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IF 1.3 4区环境科学与生态学

Ground Water Monitoring and Remediation Pub Date : 2025-05-19 DOI: 10.1111/gwmr.12715

引用次数: 0

Studies in Parameter Estimation for Analytical Transport Equations II 解析输运方程参数估计的研究2

IF 1.3 4区环境科学与生态学

Ground Water Monitoring and Remediation Pub Date : 2025-04-27 DOI: 10.1111/gwmr.12723

Andrew Mills

{"title":"Studies in Parameter Estimation for Analytical Transport Equations II","authors":"Andrew Mills","doi":"10.1111/gwmr.12723","DOIUrl":"10.1111/gwmr.12723","url":null,"abstract":"Three new applications are presented to perform parameter estimation to assist in the calibration of a model based on Wexler's equation for his PATCHI three-dimensional analytical transport program. These join the analogous programs presented recently in this journal based on the Domenico equation. Because the Wexler equation involves the numerical evaluation of the integral of the solution to the partial differential equation for advective–dispersive solute transport, it is much more accurate than the Domenico equation, which omits the necessary numerical evaluation and is a closed-form expression. As in the “sister” paper, one of the applications studied is a quasi-exhaustive search method and the second is a successive parameter variation method. The third program is based on Box's Complex nonlinear, direct-search optimization method. The three programs and an already available calibration tool (PEST) were compared in tests using data from two different sites in southeastern Pennsylvania. These tests demonstrated the validity of the three programs for assisting the calibration of a groundwater analytical transport model based on the Wexler equation. The final estimates for the parameter values for the three methods and PEST applied to the data from each of the two sites compared reasonably closely. The three newly available programs individually should serve as calibrating tools of value for field hydrogeologists, environmental project managers, and others who have been asked to run the Wexler transport model (PATCHI). The results from the runs performed on the two sites indicate the Complex method to be the best option as a calibration tool, with the quasi-exhaustive search and the successive parameter estimation method being acceptable alternatives.","PeriodicalId":55081,"journal":{"name":"Ground Water Monitoring and Remediation","volume":"45 3","pages":"50-57"},"PeriodicalIF":1.3,"publicationDate":"2025-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145129447","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Education Corner: A Quick Look Back at In Situ Air Sparging 教育专区：快速回顾原位空气喷射

IF 1.3 4区环境科学与生态学

Ground Water Monitoring and Remediation Pub Date : 2025-04-26 DOI: 10.1111/gwmr.12716

Neil R. Thomson, Michael C. Marley

引用次数: 0

Practical PFAS Immobilization in the Vadose Zone by Extreme Soil Vapor Extraction: Conceptual Understanding, Modeling, and Cost Analysis 极端土壤蒸汽提取的实用PFAS在水汽区固定：概念理解、建模和成本分析

IF 1.3 4区环境科学与生态学

Ground Water Monitoring and Remediation Pub Date : 2025-04-25 DOI: 10.1111/gwmr.12722

Craig Divine, Bo Guo, Mark Brusseau, Blair Kinser, Chris Shepherd

{"title":"Practical PFAS Immobilization in the Vadose Zone by Extreme Soil Vapor Extraction: Conceptual Understanding, Modeling, and Cost Analysis","authors":"Craig Divine, Bo Guo, Mark Brusseau, Blair Kinser, Chris Shepherd","doi":"10.1111/gwmr.12722","DOIUrl":"10.1111/gwmr.12722","url":null,"abstract":"Practical and cost-effective technologies are needed for per- and polyfluoroalkyl substance (PFAS) sources in the vadose zone to prevent continued migration of these contaminants from soil to groundwater. Many PFAS are characterized by high air–water interfacial adsorption coefficient (Kaw) values, and therefore, the air–water interface exerts a strong control on their transport. As soil moisture decreases in the vadose zone, air–water interfacial area generally increases. As a result, the effective retention of some PFAS can be increased by 100-fold or more in some cases with relatively modest reductions in soil moisture content. Quantitative modeling and conceptual costing analysis confirm the viability of a two-pronged PFAS immobilization strategy where (1) a surface cap is installed which is intended to prevent water infiltration, and (2) extreme soil vapor extraction (XSVE) is applied to dry the soil, which reduces or eliminates downward water flux and increases PFAS retention. Modeling results show that water flux and PFAS mass discharge to groundwater can be essentially eliminated using this approach. Even if recharge is not completely prevented (due to a leaking cap and/or insufficient soil drying), simulations show PFAS mass discharge to groundwater will still be greatly reduced due to the significantly enhanced PFAS retention. The equipment required for this approach is commercially available, and installation costs are modest and predictable. Based on this analysis, future pilot testing and field demonstrations are warranted.","PeriodicalId":55081,"journal":{"name":"Ground Water Monitoring and Remediation","volume":"45 3","pages":"69-76"},"PeriodicalIF":1.3,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145129355","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

SERDP & ESTCP Corner: Headlines from the Environmental Restoration Program Area SERDP & ESTCP角：来自环境恢复计划领域的头条新闻

IF 1.3 4区环境科学与生态学

Ground Water Monitoring and Remediation Pub Date : 2025-04-22 DOI: 10.1111/gwmr.12721

Sarah Mass P.E., M.Sc.

引用次数: 0

Indoor Air Background Concentrations of Volatile Organic Compounds (VOCs) in California Residences 加州住宅室内挥发性有机化合物（VOCs）本底浓度

IF 1.3 4区环境科学与生态学

Ground Water Monitoring and Remediation Pub Date : 2025-04-18 DOI: 10.1111/gwmr.12719

Gina Plantz, Kelly Chatterton, Rich Rago, Bart Eklund, Heidi Hayes, Monica Tran

{"title":"Indoor Air Background Concentrations of Volatile Organic Compounds (VOCs) in California Residences","authors":"Gina Plantz, Kelly Chatterton, Rich Rago, Bart Eklund, Heidi Hayes, Monica Tran","doi":"10.1111/gwmr.12719","DOIUrl":"10.1111/gwmr.12719","url":null,"abstract":"A study was performed to measure typical “indoor air background” concentrations of volatile organic compounds (VOCs) in residential buildings in the state of California that were not known to be impacted by subsurface sources. A total of 57 buildings were sampled between February 2023 and February 2024, with one sample collected per building. The data set represents 38 different cities within the state of California. The samples were analyzed using the United States Environmental Protection Agency (EPA) Method TO-15 (EPA 1999) in both full-scan and Selected Ion Monitoring (SIM) modes. A total of 105 individual VOCs were reported for each sample. The overall data set is 5985 individual data points, with concentrations of target compound VOCs reported from less than the laboratory method reporting limit of 0.044 μg/m3 (micrograms per cubic meter) to concentrations up to 14,000 μg/m3. Various VOCs were detected at concentrations above screening levels used in California and elsewhere in the United States, including Benzene, Naphthalene, Tetrachloroethene (PCE), and Trichloroethene (TCE). These compounds are often considered “risk drivers” in vapor intrusion (VI) studies, so their presence in background air at concentrations above screening levels may complicate such studies. Compared with previous, similar studies, this study is more comprehensive with a larger number of VOCs analyzed and with greater analytical sensitivity. Based on the professional backgrounds of the study group which included environmental professionals, regulatory officials, and attorneys, the authors opine that the results of this residential indoor air background study may be biased low relative to the general population. Therefore, the results of the Study are considered to reflect a conservative snapshot of indoor air background VOCs in California residences.","PeriodicalId":55081,"journal":{"name":"Ground Water Monitoring and Remediation","volume":"45 2","pages":"40-55"},"PeriodicalIF":1.3,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/gwmr.12719","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144091283","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Advances in Remediation: Emerging Opportunities for Beneficial Recovery of Critical Minerals From Metal-Impacted Waters During Remediation 修复的进展：在修复过程中从受金属影响的水中有益回收关键矿物的新机会

IF 1.3 4区环境科学与生态学

Ground Water Monitoring and Remediation Pub Date : 2025-04-18 DOI: 10.1111/gwmr.12717

Craig Divine, Jeffrey Gillow, Paloma Spina, Shannon Ulrich, Chris Griggs, Anthony Bednar

引用次数: 0

Regulator's Perspective: Federal Groundwater Regulatory Summary for 2024 监管者的观点：2024年联邦地下水监管摘要

IF 1.3 4区环境科学与生态学

Ground Water Monitoring and Remediation Pub Date : 2025-04-16 DOI: 10.1111/gwmr.12718

Charles Job

引用次数: 0

A Non-Reactive Gas System to Reduce Well Fouling and Maintenance of Extraction Wells 减少油井结垢和油井维护的无反应气体系统

IF 1.3 4区环境科学与生态学

Ground Water Monitoring and Remediation Pub Date : 2025-04-11 DOI: 10.1111/gwmr.12711

Benjamin B. Petersen P.G., Shelly M. Griffin M.Sc., Harvey A. Cohen Ph.D., P.G.

{"title":"A Non-Reactive Gas System to Reduce Well Fouling and Maintenance of Extraction Wells","authors":"Benjamin B. Petersen P.G., Shelly M. Griffin M.Sc., Harvey A. Cohen Ph.D., P.G.","doi":"10.1111/gwmr.12711","DOIUrl":"10.1111/gwmr.12711","url":null,"abstract":"Chronic chemical and biological fouling of groundwater extraction wells can lead to high well-maintenance costs, increased pump downtime, and decreased pump efficiency. Commonly observed types of fouling include chemical precipitation of iron and carbonate minerals, bacterial accumulation, and oxidation in the pumping environment. Standard methods to rehabilitate and prevent fouling include chlorine treatments, acid and heat treatments, and physical scrubbing of screens and risers. Methods may effectively target one type of fouling while enhancing other fouling types. A down-well, fouling-prevention system was designed, tested, and then implemented on a sitewide basis at the former Bannister Federal Complex property in Kansas City, Missouri. Extraction wells at the site had a multi-decade history of chronic fouling. The antifouling system presented here creates an oxygen-deprived environment within the air column of the well through air displacement with a non-reactive gas. The removal of oxygen from the air column inhibits both biological activity and certain chemical reactions associated with fouling and does not require the use of chemical treatments or manual scrubbing. At the end of the year-long study period, chemical and biological fouling within the test wells was largely absent, whereas control wells undergoing chlorine treatment were heavily fouled and required rehabilitation.","PeriodicalId":55081,"journal":{"name":"Ground Water Monitoring and Remediation","volume":"45 2","pages":"56-64"},"PeriodicalIF":1.3,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144091548","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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In My Experience: Changing Perceived Liabilities into Assets 以我的经验：将感知负债转变为资产

IF 1.3 4区环境科学与生态学

Ground Water Monitoring and Remediation Pub Date : 2025-04-11 DOI: 10.1111/gwmr.12720

Tom Aley M.Sc

引用次数: 0