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Full-Text Articles in Entire DC Network
Tricky Constituents- Issues With Leachate And Groundwater Constituents Of Concern, William Kennedy
Tricky Constituents- Issues With Leachate And Groundwater Constituents Of Concern, William Kennedy
World of Coal Ash Proceedings
Tricky Constituents – Issues with Leachate and Groundwater Constituents of Concern Authors Mr. William Kennedy - United States - Stantec Abstract Certain parameters in wastewater are more problematic to treat than others. Some constituents of concern such as arsenic and mercury are amenable to chemical precipitation, given the correct conditions. Others such as lithium, boron, and molybdenum are much more problematic – both in terms of cost and complexity. For waters from pump and treat systems that produce discharges to surface waters, it is important to correctly identify the appropriate discharge concentrations. Certain groundwater or leachate constituents of concern do …
Demolition Of The Navajo Generating Station, Sunshine Pryor, Pete Everds, Michael O'Hare
Demolition Of The Navajo Generating Station, Sunshine Pryor, Pete Everds, Michael O'Hare
World of Coal Ash Proceedings
Demolition of the Navajo Generating Station Authors Ms. Sunshine Pryor - United States - Tetra Tech EC, Inc. Mr. Pete Everds - United States - Tetra Tech EC, Inc. Mr. Michael O'Hare - United States - Tetra Tech EC, Inc. Abstract Operation of the Navajo Generating Station (NGS), a 2,250 MW coal-fired power plant, in Northern Arizona ceased in 2019 with demolition starting soon after and restoration will be completed in early 2024. Decommissioning, decontamination, demolition and restoration (DDDR) activities included closure of the CCR landfill, closure of evaporation ponds and solid waste landfill, removal and disposal of the overhead …
An Options Analysis –Final Waste Management, Breanne Kahnk, Todd Martin
An Options Analysis –Final Waste Management, Breanne Kahnk, Todd Martin
World of Coal Ash Proceedings
Final Waste Management Options Analysis Authors Ms. BreAnne Kahnk - United States - TRC Mr. Todd Martin - United States - TRC Abstract The recent trend of retiring coal-fired power plants in favor of gas-fired and renewable energy facilities has resulted in the need for a number of partially filled CCR landfills to be closed prematurely. In addition, forthcoming CCR rule changes designed to address legacy CCR material will be a driver for making additional closure decisions for many historical CCR landfills. The costs and labor burden associated with the long-term care of a prematurely closed or legacy CCR landfill …
Low Carbon Concrete- Fair And Rapid Assessment Of Slowly Reacting Cement Concrete, Rod Jones
Low Carbon Concrete- Fair And Rapid Assessment Of Slowly Reacting Cement Concrete, Rod Jones
World of Coal Ash Proceedings
Fairly Assessing Slowing Reacting Cement for Low Carbon Concrete Authors Prof. Rod Jones - United Kingdom - University of Dundee Abstract Responding and reducing the climate emergency concrete construction must play a significant role worldwide. The main of most carbon-limiting technologies is to reduce the Portland clinker content to increasingly high levels, typically with secondary cementitious materials such as fly ash. While it may be possible to design such mixes for a particular strength there are implications for durability. Durability tests are carried out at the standard age of 28 days, however, fly ash is a slowly reacting cement and …
Pathways To Maximise Stored Coal Combustion Products (Ccps)- Partnership Between Nsw Government And Ash Development Association Of Australia, Craig Heidrich, Warren South
Pathways To Maximise Stored Coal Combustion Products (Ccps)- Partnership Between Nsw Government And Ash Development Association Of Australia, Craig Heidrich, Warren South
World of Coal Ash Proceedings
Pathways to maximise stored Coal Combustion Products (CCPS): Partnership between NSW Government and Ash Development Association of Australia Authors Mr. Craig Heidrich - Australia - Ash Development Association of Australia Dr. Warren South - Australia - Valkoviki Pty Ltd Abstract ABSRACT: With a background of accelerating change in the electricity market within New South Wales, forecast closures of all coal fired power stations is planned to occur by 2045 -- the issue of supply and management of coal combustion products, being a by-product of the combustion of coal within a coal fired powers station, has been identified as an emerging …
Groundwater Corrective Action Implementation Issues, Jeremy Hurshman, Dennis Connair
Groundwater Corrective Action Implementation Issues, Jeremy Hurshman, Dennis Connair
World of Coal Ash Proceedings
Implementation Issues, Groundwater Corrective Action, Laramie River Station, Basin Electric Power Cooperative Authors Mr. Jeremy Hurshman - United States - AECOM Mr. Dennis Connair - United States - AECOM Abstract Groundwater monitoring of an ash pond and landfill complex at the subject site identified the presence of lithium and molybdenum at statistically significant levels (SSLs) above the site-specific groundwater protection standards (GWPSs). Groundwater impact in the sandstone aquifer was delineated and found to be limited to an area of less than 10 acres. An assessment of corrective measures (ACM) was conducted and a public meeting open to interested and affected …
Dewatering System Installation Methods For Ash Dewatering And Deep Depressurization, Christopher Gee, Paul Schmall, Shawn Coughlin, Christopher Jones
Dewatering System Installation Methods For Ash Dewatering And Deep Depressurization, Christopher Gee, Paul Schmall, Shawn Coughlin, Christopher Jones
World of Coal Ash Proceedings
Dewatering System Installation Methods for Ash Dewatering and Deep Depressurization- A Case Study Authors Mr. Christopher Gee - United States - Dominion Dr. Paul Schmall - United States - Keller Mr. Shawn Coughlin - United States - Keller Mr. Christopher Jones - United States - Haley & Aldrich Inc. Abstract Hydrogeologic conditions of this project require a multi-faceted approach to facilitate not only CCR dewatering but also deep depressurization of underlying highly permeable soils. Previous construction experienced significant and sustained groundwater inflows from beneath the ponded ash because the pond was built over the pre-existing river bed in braided stream …
Build To Last- Innovations For Water And Waste Water Conveyance Using Geosynthetic Cementitious Composite Mats (Gccms) Henry Miller Irrigation District - A Case History, Nathan Ivy
World of Coal Ash Proceedings
Emerging technologies for water conveyance and containment Authors Mr. Nathan Ivy - United States - Concrete Canvas Abstract GCCM’s represent the newest class of geosynthetics that can be used for water conveyance and containment applications. Since their initial introduction nearly 15 years ago, ASTM D8364-Standard Specification for Geosynthetic Cementitious Composite Mats (GCCM) Materials has been developed as the internationally recognized standard for testing and classifying GCCM as Type I, II or III. All products discussed herein meet or exceed all aspects of this standard – regardless of type. These products combine both a concrete – hard armor – top surface …
Reactive Transport Modeling Of Closure-In-Place With Intersecting Groundwater And Remedial Actions Part Ii, Bruce Hensel, Jason James, Olivia Paradis, Rachel Kelly
Reactive Transport Modeling Of Closure-In-Place With Intersecting Groundwater And Remedial Actions Part Ii, Bruce Hensel, Jason James, Olivia Paradis, Rachel Kelly
World of Coal Ash Proceedings
Reactive Transport Modeling of Closure-in-Place with Intersecting Groundwater and Remedial Actions: Part II, Results and Meaning Authors Mr. Bruce Hensel - United States - Electric Power Research Institute Dr. Jason James - United States - Exponent Dr. Olivia Paradis - United States - Exponent Dr. Rachel Kelly - United States - Exponent Dr. Walter McNab - United States - Exponent Abstract This EPRI research project was initiated to better understand two objectives: • How is mobility of inorganic constituents affected by the intersection of groundwater with coal combustion product ponds and landfills under varying geologic and redox conditions? • How …
It’S Here Now!, Mark Rokoff
It’S Here Now!, Mark Rokoff
World of Coal Ash Proceedings
IT’S HERE NOW! SUMMARIZING KEY ELEMENTS IN THE NEW LEGACY CCR SI RULE Authors Mr. Mark Rokoff - United States - Burns & McDonnell Abstract Subject to a formal consent decree, the EPA has agreed to issue the final Legacy CCR Surface Impoundment Rules (Legacy Rule) by May 6, 2024, following the recent publication of the proposed version of the same rule on May 18, 2023. The EPA is intent on completing the Legacy Rule further documenting their intent in the “Fall Unified Agenda” where it states that the rule will be finalized in April 2024. The Legacy Rule is …
Ash Recovery From Stock - Issues To Consider Based On Experience In France, Loic Danest
Ash Recovery From Stock - Issues To Consider Based On Experience In France, Loic Danest
World of Coal Ash Proceedings
Ash recovery from legacy stock – issues to consider based on experience in France Authors Mr. Loic Danest - France - Societe Surschiste Abstract In the 90s, Surschiste commissioned two drying facilities. The initial objective of these facilities was to reuse conditioned ashes for summer delivery when the power plant was stopped, creating a sustainable market. Over the years, as production decreased, the dryers were used for ashes from historic stockpiles. The main purpose of this presentation is to report on the methodology used to achieve consistency in the performance of dried ashes used as supplementary cementitious material. The first …
Paper_Successful Installation Of A Vertical Hydraulic Barrier At A Ccr Impoundment During In Place Closure, Jim Edwards, Sylvain Payne-Gagnon
Paper_Successful Installation Of A Vertical Hydraulic Barrier At A Ccr Impoundment During In Place Closure, Jim Edwards, Sylvain Payne-Gagnon
World of Coal Ash Proceedings
Successful Installation of a Vertical Hydraulic Barrier at a CCR Impoundment During In-Place Closure Authors Mr. Jim Edwards - United States - Forgen Mr. Sylvain Payne-Gagnon - United States - Forgen Abstract Forgen was contracted to install a cut-off wall as part of a Vertical Hydraulic Barrier System that will encircle the ash consolidation area for a CCR impoundment undergoing closure in-place. Forgen’s scope of work included mix design, installation of a test section, sampling of the hardened test section, and installation of the cutoff wall. The hardened backfill was required to achieves: • Hydraulic Conductivity ≤ 1 x 10-7 …
Life After Coal- Opportunities And Challenges At Decommissioned Coal-Fired Power Sites, Leslie Miller, Brian Owens, Stacey Vanbelleghem
Life After Coal- Opportunities And Challenges At Decommissioned Coal-Fired Power Sites, Leslie Miller, Brian Owens, Stacey Vanbelleghem
World of Coal Ash Proceedings
LIFE AFTER COAL? OPPORTUNITIES AND CHALLENGES AT DECOMMISSIONED COAL-FIRED POWER SITES Authors Ms. Leslie Miller - United States - WSP USA Mr. Brian Owens - United States - WSP USA Ms. Stacey VanBelleghem - United States - Latham & Watkins, LLP Abstract With substantial regulatory and public pressures, coal fired power plants are being retired and decommissioned at an accelerated rate. What does the future look like for these expansive sites? Many of these sites may be suited for conversion to natural gas or other renewable energy sources such as solar or battery storage by their current owners, but others …
Demonstrating Equivalency Of Closureturf, Tyler Schmidt
Demonstrating Equivalency Of Closureturf, Tyler Schmidt
World of Coal Ash Proceedings
DEMONSTRATING EQUIVALENCY OF CLOSURETURF AS A VIABLE ALTERNATIVE TO TRADITIONAL CCR FINAL COVER SYSTEMS Authors Mr. Tyler Schmidt - United States - Burns & McDonnell Abstract When designing final cover systems for the closure of CCR units, owners must select materials that meet regulatory criteria while weighing facility-specific needs and challenges. ClosureTurf, an artificial turf cover system component, is often a viable solution for managing a facility’s needs and challenges, from preconstruction (such as optimizing earthwork) to post-closure (such as managing a low-maintenance artificial erosion layer). However, obtaining approval from a state agency or to comply with the requirements in …
Securing Stockpile Reserves Of Coal Derived Fly Ash As A National Asset, Nigel Cooke
Securing Stockpile Reserves Of Coal Derived Fly Ash As A National Asset, Nigel Cooke
World of Coal Ash Proceedings
Soliciting Support from UK Government to Safeguard Legacy Stockpiles of Coal Derived Fly Ash (CDFA) Authors Dr. Nigel Cooke - United Kingdom - UK Quality Ash Association Abstract The global environment is under the spotlight and the need to reduce greenhouse gases is having a profound impact on just about every industrial sector. The construction industry is no exception. Coal derived fly ash (CDFA), has long been accepted within the UK construction sector for the unique properties it imparts to concrete and mortars and as a secondary aggregate for use in autoclaved aerated block manufacture and grouts. With a goal …
Dewatering Basics – Understanding The Challenges Of Dewatering, Christine Harris
Dewatering Basics – Understanding The Challenges Of Dewatering, Christine Harris
World of Coal Ash Proceedings
Dewatering Basics – Understanding the challenges of dewatering Authors Mrs. Christine Harris - United States - None Abstract The current EPA Coal Combustion Residuals Rule requires the removal of Free Liquids from coal ash. Free liquids are defined as all ‘‘liquids that readily separate from the solid portion of a waste under ambient temperature and pressure,’ regardless of whether the source of the liquids is from sluiced water or groundwater. 40 CFR 257.53. Consequently, the directive applies to both the freestanding liquid in the impoundment and to all separable porewater in the impoundment, whether the porewater was derived from sluiced …
Paper_Uniaxial Compressive Behavior Of “Solidified” Synthetic Lightweight Aggregates, Annika Han, Christopher Swan
Paper_Uniaxial Compressive Behavior Of “Solidified” Synthetic Lightweight Aggregates, Annika Han, Christopher Swan
World of Coal Ash Proceedings
This paper presents results from uniaxial compression tests on a synthetic lightweight aggregate (SLA) created from high carbon fly ash and mixed waste plastics. Since their invention in the late 1990’s, SLA has represented an innovative and potentially novel construction material created solely from the co-extrusion of these two, high volume, waste streams. This current effort involved testing specimens created as “solidified” SLA cylinders. Three types of cylindrical specimen were created from ‘loose’ SLA that existed at the following grain-size ranges: Coarse (between U.S. sieve No. 4 and No. 8 or between 2.36 to 4.75mm), Medium (between No. 8 and …
Age-Related Brain Atrophy And The Positive Effects Of Behavioral Enrichment In Middle-Aged Beagles., Jessica A Noche, Hamsanandini Radhakrishnan, Margo F. Ubele, Kathy Boaz, Jennifer L Mefford, Erin D Jones, Hollie Y Van Rooyen, Jessica A Perpich, Katie Mccarty, Beverly Meacham, Jeffrey R. Smiley, Stasia A Bembenek Bailey, László G Puskás, David K. Powell, Lorena Sordo, Michael J Phelan, Christopher M. Norris, Elizabeth Head, Craig E L Stark
Age-Related Brain Atrophy And The Positive Effects Of Behavioral Enrichment In Middle-Aged Beagles., Jessica A Noche, Hamsanandini Radhakrishnan, Margo F. Ubele, Kathy Boaz, Jennifer L Mefford, Erin D Jones, Hollie Y Van Rooyen, Jessica A Perpich, Katie Mccarty, Beverly Meacham, Jeffrey R. Smiley, Stasia A Bembenek Bailey, László G Puskás, David K. Powell, Lorena Sordo, Michael J Phelan, Christopher M. Norris, Elizabeth Head, Craig E L Stark
Neuroscience Faculty Publications
Aging dogs serve as a valuable preclinical model for Alzheimer's disease (AD) due to their natural age-related development of β-amyloid (Aβ) plaques, human-like metabolism, and large brains that are ideal for studying structural brain aging trajectories from serial neuroimaging. Here we examined the effects of chronic treatment with the calcineurin inhibitor (CNI) tacrolimus or the nuclear factor of activated T cells (NFAT)-inhibiting compound Q134R on age-related canine brain atrophy from a longitudinal study in middle-aged beagles (36 females, 7 males) undergoing behavioral enrichment. Annual MRI was analyzed using modern, automated techniques for region-of-interest-based and voxel-based volumetric assessments. We found that …
Application Of Data Science Techniques To Estimate Soluble Alkali Contribution From Fly Ashes For Determination Of Concrete Pore Solution Chemistry, Anol Mukhopadhyay
Application Of Data Science Techniques To Estimate Soluble Alkali Contribution From Fly Ashes For Determination Of Concrete Pore Solution Chemistry, Anol Mukhopadhyay
World of Coal Ash Proceedings
Application of Data Science Techniques to Estimate Soluble Alkali Contribution from Fly Ashes for Determination of Concrete Pore Solution Chemistry Authors Prof. Anol Mukhopadhyay - United States - Texas A&M University Abstract Traditionally, the available alkali (AA) tests following ASTM C 311 were primarily used to qualify Fly Ashes’ (FA) for suitability in Alkali Silica reaction (ASR) mitigation based on a 1.5% Na2Oeq AA limit. However, the test is currently being discontinued due to criticisms stemming from its lack of correlation with the ASR expansions and high operator/laboratory variability of test measurements. Therefore, a Bayesian machine learning model (ML) is …
Proposed Legacy Rule – Groundwater Compliance Nuances And Lessons Learned, Matthew Dagon, Peter Thibodeau
Proposed Legacy Rule – Groundwater Compliance Nuances And Lessons Learned, Matthew Dagon, Peter Thibodeau
World of Coal Ash Proceedings
Proposed CCR compliance timelines for CCR legacy surface impoundments and management units are compressed compared to 2015 CCR Rule deadlines. Site characterization, configuring monitoring well networks, and statistical analysis are critically important in identifying appropriate closure solutions. The regulated community and environmental consultants offered significant comments on the Proposed Rule, emphasizing that legacy sites are inherently complex and will require similar evaluation as 2015 Rule units. The industry is limited in terms of availability of quality consultants, drill rigs, and laboratories, creating constraints in meeting this compressed proposed timeline. Under the proposed Rule, there is less time for site characterization …
Use Of Visualization Software For Site Characterization, Kevin Cernik, Craig Schuettpelz, Shane Stockdill, Todd Stong
Use Of Visualization Software For Site Characterization, Kevin Cernik, Craig Schuettpelz, Shane Stockdill, Todd Stong
World of Coal Ash Proceedings
Use of Visualization Software as a Tool for Site Characterization Authors Mr. Kevin Cernik - United States - WSP USA Mr. Craig Schuettpelz - United States - WSP USA Mr. Shane Stockdill - United States - Rainbow Energy Center Mr. Todd Stong - United States - WSP USA Abstract Understanding site geology is critical to manage coal combustion residuals (CCR) units in compliance with the EPA’s CCR Rule, including siting of CCR units and groundwater monitoring wells to understanding suitable foundation conditions. At Rainbow Energy Center's (REC’s) Coal Creek Station, subsurface investigations have been conducted since the mid-1970’s to help …
Corrective Action Sustainability- Holistic Decision Support Tool, John Kondziolka, Ari Lewis, Bruce Hensel, Andrew Bittner
Corrective Action Sustainability- Holistic Decision Support Tool, John Kondziolka, Ari Lewis, Bruce Hensel, Andrew Bittner
World of Coal Ash Proceedings
Corrective Action Sustainability: Holistic Decision Support Tool Authors Mr. John Kondziolka - United States - Gradient Ms. Ari Lewis - United States - Gradient Mr. Bruce Hensel - United States - Electric Power Research Institute Mr. Andrew Bittner - United States - Gradient Abstract Selecting a corrective action approach to address groundwater protection standards at a coal combustion product (CCP) site requires balancing a variety of factors, including risk reduction, effectiveness, community impact, and cost. Several resources exist for conducting corrective action alternatives analyses, but these resources have not been used consistently to holistically evaluate risks and benefits inclusive of …
Proposed Ccr Legacy Rule – Making Sense From Chaos, Will Mattingly, Charla Barnes
Proposed Ccr Legacy Rule – Making Sense From Chaos, Will Mattingly, Charla Barnes
World of Coal Ash Proceedings
The proposed CCR Legacy Rule poses numerous challenges and constraints related to implementation and compliance. While the proposed aggressive compliance schedule is daunting, utility owners can set themselves up for success and reduce unwanted surprises by performing low risk, desktop level activities prior to the CCR Legacy Rule promulgation. In addition to the anticipated schedule constraints, there are other obvious challenges related to potential unit interpretations, beneficial use, closure standards, asset repurposing, availability of engineering consultants, certified drillers, laboratories, and qualified reviewers and the lack of consideration of risk. These challenges are known industry-wide and are dependent on requirements to …
Green Cement Llc, Russell Stapp
Green Cement Llc, Russell Stapp
World of Coal Ash Proceedings
The Future of CCR “Green Cement” Technology to Reduce CO2 and Provide High-Performance Products Authors Mr. Russell Stapp - United States - Ecomaterial Technologies Abstract ECOMaterial Technology is on the forefront of CCR Beneficial use, and its Green Cement (GCI) Division is specifically advanced in new CO2 reduction product development applications to create high volume uses of CCR to replace up to 60 percent of cement in standard cement formulations. PozzoSlag® product formulations will meet or exceed a Grade 100 and Grade 120 slag performance criteria evaluated under ASTM C989 specifications and compared to blast furnace slag performance. PozzoSlag® is …
5.5-Year Old Concrete Made With Spray Dryer Absorber Material, Benjamin Gallagher, Sundar Chithiraputhiran, Travis Collins
5.5-Year Old Concrete Made With Spray Dryer Absorber Material, Benjamin Gallagher, Sundar Chithiraputhiran, Travis Collins
World of Coal Ash Proceedings
Harvesting and Beneficial Use: Voluntary, Consensus Standard Developed by ASTM E50.03 Authors Mr. Benjamin Gallagher - United States - EPRI Ms. Abigail Calmes - United States - Verdantas Mr. William Petruzzi - United States - Verdantas Abstract ASTM is non-profit organization that develops voluntary, consensus-based standards. ASTM E50.03 subcommittee publishes standards related to beneficial use. The subcommittee’s eight active standards address harvesting of CCPs from landfills and impoundments, beneficial use of CCPs in mine reclamation and structural fills, and beneficial use of impacted lands. This session will provide an overview of active beneficial use standards. The recently published ASTM E3355-23 …
Coal Ash & The Public – Tell Your Story Before Someone Else Does!, Tim Hancock, Melissa Hedgecoth
Coal Ash & The Public – Tell Your Story Before Someone Else Does!, Tim Hancock, Melissa Hedgecoth
World of Coal Ash Proceedings
Coal Ash & the Public – Tell your story before someone else does! Authors Mr. Tim Hancock - United States - Stantec Ms. Melissa Hedgecoth - United States - Tennessee Valley Authority Abstract Nothing travels quite as fast as bad news, and our industry is a convenient target. Technical reports containing 99% good news can become grist for the mill due to a single line or paragraph that feeds a headline, particularly where human health is concerned. Despite data to the contrary, the industry continues to suffer from headlines like: Toxic coal ash: EPA says Alabama doesn't protect public or …
Legacy Rule Insights And Challenges, Arica Ditullio, Leigh Rounce
Legacy Rule Insights And Challenges, Arica Ditullio, Leigh Rounce
World of Coal Ash Proceedings
Legacy Rule Insights and Challenges Authors Mrs. Arica DiTullio - United States - GAI Consultants, Inc. Ms. Leigh Rounce - United States - GAI Consultants, Inc. Abstract This presentation will provide a summary of the proposed Legacy Impoundment Rule, which includes regulations for inactive impoundments and inactive landfill at inactive facilities. The discussion will include a review of the timeline for the Coal Combustion Residual (CCR) Rule and prudent definitions of terminology, such as Facility, Inactive Facility, Inactive Impoundment, Legacy Impoundment, Inactive Landfill, CCR Unit and CCR Management Unit. Summary and examples of Legacy CCR Surface Impoundment Applicability Documentation will …
Legacy Rule Implementation Deadlines, Lucas Carr, Eric Tlachac, Brian Hennings
Legacy Rule Implementation Deadlines, Lucas Carr, Eric Tlachac, Brian Hennings
World of Coal Ash Proceedings
Legacy Rule Implementation Deadlines: Examining the Agency vs. Industry Disconnect Authors Mr. Lucas Carr - United States - Ramboll Mr. Eric Tlachac - United States - Ramboll Mr. Brian Hennings - United States - Ramboll Abstract In May of 2023 the United States Environmental Protection Agency (USEPA) published a proposed draft expansion of the 2015 CCR Rule (40 C.F.R. Part 257, Subpart D) that would effectively remove the exemption of legacy CCR units. These units are broadly defined as CCR impoundments and landfills located at power stations that had closed prior to October 15, 2015, inactive landfills at operating power …
Implementing The Final Ccr Legacy Rule, Robert Glazier, Martha Thomsen, John Seymour, Victor Modeer
Implementing The Final Ccr Legacy Rule, Robert Glazier, Martha Thomsen, John Seymour, Victor Modeer
World of Coal Ash Proceedings
Implementing the Final CCR Legacy Rule Authors Mr. Robert Glazier - United States - Geosyntec Consultants, Inc. Mrs. Martha Thomsen - United States - Baker Botts LLP Mr. John Seymour - United States - Geosyntec Consultants, Inc. Mr. Victor Modeer - United States - Vistra Abstract Inactive surface impoundments at inactive power stations (legacy units) were exempt from the 2015 Federal Coal Combustion Residuals (CCR) Rule. In August 2018, the U.S. Court of Appeals for the D.C. District vacated and remanded that exemption back to the U.S. Environmental Protection Agency (USEPA). On October 14, 2020, USEPA published an Advance Notice …
Impoundment Closure Using Discrete In-Situ Solidification Site Update, Tim Silar, John Magee
Impoundment Closure Using Discrete In-Situ Solidification Site Update, Tim Silar, John Magee
World of Coal Ash Proceedings
Impoundment Closure Using Discrete In-situ Solidification – Site Update Authors Mr. Tim Silar - United States - Silar Services Mr. John Magee - United States - Silar Services Abstract In accordance with USEPA guidance, the protection of groundwater and/or surface water is driving CCP impoundment closures. This presentation will describe an impoundment closure where discrete in-situ solidification is being implemented to achieve USEPA’s requirement of controlling the vertical and horizontal movement of groundwater. The technology, which has gained regulatory approval, will hydraulically isolate the ash from the groundwater by constructing a hydraulic barrier at the bottom of the impoundment using …