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<p>OPP Conference Room<br />
Crystal Mall Building 2<br />
Room 1126</p>

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

<ul>
<li><a href="#attendees">Attendees</a></li>
<li><a href="#status">Status of Old Action Items</a></li>
<li><a href="#introduction">Introduction</a></li>
<li><a href="#brief">Brief Updates</a></li>
<li><a href="#next">Next Meeting</a></li>
<li><a href="#actions">Actions</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>Dirk Young</td><td> 	OPP/EFED</td></tr>
<tr><td>Betsy Behl</td><td> 	OPP/EFED</td></tr>
<tr><td>William Eckel</td><td> 	OPP/EFED</td></tr>
<tr><td>Ron Parker</td><td> 	OPP/EFED</td></tr>
<tr><td>Mark Corbin</td><td>	OPP/EFED</td></tr>
<tr><td>Mohammed A. Ruhman</td><td>	OPP/EFED</td></tr>
<tr><td>Jim Lin</td><td>	OPP/EFED</td></tr>
<tr><td>R. David Jones</td><td>	OPP/EFED</td></tr>
<tr><td>Steve Bradbury</td><td>	OPP/EFED</td></tr>
<tr><td>Donna Randall</td><td>	OPP/EFED</td></tr>
<tr><td>James Hetrick</td><td>			OPP/EFED</td></tr>
<tr><td>Subijoy Dutta</td><td>			OPP/EFED</td></tr>
<tr><td>Lucy Shanaman</td><td>			OPP/EFED</td></tr>
<tr><td>Stephanie Syslo</td><td>			OPP/EFED</td></tr>
<tr><td>Jim Wolf</td><td>			OPP/EFED</td></tr>
<tr><td>Alex Clem	</td><td>		OPP/EFED</td></tr>
<tr><td>Dana Spatz</td><td>			OPP/EFED</td></tr>
<tr><td>Faruque Khan</td><td>			OPP/EFED</td></tr>
<tr><td>Thuy Nguyn</td><td>			OPP/EFED</td></tr>
<tr><td>Larry Liu</td><td>			OPP/EFED</td></tr>
<tr><td>Mah Shamim</td><td>			OPP/EFED</td></tr>
<tr><td>Larry Burns</td><td>			EPA ORD</td></tr>
<tr><td>Piyush Singh</td><td> 	DuPont</td></tr>
<tr><td>Mark Russell</td><td>	Dupont</td></tr>
<tr><td>Katherine Carr</td><td>	Monsanto</td></tr>
<tr><td>Mary Nett</td><td> 	WQC</td></tr>
<tr><td>Pat Havens</td><td> 	Dow</td></tr>
<tr><td>Russell Jones</td><td> 	Bayer</td></tr>
<tr><td>T. S. Ramanarayanan</td><td>	Bayer</td></tr>
<tr><td>Paul Hendley</td><td> 	Syngenta</td></tr>
<tr><td>Wenlin Chen</td><td>	Syngenta</td></tr>
<tr><td>Scott Jackson</td><td> 	BASF</td></tr>
<tr><td>Elise McCoy</td><td> 	FMC</td></tr>
<tr><td>Mark Cheplick</td><td> 	Waterborne Environmental</td></tr>
<tr><td>Amy Ritter</td><td>	Waterborne Environmental</td></tr>
<tr><td>Cathleen Hapeman</td><td>		USDA/ARS</td></tr>
<tr><td>Tamara Estes</td><td>			Stone Environmental</td></tr>
<tr><td>Michael Winchell</td><td>		Stone Environmental </td></tr>
<tr><td>Lajan Barnes</td><td>			Environmental and Turf Services</td></tr>
<tr><td>Qingli Ma	</td><td>		Environmental and Turf Services</td></tr>
<tr><td>Vince Piccirillo</td><td>			VJP Consulting</td></tr>
<tr><td>Kurt Rindfusz</td><td>			ERG</td></tr>
<tr><td>Young No</td><td>			Keller and Heckman</td></tr>
<tr><td>Rick Reiss</td><td>			Sciences international</td></tr>
<tr><td>Brent Solomon</td><td>			Valent</td></tr>
<tr><td>David Sullivan</td><td>			Sullivan Environmental</td></tr>
<tr><td>Benjamin Smallwood</td><td>		NRCS</td></tr>
</tbody>
</table>

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

<h2 id="status">Status of Old Action Items</h2>

<ul>
<li><p>Michael will schedule progress reports on the EFED research programs at the next EMWG meeting - <strong>cover in July</strong></p></li>
<li><p>EPA to put Gail's presentation (once rechecked by USGS) up on the website - <strong>DONE</strong></p></li>
<li><p>EFED will ideally add Tier 2 GW needs and conceptual model to the agenda for the January meeting - see below - <strong>will be covered</strong>  in July</p></li>
<li><p>Don will circulate an Excel spreadsheet of combined databases when available - aiming for the end of month  (Don will circulate an Excel spreadsheet of combined databases when available - aiming for the end of month  ) - <strong>PH to remind Don again</strong></p></li>
<li><p>Michael Barret still to circulate PGW database templates (last meeting) and, if appropriate, Michael will arrange for a discussion topic on this at the January EMWG - <strong>Jim to cover</strong></p></li>
<li><p>Ron Parker to update FIFRA EMWG on progress of the FAO comparative model at the next meeting - <strong>Cover in July</strong></p></li>
<li><p>A demonstration of the EFED database will be given if possible at the January meeting - <strong>to be given later today</strong></p></li>
<li><p>Michael Barrett to add a discussion of the details of the kinetics policy to the agenda of the first FIFRA EMWG after management has approved the draft as well as circulating the proposal itself. - <strong>ACTION: Betsy to progress with Efate Tech team</strong></p></li>
<li><p>EPA to review CARES and PLUS - add CARES as a standard topic for updates to future meetings - Beth is <strong>ISLI is now the conduit for the model - Jim to invite Beth to report back on CARES progress at a future meeting</strong></p></li>
<li><p>Larry Burns to provide a summary of recent changes and version numbers and the system to access older versions. <strong>Larry Burns received a list of key versions from EFED and has prepared a web accessible set of programs and release notes for EXAMS and PRZM (3.12.1 and 3.12. Beta - back to Feb 1998 - recompiled to work under XP) and will go back further [versions 1.0 - 2.3, 3.0] (already on CEAM site)</strong>.</p></li>
<li><p>There will be a presentation on USGS GW model evaluation program at the next EMWG meeting - <strong>Jack Barbash will make a presentation in July (see Jan 2004 minutes)</strong></p></li>
<li><p>EXPRESS Coding issue to be resolved if possible so that the industry review of EXPRESS can be completed - <strong>see update</strong></p></li>
<li><p>EFED review of PRZM-EXAMS scenarios to be discussed - <strong>later today</strong></p></li>
<li><p>EFED to provide information on new PCA policy for minor crops as soon as feasible - presentation available on Web site</p></li>
<li><p>Mark Cheplick, Tammara Estes and Ron Parker to resolve issue of reported truncation bug in EXPRESS and report via list server. - <strong>under way</strong></p></li>

</ul>

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

<h2 id="introduction">Introduction</h2>

<p>Jim Lin introduced the meeting and reviewed actions as shown above</p>

<p>As a reminder the FIFRA EMWG web site can be found at 
<a href="http://www.epa.gov/oppefed1/models/water/emwg_top.htm">http://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="brief">Brief Updates</h2>

<p><strong>PRZM-EXAMS model/ EXPRESS</strong></p>

<p>Larry reported on the versioning and is looking at volatilization and furrow irrigation routines.  He is examining EXPRESS performance issues and is looking at ways to improve speed of transfer.  Manual is available - comments will be available by April 9.  Then will need to QA PRZM in situ - completion of EXPRESS for general use needs to be discussed with management. ORD will follow up once internal EFED QA.  <strong>ACTION</strong>: Industry will hold review until EFED release the manual.  Issue of inclusion of volatilization was discussed  - the current scenarios do not have the necessary sand, silt and clay information (this is a scenario issue).  <strong>ACTION</strong>: Agreed that the volatilization feature should be turned on but an internal decision on whether to use a constant soil temperature should be adopted and reported at the next EMWG.</p>

<p><strong>Standard Scenarios</strong></p>

<p>Ron reported that there is a three-person group that is reviewing the public comment - three major responses under way. </p>

<ol style="list-style-type:upper-alpha">
<li><p>Original authors are checking detailed comments on scenarios - 90% complete</p></li>
<li><p>Specific OP scenarios targeted at particular uses/sites and these are being separated out and will only be used on a case by case basis</p></li>
<li><p>EFED is discussing options for further stakeholder input on scenarios.</p></li>
</ol>

<p>New scenarios are becoming available - clarification will be made soon.  </p>
	
<p><strong>Groundwater</strong></p>

<p>Betsy Behl reported that OPP, USGS (Jack Barbash et al) and others are working together to evaluate seven models, HYDRUS 2D, PRZM, LeachM,  LeachP, RZWQM98, GLEAMS, BS2D being run with data from two PGW sites and several NAWQA sites.  This group will report back on progress to EMWG next time.  Differences are being seen but no information available presently - Mark Corbin and Jim Wolfe driving this and PMRA involved.  Also work to look at FEMVTF documentation and other literature. <strong>ACTION</strong>: Jack Barbash will attend the next meeting to discuss preliminary findings</p>

<p><strong>Scientist to Scientist Drinking Water treatment Workshop</strong></p>

<p>AWWA and many others attended this meeting and a disk with all presentation is available - <strong>ACTION</strong>: Jim Lin will put the presentations from the DW treatment workshop on the EMWG website. </p>

<p><strong>ACS Soil Dissipation Meeting ACS Anaheim 2004-01-06</strong></p>

<p>Mark Corbin reported back on this useful meeting that focussed on technical data, conceptual model - <strong>ACTION</strong> : PH to feed back the collection of presentations from the ACS TFSD meeting to Mark Corbin for inclusion on the web site</p>

<p><strong>European Efforts</strong></p>

<p>A second FOCUS Groundwater group has just started meeting.  FOCUS kinetics has one more meeting left and the original landscape and mitigation group is finalizing their report.  A second FOCUS landscape and mitigation group will start in 2005. <strong>ACTION</strong>: Russell Jones to mention EPA availability to attend Landscape and Mitigation 2 group (starts 2005) at upcoming EEASG meeting in Europe to formally obtain an invitation.</p>

<p><strong>Summary of the Fumigant Emission Modeling System (FEMS) - Dave Sullivan</strong></p>

<p>Covered chemigation, center-pivot irrigation and shank injection uses of metam-sodium.  Many problems as there are very infrequent use and the exposure is highly variable due to diurnal variation as well as infrequent use.  Sealing practices are important to mitigate problems - especially if we can keep peaks away from the night-time.  Probabilistic approaches work well here.  Key monitoring /modeling link for verification/validation/ground truthing is with ambient monitoring across 4 days using a 4 or 6 hour sampling period. {Note: Metam-sodium could be monitored via remote concentration sensing in real time - slice in 3D}</p>

<p>Data Log normally distributed, fitted to a cubic fit - modeled at 1.5 m.  FEMS model addresses Application rate/method, acres applied and field shape, up to six endpoint concentrations, selected probabilistic variables, meteorological region, # simulated years.  EPA and industry will be meeting shortly to discuss common protocols.</p>

<p><em>Questions</em>:</p>

<ol>
<li><p> How much field work would be needed to capture this deterministically??  Approach was to capture the worst case (Bakersfield) and then (money and time permitting) move to heavy soils.  However, capturing variable wind will be tough to cover</p></li>
<li><p> What was model averaging time?  4 hours but FEMS can produce hourly outputs.</p></li>
<li><p>How does sealing work?  Need to have a good water moisture level initially.  Critical to keep it moist or even to compact the soil - needs to select form a toolbox of options.</p></li>
</ol>

<p><strong>PRZM with new Subroutine of Adsorption /Desorption Kinetics - Wenlin Chen</strong></p>

<p>Wenlin described the rapid and slow phases of adsorption kinetics that mirror the biphasic degradation often seen in metabolism studies.  This could be due to microbial incapacitation OR to increasing binding (decreasing releasibility).  He showed the conceptual model for a variable rate desorption system and an associated analytical solution.  From Jury, Wagenet, Chen publications.</p>

<p>Using a set of examples with degradation operating in aqueous only or aqueous plus solid phase he led to the solution adopted for implementing the approach in PRZM.  This solution uses an adsorption/desorption constant, fraction on the equilibrium sorption site, degradation rate constant for soil pore water and on solid phase where needed.</p>

<p>The new program fits well with various data sets.  This revised code is available from WEI for experimentation</p>

<p>Points to consider include</p>

<ol style="list-style-type:lower-alpha">
<li><p>Need for more validation</p></li>
<li><p> How to deal with generalizing rate constants since the kinetics will be soil specific.  Otherwise may be somewhat site specific</p></li>
<li><p> Correlate sorption rate constant with Koc</p></li>
<li><p> Site specific investigation</p></li>
<li><p> Use of paired Kd and half lives for exposure assessments</p></li>
</ol>

<p>Evidence for a single chemical (with soil pH dependency) was provided linking soil bulk degradation with non-kinetic Koc values showing a simple relationship.  The impact of the value of paired Kd and half lives was shown in an example where the used of lowest Kd and longest half life greatly over-predicted leaching but the use of paired values helped greatly.</p>

<p>Wenlin suggested some reasons why some compound (classes) might exhibit paired Koc and half life and some might not. </p>

<p><em>Questions</em>:</p>

<ol>
<li><p> What impact will this have on runoff??  May increase runoff (at least in erosion component)</p></li>
<li><p> How is chemical added?  Via soil solution and equilibrium sorption portions. </p></li>
<li><p>Example suggested a cropped plot and bare plot that gave similar results - why?  Mark Cheplick suggested that this was a PRZM feature and Wenlin responded that he did not run the data sets for the cropped and bare plots </p></li>
<li><p> How does this differ from PEARL routine??  There is degradation in the soil fraction of the kinetic portion.</p></li>
<li><p> In 0-6 in calibration example, why not just increase the KD?  This will delay the peak.  This strongly reflects recent literature</p></li>
<li><p> Is conceptual model over-specified?? After discussion agreed that it would be worth looking at the potential for simplification.</p></li>
<li><p> How do you get a decent estimate of the long term Kd??  We need a longer study.  All agreed.</p></li>
<li><p> Correlation of half life should be with long term DESORPTION rate.  Needs caution to avoid artificial data.  Need to keep the different approaches separate</p></li>
<li><p> This means we really need to get complementary datasets for the same soil in lab, field and adsorption studies.</p></li>
</ol>

<p><strong>ACTION</strong>: All to try to download the revised the PRZM model and try it out with their own datasets. Discuss at July Meeting</p>

<p><strong>Feedback from the Probabilistic SAP meeting - Steve Bradbury, Donna Randall and Dirk Young</strong></p>

<p>New material including the PowerPoint slides used at the SAP will be available soon from the Web site. <strong>ACTION</strong>: All to download and read relevant material</p>

<p>Steve relayed that a key issue in both terrestrial and aquatic areas lead from the conceptual model and could be broadly summarized as "what exposure estimation refinements belong at Tier 2 and at Tier 3".  Key issues were the readily availability of data (essential for Tier 2), addition of complexity to models (should be minimal), etc</p>

<p>SAP members raised the issues of improved mathematical approaches and do more convenient sensitivity analyses.  SAP felt the need for workshops and alpha and beta testing and how to disseminate instructions for the approach.</p>

<p>Another key topic is validation, evaluating, ground truthing and confidence building and what sort of empirical data could help achieve these goals.  This philosophical thinking helped greatly and indicates that very careful specifications are needed.</p>

<p>Next steps were also discussed.  Based on data that is submitted by registrants we are presently reaching the limits of Tier 2.  Therefore, a key question is how the academic and government research communities can help meet key longer term goals (e.g. USGS, EPA ORD, USDA, ARS).  For example, distribution of receiving water bodies by region. </p>

<p>Aquatic group focussed purely on exposure assessment.  </p>

<p><em>Questions</em>:</p>

<ol style="list-style-type:lower-alpha">
<li><p>Seems like a one-way process??  Why can't the process be done more openly and involve panel types earlier??  History is SAP driver from 1996 via ARAMDG to ECOFRAM and external peer review.  Then EPA took this report and ran with it with occasional check in with SAP.  This is where EFED is at now.  However, in addition, things like development and testing of techniques and models will involve the whole scientific community.  This will be even more important with the Tier 3 PRA - where open research processes are essential.</p></li>
<li><p>Need to educate the risk managers on how to deal with Probabilistic risk assessment output? In some cases deterministic methods may be good enough but in others the Problem Formulation will show us that PRA is the technique needed.  Key issues are the need to do "good enough" assessments to address needs.  Education is needed on all aspects of risk assessment and effective action as the concepts evolve. </p></li>
<li><p>Will we see an analysis of the historical guidelines, conceptual models and approaches and protection goals and pull together a unified EFED approach</p></li>
<li><p> Current tier 2 aquatic risk assessment IS probabilistic but we have only been using a single point.?    </p></li>
<li><p>Did the presentation on the CA water bodies reflect the scenario specific modeling?  No there may have been some confusion here.</p></li>
<li><p>Need to be very specific in the PF on what biology and water body types need to be protected - different  </p></li>
<li><p>What next?  Get panel report back.  Assumed no show stoppers - will then move to sensitivity analyses and revised models for alpha and beta testing and training etc.  May be a meeting with SAP sooner rather than later on next steps and links to ORD/OPP research goals.  There may currently be a mismatch between exposure efforts and aquatic effects side and what pathways are most sensible to follow for EFED and research partners.</p></li>
<li><p>EXAMS has variable volume components - should we expose this to user community? Yes. The code in the EXAMS model will be made available.</p></li>
</ol>

<p><strong>Introduction and Demonstration of EFED's Pesticide Database - Mah Shamim and Larry Liu</strong></p>

<p>Mah provided an update on progress on the database that is nearly ready for public release on the Web - will be announced on the list when available.  There will be a mechanism put in place to handle comments and corrections.  Now in Oracle and currently limited to 188 compounds registered pesticides with data that has been reviewed by EFED and/or AD and is viewed as sound.  The entries have been QA/QC'd.  Some product chemistry and field dissipation data remains to be added to fill in the data gaps.  Focus has been to get the interface optimized.  Will re-evaluate the file room to find other chemicals that are not included.  The data will be the half lives reported in the DER.  Units are not yet expressed in SI units.  Exportable into Excel.</p>

<p>Basically the whole gamut of useful data is included.  About 200 more actives may need to be added.</p>

<p>Questions asked by NRCS regarding the processing of the data - the database does not include any manipulated information.  Larry Liu showed examples of queries. The question was asked as to how the public can get information that links the active ingredient with the associated trade names. </p>

<p><strong>ACTION</strong>: Kathleen Hapeman will send new address of ARS database that will continue to be maintained presently - Done 
<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>
<a href="http://www.arsusda.gov/acsl/services/ppdb">http://www.arsusda.gov/acsl/services/ppdb</a> </p>

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<h2 id="next">Next Meeting</h2>

<p>Next meeting options include July 13 or 14 or following week.  Jim Lin will send around a voting email and then circulate the final date ASAP.</p>

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<h2 id="actions">ACTIONS</h2>

<p><strong>Old Items Carried through</strong></p>

<ul>

<li><p>Michael will schedule progress reports on the EFED research programs at the next EMWG meeting - <strong>cover in July</strong></p></li>
<li><p>Don will circulate an Excel spreadsheet of combined databases when available - aiming for the end of month  (Don will circulate an Excel spreadsheet of combined databases when available - aiming for the end of month  ) - <strong>PH to remind Don again - Done</strong></p></li>
<li><p>Michael Barret still to circulate PGW database templates and, if appropriate, Michael will arrange for a discussion topic on this at the January EMWG - <strong>Jim to cover for July</strong></p></li>
<li><p>Ron Parker to update FIFRA EMWG on progress of the FAO comparative model at the next meeting - <strong>Cover in July</strong></p></li>
<li><p>Michael Barrett to add a discussion of the details of the kinetics policy to the agenda of the first FIFRA EMWG after management has approved the draft as well as circulating the proposal itself. - <strong>ACTION: Betsy to progress with Efate Tech team</strong></p></li>
<li><p>EPA to review CARES and PLUS - add CARES as a standard topic for updates to future meetings - <strong>Beth is ISLI is now the conduit for the model - ACTION: Jim to invite Beth to report back on CARES progress at a future meeting</strong></p></li>
<li><p>There will be a presentation on USGS GW model evaluation program at the next EMWG meeting, this will link with the old action item on Tier 2 GW needs and conceptual model  - <strong>Jack Barbash will make a presentation in July (see Jan 2004 minutes)</strong></p></li>
</ul>

<p><strong>New Items</strong></p>

<ol>

<li><p>Industry will hold review of EXPRESS until EFED release the manual and report that key aspects of the final ORD revisions to the code are fixed</p></li>
<li><p>ORD and EFED to agree whether the volatilization feature should be turned on in PRZM/EXPRESS and EFED to make an internal decision on whether to use a constant soil temperature.  Decision to be communicated over list server or via reporting at the next EMWG.</p></li>
<li><p>Jim Lin will put the presentations from the DW treatment workshop on the EMWG website.</p></li>
<li><p>PH to feed back the collection of presentations from the ACS TFSD meeting to Mark Corbin for inclusion on the web site</p></li>
<li><p>Russell Jones to mention EPA availability to attend Landscape and Mitigation 2 group (starts 2005) at upcoming EEASG meeting in Europe to formally obtain an invitation.</p></li>
<li><p>All to try to download the revised PRZM model and try it out with their own datasets. Discuss at July Meeting</p></li>
<li><p>All to download and read relevant PowerPoint slides from Probabilistic SAP</p></li>
<li><p>Jim Lin will confirm date and place of next meeting</p></li>
</ol>

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