyzes the source of the Environmental Kuznets Curve (EKC) - an inverted-U shaped relationship between emissions and income per capita. Recent theory claims that the EKC relationship is driven by falling growth rates associated with convergence to a balanced growth path. A decomposition of emissions however, shows that falling emission intensity growth rates dominate growth effects by an order of magnitude. Structural transformation is one mechanism capable of generating the observed patterns in emission intensity growth rates. The third essay investigates the extent to which a country's structural transformation influences its emission profile. I document how CO2 emission intensity follows an inverted-U with income, despite falling energy intensities. This pattern is driven by changing fuel mix and improvements in energy efficiency associated with structural transformation. I construct and calibrate a two-sector, general equilibrium model that accounts for the emission, emission intensity and energy intensity profiles of the UK for 150 years. I show that a one sector framework is incapable of matching both a hump-shape emission and a falling energy intensity; that timing of structural transformation matters for emission profiles and that improvements in energy efficiency may be insufficient to explain observed falling emissions in rich countries.
Field Guide for Maintaining Rural Roadside Ditches
(2014) Brady, Valerie; Axler, Richard P.; Schomberg, Jesse
Harrison Neighborhood Environmental Assessment.
(2003) Minneapolis Neighborhood Information System
Human Influences on Water Quality in Great Lakes Coastal Wetlands
(2008) Morrice, John A; Danz, Nick; Regal, Ronald R; Kelly, John R; Niemi, Gerald J; Reavie, Euan; Hollenhorst, Thomas; Axler, Richard P; Trebitz, Annet; Cotter, Anne C; Peterson, Gregory S
This peer-reviewed article discusses water quality and chemistry issues with anthropogenic causes. Geographically, it covers the US coastal region of the Great Lakes. A map in the article suggests that only one sampling point was within Minnesota’s coastal region. The article focuses on water chemistry in coastal wetlands across the Great Lakes, but not specifically for Minnesota. Key points in the abstract are extracted and reproduced below. A better understanding of relationships between human activities and water chemistry is needed to identify and manage sources of anthropogenic stress in Great Lakes coastal wetlands. The objective of the study described in this article was to characterize relationships between water chemistry and multiple classes of human activity (agriculture, population and development, point source pollution, and atmospheric deposition). We also evaluated the influence of geomorphology and biogeographic factors on stressor-water quality relationships. We collected water chemistry data from 98 coastal wetlands distributed along the United States shoreline of the Laurentian Great Lakes and GIS-based stressor data from the associated drainage basin to examine stressor-water quality relationships. The sampling captured broad ranges (1.5–2 orders of magnitude) in total phosphorus (TP), total nitrogen (TN), dissolved inorganic nitrogen (DIN), total suspended solids (TSS), chlorophyll a (Chl a), and chloride; concentrations were strongly correlated with stressor metrics. Hierarchical partitioning and all-subsets regression analyses were used to evaluate the independent influence of different stressor classes on water quality and to identify best predictive models. Results showed that all categories of stress influenced water quality and that the relative influence of different classes of disturbance varied among water quality parameters. Chloride exhibited the strongest relationships with stressors followed in order by TN, Chl a, TP, TSS, and DIN. In general, coarse scale classification of wetlands by morphology (three wetland classes: riverine, protected, open coastal) and biogeography (two eco-provinces: Eastern Broadleaf Forest [EBF] and Laurentian Mixed Forest [LMF]) did not improve predictive models. This study provides strong evidence of the link between water chemistry and human stress in Great Lakes coastal wetlands and can be used to inform management efforts to improve water quality in Great Lakes coastal ecosystems.
Mercury Release from Taconite During Heating
(University of Minnesota Duluth, 2005) Benner, Blair R
The taconite industry is under pressure to reduce the emissions of mercury from their induration process. Previous studies have indicated that greater than 90 percent of the mercury in the green balls being fed to the induration process is vaporized during the induration. The Minnesota DNR is in the process of conducting a bench-scale study to determine the rate of mercury release as a function of temperature during the heating of taconite. This program is a supplement to that work. The objectives of this program were to determine the role of oxidation in the release of mercury at various temperatures and to provide samples of heated material for Mossbauer spectroscopic analysis.
Microplastics in the surface water and sediments of western Lake Superior as determined via microscopy, Pyr-GC/MS, and FTIR.
(2017-09) Hendrickson, Erik
While the presence of plastic pollution is well known in the world’s oceans and is beginning to be documented in the world’s freshwater systems, there is not yet an in-depth understanding of the distributions, chemical compositions, fates and ecological impacts of plastic particles in most aquatic systems. Microplastic particles are of particular concern due to their direct biological effects (such as false satiation), their roles as sorbents of other chemical compounds, and as vectors for invasive species. In this study, we evaluate the magnitude, distribution, and common polymers of microplastic pollution in surface waters and sediments in western Lake Superior, the deepest and most pristine of the Laurentian Great Lakes. Microscopy, Pyrolysis-Gas Chromatography/Mass spectrometry (Pyr-GC/MS), and Fourier Transform Infrared spectroscopy (FTIR) were used to quantify and identify microplastic particles. Despite the low human population density in Lake Superior’s watershed, microplastic particles (particularly fibers, fragments, and films) were identified in western-lake surface waters at levels significantly greater than those previously reported in Lake Superior’s eastern basin (p-value < 0.05). Microplastic concentrations in western-lake surface waters were found to range from 0 to 110,000 particles•km-2 (n=15, mean: 39,000 particles•km-2, standard deviation: 28,000 particles•km-2, and 95% confidence interval: ±14,000 particles•km-2). Fibers were the most frequently observed morphology in lake surface waters and sediments. The most common polymer in surface waters and sediments was PVC; for surface waters, PP and PE were the next most frequently observed, and PET was the only other polymer observed in sediments. Our ability to evaluate microplastic abundances in Lake Superior’s waters and sediments was in part determined by the need to correct for ambient contamination from atmospheric deposition of microplastics during sampling and sample processing. The effects of this contamination, coupled with the small sample area of sediment obtainable by multi-corer, made determining microplastic concentrations in surface sediments problematic. Results presented here provide quantitative and qualitative data on microplastic pollution in western Lake Superior using improved analytical methodology, including polymer characterization by two different techniques. This study also provides insights into possible sources of microplastic pollution in Lake Superior, and ways to improve future microplastics studies in aquatic systems.
The Minnesota Regional Copper-Nickel Study 1976-1979, Volume 1: Executive Summary
(1979) Minnesota Environmental Quality Board
This is a comprehensive, clearly-written document summarizing potential biophysical and socioeconomic impacts of copper-nickel mining in Minnesota. Special attention is paid to impacts on water resources. Relevant sections are reproduced in their entirely below, not only for historical interest but because of predictive power. Summary: "The Minnesota Environmental Quality Board's Regional Copper-Nickel Study is a comprehensive technical examination of the environmental, social, and economic impacts associated with the potential development of copper-nickel sulfide mineral resources of the Duluth Complex in northeastern Minnesota. This executive summary of the 5 volume, 36 chapter report presents some of the major findings of the Study, but in order to get a complete picture of the complex issues associated with exploiting this valuable mineral resource, the entire document should be examined. In addition to this report over 180 technical reports, extensive environmental monitoring data files, special sample collections, and other information resources were compiled by the Study" (n.b. these documents were not reviewed as part of this current desk review). Consistent with directions from the Minnesota Legislature, the Regional Copper-Nickel Study presents technical findings but does not make policy recommendations based on these findings." "To allow for a discussion of the potential environmental and socio-economic effects of copper-nickel development, an area of approximately 2100 square miles was designated as the Regional Copper-Nickel Study Area (or simply, the Study Area). This area contains Virginia in the southwest corner and Ely in the northeast corner. The major copper-nickel deposits of interest occur along the Duluth Gabbro Contact, in a band three miles wide and fifty miles long (the Resource Area); however, additional deposits may extend beyond this band. The Water Quality Research Area, which includes the complete watersheds of 14 streams of interest, is shown in Figure 2. Waters north of the Laurentian Divide are part of the Rainey River Watershed, which includes a portion of the Boundary Waters Canoe Area, and whose waters eventually drain into Hudson Bay and the North Atlantic. Waters south of the Divide are a part of the St. Louis River Watershed which drains into Lake Superior and eventually into the Atlantic Ocean via the St. Lawrence River.” "Historically, the exploitation of base metal sulfide resources (such as copper-nickel resources) throughout the world has been accompanied by the significant degradation of the quality of water resources and the destruction of aquatic and terrestrial biota m the vicinity of such developments. Acid mine drainage, toxic heavy metals contamination, erosion, sedimentation, increased salinity, and other water pollution problems associated with mining were common. The nonferrous minerals smelting industry (principally copper, lead, and zinc) has also been a major source of manmade air pollutants. Until new technology has been developed to minimize many of these impacts, adverse impacts of past practices continue to cause close scrutiny of new mining proposals.” Water Quantity (Volume 3-Chapter 4). "Surface water is abundant in the Water Research Study Area due to high surface runoff. Average annual runoff in the region is about 10 inches. The Water Research Study Area includes 360 lakes larger than 10 acres, in addition to 14 small rivers and streams. Nearly 75 percent of the Water Research Study Area, and an even larger proportion of the surface water is north of the Laurentian Divide. North of the Divide, lakes are more numerous and larger, and the volume of stream flow is greater because a larger area is being drained. Because some of these waters are inside the BWCA, not all of the water north of the Divide is directly available for use. Annual average flow for 12 streams studied by the U.S. Geological Survey for the Study ranged from 23 to 1,027 cubic feet per second (cfs). High flow generally occurs after heavy precipitation and following the spring snowmelt. Average low flow for seven days is 2 to 186 cfs compared to an average high flow of 87 to 4,763 cfs. Ground water yield is generally low, limited by the low permeability of the Area's bedrock and the often shallow overlaying glacial deposits. Yields generally average less than 5 gallons/minute. Three relatively small areas have high volume aquifers yielding up to 1,000 gallons/minute: the Embarrass Sand Plain, the Dunka River Sand Plain, and the local fractured and leached bedrock areas in the Biwabik Iron Formation.” "Current industrial use of surface water is primarily for electric power generation. Mine-pit dewatering is the greatest groundwater use. At current levels, water use does not cause significant impacts on the region's water resources, although withdrawal from some streams must be reduced during low flow. Surface water, including some of the large on-channel lakes (e.g. Birch Lake), could supply large water users, al though storage may be required for certain streams. The Embarrass River Valley aquifer is the only identified groundwater source in surficial materials that could supply large water users.” Water Quality (Volume 3-Chapter 4). "Because of the large number of streams and lakes in the Study Area, the value of high quality water which supports a significant recreational and wilderness resource of the state and the nation, and the recognized historic relationship between base-metal mining and water pollution, a major responsibility of the Regional Copper-Nickel Study was the collection of baseline surface and ground water quality data (note: data tables and figures and not reproduced). "The quality of the region's water resources is generally very good except for several streams with watersheds affected by extensive taconite mining activities, and for groundwater either from glacial till or wells near the Duluth Gabbro Complex sulfide mineralization. Streams draining largely undisturbed watersheds can be described as containing soft water, having low alkalinity, low total dissolved solids, low nutrients, high color, very low trace metals concentrations, and low fecal coliform counts.” "Streams draining disturbed watersheds (Partridge, Embarrass, Upper St. Louis rivers south of the Laurentian Divide, and the lower Dunka River and Unnamed Creek north of the Divide) would be considered to contain moderately hard to hard waters, with elevated dissolved solids, nutrients, and trace metals concentrations relative to undisturbed watersheds. Color and fecal coliform concentrations are not significantly different in the two watershed classifications. Most water quality parameters tend to be much less variable in undisturbed streams as compared to disturbed streams. The quality of the lakes studied is variable though similar to the quality of undisturbed streams. However, lake values may be less meaningful for determining baseline concentrations than values in streams because of the limited number of samples.” "In general, concentrations of most chemical constituents are higher in the groundwater than in streams and lakes of the area. Groundwater from wells proximate to the Duluth Gabbro contact were found to have higher levels of trace metals and sulfate than wells located at a distance from the contact. Phosphorus and nitrogen are the major nutrients in aquatic systems. Concentrations of both nutrients in study streams are at the low end of the range of values for U.S. streams. Variations in nutrient levels exhibited no clear trends between headwater and downstream stations or between small and large watersheds. Highest concentrations of nitrogen were found downstream from mining operations where blasting compounds containing nitrogen are used. In lakes, nutrient parameters are closely associated with the activities of aquatic organisms. Higher levels of available nutrients encourage greater biological productivity. The ratio of nitrogen (N) to phosphorus (p) can be used to evaluate which of these nutrients limits algal productivity. Lakes with a N:P ratio greater than 14 are considered to be limited by phosphorus. Within the Study Area, median N:P ratios ranged from 14 to 60, and half the lakes studied had ratios greater than 25. Overall concentrations of both nutrients were at the low end. Median values for both nutrients were higher south of the Laurentian Divide than north of it. The most productive lakes were all headwater lakes, usually shallow, and surrounded by extensive bog and marsh areas.” "A major concern related to copper-nickel development is levels of heavy metals in surface waters. At background stream stations, copper, nickel, and zinc levels are generally very low, with median concentrations of copper and zinc in the range of 1-2 ug/liter and nickel around 1 ug/liter. Other trace metals of biological importance (As, Cd, Co, Hg, and Pb) have median concentrations significantly below 1 ug/liter. There is little variability in the levels of arsenic, cobalt, cadmium, mercury, titanium, selenium, and silver across almost all surface waters monitored. As expected, iron, manganese, copper, nickel, zinc, lead, fluoride, and chromium concentrations in streams are significantly higher in disturbed watersheds than in undisturbed areas. The dynamics of metals in lakes are somewhat different from those in streams because the large surface area of bottom sediments with their varying oxidation reduction potentials complicates the picture. Lakes can act as sinks for metals (as is the case with iron at Colby Lake) so that the chemistry of out flowing waters is different from that of inflowing waters. Large lakes may exhibit variability in the concentration of metals within the lake itself (as is the case with nickel in Birch Lake). Similar to streams, iron,' aluminum, and manganese were the most elevated metals in the Study Area lakes. Copper, nickel, and zinc have median levels between 1 and 2 ug/l, whereas arsenic, cobalt, and lead have median levels of 0.6,0.4, and 0.4 ug/l, respectively. Cadmium levels were an order of magnitude (10 times) lower than those for arsenic, cobalt, and lead. The greatest variabilities in concentrations were exhibited by manganese, zinc, cadmium, and aluminum, with arsenic the least variable metal.” "Water quality standards and criteria for many parameters have been adopted or are proposed for adoption by the Minnesota Pollution Control Agency or the U.S. Environmental Protection Agency (EPA). Recommended levels for cadmium, color, copper, iron, lead, manganese, mercury, nickel, nitrogen (as N02 + N03), pH, specific conductance, sulfate, and zinc were exceeded in one or more of the streams monitored. In most cases, these elevated levels occurred in Unnamed Creek, which is affected by mining (see discussion of Unnamed Creek below). The region's streams and lakes have naturally high color levels.” "All streams which were monitored exceeded the EPA water quality criteria for mercury (0.05 ug/liter). The median concentration of mercury for all streams monitored was 0.08 ug/liter with a range of 0.01-0.6 ug/liter. Standards for mercury are based on U.S. Food and Drug Administration guidelines for edible fish. High mercury levels have been found in fish from some of the area's lakes and streams. Because acid precipitation is a potential problem, the quality of precipitation in the Study Area was monitored at several sites. Seventy-seven percent of the samples (41) had a pH less than 5.7, which means that most of the precipitation measured can be considered acidic. Fifty percent of the samples had a pH of 3.6 to 4.4. The geometric mean pH of samples collected in the area was 4.6. These values are comparable to, or even less than values measured in areas of the world where ecological damage has already occurred. Measurements by the Regional Study indicate that the present annual sulfate deposition rate (wet plus dry) across the Study Area is from 10 to 20 kg/ha/yr (9 to 18 lbs/ acre/yr). Atmospheric dispersion modeling indicates that regional sources of S02 are not major contributors to depressed acidity of precipitation and suIfate deposition in the region. This in turn indicates that out-state and out-of-state sources, possibly as far away as St. Louis, Chicago, and Ohio Valley areas, are likely the major cause of acid rain and sulfate deposition in northeastern Minnesota.” "If the patterns of increasingly acidic precipitation continue, it is likely that many of the poorly buffered small streams will have noticeable decreases in aquatic populations (such as fish) during and following spring melt.” "Stream systems are very sensitive because the flush of water from spring snowmelt can represent a majority of the water that the stream may carry through the whole year. Recovery from these episodes may be expected to be fairly rapid (i.e. within months) unless or until the sources of recolonizing organisms are themselves affected (i.e. well buffered lakes or large unaffected streams). Recovery would be very slow once the source areas are affected. The effects of acid precipitation on vegetation range from damage to leaves to increased susceptibility to disease and death (see Volume 4-Chapter 2). A direct causal relationship between acid precipitat ion and reduced forest productivity measured by growth remains to be demonstrated. However, research suggests that acid precipitation is probably a cause of reduced forest growth. Because acidic precipitation and sulfate deposition are primarily related to air pollution sources outside the region and are projected to increase significantly over the next 10-20 years, acidification may represent a serious threat to the ecosystems of northeastern Minnesota, even if copper-nickel development does not occur. Long-term changes in the aquatic communities are probably already underway due to the general decrease in the pH of precipitation and thereby of surface waters in the Study Area. Because the decrease in pH will likely be slow, measurement of biological effects would require intensive long-term monitoring. During this period of decreasing pH, the overall productivity and diversity of the aquatic communities can be expected to decrease.” "One crucial parameter that was monitored is the water's buffering capacity-- its ability to regulate pH changes due to acid inputs from atmospheric deposition or leaching. The resistance to pH change is a function of the type of acid input (i.e. strong or weak acids) and the type of chemical components in the receiving water which can assimilate or bind the hydrogen ions. Calcite saturation indices (csr) were calculated for all study lakes and 30 lakes in the BWCA to measure this buffering capacity. Lakes with a csr less than 3.0 are well buffered; lakes with an index between 3.0 and 5.0 are poorly buffered with the possibility that acidification may already be occurring; and an index over 5.0 indicates lakes with little or no buffering ability and a strong possibility that severe acidification has already occurred.” "The poorly buffered lakes in the region are with few exceptions headwater lakes. This may be explained by the fact that buffering is a function not only of atmospheric processes, but also of watershed geology. The chemistry of headwater lakes often reflects that of precipitation, with watershed contributions to lake chemistry assuming secondary importance. As one proceeds from headwater to downstream lakes 1.U the Study Area, the ability of the lakes to assimilate hydrogen ions generally increases. Headwater areas of the region (which include half the BWCA lakes studied) are generally not well buffered and have limited capacities to assimilate existing acid loadings. Some of the lakes sampled during the study which may be the earliest to be affected by acidic precipitation include: Clearwater, August, Turtle, One, Greenwood, Perch, and Long lakes. These lakes have Calcite Saturation Indices above 3.0. Headwater streams are generally poorly buffered, in part because their water quality is also dependent upon the quality of precipitation.” "Two unique water quality conditions have been identified in the Study Area which are directly related to the presence of copper-nickel sulfide mineralization. In one of these cases, human disturbance of this mineralization has accelerated the chemical/physical weathering (leaching) of this material. Filson Creek, located in the northeastern part of the Study Area adjacent to the BWCA, flows naturally over exposed mineralized gabbro. Within the Filson Creek watershed, total concentrations of copper and nickel 10 the year 1977 generally increased from headwater locations to Filson's point of discharge into the South Kawishiwi River. Total nickel concentrations measured in Filson's headwaters were, except for one sample, less than 1 ug/liter, while the mean nickel concentration near the mouth of the watershed was 3 to 5 ug/liter. The smaller copper and nickel concentrations at Filson Creek headwater locations reflect the smaller percentage of sulfide bearing material in the till and the greater distance from the mineralized contact zone. The elevated metal values measured in Filson Creek may not be completely due to natural weathering of sulfide minerals. Prior to 1977, considerable mineral exploration activities occurred, including the taking of a bulk surface mineral sample. Subsequently, a small volume surface discharge was discovered at the foot of the bulk sample site with elevated metals levels (10,000 to 13,000 ug/l Ni, 360 to 1,000 ug/l Cu, and 190 to 5300 ug/l 2n). This discharge enters a small tributary of Filson Creek and raises the nickel and copper concentrations by about 9 ug/l and 5 ug/l, respectively. This change in trace metal concentrations is not sufficient to result in measureable biological changes in the Creek.” "In the other unique case, a small watershed (Unnamed Creek) which drains into Birch Lake at Bob Bay contains several wastepiles containing mineralized gabbro from a nearby taconite mining operation (Erie Mining Company's Dunka Pit). The large surface area of the waste rock facilitates the chemical weathering process. Surface seeps containing elevated concentrations of sulfates and trace metals (especially nickel) are present. The seeps flow into Unnamed Creek where the influence of this disturbance on water quality is obvious. Median nickel levels in Unnamed Creek were 85 ug/l, compared to 1 ug/l in undisturbed streams (Table 4). Extensive field studies conducted in this watershed have demonstrated that extensive disturbance of the mineralized gabbro without corrective mitigation can result in significant water quality degradation. The magnitude of the potential impacts in this specific case is largely mitigated by natural chemical processes involving adsorption, chemical complexation, and precipitation due largely to the presence of a bog in the watershed. The metal concentrations measured at Bob Bay would be significantly higher if not for the effect of the bog. However, the bog is showing some signs of stress and its beneficial effect on water quality may not continue for long.” Environmental Impact Assessment: Water Use "Water is required in significant quantities as a transport medium for the ore during concentration and for tailing disposal. Additional water is required in the smelting and refining phase for cooling and other purposes. Precipitation partially offsets the major water losses coming from evaporation losses coming from evaporation from tailing basins and water trapped between particles in tailing basins. However, fresh makeup water (estimated to average 0.76-1 b ill ion gallons per year) will be required for all three integrated copper-nickel development models (Volume 2-Chapter 5). Water requirements will vary significantly on a seasonal and annual basis.” "A good water management system is designed to manage and store runoff and seepage on the site (around waste piles, tailing basins, and elsewhere). The specific site and the design of the system will determine whether periodic discharges of waste water will be necessary during periods of above average precipitation. Because of the fairly continuous demand for water and the varying supply of water in lakes and streams in the area, it is estimated that significant water storage (10,000 to 15,000 acre-feet) will be necessary for use during dry periods. This water storage could be supplied by the tailing basin and/or reservoirs. Storage requirements for makeup water supply and containment of polluted water could increase land requirements by 2,000 to 3,000 acres.” "Increased demand for water could become a source of conflict if waters tributary to the BWCA are appropriated for copper-nickel development and if the waters are also diverted for taconite development, such as the Upper St. Louis and Partridge river watersheds. These issues could be considered prior to issuance of a DNR permit which s required for water appropriation. However, if both taconite expansion and copper-nickel development proceed in northeastern Minnesota, a regional comprehensive water management plan and perhaps a cooperative industrial water supply system may need to be considered.” "Quality of tailing water during the operating phase 1S primarily controlled by the concentrating process water. This water is largely recycled and should not be a significant heavy metal pollution source. Seepage can also be collected and recycled if necessary. Elevated levels could occur during the post-operating phase or if more sulfides are deposited in the basin than projected. Local variation in ore mineralogy could result in pockets of tailing having much higher sulfide concentrations which could cause localized leaching problems. Due to limited research on tailing water quality, the unknowns involving the quality of runoff and seepage from a tailing basin are greater than those associated with waste rock piles and create another source of significant risk involving future copper-nickel water management decisions.” "Mine dewatering can also contribute heavy metals, the amount depending upon the quantity of water from precipitation and groundwater sources that must be removed and the metal sulfide content of the mine. No precise conclusions can be made about expected levels of heavy metal release from this source. Smelter and refinery waste water 1S not as significant an issue as waste piles. Production of these waste waters 1S dependent on facility design and operation, and there appears to be no significant post-operational concerns.” "Treatment methods are available to reduce heavy metal concentrations in these waste waters to levels where biological impacts are not expected. Effluent water quality models for impact assessment purposes were developed (Volume 3-Chapter 4) based on the best data available from field and laboratory results, but this information is not sufficient to allow precise statements on the quality of water produced from copper-nickel water pollution sources or on the effectiveness of reclamation practices for specific effluent parameters (e.g. suIfates, trace metaIs, processing reagents). For example, information strongly suggests that runoff from waste piles will contain elevated heavy metals and dissolved solids concentrations as compared to background surface water quality. Heavy metals could be 500 to several thousand times higher than natural water quality levels and sulfates could be ten to several hundred times higher.” "These models reflect an assumption that acid mine drainage problems will not occur because of the natural buffering capacity of the waste materials. If this assumption IS wrong and acid conditions do occur, then projections of water pollution will be significantly underestimated because, as the pH becomes acid, there are dramatic increases in the amount of heavy metals leached from the waste significantly affects whether a metal will be in an aqueous phase (and highly mobile) or in a solid phase.” "Treatment of large amounts of runoff to remove heavy metals to existing background levels may be prohibitively expensive. Additional research is necessary in order to make accurate predictions about effluent quality and the effectiveness of various controls. Cost and time constraints will likely require that the first mining activities proceed without this predictive capability.” Heavy metals have adverse effects on aquatic organisms, the extent depending upon the type of metal (or combination of metals), organism tolerance, and water chemistry (Volume 4-Chapter 1). For example, cold water fisheries are generally more susceptible to heavy metal pollution than warm water fisheries." No mention is made of impacts on wild rice stands.
Outdoor Recreation in the Regional Copper-Nickel Study Area
(1978) Webb, Sara
This 35-year old study primarily discusses non-Indian recreational use of public and private lands in the Cu-Ni region of Minnesota’s Iron Range. This recreation-oriented study does not specifically note Native American use of study area lands except for very indirect references to gill-netting and wild ricing. It has a strong focus on human use of water resources in the region, but does not investigate potential impacts of increased recreational use, mining, or other anthropogenic activities with potential to affect condition of these resources. The study abstract and key segments are extracted and reproduced below. Abstract: “Geographic patters of outdoor recreational use in the Copper-Nickel Study Area were investigated as part of a study of potential impacts of copper-nickel mining in Northeastern Minnesota. With the objective of characterizing patterns of recreational use of facilities, water bodies and public lands, interviews were held with thirteen land use managers and others familiar with the study area. Findings from this interview program together with past recreation research provide a data base on existing recreational use necessary for to impact analysis. Numerous public and private recreation facilities are located along Study Area lakes and streams. Outside facilities, public and some private lands are used for diverse land-based activities when afforded road, trail, or surrogate trail access; old logging roads serve this function in the most heavily-used areas, although some activities such as and winter camping rarely occur in recently logged zones. Dense settlement and lowland bogs restrict access by most land-oriented recreationists. Water-based recreation is concentrated on large, deep lakes in the Study Area's northern half. Part of the Boundary Waters Canoe Area (BWCA), a national wilderness area, lies within the Study Area's north boundary. Canoeists and fishermen use BWCA lakes heavily. Dozens of smaller lakes throughout the Study Area serve Iess diverse but sometimes more intensive recreation functions. Only a few lakes lack any recreational use; most are quite small and lack access or recreation resources. Most Study Area streams have limited recreational use because of low water levels, with the exception of two rivers, the Kawishiwi and the St. Louis River. Three general types of outdoor recreation can be distinguished: facility -based recreation), dispersed land-based recreation, and water-based recreation. To spare the time and expense of primary field surveys, a program of interviews with thirteen land managers such as conservation officers and foresters was designed, using Spradley's interview method. Key points: ‘Outdoor recreation in all forms is dependent upon access: roads, trails, and public lands. The region is covered with an extensive network of land management units at various levels. Land-based recreation use relates closely to the area's logging history and logging roads. Lake, stream, road and facility use must be carefully evaluated before siting decisions about mining and recreational use are finalized.’
Phytoremediation: Effects of Timing on the Overall Health of Brassica Juncea
(2014) Larson, Christopher E.
Preventing Pollution Problems from Lawn and Garden Fertilizers
(St. Paul, MN: University of Minnesota Extension Service, 2005) Rosen, C.J.; Horgan, B.P.
Regional Copper-Nickel Study : Plant Diseases Affecting Forest Trees in Northeastern Minnesota's Regional Copper-Nickel Study Area
(1978) Zeyen, Richard J; Groth, James V
This report presents a series of tables of tree diseases in the region, as well as factual narrative descriptions. The document contains a table of common plant diseases for the region. The remainder of the report describes a variety of tree diseases and their symptoms and appearance. No conclusions or recommendations are included. The abstract and summary points are extracted and reproduced below. "This report is based upon lists of major vegetation community types, compiled for a preliminary study of the Regional Copper-Nickel Study Area. Only dominant plant species, as determined by releve techniques, have been included in the discussion of diseases. The intent of this report is to present a brief survey of the major diseases caused primarily by biotic agents. The information was obtained from general references and from personal observations of the diseases of the area over the past 11 years. The report is divided into two parts: (1) a comprehensive table of diseases recorded in the area and their causal agents (Table 1), and (2) brief descriptions of 25 diseases of exceptional economic or aesthetic importance."
Responsible Mining in the Lake Superior Basin
(2013) Lake Superior Binational Program
The Lake Superior Binational Forum drafted a statement on responsible mining, with recommendations for future mining projects, which are summarized in this document. The statement aims at a “zero discharge” principle. The Forum held three public meetings to gather input for the statement. Key excerpts are reproduced below: “Responsible Mining Should: A. Meet or exceed the provisions of the Great Lakes Water Quality Agreement of 2012 between Canada and the United States in: 1. Adopting the goal of zero discharge and zero emission of persistent bioaccumulative toxic substances in the basin, thereby preventing further degradation of the ecosystem. 2. Anticipating and preventing pollution and other threats to water quality in the Great Lakes to reduce overall risks to the environment and human health. 3. Incorporating the precautionary approach, as set forth in the Rio Declaration on Environment and Development, that “Where there are threats of serious or irreversible damage, lack of full scientific certainty shall not be used as a reason for postponing cost-effective measures to prevent environmental degradation.” 4. Incorporating the “polluter pays” principle, as set forth in the Rio Declaration on Environment and Development, “that the polluter should bear the cost of pollution.” 5. Applying innovation – considering and applying advanced and environmentally-friendly ideas, methods and efforts to prevent environmental problems. 6. Considering social, economic and environmental factors, including assessment of full life cycle costs and benefits, and incorporating a multi-generational standard of care. B. Be clear and transparent with regulatory agencies, affected communities, and the public, while fostering cooperation with relevant agencies and the greater public. C. Carry out rigorous environmental assessment of all aspects and phases of the mining and milling process, including potential future expansion of mining activities. Public opinion and advice should be incorporated where possible, and the assessment process should explain why other public proposals were not incorporated into the final decision. D. Recognize that short-term mining operations can have long-term legacies, so approved plans should secure funding for staffing, monitoring, prevention, and repair of mining sites after closure. E. Contribute to the local, regional, and national economy through a fair wage, salary, and benefit structure, and in paying all taxes assessed by government agencies in each jurisdiction in which it operates F. Respect private and other land rights and where applicable compensate land owners for losses of value, and land users for losses of opportunity.” The document also contains nine recommendations for future mining operations, briefly summarized as follows: 1. Develop a common set of criteria for use by governments, NGOs and industry to guide the permitting process. Currently public agencies use different criteria in each state. 2. Avoid mining in places with high environmental or social/cultural value. 3. Improve public participation by stakeholders in the environmental assessment process through the collection of adequate baseline data; consideration of potential worst-case scenarios; and independent third-party review processes. 4. Water quality objectives that are consistent with the LAMP should be developed. 5. Overburden and tailings should be discharged into water bodies or wetlands; acid-generating materials should be segregated; and hazardous materials plans should be made public. 6. Companies should make atmospheric emission reports. Environmental assessments should consider greenhouse gas emissions from mining operations. 7. Companies should set aside financial resources for the exploration phase to cover clean-ups, reclamation and long-term monitoring. The public should have the right to comment on the adequacy of these resources and reclamation activities. 8. The public should have the right to access monitoring and periodic technical reports during the life of the mining operation; and to do independent third-party review of the process. 9. Companies should have a reclamation plan with resources set aside for each operation. Mined areas should be re-contoured and stabilized. 10. Citizen participation and oversight are important elements listed under “social impacts and decision making,” including the engagement of Tribal Nations, First Nations and Metis. 11. Research is needed on the cumulative and indirect effects of mining; climate change and mining impacts; and human health research, including impacts on people, fish and wild rice.
Statistical Analysis of the Soil Chemical Survey Data
(Minnesota Department of Transportation Research Services Section, 2010-06) Dhar, Sauptik; Cherkassky, Vladimir
This report describes data-analytic modeling of the Minnesota soil chemical data produced by the 2001 metro soil survey and by the 2003 state-wide survey. The chemical composition of the soil is characterized by the concentration of many metal and non-metal constituents, resulting in high-dimensional data. This high dimensionality and possible unknown (nonlinear) correlations in the data make it difficult to analyze and interpret using standard statistical techniques. This project applies a machine learning technique, called Self Organizing Map (SOM), to present the high-dimensional soil data in a 2D format suitable for human understanding and interpretation. This SOM representation enables analysis of the soil chemical concentration trends within the metro area and in the state of Minnesota. These trends are important for various Minnesota regulatory agencies concerned with the concentration of polluting chemical elements due to both (a) human activities, i.e., different industrial land usage, and (b) natural geological factors, such as the geomorphic codes and provenance of glacial sediments.
Transport of Perfluorochemicals to Surface and Subsurface Soils
(Center for Transportation Studies, University of Minnesota, 2013-03) Xiao, Feng; Gulliver, John S.; Simcik, Matt
Perfluorooctane sulfonate (PFOS) and perfluorooctanoate (PFOA), as persistent organic pollutants, are ubiquitously present in the environment, and have been detected in human blood and breast milk at concentrations of concern to health and environmental regulators. This project aims to identify the PFOS/PFOA contamination sources, contaminant release mechanisms, and migration pathways from contaminated soils. Soil samples at different depths along and perpendicular to a U.S. highway were collected, and both compounds were regularly quantified in all of our surface soils samples (0.2–125.7 ng/g dry soil weight). The results of the surveying and sampling program and subsequently geo-statistical modeling with the aid of a Geographic Information System (GIS) identified two hot spots, and supported wind as the primary transport carrier causing the mitigation of contaminated soils from the hot spots to off-site soils. The observations indicate that PFOS and PFOA contamination is not contained to a few hot spots, but is migrating with wind and traffic to other locations. This proposed soil-to-soil migration pathway appears to be an important and heretofore overlooked migration mechanism of PFOS and PFOA from contaminated spots. We also studied their occurrence and fate in subsurface soil samples, and found a general increase in concentrations with the depth at which soil samples were collected, indicating that the contamination is also migrating toward the groundwater table.
Water quality trading on the Minnesota River: lessons learned from the Jordan trading program
(2013-08) Zajicek, Michael Nathan
Water quality permit trading in an attractive option lower the costs of pollution cleanup in lakes and rivers, and while similar programs for air pollution have been successful, most attempts at Water Quality Trading have failed. The Jordan Trading Program, based on the Minnesota River, is one of the few exceptions. This paper examines the program to discover how the program succeeds where others have failed. The Jordan Trading has averaged 17 trades a year, and with some assumptions has resulted in cost savings. The river is modeled using a Farrow et. al. (2005) model to show that savings are theoretically possible, even if the program does not act in the same fashion. It was found that while cost savings occur, the facilities in the program are not profit maximizers due to their status as government wastewater treatment facilities, and thus the maximum potential cost savings are not achieve. The program has still been successful, and several suggestions are made for future water quality trading programs.

University Digital Conservancy

Browse by Subject

Browsing by Subject "Pollution"