Document ID: EPA-HQ-OPP-2002-0334-0004
Agency: epa
Document Type: Supporting & Related Material
Title: 
Posted Date: 2007-09-20T04:00Z

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<p>Michael Barrett EFED EPA - Chair</p>

<p><strong>On this Page</strong></p>

<ul>
<li><a href="#attendees">Attendees</a></li>
<li><a href="#welcome">Welcome and Introductions</a></li>
<li><a href="#action">Review of Old Action Items</a></li>
<li><a href="#brief">Brief Updates</a></li>
<li><a href="#major">Major Topics</a></li>
<li><a href="#next">Next Meeting and Other News Items</a></li>
</ul>

<hr />

<h2 id="attendees">Attendees</h2>

<table class="table zebra" summary="Attendees">
<thead>
<tr><th scope="col">Name</th><th scope="col">Association</th></tr>
</thead>
<tbody>
<tr><td>Alan Rose</td><td>Valent</td></tr>
<tr><td>Alex Clem</td><td>EFED OPP EPA</td></tr>
<tr><td>Andy Newcombe</td><td>Levine-Fricke</td></tr>
<tr><td>Betsy Behl</td><td>EFED OPP EPA</td></tr>
<tr><td>Cathleen Haperman</td><td>USDA/ARS</td></tr>
<tr><td>Claude Beigel</td><td>BASF</td></tr>
<tr><td>Dave Gustafson</td><td>Monsanto</td></tr>
<tr><td>David Jones</td><td>EFED OPP EPA</td></tr>
<tr><td>Dirk Young</td><td>EFED EPA OPP</td></tr>
<tr><td>Don Wauchope</td><td>USDA ARS</td></tr>
<tr><td>Elise D.G. McCoy</td><td>FMC</td></tr>
<tr><td>Faruque Khan</td><td>EFED OPP EPA</td></tr>
<tr><td>James Hetrick</td><td>EFED OPP EPA</td></tr>
<tr><td>Jim Breithaupt</td><td>EFED OPP EPA</td></tr>
<tr><td>Jim Lin</td><td>EFED OPP EPA</td></tr>
<tr><td>Joe Massey</td><td>MS State University</td></tr>
<tr><td>John Fisher</td><td>Bayer</td></tr>
<tr><td>John Jordan</td><td>EFED OPP EPA</td></tr>
<tr><td>Kevin Armbrust</td><td>MSU</td></tr>
<tr><td>Larry Burns</td><td>EPA ORD Athens</td></tr>
<tr><td>Marietta Echeverria</td><td>EFED OPP EPA</td></tr>
<tr><td>Mark Cheplick</td><td>Waterborne Environmental</td></tr>
<tr><td>Mark Corbin</td><td>EFED OPP EPA</td></tr>
<tr><td>Mark Russell</td><td>DuPont</td></tr>
<tr><td>Mark Seaton</td><td>EFED OPP EPA</td></tr>
<tr><td>Mark Shocken</td><td>Uniroyal</td></tr>
<tr><td>Marty Williams</td><td>Waterborne Environmental</td></tr>
<tr><td>Mary Nett</td><td>Water Quality Consulting</td></tr>
<tr><td>Michael Barrett</td><td>EFED EPA - Chair</td></tr>
<tr><td>Michael Winchell</td><td>Stone Environmental</td></tr>
<tr><td>Mike Kenna</td><td>U.S. Golf Association</td></tr>
<tr><td>Mohammed Ruhman </td><td>EFED EPA/OPP</td></tr>
<tr><td>Norman Birchfield</td><td>EFED OPP EPA</td></tr>
<tr><td>Paul Hendley</td><td>Syngenta</td></tr>
<tr><td>Piyush Singh</td><td>DuPont</td></tr>
<tr><td>Qing Li Ma</td><td>ET&S</td></tr>
<tr><td>Ron Parker</td><td>EFED OPP EPA</td></tr>
<tr><td>Russell Jones</td><td>Bayer CropScience</td></tr>
<tr><td>Scott Jackson</td><td>BASF</td></tr>
<tr><td>Stuart Cohen</td><td>ET&S</td></tr>
<tr><td>Susan Alexander</td><td>Stone Environmental</td></tr>
<tr><td>Tammy Estes</td><td>Stone Environmental</td></tr>
<tr><td>Wenlin Chin</td><td>Syngenta</td></tr>
</tbody>
</table>

<p>Also making a short appearance: Steven Bradbury, Director, EFED.</p>

<p class="pagetop"><a href="#content">Top of page</a></p>
<hr />

<h2 id="welcome">Welcome and Introductions</h2>

<p>Michael Barrett opened the meeting at 9:00 and welcomed attendees. The group recorded thanks to Dirk Young and Jim Carleton for serving as EPA co-chairs over the last year.  Michael Barrett and Jim Hetrick are the new EFED Water Tech Team co-chairs.  The last minutes of the EMWG meeting are available on OPP's environmental model web site:
<a href="http://www.epa.gov/oppefed1/models/water/emwg_top.htm">www.epa.gov/oppefed1/models/water/emwg_top.htm</a></p>

<p class="pagetop"><a href="#content">Top of page</a></p>
<hr />

<h2 id="action">Review of Old Action Items</h2>

<ol>
<li><p>All to visit the web site listed above to access the information, especially the   charter presented by Betsy Behl.   <strong>DONE</strong></p></li>

<li><p>CropLife America to send EFED list of email addresses of users on the CLA EMWG list server.  <strong>DONE</strong>  Note: The server does not accept attachments.  Please send copies of files to Betsy Behl and Michael Barrett who will distribute 	them via direct mail.</p></li>

<li><p>EFED to finalize and release revised version of Prospective Ground Water Monitoring Study guidance.  <strong>IN PROGRESS - BETSY WILL UPDATE</strong></p></li>

<li><p>EFED to post policy identifying model versions and scenarios currently used for
estimating environmental exposure to pesticides.  The policy has not yet been posted, but the OPP Web site has been updated.  EXAMS can be found at the following site:
<a href="http://www.epa.gov/ceampubl/swater/index.htm">http://www.epa.gov/ceampubl/swater/index.htm</a>.  Larry Burns indicated that PRZM 3.12 will be posted on the Center for Exposure Assessment Modeling (CEAM) website around February 2003. </p>

<p><a href="http://www.epa.gov/ceampubl/gwater/index.htm"> http://www.epa.gov/ceampubl/gwater/index.htm </a></p></li>

<li><p>EFED will update EMWG with suggested goals for 2003 at December meeting.  <strong>BETSY TO DISCUSS.</strong></p></li>

<li><p>EFED will post letter of positive attributes of models on the models Web site:</p>

<p><a href="http://www.epa.gov/oppefed1/models/water/emwg_top.htm">http://www.epa.gov/oppefed1/models/water/emwg_top.htm.</a> <strong>DONE</strong></p></li>

<li><p>EFED to consider participation in European Union "FOCUS" (tiered modeling 	assessment) groups.  Several EMWG members expressed that it would be good for EFED to attend.  Budget constraints may make it difficult for EFED to attend, but they will keep abreast of developments.  Workshop in U.S. is a possibility.  A similar initiative is under way in the Environmental Fate Tech Team.  Russell Jones to ensure that information goes to Betsy Behl, Faruque Khan, and Mark Corbin.</p></li>

<li><p>All to send copies of their presentations at the September 24, 2002 meeting to EFED for posting on the web.</p></li>

<li><p>EFED to resolve the issue of CN switching in PRZM via discussion with model
originators and current owners.  <strong>TO BE DISCUSSED</strong></p></li>

<li><p>In response to FR Notice, industry will submit detailed comments to EFED on scenarios and an ACCESS database format file comparing all the specific scenario parameters. <strong>DONE</strong>.  Request for comments from Larry.</p></li>

<li><p>Interested parties should evaluate the leaching assessment prototype system (PLUS) available on the Waterborne Web site: 
<a href="http://www.waterborne-env.com">http://www.waterborne-env.com.</a> 
<a href="http://www.epa.gov/epahome/exitepa.htm" title="EPA's External Link Disclaimer"><img src="http://www.epa.gov/epafiles/images/epafiles_misc_exitepadisc.gif" width="87" height="13" alt="Exit EPA Disclaimer" /></a></p>

<p>People are encouraged to review and discuss at the next meeting or via the list  server.  Industry is ready to participate with EFED on ground water development efforts.</p></li>

<li><p>Industry to supply hydrology data from small-scale runoff studies to EPA.  EPA will use these studies to investigate the relationship between curve number and soil moisture. The purpose of this exercise is to determine how to make PRZM run more efficiently.   Dirk Young indicated that industry has submitted three studies that have been analyzed.  The relationship between soil moisture and curve number is similar to previous investigations. EFED is also working with an Australian data set and is waiting for the USDA data.  <strong>Don Wauchope to send Dirk Young the 	USDA runoff data to support work on the curve number program. </strong></p></li>

<li><p>EFED and ORD to correct the curve number documentation.  <strong>Larry will update PRZM documentation in the next version (3.12).</strong></p></li>

<li><p>Ingrid Sunzenauer's presentation from the last EMWG meeting will be posted on the Web: <a href="http://www.epa.gov/oppefed1/ecorisk/index.htm">http://www.epa.gov/oppefed1/ecorisk/index.htm.</a>  <strong>DONE</strong></p></li>

<li><p>EPA to consider adding the EXAMINER tool to the EXPRESS shell.  <strong>TO BE
DISCUSSED.</strong></p></li>

</ol>

<p class="pagetop"><a href="#content">Top of page</a></p>
<hr />

<h2 id="brief">Brief Updates</h2>

<h3>PRZM/EXAMS Model - Larry Burns</h3>

<p>- reported that ORD has checked PRZM 3.12 beta and will be supporting EXPRESS which includes 3.12 beta, 3.12 final and the European version.  ORD has not yet fixed the PRZM code for field capacity and wilting point based estimations.  This problem was discussed at the September EMWG meeting.</p>

<p><strong>Action Item</strong>: ORD to address coding problem for field capacity and wilting point in PRZM. </p>

<h3>Rice Modeling</h3>

<p>The rice model RICEWQ currently has four scenarios.  Jim Breithaupt believes that they
need to add other scenarios that accounts for differences in soils/climate.  EFED would also like to add other types of water bodies to simulate bayous, etc.  They have added a thermal crop growth model to predict growth stage.  This project is awaiting prioritization in the budget for funding.</p>

<h3>WARP - Ron Parker</h3>

<p>- described WARP and the mini-pilot monitoring study that is being conducted
at five sites around the country.  The purpose of this mini-pilot is to investigate the process for selecting sites, evaluate GIS databases to determine if they reflect what is happening, and evaluate the number of samples needed to capture peak concentrations for the sites.  Russ Jones, Jim Hetrick, HED staff, and two USGS scientists will be looking at the mini-pilot data.  They are looking at three specific approaches for calculating daily time streams from percentiles predicted by WARP: variography with conditional simulation (similar to krieging), a Markov chain approach, and a simulated PRZM-EXAMS daily time-step approach.  WARP inputs depend on watershed delineation. </p>

<p> Oak Ridge National Laboratory is working on a tool to identify drinking water intakes
and surrounding catchments -- the QA/QC process is underway for 6,000 watersheds.  They
hope to have the tool available by Spring of this year.  The pesticide usage project is also associated with this project. Industry is also investigating the use of sales data to predict usage.  USGS is working with industry and OPP to develop mechanisms to predict usage at each intake.  The most sensitive factor is amount of pesticide used.  USGS is looking at USDA, industry and DOANE data.  They are currently focusing on flowing water and agricultural uses.  </p>

<p><strong>Action Item</strong>: Michael Barrett and Betsy Behl will invite Gail Thielin from the USGS NAWQA pesticide synthesis group to give a presentation on how they use usage data.</p>

<h3>Turf Umbrella - Mary Nett (Water Quality Consulting)</h3>

<p>- discussed the turf initiative and reported that they are moving ahead on several fronts.  There are now seven industry participants as well as USGA, Mississippi State University, Oklahoma State University, and University of Maryland involved in this pilot study.  They are looking at 10 years of golf course runoff data and validation of current runoff scenarios.  A protocol has been drafted for a field runoff study which is designed to be applicable to any U.S. location.  Mississippi State and University of Maryland turf farm will be part of this project.  They are standardizing the test lot scale (0.2 A - Oklahoma and Georgia plot size), grass species according to the region, sampling and application methods, optimizing turf grass growth based on USGA guidance.  They will use simulated rainfall and test chemicals will be selected and applied in conjunction with simulated events.  </p>

<p><strong>Action Item</strong>: Mary Nett to send Betsy Behl the draft protocol.  Betsy will transmit it to the Water Quality Technical Team.</p>

<h3>Spray Drift Models - Norm Birchfield</h3>

<p>- reported that the Spray Drift Task Force has responded to EFED's concerns.  EFED expects to issue a follow-up response before the next meeting.  EPA is still concerned about the problems associated with the license agreement.  Both ORD and OPP believe that AgDRIFT should have a disclaimer equivalent to the EPA models.  Licensing is not acceptable to ORD because they will use AgDRIFT in a number of other models that are publicly available.  They feel that the letter was a good start, but it is time for industry "to give themselves a gold star and move on."  The Forest Service Model is still a viable alternative to AgDRIFT, and EPA will need to make a decision soon on whether to use AgDRIFT or AgDISP.</p>

<p>Paul Hendley and Russell Jones spoke on behalf of the SDTF and the industry,
respectively.  They assured the group that there had been a lot of discussion within industry and the Task Force to reach agreement on the content of the letter that was issued.  They were also optimistic that they would find a way to address OPP's and ORD's concerns on the use of Ag DRIFT.</p>

<h3>New Meteorological Files and Scenarios</h3>

<p>Industry is concerned about the problems identified with some of the new scenarios that are now publicly available for comment.  </p>

<p><strong>Action Items</strong>: EFED to discuss these scenarios at the next EMWG meeting.  Anyone who wants a copy of industry's comments can request them from Paul Hendley.</p>

<h3>PRZM Temperature Routine - Tammy Estes</h3>

<p>- raised a question about the temperature routine in PRZM.  Currently, PRZM uses the Q10 approach for estimating change in degradation.  The soil temperature module appears to be very sensitive to the starting date for soil temperature, but does not appear to mimic rapid increases in temperature, such as spring warming.  Scott Jackson also said that it does not work.  </p>

<p><strong>Action Item</strong>: Larry Burns, Tammy Estes, Mark Cheplick, Wenlin Chen and others will discuss this issue off-line and report back at the next meeting.  These concerns could be put together and sent out to the list server for discussion. </p>

<p class="pagetop"><a href="#content">Top of page</a></p>
<hr />

<h2 id="major">Major Topics</h2>

<h3>EFED Budget Priorities - Betsy Behl</h3>

<p>- reported that the budget situation has been delayed with continuing resolutions and is under enormous constraints.  The only firm commitment for money and FTE's that can be made at this time is for direct pesticide regulatory issues.  Other additional programs that EFED is tending to support include programs that document and standardize procedures and models, increase consistency in risk assessment, and promote harmonization activities.  Because of the endangered species law suits and water issues, there is interest in supporting tools for permitting analyses at smaller scales.  Tools, such as the vulnerability tool, may be supported.</p>

<p>Industry commented that they were under similar strictures and that these funding pressures emphasize the importance of finding acceptable ways for cooperative action on key projects.</p>

<p><strong>Action Item</strong>: Betsy Behl will discuss at next meeting.</p>

<h3>European Union Modeling Issues - FOCUS - Russell Jones and Mark Russell</h3>

<p>- provided an update on FOCUS and ground water and surface water scenarios.  </p>

<p><strong>Action Items</strong>:  Their presentations will be placed on the EFED Web site.</p>

<h3>PGW Database </h3>

<p>The group will discuss this issue at the next meeting since the request for comments went out a few days before the December meeting.  </p>

<p><strong>Action Item</strong>: Industry will submit written comments by January 31, 2003, and the issue will be discussed at the next EMWG meeting.  </p>

<h3>USDA/ARS and EPA/OPP/EFED Workshop - Don Wauchope</h3>

<p>- reported on a three-day workshop that was held between USDA/ARS and OPP/EFED aimed at improving communications and establishing future inter-Agency links.  The group plans to issue a report on "Science Needs for Credible Mitigation."  The workshop included three breakout sessions: risk mitigation and agricultural practice, experimental study design, and modeling and risk assessment.  The attendees developed useful goals in each of these areas and four future research projects: </p>

<ol>
<li><p>a searchable database of quantifiable mitigation technologies of known effects of mitigation on runoff and groundwater concentrations via the National Ag 	Library;</p></li>
<li><p>a model to aid in the design of the mitigation buffers;</p></li>
<li><p>an approach to quantitative spray drift mitigation; and</p></li>
<li><p>field studies to assess the effectiveness of agricultural mitigation 	measures.</p></li>
</ol>

<p class="pagetop"><a href="#content">Top of page</a></p>
<hr />

<h2 id="next">Next Meeting and Other News Items</h2>

<p>The next EMWG meeting is scheduled for March 19, 2003.  Michael Barrett will
confirm this time via the list server ASAP.</p>

<p>The American Chemical Society soil dissipation workshop is now scheduled for the Fall
2003 ACS meeting.</p>

<h3>Action Items</h3>

<ol>

<li><p>EFED to update group on progress with Prospective Ground Water Monitoring Study guidance at next meeting.</p></li>

<li><p>ORD to post PRZM 3.12 on CEAM site.</p></li>

<li><p>EFED will discuss 2003 goals and budget priorities at next meeting.</p></li>

<li><p>Russell Jones will send information on the EU Kinetics Group to EFED via Betsy Behl.</p></li>

<li><p>Don Wauchope will send Dirk Young the USDA runoff data to support work on the curve number program.</p></li>

<li><p>EMWG members are encouraged to try the EXAMINER tool for visualizing modeloutput data (via Paul Hendley or Waterborne).  EPA will consider adding the EXAMINER tool to the EXPRESS shell and discuss at the next meeting.</p></li>

<li><p>Interested members should evaluate the PLUS (a privately developed ground-water exposure assessment tool) alpha leaching code and discuss at the next meeting or via the list server.  The code is available on the Waterborne Web site:	</p>

<p><a href="http://www.waterborne-env.com">http://www.waterborne-env.com.</a>
<a href="http://www.epa.gov/epahome/exitepa.htm" title="EPA's External Link Disclaimer"><img src="http://www.epa.gov/epafiles/images/epafiles_misc_exitepadisc.gif" width="87" height="13" alt="Exit EPA Disclaimer" /></a></p></li>

<li><p>EFED to resolve the issue of CN switching in PRZM via discussion with model originators and current owners.</p></li>

<li><p>PGW database issues to be discussed at next EMWG meeting; industry to submit written comments by January 31, 2003.</p></li>

<li><p>ORD to address coding problem for field capacity and wilting point in PRZM.	</p></li>

<li><p>Betsy Behl and Michael Barrett will invite Gail Thielin from USGS to give a
presentation on how they use usage data.</p></li>

<li><p>EMWG to discuss public comments on PRZM EXAMS scenarios at next meeting.</p>	</li>

<li><p>Mary Nett to send Betsy Behl the draft protocol for the turf runoff field study.  Betsy will transmit the protocol to the Water Tech Team for review.</p>	</li>

<li><p>Larry Burns, Mark Cheplick, Tammy Estes, Wenlin Chen and others will discuss the temperature dependent PRZM code issues off-line and report back to the group.  An example of the concerns could also be sent out to the list server for discussion. </p></li>

<li><p>Mark Russell and Russell Jones to send copies of their presentations on European modeling to Betsy Behl for posting on the Models Web site.</p></li>

<li><p>Don Wauchope to send presentation to Betsy for posting on the Models Web site.</p></li>

<li><p>Michael Barrett to confirm the date of the next meeting via the list server 	ASAP.</p>

<p>The tentative date is March 19, 2003 at 9:00 a.m.   </p></li>

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