As summarized in recent reports released by the EPA, ITRC, NRC, and SERDP, the presence of denser-than-water immiscible liquids (DNAPLs) in the subsurface remains as one of the most critical issues associated with hazardous waste sites. Immiscible liquids serve as long-term sources of contamination, and their presence can greatly impact the costs and time required for site remediation. To accurately assess the human health risks associated with DNAPLs in the subsurface, and to design effective remediation systems for such contamination, it is essential to understand contaminant mass-transfer and massflux behavior associated with DNAPL source zones. The contaminant mass flux or mass discharge emanating from a source zone, also referred to as the source strength or source function, is a primary determinant of the risk associated with a contaminated site. Concomitantly, the reduction in mass flux achieved with a specific level of source-zone mass removal (or mass depletion) is a key metric for evaluating the effectiveness of a source-zone remediation effort. Thus, there is great interest in characterizing, estimating, and predicting relationships between mass flux reduction and mass removal. The nature of the relationship between mass flux reduction and mass removal will be mediated by the properties and distribution of the porous medium and of the DNAPL (source-zone architecture), and their resultant impacts on the pore-water velocity field and mass-transfer dynamics. In addition, the relationship between mass flux reduction and mass removal may change with time due to temporal changes in source-zone architecture and mass-transfer dynamics (i.e., source-zone aging). Furthermore, the mass-flux-reduction/mass removal relationship may be affected by source-zone remediation efforts. These issues will be illustrated using the results of studies spanning a range of spatial and temporal scales. To view the slides associated with this audio, please visit http://www.clu-in.org/conf/tio/toolkitdnapl_012208/

The Wastewater Information System Tool (TWIST) is a Microsoft Access based information management system developed for US EPA to help communities inventory and manage decentralized (i.e., individual and clustered) wastewater systems. The Webcast will provide an overview of watershed and water quality issues related to wastewater management, discuss treatment system options and management, and address the need for inventory systems such as TWIST. The Webcast will also provide an introduction on how to use TWIST and discuss how it can be used to track onsite and clustered sewage systems. Finally, the Webcast will also provide information on other tools for small communities and decentralized system users. To view the slides associated with this audio, please visit http://www.clu-in.org/conf/tio/owTWIST_011608/

The Wastewater Information System Tool (TWIST) is a Microsoft Access based information management system developed for US EPA to help communities inventory and manage decentralized (i.e., individual and clustered) wastewater systems. The Webcast will provide an overview of watershed and water quality issues related to wastewater management, discuss treatment system options and management, and address the need for inventory systems such as TWIST. The Webcast will also provide an introduction on how to use TWIST and discuss how it can be used to track onsite and clustered sewage systems. Finally, the Webcast will also provide information on other tools for small communities and decentralized system users. To view the slides associated with this audio, please visit http://www.clu-in.org/conf/tio/owTWIST_011608/

This seminar will provide a summary of the Strategic Environmental Research and Development Program (SERDP) development and opportunities for interested researchers to conduct research and development. This "how to play" briefing will offer essential information for those who wish to understand new funding opportunities within SERDP. The FY09 SERDP solicitation was released on November 8, 2007 and attendees may use this time to ask general questions about the solicitation. To view the slides associated with this audio, please visit http://www.clu-in.org/conf/tio/serdpfunding_121407/

This seminar will provide a summary of the Strategic Environmental Research and Development Program (SERDP) development and opportunities for interested researchers to conduct research and development. This "how to play" briefing will offer essential information for those who wish to understand new funding opportunities within SERDP. The FY09 SERDP solicitation was released on November 8, 2007 and attendees may use this time to ask general questions about the solicitation. To view the slides associated with this audio, please visit http://www.clu-in.org/conf/tio/serdpfunding_121407/

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