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Articles 151 - 180 of 9381
Full-Text Articles in Physical Sciences and Mathematics
Saving The Great Basin: Creating Places For The Birds, Bees And Beyond, Carlos Gomez
Saving The Great Basin: Creating Places For The Birds, Bees And Beyond, Carlos Gomez
Hospitality Design Graduate Student Capstones
This project looks at how vacant and underused parcels along the Truckee River in Reno, Nevada, can be rethought as part of a larger ecological system. Rather than treating these parcels as empty leftover spaces, the project sees them as opportunities to create small habitat patches that can support native species, improve stormwater function, and strengthen the river corridor over time. The work focuses on three sites along the Truckee River: California Avenue, Island Avenue, and Commercial Row. Each site responds to a different condition along the urban transect, from a sloped residential river edge to a tighter urban parcel …
The Biowell System: An Integrative Framework That Connects Ecological Sustainability And Mental Wellbeing Through The Regenerative Processes Of Bioswales, Nathan A. Bussa
The Biowell System: An Integrative Framework That Connects Ecological Sustainability And Mental Wellbeing Through The Regenerative Processes Of Bioswales, Nathan A. Bussa
Hospitality Design Graduate Student Capstones
The Biowell System is an evaluative framework that connects ecological sustainability and mental well-being through the regenerative processes of bioswales.
Shelters In Motion, Erin Nicole Vallido Trasmano
Shelters In Motion, Erin Nicole Vallido Trasmano
Hospitality Design Graduate Student Capstones
Shelters in Motion is a modular temporary shelter system for festival and outdoor events that replaces disposable tents with reusable, durable design. Overall reducing environmental impact while significantly improving comfort and user experience.
Local And Indigenous Knowledge, Innovation, And Sustainable Development: Creating Sustainable Futures Amidst Crisis Conditions At The Community Level, Carlos Andrés Arias
Local And Indigenous Knowledge, Innovation, And Sustainable Development: Creating Sustainable Futures Amidst Crisis Conditions At The Community Level, Carlos Andrés Arias
Dissertations and Theses
In 1987, the Brundtland Commission's Our Common Future (1987) made clear the need to reject longstanding development processes and focus on sustainable development. The Commission stressed that actual sustainable development integrates three elements: social development, economic development, and environmental protection. Though developed nations have achieved economic growth through conventional and extractive development practices, these practices have intensified natural disasters driven by climate change, increased food insecurity, and deepened poverty. This has acutely impacted Indigenous and local communities, many of whom face crisis conditions, such as war, terrorism, civil disorder, and their aftermath. Even so, many of these communities successfully implement …
Karstic Cavities Underground Investigation: Gpr And Geotechnical Data Correlation, Mehrez Jamei, Mabrouk Abdelkader, Anwar Ahmed, Yahya Alassaf
Karstic Cavities Underground Investigation: Gpr And Geotechnical Data Correlation, Mehrez Jamei, Mabrouk Abdelkader, Anwar Ahmed, Yahya Alassaf
Journal of Sustainable Mining
This paper focuses on the methodology involving ground penetration radar (GPR) for detecting and localizing random cavities in underground limestone soil, in conjunction with geotechnical data. A GPR survey was conducted alongside field and laboratory geotechnical tests at a field where mining activities are now promoted (Saudi Arabia Northern Borders Province). The paper presents correlations between the instantaneous amplitude of the reflected electromagnetic (EM) waves and rock quantification distributed (RQD), recovery rock parameter (REC), and uniaxial compressive strength (UCS). The GPR investigation proved to be an efficient nondestructive geophysical method for determining: 1) the …
“The New Normal”: California’S Escalating Wildfire Crisis, Alexandra Vasquez
“The New Normal”: California’S Escalating Wildfire Crisis, Alexandra Vasquez
Student Theses 2015-Present
This paper addresses the current state of California's wildfire epidemic and how the increasing effects of climate change have worsened the fires, harming residents' health and the state's economy. The wildfires are shaped by factors such as climate change, land-use choices, and policy designs. California wildfires have worsened substantially in the 21st century, with the worst burns in the 2020 season setting a record of 4.2 to 4.5 million acres destroyed. Given current policies and the administration's disinterest in combating climate change, understanding wildfire history and data is essential to improving California's wildfire resilience, creating sustainable land management practices, and …
The Legacy Of Lead: Lead Exposure's Harmful Effects And Its Concentration In Poc Communities, Layla Sophronia Barber
The Legacy Of Lead: Lead Exposure's Harmful Effects And Its Concentration In Poc Communities, Layla Sophronia Barber
Student Theses 2015-Present
This thesis examines the disproportionate burden of lead exposure carried by low income, POC communities. The systemic nature of this problem is a symptom of a longstanding legacy of environmental injustice in the United States. Decades of federal neglect are reflected in the higher statistics of lead exposure and poisoning in predominantly black communities. While it is understood that lead exposure poses a serious threat to physical health and early cognitive development, there is a discouraging lack of urgency to remove the toxin from non-wealthy communities. The material covered by this thesis aims to identify and correct the discriminatory social …
The Prospect Of F.E.W. Resources: How Food, Energy, And Waste Management Workforce Programs Address Global Equity And Sustainability, Quincy P. Biddle
The Prospect Of F.E.W. Resources: How Food, Energy, And Waste Management Workforce Programs Address Global Equity And Sustainability, Quincy P. Biddle
Student Theses 2015-Present
As a global society, the issues affecting a specific city or country are no longer isolated; instead, they impact other places in myriad ways. Over the past few decades, environmental degradation and economic inequality, both within and between countries, have caused shortages of necessities like food and water, inadequate access to safe energy sources, and increased pollution, impacting people’s prosperity and the well-being of the planet. It is of global interest to remediate these issues for the betterment and progress of society, and thus, an approach to addressing these complications collectively and comprehensively is of utmost importance. This paper investigates …
Secondhand Or Second-Class? Environmental Injustice In Global Textile Waste Trade, Wendy S. Escalante
Secondhand Or Second-Class? Environmental Injustice In Global Textile Waste Trade, Wendy S. Escalante
Student Theses 2015-Present
This paper addresses the issue of textile waste dumping, specifically how secondhand clothing exports from the Global North create environmental, social, and public health burdens in the Global South. The study focuses on case studies in Chile’s Atacama Desert, where shipments of used clothing overwhelm local waste infrastructures and worsen patterns of environmental injustice. Chapter 1 describes the global flows of textile waste, including trade volumes, landfill accumulation, and the impacts of discarded clothing on ecosystem services such as clean water, fertile soils, and breathable air, alongside health risks from microplastic pollution, toxic runoff, and respiratory hazards from textile fires. …
Identifying The Cultural Significance Behind Local Study Sites Used By Marine Scientists, Mackenzie Anonick
Identifying The Cultural Significance Behind Local Study Sites Used By Marine Scientists, Mackenzie Anonick
Honors Theses
This project brings awareness to the cultural significance of places that scientists (specifically marine scientists associated with CCU) study and do field work at. It is important to be respectful of places you work in and understand what environment and land you are working with. It is also important to know your privilege when working in areas of less privilege. For example, CCU students travel to Bucksport on field trips, and the majority of them are not aware of the fact that Bucksport is a largely Black and lower income town that has extreme flooding issues that impact the residents …
Hormonal Seed Primimg As A Sustainable Alternative To Pesticides, Oyekemi Oyetoro, Swayamjit Ray
Hormonal Seed Primimg As A Sustainable Alternative To Pesticides, Oyekemi Oyetoro, Swayamjit Ray
Research and Creative Works Expo
This study investigates the use of hormonal seed priming with Methyl Jasmonate (MeJA) and Methyl Salicylic Acid (MeSA) as a sustainable alternative to synthetic pesticides. By inducing Systemic Acquired Resistance (SAR) and Induced Systemic Resistance (ISR), these treatments aim to prepare plant defenses for rapid response to future herbivory with reduced reliance on chemical applications. The research specifically explores the growth-defense trade off, evaluating how various hormonal concentrations impact both pest resistance and seedling vigor. The findings identify optimal priming protocols that balance robust protection against herbivores with the maintenance of primary vegetative growth
Brine Solidification And Metals Sequestration Using Lignocellulosics, Frank Kvietok
Brine Solidification And Metals Sequestration Using Lignocellulosics, Frank Kvietok
World of Coal Ash Proceedings
Coal ash has historically been used as a convenient, on-site solidification material for brines generated from flue gas desulfurization at power plants. As alternate utilization scenarios are developed for coal ash, lignocellulosic (wood-based) sorbents can serve as a highly efficient substitute for the solidification process. Results will be shared for a variety of different brine types: thermally reduced, thermally reduced and neutralized, and reverse osmosis. In addition to solidification performance, which demonstrated a 3-4x mass of liquid vs mass of sorbent factor, studies were conducted to quantify the strength of binding to the wood-based sorbent for a broad range of …
Practical Guidelines For Pump Testing Of Ccr: Workflow, Design, And Lessons Learned., Nathanial Keller, Brian Hennings, Vic Modeer, Katie Moran
Practical Guidelines For Pump Testing Of Ccr: Workflow, Design, And Lessons Learned., Nathanial Keller, Brian Hennings, Vic Modeer, Katie Moran
World of Coal Ash Proceedings
This session presents a streamlined approach for pump testing of coal combustion residuals (CCR) to maximize hydraulic information with limited well installations, variable pumping rates, and short tests. Pre-test forward modeling identifies well offsets (typically 5–10 ft) and test durations (~2–6 hours) to yield measurable and analyzable drawdown at observation wells despite low pumping rates. Field execution consists of short step-drawdown testing to evaluate well specific capacity and select pumping rates for a constant rate test with one or more observation wells. Test results facilitate analysis of transmissivity and storativity of the CCR. Applied at two Midwestern sites with different …
Simplified Approximate Procedure For Assessing The Implications Of Updated Usgs Seismic Hazard Models On Seismic Stability Assessments Of Ccr Impoundment Facilities, Nick Mcclung, Matt Bishop, Adrian Pena-Iguaran, Seda Gokyer-Erbis
Simplified Approximate Procedure For Assessing The Implications Of Updated Usgs Seismic Hazard Models On Seismic Stability Assessments Of Ccr Impoundment Facilities, Nick Mcclung, Matt Bishop, Adrian Pena-Iguaran, Seda Gokyer-Erbis
World of Coal Ash Proceedings
Selection of appropriate seismic design ground motions remains a key challenge for seismic stability assessments of coal combustion residual (CCR) impoundment facilities, particularly where regulatory guidance does not specify a required hazard model. This paper examines the implications of using Uniform Hazard Spectra (UHS) derived from the 2014 versus the 2018 U.S. Geological Survey (USGS) National Seismic Hazard Model (NSHM) for seismic amplification and stability evaluations of the Tennessee Valley Authority (TVA) Widows Creek Fossil (WCF) Plant CCR Management Units. The 2018 NSHM incorporates updated understanding of seismicity in the central and eastern United States and generally predicts higher ground …
Before The Limit Hits: Lessons From A Proactive Construction Air Monitoring Program, Brian Egan, Nicholas Golden, Wendy Depp
Before The Limit Hits: Lessons From A Proactive Construction Air Monitoring Program, Brian Egan, Nicholas Golden, Wendy Depp
World of Coal Ash Proceedings
This presentation describes a comprehensive air monitoring program designed to protect workers and nearby neighborhoods during ash pond closure work. The program uses three main components: project (or boundary) monitoring at the site perimeter to track dust near the project boundaries, work area monitoring placed near active construction zones, and personal sampling on individual workers at regular intervals. Together, these approaches provide data on both community impacts and worker exposures, helping the team respond quickly when levels approach action limits. The Teams actions prior to exceedance of regulatory limits has helped prevent exposures. The talk will explain how monitors are …
Integrating Advanced Geochemical Workflows With Modern Statistical Tools To Improve The Decision-Making Process At Ccr Sites, A Case Study, Glenna Thomas
World of Coal Ash Proceedings
While statistical assessment provides the foundation for CCR compliance reporting, incorporating a holistic geochemical framework transforms statistics from a compliance requirement into a powerful predictive tool. Strategic geochemical insight established the basis of understanding needed to support successful statistical approaches and to ensure that statistical outcomes reflect actual groundwater behavior. Whether it is trend analysis, delineating source mechanism, or updating geochemical conceptual site models (GCMs), geochemical context provides the technical foundations for statistical outputs and methods. A continuously refined GCSM enhances the ability to anticipate how groundwater chemistry should evolve, improving interpretation and predictive capability. This allows practitioners to understand …
Monitored Natural Attenuation Evaluation And Additional Characterization Of A Ccr Unit Lithium Groundwater Plume, Matt Barickman, Adam Piestrzeniewicz Pg
Monitored Natural Attenuation Evaluation And Additional Characterization Of A Ccr Unit Lithium Groundwater Plume, Matt Barickman, Adam Piestrzeniewicz Pg
World of Coal Ash Proceedings
Monitored Natural Attenuation (MNA) refers to the reliance on natural attenuation processes (within the context of a carefully controlled and monitored site cleanup approach) to meet groundwater protection standards (GPS) for a CCR unit within a reasonable time frame (USEPA, 1999). MNA is being evaluated as an adaptive management strategy for a CCR unit groundwater plume with statistically significant lithium concentrations above GPS, though with little risk of offsite migration. A previous MNA evaluation was performed for the lithium plume following the United States Environmental Protection Agency (USEPA) “tiered lines of evidence approach” (USEPA, 2015), which determined that there were …
Establishing Groundwater Monitoring Systems Under The Legacy Rule: A Systematic Approach For Utilities, Chris Hoglund
Establishing Groundwater Monitoring Systems Under The Legacy Rule: A Systematic Approach For Utilities, Chris Hoglund
World of Coal Ash Proceedings
The USEPA’s Legacy CCR Rule introduces new requirements for establishing groundwater monitoring systems at Legacy Surface Impoundments (LSIs) and Coal Combustion Residual Management Units (CCRMUs). These requirements present unique challenges for electric utilities, particularly at inactive or historically operated facilities where subsurface data are limited and CCR units may have nontraditional configurations such as linear roadways, elongated embankments, or distributed disposal areas. Utilities must also determine how best to apply single-unit or multi-unit monitoring approaches, integrate newly regulated units into existing monitoring networks, and align monitoring system design with planned closure strategies. This presentation outlines a systematic, defensible framework to …
Risk Evaluation Of Linear Coal Combustion Residual Management Unit (Ccrmu) Fills, Qian Zhang, Andrew Bittner, John Kondziolka, Masoud Arshadi
Risk Evaluation Of Linear Coal Combustion Residual Management Unit (Ccrmu) Fills, Qian Zhang, Andrew Bittner, John Kondziolka, Masoud Arshadi
World of Coal Ash Proceedings
In 2024, the US Environmental Protection Agency (US EPA) established new regulations for coal combustion residual management units (CCRMUs), defined as coal combustion residual (CCR) deposits placed on power plant properties outside of landfills or surface impoundments. US EPA supported the rulemaking with modeling-based risk analyses and established regulatory requirements based on fill size. Linear CCRMU, such as backfill along pipelines or haul roads, have individual segments that may be composed of a small amount of mass below the threshold for regulation, but the cumulative mass over the full linear feature extent may exceed regulatory thresholds. This study applies US …
Application Of Mine Tailings Flow Failure Assessment On Ccr, Zachary Fallert
Application Of Mine Tailings Flow Failure Assessment On Ccr, Zachary Fallert
World of Coal Ash Proceedings
A new geotechnical stability analysis method has been implemented for a CCR surface impoundment to aid in design for temporary cut slopes and final closure grades. Conditions have come to light after significant tailings dam failures occurred across the globe, specifically those exhibiting flow failures (i.e. failures in which tailings behave a liquid and flow out of the facility). These failures have come under intense scrutiny as the failures pose significant risk to public safety and the environment and have been observed in CCR. Additionally, static liquefaction has arisen as another potential but less well understood causative mechanism. As the …
Lessons Learned: Commissioning An Fgd Wastewater Treatment System, Bella Triolet, Mckale Grant, Louis Manigault
Lessons Learned: Commissioning An Fgd Wastewater Treatment System, Bella Triolet, Mckale Grant, Louis Manigault
World of Coal Ash Proceedings
Stantec recently supported commissioning a flue gas desulfurization (FGD) Wastewater Treatment System in accordance with the 2020 Environmental Protection Agency (EPA) Effluent Limitations Guidelines (ELG) Rule, which requires that coal fired power plants meet their more stringent requirements by December 31, 2025. With the addition of the 2024 EPA ELG Rule, coal fired power plants will now be expected to move to zero liquid discharge (ZLD) systems or permanently cease coal combustion by 2034. Due to this change, it is likely that coal fired power plants will be looking to design and install ZLD systems within the next decade. While …
Risk Evaluation Of Linear Coal Combustion Residual Management Unit (Ccrmu) Fills, Qian Zhang, Andrew Bittner, John Kondziolka, Masoud Arshadi
Risk Evaluation Of Linear Coal Combustion Residual Management Unit (Ccrmu) Fills, Qian Zhang, Andrew Bittner, John Kondziolka, Masoud Arshadi
World of Coal Ash Proceedings
In 2024, the US Environmental Protection Agency (US EPA) established new regulations for coal combustion residual management units (CCRMUs), defined as coal combustion residual (CCR) deposits placed on power plant properties outside of landfills or surface impoundments. US EPA supported the rulemaking with modeling-based risk analyses and established regulatory requirements based on fill size. Linear CCRMU, such as backfill along pipelines or haul roads, have individual segments that may be composed of a small amount of mass below the threshold for regulation, but the cumulative mass over the full linear feature extent may exceed regulatory thresholds. This study applies US …
Site Characterization, Design, Permitting, And Construction For Clean Closure Of A Small But Challenging Legacy Ccr Disposal Impoundment, John Garten, Bob Baker, Lee Lenhart
Site Characterization, Design, Permitting, And Construction For Clean Closure Of A Small But Challenging Legacy Ccr Disposal Impoundment, John Garten, Bob Baker, Lee Lenhart
World of Coal Ash Proceedings
The Lay of Land Area (LOLA) is a 10-acre (40,468 square meters) legacy disposal impoundment containing approximately 55,000 cubic yards (42,000 cubic meters) of sluiced coal combustion residuals (CCRs) produced during startup operations of a former fossil plant. Most of its perimeter is bounded by water, with a river to the north and a cooling water lake to the south. The entire area lies within a 100-year floodplain, is heavily forested, and groundwater is typically encountered within a few feet of the existing ground surface. As part of an overall CCR closure-by-removal and ash beneficiation program, planning, design, permitting, and …
Trimble County Pond Closures, Steven Turner, Shanti Montgomery
Trimble County Pond Closures, Steven Turner, Shanti Montgomery
World of Coal Ash Proceedings
The Trimble County Closure Project is a 5-year project to close the 40-acre (161,900 square meters) Gypsum Storage Pond (GSP) through closure-by-removal and the 100-acre (404,700 square meters) Bottom Ash Pond (BAP) through closure-in-place in accordance with coal combustion residual (CCR) Rule. The excavated gypsum from the GSP was “Beneficially Reused” to fill the BAP to the prescribed grade for drainage through a monitored outfall to the adjacent creek. The daily plant produced CCRs of fly ash, bottom ash, and gypsum were also used for four years to supplement the filling of the BAP as well as several onsite soil/rock …
Dewatering System Operations And Modeling Of A Bottom Ash Ccr Surface Impoundment, Craig Schuettpelz, Todd Stong, Ben Sieren
Dewatering System Operations And Modeling Of A Bottom Ash Ccr Surface Impoundment, Craig Schuettpelz, Todd Stong, Ben Sieren
World of Coal Ash Proceedings
Dewatering of coal combustion residual (CCR) surface impoundments is a technically challenging item for sites with CCR units at closure. Generation has ceased at this site where fly ash was mostly sold for beneficial use and bottom ash was sluiced to composite-lined CCR surface impoundments to passively drain prior to landfilling. During site closure and restoration, bottom ash and relatively minor amounts of other permitted waste materials were consolidated into the site’s landfill and bottom ash impoundment. The bottom ash impoundment entered closure 5 years ago with installation of a final cover system and construction of a sump to allow …
Building Better Partnerships: Design-Build Lessons From The Ash Pond Closure Front Lines, Brian Egan, Nicholas Golden, Mark Edlebeck
Building Better Partnerships: Design-Build Lessons From The Ash Pond Closure Front Lines, Brian Egan, Nicholas Golden, Mark Edlebeck
World of Coal Ash Proceedings
This presentation shares lessons learned on an ash pond dig-and-haul project delivered by a design-build team with CTI providing engineering and Fisher Contracting delivering construction services. CTI and Fisher Contracting will discuss how they formed their partnership, what makes a good teaming arrangement work, and the challenges that come with working closely together. This team has worked side by side from early design through construction, which has helped cut costs and keep the project on schedule. The talk will show how the partners divide tasks, then adjust roles as needed instead of locking into a fixed plan. In some cases, …
Illinois Coal Ash Impoundment Assessment, Randy Locke
Illinois Coal Ash Impoundment Assessment, Randy Locke
World of Coal Ash Proceedings
Coal combustion residuals (CCR) present one of the most significant waste management challenges in the United States. Illinois hosts 72 coal ash impoundments at 23 facilities across 22 counties. In 2019, the state enacted Public Act 101 0171 (Coal Ash Pollution Prevention Act), followed by Illinois Administrative Code Title 35, Part 845, establishing CCR surface impoundment standards. Even with federal and state requirements, significant gaps remain in identifying management options and site-specific risks. Key limitations include: (1) incomplete understanding of ash composition and variability within and among impoundments; and (2) fragmented information on impoundment physical properties, operational status, and geological …
A Novel Geospatial Tool For Assessing Risks And Opportunities For Conversion Of Ccr Closures Into Productive Solar Energy Generation Sites, Marc Theisen
World of Coal Ash Proceedings
Closure of Coal Combustion Residuals (CCR) surface impoundments and landfills offers unique opportunities for conversion to solar power sites with the potential to offset costs of post-closure care via generation of clean electricity. In 2023 the US Environmental Protection Agency (EPA) collaborated with the National Renewable Energy Laboratory (NREL) to create a report entitled “Coal Ash Disposal Sites and Opportunities for Solar Photovoltaic Development” (EPA Publication #540-S-23-004). The purpose of this document was to identify closed CCR units and provide key factors for their potential for solar photovoltaic (PV) development. In 2022, the EPA’s RE-Powering Initiative identified 772 current CCR …
Establishing A Roadmap For The Planning, Design, And Construction Of A Water Treatment System For A Ccr Unit Closure, Mariah Schroeder, Matthew Balance
Establishing A Roadmap For The Planning, Design, And Construction Of A Water Treatment System For A Ccr Unit Closure, Mariah Schroeder, Matthew Balance
World of Coal Ash Proceedings
The treatment of water from a CCR unit is an important step in the closure strategy for surface impoundments to comply with 40 CFR §257.102(d)(2)(i) of the CCR rule. The unwatering and dewatering of a surface impoundment is a necessary first step in ensuring that the eventual closure of the unit will meet the requirements for closure in place described in 40 CFR §257.102(d). Depending on the operational conditions and requirements of the plant, the NDPES discharge limits, and the impacted water quality, the water treatment system needs can vary greatly. This presentation will outline a roadmap for assessment, evaluation, …
The Modern Hydraulic Containment System: Using Automation, Telemetry And Data Dashboarding To Meet Client And Regulatory Objectives At A Coal Combustion Residual (Ccr) Site, Brian Hennings, Christopher Glidden, Vic Modeer, J. Austin Bond
The Modern Hydraulic Containment System: Using Automation, Telemetry And Data Dashboarding To Meet Client And Regulatory Objectives At A Coal Combustion Residual (Ccr) Site, Brian Hennings, Christopher Glidden, Vic Modeer, J. Austin Bond
World of Coal Ash Proceedings
The site, a former coal-fired power plant in southern Illinois, generated coal combustion residuals (CCR) such as bottom ash and fly ash stored in surface impoundments. Adjacent to the Ash Pond, boron was detected in groundwater above the state standard of 2 mg/L. In late 2025, a groundwater extraction system was installed to control hydraulic conditions and prevent boron migration offsite until source control measures are completed. The system is expected to operate for up to 11 years. Three-dimensional groundwater modelling was used to support system design, helping to identify optimal well locations and flow rates for effective containment. Components, …