{"id":1387,"date":"2023-09-28T14:08:39","date_gmt":"2023-09-28T14:08:39","guid":{"rendered":"https:\/\/www.trccompanies.com\/insights\/understanding-piper-diagrams-applications-and-limitations-with-coal-combustion-residuals\/"},"modified":"2025-02-18T12:21:51","modified_gmt":"2025-02-18T12:21:51","slug":"understanding-piper-diagrams-applications-and-limitations-with-coal-combustion-residuals","status":"publish","type":"news-and-insights","link":"https:\/\/www.trccompanies.com\/fr\/insights\/understanding-piper-diagrams-applications-and-limitations-with-coal-combustion-residuals\/","title":{"rendered":"Understanding Piper Diagrams: Applications and Limitations with Coal Combustion Residuals"},"content":{"rendered":"<!-- Start Block: acf\/wysiwyg -->\n\n<section class=\"wysiwyg section-padding bg-white\">\n    <div class=\"container-fluid\">\n        \n        <div class=\"row\">\n                            <div class=\"col-lg-8 columns js-animated-content animated-content\">\n                                        <div class=\"wysiwyg__columns-text-top\">\n                        <div class=\"option-links\">\n                            <ul>\n                                                                                                        <li>\n                                        <a href=\"https:\/\/www.trccompanies.com\/services\/remediation-and-materials-management\/coal-ash-management\/\" \n                                        target=\"_self\">\n                                        Coal Ash Management                                        <\/a>\n                                    <\/li>\n                                                                                                <\/ul>\n                        <\/div>\n                    <\/div>\n                                        <p>Piper Diagrams are a powerful data visualization tool, that have a variety of useful applications for electric generating facilities with Coal Combustion Residual (CCR) units, including developing Conceptual Site Models (CSM) and supporting alternative source demonstrations (ASD). Learn more about approaches to overcome the recognized limitations of Piper Diagrams and how to make the most of this valuable technique.<\/p>\n                <\/div>\n                <div class=\"col-lg-4 columns js-animated-content animated-content\">\n                                        <div class=\"wysiwyg__links js-animated-content animated-content\">\n                        <div class=\"wysiwyg__links__top \">\n                                                        <h4>Related Services<\/h4>\n                                                                                    <ul class=\"js-animated-content animated-content\">\n                                                                <li><a href=\"https:\/\/www.trccompanies.com\/services\/remediation-and-materials-management\/coal-ash-management\/\" target=\"_self\">Coal Ash Management<\/a><\/li>\n                                                            <\/ul>\n                                                    <\/div>\n                                                                                                            <div class=\"wysiwyg__links__bottom\">\n                                    <a href=\"https:\/\/www.trccompanies.com\/services\" target=\"_self\">View All Services<\/a>\n                                <\/div>\n                                                                                                <\/div>\n                <\/div>\n                    <\/div>\n\n            <\/div>\n<\/section>\n<!-- End Block: acf\/wysiwyg -->\n\n<!-- Start Block: acf\/innerpage-half-text-half-image -->\n\n<section class=\"half-and-half flex-row section-padding image-block-left bg-white text-column-one image-size-cover\">\n    <div class=\"half-and-half-image\">\n        <div class=\"half-and-half-image__wrap\">\n                                                <img decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/www.trccompanies.com\/wp-content\/uploads\/2023\/09\/GettyImages-2121283783-a-1024x576.jpg\" class=\"object-fit\" alt=\"GettyImages-2121283783-a\" srcset=\"https:\/\/www.trccompanies.com\/wp-content\/uploads\/2023\/09\/GettyImages-2121283783-a-1024x576.jpg 1024w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2023\/09\/GettyImages-2121283783-a-300x169.jpg 300w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2023\/09\/GettyImages-2121283783-a-768x432.jpg 768w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2023\/09\/GettyImages-2121283783-a-1536x864.jpg 1536w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2023\/09\/GettyImages-2121283783-a-1067x600.jpg 1067w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2023\/09\/GettyImages-2121283783-a.jpg 2000w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/>                                    <\/div>\n    <\/div>\n    \n    <div class=\"half-and-half-text\">\n        <div class=\"half-and-half-text__wrapper js-animated-content animated-content\">\n                                        <h2>CCR Rule Groundwater Monitoring Requirements<\/h2>\n<p>The Resource Conservation and Recovery Act (RCRA), enacted in 1976, addressed the management of hazardous waste and prescribes the means and methods to monitor hazardous (Subtitle C) and non-hazardous (Subtitle D) waste facilities, particularly landfills and storage sites, to assess potential contamination and protect water resources. The performance of groundwater monitoring under RCRA and subsequent amendments is required to demonstrate that human health and the environment are protected. Groundwater monitoring is an integral component of compliance under RCRA and the EPA\u2019s 2015\u00a0<em>Hazardous and Solid Waste Management System: Disposal of Coal Combustion Residuals from Electric Utilities; Final Rule (40 CFR Part 257, the \u201cCCR Rule\u201d)\u00a0<\/em>and the proposed<em>\u00a0Legacy CCR Surface Impoundments\u00a0<\/em>rule (proposed rule) to amend the CCR Rule under \u00a7\u00a0257.94.<\/p>\n<p>Under the CCR Rule, detection monitoring is one of the initial requirements, where a facility must monitor groundwater for statistically significant increases (SSIs) in the concentrations of the seven detection monitoring constituents (the Appendix III) above background concentrations in groundwater monitoring wells at a CCR unit, a legacy impoundment or CCR Management Unit (CCRMU) under the proposed rule. If there is a potential statistically significant increase (SSI), under \u00a7\u00a0257.94(e)(2), the facility must either initiate an assessment monitoring program under \u00a7\u00a0297.95 or perform an alternate source demonstration (ASD) to establish whether the potential SSI is due to either another groundwater source or an error in sampling, analysis, statistical evaluation, or natural variation in groundwater quality. The use of the Piper Diagram is a useful line of evidence (either \u201ckey\u201d or \u201csupporting\u201d) when used in concert with other lines of evidence.<\/p>\n                    <\/div>\n    <\/div>\n<\/section>\n<!-- End Block: acf\/innerpage-half-text-half-image -->\n\n<!-- Start Block: acf\/wysiwyg -->\n\n<section class=\"wysiwyg section-padding bg-light-gradient\">\n    <div class=\"container-fluid\">\n                    <div class=\"wysiwyg__wrapper\">\n        \n        <div class=\"row\">\n                        <div class=\"col-lg-12\">\n                                                                                \n                                                <\/div>\n\n                            <div class=\"col-lg-12 js-animated-content animated-content\">\n                    <h2>The Role of the Piper Diagram<\/h2>\n<p>The Piper Diagram\u2013a graphical representation that allows geoscientists to analyze and interpret groundwater chemistry data\u2014is a useful line of evidence (either \u201ckey\u201d or \u201csupporting\u201d) for evaluating potential releases of CCR constituents when used in concert with other lines of evidence.<\/p>\n<p>Laying out a framework to organize site characteristic information that helps with understanding fate and transport mechanisms at the early stages of a monitoring program is important to readily evaluate SSIs and alternate sources, if necessary. This involves developing a Conceptual Site Model (CSM), which is a key, base component in a CCR Rule compliance program that serves as a foundation for further investigation, analysis and decision-making that may arise throughout the groundwater monitoring program. Piper Diagrams are an invaluable tool in constructing the CSM by examining the chemical composition and variations in water samples and have historically been widely used by hydrogeologists and geochemists to analyze mixing of groundwater plumes.<\/p>\n                <\/div>\n                                <\/div>\n\n                    <\/div>\n            <\/div>\n<\/section>\n<!-- End Block: acf\/wysiwyg -->\n\n<!-- Start Block: acf\/innerpage-half-text-half-image -->\n\n<section class=\"half-and-half flex-row section-padding image-block-right flex-opposite bg-white text-column-one image-size-cover\">\n    <div class=\"half-and-half-image\">\n        <div class=\"half-and-half-image__wrap\">\n                                                <img decoding=\"async\" width=\"1024\" height=\"682\" src=\"https:\/\/www.trccompanies.com\/wp-content\/uploads\/2023\/09\/GettyImages-1188858439-a-1024x682.jpg\" class=\"object-fit\" alt=\"GettyImages-1188858439-a\" srcset=\"https:\/\/www.trccompanies.com\/wp-content\/uploads\/2023\/09\/GettyImages-1188858439-a-1024x682.jpg 1024w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2023\/09\/GettyImages-1188858439-a-300x200.jpg 300w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2023\/09\/GettyImages-1188858439-a-768x512.jpg 768w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2023\/09\/GettyImages-1188858439-a-1536x1024.jpg 1536w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2023\/09\/GettyImages-1188858439-a-900x600.jpg 900w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2023\/09\/GettyImages-1188858439-a.jpg 2000w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/>                                    <\/div>\n    <\/div>\n    \n    <div class=\"half-and-half-text\">\n        <div class=\"half-and-half-text__wrapper js-animated-content animated-content\">\n                                        <h2>Limitations and New Approaches<\/h2>\n<p>Although Piper Diagrams are very useful, they are subject to limitations. As with any visualization tool, the Piper Diagram presents data in very specific ways which, if not performed properly, can lead to misapplication and misinterpretation of the visual presentation. In addition to simplified representation, other limitations include the use of ratios rather than concentrations; limited modeling of geochemical processes; data clustering; similarities in iconic concentrations from different sources; and data set considerations.<\/p>\n<p>Piper Diagrams are a powerful data visualization tool, but with recognized limitations, that are useful for a variety of applications for electric generating facility with CCR units, including developing CSMs and supporting ASDs. Fortunately, these limitations can often be successfully addressed through the use of additional focused data assessments and geochemical modeling. While Piper Diagrams are not necessarily a stand-alone line of reasoning for a successful ASD, they are a viable technique to evaluate and visualize data in combination with additional lines of evidence demonstrating an alternate source. To further explore the utility and relevance of using Piper Diagrams as a line of reasoning for evaluating potential releases of CCR constituents from CCR units, and to learn more about suggested approaches to overcome these recognized limitations, download our White Paper below or contact us to discuss your specific needs.<\/p>\n                    <\/div>\n    <\/div>\n<\/section>\n<!-- End Block: acf\/innerpage-half-text-half-image -->\n\n<!-- Start Block: acf\/wysiwyg -->\n\n<section class=\"wysiwyg section-padding bg-white-fog\">\n    <div class=\"container-fluid\">\n        \n        <div class=\"row\">\n                        <div class=\"col-lg-12\">\n                                                                                \n                                                <\/div>\n\n                                                                        <div class=\"col-lg-4 \">\n                                                        <div class=\"js-animated-content animated-content\">\n                                <h3>Understanding Piper Diagrams: Applications and Limitations with Coal Combustion Residuals<\/h3>\n                            <\/div>\n                        <\/div>\n                                                                                <div class=\"col-lg-4 columns\">\n                                                        <div class=\"js-animated-content animated-content\">\n                                <p><iframe style=\"border: 1px; border-color: black; vertical-align: top;\" src=\"https:\/\/www2.trccompanies.com\/l\/911132\/2023-09-28\/csght\" width=\"500\" height=\"550\" frameborder=\"1\" scrolling=\"no\" data-tc-id=\"w-0.05034451418676489\"><\/iframe><\/p>\n                            <\/div>\n                        <\/div>\n                                                                                <div class=\"col-lg-4 columns\">\n                                                        <div class=\"js-animated-content animated-content\">\n                                <div class=\"content-image\"><img decoding=\"async\" class=\"size-large wp-image-15635 aligncenter\" src=\"https:\/\/www.trccompanies.com\/wp-content\/uploads\/2023\/09\/0631651b-piper-diagrams-white-paper-786x1024.jpg\" alt=\"\" width=\"786\" height=\"1024\" srcset=\"https:\/\/www.trccompanies.com\/wp-content\/uploads\/2023\/09\/0631651b-piper-diagrams-white-paper-786x1024.jpg 786w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2023\/09\/0631651b-piper-diagrams-white-paper-230x300.jpg 230w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2023\/09\/0631651b-piper-diagrams-white-paper-768x1001.jpg 768w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2023\/09\/0631651b-piper-diagrams-white-paper-1179x1536.jpg 1179w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2023\/09\/0631651b-piper-diagrams-white-paper-461x600.jpg 461w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2023\/09\/0631651b-piper-diagrams-white-paper-384x500.jpg 384w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2023\/09\/0631651b-piper-diagrams-white-paper.jpg 1535w\" sizes=\"(max-width: 786px) 100vw, 786px\" ><\/div>\n                            <\/div>\n                        <\/div>\n                                                                    <\/div>\n\n            <\/div>\n<\/section>\n<!-- End Block: acf\/wysiwyg -->\n\n<!-- Start Block: acf\/innerpage-cta-bar -->\n<section class=\"global-cta innerpage-cta cta-purple\">\n    <div class=\"container-fluid\">\n        <div class=\"global-cta-wrapper  \">\n                                            <h2>S&rsquo;adapter au <br>changement<\/h2>\n                                <div class=\"global-cta-image\">\n                    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"316.566\" height=\"369\" viewBox=\"0 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plus<\/a>\n                                            <\/div>\n                                        <\/div>\n                                    <\/div>\n                                <\/div>\n                                                                <div class=\"image-cards-slider-item fx-slide\">\n                                    <div class=\"image-card\">\n                                        <div class=\"image-card__image\">\n                                            <img decoding=\"async\" width=\"700\" height=\"467\" src=\"https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/10\/coal-power-plant-factory-643293310-edit1-1-scaled-min.jpg\" class=\"attachment-homepage-image-card size-homepage-image-card\" alt=\"coal-power-plant-factory-643293310-edit1-1-scaled-min\" srcset=\"https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/10\/coal-power-plant-factory-643293310-edit1-1-scaled-min.jpg 2560w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/10\/coal-power-plant-factory-643293310-edit1-1-scaled-min-300x200.jpg 300w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/10\/coal-power-plant-factory-643293310-edit1-1-scaled-min-1024x683.jpg 1024w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/10\/coal-power-plant-factory-643293310-edit1-1-scaled-min-768x512.jpg 768w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/10\/coal-power-plant-factory-643293310-edit1-1-scaled-min-1536x1024.jpg 1536w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/10\/coal-power-plant-factory-643293310-edit1-1-scaled-min-2048x1366.jpg 2048w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/10\/coal-power-plant-factory-643293310-edit1-1-scaled-min-900x600.jpg 900w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/>                                        <\/div>\n                                        <div class=\"image-card__info\">\n              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class=\"image-card__info__bottom\">\n                                                <a href=\"https:\/\/www.trccompanies.com\/fr\/insights\/ancienne-regle-du-ccr-planifier-a-lavance-pour-la-surveillance-des-ccmr\/\" class=\"image-card__link\">En savoir plus<\/a>\n                                            <\/div>\n                                        <\/div>\n                                    <\/div>\n                                <\/div>\n                                                                <div class=\"image-cards-slider-item fx-slide\">\n                                    <div class=\"image-card\">\n                                        <div class=\"image-card__image\">\n                                            <img decoding=\"async\" width=\"700\" height=\"394\" src=\"https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/b8f687b1-coal-power-plant-sunset-700x394.webp\" class=\"attachment-homepage-image-card size-homepage-image-card\" alt=\"b8f687b1-coal-power-plant-sunset\" srcset=\"https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/b8f687b1-coal-power-plant-sunset-700x394.webp 700w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/b8f687b1-coal-power-plant-sunset-300x169.webp 300w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/b8f687b1-coal-power-plant-sunset-1024x576.webp 1024w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/b8f687b1-coal-power-plant-sunset-768x432.webp 768w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/b8f687b1-coal-power-plant-sunset-1536x864.webp 1536w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/b8f687b1-coal-power-plant-sunset-1067x600.webp 1067w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/b8f687b1-coal-power-plant-sunset-889x500.webp 889w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/b8f687b1-coal-power-plant-sunset.webp 1792w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/>                                        <\/div>\n                                        <div class=\"image-card__info\">\n                                            <div class=\"image-card__info__top\">\n                                                <a href=\"https:\/\/www.trccompanies.com\/fr\/news-and-insights-category\/white-papers\/\" class=\"image-card__category\">White Papers \/ Reports<\/a>                                                <h3>Understanding Piper Diagrams: Applications and Limitations with Coal Combustion Residuals<\/h3>\n                                                <h4 class=\"hidden-md-down\">septembre 28, 2023<\/h4>\n                                                <p class=\"image-card__description\">Learn more about approaches to overcome the recognized limitations of Piper Diagrams and how to make the most of this valuable technique.<\/p>\n                                            <\/div>\n                                            <div class=\"image-card__info__bottom\">\n                                                <a href=\"https:\/\/www.trccompanies.com\/fr\/insights\/understanding-piper-diagrams-applications-and-limitations-with-coal-combustion-residuals\/\" class=\"image-card__link\">En savoir plus<\/a>\n                                            <\/div>\n                                        <\/div>\n                                    <\/div>\n                                <\/div>\n                                                                <div class=\"image-cards-slider-item fx-slide\">\n                                    <div class=\"image-card\">\n                                        <div class=\"image-card__image\">\n                                            <img decoding=\"async\" width=\"700\" height=\"467\" src=\"https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/98bf3ae3-coalash-2015-700x467.jpg\" class=\"attachment-homepage-image-card size-homepage-image-card\" alt=\"98bf3ae3-coalash-2015\" srcset=\"https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/98bf3ae3-coalash-2015-700x467.jpg 700w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/98bf3ae3-coalash-2015-300x200.jpg 300w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/98bf3ae3-coalash-2015-1024x682.jpg 1024w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/98bf3ae3-coalash-2015-768x512.jpg 768w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/98bf3ae3-coalash-2015-1536x1024.jpg 1536w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/98bf3ae3-coalash-2015-900x600.jpg 900w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/98bf3ae3-coalash-2015-750x500.jpg 750w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/98bf3ae3-coalash-2015.jpg 2000w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/>                                        <\/div>\n                                        <div class=\"image-card__info\">\n                                            <div class=\"image-card__info__top\">\n                                                <a href=\"https:\/\/www.trccompanies.com\/fr\/news-and-insights-category\/news\/\" class=\"image-card__category\">News<\/a>                                                <h3>Proposed Coal Combustion Residuals Legacy CCR Surface Impoundments Rule &#8211; Status of Public Comments<\/h3>\n                                                <h4 class=\"hidden-md-down\">juillet 31, 2023<\/h4>\n                                                <p class=\"image-card__description\">TRC has submitted public comments related to EPA\u2019s proposed compliance timeline and schedule.<\/p>\n                                            <\/div>\n                                            <div class=\"image-card__info__bottom\">\n                                                <a href=\"https:\/\/www.trccompanies.com\/fr\/insights\/proposed-coal-combustion-residuals-legacy-ccr-surface-impoundments-rule-status-of-public-comments\/\" class=\"image-card__link\">En savoir plus<\/a>\n                                            <\/div>\n                                        <\/div>\n                                    <\/div>\n                                <\/div>\n                                                                <div class=\"image-cards-slider-item fx-slide\">\n                                    <div class=\"image-card\">\n                                        <div class=\"image-card__image\">\n                                            <img decoding=\"async\" width=\"700\" height=\"394\" src=\"https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/268f59fe-power-plant-from-coal-993346578-700x394.webp\" class=\"attachment-homepage-image-card size-homepage-image-card\" alt=\"268f59fe-power-plant-from-coal-993346578\" srcset=\"https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/268f59fe-power-plant-from-coal-993346578-700x394.webp 700w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/268f59fe-power-plant-from-coal-993346578-300x169.webp 300w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/268f59fe-power-plant-from-coal-993346578-1024x576.webp 1024w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/268f59fe-power-plant-from-coal-993346578-768x432.webp 768w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/268f59fe-power-plant-from-coal-993346578-1536x864.webp 1536w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/268f59fe-power-plant-from-coal-993346578-1067x600.webp 1067w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/268f59fe-power-plant-from-coal-993346578-889x500.webp 889w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/268f59fe-power-plant-from-coal-993346578.webp 1792w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/>                                        <\/div>\n                                        <div class=\"image-card__info\">\n                                            <div class=\"image-card__info__top\">\n                                                <a href=\"https:\/\/www.trccompanies.com\/fr\/news-and-insights-category\/white-papers\/\" class=\"image-card__category\">White Papers \/ Reports<\/a>                                                <h3>Summary of Proposed Coal Combustion Residuals Legacy CCR Surface Impoundments Rule<\/h3>\n                                                <h4 class=\"hidden-md-down\">juin 8, 2023<\/h4>\n                                                <p class=\"image-card__description\">TRC\u2019s extensive background in CCR compliance support under the current CCR rule helps our clients get in front of these new regulations.<\/p>\n                                            <\/div>\n                                            <div class=\"image-card__info__bottom\">\n                                                <a href=\"https:\/\/www.trccompanies.com\/fr\/insights\/summary-of-proposed-coal-combustion-residual-legacy-ccr-surface-impoundment-rule\/\" class=\"image-card__link\">En savoir plus<\/a>\n                                            <\/div>\n                                        <\/div>\n                                    <\/div>\n                                <\/div>\n                                                                <div class=\"image-cards-slider-item fx-slide\">\n                                    <div class=\"image-card\">\n                                        <div class=\"image-card__image\">\n                                            <img decoding=\"async\" width=\"700\" height=\"394\" src=\"https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/a1a97d18-brand-new-coal-power-plant-489110302-700x394.jpg\" class=\"attachment-homepage-image-card size-homepage-image-card\" alt=\"a1a97d18-brand-new-coal-power-plant-489110302\" srcset=\"https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/a1a97d18-brand-new-coal-power-plant-489110302-700x394.jpg 700w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/a1a97d18-brand-new-coal-power-plant-489110302-300x169.jpg 300w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/a1a97d18-brand-new-coal-power-plant-489110302-1024x576.jpg 1024w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/a1a97d18-brand-new-coal-power-plant-489110302-768x432.jpg 768w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/a1a97d18-brand-new-coal-power-plant-489110302-1536x864.jpg 1536w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/a1a97d18-brand-new-coal-power-plant-489110302-1067x600.jpg 1067w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/a1a97d18-brand-new-coal-power-plant-489110302-889x500.jpg 889w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/a1a97d18-brand-new-coal-power-plant-489110302.jpg 2000w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/>                                        <\/div>\n                                        <div class=\"image-card__info\">\n                                            <div class=\"image-card__info__top\">\n                                                <a href=\"https:\/\/www.trccompanies.com\/fr\/news-and-insights-category\/insights\/\" class=\"image-card__category\">Insights<\/a>                                                <h3>EPA Provides New Coal Combustion Residual Expectations<\/h3>\n                                                <h4 class=\"hidden-md-down\">octobre 6, 2022<\/h4>\n                                                <p class=\"image-card__description\">The Environmental Protection Agency (EPA) highlighted new Coal Combustion Residual (CCR) compliance expectations.<\/p>\n                                            <\/div>\n                                            <div class=\"image-card__info__bottom\">\n                                                <a href=\"https:\/\/www.trccompanies.com\/fr\/insights\/epa-provides-new-coal-combustion-residual-expectations\/\" class=\"image-card__link\">En savoir plus<\/a>\n                                            <\/div>\n                                        <\/div>\n                                    <\/div>\n                                <\/div>\n                                                                <div class=\"image-cards-slider-item fx-slide\">\n                                    <div class=\"image-card\">\n                                        <div class=\"image-card__image\">\n                                            <img decoding=\"async\" width=\"700\" height=\"466\" src=\"https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/10\/d9660fc8-trc-coal-ash-management-700x466.webp\" class=\"attachment-homepage-image-card size-homepage-image-card\" alt=\"trc-coal-ash-management\" srcset=\"https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/10\/d9660fc8-trc-coal-ash-management-700x466.webp 700w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/10\/d9660fc8-trc-coal-ash-management-300x200.webp 300w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/10\/d9660fc8-trc-coal-ash-management-1024x682.webp 1024w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/10\/d9660fc8-trc-coal-ash-management-768x512.webp 768w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/10\/d9660fc8-trc-coal-ash-management-1536x1023.webp 1536w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/10\/d9660fc8-trc-coal-ash-management-901x600.webp 901w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/10\/d9660fc8-trc-coal-ash-management-750x500.webp 750w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/10\/d9660fc8-trc-coal-ash-management.webp 1792w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/>                                        <\/div>\n                                        <div class=\"image-card__info\">\n                                            <div class=\"image-card__info__top\">\n                                                <a href=\"https:\/\/www.trccompanies.com\/fr\/news-and-insights-category\/regulatory-updates\/\" class=\"image-card__category\">Regulatory Updates<\/a>                                                <h3>EPA Coal Ash Compliance Expectations Updated<\/h3>\n                                                <h4 class=\"hidden-md-down\">mars 28, 2022<\/h4>\n                                                <p class=\"image-card__description\">New EPA Communications highlight new Coal Combustion Residual compliance expectations, a shift from the current program.<\/p>\n                                            <\/div>\n                                            <div class=\"image-card__info__bottom\">\n                                                <a href=\"https:\/\/www.trccompanies.com\/fr\/insights\/epa-issues-coal-ash-rule-interpretations-setting-new-compliance-expectations\/\" class=\"image-card__link\">En savoir plus<\/a>\n                                            <\/div>\n                                        <\/div>\n                                    <\/div>\n                                <\/div>\n                                                                <div class=\"image-cards-slider-item fx-slide\">\n                                    <div class=\"image-card\">\n                                        <div class=\"image-card__image\">\n                                            <img decoding=\"async\" width=\"700\" height=\"394\" src=\"https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/67ac0246-ccr-groundwater-compliance-southeast-700x394.webp\" class=\"attachment-homepage-image-card size-homepage-image-card\" alt=\"67ac0246-ccr-groundwater-compliance-southeast\" srcset=\"https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/67ac0246-ccr-groundwater-compliance-southeast-700x394.webp 700w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/67ac0246-ccr-groundwater-compliance-southeast-300x169.webp 300w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/67ac0246-ccr-groundwater-compliance-southeast-1024x576.webp 1024w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/67ac0246-ccr-groundwater-compliance-southeast-768x432.webp 768w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/67ac0246-ccr-groundwater-compliance-southeast-1536x864.webp 1536w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/67ac0246-ccr-groundwater-compliance-southeast-1067x600.webp 1067w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/67ac0246-ccr-groundwater-compliance-southeast-889x500.webp 889w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/67ac0246-ccr-groundwater-compliance-southeast.webp 1792w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/>                                        <\/div>\n                                        <div class=\"image-card__info\">\n                                            <div class=\"image-card__info__top\">\n                                                <a href=\"https:\/\/www.trccompanies.com\/fr\/news-and-insights-category\/insights\/\" class=\"image-card__category\">Insights<\/a>                                                <h3>CCR Removal and Its Effects on Soil and Groundwater Geochemistry<\/h3>\n                                                <h4 class=\"hidden-md-down\">octobre 25, 2021<\/h4>\n                                                <p class=\"image-card__description\">Many utilities are implementing corrective action at coal combustion residual (CCR) surface impoundments under Federal or State CCR Regulations, with implications for groundwater protection standards. <\/p>\n                                            <\/div>\n                                            <div class=\"image-card__info__bottom\">\n                                                <a href=\"https:\/\/www.trccompanies.com\/fr\/insights\/ccr-removal-soil-groundwater\/\" class=\"image-card__link\">En savoir plus<\/a>\n                                            <\/div>\n                                        <\/div>\n                                    <\/div>\n                                <\/div>\n                                                                <div class=\"image-cards-slider-item fx-slide\">\n                                    <div class=\"image-card\">\n                                        <div class=\"image-card__image\">\n                                            <img decoding=\"async\" width=\"700\" height=\"467\" src=\"https:\/\/www.trccompanies.com\/wp-content\/uploads\/2021\/07\/GettyImages-1253487317-700x467.jpg\" class=\"attachment-homepage-image-card size-homepage-image-card\" alt=\"GettyImages-1253487317\" srcset=\"https:\/\/www.trccompanies.com\/wp-content\/uploads\/2021\/07\/GettyImages-1253487317-700x467.jpg 700w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2021\/07\/GettyImages-1253487317-300x200.jpg 300w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2021\/07\/GettyImages-1253487317-1024x683.jpg 1024w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2021\/07\/GettyImages-1253487317-768x512.jpg 768w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2021\/07\/GettyImages-1253487317-1536x1024.jpg 1536w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2021\/07\/GettyImages-1253487317-2048x1365.jpg 2048w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2021\/07\/GettyImages-1253487317-900x600.jpg 900w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2021\/07\/GettyImages-1253487317-750x500.jpg 750w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/>                                        <\/div>\n                                        <div class=\"image-card__info\">\n                                            <div class=\"image-card__info__top\">\n                                                <a href=\"https:\/\/www.trccompanies.com\/fr\/news-and-insights-category\/insights\/\" class=\"image-card__category\">Insights<\/a>                                                <h3>Consider a CCR Audit as the Assessment &#038; Plan Deadline Approaches<\/h3>\n                                                <h4 class=\"hidden-md-down\">juillet 8, 2021<\/h4>\n                                                <p class=\"image-card__description\">With the upcoming five-year periodic assessment and plan deadlines rapidly approaching for landfills and surface impoundments, power generators subject to the CCR Rule should also consider audits to ensure their facility records and external-facing web sites are complete and documents are up-to-date.<\/p>\n                                            <\/div>\n                                            <div class=\"image-card__info__bottom\">\n                                                <a href=\"https:\/\/www.trccompanies.com\/fr\/insights\/the-five-year-periodic-ccr-plan-updates-a-good-time-to-do-an-audit\/\" class=\"image-card__link\">En savoir plus<\/a>\n                                            <\/div>\n                                        <\/div>\n                                    <\/div>\n                                <\/div>\n                                                                <div class=\"image-cards-slider-item fx-slide\">\n                                    <div class=\"image-card\">\n                                        <div class=\"image-card__image\">\n                                            <img decoding=\"async\" width=\"668\" height=\"500\" src=\"https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/GettyImages-1492439239-668x500.jpg\" class=\"attachment-homepage-image-card size-homepage-image-card\" alt=\"GettyImages-1492439239\" srcset=\"https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/GettyImages-1492439239-668x500.jpg 668w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/GettyImages-1492439239-300x225.jpg 300w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/GettyImages-1492439239-1024x767.jpg 1024w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/GettyImages-1492439239-768x575.jpg 768w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/GettyImages-1492439239-1536x1150.jpg 1536w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/GettyImages-1492439239-801x600.jpg 801w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/GettyImages-1492439239.jpg 2000w\" sizes=\"(max-width: 668px) 100vw, 668px\" \/>                                        <\/div>\n                                        <div class=\"image-card__info\">\n                                            <div class=\"image-card__info__top\">\n                                                <a href=\"https:\/\/www.trccompanies.com\/fr\/news-and-insights-category\/insights\/\" class=\"image-card__category\">Insights<\/a>                                                <h3>TRC In Manchester \u2013 1 Year Later<\/h3>\n                                                <h4 class=\"hidden-md-down\">janvier 25, 2021<\/h4>\n                                                <p class=\"image-card__description\">In January 2020 we opened our second UK office in Manchester. One year later, we reflect on our first year of business, a year that presented the world with unprecedented challenges.<\/p>\n                                            <\/div>\n                                            <div class=\"image-card__info__bottom\">\n                                                <a href=\"https:\/\/www.trccompanies.com\/fr\/insights\/trc-in-manchester-1-year-later\/\" class=\"image-card__link\">En savoir plus<\/a>\n                                            <\/div>\n                                        <\/div>\n                                    <\/div>\n                                <\/div>\n                                                                <div class=\"image-cards-slider-item fx-slide\">\n                                    <div class=\"image-card\">\n                                        <div class=\"image-card__image\">\n                                            <img decoding=\"async\" width=\"700\" height=\"467\" src=\"https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/GettyImages-1457369699-700x467.jpg\" class=\"attachment-homepage-image-card size-homepage-image-card\" alt=\"GettyImages-1457369699\" srcset=\"https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/GettyImages-1457369699-700x467.jpg 700w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/GettyImages-1457369699-300x200.jpg 300w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/GettyImages-1457369699-1024x683.jpg 1024w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/GettyImages-1457369699-768x512.jpg 768w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/GettyImages-1457369699-1536x1025.jpg 1536w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/GettyImages-1457369699-900x600.jpg 900w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/GettyImages-1457369699-750x500.jpg 750w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/GettyImages-1457369699.jpg 2000w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/>                                        <\/div>\n                                        <div class=\"image-card__info\">\n                                            <div class=\"image-card__info__top\">\n                                                <a href=\"https:\/\/www.trccompanies.com\/fr\/news-and-insights-category\/videos\/\" class=\"image-card__category\">Videos<\/a>                                                <h3>Breakthrough Solutions for Coal Combustion Residuals Compliance<\/h3>\n                                                <h4 class=\"hidden-md-down\">septembre 3, 2020<\/h4>\n                                                <p class=\"image-card__description\">TRC is your trusted partner, helping to navigate the economic, environmental and regulatory pressures as well as the rapid technological advancements impacting successful coal ash management.<\/p>\n                                            <\/div>\n                                            <div class=\"image-card__info__bottom\">\n                                                <a href=\"https:\/\/www.trccompanies.com\/fr\/insights\/breakthrough-solutions-for-coal-combustion-residuals-compliance\/\" class=\"image-card__link\">En savoir plus<\/a>\n                                            <\/div>\n                                        <\/div>\n                                    <\/div>\n                                <\/div>\n                                                                <div class=\"image-cards-slider-item fx-slide\">\n                                    <div class=\"image-card\">\n                                        <div class=\"image-card__image\">\n                                            <img decoding=\"async\" width=\"700\" height=\"468\" src=\"https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/d99df596-trc-coal-ash-solar-sites-700x468.jpg\" class=\"attachment-homepage-image-card size-homepage-image-card\" alt=\"d99df596-trc-coal-ash-solar-sites\" srcset=\"https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/d99df596-trc-coal-ash-solar-sites-700x468.jpg 700w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/d99df596-trc-coal-ash-solar-sites-300x200.jpg 300w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/d99df596-trc-coal-ash-solar-sites-1024x684.jpg 1024w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/d99df596-trc-coal-ash-solar-sites-768x513.jpg 768w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/d99df596-trc-coal-ash-solar-sites-1536x1026.jpg 1536w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/d99df596-trc-coal-ash-solar-sites-898x600.jpg 898w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/d99df596-trc-coal-ash-solar-sites-748x500.jpg 748w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/d99df596-trc-coal-ash-solar-sites.jpg 1600w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/>                                        <\/div>\n                                        <div class=\"image-card__info\">\n                                            <div class=\"image-card__info__top\">\n                                                <a href=\"https:\/\/www.trccompanies.com\/fr\/news-and-insights-category\/insights\/\" class=\"image-card__category\">Insights<\/a>                                                <h3>Why Coal Ash Impoundments and Landfills Make Great Solar Sites<\/h3>\n                                                <h4 class=\"hidden-md-down\">septembre 25, 2019<\/h4>\n                                                <p class=\"image-card__description\">Hundreds of coal ash sites are set to close over the next decade and could make ideal, low-impact locations for utility-scale solar farms.<\/p>\n                                            <\/div>\n                                            <div class=\"image-card__info__bottom\">\n                                                <a href=\"https:\/\/www.trccompanies.com\/fr\/insights\/why-coal-ash-impoundments-make-great-solar-sites\/\" class=\"image-card__link\">En savoir plus<\/a>\n                                            <\/div>\n                                        <\/div>\n                                    <\/div>\n                                <\/div>\n                                                                <div class=\"image-cards-slider-item fx-slide\">\n                                    <div class=\"image-card\">\n                                        <div class=\"image-card__image\">\n                                            <img decoding=\"async\" width=\"700\" height=\"466\" src=\"https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/09\/GettyImages-1359747893-700x466.jpg\" class=\"attachment-homepage-image-card size-homepage-image-card\" alt=\"GettyImages-1359747893\" srcset=\"https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/09\/GettyImages-1359747893-700x466.jpg 700w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/09\/GettyImages-1359747893-300x200.jpg 300w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/09\/GettyImages-1359747893-1024x682.jpg 1024w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/09\/GettyImages-1359747893-768x512.jpg 768w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/09\/GettyImages-1359747893-1536x1023.jpg 1536w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/09\/GettyImages-1359747893-2048x1364.jpg 2048w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/09\/GettyImages-1359747893-901x600.jpg 901w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/09\/GettyImages-1359747893-751x500.jpg 751w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/>                                        <\/div>\n                                        <div class=\"image-card__info\">\n                                            <div class=\"image-card__info__top\">\n                                                <a href=\"https:\/\/www.trccompanies.com\/fr\/news-and-insights-category\/media\/\" class=\"image-card__category\">Media<\/a>                                                <h3>Successful Coal Ash Pond Management<\/h3>\n                                                <h4 class=\"hidden-md-down\">juillet 10, 2014<\/h4>\n                                                <p class=\"image-card__description\">Regulatory requirements, plant retirements, changes to facility operational profiles, environmental liability management and political and social pressures are among the factors driving utilities to close or consider closing their coal ash ponds.<\/p>\n                                            <\/div>\n                                            <div class=\"image-card__info__bottom\">\n                                                <a href=\"https:\/\/www.trccompanies.com\/fr\/insights\/successful-coal-ash-pond-management\/\" class=\"image-card__link\">En savoir plus<\/a>\n                                            <\/div>\n                                        <\/div>\n                                    <\/div>\n                                <\/div>\n                                                    <\/div>\n                <\/div>\n                    <\/div>\n    <\/div>\n<\/section>\n<!-- End Block: acf\/innerpage-news-and-insights -->","protected":false},"excerpt":{"rendered":"<p>Learn more about approaches to overcome the recognized limitations of Piper Diagrams and how to make the most of this valuable technique.<\/p>\n","protected":false},"featured_media":12005,"template":"","tags":[162],"news-and-insights-category":[380],"services-category":[993],"custom_category":[],"class_list":["post-1387","news-and-insights","type-news-and-insights","status-publish","has-post-thumbnail","hentry","tag-coal-ash-management","news-and-insights-category-white-papers","services-category-remediation-materials-management"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Understanding Piper Diagrams: Applications and Limitations with Coal Combustion Residuals - TRC Companies<\/title>\n<meta name=\"description\" content=\"Learn more about approaches to overcome the recognized limitations of Piper Diagrams and how to make the most of this valuable technique.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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