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Articles 61 - 90 of 12544
Full-Text Articles in Entire DC Network
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 …
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 …
From Demolition To Digital: Using Virtual Reality To Interpret Hamilton House, Hannah R. Miller
From Demolition To Digital: Using Virtual Reality To Interpret Hamilton House, Hannah R. Miller
Graduate Final Projects
This master’s project investigates the potential of digital reconstruction as a tool for documenting and interpreting demolished historic resources, using Hamilton House as a case study. Employing a mixed-methods approach, the research integrates archival analysis with digital modeling to recreate the spatial context of the house. By grounding the digital model in historical evidence, this study examines how virtual reconstruction can be used to interpret social relationships, patterns of use, and lived experiences that are not fully captured through traditional means of documentation. This project also considers the interpretive implications of reconstructing using fragmentary historical data, addressing the possibilities and …
Establishing Sustainable Vegetation On A Challenging Legacy Ccr Site, Derek Oosterhouse, Blake Arthur
Establishing Sustainable Vegetation On A Challenging Legacy Ccr Site, Derek Oosterhouse, Blake Arthur
World of Coal Ash Proceedings
American Electric Power (AEP) is closing and restoring a legacy Coal Combustion Residuals (CCR) site in Ohio that once held a power plant that pioneered innovative steam generation technology. The plant was closed in 1975. Today, the legacy CCR site is being transformed back to natural, sustainable vegetation. To comply with and close the Stormwater Pollution Prevention Plan (SWPPP) permit, permanent stabilization is required on the site. AEP, one of the largest electric companies in the country, holds a core principle to respect the environment through creative sustainable solutions. AEP connected with Profile Products, the world’s largest manufacturer and supplier …
Future Strategies For Beneficial Use Harvesting, Gabe Lang, Patrick Kiser
Future Strategies For Beneficial Use Harvesting, Gabe Lang, Patrick Kiser
World of Coal Ash Proceedings
TVA is the largest public power company in the U.S. and has historically operated a fleet of 12 coal-fired plants as part of their diverse generating portfolio. To date, eight of the coal plants have been retired and the remaining four plants are projected to shut down in the next couple of decades. The decommissioning of these plants is driving a transition to harvesting of ponded and landfilled CCR’s to continue to support ready-mix concrete and other industries that enable infrastructure development. However, the regional market demand limits the ability to initiate widespread harvesting activities during near-term CCR Unit closure …
Methods To Enhance Groundwater Remediation During Cbr And Mass Transfer Controls On Post-Closure Groundwater Cleanup At Ccr Impoundments, Sean Larkin, Jacob Chu, John Blue
Methods To Enhance Groundwater Remediation During Cbr And Mass Transfer Controls On Post-Closure Groundwater Cleanup At Ccr Impoundments, Sean Larkin, Jacob Chu, John Blue
World of Coal Ash Proceedings
Utilities are implementing closure‑by‑removal (CBR) of coal combustion residual (CCR) impoundments as part of corrective action programs to meet groundwater protection standards (GWPSs) and are evaluating closure strategies for Legacy Units. Although CBR and associated decanting and dewatering systems can substantially reduce source mass and improve groundwater quality, lingering “tail” concentrations in the aquifer are often observed after closure because groundwater remediation typically requires extended timeframes. These persistent concentrations may be compounded by secondary source zones beneath the former impoundment, where constituent mass stored in low‑permeability materials or immobile pore spaces is slowly released into the transmissive aquifer after CBR. …
A Cost-Effective, Low-Impact Remedial Approach For Metals: Utilizing Phyto-Enhancement To Accelerate Ph Adjustment Of Shallow Groundwater, Jerry Wylie, Thomas Colton
A Cost-Effective, Low-Impact Remedial Approach For Metals: Utilizing Phyto-Enhancement To Accelerate Ph Adjustment Of Shallow Groundwater, Jerry Wylie, Thomas Colton
World of Coal Ash Proceedings
SynTerra will present a unique, low-cost, low-impact approach to metals remediation in shallow groundwater at a former industrial site located in the Atlantic Coastal Plain. The approach employs pH adjustment of groundwater using agricultural lime coupled with the use of daikon radish to augment lime contact time and to increase depth of soil augmentation. This method is designed to be a more sustainable, less resource-intensive, and less technically challenging remedial alternative with lower estimated overall costs. The primary corrective action—source removal—has been completed. However, the oxidation of residual sulfide-bearing minerals has resulted in persistent low-pH groundwater, which increases the solubility …
Ccr Impoundment Closure: Encapsulation Design Using Closure Cap And Cutoff Wall, John Klamut, A. Edward Sciulli, Kevin Bortz
Ccr Impoundment Closure: Encapsulation Design Using Closure Cap And Cutoff Wall, John Klamut, A. Edward Sciulli, Kevin Bortz
World of Coal Ash Proceedings
When closing a CCR Impoundment while leaving CCR in place, 40 CFR 257.102 requires minimizing post-closure infiltration of liquid into the CCR. This presentation will provide a description of a closure plan for a 16-acre impoundment in Indiana to accomplish this criteria. Key components of the closure plan which will be presented including consolidation of CCR into a smaller footprint due to questionable underlying clay layer identified in a portion of the impoundment and the design of a geosynthetic and soil cap system. A Soil-Cement-Bentonite (SCB) cutoff wall will be constructed to enclose the portion of the impoundment where CCR …
The Effect Of Closure In Place On Groundwater Performance Objectives, Dennis Connair, Jason Lach, Rachel Bosch
The Effect Of Closure In Place On Groundwater Performance Objectives, Dennis Connair, Jason Lach, Rachel Bosch
World of Coal Ash Proceedings
The effect of closure in place (CiP) of a coal combustion residual (CCR) surface impoundment on the achievement of groundwater remedial performance objectives is evidenced in groundwater monitoring data. The CCR unit is located over a major alluvial aquifer adjacent to a navigable river. The unit is separated from the aquifer by an unsaturated zone and the compliance monitoring wells are located at the unit boundary. Sluicing of CCR to the unit was ceased in early 2020 with dry placement of CCR from other units and CiP/installation of a composite cap substantially completed by the end of 2020. Groundwater corrective …
Integrated Groundwater Flow And Transport Modeling For Coal Combustion Residual (Ccr) Sites: From Closure Permitting To Corrective Action, Brian Hennings, Pejman Rasouli, Vic Modeer, Rhys Fuller
Integrated Groundwater Flow And Transport Modeling For Coal Combustion Residual (Ccr) Sites: From Closure Permitting To Corrective Action, Brian Hennings, Pejman Rasouli, Vic Modeer, Rhys Fuller
World of Coal Ash Proceedings
This session describes a coordinated multi-year effort to assess and manage groundwater quality at five CCR impoundments. The objectives were to (i) develop site-specific hydrogeologic and geochemical conceptual models; (ii) quantify groundwater flow and constituent transport under baseline and post-closure conditions; and (iii) design and evaluate corrective action strategies that achieve regulatory compliance and provide a defensible framework for long-term monitoring and management. The program highlights a phased approach aligned with regulatory requirements, progressing from closure construction to corrective action planning for detected exceedances. Comprehensive hydrogeologic datasets including borehole lithology, hydraulic testing, CCR source water characterization, and groundwater monitoring were …
Navigating Regulatory Uncertainty In Ccr Management: A Panel Discussion, Mark Rokoff, Richard Huggins, Martha Thomsen, Roger Clarke
Navigating Regulatory Uncertainty In Ccr Management: A Panel Discussion, Mark Rokoff, Richard Huggins, Martha Thomsen, Roger Clarke
World of Coal Ash Proceedings
The only certainty in CCR management is regulatory uncertainty! As we approach 2026, the industry and “CCR Universe” faces significant challenges and uncertainties due to the proposed EPA rule expected early in the year. This panel discussion will bring together a diverse group of industry experts, including representatives from associations (e.g. EEI), legal professionals, utility representatives, and consultants, to address the hard questions head-on and provide insight to and understanding of the implications of these regulatory changes. Key discussion points will include: • Legal Ramifications and Possible Pathways for 2026: Exploring the potential major pathways considering the proposed regulations and …
Corrective Action Alternative Evaluation For Surface Impoundment Remedy – Two Case Study Examples, Qian Zhang, Andrew Bittner
Corrective Action Alternative Evaluation For Surface Impoundment Remedy – Two Case Study Examples, Qian Zhang, Andrew Bittner
World of Coal Ash Proceedings
Illinois Administrative Code Part 845 requires owners and operators of coal combustion residual (CCR)-containing impoundments with groundwater protection standard (GWPS) exceedances to perform a Corrective Action Alternatives Analysis (CAAA) to evaluate viable remedies prior to selecting and implementing corrective action. The goal of a CAAA is to holistically evaluate a range of factors for the various corrective actions being considered at an impoundment. This presentation summarizes two CAAAs conducted for surface impoundments (SIs) at two power plants. Each CAAA applied a consistent decision framework that evaluates corrective action options using multiple performance criteria, such as: • Magnitude of Reduction of …
Ensuring Quality Geosynthetics Installations Throughout The Project Lifecycle, Glen Toepfer
Ensuring Quality Geosynthetics Installations Throughout The Project Lifecycle, Glen Toepfer
World of Coal Ash Proceedings
Geosynthetics serve numerous functions in containment systems used within the Coal Ash Industry and ultimately protect the site owner from liability. A failure in the geosynthetics containment system exposes the owner to liability; therefore, it is imperative that these geosynthetic containment systems be installed correctly to mitigate the risk of failure. Avoiding failure is not just the responsibility of the geosynthetics installer – it is the responsibility of every party involved in the project lifecycle from conception through post-closure. In fact, the success of the field installation is largely determined before the first panel of geomembrane is ever installed. The …
Evaluating And Managing Ccr Variability At An Active Beneficial Use Clean Closure Site, John Garten, Bob Baker, Lee Lenhart
Evaluating And Managing Ccr Variability At An Active Beneficial Use Clean Closure Site, John Garten, Bob Baker, Lee Lenhart
World of Coal Ash Proceedings
The basin is a 132-acre (534,200 square meter) coal combustion residual (CCR) disposal impoundment that has been undergoing closure-by-removal since 2021, with CCRs harvested for use in concrete manufacturing. Excavated CCRs are processed on-site through initial drying and screening before being routed through a thermal beneficiation process. Despite an extensive pre-closure CCR characterization program, pockets of material encountered in 2025 caused significant off-specification issues for the beneficiation feedstock that required immediate corrective action. To address this, a supplemental surveying, sampling, and on-site testing program was implemented to obtain additional grainsize and Loss on Ignition (LOI) data for active and upcoming …
Identifying And Controlling Landfill Construction Impacts To Stormwater Flow Paths, Kory Anstead
Identifying And Controlling Landfill Construction Impacts To Stormwater Flow Paths, Kory Anstead
World of Coal Ash Proceedings
This presentation will examine the engineering challenges and lessons learned associated with construction impacts and altered stormwater flow paths in the vicinity of a Sediment Pond adjacent to a newly constructed landfill. During construction activities, the sediment basin liner experienced multiple instances of flotation. Early corrective measures were implemented as quick fixes; however, these proved ineffective and ultimately necessitated more comprehensive solutions once the underlying causes were better understood. The presentation will begin with an analysis of the initial liner flotation events, focusing on the conditions that led to the problem, the immediate responses, and the eventual engineered solution. It …
Innovative Analysis Of Groundwater Data For Scalable, Defensible, And Predictive Compliance, Shannon Zahuranec
Innovative Analysis Of Groundwater Data For Scalable, Defensible, And Predictive Compliance, Shannon Zahuranec
World of Coal Ash Proceedings
Groundwater monitoring networks at coal combustion residual (CCR) facilities now yield dataset volumes that routinely exceed the capacity of traditional, univariate interpretation. This presentation introduces a scalable multivariate and machine learning (ML) framework that prioritizes understanding data structure before predictive models are applied. The workflow applies Principal Component Analysis and other multivariate statistics to groundwater datasets, to illustrate how unsupervised learning can rapidly reveal dominant sources and controls on impacted and unimpacted groundwater quality. The talk frames multivariate analysis as a practical portfolio management tool, emphasizing inference categories rather than concentrations or site identifiers. Fleet-scale multivariate screening offers strategic advantages …
Revolutionizing Closure Systems: The Performance Advantages Of Structured Geomembranes, Scott Perugia
Revolutionizing Closure Systems: The Performance Advantages Of Structured Geomembranes, Scott Perugia
World of Coal Ash Proceedings
Coal combustion residual (CCR) containment facilities have traditionally been closed using methods that have changed little over several decades, but structured geomembranes are now reshaping closure design by improving slope stability, increasing interface friction, enhancing drainage, and providing long-term durability. Two systems are emerging as leading solutions: a structured geomembrane paired with a geotextile and vegetative cover, and a structured geomembrane paired with engineered turf. This presentation compares these approaches using field performance data, laboratory testing, and lessons learned, with emphasis on key factors such as infiltration control, drainage efficiency, slope stability, constructability, and regulatory compliance. The engineered turf system …
From Clogs To Compliance: Overcoming Persistent Leachate Head Issues In Ccr Landfills, Breanne Kahnk, Zachary Bauman
From Clogs To Compliance: Overcoming Persistent Leachate Head Issues In Ccr Landfills, Breanne Kahnk, Zachary Bauman
World of Coal Ash Proceedings
State and federal regulations require that landfills, including coal combustion residual (CCR) landfills, be designed and operated to maintain leachate head levels of less than 30 centimeters (approximately 1 foot). While proper leachate collection system design and routine maintenance are critical for meeting this requirement, challenges such as clogging of drainage media, pipes, fittings and/or pipeline perforations, settlement of collection pipes, and breaks in the piping system can lead to elevated leachate levels, posing risks to compliance and long-term system performance. TRC will provide an overview of leachate collection system regulatory requirements along with design, operation, and maintenance strategies that …
Standardization Of Coal Ash Testing, Classification, And Harvesting, Benjamin Gallagher, Chris Frishcosy, Eric Hageman
Standardization Of Coal Ash Testing, Classification, And Harvesting, Benjamin Gallagher, Chris Frishcosy, Eric Hageman
World of Coal Ash Proceedings
Standards such as product specifications, test methods, practices and guides play a crucial role in supporting both commerce and science. Standardization helps build consistency and reliability whether it pertains to the performance of an ingredient in a product or in the measurement of a material characteristic. Coal combustion products, such as coal ash and synthetic gypsum, exhibit unique characteristics and many standard have been developed to characterize these materials and support their beneficial use. ASTM is a voluntary, consensus-based organization, and publishes many standards related to coal combustion products. Currently, there are seven ASTM standards related to chemical analysis of …
Impacts Of Updating Background Groundwater Statistics For Ccr Compliance, May Raad, Molly Reeves
Impacts Of Updating Background Groundwater Statistics For Ccr Compliance, May Raad, Molly Reeves
World of Coal Ash Proceedings
In 2017, many power utilities adopted statistical methods to comply with the EPA’s Coal Combustion Residuals (CCR) Rule under the Hazardous and Solid Waste Management System. By 2017–2018, most owners completed initial statistical evaluations for detection and assessment monitoring to meet CCR deadlines. Groundwater sampling and analysis requirements in Parts 257.95, 257.98, and 257.102 are critical for compliance, yet implementation is complex. Subsections 257.93(f) and (g) lack clarity on which statistical tests to apply or how to address distributions and outliers. Additionally, the Rule does not specify when or how to update background threshold values (BTVs), though EPA’s Unified Guidance …
Investigation Of A Historical Coal Combustion Residuals Management Unit (Ccrmu), Todd Stong, Shane Stockdill, Erin Hunter
Investigation Of A Historical Coal Combustion Residuals Management Unit (Ccrmu), Todd Stong, Shane Stockdill, Erin Hunter
World of Coal Ash Proceedings
Rainbow Energy Center’s (REC’s) Coal Creek Station has managed coal combustion residuals (CCR) in various engineered impoundments and landfills since plant operation began in 1978. Since then, waste containment methods have evolved resulting in significant changes to their CCR management practice. In the late 1980s and early 1990s REC closed several existing CCR units with natural soil liners and constructed several new CCR units with composite liner systems. One of the closed units was an area now referred to as North Section 16, an impoundment that received CCR including bottom ash, fly ash, and flue gas desulfurization material. North Section …
Optimization Of Remedial Strategies For Ccr Site Corrective Action Through Advanced Geochemical Modeling, Cole Mayer, Pj Nolan
Optimization Of Remedial Strategies For Ccr Site Corrective Action Through Advanced Geochemical Modeling, Cole Mayer, Pj Nolan
World of Coal Ash Proceedings
The power industry is actively designing and implementing corrective measures for Coal Combustion Residuals (CCR). In many cases, these measures include active remedies such as pump and treat, in-situ injection, or reactive barriers, all of which demand a thorough understanding of the underlying geochemical system. Depending on the geochemical characteristics of an aquifer, different chemical reagents can achieve varying degrees of success or even be detrimental to the remediation of the site. Advanced geochemical modeling is an invaluable tool for developing a remedy that is optimized to the site-specific geological, hydrological, and geochemical environment. In the case study presented here, …
The Importance Of Evaluating Drinking Water Exposure Pathway For Assessing Risks From Ccr Sites, Ari Lewis, Ishita Shrivastava
The Importance Of Evaluating Drinking Water Exposure Pathway For Assessing Risks From Ccr Sites, Ari Lewis, Ishita Shrivastava
World of Coal Ash Proceedings
Potential release of constituents present in coal combustion residuals (CCR) from CCR sites can pose risks to downgradient receptors via multiple exposure pathways. For residential receptors, these pathways include ingestion of impacted groundwater (when used as drinking water), other household uses (e.g., cooking, gardening), dermal contact during activities such as showering with impacted water or swimming in affected waterbodies, and ingestion of fish from affected waterbodies. Among these, the ingestion of groundwater used as drinking water is often the primary pathway driving potential risks (as identified in the risk assessment conducted by the United States Environmental Protection Agency in 2014). …
Alternative Cover Permitting And The Ccr Rule, Evan Andrews, Victor Damasceno
Alternative Cover Permitting And The Ccr Rule, Evan Andrews, Victor Damasceno
World of Coal Ash Proceedings
Federal rules (40 CFR Parts 9, 257 and 261) that regulate coal combustion residuals (CCR) created a significant demand associated with closure of coal ash management and storage facilities using liner systems. Timelines associated with these facility closures combined with substantial project scale and potential for future mining /reuse has driven the need for closure systems that perform beyond the prescriptive soil / geomembrane caps outlined in the federal regulations. As outlined in section 257.102 (d)(3)(i) of the CCR Rule, the standard cover system must include an infiltration layer of at least 18 inches of earthen material and an erosion …
Demystifying Large Language Models: How Ai Is Transforming Data, Compliance, And Decision-Making In Coal Ash And Environmental Management, Scott Pfeiffer
Demystifying Large Language Models: How Ai Is Transforming Data, Compliance, And Decision-Making In Coal Ash And Environmental Management, Scott Pfeiffer
World of Coal Ash Proceedings
The environmental and coal combustion residuals (CCR) industries generate vast amounts of information—from groundwater monitoring reports and RCRA documentation to closure plans and analytical data. Managing, interpreting, and communicating this information is a growing challenge for utilities, regulators, and consultants alike. Large Language Models (LLMs), such as OpenAI’s GPT architecture, represent a breakthrough in how organizations can interact with their technical data. These models use deep neural networks trained on billions of words to understand, summarize, and generate language with human-like accuracy. When securely adapted for enterprise use, LLMs can automate routine reporting, extract data from technical documents, generate regulatory …
The Age-Dependent Resident Myonuclear Multi-Omic Response To An Acute Skeletal Muscle Hypertrophic Stimulus In Mice, Pieter J. Koopmans, Ronald G. Jones, Ana Regina Cabrera, Francielly Morena, Nicholas P. Greene, John J. Mccarthy, Ahmed Ismaeel, Yuan Wen, Kevin A. Murach
The Age-Dependent Resident Myonuclear Multi-Omic Response To An Acute Skeletal Muscle Hypertrophic Stimulus In Mice, Pieter J. Koopmans, Ronald G. Jones, Ana Regina Cabrera, Francielly Morena, Nicholas P. Greene, John J. Mccarthy, Ahmed Ismaeel, Yuan Wen, Kevin A. Murach
Physiology Faculty Publications
A detailed analysis of how muscle fiber nuclei (myonuclei) respond to a hypertrophic stimulus could provide a critical step toward understanding compromised skeletal muscle plasticity with age. We used recombination-independent doxycycline-inducible myonucleus-specific fluorescent labelling, tissue RNA-sequencing, myonuclear DNA methylation analysis, multi-omic integration, and single myonucleus RNA-sequencing (smnRNA-seq) to define the molecular characteristics of adult (6–8 month) and aged (24 month) murine skeletal muscle after acute mechanical overload (MOV). In adult and aged MOV muscles, we found that: 1) similarities in the transcriptional response to loading—specifically in metabolism genes – were partly explained by a post-transcriptional microRNA-mediated mechanism that we corroborated …
Calibration Refinement Of Aashto Paveme For Kentucky Asphalt Overlays, Clayton S. Cook, Kean H. Ashurst Jr., Clark Graves
Calibration Refinement Of Aashto Paveme For Kentucky Asphalt Overlays, Clayton S. Cook, Kean H. Ashurst Jr., Clark Graves
Kentucky Transportation Center Research Report
The Kentucky Transportation Cabinet (KYTC) uses AASHTOWare’s Pavement ME Design Version 3.0 (PaveME) to develop mechanistic-empirical designs for new and reconstructed pavements. Transfer functions used for estimating pavement distress in PaveME rely on national calibration values derived from the Long-Term Pavement Performance (LTPP) database. However, these often fail to reflect Kentucky’s local conditions, materials, and practices. To address this issue, Kentucky Transportation Center (KTC) researchers completed local calibrations for several key transfer functions (rutting, reflective fatigue cracking, and roughness (IRI)) to improve the predictive accuracy of and reduce bias in pavement performance models developed for rehabilitation projects that involve placing …
Monazite And Xenotime U-Pb Geochronology And Thermometry Of The Blue Ridge And Inner Piedmont Of North Carolina, Nicholas E. Powell, J. Ryan Thigpen, Brandon M. Spencer, Arthur J. Merschat, David P. Moecher, Calvin A. Mako, Robert D. Hatcher, Harold H. Stowell, Andrew Kylander-Clark
Monazite And Xenotime U-Pb Geochronology And Thermometry Of The Blue Ridge And Inner Piedmont Of North Carolina, Nicholas E. Powell, J. Ryan Thigpen, Brandon M. Spencer, Arthur J. Merschat, David P. Moecher, Calvin A. Mako, Robert D. Hatcher, Harold H. Stowell, Andrew Kylander-Clark
Earth and Environmental Sciences Faculty Publications
The southern Appalachian orogen preserves a complex distribution of metamorphism and deformation varying in timing, magnitude, and spatial extent. These complexities give rise to disparate interpretations for southern Appalachian tectonic evolution, which complicates the testing and interpretation of tectonic models in this system. New monazite (Mnz) and xenotime (Xtm) laser ablation split stream (LASS) analyses alongside Mnz-Xtm thermometry in the orogenic core in the eastern Blue Ridge (EBR), western Inner Piedmont (WIP), and Cat Square terranes (CST) of North Carolina yield new constraints that define distinct pro- and retrograde metamorphic events. The EBR preserves two prograde thermal events: the Taconic …