CLU-IN Technology Innovation News Survey

CRISPR BIOSENSING FOR ENVIRONMENTAL MONITORING: WORKFLOW DESIGN AND PERFORMANCE BENCHMARKING [General News]

Wed, 12 Aug 2026 18:07:53 GMT

Wang. S. and R. Hasan. Environmental Science& Technology 60(29):20150-20173(2026)

This review comprehensively analyzes CRISPR-based sensing technologies tailored for environmental contaminant detection, spanning both biological and chemical targets. Published studies were systematically evaluated across target classes, Cas effectors, recognition mediators, sample matrices, pretreatment strategies, preamplification or signal-gain approaches, readout modalities, and reported performance metrics. To support practical implementation, a five-step experimental framework was summarized for environmental CRISPR sensing. The review proposes a decision-guided design flowchart that links monitoring goals and matrix constraints to the selection of effectors, mediator-enabled transduction routes, pretreatment modules, amplification strategies, readouts, and validation controls and benchmarks reported detection limits by normalizing units and comparing trends across preamplification-aided versus preamplification-free designs and by contextualizing performance against relevant regulatory or guideline thresholds when available. Across the literature, most studies rely on spiked-matrix validation, highlighting the need for broader non-spiked real environmental sample testing and more transparent reporting of sampling, pretreatment, and performance evaluation. It advocates standardized data reporting, including consistent units, workflow metadata, and matrix-matched validation, to enable cross-study comparison and accelerate the deployment of CRISPR-based sensors for real-world environmental monitoring.

THE EVOLUTION OF PFAS REMEDIATION: THE SEARCH FOR A FOREVER SOLUTION [General News]

Wed, 12 Aug 2026 18:07:35 GMT

Appleman ,T.D. | Remediation 36(4):e70081(2026)

This paper evaluates the 10-year gap between the technical efficacy of PFAS treatment technologies and their practical implementation at full-scale. Despite over a decade of research and development of advanced technologies for PFAS removal and historical data demonstrating that high-pressure membrane systems offer superior removal of both long- and short-chain PFAS, granular activated carbon remains the predominant industry default. This retrospective analysis examines how early regulatory precedents, specifically EPA's 2016 health advisories, anchored the market in adsorptive media and created a path dependency that prioritized operational simplicity and capital expenditure over comprehensive PFAS removal. The paper also describes the escalating technical challenges associated with moving goalposts as target concentrations drop and the regulated analyte list expands. Key barriers discussed include the significant management burden of waste streams, the limitations of current targeted analytical methods in capturing the full breadth of PFAS mass, and the complexities of source-zone forensic characterization. Findings suggest that although separation technologies can effectively achieve current drinking water regulatory limits, a true "forever solution" remains a research goal.

PHYTOREMEDIATION FOR SOIL POLLUTION: A COMPREHENSIVE REVIEW OF MECHANISMS, APPLICATIONS, AND CHALLENGES [General News]

Wed, 12 Aug 2026 18:07:15 GMT

Mamgain, S., B. Ghale, H.S. Sodhi, and M. Thapa. | Remediation 36(3):e70073(2026)

This review systematically evaluates key phytoremediation strategies, including phytoextraction, phytostabilization, phytovolatilization, phytofiltration, and phytodegradation. It emphasizes strategy-wise synthesis, where comparative tables provide data on plant species, contaminant type, bioaccumulation and translocation factors, and total recovery efficiency, providing practical recommendations for context-based application. Though plant-based mechanisms such as root uptake, translocation, chelation, and antioxidant responses contribute to detoxification, the operational success of phytoremediation hinges on selecting the right strategy for the right condition. Despite certain limitations such as long remediation durations and disposal challenges of biomass, advances in microbial synergy, genetic manipulation, and field-based studies are enhancing the efficacy and scalability of these technologies. The review concludes by advocating evidence-based selection frameworks and interdisciplinary research, making phytoremediation part of sustainable soil management and pollution control measures.

WATERSHED CONTAMINATED SOURCE DOCUMENT (WCSD) UPDATE WITH PER- AND POLYFLUOROALKYL SUBSTANCES (PFAS) CONSIDERATIONS [General News]

Wed, 12 Aug 2026 18:06:57 GMT

Hovel, W. and J. Arblaster. Technical Memorandum TM-NAVFAC EXWC-SH-2601, 22 pp, 2026

A Watershed Contaminated Source Document (WCSD) documents Navy and non-Navy sources that could have an impact on sediments at a Navy site. This memorandum serves as supplemental guidance on how to prepare WCSDs in accordance with the Chief of Naval Operations Policy on Sediment Site Investigation and Response Action. It incorporates lessons learned and recommendations based on a review of twelve WCSDs completed since 2003 and includes considerations for sites with potential PFAS sources. Https://exwc.navfac.navy.mil/Portals/88/Documents/EXWC/Restoration/er_pdfs/s/Final_WCSD_Report_Apr26.pdf?ver=StJgsW0JNzZTYCJd_z79Ow%3d%3d

THE DIFFUSIVE GRADIENTS IN THIN-FILMS CALCULATOR [General News]

Wed, 12 Aug 2026 18:06:40 GMT

Fairey, J. ESTCP Project ER20-1363, 2026

This calculator is intended to be used to estimate the threshold time-weighted average PFAS concentration that is quantifiable using diffusive gradients in thin films (DGT) passive samplers. This DGT calculator may be used to estimate the required deployment time to allow for sufficient PFAS adsorption in field deployments by adjusting deployment time, number of DGT devices or exposed gel area, and the final methanol extract volume. Calculations are based on the DGT equation and are estimates only. Https://sepub-prod-0001-124733793621-us-gov-west-1.s3.us-gov-west-1.amazonaws.com/s3fs-public/2026-07/The%20Diffusive%20Gradients%20in%20Thin-Films%20Calculator.xlsx?VersionId=T138lD51yeDHGprZWOAA2Sgr_xBzzX26

SLOW-RELEASE PHOSPHORUS NUTRIENTS AS BIO-STIMULATING AGENTS FOR GROUNDWATER ORGANIC CONTAMINATION REMEDIATION [Research]

Wed, 12 Aug 2026 18:06:10 GMT

Zhao, S., Z. Liu, F. Zhang, Z. Li, M. Sun, Y. Xie, J. Liu, and S. Zhang.
Groundwater for Sustainable Development 34:101639(2026)

A study addressed the challenges of low bio-stimulated remediation efficiency in groundwater organic contamination, which is frequently limited by rapid leaching and short residence time of traditional water-soluble phosphorus nutrients. A novel coated slow-release phosphorus nutrient material with a tunable release profile was developed based on surface hydrophobic modification. Using highly water-soluble calcium dihydrogen phosphate and low-solubility calcium phosphate as cores, a silica inorganic coating was first applied via a tetraethyl orthosilicate sol-gel method, followed by chemical grafting with octyltriethoxysilane (OTES) to create a hydrophobic outer layer. Characterization confirmed a transition from a hydrophilic (contact angle ≈10°) to a hydrophobic surface (contact angle >95°). A differentiated phosphorus release system was established based on the intrinsic solubility of the cores: OTES-SI@CDP exhibited a release period of ~21 days, whereas OTES-SI@TCP displayed an estimated ultra-slow release of up to 255 days. In bio-stimulated degradation tests targeting benzene and toluene, the slow-release phosphorus nutrients markedly enhanced contaminant removal, increasing degradation ratios from 17.2% to 20.6% (phosphorus-free control) to 44.8% and 54.7% over 35 days. Microbial community analysis revealed selective enrichment of BTEX-degrading consortia, particularly the Pseudomonas genus, demonstrating that sustained, diffusion-controlled phosphorus delivery actively reshapes the microbial community toward enhanced biodegradation capacity.

CHARACTERIZATION OF MULTIPLE TRICHLOROETHENE, CIS-DICHLOROETHENE AND 1,1-DICHLOROETHENE DEGRADING PROPANOTROPHIC COMMUNITIES [Research]

Wed, 12 Aug 2026 18:05:54 GMT

Faghihinezhad, M., Z. Eshghdoostkhatami, and A.M. Cupples.
Journal of Environmental Management 408:129957(2026)

Propane-enriched mixed cultures (derived from agricultural soils and an impacted site sediment) that previously degraded 1,4-dioxane were evaluated for their capacity to also degrade TCE, cDCE, and 1,1-DCE over successive transfers. Sustained biodegradation of TCE and cDCE was observed across multiple enrichments, and cultures enriched on one compound generally degraded the other. In contrast, 1,1-DCE biodegradation was restricted to a subset of cultures and removal times increased over transfers. Further, 1,1-DCE removal was absent at elevated concentrations, both trends consistent with inhibitory or toxic effects. Whole genome sequencing analyses revealed pronounced substrate-dependent selection of microbial communities, with cDCE-degrading cultures being dominated by Mycobacterium and Mycolicibacterium, whereas TCE-degrading cultures were dominated by Rhodococcus. Rhodococcus metagenome-assembled genomes (MAGs) in the TCE-degrading cultures were classified as R. opacus or R. wratislaviensis. 1,1-DCE-degrading cultures were dominated by Pseudonocardia, although the associated MAGs contained a truncated propane monooxygenase alpha subunit, suggesting other enzymes were responsible for 1,1-DCE transformation. Functional gene analysis identified both group 5 (prmABCD) and putative group 6 propane monooxygenases (although their expression was not examined). Results demonstrate that substrate-specific pressures govern propanotrophic community structure and function and highlight distinct roles of key actinobacterial genera in chlorinated ethene cometabolism. Findings support the development of propane-based bioaugmentation strategies for the treatment of mixed chlorinated solvent contamination under aerobic conditions.

LONG-TERM VOC TRANSPORT IN A THICK HETEROGENEOUS VADOSE ZONE AND PERCHED AQUIFERS: JERUSALEM MOUNTAINS INDUSTRIAL SITE [Research]

Wed, 12 Aug 2026 18:05:37 GMT

Shalom, O., O. Lev, M.J. Caspi, and H. Gvirtzman. | Water 18:702(2026)

A study reconstructed long-term PCE migration from a former industrial site in the Jerusalem Mountains, where leakage likely began ten years after plant commissioning and systematic monitoring started decades later. The study applied a 3D numerical model of flow and transport, incorporating calibrated hydraulic parameters, karstic conduits, and multiphase VOC processes including advection, dispersion, phase partitioning, volatilization, and first-order degradation kinetics. Multiple model runs explored plausible leakage scenarios under sparse historical data. Simulated PCE concentrations reproduce measurements in the vadose zone (R²=0.89) and deep regional aquifer (~20% normalized relative error). Results reveal pronounced preferential flows horizontally through perched aquifers and vertically along discrete faults, amplified by karstic networks. The upper vadose zone remains a persistent source, sustaining gas-phase emissions toward nearby residential areas unless targeted remediation is applied. Integrated modeling, even with limited monitoring, quantitatively reconstructs complex contaminant dynamics across saturated and unsaturated compartments, providing critical guidance for remediation. This article is Open Access at https://www.mdpi.com/2073-4441/18/6/702.

MACHINE LEARNING–ENHANCED PFAS CONTAMINANT FATE AND TRANSPORT MODELING FOR OPTIMIZED GROUNDWATER REMEDIATION STRATEGIES AT INDUSTRIAL SITES [Research]

Wed, 12 Aug 2026 18:05:19 GMT

Anokye, A. | Journal of Sustainable Development and Policy 5(1):34-72(2026)

A study investigated the persistent challenge of accurately modeling PFAS fate and transport in groundwater at industrial sites, where heterogeneous geology, variable groundwater flow, mixed PFAS chemistries, and uncertain source zones often weaken remediation planning and delay effective intervention. The research examined whether machine learning enhanced PFAS fate and transport modeling can improve the optimization of groundwater remediation strategies in complex industrial settings. The study adopted a quantitative, cross-sectional, case-based design and drew on a purposive sample of 120 professionals from cloud and enterprise-style environmental decision contexts. The key variables were PFAS transport complexity, machine learning modeling capability, machine learning predictive trust, PFAS predictive modeling quality, and optimized groundwater remediation strategies. Data were collected through a structured 5-point Likert scale questionnaire and analyzed using descriptive statistics, Cronbach's alpha, Pearson correlation, and multiple regression in SPSS. Reliability was strong across all constructs, with Cronbach's alpha values ranging from 0.82 to 0.89 and an overall instrument reliability of 0.86. Descriptive findings showed high mean scores for PFAS transport complexity, machine learning modeling capability, predictive trust, predictive modeling quality, and remediation optimization. Correlation analysis revealed that predictive modeling quality had the strongest association with optimized remediation strategies. Regression results showed that the model explained 68.4% of the variance in remediation optimization, with predictive modeling quality emerging as the strongest predictor, followed by machine learning capability, PFAS transport complexity, and predictive trust. Https://jsdp-journal.org/index.php/jsdp/article/view/58/54

TRACKING PFAS IN MIAMI-DADE, FLORIDA GROUNDWATER: TRENDS, HOTSPOTS, AND REGULATORY IMPLICATIONS FROM A MULTI-YEAR MONITORING STUDY [Research]

Wed, 12 Aug 2026 18:05:00 GMT

Guerra de Navarro, M., R. Zurbaran, C.C. Lugo, and N. Quinete.
Environmental Monitoring and Assessment 198:570(2026)

PFAS occurrence, spatial distribution, and associated health risks were investigated in Miami-Dade County, Florida, using 1,600 samples collected from monitoring wells, raw water, and point-of-exit locations between 2019 and 2023. PFOA and PFOS were detected in >90% of samples, while 6:2 fluorotelomer sulfonate, perfluorohexanoic acid, and perfluoropentanoic acid exhibited the highest concentrations. Spatial mapping identified contamination hotspots near airports and firefighting training facilities, with elevated 6:2 FTS levels suggesting AFFF as a primary source. PFAS profiles also indicated contributions from wastewater treatment, landfills, and industrial activities. Rainfall events were positively correlated with increased ∑PFAS concentrations, supporting infiltration-driven mobilization. All POE samples exceeded the newly established U.S. National Primary Drinking Water Regulations, frequently due to PFOA and PFOS concentrations, and some samples occasionally surpassed a hazard index of 1. Miami-Dade Water and Sewer Department has initiated treatment pilot studies to address these exceedances. Cumulative risk assessments revealed elevated exposure levels across all service areas, underscoring the need for improved treatment technologies and regulatory oversight. Findings offer critical insights into contamination patterns, exposure risks, and the urgent need for mitigation strategies to protect public health and ensure regulatory compliance. Https://link.springer.com/content/pdf/10.1007/s10661-026-15419-6.pdf

FORMATION OF PERFLUOROCARBOXYLIC ACIDS (PFCAS) FROM THE INCOMPLETE THERMAL DECOMPOSITION OF PERFLUOROOCTANESULFONIC ACID (PFOS) AND PERFLUOROOCTANOIC ACID (PFOA) [Research]

Wed, 12 Aug 2026 18:04:39 GMT

Weber, N.H., J.D. Krug, W.R. Roberson, E.P. Shields, M.A.G. Wallace, G.V. West, J.M. Mattila, R.P. Burnette, M.R. Allen, K.M. Barnett, L. Virtaranta, G.C. Whitfield, W.T. Preston, and W.P. Linak. | ACS ES&T Air 3(1):197-207(2026)

Two solutions containing ∼500 mg/L of PFOS and PFOA were atomized at two post-flame locations within a natural gas-fired pilot-scale combustor with peak temperatures of ∼860°C and ∼750°C. The thermal destruction of PFOS and PFOA and the formation of fluorocarbon products of incomplete combustion (PICs) were analyzed using EPA Other Test Method (OTM)-45, an activated carbon-based thermal desorption (TD) tube GC/MS method, and two real-time methods including iodine-adduct chemical ionization mass spectrometry (CIMS) and Fourier transform infrared spectrometry. Destruction efficiencies determined for PFOS by OTM-45 and for PFOA by both OTM-45 and CIMS were >99.99% for both peak injection temperatures. OTM-45 and CIMS confirmed the presence of several PFCAs as PICs. These PFCAs included trifluoroacetic acid and PFPrA for both solutions and also included the formation of PFOA from PFOS and similarly PFHpA from PFOA. PFCA concentrations and the relative amounts of PFOA and PFHpA increased at the lower temperature. OTM-50 and the TD tube analysis identified numerous fluorocarbon PICs, including 1H-perfluoroalkanes, and perfluoroalkanes such as trifluoromethane (CHF3) and hexafluoroethane (C2F6). Https://pubs.acs.org/doi/pdf/10.1021/acsestair.5c00317?ref=article_openPDF

ARSENIC MOBILIZATION AND RECIRCULATION DYNAMICS: GROUNDWATER CIRCULATION WELLS FOR ENHANCED DECONTAMINATION IN COMPLEX COASTAL AQUIFER ENVIRONMENTS [Demonstrations]

Wed, 12 Aug 2026 18:04:18 GMT

Ciampi, P., D. Feriaud, D. D'Emilio, F. Tatangelo, L. Lanzafame, M. Pasini, and M.P. Papini.
Groundwater for Sustainable Development 31:101538(2025)

A pilot study evaluated groundwater circulation wells (GCWs) as a technology to mobilize and remove As, focusing on developing a GCW-induced recirculation cell. The study was conducted at a coastal industrial site with longstanding As contamination, representative of complex hydrogeology. A relational geodatabase integrated data from 76 boreholes, 41 piezometers, two multi-level sampling wells (MLSWs), and one GCW. A 3D stratigraphic model supported the design of a 23 m GCW with screened sections at 6÷8, 12÷15, and 19÷22 m. Groundwater was extracted, treated above ground, and reinjected to establish a recirculation cell. Hydrochemical and electrical conductivity (EC) monitoring over 550 days captured the spatial and temporal dynamics of As mobilization, removal, and salinity mixing. The GCW-induced recirculation cell mobilized As concentrations up to ∼9,000 µg/L before stabilizing at ∼6,500 µg/L. The system achieved a 66% removal efficiency, extracting ∼80 kg of As while promoting groundwater mixing. EC data from MLSWs provided unprecedented insights into the spatiotemporal evolution of the recirculation process. Findings demonstrate that GCWs provide a viable and sustainable alternative to conventional remediation strategies for addressing persistent As contamination in complex coastal aquifers. Https://www.sciencedirect.com/science/article/pii/S2352801X25001353/pdfft?md5=ad54bc0c8e5b2324bd0e17c399f57d75&pid=1-s2.0-S2352801X25001353-main.pdf

APPLICATION OF TIME-LAPSE ERT TO ASSESS HETEROGENEITY IN SOIL MOISTURE DYNAMICS AND CONTAMINANT PLUME AND ASSOCIATED GEOTECHNICAL AND ENVIRONMENTAL RISKS [Demonstrations]

Wed, 12 Aug 2026 18:04:00 GMT

Eze, S.U., E.S. Chinemelu, J.O. Alao, O.M. Orji, O.O. Omotola, F.A. Abija, S.A. Saleh, and T.J. Oladipupo. | Discover Geoscience 4:17(2026)

Time-lapse electrical resistivity tomography (TL-ERT) data sets from two locations in southern Nigeria were employed to monitor seasonal variations in soil moisture content (SMC) at an engineering site and the effect of biodegradation of contaminant plumes on the environment in an automobile workshop. Six 2D ERT (engineering site) and four 2D ERT (auto workshop) profiles acquired during two time seasons were used to perform simultaneous inversion. The data acquired at the engineering site in the rainy and dry seasons characterized the hydrogeological behavior of the subsurface, with high and low water content observed in both seasons. The geology is predominantly sand with low water-retaining capacity. The fine/clayey sand layers with fine particles that retain more water can initiate geotechnical instabilities, making the overlying materials susceptible to failure. The percentage differences in electrical conductivity (EC) between the monitoring periods showed little or no significant change in the EC of subsurface water. The 2D ERT data sets from the auto workshop showed increasing evidence of biodegradation of high-ER contaminants indiscriminately spilled on the surface into low-resistivity/conductive plumes with an ER range of 10-31.6 Ωm and % conductivity differences of 50-100%. The percentage differences in ER show that the low ER/conductive zones had spread within the subsurface to a depth of about 17.1 m, implying that overtime the auto workshop generates a toxic blend of contaminants that seeps into the ground from the surface. This complex dynamic process can linger for longer periods, compromising the integrity of the environment, posing a danger to water resources and environmental and human health. Https://link.springer.com/content/pdf/10.1007/s44288-026-00393-w.pdf

TIME-LAPSE ERT MONITORING OF THE MPE-INDUCED CONE OF DEPRESSION AT A LOW-PERMEABILITY NAPL SITE: A FIELD-BASED QUANTITATIVE ASSESSMENT OF ARRAY-DEPENDENT GEOMETRIC FIDELITY [Demonstrations]

Wed, 12 Aug 2026 18:02:02 GMT

Guo, Y., D. Zhang, Z. Zhang, and B. Zeng.
Journal of Contaminant Hydrology 280:104949(2026)

A study compared the feasibility and geometric accuracy of Wenner and array Dipole-Dipole for reconstructing drawdown cones using time-lapse electrical resistivity tomography (ERT) and examined the mechanisms controlling array performance. A pilot-scale multiphase extraction (MPE) test was conducted at a typical low-permeability NAPL site. High-density water-level data from monitoring wells were used as a reference in a multi-dimensional geometric error analysis. The analysis defined confidence thresholds for drawdown cone boundaries in the ERT images, then compared reconstructed cones with observations in terms of depth (h), radius ®, and the corresponding coefficients of determination (R²). The Dipole-Dipole array showed high geometric consistency with the hydraulic data (depth R² = 0.89-0.91; radius R² = 0.84-0.92), with radius errors <0.7 m, and provided continuous geometrical information between wells. In contrast, the Wenner array produced strong systematic distortion, with radius overestimation up to 4.77 m and negative R2 values. Mechanistic analysis indicates that these distortions arise from coupling between volumetric averaging linked to the array sensitivity distribution and smoothing constraints in the inversion. For hydraulic control monitoring of MPE at low-permeability NAPL-contaminated sites, ERT shows strong potential as a spatial complement to monitoring wells, and the Dipole-Dipole array improves delineation of the pumping influence zone.

POST-REMEDY EVALUATION USING 3-D MODELING TO REFINE REMEDIAL STRATEGY AT A LEGACY TCE SITE [Cleanup News]

Wed, 12 Aug 2026 18:01:47 GMT

Temple, J. | DCHWS West 2025 Winter Symposium, 26-28 January, Denver, CO, 27 slides, 2026

Historical releases of TCE from degreasing operations at the F.E. Warren Air Force Base led to significant groundwater contamination. Multiple remedial actions were implemented, including grease traps and surrounding contaminated soil removal, a P&T system, a ZVI PRB, and subsurface bioremediation injections. While the remedies initially reduced TCE concentrations, long-term monitoring revealed persistent contamination, with TCE remaining above cleanup levels in many areas, including deeper zones of the aquifer and areas downgradient of treatment locations, indicating the need to adjust the remedial approach. To better understand limitations and inform potential future corrective actions, a comprehensive evaluation was conducted using modern tools to reassess remedy performance. This included targeted high-resolution data collection and the development of an updated 3-D conceptual site model (CSM) using Earth Volumetric Studio™. The 3-D CSM integrated lithology, hydrogeology, and vertical profiling data collected, providing a detailed and spatially resolved visualization of both site conditions and contaminant distribution. The evaluation demonstrated that the remedies were not designed or implemented to fully address deeper zones of contamination. The updated 3-D CSM revealed that residual TCE mass at depth continues to act as an ongoing source, contributing to sustained concentrations in downgradient wells. Lessons learned highlight the importance of modern post-construction evaluation tools in understanding remedy limitations and optimizing long-term performance. 3-D modeling was critical in identifying untreated contaminant mass and clarifying how site heterogeneity influenced remedy effectiveness. The work is informing the development of additional corrective actions that will target previously untreated zones and ensure future remedial efforts address the full extent of contamination. Https://mediacdn.guidebook.com/upload/213718/tVdZWzWfdeKEveCWsX7pNJ5o29uVRd5S8qnT.pdf

TWO-PHASED APPROACH FOR DESIGNING AN EFFECTIVE, COST-EFFICIENT AND AREA-SPECIFIC REMEDY [Cleanup News]

Wed, 12 Aug 2026 18:01:27 GMT

Wood, T. | DCHWS West 2025 Winter Symposium, 26-28 January, Denver, CO, 15 slides, 2026

A two-phased approach was implemented to address complexities for a contaminated sediments remedial design while resolving design challenges. The two-phased remedial design included an initial assessment, followed by final design optimization and selection. The design approach was employed for a complex 117-acre contaminated sediment site on the West Coast, where COCs included PCBs, PAHs, dioxins, and polychlorinated dibenzofurans. Remedial technologies combined dredging and capping using multiple cap designs. Phase 1 established a comprehensive framework that considered all factors driving design optimization. Multiple potential cap design options were developed to enable more detailed evaluation and comparison in Phase 2. Phase 2 focused on selecting the most effective design options by systematically evaluating remedy effectiveness, cost-efficiency, constructability, and dredging needs, in addition to assessing the need to dredge instead of capping at selected management units. During the design process, three major challenges were encountered and addressed, including 1) non-focused COCs (mainly arsenic) driving remedial design assignment; 2) site use compatibility to accommodate both heavy and light industrial activities; and 3) constructability considerations. The final design targeted successful containment of the site-wide 95th percentile arsenic concentration, and specific cap selections were made for each site unit based on local conditions. A sophisticated design matrix was used to determine the optimal cap design options for over 100 individual site units based on area-specific conditions. Assignments were evaluated for constructability to ensure continuity in cap placement and realistic construction sequencing within limited work windows. This challenge required balancing constructability constraints with protective remedy requirements while optimizing overall project costs. The two-phased approach allowed the critical design challenges to be identified and addressed while maintaining focus on remedy effectiveness, cost-efficiency, and constructability, providing a framework for managing complex remedial designs that must balance multiple competing priorities. Https://mediacdn.guidebook.com/upload/213718/SwzrBFUnQ3Q9JCn98giN50o6NrK5CZfWYTbA.pdf

MONITORING GROUNDWATER THERMAL TREATMENT USING A FIBER-OPTIC DISTRIBUTED TEMPERATURE SENSING NETWORK [Cleanup News]

Wed, 12 Aug 2026 18:01:11 GMT

Becker, M.W., F. Cason, M. Ward-Baranyay, C. Divine, J. Munholland, and E. Zardouzian.
Sensors 25(23):7105(2025)

A thermal in situ sustainable remediation (TISR®) system was installed at site SD015 at Vandenberg Space Force Base to treat a chlorinated solvent groundwater source zone. Prior to TISR, the source zone and downgradient groundwater plume were managed with enhanced in situ bioremediation and a dynamic groundwater recirculation approach. The effectiveness of a fiber-optic distributed temperature sensing (DTS) system was demonstrated as a high spatial and temporal resolution monitoring strategy. The DTS sensing system required installation of fiber optic cable in the subsurface. Boreholes were drilled with hollow casings, a fiber optic cable was inserted into the casings, and then the casings were withdrawn to allow the formation to collapse around the fiber. The fiber was then fusion-spliced into a single continuous fiber that could be interrogated by a Raman-based DTS unit. Temperature measurements were collected at 30 min intervals over a 575 m span with 0.25 m spatial sampling, resulting in over 110,000 temperature data points per day. Development of thermal plumes emanating from solar-heated borehole heat exchangers could be closely monitored with the high-resolution monitoring. The pseudo-3D monitoring network showed the lateral and upward migration of the induced thermal plumes over time. This information was valuable for assuring the heated groundwater was contacting the intended treatment zone. Https://pmc.ncbi.nlm.nih.gov/articles/PMC12694422/pdf/sensors-25-07105.pdf

PRE-SOLICITATION SYNOPSIS FOR REMEDIAL ACTION AT THE ONONDAGA LAKE SUPERFUND SITE, OPERABLE UNIT 2? LEY CREEK DEFERRED MEDIA PORTION OF THE GENERAL MOTORS-INLAND FISHER GUIDE SUBSITE, ONONDAGA COUNTY, NY (PRESOL) [Market/Commercialization]

Wed, 12 Aug 2026 18:00:37 GMT

U.S. Army Corps of Engineers, Northwestern Engineer Division, Kansas City District, Kansas City, MO
Opportunities on SAM.gov W912DQ26RA004, 2026

When this solicitation is released on or about JULY 30, 2026, it will be competed as a full and open competition. The U.S. Army Corps of Engineers, Northwestern Engineer Division, seeks a contractor to provide remedial action services at the Ley Creek Deferred Media portion of the General Motors-Inland Fisher Guide Subsite, Onondaga Lake Superfund Site, Operable Unit 2, in Onondaga County, New York. The contractor will perform remedial activities including excavation, dewatering, off-site disposal of PCB-contaminated soil and sediments, and placement of clean fill along Ley Creek. The estimated construction magnitude is $100 million to $250 million, with an anticipated five-year period of performance. There is no solicitation at this time.
Https://sam.gov/workspace/contract/opp/622c8d4bbb87417c8340c83381a127bc/view

NAVAJO AREA - ABANDONED MINES RESPONSE AND CONSTRUCTION SERVICES (SRCSGT) [Market/Commercialization]

Wed, 12 Aug 2026 17:59:36 GMT

U.S. Environmental Protection Agency, Region 9 Contracting Office, San Francisco, CA
Opportunities on SAM.gov 68HE0926R0006, 2026

This is an industry day and site walk event notice. EPA is hosting an Industry Day and site visit for contractors interested in supporting the upcoming Five-Year Abandoned Mine Response and Construction Services II (AMRCS II) requirement under NAICS code 562910. The contract will involve cleanup, emergency response, and construction services primarily at former uranium mining sites located within or near the Navajo Nation. Because radiological mine and mine-related waste is the primary contaminant at these sites, contractors should have demonstrated expertise in radiological material handling, environmental data collection, and environmental data interpretation. The in-person Industry Day will be held at the Cover Chapter House, approximately 42 miles from U.S. Highway 491 and 10 miles west of Red Valley, Arizona, on Navajo Route 33. Following the presentation, attendees will have time for a bring-your-own lunch before participating in a site visit to selected LMMD mine sites. The event is anticipated to take place in August or September, with the exact date to be announced. Participants will have the opportunity to discuss technical aspects of the upcoming AMRCS II procurement and learn more about anticipated contracting opportunities. There is no solicitation at this time. Https://sam.gov/workspace/contract/opp/0722985b7e7949698a484b7379f610b6/view

PHASE 2 REMEDIATION SERVICES AT THE PR-58 SITE IN NORTH KINGSTOWN, RHODE ISLAND (SRCSGT) [Market/Commercialization]

Wed, 12 Aug 2026 17:59:17 GMT

U.S. Army Corps of Engineers, Engineer Division North Atlantic, New England District, Concord, MA
Opportunities on SAM.gov W912WJ26X1C6A

This is a sources sought notice for marketing research purposes under NAICS code 562910. The U.S. Army Corps of Engineers, New England District, seeks to identify qualified firms capable of performing Phase 2 remedial action services at the Former Nike Battery PR-58 and Disaster Village Training Area on Quonset Point Naval Air Station in North Kingstown, RI. The requirement will address remediation of a dissolved-phase CVOC groundwater plume resulting from historical military and industrial operations at the site. Phase 2 remediation will focus on an approximately 44-acre groundwater plume containing CVOCs, including TCE, tetrachloroethane, perchloroethene, and associated degradation products. The selected remedy will include in-situ chemical reduction (ISCR), enhanced in-situ bioremediation (EISB), biostimulation, bioaugmentation, and monitored natural attenuation to achieve long-term site conditions suitable for unlimited use and unrestricted exposure. The Government is seeking firms with demonstrated experience in groundwater remediation and bioremediation technologies, including ISCR, EISB, and related treatment approaches. The anticipated acquisition is a Single Award Task Order Contract with an estimated capacity of $20 million and a five-year ordering period, with solicitation anticipated in January 2027 and contract award planned for January 2028. Capability packages are due by 1:00 PM EDT on August 14, 2026. https://sam.gov/workspace/contract/opp/e055b2abfefe4d3988bff332031eec63/view

MUNITIONS RESPONSE ACTIONS AT VIEQUES, PUERTO RICO AND OTHER SITES (SRCSGT) [Market/Commercialization]

Wed, 12 Aug 2026 17:58:48 GMT

U.S. Department of the Navy, NAVFAC Atlantic Command, Norfolk, VA
Opportunities on SAM.gov N6247026R0040, 2026

This is a sources sought notice for marketing research purposes. The U.S. Department of the Navy seeks to identify qualified firms capable of performing munitions response actions that enable lands and waters potentially impacted by military munitions to be safely used for their intended purposes. Work will primarily be performed at former Navy facilities on Vieques, Puerto Rico, but may also occur at other locations within the NAVFAC area of responsibility, including the continental United States, the Caribbean, Europe, Africa, Southwest Asia, Hawaii, the Far East, the Pacific, and other worldwide locations. Contractors may be required to perform multiple task orders for various U.S. Government agencies. Services may include munitions investigations, removal actions, and remedial actions in both terrestrial and aquatic environments. Contractors will safely locate, identify, recover, evaluate, manage, and dispose of munitions and related debris in accordance with individual task orders. All work shall comply with Department of Defense Explosives Safety Board requirements, the Defense Environmental Restoration Program, CERCLA, the NCP, and other applicable federal laws and regulations. Individual projects are typically valued at $10 million or more. Completed sources sought capabilities questionnaires are due by 5:00 PM EDT on August 14, 2026
https://sam.gov/workspace/contract/opp/ab65bf4bfbe7497a833567904024198a/view

RESEARCH PROGRESS ON THE MIGRATION OF DNAPL POLLUTANTS IN FRACTURED MEDIA [General News]

Tue, 28 Jul 2026 19:27:18 GMT

Xian, L., C. Zheng, Y. Yuan, Y. Yang, and Y. La. | Sustainability 18:3289(2026)

This paper provides an overview of mathematical models for multiphase flow migration in fractured media, followed by a systematic analysis and classification of DNAPL migration mechanisms based on lab experiments and numerical simulations. Key challenges in current DNAPL remediation practices are discussed, including difficulties in monitoring and characterizing fractured aquifers, limited delivery and utilization efficiency of remedial agents, and the back-diffusion of DNAPL from low-permeability zones. Based on the analysis, three primary DNAPL remediation approaches, including physical, chemical, and biological methods, are reviewed and evaluated. Future research directions for understanding DNAPL migration and improving remediation strategies in fractured media are proposed. The review bridges mechanistic knowledge, simulation research, and remediation practice, providing insights that contribute to future technological progress and management decision-making in DNAPL-contaminated fractured aquifers. This article is Open Access at https://www.mdpi.com/2071-1050/18/7/3289.

ENCAPSULATION OF PFAS IN LANDFILL LEACHATE FORMING AN ALTERNATE DAILY COVER [General News]

Tue, 28 Jul 2026 19:27:02 GMT

Ruehl, P. | PFAS Forum VI, 13-15 May, Orlando, FL, 24 minutes, 2026

The state-of-practice and typical results of the successful use of cement products for solidification/stabilization (S/S) of landfill leachate concentrate are described in this presentation. A typical landfill may have 10,000-100,000 gal or more of leachate to manage, with as much as one-third of a landfill's operating costs devoted to leachate management. The concentrated leachate almost always contains significant amounts of PFAS. A patented method was developed for encapsulating PFAS from the concentrate, dramatically reducing the availability of PFAS to the environment. Typical analytical results indicate two to five orders of magnitude reduction between the concentration of PFAS in the concentrate and the extraction fluid. The method describes how PFAS is encapsulated in an inorganic matrix formed by mixing the contaminated concentrate with a mineral binder. The slurried concentrate can be sprayed onto the landfill working face shortly after it has been treated. The landfill can then increase its capacity and extend its useful life by using the treated leachate as an Alternate Daily Cover instead of the usual six inches of "free" dirt from onsite. This increased capacity can significantly offset the price of the binder and provide a permanent solution to recapturing PFAS-contaminated leachate. The method eliminates offsite disposal costs for leachate and the need to recirculate leachate into the landfill. This process eliminates the endless cycle of PFAS from landfill to POTW and back again, constituting 100% resource recovery. See times 48:00-1:11:57 https://www.youtube.com/watch?v=D2wCC4H_Ea4

A PORTABLE MULTI-PARAMETER FLUID MONITORING UNIT FOR REAL-TIME MEASUREMENTS DURING WELL DEVELOPMENT AND GEOTHERMAL OPERATIONS [General News]

Tue, 28 Jul 2026 19:26:39 GMT

Virchow, L., J.F. Ludicke, R. Peksa, T. Ballerstedt, S. Kranz, and S. Regenspurg.
Groundwater Monitoring & Remediation 46(2):89-97(2026)

FluMoMax, a portable fluid monitoring unit, can measure several physicochemical parameters in real time to monitor fluid characteristics and enable early detection of geochemical processes such as scaling, corrosion, particle mobilization, and oxygen intrusion. FluMoMax integrates sensors to continuously measure pH, oxidation-reduction potential, specific electrical conductivity, dissolved oxygen, temperature, turbidity, and density. Optical fluid changes can be visually observed through a sighting tube. Various valves are installed for fluid sampling or connecting additional monitoring devices. Particle filters can be connected for high-turbidity water. The inline pump regulates the flow rate and ensures backflow without pressure loss into the main production or injection flow line. The device is designed for use in the field and can operate at process temperatures of up to 120°C and pressures of up to 10 bar. It was first tested at a drilling site in Berlin under temperatures of up to 107°C and pressures of up to 7 bar, demonstrating operational reliability for field deployment. FluMoMax provides a robust and modular solution for multi-parameter monitoring, thereby improving the understanding of hydrogeochemical dynamics during groundwater extraction and injection. Https://ngwa.onlinelibrary.wiley.com/doi/epdf/10.1111/gwmr.70041

REMEDIATING AND REDUCING THE ENVIRONMENTAL IMPACT OF FIRE SUPPRESSION SYSTEMS CONTAMINATED WITH PER- AND POLYFLUOROALKYL SUBSTANCES: PERSPECTIVES ON CURRENT GUIDELINES [General News]

Tue, 28 Jul 2026 19:26:24 GMT

Magnuson, M.L., T. Sleight, and W.F. Harper Jr. | Fire Safety Journal 163:104811(2026)

This document provides overall technical framework guidelines toward remediation of fire suppression systems containing certain PFAS originating from AFFF use, which are being replaced with fluorine-free foam (F3) alternatives. PFAS remediation from AFFF-contaminated surfaces is a complex and multi-disciplinary technical topic, and this framework is intended to help practitioners navigate the many intertwined details. As practical application of these details can vary greatly from system to system, this document discusses the implications of PFAS persistence and a comprehensive range of considerations regarding remediation of fire suppression systems contaminated with PFAS. This document can help owners take substantial steps toward the goal of reducing PFAS contamination in fire suppression systems.

RESPONSE CHARACTERISTICS OF MICROBIAL COMMUNITY IN SOIL COCONTAMINATED WITH HEAVY METALS AND CHLORINATED HYDROCARBONS: A FIELD STUDY AT A DEMOLISHED ELECTROPLATING PLANT SITE [Research]

Tue, 28 Jul 2026 19:26:12 GMT

Gou, Y., H. Pang, N. Wu, J. Zhang, X. Li, J. Wang, L. Zeng, L. Wei, R. Kang, W. Wei, and P. Li. | International Biodeterioration & Biodegradation 206:106211(2026)

A study examined the distribution of pollutants and the response characteristics of bacteria and organohalide-respiring bacteria (OHRB) in CH-HM-contaminated soil collected from a former electroplating plant. The two pollutant types exhibited distinct vertical spatial distributions. Soil bacterial communities were affected primarily by depth, followed by soil texture and pollutant concentration. TCE, VC, chromium, zinc, nickel, and Cr6+ levels in the soil were key factors influencing the relative abundance of bacterial phyla. However, the abundance of OHRB (Geobacter) was more indicative of CH contamination than of HM presence. Moreover, soil bacterial functions across different depths, textures, and pollutant concentrations showed no significant differences. The bacterial network was divided into 20 modules, with cooperative (positive) interactions outnumbering competitive (negative) interactions. In total, four bacterial genera within Proteobacteria played a key role in this co-contaminated environment. Findings provide a scientific basis for developing bioremediation strategies for sites affected by CHs and HMs. Https://www.sciencedirect.com/science/article/pii/S096483052500215X/pdfft?md5=ca56e30de34da9413e7ee0499739a03e&pid=1-s2.0-S096483052500215X-main.pdf

MONITORING HEAT TRANSFER AND RECHARGE MECHANISMS IN A KARST SYSTEM USING FIBER OPTIC DISTRIBUTED TEMPERATURE SENSING [Research]

Tue, 28 Jul 2026 19:25:48 GMT

Nader, A.A., J. Albaric, J.-P. Malet, M. Steinmann, K. Susanto, J. Ducasse, G. Ferhat, H. Celle, B. Pohl, J. Labbe, C. Sue, C. Fontaine, M. Bertin, and A. Boetsch. Groundwater 64(3):363-374(2026)

An 800-m-long fiber-optic cable was deployed within the unsaturated zone of a karst system in the Jura Mountains (eastern France) to investigate the spatial and temporal variability of cavity air and underground river water temperatures over a 6-month monitoring period. Results highlight a gradual increase in cavity air temperature and cavity river temperature over the study period, consistent with the diffusion of surface air temperature. Superimposed on this long-term influence, short-term temperature fluctuations linked to precipitation events reveal the role of advective heat transfer associated with rapid infiltration and mixing in the main conduit. Temperature and electrical conductivity contrasts between the underground river and a lateral tributary indicate that multiple reservoirs contribute to aquifer recharge.

EFFECT OF MODERATE HEAT ON TCE REDUCTIVE DECHLORINATION RATES IN GROUNDWATER [Research]

Tue, 28 Jul 2026 19:25:30 GMT

Freedman, D.L., N. Cotter, C. Divine, and S. Justicia-Leone.
Groundwater Monitoring & Remediation 46(2):44-54(2026)

A study evaluated the effect of temperature on the kinetics of TCE dechlorination. Groundwater and soil samples were collected from a site in southern California undergoing biostimulation treatment for a plume consisting of TCE and other chlorinated volatile organic compounds (VOCs) and where a Thermal In Situ Sustainable Remediation (TISR®) field test is being conducted. Microcosms were prepared in an anaerobic chamber with ~92 g of wet sediment and ~93 mL of groundwater with ~5.4 mg/L of TCE. Treatments included unamended and lactate-amended microcosms incubated at 18, 25, 30, 35, 40, and 50°C. For the unamended microcosms, activity was limited to TCE reduction to cDCE, indicating that at the time and location of sample collection, the aquifer was electron donor limited. The first-order rate of TCE reduction to cDCE increased by ~6-fold from 0.078/d at 18°C to 0.48/d at 25°C and then declined to <0.11/d at temperatures ≥30°C. Complete dechlorination of TCE to ethene occurred for lactate-amended treatment. First-order dechlorination rate constants were determined based on a chloride mass balance. The rate constants increased ~2.5-fold from 0.12/d at 18°C to 0.30/d at 25°C, and 3.8-fold from 18°C to 0.46/d at 35°C. No dechlorination occurred at 40 or 50°C. Molecular analysis of the lactate-amended microcosms confirmed the presence of microbes capable of TCE reduction to cDCE (e.g., Desulfitobacterium and Dehalobacter) and complete reduction of TCE to ethene (Dehalococcoides and Dehalogenimonas), as well as the genes for key dehalogenases (PCE Reductase, tceA Reductase, and Vinyl Chloride Reductase). Results confirm the potential for significant improvements to the rate of complete biotic reductive dechlorination of TCE in response to moderate heating and biostimulation of an aquifer. Https://ngwa.onlinelibrary.wiley.com/doi/epdf/10.1111/gwmr.70032

EVALUATING DUPLICATE RESULTS DEMONSTRATES DIFFERENCES BETWEEN DIRECT AND CANISTER SAMPLING METHODS [Research]

Tue, 28 Jul 2026 19:25:16 GMT

Kullmann, J.A.P. and I. Polenghi-Gross.
Groundwater Monitoring & Remediation 46(2):22-32(2026)

A study used field duplicate results to assess whether VOC samples collected with reusable summa canisters exhibit carryover contamination compared with samples collected by direct sampling methods (e.g., soil gas collected by mobile labs via dedicated tubing and syringes, or groundwater collected using disposable vials). This study used groundwater, soil gas, and indoor air datasets from samples collected between 2000 and 2024 from multiple project sites and analyzed by different labs. VOC data were evaluated by sampling method (direct or reusable canister), analytical method, and medium following a similar approach to one described in a prior study by McHugh et al. (2018). The evaluation included assessing the magnitude of the differences between primary and duplicate sample results by calculating percent differences and comparing the number of single-detect pairs versus non-detect pairs, which could be an indication of carryover contamination. Results showed that water samples collected using disposable vials and soil gas samples collected using direct sampling methods had greater precision (i.e., lower percent differences) and lower occurrences of single-detect pairs compared to soil gas or indoor air samples collected using evacuated canisters, confirming that reusable canisters may contain carryover contamination. Other factors contributing to uncertainty (i.e., low detected concentrations, sampling equipment certification process, quality control procedures, and laboratory best practices) were also considered to explain the discrepancies identified in this study.

DISSOLVED ORGANIC CARBON SOURCE IMPACT ON PERFLUOROALKYL SUBSTANCES REMOVAL FROM STORMWATER USING ACTIVATED CARBON AND ION EXCHANGE RESIN [Research]

Tue, 28 Jul 2026 19:24:57 GMT

Brown, C.A., J.T. Swenson, Y.-M. Cho, J.C. Pritchard, R.P. Milstead, C.K. Remucal, and R.G. Luthy. | Environmental Science & Technology 60(1):1063-1072(2026)

A study assessed the removal of six PFAS from synthetic stormwater with dissolved organic carbon (DOC) derived from straw and compost, which are representative materials observed in stormwater catch basins. Activated carbon (AC) and ion-exchange resin (IX) alone or in tandem were used to assess the impact of DOC on sorbent performance and lifetime. PFAS breakthrough profiles in column studies were used to model contaminant removal via a 1-D intraparticle pore diffusion model, which was then used to predict contaminant removal under varying environmental conditions. PFAS removal was least effective when biodegradable straw DOC was present, indicating larger kinetic limitations to sorption than nonbiodegradable compost DOC. Using AC and IX in combination shows additive improvements over using the sorbents individually. Modeled parameters from replicate tests show consistency in the predicted breakthrough. With 3 mg/L compost DOC and 80 cm/h face velocity, models show that 50-100 cm AC followed by 12.5-50 cm IX provides long-term PFAS removal, ca. 10 years or 90,000 empty bed volumes. Https://pubs.acs.org/doi/pdf/10.1021/acs.est.5c08255?ref=article_openPDF

PATHWAYS FOR THE MINERALIZATION OF PERFLUOROOCTANESULFONIC ACID UNDER A SMOLDERING REDUCTIVE ATMOSPHERE [Research]

Tue, 28 Jul 2026 19:24:40 GMT

Zhan, M., Z. Zhang, Y. Shan, J. Fu, P. Cai, and W. Jiao.
Environmental Science & Technology 60(4):3668-3680(2026)

PFOS smoldering degradation pathways and relative bond cleavage mechanisms were deduced from lab-scale byproduct profiles and supported by reactive force field simulations and quantum-chemical calculations. Smoldering was self-sustained at a calorific value of 0.79 MJ/kg and an air Darcy velocity of 1.5-2.5 cm/s. The PFOS removal rate reached 98.1%, with only ∼50% energy consumption compared with that of conventional incineration under equivalent degradation conditions. Investigations revealed distinct degradation pathways in smoldering compared with traditional approaches: in a CO atmosphere, early C-C bond scission and CO-coupled sulfur transformation were predicted (potentially evolving toward COS). This pathway played a dominant role in PFOS degradation, providing more efficient sulfur-group transformation, less toxic byproducts, and better compatibility with oxygen-limited conditions. Pilot-scale experiments further validated the feasibility for field applications, achieving 98.6% PFOS removal. Findings provide mechanistic insights into improved smoldering-based PFAS remediation under reductive conditions and optimization of treatment strategies toward higher efficiency and environmental safety.

BIOREMEDIATION OF CVOC CONTAMINATION IN THE SUBSURFACE OF UTRECHT, THE NETHERLANDS, AND ITS INTERACTION WITH AQUIFER THERMAL ENERGY STORAGE TO PROTECT DRINKING WATER SOURCES [Demonstrations]

Tue, 28 Jul 2026 19:24:19 GMT

van Ras, N., M. Henssen, and T. Grotenhuis. Frontiers in Water 8:1771734(2026)

Aquifer Thermal Energy Storage (ATES), a new sustainable energy technology, was combined with in situ bioremediation (ISB) into RemediaTES. Lab and pilot studies at the municipality of Utrecht, the Netherlands, were combined to demonstrate the effectiveness of the proposed combination of technologies. At this site, relatively high concentrations of CVOC are present (mainly cis-DCE and VC with concentrations up to ~1,800 and 1,600 µg/L, respectively). The pilot started with groundwater circulation. A groundwater extraction and an infiltration well were installed within the contaminated area. Between the wells, several injection and monitoring wells were installed to infiltrate a concentrated DHC culture or a slow-release carbon source and to monitor the degradation process. A volume of 8 m³ of DHC culture was cultivated using a mobile TCE system and injected into the pilot area. By applying a pumping flow rate of approximately 4-6 m³/day, the retention time in the bioactive zone was reduced from 2.5 months to ~2-4 days, which is more representative of the retention time in RemediaTES applications. Monitoring included periodic groundwater sampling and analyses for CVOCs and degradation products ethene and ethane, molecular DNA analysis to investigate the development and migration of DHC, and Membrane Filtration Index (MFI) to determine the number of particles (inorganic and bacterial) in the groundwater. Results showed that a generally applicable area-oriented strategy that focuses on preventing CVOC transport to the receptor is most cost-effective in the long term. The combined technologies have the potential to become a breakthrough in the redevelopment of contaminated sites. This article is Open Access at https://www.frontiersin.org/journals/water/articles/10.3389/frwa.2026.1771734/full

INTEGRATED THERMAL AND BIOSTIMULANT ENHANCED BIOREMEDIATION OF CAHS AND BTEX CO-CONTAMINANTS IN GROUNDWATER: CHEMICAL AND MOLECULAR EVIDENCE IN LABORATORY AND PILOT-SCALE STUDIES [Demonstrations]

Tue, 28 Jul 2026 19:23:56 GMT

Zhang, Z., Q. Wang, X. Liu, X. Zhang, and X. Song. Water Research 297:125751(2026)

A series of lab microcosm experiments and a pilot-scale study were conducted to evaluate the performance of integrated thermal and biostimulant-enhanced bioremediation (ITBEB) to treat groundwater co-contaminated with chlorinated aliphatic hydrocarbons (CAHs) and BTEX. The microcosm results showed that compared to the control groups at 15 °C without biostimulation, ITBEB using emulsified vegetable oil (EVO) at 30°C increased the TCE dechlorination rate by 2.2-fold, while cDCE stalling occurred; however, benzene degradation efficiency was not significantly improved. Both TCE and benzene biodegradation were inhibited at 45°C. Upon shifting back to room temperature, TCE degradation recovered, whereas benzene degradation did not, likely due to differential thermal tolerance between organohalide-respiring and benzene-degrading microorganisms. In contrast, the pilot-scale study demonstrated that simultaneous CAH and BTEX biodegradation was achieved following EVO amendment and aquifer heating to the target temperature range of 35-40°C via electrical resistive heating. cDCE stalling was alleviated in situ, as evidenced by VC and ethene formation, accompanied by the markedly elevated ratio of abundances of vcrA to Dhc 16S rRNA gene, providing strong molecular support for complete reductive dechlorination. Concurrently, rapid BTEX biodegradation was observed under optimal thermal conditions and was closely linked to iron- and sulfate-reduction. However, BTEX removal efficiency reached a plateau during the later heating stage, owing to electron acceptor depletion and thermal inhibition of sulfate- and iron-reducing activities. In addition, the dominating bacteria shifted from contaminant-degrading genera Sulfurospirillum and Pseudomonas to a fermentative group following EVO injection, then to thermophilic taxa after aquifer heating. The study demonstrated that ITBEB can effectively promote the biodegradation of CAHs and BTEX in co-contaminated groundwater when TOC amendment was coupled with moderate thermal stimulation.

IS A LINEAR LOW-DENSITY POLYETHYLENE PASSIVE SAMPLER SUITABLE FOR LONG-TERM MONITORING OF POLYCYCLIC AROMATIC HYDROCARBONS IN SEAWATER? A CASE STUDY OF MASAN BAY WITH BIOAVAILABILITY ASSESSMENT [Demonstrations]

Tue, 28 Jul 2026 19:17:35 GMT

Kim, N.Y., H. Jung, M. Kang, and G.B. Kim. Environmental Pollution 397:127987(2026)

Masan Bay, a semi-enclosed industrial embayment in South Korea, has been continuously impacted by urban and industrial inputs of PAHs. Although passive samplers are widely used to determine freely dissolved concentrations, the long-term applicability of linear low-density polyethylene (LLDPE) in marine environments has not been systematically evaluated. To address this gap, LLDPE and low-density polyethylene (LDPE) were simultaneously deployed for 7 months at Samgwi (SG) and Yangdeok (YD) to determine time-weighted average concentrations (CTWA) and seasonal variability. CTWA values ranged from 1.2 to 6.5 ng/L at SG and from 2.0 to 6.7 ng/L at YD. Seasonal contributions of individual PAHs showed no substantial differences between the two samplers. Compared with previous studies, sediment PAH concentrations exhibited a declining trend. Porewater concentrations ranged from 1.5 to 16 ng/L and did not exceed toxicity-based benchmarks. Diffusive fluxes were predominantly directed from sediments to the overlying seawater. Findings demonstrate that LLDPE can be effectively applied alongside LDPE for long-term monitoring of PAHs and indicate relatively low ecological risk under current conditions in Masan Bay. Https://www.sciencedirect.com/science/article/pii/S026974912600357X/pdfft?md5=53671b5538a0872ebb68905efda7c09c&pid=1-s2.0-S026974912600357X-main.pdf

MANAGING REMEDIATION RISK THROUGH MULTI-CRITERIA DECISION MAKING [Cleanup News]

Tue, 28 Jul 2026 19:17:21 GMT

Cole, J. | DCHWS West 2025 Winter Symposium, 26-28 January, Denver, CO, 17 slides, 2026

This presentation describes how a multi-criteria decision-making framework can reduce technical and financial risk by integrating multiple lines of evidence to determine when the capacity of ISTT to remove contaminants from soil or groundwater has been reached. Using the Arrowhead Superfund site as a case study, the presentation illustrates how operational data were combined to support defensible and cost-effective system shutdown decisions. The design and performance of an electrical resistance heating remedy that incorporated co-located vapor extraction, groundwater monitoring, and comprehensive temperature monitoring to achieve treatment objectives, including contaminant removal, hydraulic and pneumatic control, and subsurface heating targets, is reviewed. Multiple performance indicators, including contaminant mass recovery, temperature distribution, energy input, vapor recovery, and groundwater concentration trends, were evaluated throughout system operation to determine when contaminant removal had reached an asymptotic rate and additional heating would provide diminishing returns. Results demonstrated that contaminant recovery plateaued despite maintaining target temperatures, indicating that the practical treatment capacity of the system had been achieved. Lessons learned emphasize the value of incorporating endpoint decision criteria during remedy planning, engaging stakeholders early in the design process, and using readily available operational data to support transparent, technically defensible decisions. Practical guidance is provided for applying multi-criteria decision-making frameworks to optimize ISTT performance, minimize unnecessary energy consumption, and improve risk management during thermal remediation projects. Https://mediacdn.guidebook.com/upload/213717/6tPrwutYpDkRhA3gU2zkscXBjWRuFUQdzMI7.pdf

REMEDY RESILIENCY IN THE RD/RA FOR THE WHITE SWAN/SUN CLEANERS AREA GROUNDWATER CONTAMINATION SUPERFUND SITE [Cleanup News]

Tue, 28 Jul 2026 19:17:04 GMT

Khan, M. | DCHWS West 2025 Winter Symposium, 26-28 January, Denver, CO, 17 slides, 2026

This presentation examines the evolution of the groundwater remedy at the White Swan/Sun Cleaners Area Groundwater Contamination Superfund site in New Jersey, highlighting how design modifications improved constructability, resiliency, and implementation efficiency without compromising remedial performance. It reviews the site's history, major remediation milestones, and the transition from the original 2020 remedial design to the revised 2024 design. Key engineering modifications, including replacing conventional trenching with horizontal directional drilling, transitioning from a traditional treatment facility to a modular groundwater treatment plant, optimizing extraction and treatment system components, and streamlining construction sequencing, are discussed in detail. Side-by-side comparisons illustrate how these revisions reduced construction duration, minimized community disruption, improved operational flexibility, and enhanced long-term system reliability. The presentation emphasizes proactive stakeholder communication and resilient engineering solutions during implementation. Https://mediacdn.guidebook.com/upload/213717/7W0fXGWDtUEGlsnRAEHsrHWfd6JpC4KY9C20.pdf

COMBINED ISTR TECHNOLOGIES AT FOUR RECENT FUND LEAD SUPERFUND SITES [Cleanup News]

Tue, 28 Jul 2026 19:16:45 GMT

Hauber, E. | DCHWS West 2025 Winter Symposium, 26-28 January, Denver, CO, 22 slides, 2026

This presentation highlights the successful application of combined ISTR technologies at four Superfund sites, demonstrating how integrated thermal treatment approaches can overcome challenging subsurface conditions and accelerate contaminant mass removal. The design, implementation, and performance of multiple ISTR technologies, including electrical resistance heating, thermal conductive heating, and steam-enhanced extraction, used individually or in combination to address chlorinated solvents, coal tar, creosote, and other recalcitrant contaminants, are examined. Case studies illustrate how remedy selection was tailored to varying geologic settings, contaminant distributions, and cleanup objectives while integrating complementary technologies, such as soil vapor extraction, multiphase extraction, groundwater recovery, and vapor treatment systems. Results from each project are presented, including contaminant mass removal, achievement of remedial goals, construction considerations, system optimization, and transition to post-treatment management. The presentation also discusses lessons learned related to remedy design, stakeholder coordination, performance monitoring, and risk reduction, emphasizing the advantages of combining multiple thermal technologies to maximize treatment efficiency, while minimizing long-term remediation timeframes. Practical insights into the planning, implementation, and performance of integrated ISTR remedies are provided that can be applied to future complex Superfund source-area cleanups. Https://mediacdn.guidebook.com/upload/213717/ZGjZ6MvQtNYiZFyZlRoik9Y5I7KKfF0gRiDB.pdf

INDEFINITE-DELIVERY/INDEFINITE-QUANTITY (ID/IQ) SMALL BUSINESS ENVIRONMENTAL REMEDIAL ACTION CONTRACT FOR SITES IN HAWAII, GUAM, AND OTHER AREAS WITHIN THE NAVAL FACILITIES ENGINEERING SYSTEMS COMMAND PACIFIC AREA OF RESPONSIBILITY VI (SBRAC VI) (SOL) [Market/Commercialization]

Tue, 28 Jul 2026 19:16:24 GMT

U.S. Department of the Navy, NAVFAC Pacific Command, Joint Base Pearl Harbor-Hickam, HI
Opportunities on SAM.gov N62742-26-R-1801, 2026

This is a total small business set-aside under NAICS code 562910. The Naval Facilities Engineering Systems Command (NAVFAC) Pacific seeks a contractor to perform remedial actions at environmentally contaminated sites, predominantly located at Navy and Marine Corps installations and other Government agency sites. The sites will consist of those ranked on the Superfund NPL and non-NPL sites and Base Realignment and Closure sites regulated under CERCLA, RCRA, UST regulations, state-specific regulations, and other sites that might require remedial action. The work to be ordered under this contract will be performed at various locations within the NAVFAC Pacific area of responsibility (AOR). Work may also be added and performed anywhere outside of the NAVFAC Pacific AOR, as required by the Government. The exact location of the required effort will be specified in the individual Contract Task Orders. The Contractor may also, on occasion, be tasked to perform work for other NAVFAC Components, DoD, or federal agencies as required by the Government. This contract may include work on private, county, or state lands that are associated with the environmental sites identified above. Contaminants to be addressed are predominantly solvents, petroleum, oils and lubricants, metals, acids, bases, reactives, non-explosive ordnance residues or compounds, PAHs, PCBs, PFAS, MEC (including all types of discarded military munitions and unexploded ordnance), emerging contaminants, pesticides, and G-RAM. Contaminants may be present in soils, marine or freshwater sediments, groundwater, air, sludge, surface water, and manmade structures. Contaminated sites include, but are not limited to, landfills, hazardous waste treatment, storage and disposal facilities, tanks, lagoons, firefighting training areas, and small arms ranges. The Contractor must have anti-terrorist/force protection hazardous material release incident response and remediation capabilities. This includes the capability to assist with or conduct decontamination following a release of ATFP-related hazardous materials such as anthrax or any chemical, biological, or radiological agent. Work may include emergency or expedited contamination assessment and subsequent decontamination and remediation before returning facilities to normal operations, as well as preparing work plans and coordinating with applicable agencies. Task order values will range from $5,000 to $100,000,000. The period of performance will be five years. Offers are due by 2:00 PM HST on September 9, 2026. https://sam.gov/workspace/contract/opp/c421505c230f4196a2f5a3298dee424a/view

C -- ARCHITECT-ENGINEER (AE) SERVICES TO SUPPORT HAZARDOUS, TOXIC, AND RADIOACTIVE WASTE (HTRW) MULTIPLE AWARD TASK ORDER CONTRACT (MATOC) (COMBINE) [Market/Commercialization]

Tue, 28 Jul 2026 19:16:06 GMT

U.S. Army Corps of Engineers, South Atlantic Engineer Division, Mobile District, Mobile, AL
Opportunities on SAM.gov W9127826RA018, 2026

This is a full and open competition under NAICS code 541330. The U.S. Army Corps of Engineers Mobile District, requires a qualified contractor to support a full range of Architect and Engineering (AE) services for the Mobile District's Environmental Restoration Program. AE services will be performed primarily within Mobile District's Area of Responsibility (AOR), but will also include Central and South America, Puerto Rico, and the U.S. Virgin Islands. AE services may also be used to support the Environmental Response Program outside of the Mobile District's AOR. The services provided will include a full range of comprehensive support environmental services. The services will include analyzing and evaluating environmental regulations for implementing studies, designs, and program initiatives; providing comprehensive programmatic support of policies, guidance and regulations for various stakeholders and agencies; Hazardous, Toxic, and Radioactive Waste (HTRW) investigations and studies; remedial design; feasibility study, proposed plan, public meeting, and record of decision; vapor intrusion investigation and/or vapor intrusion remedial design; pilot study and/or bench study site investigations/assessments; treatability studies; pilot studies; risk assessments; sampling and analyses; data validation; electronic data management; geotechnical investigations; monitoring well installation; groundwater modeling; groundwater and surface water quality assessments; water reuse initiatives; vapor intrusion monitoring, assessment and modeling; environmental site assessments; surveys/inspections for asbestos, leaded paint, and other HTRW materials; and investigation/study/assessment of emerging contaminants such as per and polyfluoroalkyl substances (PFAS). The USACE intends to award an AE MATOC with a shared capacity of $249M and an ordering period of five years with up to two option years. Offers are due by 2:00 PM CDT on July 30, 2026. https://sam.gov/workspace/contract/opp/011a54ca654244799a912bbcbffae98e/view

MULTIDIMENSIONAL SYNERGISTIC MANAGEMENT OF ACID MINE DRAINAGE: CONSTRUCTING CLOSED-LOOP TECHNOLOGICAL SYSTEMS BRIDGING CONTAMINATION CONTROL AND RESOURCE CIRCULATION [General News]

Tue, 14 Jul 2026 18:38:08 GMT

Ma, Z., L. Zhou, S. Wang, S. Zhu, Z. Zhao, R. Li, T. Wang, and H. Guo.
Journal of Water Process Engineering 78:108782(20265

A systematic review was conducted on recent research progress in the field of AMD treatment, with a focus on the transition from traditional treatment technologies to integrated resource recovery and comprehensive management models. Guided by the principles of a circular economy, the review constructed a tripartite technical system encompassing "pollution control-resource recovery-ecological restoration" and provided a detailed analysis of the synergistic mechanisms of key technologies such as physicochemical treatment, bioremediation, and the application of novel functional materials. The review thoroughly examined the principles and effectiveness of advanced technologies like selective adsorption, membrane separation, and bioelectrochemical systems in AMD treatment, while outlining optimization pathways for multi-technology coupling systems. It also analyzed current challenges in practical applications, including water quality complexity and operational stability, and explored future development directions such as intelligent monitoring and the development of new functional materials. Https://www.sciencedirect.com/science/article/pii/S2214714425018550/pdfft?md5=d2c3e69675a273be77c992a4c3c229bc&pid=1-s2.0-S2214714425018550-main.pdf

EXTREMOPHILE RED ALGAE FOR ACID MINE WASTE REMEDIATION: A DESIGN-FORWARD REVIEW FOCUSED ON GALDIERIA SULPHURARIA [General News]

Tue, 14 Jul 2026 18:36:39 GMT

Sivanantharajah, S., K. Sriram, M. Sivanesarajah, S. Nadesananthan and T. Selvaratnam.
Processes 14(3):417(2026)

Thermoacidophilic red algae of the order Cyanidiales, particularly Galdieria sulphuraria (G. sulphuraria), have attracted interest as a biological option to remediate acid mine drainage (AMD) because they tolerate extreme acidity and elevated temperatures, grow under low light in mixotrophic or heterotrophic modes, and display rapid metal binding at the cell surface. This review synthesizes 20 years of peer-reviewed work to clarify how G. sulphuraria can be deployed as a practical module within mine water treatment trains. It examines the mechanisms of biosorption and bioaccumulation and shows how they map onto two distinct configurations. Processed freeze-dried biomass functions as a regenerable sorbent for rare earth elements (REEs) and selected transition metals in packed beds with acid elution for recovery. Living cultures serve as polishing units for divalent metals and, when present, nutrients or dissolved organics under low light. Realistic operating windows centered on pH 2-5 and temperatures of approximately 25-45°C are defined. Matrix effects that govern success are identified, including competition from ferric iron and aluminum, turbidity and fouling risks, ionic strength from sulfate, and suppression of REE uptake by phosphate in living systems. Building on lab studies, industrial leachate tests, and ecosystem observations, the review proposes placing G. sulphuraria upstream of bulk neutralization and outlines reporting practices that enable cross-site comparison. The goal is an actionable framework that reduces reagent use and sludge generation while enabling metal capture and potential recovery of valuable metals from mine-influenced waters. This article is Open Access at https://www.mdpi.com/2227-9717/14/3/417.

SUSTAINABLE REMEDIATION OF ACID MINE DRAINAGE USING COAL FLY ASH: A COMPREHENSIVE REVIEW AND BIBLIOMETRIC ANALYSIS [General News]

Tue, 14 Jul 2026 18:36:23 GMT

Mogashane, T.M., A.M. Motlatle, B.N. Mosoma, L. Mokoena, and J. Tshilongo.
Chemical Engineering Journal Advances 25:101047(2026)

This review analyzes current developments in using coal fly ash (CFA) for acid mine drainage (AMD) remediation, emphasizing its physicochemical characteristics, pollutant removal methods, and performance-enhancing changes. Key findings from experimental and pilot-scale studies show that CFA can effectively neutralize acidic pH, removing ≤ 99% of heavy metals and precipitate sulphates through adsorption and co-precipitation processes. Modified CFA materials, including those treated with acids, bases, or nanomaterials, further enhance removal efficiencies and broaden application potential. Challenges related to CFA variability, long-term stability of treated effluents, and potential secondary pollution are discussed. The integration of CFA into sustainable AMD management frameworks is also explored, along with emerging innovations such as CFA-based composites and combined treatment systems. A bibliometric analysis identified key trends in research production. https://www.sciencedirect.com/science/article/pii/S2666821126000165/pdfft?md5=53d6bf2435084de7118d7bbf5b0fff38&pid=1-s2.0-S2666821126000165-main.pdf

CRITICAL-MINERALS RECOVERY FROM MINE TAILINGS: A TECHNICAL REVIEW AND STRATEGIC ASSESSMENT [General News]

Tue, 14 Jul 2026 18:36:03 GMT

Podgorney, R., T. McLing, A. Nickens, S. Bragg-Sitton, and J. Wagner. Idaho National Laboratory Report INL/RPT-25-89279, 66 pp, 2025

This report presents a comprehensive technical assessment of the billions of tons of mine tailings generated by more than a century of hardrock mining across the U.S. The tailings contain recoverable quantities of critical minerals that were either not economically valuable during mining operations or technically difficult to extract with past-generation processing technologies. Recent efforts documented >300 datasets from more than 100 sources characterizing these tailings. Preliminary analysis indicates that domestic mine tailings contain ~ 13,904 MMT of material across 189 sites, with significant concentrations of critical minerals as REEs. The diverse deposit types of these tailings provide multiple pathways to develop domestic critical-mineral supplies from secondary sources. Many legacy tailings sites represent ongoing pollution sources through acid mine drainage, heavy-metal leaching, and dust generation. Reprocessing these materials offers the opportunity to simultaneously extract valuable minerals and remediate environmental hazards. However, significant barriers impede large-scale development of critical-mineral recovery from mine tailings, including incomplete site characterization; the absence of a comprehensive, standardized national database of tailings sites with verified critical-mineral content that creates uncertainty for private-sector developers; long permitting timelines; and liability concerns under CERCLA. Economic barriers include the technical complexity of separating multiple critical minerals from complex matrices, volatile commodity prices that create investment risk, and the high upfront capital requirements of processing facilities capable of handling large material volumes necessary to achieve economies of scale. The phenomenon of "companionality" in which 61% of evaluated metals are produced primarily as byproducts rather than as primary commodities, further complicates supply dynamics. Https://inl.gov/content/uploads/2026/04/INL-RPT-25-89279.pdf

APPLICATION OF X-RAY-TOMOGRAPHY AND GEOCHEMICAL MODELING TO OPTIMIZE AMD TREATMENT DESIGN USING DAS AT A FORMER TIN MINE SITE IN FRANCE [Research]

Tue, 14 Jul 2026 18:35:47 GMT

Rhino, K., J. Jacob, A. Lassin, F. Dure, J. Engevin, J. Huron, V. Guerin.
Proceedings from the International Mine Water Association Conference, 7-11 July, Braga, Portugal and Oviedo, Spain, 7-11 July, 2025

First pilot-scale trials of dispersed alkaline substrate (DAS) reactors to treat acid mine drainage (AMD) at a closed Sn mine in Abbaretz, France revealed notable iron precipitation and clogging over time. To address this, a fixed-bed limestone reactor was used to estimate precipitate volume via X-ray tomography, linking iron precipitation to porosity reduction. A second DAS reactor was conducted, and a geochemical model, developed with PHREEQC, was used to simulate calcite dissolution, AMD neutralization, and iron hydroxide precipitation under varying residence times. DAS results aligned with experimental data, offered insights into DAS efficiency and lifespan, and helped identify the main mechanisms that control the fate of iron and metals at the different stages of the process. Findings inform the design of robust passive treatment systems for long-term AMD management. Https://www.imwa.info/docs/imwa_2025/IMWA2025_Rhino_813.pdf

TOWARDS SUSTAINABLE RECOVERY OF RARE EARTH ELEMENTS FROM ACIDIC MINE WATERS: A CIRCULAR TREATMENT APPROACH INTEGRATING SELECTIVE PRECIPITATION AND ION EXCHANGE [Research]

Tue, 14 Jul 2026 18:35:29 GMT

Roa, A., J. Lopez, and J.L. Cortina.
Proceedings from the International Mine Water Association Conference, 7-11 July, Braga, Portugal and Oviedo, Spain, 7-11 July, 2025

A study introduces a sustainable, circular approach for treating acidic mine waters (AMWs), focusing on recovering valuable rare earth elements and other critical raw materials (CRMs). Using AMWs from the Aznalcollar Open Pit in southwestern Spain, metals like Fe, Al, and Zn were removed through precipitation and sulfide formation, achieving >99% efficiency. Ion exchange resins separated heavy and light REEs, which were recovered as >90% pure oxalates. This eco-friendly process minimizes sludge, mitigates pollution, and supports CRM demand, demonstrating global applicability. Https://www.imwa.info/docs/imwa_2025/IMWA2025_Roa_819.pdf

NUMERICAL MODEL-GUIDED OPTIMIZATION FOR REMEDIATION OF HIGH-FLUORINE ACID MINE DRAINAGE IN A LARGE-DEEP MINE PIT [Research]

Tue, 14 Jul 2026 18:34:27 GMT

LI, Y., Y. DU, H. Xu, A. Yan, S. Zhao, Z. Huang, and L. Wang.
Environmental Earth Sciences 85:4(2026)

Conventional remediation of high fluoride and high acid mine drainage in one of the deepest and largest abandoned mine pits in eastern China was challenging due to its immense volume and vertical stratification and was estimated to take several years through pilot testing and monitoring. An Integrated Treatment Station (ITS), consisting of a pump and dosing tank, was designed to promote vertical mixing, with deep water being drawn to the surface by the pump and supplemented by an appropriate amount of neutralizer being added in the dosing tank, and then sprayed nearby. A 3D k-ε hydrodynamic coupled water exchange model was established to predict the feasibility and optimality of the solution and was also used to track the efficiency of the real treatment operation. The first scheme, V1, involved a few high-capacity land-based ITS, while V2 employed many low-capacity floating ITS, and V3 used a moderate number of low-capacity floating ITS, deployed in varying areas depending on the bathymetry. Based on simulation results, after running V1, V2, and V3 schemes for 3 months, the water exchange efficiency of the total alkaline addition reached 71.37%, 76.18%, and 81.56%, respectively, meeting the efficiency requirements for AMD treatment. During the operation of the selected V3 scheme, the fluoride ion levels in the surface and bottom layers were monitored synchronously to assess the effectiveness of the treatment. The total fluoride ion concentration showed a remarkable logarithmic decrease, with surface, bottom, and total water body levels following a consistent downward trajectory, as predicted by the model. Using the model simulation reduced the trial and error, increased the remediation efficiency, and decreased the treatment time. Within ~ one year, the water had substantially achieved treatment objectives.

INNOVATIVE PILOT-SCALE PROCESS FOR SUSTAINABLE RARE EARTH OXIDE PRODUCTION FROM COAL BYPRODUCTS: A COMPREHENSIVE ENVIRONMENTAL IMPACT ASSESSMENT [Research]

Tue, 14 Jul 2026 18:34:15 GMT

Rabbani, M., J. Werner, A. Fahimi, and E. Vahidi. Journal of Rare Earths 43(2):397-404(2025)

A pilot-scale process feeding was developed with two different materials from a column leaching process and acid mine drainage streams to recover rare earth elements (REEs). A life cycle assessment study evaluated the environmental impacts of rare earth production from deleterious material in the form of highly contaminated leachate (HCL) and low-contaminated leachate (LCL). Results indicate that the main contributors to environmental categories that produce RE-hydroxide stages are NaOH and electricity. Oxalic acid, Na₂CO₃, and hydrochloric acid significantly contribute to the production stage of individual rare earth oxides (REOs), including solvent extraction (SX) and precipitation steps. The HCL route has higher environmental impacts than LCL due to higher chemical/energy and H2SO4 usage; 468 and 292 kg of carbon dioxide were generated to produce 1 t of individual REOs from the HCl and LCL routes, respectively. Carbon dioxide emitted from the process, including the RE-hydroxide production, SX, and REOs production, was less than 10 t CO₂. A sensitivity analysis was performed to assess the changeability of the environmental footprints of the main inputs in the SX process, as the main stage has a higher contribution to the whole process. Https://www.sciencedirect.com/science/article/pii/S100207212400108X?casa_token=gYNcZaQ43ycAAAAA:M_k4GsRq7SCrVRihjYuVvyZHeqjM48jf86hKXEj_gcxykdOBoXcN24e9rxtoWuF20FdWooYVpA

APPLICATION OF UNSUPERVISED MACHINE LEARNING TO REFINE SPATIAL DISTRIBUTIONS OF TRACE METAL AND METALLOID SOIL CONTAMINATION AT THE HISTORIC CRONIN MINE [Research]

Tue, 14 Jul 2026 18:32:15 GMT

Novakowski, K., N. Logan, C. Thomas, and P. Garvey. | British Columbia Technical and Research Committee on Reclamation, 22-25 September, Penticton, British Columbia, 13 pp, 2025

The Cronin Mine, located ~30 km northeast of Smithers, B.C., was primarily used to mine silver, lead, and zinc. The Upper Mine comprises the former mine workings and waste rock deposits, while the Lower Mine comprises the former concentrator mill site and tailings deposits. The most recent investigation focused on the Upper Mine. Situated at elevation(s) ranging from 1,440 to 1,830 m above sea level, the area is characterized by steep mountainous terrain and exposed bedrock. A major challenge in investigating the Upper Mine was distinguishing between elevated metals and metalloids in soil due to historic mining activities versus naturally elevated background concentrations from localized mineralization and the physical weathering of the exposed bedrock. Preliminary site investigations to define the spatial distribution(s) of elevated metals and metalloids in soil resulted in identifying areas that extended beyond the footprint of former mine activities and were too large to physically remediate. Recently, unsupervised machine learning methods combined with multivariate analysis were identified as tools that could potentially be used to refine these spatial distributions. This paper describes how results of the unsupervised machine learning process provided a clear visualization of the spatial distribution of metals and metalloids concentrations in soil and a key tool to advance remedial planning. Https://open.library.ubc.ca/soa/cIRcle/collections/59367/items/1.0450902?o=4

IMPLEMENTATION OF (AIDED)PHYTOEXTRACTION IN PB/ZN MINE TAILINGS USING HYPERACCUMULATORS IMPROVES SOIL HEALTH [Research]

Tue, 14 Jul 2026 18:31:58 GMT

Alvarez-Lopez, V., B. Rodriguez-Garrido, A. Prieto-Fernandez, C. Trasar-Cepeda, C. Monterroso, and P. Kidd. | Chemosphere 394:144780(2025)

A field trial of (aided)phytoextraction was implemented at an abandoned Pb/Zn-mining area in northwestern Spain. The Cd/Zn-hyperaccumulator Noccaea caerulescens was planted in monoculture or co-cropped with the leguminous Lotus corniculatus in replicate plots established in non-amended or compost-amended mine tailings. Compost amendment improved soil properties such as total C and N contents, C/N ratio and nutrient availability, but decreased soil metal availability. Compost addition improved plant nutrition and biomass production of the hyperaccumulator. After 1.5 years of plant growth, no significant changes in soil total metal concentrations were observed. However, the concentrations of NH₄Cl-extractable Zn decreased in plots cultivated with N. caerulescens. Intercropping with the legume induced significant increases in shoot metal concentrations in the hyperaccumulator. Plant cover and compost addition increased the activity of hydrolytic and dehydrogenase enzymes, while decreasing catalase activity, which showed abnormally high values in mine tailings. The successful establishment of plant cover was essential to maintaining the improvement of organic matter and other soil properties induced by the compost amendment over time.

RESPONSES OF ARSENIC AND SOIL PROPERTIES TO REMEDIATION: EVIDENCE FROM A TWO-YEAR MONITORING STUDY IN AN ABANDONED GOLD MINING AREA [Demonstrations]

Tue, 14 Jul 2026 18:31:09 GMT

Tang, Z., L. Li, Y. Li, H. Chen, Y. Zhang, T. Hu, and Z. Hu.
Toxics 14(4):316(2026)

A two-year field monitoring program was conducted at a severely As-contaminated abandoned gold mine in Guangdong Province, China, to examine the temporal dynamics of soil properties and As behavior under different remediation strategies. Representative slopes included slope A (slope reshaping and revegetation), slope B (terraced engineering interception), and slope C (an area influenced by acidic water bodies). Both total and available As at slopes A and B exhibited a similar pattern of initial increase followed by decline and stabilization, indicating a clear temporal scale for remediation effects. Slope A exhibited greater spatial variability, whereas slope B showed relatively minor fluctuations, suggesting that terraced engineering measures contributed to enhanced As stability. In contrast, slope C had lower total As but a higher proportion of available As before remediation due to acidic conditions. Following remediation, total and available As at slope C decreased markedly and remained stable for about six months; however, a rebound trend was observed after ~1.5 years, indicating the time-limited effectiveness of passivation treatments. Total As at slope C decreased from 22,916 to 4,011 mg/kg, accompanied by a 65-85% reduction in available As. Meanwhile, soil pH, soil organic matter, and cation exchange capacity exhibited pronounced non-linear variations, with an overall tendency to recover toward pre-remediation conditions. This article is Open Access at https://www.mdpi.com/2305-6304/14/4/316

TREATMENT OF ACID MINE DRAINAGE (AMD) FROM THE SANTA CATARINA BASIN (BRAZIL) TO RETRIEVE RARE EARTH [Demonstrations]

Tue, 14 Jul 2026 18:30:55 GMT

Viola, V.O., T.F. de Aquino, B. Bonetti, L. Canarin, A.D. Cardoso, G. Clark Bleyer, K. Shirmer,
M. Nascimento, P.S.M. Soares, C. Soares, N. Padoin, and H.G. Riella.
Journal of Water Process Engineering 82:109549(2026)

A study evaluated the technical feasibility of producing a rare earth element-preconcentrate from coal AMD collected in the Santa Catarina coal basin. Three production scales were assessed at bench (18 L), glass reactor (100 L), and pilot plant scale (15 m3) using a sequential precipitation process based on controlled oxidation and pH adjustment. This approach generated two solid precipitates: the first with pH between 4.5 and 5.0 (P1), iron-rich (up to 56% Fe2O3), and the second with pH between 8.5 and 9.0 (P2), enriched with REEs (up to 2.5% by mass). Production results showed a yield of ~0.07 kg P2/cm3 of AMD treated. Solid P2 was subjected to acid leaching, followed by hydrometallurgical extraction and selective precipitation. The method recovered a REE-rich product with >90% purity, obtaining ~1 g of mixed rare earth oxide equivalent for every 3.6 m3 of AMD processed. Effluent quality demonstrates removal efficiencies >95% for Fe and Al, with reductions in Mn and Zn. Reproducibility across scales demonstrates the potential for industrial implementation. Https://www.sciencedirect.com/science/article/pii/S2214714426001078/pdfft?md5=928bb6945467bf0a7b466bc7a2116cb3&pid=1-s2.0-S2214714426001078-main.pdf

ADAPTATION OF THE ENVIRONMENTAL CLAMSHELL DREDGE FOR BITUMEN MAT REMEDIATION IN BASE MINE LAKE DEMONSTRATION [Demonstrations]

Tue, 14 Jul 2026 18:30:32 GMT

Adedeji, O.E., N. Wang, R. Young, D. Major, A. Dunmola, A. Lanoue, and M. London.
Tailings and Mine Waste 2025 Conference, 2-5 November, Banff, AB, Canada, 12 pp, 2025

The Base Mine Lake Demonstration (BML) is the oil sands industry's first full-scale commercial demonstration of water-capped tailings technology in an end pit lake. The closure method involves placing fine tailings (FT) below grade in a mined-out pit, then covering them with a water cap deep enough to prevent wind-driven resuspension of mineral solids, which allows the tailings to densify. Over time, the water layer on top of the tailings forms a lake that supports plants and animals. Since commissioning the BML in 2012, research and monitoring have shown that FT settlement occurs as expected through self-weight consolidation, water quality improves over time, and ecological communities develop. Bitumen mats have been found at the FT-water interface in certain areas of BML, which could impact lake performance. A 55-day field pilot program was conducted at BML to remediate bitumen mats during the open season. The goal was to demonstrate that the environmental clamshell dredge could effectively remove the mats from a soft-sediment water body, such as the BML, and assess the accuracy of the dredge bucket's position through surface surveys before and after dredging, using bathymetric data. A target depth of 40 cm from the mudline was established, which is within the 45 cm limit of the clamshell bucket. The pilot was successful, with the post-dredging surface averaging ~39 cm, close to the intended 40 cm. https://drive.google.com/file/d/1wKAxJ4PUX8ly050cHmoeQIgXGD0nOUtz/view

FIVE-YEAR PERFORMANCE REVIEW OF A MINE ROCK STOCKPILE COVER TRIAL IN THE CANADIAN SHIELD [Demonstrations]

Tue, 14 Jul 2026 18:30:14 GMT

Harrington, J., A. Cash, C. Mendoza, J. Straker, M. Iverson, V. Raizman, and M. Leclair.
Haagner, A. and F. van Wyk. Proceedings of the 18th International Conference on Mine Closure, 14 pp, 2025

The planned end land use for mine rock stockpiles at the Detour Lake Mine in Canada is dense mature coniferous forest to reestablish pre‐mine ecosystems. A 10‐hectare cover trial was constructed to assess the relative performance of different cover and revegetation prescriptions to achieve planned end land use. The trial was divided into plots considering a range of slope angles, aspect, cover thickness, surface grading and revegetation prescriptions. The paper reviews the cover trial performance after five years of monitoring. Large‐scale slope instabilities were not observed in the silt‐rich reclamation cover. Most erosional and depositional features stabilized three to four years following construction. The primary factors influencing erosion are variability in surface water run‐on from the upstream bench and surface grading on slopes, with lesser influence from slope angle and cover thickness. Erosion performance improved by limiting surface water run‐on to slopes by using a microtopography surface grading of offset hummocks and hollows plus rapidly establishing vegetation. The density of conifers was within the range required to achieve the planned end land use, although it neared the lower end of that range, with some ongoing mortality. Green alders were growing well and reaching heights >2 m. Peat was the key driver of seedling survival and vigor, where survival was ~25% higher in areas with increased peat. A 0.7 m cover thickness promoted vegetation growth and managed erosion. Insights into operational‐scale construction methods and the relative performance of cover characteristics are being applied to ongoing progressive reclamation activities. Https://papers.acg.uwa.edu.au/d/2515_98_Cash/98_Cash.pdf

MANGANESE REMOVAL IN A FULL-SCALE CONSTRUCTED WETLAND FOR PASSIVE MINE WATER TREATMENT: ENVIRONMENTAL FACTORS AND MICROBIAL COMMUNITIES [Cleanup News]

Tue, 14 Jul 2026 18:29:08 GMT

Lafont, C., S. Vaxelaire, A. Gelabert, C. Joulian, H. Thouin, F. Dure, M. Charron, J. Gorny, D. Vantelon, F. Battaglia-Brunet, and E.D. van Hullebusch.
Water Research 295:125539(2026)

Key biogeochemical factors influencing Mn removal were examined in a full-scale passive mine water treatment plant located in Ales, France. Monitoring physicochemical parameters, microbial communities, and Mn speciation in solid phases was conducted every two months for one year. Results highlight temporal variations in Mn removal efficiency, with two main mechanisms identified: (1) MnCO_₃ precipitation, likely influenced by high carbonate concentrations in mine water; and (2) Mn oxide (δ-MnO_₂) formation, mainly associated with reed rhizosphere, where it accumulates as mineral plaque. In mine water, Mn removal correlates with Fe particle concentrations, suggesting a catalytic effect, as well as with alkalinity and the abundance of microorganisms affiliated to Alteromonadaceae, suggesting a microbial influence. Mn removal appears to be primarily abiotic, driven by favorable pH and alkaline conditions that promote Mn carbonate precipitation, autocatalytic oxidation reactions occurring on rhizosphere surfaces, and the plant's design, including surface area and hydrological conditions. Https://www.sciencedirect.com/science/article/pii/S0043135426002216/pdfft?md5=92133d7b16447440fdbffcdd77002efc&pid=1-s2.0-S0043135426002216-main.pdf

LESSONS FROM FEASIBILITY AND CONCEPTUAL DESIGN STUDIES FOR A POTENTIAL GROUNDWATER UNDERDRAIN REMEDY NELSON TUNNEL/ COMMODORE WASTE ROCK SUPERFUND SITE COLORADO [Cleanup News]

Tue, 14 Jul 2026 18:28:55 GMT

Piestrzeniewicz, A. | DCHWS West 2025 Winter Symposium, 26-28 January, Denver, CO, 21 slides, 2026

The Nelson Tunnel/Commodore Waste Rock Superfund site consists of the abandoned Nelson Tunnel, associated historical mine workings, and mine tailings. Impacted mine water with elevated metals and low pH is impounded in three separate mine pools within the Nelson Tunnel and discharges at a consistent rate of ~350 gals/min through the collapsed tunnel portal and into adjacent West Willow Creek. The interim remedy consists of a new mine adit and flow control bulkhead to prevent release of ≤ 22 million gals of mine water. A key component will be controlling the flow of water into the tunnel before remediating the impacted mine water. Constant discharge of water from the portal and evidence from previously collected data suggest primary input of water into the tunnel may be upwelling groundwater along the Amethyst Fault and associated fractured rock. Lessons learned from a recently completed treatability and conceptual design study support a potential groundwater underdrain. The main objectives were to evaluate the location and rate of groundwater upwelling into the Nelson Tunnel to confirm it is the dominant source of water influx and inform the conceptual design, and assess groundwater quality to determine whether it meets applicable water quality standards for surface water discharge without requiring costly treatment. Two angled boreholes within the Commodore 5 Level Tunnel revealed potential new groundwater flow paths not in the conceptual site model, offering critical data for the final remedy selection and design. The presentation describes the various challenges and implementation factors associated with mobilizing and operating equipment in a narrow underground tunnel within a remote and steep mountain canyon. Https://mediacdn.guidebook.com/upload/213718/iw9kWlR5B9zI8SZWTlHW9kqQpNWEWRjwyLTj.pdf

LONG-TERM EFFECTS OF VEGETATION COVER ON THE REHABILITATION OF LEAD/ZINC MINE TAILINGS [Cleanup News]

Tue, 14 Jul 2026 18:26:13 GMT

Olea, F.E.S., I.T. Burke, R. Courtney, W.M. Mayes, A.J. Weightman, G. Webster, F. Bydalek, and D.I. Stewart. | Science of The Total Environment 1013:181257(2026)

Pb/Zn sulfide ore is extracted from carbonate host rock by milling to grain sizes <120 μm and separation by flotation at the Tara Boliden lead/zinc mine. This process produces large volumes of near-neutral pH tailings that must be carefully managed due to regulatory concern about the residual Pb and Zn concentrations (up to ∼0.3 % by wt. of each) and trace concentrations of other potentially toxic elements. To prevent dust formation, vegetation cover was established on inactive areas of the tailings management facility. This paper reports the changes in the chemical and microbiological composition of the tailings as a function of both time and depth. Over eight years, there was progressive oxidation of pyrite in the tailings, and accumulation of soil organic matter in the surface layers. The mobility of most potentially toxic elements was reduced due to sorption to ferric oxyhydroxides formed as a result of pyrite oxidation, although Cu was more mobile in surface layers probably due to formation of dissolved organic carbon complexes. The microbial community diversity in the surface layer increased with the age of the tailings and was similar to natural calcareous soil after eight years. At this age, the functional profile (functional diversity) of the community was similar to that of natural calcareous soil, despite differences remaining in taxonomic composition. Development of soil-like properties in the surface layer, such as increased soil organic matter content and a soil-like microbial community, suggests that the vegetation cover will be self-sustaining. Https://www.sciencedirect.com/science/article/pii/S0048969725028992/pdfft?md5=31618d0c6e5ffa7db7f7a3689d045cbd&pid=1-s2.0-S0048969725028992-main.pdf

BMP CONVERSION FOR AMD REFURBISHMENT [Cleanup News]

Tue, 14 Jul 2026 18:25:57 GMT

Denicola, T.A. 27th Annual PA AMR Conference, 14-16 October, State College, PA, 41 minutes, 2025

An acid mine drainage (AMD) treatment project was constructed in the mid-1990s to remediate hundreds of gals/min of mine water utilizing anoxic limestone drains and compost-limestone beds. The treatment footprint was ~3.5 acres. After over 20 years of operation, the system required refurbishment, and the landowner desired the land to be returned to a usable condition. An oxic treatment system with a smaller footprint was proposed to achieve the desired treatment effect. Calculations were performed to assess heterogeneous iron oxidization rates under fluctuating temperature, pH, and dissolved oxygen conditions and estimate the volume of precipitated sludge. The detailed calculations allowed an appropriately sized series of alkalinity-generating and oxidation-inducing treatment practices in series while managing precipitated solids along the treatment path and provided the client with an estimate of treatment performance under varying climatic and site conditions. The project is currently achieving similar contaminant reductions in a ~0.5-acre footprint. Https://www.youtube.com/watch?v=gzhuMTrz4lc

DRAFT RFP - HANFORD 222-S LABORATORY [Market/Commercialization]

Tue, 14 Jul 2026 18:25:43 GMT

Department of Energy, Environmental Management Consolidated Business Center, Cincinnati, OH
Contract Opportunities on SAM.gov 89303326REM000152, 2026

The Department of Energy (DOE) is releasing the Draft Request for Proposal (RFP) for a competitive procurement for the management and services of the 222-S Laboratory Complex at the Hanford Site for the industry to review. This RFI seeks input from interested parties regarding their capabilities to meet the requirements for the planned competitive procurement for "Hanford 222-S Laboratory Contract." In particular, DOE is seeking feedback from interested parties to questions posed in the cover letter posted with the Draft RFP. DOE will determine if the full requirements can be performed by a small business, including 8(a), HUBZone, small disadvantaged, woman-owned, or service-disabled-veteran-owned small businesses under NAICS Code 562910. Small businesses capable of performing all or a part of the Major Elements of Scope are encouraged to submit a capability statement. DOE intends to conduct a pre-solicitation conference, site tour, and one-on-one information exchange sessions with interested parties in support of the upcoming procurement. DOE has scheduled these activities to be held July 14-16, 2026. DOE is not requesting proposals at this time, and interested parties shall not submit proposals in response to the draft RFP. DOE hereby invites all interested parties to thoroughly examine the Draft RFP and the accompanying procurement website (https://www.emcbc.doe.gov/SEB/Hanford222S) in their entirety and to submit questions or comments in writing by July 31, 2026.

REGION 2 ERRS RECOMPETE (COMBINE) [Market/Commercialization]

Tue, 14 Jul 2026 18:25:13 GMT

U.S. Environmental Protection Agency, Region 3 Contracting Office, Philadelphia, PA Contract Opportunities on SAM.gov 68HE0326R0009, 2026

This is a total small business set-aside under NAICS code 562910. EPA seeks a contractor to support its ERRS contract. The purpose of the ERRS contract is to provide fast, responsive environmental cleanup services to the release, or threatened release, of hazardous substances/waste/pollutants and contaminants/materials and petroleum products/oil for the EPA Region 2, which has a geographic area comprised of New Jersey, New York, Puerto Rico, the US Virgin Islands, and eight Indian Nations. Environmental cleanup in response to natural and manmade disasters, terrorist activities, weapons of mass destruction, and chemical, biological, radiological, and nuclear incidents may also be required under this contract. A regional cross-over may be requested under this contract; under rare circumstances, international responses may be required. The award will be an IDIQ contract with a period of performance from January 27, 2027, through January 26, 2035. Offers are due by 10:00 AM EDT on August 20, 2026. https://sam.gov/workspace/contract/opp/26dd719fc2dc439ba8850eff4863f41f/view

TOWARDS SUSTAINABLE NAPLS REMEDIATION: REVIEW OF SURFACTANT-ENHANCED INTEGRATED TECHNOLOGIES IN COMPLEX GEOLOGIC MEDIA [General News]

Thu, 18 Jun 2026 19:23:58 GMT

Asif, U., R. Hussain, and M. Wang.
International Journal of Environmental Research 20:99(2026)

Surfactant-enhanced remediation (SER) effectively removes NAPLs from contaminated subsurface environments, where conventional techniques face significant challenges. In this review, several SER-integrated technologies were studied based on sustainability criteria, including time, cost, efficiency, and environmental factors such as secondary pollution and effects on the microbial community. Evidence was synthesized from lab experiments, numerical simulations, and field case studies across saturated porous, fractured, and fractured porous media. Comparative analysis indicates that surfactant-enhanced air sparging has high removal efficiency for LNAPLs in fractured porous media. Enhanced multiphase extraction recovers DNAPLs from deep fractures without adverse environmental impacts. Surfactant-enhanced electrokinetic remediation demonstrates high degradation rates and scalability, particularly in low-permeability zones. In porous media, bioremediation with the addition of biosurfactants performs favorably due to its low cost and minimal secondary pollution generation. The comprehensive study recommends focusing on hybrid technology development, utilizing machine learning models, and pilot-scale trials to better assess the economic and regulatory feasibility of SER-integrated strategies for complex saturated environments.

CASE STUDIES IN SURFACE RUNOFF AND FATE-AND-TRANSPORT MODELING AT AFFF-IMPACTED SITES [General News]

Thu, 18 Jun 2026 19:23:23 GMT

Beauvais, C.A. | PFAS Forum VI, 13-15 May, Orlando, FL, 25 minutes, 2026

This presentation describes how surface runoff modeling can be used to evaluate PFAS fate and transport and guide targeted soil and groundwater sampling during field investigations. Case examples are presented from sites where integrated modeling approaches combining surface runoff with fate-and-transport analyses were used to refine conceptual site models and improve understanding of PFAS migration pathways. Time 26:00-52:00 https://www.youtube.com/watch?v=oHZ69JeT-SE

ADVANCES IN REMEDIATION: LIGHTNING IN A BOTTLE—ELECTROCHEMICAL OXIDATION AND PLASMA FOR PFAS DESTRUCTION [General News]

Thu, 18 Jun 2026 19:23:03 GMT

Divine, C. B. Miatke, and S. Kalra. | Groundwater Monitoring & Remediation 46(2):9-18(2026)

This article explores the background and recent advancements in electrochemical oxidation (EO) and non-thermal plasma (NTP) treatments, specifically for PFAS mineralization, emphasizing their mechanisms, efficiencies, and practical challenges. Understanding these technologies is crucial for developing sustainable solutions to mitigate PFAS contamination in water. EO and NTP-based water treatment processes have emerged as promising approaches for the mineralization of PFAS, with a recent technology readiness level of 7-9 indicating that they are in their final stage of technology maturity. EO leverages anodic reactions to generate highly reactive species capable of breaking the strong carbon-fluorine bonds characteristic of PFAS molecules. Similarly, plasma technologies produce energetic electrons and reactive radicals that facilitate the decomposition of PFAS into benign end products. Both methods offer advantages such as onsite application, minimal chemical additives, and potential for complete mineralization. With recent advancements, EO and non-thermal plasma appear to have advanced considerably in scaling up systems for treating PFAS samples.

TOWARD CLOSED-LOOP REMEDIATION: A DYNAMIC OPTIMIZATION APPROACH FOR HYDRAULIC CONDUCTIVITY ESTIMATION AND PUMP-AND-TREAT DESIGN [General News]

Thu, 18 Jun 2026 19:22:42 GMT

Wei, J., S. Jiang, Q. Liu, X. Zhang, N. Zheng, and J. Xing.
Journal of Contaminant Hydrology 277:104852(2026)

A dynamic iterative optimization framework is proposed that integrates parameter inversion with remediation plan design into a closed-loop system of simulation-observation-update-optimization. The framework iteratively updates the hydraulic conductivity field (K-field) using pilot point parameterization and simulation-optimization techniques while dynamically adjusting the remediation strategy based on real-time monitoring data. Numerical experiments conducted on a virtual contaminated site demonstrated that the proposed framework significantly improves the accuracy of K-field characterization, as evidenced by decreasing logarithmic root mean square error and increasing spatial correlation coefficient over iterations. When compared with a conventional static remediation plan that is designed once and executed without updates, the dynamic framework achieves a substantially higher contaminant removal rate while simultaneously reducing the total pumping volume. Results highlight the framework's potential to enhance remediation effectiveness and reduce operational costs in heterogeneous aquifers, offering a practical and adaptive solution for complex contaminated site management. https://www.sciencedirect.com/science/article/pii/S0169772226000136/pdfft?md5=af2df904ca00dee1720cdc27d0fcfc5e&pid=1-s2.0-S0169772226000136-main.pdf

EVALUATING THE RELATIVE IMPORTANCE OF POLYFLUOROALKYL SUBSTANCES IN AFFF-IMPACTED SOILS [Research]

Thu, 18 Jun 2026 19:22:10 GMT

Jones, S.L., N. Gonda, J.C. Pritchard, J. Richardson, M.C. Bigler, M.L. Brusseau, B. Guo, J. Hatton, M. Hire, C.E. Schaefer, and C.P. Higgins.
Environmental Science & Technology 60(18):13610-13621(2026)

A multisite study analyzed depth-discrete soil samples in 12 cores (≤2 m from the ground surface) from 10 AFFF-impacted DoD installations. A broad suite of PFAS was analyzed using extraction protocols designed for source-zone soil and liquid chromatography-high-resolution mass spectrometry (LC-HRMS) with targeted and semi-quantitative workflows. Across all samples, 162 PFAS spanning 50 classes were identified, with both electrochemical fluorination (ECF)- and fluorotelomer (FT)-derived signatures present at nearly all sites. Class-level detection frequency analysis showed that shallow intervals (down to 30 cm bgs) captured most class diversity at the sites. Precursors frequently dominated total PFAS mass within a soil core, though several cores were PFAA-dominated. These data indicate that reliance on the EPA Method 1633 target list alone substantially underestimated precursor mass in all 12 studied cores. Vertical profiles of PFAAs and precursors showed varying trends and correlations in concentration with depth, suggesting site-specific transport and transformation phenomena. Results point toward several polyfluoroalkyl substances that may be considered for prompt investigation while also highlighting a need for detailed characterizations of diverse AFFF-impacted sites.

ANALYTE RECOVERY OF VOLATILE ORGANIC COMPOUNDS: A PASSIVE SAMPLING ANALYSIS VIA PHOTOTHERMAL DESORPTION COMPATIBLE DIFFUSIVE SAMPLERS [Research]

Thu, 18 Jun 2026 19:20:42 GMT

Shedd, J.S., E.L Floyd, J. Oh, B.M. McMahan, and C.T. Lungu.
ACS Omega 11(3):4232-4238(2026)

A preanalytical technique, known as photothermal desorption (PTD), which uses pulses of high-energy light to desorb analytes from thermally conductive materials, was developed to improve analytical sensitivity and time-to-knowledge of existing VOC exposure assessment methods. The theoretical and conceptual groundwork for PTD has been established, and advances have been made toward a first-generation, PTD-compatible diffusive sampler. However, additional characterizations of the prototype sampler's performance are needed before the method is ready for in-field deployment. The objectives of this study were to: (1) determine the percent mass recovered via PTD of samples collected for various VOC analytes (i.e., toluene, n-hexane, isopropyl alcohol, and TCE); and (2) quantify the analyte adsorption capacities of buckypaper (BP) sorbents for each VOC of interest. The percent mass recovery of toluene, n-hexane, TCE, and isopropyl alcohol were 0.60 ± 0.09, 1.2 ± 0.09, 1.1 ± 0.1, and 14.0 ± 1.0% per PTD pulse, and analyte adsorption capacities for BP sorbents were 152 ± 5 mg/g at 219 ppm toluene, 75 ± 42 mg/g at 292 ppm n-hexane, 104 ± 37 mg/g at 101 ppm TCE, and 105 ± 19 mg/g at 413 ppm isopropyl alcohol. The observed differences in desorption of analytes are likely attributed to varying types of weak intermolecular forces acting on aromatic rings, aliphatic chains, and polar moieties. While the large standard deviations in adsorption capacities may be explained by nonuniformity of nanotube alignment in respective sorbents. The early-stage prototype characterization data demonstrate the promising nature of PTD used with passive air samplers and provide a solid foundation for future development of the preanalytical technique and accompanying sampling devices. https://pmc.ncbi.nlm.nih.gov/articles/PMC12854607/pdf/ao5c09208.pdf

MODULATING SURFACE ARCHITECTURE OF SULFIDATED NANOSCALE ZEROVALENT IRON FOR SYNERGISTIC ENHANCEMENT OF DECHLORINATION REACTIVITY, ELECTRON SELECTIVITY, AND COLLOID STABILITY [Research]

Thu, 18 Jun 2026 19:20:19 GMT

Shen, M., Z. Liang, Y. Guo, F. He, C. Jiang, T. Zhang, and W. Chen.
Environmental Science & Technology 60(16):12666-12675(2026)

Sulfidated nanoscale zerovalent iron (S-nZVI) shows promise in the remediation of chlorinated solvents-impacted groundwater, yet its performance is hindered by the trade-off between electron selectivity and colloidal stability. The dilemma was resolved in this study by using cyclodextrin (CD) as a template in S-nZVI synthesis to regulate the surface architecture. The CD-modified S-nZVI (CD-S-nZVI) prepared using sodium sulfide as the sulfur precursor exhibits high electron selectivity toward the dechlorination of TCE, while maintaining high colloidal stability. Mechanistic assays with additional S-nZVI materials prepared by varying CD dosage and using an alternative sulfur precursor (sodium dithionite) show that the binding of Fe2+ to CD provides abundant sulfidation sites during S-nZVI formation, thus rendering a higher sulfur content and more uniform FeS coating. This suppresses hydrogen evolution and improves electron selectivity. The incorporation of CD also facilitates TCE accumulation onto S-nZVI, due to partitioning into the hydrophobic cavities of CD molecules. Moreover, steric stabilization endows CD-S-nZVI with a much higher colloidal stability than S-nZVI without CD. The CD-S-nZVI demonstrates adaptability to a broad range of aqueous chemistry conditions and excellent longevity. This new strategy has important implications for the design of highly deployable groundwater remediation nanomaterials.

PFAS FROM A DISCRETE-EVENT TERRESTRIAL SOURCE MIGRATES WITH GROUNDWATER TO INTERTIDAL SEEPAGES [Research]

Thu, 18 Jun 2026 19:20:01 GMT

Briggs, M.A., E.A. White, P.T. Scordato, H.G. Lind, Z.O. O'Neal, D.M. Rey, T.D. McCobb, C.T. Green, and D.R. LeBlanc. | Groundwater 64(3):323-334(2026)

PFAS mobility was assessed in groundwater to intertidal seepages from two discrete, adjacent tanker-truck rollover events that occurred in 1997 and 2000, where AFFF was applied to suppress fuel vapors. A combination of groundwater-flow and particle-track modeling, geophysical field characterization, and chemical sampling found substantial concentrations of PFAS (up to 530.5 ng/L), mainly PFOS, in groundwater discharging to a shoreline along an embayment used for swimming and recreational shellfish harvesting. The general groundwater trajectory to the embayment was predicted by numerical particle tracking. The highest concentrations of PFAS were found in discharges near the landward side of the intertidal zone. The discharges had variable salinity at the time of sampling. Even in areas of strong, preferential groundwater discharge at low tide, there was tidal "pumping" of ocean water into the aquifer sediments during higher tides. Therefore, there are likely to be continuously variable salinity conditions at similar seepage interfaces that have not been broadly considered in previous conceptual models of PFAS fate and transport. https://ngwa.onlinelibrary.wiley.com/doi/epdf/10.1111/gwat.70063

PFAS QUANTITATION WITH DIFFUSIVE GRADIENTS IN THIN-FILM PASSIVE SAMPLERS: CAPTURING TIME-WEIGHTED AVERAGE CONCENTRATIONS AROUND MAXIMUM CONTAMINANT LEVELS TO FACILITATE COMPLIANCE [Research]

Thu, 18 Jun 2026 19:15:38 GMT

Harris, B.J., S.D. Hodges, D.G. Wahman, L.M. Haupert, J.R. Chimka, and J.L. Fairey.
Water Research 300:125918(2026)

Diffusive gradients in thin-films (DGT) passive sampler gel layer diffusion coefficients (DGel) ± 95 % confidence intervals (CIs) were determined using two-compartment diffusion cell tests analyzed with a non-steady-state finite difference model (FDM) for 32 PFAS. For each PFAS, the FDM also determined the normalized weighted sum of squared errors (WSSE × n^-1). Eleven PFAS had adequate FDM fits (WSSE × n^-1 < 0.03), and DGel ± 95% CIs decreased with increasing molecular weight from 7.1 to 5.1 (± 0.1-0.6) × 10-6 cm²/s. For the other 21 PFAS, linear regression models (DGel vs. MW; R² ≥ 0.967) were used to estimate DGel ± 95% CIs from 3.4 to 7.6 (± 0.2-1.0) × 10-6 cm²/s. Compared to their free water diffusivities, DGel values differed by a median of 6.5% and first and third quartiles of 4.5 and 8.7%, respectively. Error in DGel was propagated into time-weighted average concentrations (CDGT) for 5-36-day lab-scale DGT deployments, in which CDGT ± 95% CIs for 20-31 of the 32 PFAS were indistinguishable from grab samples (sign test; α = 0.05). DGTs accurately captured time-weighted average PFAS aqueous phase concentrations at ∼1, 10, 100, and 200 ng/L. This study demonstrates the utility of DGTs to quantify PFAS at low ng/L levels and establishes methods for PFAS DGel determinations, error propagation into CDGT, and comparisons with grab sampling.

RESEARCH BRIEF 374: DUAL-ACTION BIOAUGMENTED SORBENTS OPTIMIZE GROUNDWATER CLEANUP [Research]

Thu, 18 Jun 2026 19:07:28 GMT

National Institute of Environmental Health Sciences, Superfund Research Program (SRP), June 2026

A new study may help improve cleanup strategies for groundwater and sediment contaminated with persistent chlorinated organic pollutants. Researchers used modeling tools to better understand and optimize their cleanup technology that combines pollutant-degrading bacteria with an activated carbon sorbent, called bioaugmented sorbents. To understand how sorbent surfaces influence bacterial activity, the team combined a liquid mixture of Dehalobium chlorocoercia strain DF-1 and two commercial activated carbons in airtight glass bottles. The researchers then developed BIO-FO-IAST, a mass transfer model that includes Biokinetics, First-Order Sorption Kinetics, and Ideal Adsorbed Solution Theory, to measure the complex interaction between sorption and biodegradation. Results demonstrated that bacteria attached to activated carbon maintained strong degradation activity. The model proved that bacteria and carbon work in synergy to continue degrading PCE as the sorbent released it, that the overall dechlorination per bacterial cell was higher when using the bioaugmented sorbents compared to standard water treatment systems, and that activated carbon inadvertently absorbed essential B vitamins from the water. Without enough B vitamins, DF-1 bacteria slowed or stopped degrading PCE. However, when the researchers added sufficient B vitamins, the bacteria resumed activity and rapidly broke down the trapped PCE into harmless end products. Once properly supplemented with vitamins, their combined technology was 50% more efficient at degrading PCE compared to bacteria alone. Findings have direct implications for field management. At nutrient-poor groundwater sites, adding activated carbon and bacteria may not be enough. Site managers may need to monitor nutrient conditions and add B vitamins or related amendments to keep the bacterial cleanup process active. https://tools.niehs.nih.gov/srp/researchbriefs/view.cfm?Brief_ID=374

SOIL REMEDIATION OF PFAS USING RAPID LEACHING TECHNOLOGY [Demonstrations]

Thu, 18 Jun 2026 19:07:04 GMT

Massa, B. | PFAS Forum VI, 13-15 May, Orlando, FL, 25 minutes, 2026

This session presents results of a field pilot study conducted at a military installation using the Rapid Leaching Technology (RLT) proprietary technology to remediate PFAS in soil. The technology uses a unique and patented filtration system to fully saturate the soil with water, removing the micro-NAPL layer, then rapidly dewater it in a watertight containment cell constructed from geomembrane and geosynthetic clay liners. The generated leachate is collected in a similarly constructed secondary watertight cell and then pumped through a wastewater treatment system to remove PFAS for future destruction or disposal. The treated water is then reused and the process repeated. The soil is re-saturated with the treated water within the containment cell as necessary until the desired PFAS removal limits have been obtained. Three separate benchtop studies documented average total PFAS removal ranging from 89 to 93% per rinse cycle. The technology removed 94-100% of the five PFAS analytes regulated by EPA. Additional rinse cycles can be incorporated into the technology to achieve additional PFAS removal. The benchtop studies used three and four rinse cycles to determine the effectiveness. See times 1:14:50-1:34:13 https://www.youtube.com/watch?v=WbXRFZy1ZtM

ELECTROSTATIC CONCENTRATION OF PFAS IN COMPLEX WATERS: EVALUATION OF THE AQUEOUS ELECTROSTATIC CONCENTRATOR (AEC) TECHNOLOGY [Demonstrations]

Thu, 18 Jun 2026 19:06:23 GMT

Chandler, T. | PFAS Forum VI, 13-15 May, Orlando, FL, 25 minutes, 2026

The Aqueous Electrostatic Concentrator (AEC) applies an electric field to selectively attract and immobilize charged PFAS molecules onto engineered membranes, followed by a thermal electro-oxidative destruction step. Studies evaluated AEC performance across bench- and pilot-scale trials, with an emphasis on treatment kinetics, operational parameters, and the regulatory implications. Surface water, groundwater, and landfill leachate with varying ionic strength and organic load were tested. Pretreatment included electrocoagulation and advanced oxidation applied to landfill leachate to reduce COD and hardness (>95%), mitigating fouling and scaling. The AEC operated as a low hydraulic pressure system with closed-loop electrolyte circulation and no sacrificial anode. Independent lab analyses quantified PFAS removal efficiencies across multiple compound classes (PFOA, PFOS, PFHxS, 5:3-FTCA). Operational parameters including power demand, concentrate volume, and membrane life were monitored at pilot-scale to inform full-scale design. Bench- and pilot-scale evaluations confirm that the AEC achieves high PFAS removal efficiencies (94-99.99%) across diverse matrices, including extreme landfill leachate conditions. Initial PFAS concentrations exceeding 7,500,000 ppt were reduced to below EPA limits following AEC treatment. When pretreating landfill leachate, COD and hardness reductions (>95%) improved AEC performance in high-strength leachate. Operational advantages included low energy consumption, minimal secondary waste generation, and reduced replacement part demand. Findings support AEC as a sustainable, scalable solution for PFAS removal and destruction, enabling compliance with stringent EPA standards while reducing lifecycle costs and environmental impacts. See times 38:30-1:00 https://www.youtube.com/watch?v=iNwYFCiNka4

PERFORMANCE OF CERAMIC PASSIVE SAMPLERS FOR THE MONITORING OF PFAS IN SURFACE WATER AND GROUNDWATERS [Demonstrations]

Thu, 18 Jun 2026 18:52:40 GMT

Moro, G., S. Santana-Viera, S. Perez, and S. Lacorte.
Analytical and Bioanalytical Chemistry(2026)

Ceramic passive sampler (CPS) devices combined with liquid-chromatography/tandem mass spectrometry were used to determine PFAS in groundwater and river water within the Besos River catchment area in Barcelona, Spain. CPS were first calibrated for seven target PFAS under controlled lab conditions. All compounds exhibited linear uptake behavior over a 20-day calibration period and helped determine compound-specific sampling rates. Lab blank experiments were also performed to evaluate background contamination and ensure reliable quantitative interpretation of field data. The calibrated CPSs were subsequently deployed in both groundwater and river water for 14 days. Total PFAS concentrations ranged from 19.7 to 250 ng/L, revealing widespread contamination across the study area. The concentrations obtained were consistent with those reported previously for the Besos system and for other impacted European aquatic environments using conventional grab sampling methods. Results demonstrate the strong potential of CPS as an innovative and robust tool for quantitative PFAS monitoring in surface water and groundwater, providing reliable time-integrated concentration data and supporting their application in long-term environmental surveillance programs. Download article at https://link.springer.com/content/pdf/10.1007/s00216-026-06533-y.pdf

POST-REMEDIAL DESIGN REMEDY OPTIMIZATION TO REDUCE LIFE CYCLE COSTS AND REMEDIATION TIMEFRAMES AT A SUPERFUND SITE [Cleanup News]

Thu, 18 Jun 2026 18:52:20 GMT

Perlmutter, M. | DCHWS East, 4-6 March, Philadelphia, PA, 25 slides, 2026

This presentation describes a multi-phase optimization process conducted at the Walker Machine Products Superfund site in Tennessee, where CVOCs impacted soil, groundwater, and soil vapor within loess and underlying fluvial sand deposits. The original remedial design included soil excavation, SVE, hot air injection, passive air entry, and air sparging systems to address contaminant mass and achieve remedial action objectives. Following remedial design completion, a series of data-driven optimization evaluations were performed to improve remedy effectiveness and reduce long-term costs. Initial recommendations included replacing hot air injection with electrical resistance heating and incorporating horizontal directional drilling for air sparging wells to increase treatment certainty and reduce remediation duration. Subsequent investigations refined the treatment area through targeted soil sampling, equipment optimization, and conceptual site model updates. New data demonstrated that contaminant mass was primarily associated with the fluvial sands rather than the overlying loess, allowing the remedy to be further simplified by eliminating large portions of the planned thermal treatment infrastructure. The final optimized remedy focused SVE and air sparging operations on the zones containing the highest contaminant mass, reducing capital expenditures, lowering life-cycle costs, decreasing energy consumption, and shortening the anticipated remediation timeframe while maintaining compliance with remedial action objectives. Startup performance testing further optimized system operation and confirmed effective contaminant recovery. This case study demonstrates how iterative optimization, supplemental characterization, and continual refinement of the conceptual site model can improve remedial outcomes, avoid unnecessary treatment technologies, and deliver substantial cost and schedule benefits at complex Superfund sites. https://mediacdn.guidebook.com/upload/213717/j8Evu8rY8Y1SNzU2MfdYIIWZTPwmNHSMjzsi.pdf

OPTIMIZING AN IN SITU THERMAL REMEDY VIA PRE-REMEDIAL INVESTIGATION AT A FORMERLY USED DEFENSE SITE IN RHODE ISLAND [Cleanup News]

Thu, 18 Jun 2026 18:51:59 GMT

Grant, S. | DCHWS East, 4-6 March, Philadelphia, PA, 15 slides, 2026

Successful implementation of in situ thermal remediation (ISTR) at complex fractured-bedrock sites requires a thorough understanding of contaminant distribution, hydrogeologic conditions, and preferential transport pathways. At the PR-58 Nike Missile Battery and Disaster Village Training Area in North Kingstown, Rhode Island, a comprehensive pre-remedial investigation (PRI) and supplemental PRI (SPRI) were conducted to optimize the design of a proposed thermal remedy for CVOCs. The investigation employed an Adaptive Management Decision Model that integrated real-time field data collection and interpretation to guide characterization activities. Multiple lines of evidence, including Color-Tec® screening, groundwater and soil sampling, packer testing, geophysical logging, and three-dimensional conceptual site modeling, were used to delineate contaminant extent and identify critical fracture networks controlling groundwater flow and contaminant migration. Geophysical logging revealed interconnected fracture sets that represent preferential pathways for contaminant transport, providing key insights into the site's hydrogeologic framework. Results from the SPRI refined the conceptual site model and fully delineated the horizontal and vertical extent of CVOC impacts, identifying groundwater concentrations up to 70 ppm and soil concentrations up to 10 ppm. These findings enabled optimization of the ISTR design by improving treatment area definition, establishing realistic treatment goals, reducing uncertainty, and supporting more accurate cost estimates. The project demonstrates the value of adaptive investigation strategies, collaborative decision-making, and targeted data collection in reducing remedial design uncertainty and improving the effectiveness of thermal remediation systems at fractured-bedrock sites. https://mediacdn.guidebook.com/upload/213717/5AtlroclMuJ0e5Kp4ruL7vd8XxKNmeSTrMDt.pdf

NORTHROP GRUMMAN BETHPAGE FACILITY AND NAVAL WEAPONS INDUSTRIAL RESERVE PLANT SITES: GROUNDWATER PLUME CLEANUP UPDATE [Cleanup News]

Thu, 18 Jun 2026 18:41:34 GMT

NY State Department of Environmental Conservation, 4 pp, 2026

Historic operations at the Northrop Grumman Bethpage Facility and Naval Weapons Industrial Reserve Plant Sites created a TCE groundwater plume, extending ~4 miles south, 2 miles wide, and between 200 and 900 ft bgs. While 20 extraction wells that withdraw ~10 million gals of contaminated water daily from the plume currently operate, additional cleanup efforts are underway to meet the objectives of DEC's comprehensive plan. Phase 1 of the groundwater extraction and treatment system was enhanced by adding two extraction wells. During Phase 2, the Navy installed six extraction wells and ~18,000 ft of underground piping and constructed a state-of-the-art water treatment plant to expedite cleanup of the plume interior. To hydraulically contain the groundwater plume and prevent contamination from migrating, the Navy has continued with the design and construction of extraction wells and a water treatment plant along the leading edge of the plume. To date, the Navy has installed three extraction wells and >6,000 ft of underground conveyance piping; with installation of an additional 2,600 ft of piping for the RW-10 extraction well planned. Construction of the treatment plant is scheduled to start in 2027 and is expected to begin operating in late 2028. To intercept the plume while this construction is underway, interim systems began operating in June 2025 and early 2026. In 2023, Northrop Grumman began operation of a groundwater extraction and treatment system that treats ~2 million gals of water/day from three extraction wells within the interior of the plume that historically originated from historic disposal that occurred at the Former Grumman Settling Ponds. To date, more than 1.6 billion gals of groundwater have been extracted and treated, and ~19,000 lbs of contamination have been removed. Northrop Grumman is completing a predesign investigation to support the possible siting of additional extraction wells to contain the southeastern portion of the plume. This work has included drilling deep soil borings and collecting groundwater samples to determine if the plume has migrated into this area. Initial results indicate the deep plume has not migrated as far as previously anticipated. https://dec.ny.gov/sites/default/files/2026-01/grummanupdate0126.pdf

All site documents: https://administrative-records.navfac.navy.mil/?NL6VNT7O6G4XM3TM

LIMITED COMPETITION: SUPERFUND HAZARDOUS SUBSTANCE RESEARCH AND TRAINING PROGRAM (P42 CLINICAL TRIAL OPTIONAL) [Market/Commercialization]

Thu, 18 Jun 2026 18:41:18 GMT

National Institutes of Health, Funding Opportunity RFA-ES-27-004, 2026

The National Institute of Environmental Health Sciences (NIEHS) is announcing the continuation of the Superfund Hazardous Substance Research and Training Program, referred to as Superfund Research Program (SRP) Centers. SRP Center grants will support problem-based, solution-oriented research Centers that consist of multiple, integrated projects representing both the biomedical and environmental science and engineering disciplines; as well as cores tasked with administrative (which includes Center leadership, data management, and training); translational research and engagement; and research support functions. The scope of the SRP Centers is taken directly from the Superfund Amendments and Reauthorization Act of 1986, which limits competition for this program to accredited institutes of higher education. Eligibility for additional information. In accordance with NIH standard peer-review processes, the application(s) will be peer-reviewed, and only meritorious application(s) will be considered for funding. To support innovative research and training through multi-project, interdisciplinary grants. Areas of research may include: (1) advanced techniques for the detection, assessment, and evaluation of the effects of hazardous substances on human health; (2) methods to assess the risks to human health presented by hazardous substances; (3) methods and technologies to detect hazardous substances in the environment; and (4) basic biological, chemical, and physical methods to reduce the amount and toxicity of hazardous substances. Applications are due by 5:00 pm local time of applicant organization on September 25, 2026. https://simpler.grants.gov/opportunity/daffbf0f-45f1-423b-8b6d-e994db43ce08

F -- INDEFINITE-DELIVERY/INDEFINITE-QUANTITY (ID/IQ) SMALL BUSINESS ENVIRONMENTAL REMEDIAL ACTION CONTRACT FOR SITES IN HAWAII, GUAM, AND OTHER AREAS WITHIN THE NAVAL FACILITIES ENGINEERING SYSTEMS COMMAND PACIFIC AREA OF RESPONSIBILITY VI (SBRAC VI) (PRESOL) [Market/Commercialization]

Thu, 18 Jun 2026 18:39:37 GMT

U.S. Department of the Navy, NAVFAC Pacific Command, Joint Base Pearl Harbor Hickam, HI
Contract Opportunities on SAM.gov N62742-26-R-1801, 2-026

When this solicitation is released on or about June 23, 2026, it will be competed as a total small business set-aside under NAICS code 562910. The Department of the Navy has a requirement for environmental remediation services at environmentally contaminated sites, primarily located at Navy and Marine Corps installations and other Government facilities within the Naval Facilities Engineering Systems Command (NAVFAC) Pacific area of responsibility, with work potentially performed at other locations as required by the Government. The contractor shall provide a broad range of environmental restoration and remedial activities, including removal and remedial actions, emergency response, munitions response and range cleanup, site characterization, groundwater and sediment remediation, storage tank closures and replacements, hazardous material response, operation and maintenance of remediation systems, and related technical support. Work may involve contaminants including petroleum products, metals, PCBs, PAHs, PFAS, munitions and explosives of concern, pesticides, and other hazardous materials in soil, groundwater, sediment, surface water, air, and structures. The Government anticipates awarding a single Cost-Plus-Fixed-Fee, Indefinite-Delivery/Indefinite-Quantity contract with a one-year base period and four one-year option periods, a minimum guarantee of $5,000, and a maximum contract value of $245,000,000. The award will be made on a best-value basis, with technical factors and past performance significantly more important than cost. There is no solicitation available at this time.
https://sam.gov/workspace/contract/opp/f333f9ec8c794b05a988c8ddefb53849/view

AK ARCTIC NWR BIG RAM LAKE SOIL & HAZARDOUS MATERIALS (SOL) [Market/Commercialization]

Fri, 5 Jun 2026 20:20:25 GMT

U.S. Department of the Interior, Fish and Wildlife Service, SAT Team 1, Falls Church, VA
Contract Opportunities on SAM.gov 140FS126Q0104, 2026

This is a total small business set-aside under NAICS code 562910. The Fish and Wildlife Service seeks a contractor to assess and characterize a potential petroleum spill at Big Ram Lake in Alaska to determine whether contaminated soil and groundwater are present and whether remediation is necessary. Environmental sampling and analysis will include petroleum hydrocarbons, volatile organic compounds, PAHs, and total lead in accordance with Appendix F of the 2024 ADEC Field Sampling Guidance for AVGAS. The contractor will prepare a site characterization and remediation plan/report for the spill and, if corrective action is required, develop a cost proposal as part of a Corrective Action Plan. In addition, asbestos, lead-based paint, and PCB-containing paint evaluations will be conducted for buildings slated for demolition, with a separate hazardous materials report documenting identified materials, estimated quantities, and associated remediation or removal cost estimates. Big Ram Lake is located in the Arctic National Wildlife Refuge in Alaska and can only be accessed by float plane. It is a remote location with limited facilities. There are several buildings (i.e., Cook Shack, Sleeping Cabin, and Outhouse) but absolutely no other amenities. The award will be a firm-fixed-price contract with a period of performance from June 22 to December 31, 2026. Offers are due by 11:59 PM CDT on June 7. https://sam.gov/workspace/contract/opp/d71a9bc31b0949059d0f7bb9b65fd96c/view

TWENTY-FIVE YEARS OF RESEARCH AND MONITORING USING PUF DISK PASSIVE AIR SAMPLERS [General News]

Fri, 5 Jun 2026 17:28:36 GMT

Eng, A., Y.-M. Hsu, T. Harner, J. Mastin, and S. Wheadon.
Environmental Science & Technology 60(16):11833-11870(2026)

Polyurethane foam (PUF) disk-based passive air samplers (PASs) have become a pivotal tool in research and monitoring of persistent organic pollutants and emerging chemicals in ambient air in the gas phase and on ambient particulate matter. Their low cost and ease of use have facilitated deployment at the regional and global scales. Modifications to the polyurethane foam (PUF)-PAS have expanded its use for more specific purposes, such as the sorbent-impregnated PUF-PAS (SIP-PAS), which improves sorptive capacity for more volatile chemicals, and the passive dry deposition (PAS-DD) sampler, which captures larger particles and enables estimation of gas and particle deposition. The review summarizes studies characterizing uptake rates and partition coefficients of PUF disks for a wide range of compounds and evaluations of sampler design and performance. It synthesizes applications of PUF-PAS, SIP-PAS, and PASDD from 2000 through 2024 across ambient air measurements, indoor air quality, source emissions, health, and, most recently, biodiversity. Approximately 650 publications employing PUF disk-based PASs are summarized, demonstrating their increasing use and diversification. On the horizon, the PUF-PAS will likely continue to transform and integrate fields of science and inform policy. https://pubs.acs.org/doi/pdf/10.1021/acs.est.5c17602?ref=article_openPDF

RECENT ULTRATRACE PER- AND POLYFLUOROALKYL SUBSTANCE (PFAS) DETECTORS [General News]

Fri, 5 Jun 2026 13:35:02 GMT

Park, J. and S. Park. Nanoscale 11(2026)

This review discusses advances in PFAS detection made over the last five years in organic molecules and assemblies, polymers, nanoparticles, carbon nanotubes, and metal-organic frameworks, highlighting how tailored recognition motifs and controlled assembly convert PFAS binding into optical, electrochemical, or resistive signals. Representative strategies discussed include interrupted energy transfer and amplifying fluorescent polymers for ratiometric and turn-off fluorescence sensing; molecularly imprinted and nanostructured electrodes for impedimetric and voltammetric quantification; single-particle collision electrochemistry and MXene-metal hybrids for ultralow electrochemical detection; printed surface-enhanced Raman spectroscopy substrates for molecular fingerprinting; and 2D conductive MOFs for chemiresistive ppt-level responses. Analytical performance, selectivity trends across chain length and headgroup chemistry, matrix effects in real waters, and practical considerations for onsite deployment are evaluated. The review concludes by identifying key challenges (stability, standardization, and multiplexed detection) and outlines promising directions toward translating ultratrace PFAS sensors into robust environmental monitoring tools.

PHYTOREMEDIATION OF LOW-CONCENTRATION CR(VI)-CONTAMINATED SOIL FROM A SUPERFUND SITE USING SUNFLOWER (HELIANTHUS ANNUUS L.) WITH CONCURRENT BIODIESEL PRODUCTION FROM HARVESTED SEEDS [Research]

Fri, 5 Jun 2026 13:34:47 GMT

Hadiuzzaman, M., S.T. Sabuj, and J. Liu. | Bioresource Technology Reports 32:102308(2025)

A study evaluated the feasibility of using sunflower (Helianthus annuus L.) for simultaneous phytoremediation of low-level Cr(VI)-contaminated soil and biodiesel production. Soil was collected from a remediated Superfund site with low residual Cr(VI) concentrations (0.16 ± 0.04 mg/kg), and controlled pot experiments were conducted under two amendment conditions (low-nitrogen chemical fertilizer and biosolids) to assess plant growth, Cr(VI) uptake, biodiesel quality, and microbial responses. In addition, bioaccumulation factors and translocation factors were assessed to evaluate the efficiency of chromium uptake and movement within the plant. Cr(VI) was absorbed by the roots and translocated to shoots, leaves, and seeds, with both amendments achieving comparable phytoextraction efficiencies. Biosolids amendment significantly enhanced plant biomass compared to chemical fertilizer, while no visible phytotoxicity symptoms were observed, indicating that sunflower tolerated the low-level Cr(VI) contamination. Biodiesel extracted from the seeds met ASTM standards for acid value and density, confirming its potential as a renewable fuel. Microbial biomass carbon and nitrogen in the rhizosphere increased after phytoremediation, suggesting a beneficial role of soil microbes in supporting plant growth and remediation. The study demonstrates that integrating sunflower-based phytoremediation of low-level Cr(VI) with biodiesel production provides a sustainable and cost-effective strategy for addressing residual contamination while contributing to renewable energy generation.

LEAD TRANSFORMATION TO PLUMBOJAROSITE REMAINS STABLE FOLLOWING LIME ADDITION FOR LEAD AND ARSENIC CONTAMINATED SOILS [Research]

Fri, 5 Jun 2026 13:34:26 GMT

Blackmon, M.D., T.D. Sowers, A.R. Betts, C. Jiang, and K.D. Bradham.
Journal of Hazardous Materials 506:141540(202

Stability experiments were performed at simulated field conditions for six weeks to assess jarosite-based remediation efficacy at environmentally nominal pH conditions. Smelter-impacted and legacy pesticide (lead arsenate) contaminated soils (SM and LP, respectively) were evaluated. Soils were adjusted to a range of pH conditions using either CaCO₃ or Ca(OH)₂ to facilitate growth of centipede and perennial ryegrass. Grass growth occurred in limed samples from pH 4.3-8.6 with XAS-confirmed PLJ stability over six weeks. Lead in vitro bioaccessibility (IVBA)% results for all treated soils were consistent with PLJ formation, showing averaged reductions of 77.3-8.0% and 81.6-11.0% post treatment in LP and SM soils, respectively, with a reduction in As IVBA% across all soils.

DNAPL-RESPONSIVE HYDROGEL NANOREACTOR ENCAPSULATING NZVI FOR ENHANCED DEGRADATION OF CHLORINATED CONTAMINANTS IN GROUNDWATER [Research]

Fri, 5 Jun 2026 13:34:12 GMT

Sang, K., Z. Li, X. Tao, C. Chen, M. Chen, H. Gao, J. Xu, J. Hou, K. Yang, and D. Lin.
Environmental Science & Technology 60(11):8734-8748(2026)

Nanoscale zerovalent iron (nZVI) reactors (nZVI@PNIPAM) via in situ reduction of incorporated Fe³⁺ ions were fabricated by engineering DNAPL-responsive poly(N-isopropylacrylamide) (PNIPAM) hydrogels with precisely controlled hydrophobic domains. Hydrogel encapsulation enabled nZVI to remain well-dispersed, spontaneously penetrated porous media, and significantly suppressed side reactions with water. The nanoreactors leveraged the selective interaction between DNAPLs and PNIPAM's hydrophobic functional groups as a trigger, exposing encapsulated reactive nZVI exclusively at contamination interfaces through a rapid conformational transition and dehydration of PNIPAM. This interfacial interaction yields unprecedented efficiency, achieving 4.4-12.3-fold higher electron utilization for degradation of seven typical chlorinated solvents than conventional nZVI, while suppressing water corrosion over 600-fold. Field-relevant evaluations demonstrated consistent performance across broad hydrochemical conditions (pH 6-9, 0-1,000 mg/L KCl, 0-200 mg/L natural organic matter), with >90% DNAPL removal in real contaminated groundwater. The mechanistic discovery of pollutant-responsive activation represents a significant advance over current diffusion-limited approaches, potentially revolutionizing targeted in situ groundwater remediation strategies.

CHARACTERIZATION OF THE POTENTIAL LONG-TERM IMPACT FROM SEDIMENTARY PFAS AT A HISTORICALLY CONTAMINATED TEXTILE WASTE SITE [Research]

Fri, 5 Jun 2026 13:33:57 GMT

Snook, J., J. Becanova, S. Vojta, and R. Lohmann. | ACS ES&T Water 6:521-528(2026)

Two sites in Rhode Island have textile-mill-associated waste retention ponds known to introduce PFAS contamination to the adjacent river, estuary, and eventually the Atlantic Ocean. The retention ponds were investigated as a long-term source of PFAS via water passive sampling, sediment coring, and laboratory-derived partitioning coefficients, Kd, with field sediment and water. Additional studies were performed to assess mobility and estimate the mass fluxes of PFAS from sediment to water. Retention pond 1 was more contaminated (up to 26 ng/L PFOA in water and 74 ng/g PFTrDA in sediment). Derived log Kd values ranged from 1 to 5 for most PFAS, indicating a shift from relative mobility to high storage potential in sediment. Estimated loss fluxes from the sediment varied between 5 and 228 μg/m2/year, resulting in desorption times from three years for FPeSA to >100 years for FOSA. The combined evidence suggests that if left untreated, the textile mill retention pond constitutes a source of long-term contamination to the river. https://pmc.ncbi.nlm.nih.gov/articles/PMC12797218/pdf/ew5c01210.pdf

IN SITU XANES STUDY OF PFAS IMPACTED SOILS FILLED WITH AQUEOUS AND NON-AQUEOUS PHASES [Research]

Fri, 5 Jun 2026 13:33:44 GMT

Kumar, A., M.K. Alam, B. Qian, M.J. Donn, D.A. Navarro, J.L. Rayner, G.B. Davis, B. Cowie, B. Pejcic, and S. Fisher. Journal of Contaminant Hydrology 277:104820(2026)

The partitioning of PFAS in a spiked agricultural soil and an AFFF-impacted "aged" soil was investigated under various soil moisture conditions and when the soil pores were filled with NAPL. Sulfur (S) K-edge X-ray absorption near edge structure (XANES) spectroscopy was used to probe S speciation in situ, and spectra were analyzed using a Gaussian Curve Fitting approach. Six major S species were identified in both soil and PFAS partitioning behavior was interpreted based on changes in sulfonate fractions, representing sulfonic acid-based PFAS. In the spiked soil, sulfonate fractions increased the most when soil pores had a water saturation ratio of 0.25, whereas in the "aged" soil the most significant increase occurred for completely saturated soil pores. These differences were attributed to differing micellar formation behaviors in freshly spiked versus AFFF-impacted "aged" soil. A linear correlation was also observed between the ratio of total reduced S and sulfonate fractions against the degree of saturation of "aged" soil. In spiked soil, a lower percentage of NAPL content at SW = 0.25 led to higher partitioning of sulfonic acid-based PFAS. https://www.sciencedirect.com/science/article/pii/S0169772225003250/pdfft?md5=ff03cc5a6b6d04116587d83e8f52bdd1&pid=1-s2.0-S0169772225003250-main.pdf

COMPLEMENTARITY OF PASSIVE SAMPLING AND COMPOSITE AQUEOUS SAMPLING TO ASSESS PFAS EMISSIONS IN INDUSTRIAL WASTEWATER [Research]

Fri, 5 Jun 2026 13:31:26 GMT

Hensel, T., J.-H. Hein, P. Krystek, A. Togola, T. Reemtsma, and F. Zietzschmann.
ACS EST Water 6(3):2008-2017(2026)

This study evaluates the capability of a polar organic chemical integrative sampler, a Speedisk sampler, and flow-through tube passive samplers (PS) to enhance PFAS monitoring in industrial wastewater. Effluent from a textile manufacturer, an industrial laundry, and a semiconductor facility (all ≥10,000 m³a discharge) was sampled over two work weeks. Passive sampling using the three samplers was conducted, while an automated aqueous sampler obtained continuous composite wastewater samples. Composite samples revealed fluctuating concentrations of up to 18 different PFAS (varying by site) with total loads from 0.12 mg/day (semiconductor manufacturer) to 8.8 mg/day (industrial laundry). The PS detected up to 19 additional PFAS compared to aqueous samples, revealing multiple representatives of legacy PFAS as well as precursor compounds (6:2 FTAB, 6:2 FTS), differing by site. Quantitative assessments from PS in the complex industrial matrices remained inconclusive and need further examination. This study highlights the in situ enrichment potential of PS as sensitive and low-maintenance qualitative tools.

TIME DOMAIN INDUCED POLARIZATION MONITORING FOR ENHANCED REMEDIATION OF DNAPLS DURING IN-SITU MICROEMULSION FLUSHING [Demonstrations]

Fri, 5 Jun 2026 13:31:11 GMT

Zhao, R., X. Guan, A. Gu, J. Meng, X. Huang, S. Liu, and D. Mao.
Environmental Earth Sciences 85:165(2026)

Alternating time domain induced polarization (TDIP) measurements and injection/pumping operations were conducted at a CHCl3-contaminated weathered andesite site. Full-decay TDIP data were inverted and correlated with groundwater sampling to reflect contaminant solubilization and reagent distribution. Interpretation results demonstrated that TDIP provided spatially continuous electrical imaging in the entire remediation volume, capturing the footprints of CHCl3-contaminated groundwater and the remediation reagent. The injected reagent exhibited strong conductivity and polarization contrasts with contaminated groundwater, confirming its spread across most of the weathered andesite layer. Thresholds of m=50 mV/V delineated CHCl3 contamination zones exceeding the regulatory limit of 300 µg/L. Reagent spreading along profiles revealed preferential flow paths within highly permeable fracture zones. Chargeability reduction correlated with DNAPL desorption showed >90% removal efficiency in groundwater samples, although residual contamination persisted in heavily contaminated zones. Microemulsion flushing effectively enhanced DNAPL solubilization, while weathered andesite medium and excessively high injection velocity limited remediation effectiveness. This article is Open Access at https://link.springer.com/article/10.1007/s12665-026-12901-9.

NONTARGET GC-ECNI-ORBITRAP-HRMS SCREENING AND EVALUATION METHOD USED TO IDENTIFY POLYHALOGENATED COMPOUNDS EXTRACTED FROM TWO PASSIVE AIR SAMPLERS DEPLOYED AT MARINE ISLANDS IN AUSTRALIA [Demonstrations]

Fri, 5 Jun 2026 13:30:50 GMT

Schweizer, S., G. Korkmaz, J. Hauns, A.R Schachtele, X. Wang, C. Paxman, J. Mueller, and W. Vetter. | Science of the Total Environment 1020:181579(2026)

Gas chromatography with electron capture negative ion high-resolution mass spectrometry (GC-ECNI-OrbitrapHRMS) was applied for the comprehensive analysis of halogenated natural products (HNPs) and anthropogenic organohalogen compounds in two passive air samples from Australian marine islands. This enabled the detection of ~250 halogenated compounds in the two air samples, of which reference standards were available for only ten. For the evaluation, the compounds were listed according to the exact mass of the nonhalogenated backbone (halogens in the molecular formula were replaced with hydrogens; primary list) calculated in the next step. Compounds with the same backbone were listed together, which was crucial for data interpretation. Specifically, the ~250 compounds could be traced back to ~100 different backbones. Four additional secondary lists were calculated to indicate structurally related homologues if their exact masses were also found in the primary list. Key findings include the detection of several sponge-derived HNPs and >20 halogenated nitrobenzenes and nitrophenols, including iodine-containing ones. The primary and secondary list-based evaluation may be a promising approach for other complex datasets with polyhalogenated compounds. https://www.sciencedirect.com/science/article/pii/S0048969726002391/pdfft?md5=4ab3daa765fb27c1aab39b088505234d&pid=1-s2.0-S0048969726002391-main.pdf

FIELD TEST OF A SCALED-UP BIOELECTROCHEMICAL SEQUENTIAL REDUCTIVE/OXIDATIVE PROCESS FOR CHLORINATED ALIPHATIC HYDROCARBONS (CAHS) REMEDIATION FROM CONTAMINATED GROUNDWATER [Demonstrations]

Fri, 5 Jun 2026 13:30:35 GMT

Dell'Armi, E., P. Ciampi, A. Marchetti, E. Bartsch, M. Alesi, E.J. Alesi, G. Rehner, B. Matturro, V. Feigl, M. Molnar, S. Rossetti, M.P. Papini, and M. Zeppilli.
Chemical Engineering Journal 524:169825(2025)

This study presents the performance of a scaled-up sequential anaerobic/aerobic bioelectrochemical system (BES) integrated with a groundwater circulation well system that was applied to a CAH-contaminated site in Northern Italy. The pilot system, consisting of four 105 L modules, operated under three different hydraulic retention times and potentiostatic conditions. Maximum tetrachloroethane removal was 1.23 mg/L/d, with a coulombic efficiency of 0.83%. The study includes aquifer geological characterization, essential for assessing the long-term behavior of the DNAPL source, and microbial analysis of the inoculum used to prime the system. Ecotoxicity tests were conducted on both influent and effluent to evaluate environmental risks. Results showed slight initial toxicity for Aliivibrio fischeri but no adverse effects on protozoa, plants, or Daphnids. This study represents the largest effort to scale up a bioelectrochemical process to remediate CAHs, and one of the largest bioelectrochemical pilot installations overall in terms of the electrode active area. Findings highlight both the potential and the challenges of scaling up BES for CAH remediation. https://www.sciencedirect.com/science/article/pii/S1385894725106682/pdfft?md5=3fb2260c148e963413ed5af001790cf7&pid=1-s2.0-S1385894725106682-main.pdf

PHYTOREMEDIATION OF AN ACID TAR PIT AT CINDERHILL, DERBYSHIRE, UK: LESSONS LEARNED AND FUTURE CHALLENGES [Demonstrations]

Fri, 5 Jun 2026 13:30:19 GMT

Johnson, M.F., H. Wood, S. Bryan, S. Craig, W. Meredith, C. Snape, and C.N. Uguna.
Journal of Environmental Management 405:129690(2026)

Monitoring results are presented from a large-scale field trial (30 m×16 m area) of willow (Salix) phytoremediation at an acid tar pit at Cinderhill, UK. Before the trial, tars had not degraded since deposition in the 1970s; however, after planting with willow spilling, evidence of degradation was clear, showing a reduction in n-alkane and PAH concentrations. After 2 years, tar breakdown was only recorded in close association with willow root systems, but after 3 years it was documented in tars not targeted by root growth. Willow also stabilized the tar pit surface, altered its topography, and enabled the establishment of a diverse understory flora and, along with initial liming of the area, contributed to reduced surface pH from highly acidic to neutral. eDNA of microbial communities in tars near willow roots was highly distinct from tars away from roots and surrounding soil. The community around willow roots included species known to process PAHs and hydrocarbons, and also species that aid vegetation growing in stressful environments. Challenges and unforeseen issues during the trial, future work, and knowledge gaps are discussed. https://www.sciencedirect.com/science/article/pii/S0301479726011503/pdfft?md5=1922d0d50b64049799ea08efde31b8dc&pid=1-s2.0-S0301479726011503-main.pdf

COMPLETE DECHLORINATION VIA BIOAUGMENTATION IN PARTIALLY WEATHERED AND FRACTURED BEDROCK [Cleanup News]

Fri, 5 Jun 2026 13:30:04 GMT

Shores, C. | DCHWS East, 4-6 March, Philadelphia, PA, 17 slides, 2026

Remedial response was implemented to achieve complete TCE dechlorination in partially weathered and fractured bedrock using bioaugmentation techniques. The site contained extensive TCE contamination, affecting ~1.5 acres and extending >200 feet deep within saturated partially weathered rock (PWR), saprolite, and fractured bedrock zones. Initially, the PWR was thought to be relatively unsaturated and less significant. However, additional well installations identified substantial TCE contamination within these zones, leading to a revised conceptual site model and the implementation of a focused feasibility study evaluating enhanced bioremediation approaches. Biotreatability evaluations showed favorable pH, temperature, and oxidation-reduction conditions for biological treatment, although naturally occurring Dehalococcoides bacteria were not detected, and daughter product formation was minimal. The remedial strategy centered on bioaugmentation using specialized microbial cultures and electron donor amendments to stimulate reductive TCE dechlorination. A pilot study demonstrated significant TCE reductions and achieved a radius of influence of up to 25 ft; however, complete dechlorination to ethene was not achieved because microbial populations remained below target concentrations and pH conditions likely inhibited bacterial activity. Lessons learned were incorporated into the full-scale remedial response. The final design included permanent injection wells isolated within the partially weathered rock interval, increased buffering capacity to address pH challenges, use of the more robust KB-1 Plus® microbial culture, and significantly higher bacterial dosing. Modifications greatly improved microbial activity and dechlorination performance throughout the source areas. Monitoring results after one year showed Dehalococcoides bacterial concentrations averaging 1.3 × 10^⁸ gene copies/L, well above the project target of 10^⁷ gene copies/L. Significant reductions in TCE and total CVOCs were observed throughout both shallow and deep source areas, including intervals between 45 and 111 ft bgs. The core of the dissolved contaminant plume was effectively eliminated, and the overall plume began to contract as source area concentrations decreased. https://mediacdn.guidebook.com/upload/213717/0EICrVTYvCPT5hB7KoNhNkm2KnkGWTQUDyLb.pdf

FRACTURING METHODS TO DELIVER LIQUID AMENDMENTS TO LOW PERMEABILITY AND HETEROGENEOUS SETTINGS – METHODS AND CASE STUDIES [Cleanup News]

Fri, 5 Jun 2026 13:29:49 GMT

Ross, C. | DCHWS East, 4-6 March, Philadelphia, PA, 19 slides, 2026

This presentation highlights two case studies where fracturing technologies, hydraulic injections, and enhanced delivery systems were used to improve contaminant treatment efficiency and overcome limitations associated with conventional injection methods. The first case study involved a PCE-contaminated site in California, where ZVI was combined with electron donor injections to stimulate enhanced bioremediation and in situ chemical reduction. Specialized fracturing technologies were implemented to improve amendment distribution in low-permeability formations. Sand-filled fracture-enhanced wells were used for SVE, combined with high-velocity water jetting and hydraulic fracturing techniques to create preferential flow pathways for amendment delivery. Fracture-enhanced wells enabled the successful operation of a full-scale SVE system and removal of ~46 lbs of PCE before asymptotic conditions were reached. Groundwater monitoring data showed substantial reductions in PCE and daughter products over time following the injection events, demonstrating effective contaminant degradation and treatment progress. The second case study focused on the Lake City Army Ammunition Plant Area 17B Oil and Solvent Waste Pits, where silty clay and weathered shale limited groundwater flow and amendment distribution. Conventional gravity injection wells achieved relatively low flow rates ranging from 1.0-7.7 gal/d/well. To improve remedial performance, fracture-enhanced injection wells were installed using sand-filled hydraulic fractures connected to the injection wells. Following fracturing, injection performance improved dramatically, with flow rates increasing to 7.8-109 gal/d/well. The enhanced amendment delivery system improved radius of influence and significantly increased contaminant treatment efficiency. Groundwater monitoring results demonstrated treatment reductions ranging from 92% to >99% for total chloroethenes, although some areas associated with NAPL contamination showed lower treatment efficiency. https://mediacdn.guidebook.com/upload/213717/cNnymBhW2PjuIBTrYhhBMa2Eqxp2SkEWk3XG.pdf

IN SITU MONITORING CONSOLIDATION AND HARDENING BEHAVIORS OF AN HDPE GEOMEMBRANE-CEMENT-BENTONITE COMPOSITE CUTOFF WALL [Cleanup News]

Fri, 5 Jun 2026 13:29:33 GMT

Jin, W., Z.-K. Wang, X.-X. Dou, Q.-L. Wang, and Y.-C. Li.
Groundwater Monitoring & Remediation 46(2):33-43(2026)

An in situ multi-parameter monitoring system that includes soil pressure, pore water pressure, and bulk electrical conductivity was installed in a 23.5-m deep HDPE-cement-bentonite (HCB) cutoff wall. The data collected from the first 20 d are presented. The shallow zone (≤2.5 m) became unsaturated after 2 d, triggering surface settlement, CB mixture-geomembrane or CB mixture-trench sidewall detachment, and shrinkage cracks; the intermediate zone (5-7.5 m) developed 80-kPa suction on Day 4, while deeper responses lagged. Lateral pressure showed a V-shaped trend, an initial hydration-induced drop followed by a pressure increase due to bentonite swelling. Bulk electrical conductivity (3000-4000 mS/m) decreased overall but varied with the permeability of surrounding soil. The temperature evolution comprised three distinct stages: hydration heating, cooling, and stabilization.

MULTIPLE AWARD MILITARY MUNITIONS SERVICES (MAMMS IV) INDEFINITE DELIVERY/INDEFINITE QUANTITY (IDIQ) MULTIPLE AWARD TASK ORDER CONTRACT (MATOC) (SRCSGT) [Market/Commercialization]

Fri, 5 Jun 2026 13:29:16 GMT

U.S. Army Corps of Engineers, Sub Command 1, 2, 3, Engineer Division North Atlantic, Baltimore District, Baltimore, MD
Contract Opportunities on SAM.gov W912DR27RA001, 2026

This is a sources sought notice for marketing research purposes only. The U.S. Army Corps of Engineers, Baltimore District, requests letters of interest from qualified contractors interested in performing work on the potential Multiple Award Military Munitions Services Multiple Award Task Order Contract in support of the Environmental Munitions Design Center under NAICS code 562910. The scope involves a wide range of military munitions and environmental services at various sites known or suspected to have been affected by military munitions, Munitions and Explosives of Concern, and Munitions Constituents, with emphasis on addressing CERCLA and RCRA process timelines and requirements. Specific efforts will include all phases of the CERCLA/RCRA process, including, but not limited to, site inspections, remedial investigations, feasibility studies, remedial designs, remedial actions, remedial operations, and long-term management. Additional desired capabilities include investigative and intrusive aspects of MEC and MC remediation, address characterization and/or remediation of co-mingled MEC, MC, and HTRW hazards during all phases of CERCLA and RCRA processes, and the ability to simultaneously manage multiple teams performing work at multiple locations under firm-fixed-price task orders. The Government is exploring the possibility of utilizing a firm-fixed price with economic price adjustment and would like industry feedback on experiences and any benefits seen from it. Although not deemed to be a "Munitions and Explosive of Concern," Small Arms Ammunition (SAA) may be encountered during any phase of the CERCLA and/or RCRA process. Capabilities must include Dynamic Advanced Geophysical Classification and SLAM-based positioning for investigation and cleanup. Letters of interest are due by 12:00 PM EDT on June 29, 2026. https://sam.gov/workspace/contract/opp/bab777c21dc141f0837f3542d9de0b6c/view

AK-KODIAK ADMIN SITE-SOIL CLEAN-UP (SOL) [Market/Commercialization]

Fri, 5 Jun 2026 13:26:02 GMT

U.S. Department of the Interior, U.S. Fish and Wildlife Service, FWS, Construction A/E Team 1, Falls Church, VA
Contract Opportunities on SAM.gov 140FC126Q0023, 2026

This is a full and open competition under NAICS code 562910. The U.S. Fish and Wildlife Service requires a contractor to delineate and characterize petroleum-contaminated soils and check for groundwater contamination in the land farm area, and remove marine lead battery parts and lead-contaminated soil from the beach at the Sheep Island Boat Maintenance Facility at Kodiak National Wildlife Refuge in Alaska. The Contractor shall provide a Site Characterization Report incorporating previous reports and develop a Corrective Action Completion Report (CACR) that discusses the cost and pros/cons of mitigating the site using active remediation, engineered barriers, institutional controls (Land Use Control Plan), or a combination of these methods if contamination remains on-site after completion of this work. The contractor shall provide a final recommendation based on this evaluation and the current data collected during this contract. Sheep Island is a remote island facility with absolutely no known amenities. All supplies and equipment necessary to perform this site survey/soil sampling must be transported to the site. The award will be based on the lowest price deemed fair and reasonable by the Government. The magnitude of construction is between $25,000 and $100,000. Offers are due by 9:00 AM EDT on June 18, 2026. https://sam.gov/workspace/contract/opp/edc8b48127f845d8b517b99301c3474d/view

REGION 2 ERRS RECOMPETE (COMBINE) [Market/Commercialization]

Fri, 5 Jun 2026 13:25:42 GMT

U.S. Environmental Protection Agency, Region 3 Contracting Office, Philadelphia, PA
Contract Opportunities on SAM.gov 68HE0326R0009, 2026

This is a total small business set-aside under NAICS code 562910. EPA seeks a contractor to support its ERRS contract. The purpose of the ERRS contract is to provide fast, responsive environmental cleanup services to the release, or threatened release, of hazardous substances/waste/pollutants and contaminants/materials and petroleum products/oil for the EPA Region 2, which has a geographic area comprised of New Jersey, New York, Puerto Rico, the US Virgin Islands, and eight Indian Nations. Environmental cleanup in response to natural and manmade disasters, terrorist activities, weapons of mass destruction, and chemical, biological, radiological, and nuclear incidents may also be required under this contract. A regional cross-over may be requested under this contract, under rare circumstances, international responses may be required. The award will be an IDIQ contract with a period of performance from January 27, 2027, through January 26, 2035. Offers are due by 10:00 AM EDT on July 20, 2026. https://sam.gov/workspace/contract/opp/26dd719fc2dc439ba8850eff4863f41f/view