US EPA TechDirect June 1, 2010
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TechDirect's purpose is to identify new technical, policy and  
guidance resources related to the assessment and remediation of  
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Special Announcement  
EPA Accepting Technology Solution Submissions Related to the BP  
Spill in the Gulf of Mexico. EPA has created a single site for  
technology solution submissions related to the response and  
clean up of the BP Oil Spill in the Gulf of Mexico. All  
submissions will be forwarded to the appropriate reviewing  
official, who will contact submitters if needed. Please refer to  
the instructions listed on the submission form regarding the  
types of information that will be accepted. For questions about  
the response, call the Joint Information Center at 985-902-5231  
or 985-902-5240. Submission forms and instructions are available  
at ... .  
Upcoming Live Internet Seminars  
ITRC Phytotechnologies - June 15, 2010, 2:00PM-4:15PM EDT  
(18:00-20:15 GMT). This training familiarizes participants with  
ITRC's Phytotechnology Technical and Regulatory Guidance and  
Decision Trees, Revised (Phyto-3, 2009). This document provides  
guidance for regulators who evaluate and make informed decisions  
on phytotechnology work plans and practitioners who have to  
evaluate any number of remedial alternatives at a given site.  
This document updates and replaces Phytoremediation Decision  
Tree (Phyto-1, 1999) and Phytotechnology Technical and  
Regulatory Guidance Document (Phyto-2, 2001). It has merged the  
concepts of both documents into a single document. This guidance  
includes new, and more importantly, practical information on the  
process and protocol for selecting and applying various  
phytotechnologies as remedial alternatives. For more information  
and to register, see or .  
Stable Isotope Analyses to Understand the Degradation of Organic  
Contaminants in Ground Water - June 16, 2010, 2:00PM-4:00PM EDT  
(18:00-20:00 GMT). When organic contaminants such as benzene,  
TCE or MTBE are degraded, the ratio of the stable isotopes of  
carbon in the organic contaminants will often change in a  
predictable fashion. This webinar will briefly review the theory  
behind isotopic effects, it will explain the units used to  
characterize the ratio of isotopes, and it will discuss the  
simple mathematics that can relate the shift in the ratio to the  
extent of degradation. Then the webinar will illustrate an  
approach to estimate rate constants for natural biodegradation  
of contaminants in ground water. The isotope analysis will be  
used to estimate the extent of natural biodegradation of MTBE at  
a gasoline spill site. The extent of biodegradation will be  
combined with the hydrological parameters at the site to  
estimate rate constants for biodegradation. The webinar will  
conclude with a number of cautions and warnings. Heterogeneity  
in flow paths in the aquifer and proximity to NAPL or other  
source of contamination to ground water can substantially  
confuse the interpretation of stable isotope data. Both these  
conditions cause the isotope analysis to underestimate the  
extent of degradation. Heterogeneity in the rate of  
biodegradation can produce substantial errors in the forecasts  
of plume behavior. The webinar will provide recommendations to  
deal with the effects of heterogeneity in rates of  
biodegradation. For more information and to register, see .  
ITRC In Situ Bioremediation of Chlorinated Ethene - DNAPL Source  
Zones - June 22, 2010, 2:00PM-4:15PM EDT (18:00-20:15 GMT).  
Treatment of dissolved-phase chlorinated ethenes in groundwater  
using in situ bioremediation (ISB) is an established technology;  
however, its use for DNAPL source zones is an emerging  
application. This training course supports the ITRC Technical  
and Regulatory Guidance document In Situ Bioremediation of  
Chlorinated Ethene: DNAPL Source Zones (BioDNAPL-3, 2008). This  
document provides the regulatory community, stakeholders, and  
practitioners with the general steps practitioners and  
regulators can use to objectively assess, design, monitor, and  
optimize ISB treatment of DNAPL source zones. For more  
information and to register, see or .  
ITRC Enhanced Attenuation of Chlorinated Organics: A Site  
Management Tool - June 29, 2010, 2:00PM-4:00PM EDT (18:00-20:00  
GMT). This training on the ITRC Technical and Regulatory  
Guidance for Enhanced Attenuation: Chlorinated Organics (EACO-1,  
2008) describes the transition (the bridge) between aggressive  
remedial actions and MNA and vise versa. Enhanced attenuation  
(EA) is the application of technologies that minimize energy  
input and are sustainable in order to reduce contaminant loading  
and/or increase the attenuation capacity of a contaminated plume  
to progress sites towards established remedial objectives.  
Contaminant loading and attenuation capacity are fundamental to  
sound decisions for remediation of groundwater contamination.  
This training explains how a decision framework which, when  
followed, allows for a smooth transition between more aggressive  
remedial technologies to sustainable remedial alternatives and  
eventually to Monitored Natural Attenuation. This training will  
demonstrate how this decision framework allows regulators and  
practitioners to integrate Enhanced Attenuation into the  
remedial decision process. For more information and to register,  
see or .  
Using Ecological-Based Tools and Approaches to Assess  
Bioavailability - June 30, 2010, 1:30PM-3:30PM EDT (17:30-19:30  
GMT). The Superfund Research Program (SRP) presents 'Using  
Ecological-Based Tools and Approaches to Assess Bioavailability'  
featuring Dr. Kim Anderson (Oregon State University) and Dr.  
Celia Chen (Dartmouth College). Dr. Anderson's presentation will  
demonstrate the sensitivity of the BRIDGES bio-analytical tool  
for detecting spatially distinct toxicity in aquatic systems;  
bridging environmental exposure to biological response. Dr.  
Chen's presentation will cover work conducted in both freshwater  
and estuarine ecosystems through a combination of field and  
experimental studies that investigated the factors that  
influence the trophic transfer of methylmercury from the bottom  
of the food web up to fish that humans consume. This is the  
second session of the RiskeLearning Spring/Summer 2010 series  
'Ecological Risk: New Tools and Approaches.' For more  
information and to register, see .  
New Documents and Web Resources  
May 2010 State Coalition for Remediation of Drycleaners  
Newsletter. The State Coalition for Remediation of Drycleaners  
(SCRD) produces a newsletter to announce recent events and  
undertakings. The May 2010 issue discusses state and national  
updates, state progress on remediation of drycleaning sites,  
remedial technologies employed at SCRD drycleaning sites, and  
upcoming events (May 2010, 8 pages). View or download at ... .  
EUGRIS Corner. EUGRIS Corner. New Documents on E 
Posted: 02/06/2010 By: Professor Paul Bardos