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

Two Technical Guides to Support Vapor Intrusion Assessment and Mitigation Activities

Posted: July 10, 2015

The U.S. EPA has issued two technical guides to support vapor intrusion assessment and mitigation activities. The Technical Guide for Assessing and Mitigating the Vapor Intrusion Pathway from Subsurface Vapor Sources to Indoor Air applies to all sites being evaluated under federal land cleanup statutes by EPA, other federal agencies, state and tribal governments and brownfield grantees. A companion document, the Technical Guide for Addressing Petroleum Vapor Intrusion at Leaking Underground Storage Tank Sites addresses any sites where vapor intrusion related to petroleum contamination from underground storage tanks is a potential concern. Both guides are applicable to residential and non-residential settings.

Spring 2015 Technology News and Trends

Posted: June 22, 2015

This issue highlights innovative approaches for remediating sites that are contaminated due to the presence of mining-influenced water or solid waste associated with the mining of hard rock, coal or uranium. Mining operations, both past and ongoing, can create a host of contamination issues, including the release of contaminants of concern such as arsenic, cadmium, copper, lead and zinc, into soil and groundwater. Much of the contamination is associated with acid rock drainage generated when surface water or groundwater comes into contact with acid-generating mine wastes or with bedrock exposed by mining processes. The projects featured in this issue illustrate the collaboration between federal partners, such as the U.S. Bureau of Land Management, EPA and Forest Service, and state agencies, tribes and other stakeholders, to find solutions for mining sites and identify cost-effective and low-maintenance treatment systems for mine site cleanups.

Technical Guide for Assessing and Mitigating the Vapor Intrusion Pathway From Subsurface Vapor Sources to Indoor Air

Posted: July 7, 2015

This guide presents EPA's technical recommendations based on current understanding of vapor intrusion into indoor air from subsurface vapor sources. One of its main purposes is to promote national consistency in assessing the vapor intrusion pathway while providing a flexible science-based approach to assessment that accommodates the different circumstances in which vapor intrusion is first considered at a site. The guide is intended for use at any site (and any building or structure on a site) being evaluated by EPA pursuant to CERCLA or the corrective action provisions of RCRA, EPA's brownfield grantees, or state agencies acting pursuant to CERCLA or an authorized RCRA corrective action program where vapor intrusion may be of potential concern. This document and the 2015 Technical Guide for Addressing Petroleum Vapor Intrusion at Leaking Underground Storage Tank Sites supersede and replace EPA's 2002 draft vapor intrusion guidance.

Technical Guide for Addressing Petroleum Vapor Intrusion at Leaking Underground Storage Tank Sites

Posted: July 7, 2015

This document provides technical information to EPA, state, tribal, and local agency regulatory personnel for investigating and assessing petroleum vapor intrusion (PVI) at sites where petroleum hydrocarbons have been released from underground storage tanks. The guide comprises two parts. The first part briefly describes EPA's recommended approach for addressing PVI, and the second part provides detailed supporting technical information.

Guidance for Communicating Vapor Intrusion at Environmental Restoration Sites

Posted: July 7, 2015

This guide is designed to provide Navy Environmental Restoration Program Remedial Project Managers with recommendations for notifying and relaying information regarding vapor intrusion (VI) investigations to Base personnel and potentially affected occupants of industrial, office, or residential buildings at Navy activities. In addition to a communication strategy, the document provides example fact sheets, notification letters, and posters that explain what VI is and how to mitigate it.

Technical Memorandum: Rationale and Efficacy of Amending Soils With Phosphate as Means to Mitigate Soil Lead Hazard

Posted: July 7, 2015

Of the numerous agents that have been explored for their potential to render soil Pb less bioavailable or less mobile in soil, phosphate agents have been studied most extensively for their effects on oral bioavailability of Pb. This technical memorandum summarizes the major findings and conclusions reported in greater detail in a 2013 review by Scheckel et al., "Amending soils with phosphate as means to mitigate soil lead hazard: A critical review of the state of the science," in the Journal of Toxicology and Environmental Health B (16(6):337-380).