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<p>Meeting took place at the George Washington Carver Center,
ARS Beltsville on June 18, 2002.  The meeting started around 0930 and finished at 1515.</p>

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

<ul>
<li><a href="#attendees">Attendance</a></li>
<li><a href="#welcome">Welcome and Introductions</a></li>
<li><a href="#action">New and continuing ACTION Items</a></li>
<li><a href="#presentations">Presentations</a></li>
<li><a href="#other">Other Important Business Matters, Suggestions, and Next Meeting Date</a></li>
</ul>

<hr />

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

<table class="table zebra" summary="Attendance">
<thead>
<tr><th scope="col">Name</th><th scope="col">Association</th></tr>
</thead>
<tbody>
<tr><td>Jim Carleton</td><td> EFED EPA OPP - Chair</td></tr>
<tr><td>Betsy Behl </td><td>EFED EPA OPP</td></tr>
<tr><td>Rudi Pisigan Jr.  </td><td>EFED EPA OPP</td></tr>
<tr><td>Mah Shamim </td><td>EFED EPA OPP</td></tr>
<tr><td>Jim Breithaupt </td><td>EFED EPA OPP</td></tr>
<tr><td>Richard Lee  </td><td>EFED EPA OPP</td></tr>
<tr><td>Mark Corbin </td><td>EFED EPA OPP</td></tr>
<tr><td>Sid Abel </td><td>EFED EPA OPP</td></tr>
<tr><td>Larry Burns </td><td>EPA ORD Athens</td></tr>
<tr><td>Joe Bagdon  </td><td>USDA NRCS</td></tr>
<tr><td>Nga Tran </td><td>Exponent</td></tr>
<tr><td>Jason Johnston </td><td>Exponent</td></tr>
<tr><td>Pat Havens  </td><td>DowAgro</td></tr>
<tr><td>Tom Gilding  </td><td>Crop Life America (CLA)</td></tr>
<tr><td>Paul Reibach </td><td>Cerexagri Inc</td></tr>
<tr><td>Randy Wientraub </td><td>Cerexagri Inc</td></tr>
<tr><td>Scott Jackson </td><td>BASF</td></tr>
<tr><td>Mark Shocken </td><td>Uniroyal</td></tr>
<tr><td>Katherine Carr </td><td>Monsanto</td></tr>
<tr><td>Wenlin Chen </td><td>Syngenta</td></tr>
<tr><td>Marty Williams </td><td>Waterborne Environmental Inc.</td></tr>
<tr><td>Quing Li Ma </td><td>ET&S</td></tr>
<tr><td>Stuart Cohen </td><td>ET&S</td></tr>
<tr><td>Piyush Singh  </td><td>Dupont</td></tr>
<tr><td>Mary Nett </td><td>Water Quality Consulting</td></tr>
<tr><td>Nancy Ragsdale </td><td>USDA ARS</td></tr>
<tr><td>Catherine Hapeman </td><td>USDA ARS Environmental Quality Lab</td></tr>
<tr><td>John Fisher </td><td>Bayer</td></tr>
<tr><td>Paul Hendley  </td><td>Syngenta</td></tr>
<tr><td>David Healey </td><td>Stone Environmental</td></tr>
<tr><td>Paul Schwartz </td><td>USDA ARS</td></tr>
<tr><td>Walter Schmidt </td><td>ARS/EQL</td></tr>
<tr><td>Rodney Bennett </td><td>Cerexagri Inc</td></tr>
<tr><td>Evert Byington </td><td>ARS</td></tr>
<tr><td>Chris Wible </td><td>Scotts Company</td></tr>
<tr><td>Richard Flethcher </td><td>Cleary Chemical</td></tr>
<tr><td>T. S. Ramanarayanan </td><td>Aventis</td></tr>
</tbody>
</table>

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

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

<p>Jim Carleton opened the meeting and thanked Nancy Ragsdale and USDA for arranging this meeting opportunity.  Nancy Ragsdale responded and provided background information.  The minutes of the last meeting were accepted as written, they are available on the EPA website.</p>

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

<h2 id="action"> New and continuing ACTION Items</h2>

<h3>Continuing items after today's meeting include:</h3>

<ol style="list-style-type:lower-roman">

<li><p>Industry members to review the GENEEC2/FIRST programs thoroughly.</p></li>

<li><p>Betsy Behl/Sid Abel to provide the electronic file of the draft Scenario QC document for the minutes -- <strong>Done.</strong></p></li>

<li><p>Industry to review the revised scenarios using "benchmark chemicals" to identify anomalies.</p></li>

<li><p>Registrants to consider submitting electronic data from PGW studies as a step in developing the PGW database.  Michael Barrett is working on a template to facilitate submission in this form, and is open to suggestions on how to structure the database.</p></li>

<li><p>EFED to finalize and send out revised version of PGW guidance.</p></li>

<li><p>EFED to send out the draft of the QA/QC plan for newly developed/modified models for comment via the OPP website - <strong>Pending replacement for Laurence Libelo -
needs to be addressed at a future meeting</strong></p></li>

<li><p>Russell Jones to send the FOCUS Kinetics team remit to Betsy and look into why she did not receive the invitation.  Betsy will inquire within EFED to decide if they will participate. - <strong>Betsy has heard nothing further on this, EPA mail still delayed - PH to check whether there is still a chance for EFED involvement as the start of the FOCUS group has been delayed till September</strong> </p></li>

<li><p>Consider adding the development of a USA-wide depth to groundwater layer as an agenda item at a future meeting.</p></li>

<li><p>Larry Burns to send a message via the EMWG listserver when the SAMSON data becomes <strong>available - Sid Abel reported that 100 SAMSON datasets are now available with EPA - aiming for late Augusts to evaluate and QC.</strong> </p></li>

<li><p>EFED to resolve the issue of which AgDrift version should be used for submissions, and post on the web. </p></li>

</ol>

<h3>New items</h3>

<ol style="list-style-type:lower-roman">

<li><p>Evert Byington to send out details of the meeting findings to interested EMWG members either by direct contact via business card or over the EMWG list server.</p></li>

<li><p>All to read the ET&S turf scenario comments sent via the list server and respond via the list server to ensure open discussion.</p></li>

<li><p>Industry to start to review new scenarios as they become available.</p></li>

<li><p>Anyone with time and energy to participate in developing the rice model with EFED should contact Betsy Behl.</p></li>

<li><p>All to use the list server more often for open discussion.</p></li>

<li><p>All to send copies of presentations to the meeting on the list server.</p></li>

<li><p>EFED to plan to update EMWG with suggested goals for 2003 at September or December meeting.</p></li>

<li><p>Next meeting to be at EPA Crystal City on September 24<sup>th </sup>.</p></li>

</ol>

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

<h2 id="presentations">Presentations</h2>

<h3>USDA ARS information - Nancy Ragsdale, Cathleen Hapeman</h3>

<p>Nancy Ragsdale presented an informative video describing how ARS science has impacted US food, fiber and pharmaceuticals</p>

<p>Cathleen Hapeman provided an overview of the activities of the USDA ARS Environmental Quality Lab with a particular focus on the areas of relationships between Water Quality and Ag practices, atmospheric deposition of pesticides and IR4.  There appeared to be strong overlap between her programs and the interests of the EMWG.</p>

<p><strong>ACTION: Cathleen to make her presentation available if possible.</strong></p>

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

<p>- provided a preview of this potential program.  The purpose is to develop a cohesive program of data generation, collection and reporting of turf runoff and chemical transport information in order to support modeling and scenario development initiatives to better understand pesticide and nutrient fate and transport.  At present there is broad interest from many stakeholders but no concrete budget or commitment to funding from industry or any other potential participants.</p>

<p>A workshop has been suggested and it is possible that it could be hosted by either SETAC or ACS.  Betsy Behl welcomed the proposal and the level of interest provided this
is seen as a way of updating, expanding and moving beyond the state of the art today (especially regarding scenarios).  Areas of discomfort included mention of specific chemicals and discussion of risk issues as opposed to exposure.  As a suggestion, Betsy suggested that mitigation alternatives in addition to buffers be considered.  Sid Abel suggested that the program consider including GW and holding ponds and include additional areas (e.g. Florida and the West).  Jim Carleton mentioned the importance of residential lawn runoff and homeowners uses (DWARA program mentioned for home owner study). How do we compare data between Ag and urban applications - there is a prime need for usage data (time and amounts), this may be being collected by ORTF.  NASS may be the source of data at the county level but this is based on tax receipts; problems exist between marrying survey and use data.  Watershed heterogeneity presents modeling challenges - particularly given the uncertainties about turf pesticide use and timing relative to traditional Ag uses.  EPA has an interest in SSRO approach.  A program such as this needs strong
coordination to draw together many disparate threads.  Rama suggested links with the USDA ARS Temple TX golf course monitoring study.</p>

<p>Evert Byington from USDA rangeland, pasture and forage group discussed their role of solving public issues.  The group suffers from funding constraints but "budget add-ons" have provided large recent increases.  In January, 50 turf users attended a USDA conference (industry did not attend) hosted by Kevin Morris of National Turf Evaluation Program (industry representative based at ARS) Topics included: </p>

<ul>

<li>Genomics and new varieties development (industry have added to funds over several
years)</li>
<li>Water use</li>
<li>Non-target impacts</li>
<li>Pest management</li>
<li>Soils - human made soils</li>
<li>Integration into a system</li>

</ul>

<p>ARS is a key host to this sort of activity due to their overall goals and  responsibilities.  A broader document will be issued to summarize findings of the January meeting and the turf industry will do something similar to the way that horticulture industry have recently tackled developing a cooperation with ARS.  Evert Byington indicated he would send out details of the meeting findings to interested EMWG members either by direct contact via business card or over the EMWG list server.</p>

<h3>Turf presentation (Stuart Cohen -  ET&S)</h3>

<p>Stuart mentioned an analysis he had just conducted of the existing turf scenarios; Jim Carleton pointed out that EFED primarily established a <em>procedure</em> for creating turf scenarios; the two provided by EFED so far are not the only ones possible.  New scenarios will be developed out of existing crop scenarios in the future as needed.  Betsy Behl pointed out that the current two have been QA'd and are considered final.  She noted that a full and adequate opportunity for comments was also provided to EMWG, and little feedback (and no outright disagreement) was received in return.  Any proposal made now for potential revision of the scenarios that might be made is unlikely to be considered before the middle of next year.</p>

<p>Stuart discussed three documents sent out on the EMWG list server by ETS, concerning the PRZM input files, percent turfed watershed area (greens, tees, fairways) in about 40 golf courses ETS has dealt with professionally, and a national analysis of percent 8-digit HUC watershed area in golf courses.  Scott Jackson used Golf magazine database as well as the same database as ETS - both gave very similar data for percentage of 8-digit HUC consisting of golf courses.</p>

<p>Jim Carleton mentioned that ORNL watershed GIS analysis (contracted by EPA) of delineated watersheds for all SW CWS's that serve more than 25 people should provided land use/cover statistics for all NLCD categories, including golf courses, at a scale more directly relevant for drinking water.  Although not yet finished, this project is nearing completion.</p>

<p>Pat Havens commented on the NLCD approach and the degree of accuracy for turf classifications.  Changes in golf course development status, regional anomalies in turf classification, timing of imagery may lead to underestimates of turfed area.</p>

<h3>Rice modeling update (Jim Breithaupt)</h3>

<p>Jim B. gave an overview of EFED's conceptual model for rice (geometry, practices, fundamental assumptions).  No decision on how to include photolysis yet; this will not be as easy as it seems.  MS scenario on sharkey clay exemplified - irrigated from a large well, soya/rice considered, 40 acre field.  Rice fields are regarded as independent draining to a single point.  AR scenario (60 acre made up of three subfields that can be serially connected when the gates are opened) considered to have a 0.2 ft per 100 ft slope.  4 inch average depth of water; water has to be replenished frequently.  CA is a separate case.</p>

<p>Timing - scenario work is almost done - CA is underway and Jim is awaiting response on TX issues.  As far as the modeling is concerned, there may be something to present at September meeting; if not, by late 2002.  A decision on which model to use with these
scenarios has not been made. </p>

<h3>Intergovernmental Drinking Water Initiative (WARP) (Mah Shamim)</h3>

<p>Mah presented the current status of the WARP model (based on atrazine); further work will be needed to ascertain applicability for other classes of compound before it can be used for extrapolation for chemicals with no monitoring data available.  Will be used by agencies to assess DW issues for targeted populations and to identify watersheds of concern.  Monitoring study under way at 5 pilot sites for one year (PA, GA, OR, NC, ND) using USGS multi-residue methods (USGS are lead agency in field) that include 200 parent pesticides but may include metabolites.  Sediment is not included due to funding  concerns.  Phase 2 will focus on spatial and geographical variability (builds in different Ag practices) - maybe 20 sites but could be 30-40 sites.  Jim Cowles has left EPA, and Jim Carleton has taken over technical oversight of the Oak Ridge project for delineating watersheds.  Phase 2 may include some coverage of urban issues; may later include reservoirs.  Funding is still an issue.</p>

<p>To better understand use issues EFED are comparing CA DPR data with NCFAP to develop an understanding of uncertainties in the NCFAP use data - also looking at comparisons in a few other states.</p>

<h3>EFED Fate database (Rudi Pisigan Jr.)</h3>

<p>Rudi went through the purpose and elements of the EPA's developing database tool which is believed to have considerable potential for searching for compounds with certain combinations of parameters or to understand the range of properties of chemicals with known modes of action (and other comparative risk assessments).  Envisaging links between the database and models.</p>

<p>Will be publicly available - 250 Active ingredients included.  Once QA/QC
is complete, the database may be publicly available in October.</p>

<h3>PRZM -EXAMS Scenario Development (Sid Abel)</h3>

<p>New scenarios have been developed as well as guidance on how to develop a scenario.  Sid will provide electronic copy of this draft and the QA/QC procedures for circulation on list server (plus lists of weather stations).  Larry Burns is pressing to include the new scenarios in EXPRESS.</p>

<p>EFED now has 53 scenarios in the standard suite - 50 more scenarios are in Queue.  EFED policy says "do not use a scenario" until ratified.  Meanwhile Larry Burns
has been supplying revised weather files etc.  Most scenarios use benchmark soils (C's and D's); each has a full metadata file.</p>

<p>Current plans are to continue to develop scenarios, examine impact of SAMSON sites (a few sites have less than 36 years).  Currently available "ad hoc" (ideally QA/QC'd) - will be two formats, DOS and text file for the new GUI interface.  Will be distributed via web but needs a manual to explain how to be used.  Sid is amenable to a work group evaluating these new scenarios.</p>

<p>Might be more model runs per crop.</p>

<h3>Spray Drift Task FORCE model activities (Rama)</h3>

<p>Currently working on Multiple application interface cosine issue; a proposal has been submitted to Norm Birchfield.  Other issues include the potential for wingtip modifications to mitigate aerial drift, various attempts to generate a mechanistic ground spray model.</p>

<p>AgDrift model is still not directly available from the web site.</p>

<h3>Purpose of the EMWG (Betsy Behl)</h3>

<p>EFED sees this as a useful forum for discussion; there have been many changes in format over the last year or so.  We need to consider ourselves as "FACA like".</p>

<p>EFED is concerned that the speed and extent of input on certain issues has not been as good as it could be.  While everyone acknowledges the difficulties associated with resource constraints, EFED would like to see more proactive response.</p>

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

<h2 id="other">Other Important Business Matters, Suggestions, and Next Meeting Date</h2>

<p>The issue of how to build the impact of Spray drift Mitigation into the Index reservoir - Sid Abel explained there are hopes to build SDTF set back capability into PRZM-EXAMS Suite in the future.</p>

<p>Questions were raised about the EPA RRA risk assessment model introduced at SETAC Vienna; this might be discussed at the September meeting.</p>

<p>Next meeting to be at Crystal City, September 24<sup>th</sup>. </p>

<p>Nancy Ragsdale was thanked for hosting for the meeting and suggested that this could be repeated next year.</p>

<p><strong>PUBLIC MEETING OF EXPOSURE MODELING WORK GROUP<br />
September 24, 2002  (9:00-3:00)</strong><br />
<em>EPA EFED, Crystal Mall - details required </em></p>

<p><strong>Provisional Agenda</strong></p>

<ol>

<li><h3>Welcome and Introductions</h3></li>

<li><h3> Old Action Items</h3></li>

<li><h3>New developments Brief updates</h3> 

<h4>Model Status:</h4>

<p>PRZM/EXAMS Progress (Larry Burns/Mark Cheplick/Dirk Young)</p>

<p>SDTF progress (Rama)</p>

<p>RRA model development (Lin)</p>

<p>Rice Modeling (Breithaupt)</p>

<p>Plan for model numbering, verification, specifying current regulatory versions</p>

<p>Unified paln for dealing with new model weather sets/pan evaporation etc (see old actions)</p>

<h4>Others:</h4>

<p>FOCUS and related EU Activities (Russell/ Jones)</p>

<p>ARS activities (Hapeman/Wauchope)</p>

<p>Disseminate new EMWG Charter and organization (Behl/Henldey/Gilding)</p>

<p>Efate database - plans for QA/QC and release</p>

</li>

<li><h3>PRZM_EXAMS Scenarios - preliminary industry feedback</h3></li>

<li><h3>SCIGROW and PGW database prototype(Mike Barrett)</h3></li>

<li><h3>WARP and NAWQA - USGS progress and plans (C. Crawford)</h3></li>

<li><h3>EFED review of Watershed scale models (Mike Barrett)</h3></li>

<li><h3>Industry thoughts on Groundwater modeling</h3></li>

<li><h3>Other Important Business Matters</h3></li>

</ol>

<h3>Close (3 pm)</h3>

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