U.S. EPA Contaminated Site Cleanup Information (CLU-IN)

U.S. Environmental Protection Agency
U.S. EPA Technology Innovation and Field Services Division

Recent Additions

Preliminary Assessment/Site Inspection (PA/SI)

Posted: April 11, 2014

The CERCLA Education Center (CEC) is offering a nine-part Preliminary Assessment and Site Inspection (PA/SI) Webinar Series in June and July 2014. PA/SI is an intermediate training course designed for personnel who are required to compile, draft and review PA, SI and HRS documentation records and packages submitted for sites proposed for the National Priorities List (NPL). This course is open to EPA, federal, state, tribal and contractor personnel who support site investigation programs. The PAS/SI Webinar Series provides an introduction to the Superfund site assessment process and describes the preliminary assessment and site inspection phases of this process. The course will incorporate a mix of lecture and exercises using Quickscore for each of the four pathways. The objective of the exercise is to give participants the opportunity to evaluate and score PA information using the HRS Quickscore software. Participants will use information from a fictitious site to (1) evaluate and calculate a preliminary HRS score, and (2) develop release and target hypotheses that should be pursued in an SI.

Superfund and Renewable Energy: Promising Futures for Sites with a Contaminated Past, April 29

Posted: April 8, 2014

EPA has placed national priority on showcasing opportunities for the development of clean and renewable energy projects on contaminated lands. EPA's Superfund Redevelopment Initiative (SRI) supports the use of renewable energy at Superfund sites and has actively provided site owners and local communities with technical support and resources to explore innovative reuse opportunities available at these sites. Highlighting SRI's support activities as well as case studies from sites with solar projects in place and generating electricity, this webinar will highlight how EPA worked with site stakeholders and solar developers to design and enable renewable energy project fully compatible with long-term protectiveness of a site. It will also focus on the challenges and benefits found in developing a large solar facility on formerly contaminated sites (e.g., landfills) and highlight the role of these sites in supporting development and how local communities and site owners can see economic and environmental impacts from renewable energy development on current and formerly contaminated lands.

Reference Guide to Treatment Technologies for Mining-Influenced Water

Posted: April 1, 2014

This report highlights select mining-influenced water (MIW) treatment technologies used or piloted as part of remediation efforts at mine sites. It is intended to provide information on treatment technologies for MIW to federal, state and local regulators, site owners and operators, consultants, and other stakeholders. Included in the report are short descriptions of treatment technologies and information on the contaminants treated, pre-treatment requirements, long-term maintenance needs, performance, and costs. Sample sites illustrate considerations associated with selecting a technology. Website links and sources for more information on each topic are also included.

Perchlorate Destruction and Potable Water Production Using Membrane Biofilm Reduction: Final Report Addendum

Posted: March 19, 2014

This report summarizes the findings of research carried out at Arizona State University in parallel with a field pilot study (detailed in the main project report at

SERDP and ESTCP Workshop On Vapor Intrusion Into Indoor Air From Contaminated Groundwater

Posted: March 19, 2014

SERDP/ESTCP sponsored the vapor intrusion (VI) workshop that was held in Tempe, Arizona, in December 2013 to develop a path forward for DoD investments in VI assessment. This report presents the resulting needs for VI research and technology transfer.

Monitored Natural Recovery at Contaminated Sediment Sites

Posted: March 19, 2014

To provide background for future sediment remediation at the Middle River Complex site, this Project Note gives a general description of monitored natural recovery (MNR), a partial list of sediment remediation projects where MNR has been applied, and several case study reviews of projects that utilized MNR as a component of the remedy.

1,4-Dioxane: the Emerging Contaminant That Keeps On Emerging

Posted: March 19, 2014

This presentation by recognized expert Thomas Mohr provides background information on the use and occurrence of 1,4-dioxane; the chemical properties that govern its fate and transport; and challenges and solutions to its analysis in the laboratory. Field examples are provided to illustrate plume dynamics and 1,4-dioxane treatment challenges and costs. The final section discusses common misconceptions about the compound. [NOTE: The presentation begins on slide 9. ]

Petroleum Products Corporation, 3130 Southwest 17th Street, Pembroke Park, Florida (Hwc # 023)

Posted: April 3, 2014

Bioslurping involves simultaneous vacuum extraction of free product, soil gas, and groundwater from air-tight wells. Following a successful pilot test in 1997, full-scale bioslurping of LNAPL waste oil was conducted nearly round the clock at the Petroleum Products Corporation Superfund Site from 1999 until 2012, when recovery declined. Site data, including bioslurper operations and water quality, were incorporated into a GIS database to monitor remediation progress and support optimization of system performance. The bioslurp system was shut down from April to September 2000 to address extensive oil emulsification in the extracted groundwater, which blocked the carbon polishing system. The system design was refined by the addition of a chemical treatment to inhibit emulsification. Florida DEP fact sheet:

Vapor Intrusion (VI) Exposures: the Challenges Of, Need For, and Benefits of Long Term Stewardship

Posted: April 3, 2014

This one-day technical workshop focused on scientific observations and evidence regarding the accessibility and predictability of vapor intrusion (VI) exposures. The workshop presented evidence for the optimal condition and frequency of ongoing monitoring and protection from VI exposure under both natural (varying) and engineered (controlled) attenuation scenarios. The workshop included panel discussions on how the evidence relates to related risk management decision-making and response actions (i.e., balancing criteria) for VI mitigation strategies, as well as case studies of long-term management and refinement of mitigation approaches. Some presentations are posted with both audio and slides and others with slides only.

Remediation Technologies for Hexavalent Chromium Contaminated Aquifers

Posted: April 3, 2014

This review summarizes updated information on in situ remediation technologies for Cr(VI)-contaminated aquifers, with detailed attention to both biotic and abiotic reduction processes as well as precipitation and sorption mechanisms that can be used for chromium immobilization and remediation in contaminated groundwater.

Use of Compound-Specific Stable Isotope Analysis to Distinguish Between Vapor Intrusion and Indoor Sources of VOCs

Posted: April 17, 2014

This demonstration was conducted to validate use of compound-specific stable isotope analysis (CSIA) to distinguish between vapor intrusion and indoor sources of VOCs. As part of the project, a step-by-step protocol was developed that can be used to provide an independent line of evidence to determine whether or not buildings are affected by vapor intrusion.

Use of On-Site Gc/Ms Analysis to Distinguish Between Vapor Intrusion and Indoor Sources of VOCs

Posted: April 17, 2014

Rapid on-site analysis of indoor air samples using a portable GC/MS allows the user to understand the distribution of VOCs in real time, supporting identification of the source while in the field. The overall objective of the demonstration was to develop and validate a step-wise investigation procedure using commercially available off-the-shelf on-site GC/MS analysis (a portable HAPSITE unit) with real-time decision-making as a tool to distinguish between vapor intrusion and indoor sources of VOCs. Results from concurrent conventional vapor intrusion and compound-specific stable isotope analysis investigations were compared with the GC/MS results to evaluate the relative effectiveness of the different investigation approaches.

Soil, Plant, and Terrain Effects On Natural Perchlorate Distribution in a Desert Landscape

Posted: April 17, 2014

Although perchlorate is found in rocket fuel and fertilizers, the compound also occurs naturally. Scientists from the U.S. Geological Survey and Texas Tech University quantified natural levels of perchlorate in desert soil, plants, and atmospheric materials and identified the factors that control its natural cycling and accumulation. These new findings quantify natural perchlorate background levels and provide basic data on perchlorate distribution and cycling that are pertinent to the assessment of environmental impacts in desert ecosystems and broadly transferable to anthropogenically contaminated systems.

Framework for Site Characterization for Monitored Natural Attenuation of Volatile Organic Compounds in Ground Water

Posted: April 17, 2014

Site characterization is essential to provide site-specific data and interpretations to determine if site remedial goals can be met with monitored natural attenuation (MNA) in appropriate remedial time frames, and to provide site-specific data and interpretations to determine the necessary performance monitoring parameters, locations, and frequency for monitoring. A broad overview of technical issues includes development of a conceptual site model, characterization variables, sampling locations and frequencies, problematic issues encountered at MNA sites and approaches to overcome them, and the interpretations related to the MNA decision-making process. This document focuses on characterization of sites where MNA is being considered for remediation of the portion of the site with dissolved-phase VOC (mainly chlorinated solvent and petroleum hydrocarbon compounds) groundwater contamination.

Mercury-Added Products Fact Sheets

Posted: April 17, 2014

Fact sheets on nine types of products summarize data provided by manufacturers and distributors of mercury-added products. The fact sheets cover the amount of mercury used in the products, why mercury has been or continues to be used in the products, who manufactures the products, and other information. A tenth fact sheet summarizes the use of mercury across all product categories and includes a trends analysis of mercury use in products from 2001-2010.