Document ID: EPA-HQ-OPP-2002-0334-0009
Agency: epa
Document Type: Supporting & Related Material
Title: 
Posted Date: 2007-09-20T04:00Z

<!DOCTYPE html
     PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
     "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<!-- EPA Template version 3.2.1, 28 June 2006 -->
<head>
	<!-- #BeginEditable "doctitle" -->
	<title>Minutes of the June 10, 2003 Exposure Modeling Public Meeting | Pesticides | US EPA</title>
	<meta name="DC.description" content="pesticide, pesticides,Access to and information regarding simulation models to predict pesticide concentrations in surface and ground water for use in both human health and aquatic ecological exposure assessments.  Exposure modeling public meeting products." />
	<meta name="keywords" content="EPA,Environmental Protection Agency, OPP, pesticides, pesticide, office of pesticide programs, scigrow, geneec, first, water models, exposure modeling public meeting" />
  <!-- #EndEditable -->
	<!-- #BeginEditable "metaElements" -->
	<meta name="DC.title" content="Minutes of the June 10, 2003 Exposure Modeling Public Meeting | Pesticides | US EPA" />
	<meta name="DC.subject" content="EPA,Environmental Protection Agency, OPP, pesticides, pesticide, office of pesticide programs, scigrow, geneec, first, water models, exposure modeling public meeting" />
	<meta name="DC.type" content="" />
	<!-- For date metadata, use the format YYYY-MM-DD -->
	<meta name="DC.date.modified" content="2007-06-18" />
	<meta name="DC.date.created" content="" />
	<meta name="DC.date.reviewed" content="" />
  <!-- #EndEditable -->

	<meta name="DC.language" content="en" />
	<meta name="DC.Creator" content="US EPA, Office of Pesticide Programs" />
	<meta http-equiv="Content-Style-Type" content="text/css" />
	<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
	<link rel="schema.DC" href="http://purl.org/dc/elements/1.1/" />
	<link rel="meta" href="http://www.epa.gov/labels.rdf" type="application/rdf+xml" title="ICRA labels" />
	
	<style type="text/css" media="screen">@import 'http://www.epa.gov/epafiles/s/epa.css';</style>
	<style type="text/css" media="screen">@import 'http://www.epa.gov/opp00001/styles/opp_styles.css';</style>
	<!--[if lt IE 7]>
	<link rel="stylesheet" type="text/css" href="http://www.epa.gov/epafiles/s/ie.css" />
	<link rel="stylesheet" type="text/css" href="http://www.epa.gov/opp00001/styles/opp_ie_styles.css" />
<![endif]-->
	<link rel="stylesheet" type="text/css" media="print" href="http://www.epa.gov/epafiles/s/print.css" />
	<script type="text/javascript" src="http://www.epa.gov/epafiles/js/epa-core.js"></script>
	<script type="text/javascript" src="http://www.epa.gov/epafiles/js/extra.js"></script>
</head> 

<body>
<p class="skip"><a id="skiptop" href="#content" title="Jump to main content.">Jump to main content.</a></p>

<div id="header"> <!-- START EPA HEADER -->

	<div id="logo"><a href="http://www.epa.gov/" title="US EPA home page"><img src="http://www.epa.gov/epafiles/images/logo_epaseal.gif" alt="[logo] US EPA" width="100" height="110" /></a></div>

	<div id="areaname"> <!-- START AREA NAME -->
		<p><span class="epaAreaName">Pesticides: Science and Policy </span></p>
  </div> <!-- END AREA NAME -->

	<!-- START SEARCH CONTROLS -->
	<form id="EPAsearch" method="get" action="http://nlquery.epa.gov/epasearch/epasearch">
		<!-- START AREA SPECIFIC LINKS AND SEARCH BOX  -->
		<!-- CHANGE links to point to your own recent additions and contact pages -->
		<!-- REMOVE recent additions link if your area doesn't have one -->
		<p><a href="http://cfpub.epa.gov/pesticides/recentadditions.cfm">Recent Additions</a> | <a href="http://www.epa.gov/pesticides/regulating/contacts.htm">Contact Us</a> 
			<span class="search"><strong>Search:</strong> 
			<input type="hidden" name="fld" value="gov/pesticides/science,oppfead1/trac/science,oppfead1/carat,oppfead1/cb/ppdc/,gov/scipoly/sap,oppad001,pesticides/antimicrobials,oppbppd1/biopesticides/regtools/guidelines,oppbead1/methods,oppbead1/labs,oppefed1/models,opptsfrs/home,gov/scipoly/oscpendo,gov/PR_Notices" />
			<input type="hidden" name="areaname" value="Pesticides: Science and Policy" />
			<input type="hidden" name="areacontacts" value="http://www.epa.gov/pesticides/science/contacts.htm" />
			<!-- AREA ADVANCED SEARCH URL HERE (OPTIONAL) -->
			<input type="hidden" name="areasearchurl" value="http://www.epa.gov/pesticides/search.htm" />
			<!-- THE REMAINING HIDDEN INPUTS ARE USED BY THE SEARCH ENGINE - DO NOT EDIT -->
			<input type="hidden" name="result_template" value="epafiles_default.xsl" />
 			<input type="hidden" name="filter" value="sample2filt.hts" />
			<input name="typeofsearch" id="EPAall" type="radio" value="epa"/><label for="EPAall">All EPA</label> 
			<input name="typeofsearch" id="Areaall" type="radio" value="area" checked="checked" /><label for="Areaall">This Area</label> 
			<input name="querytext" id="searchbox" value="" /> 
		  <input name="submit" id="searchbutton" type="submit" value="Go" /></span>
	  </p>
	</form> <!-- END SEARCH CONTROLS -->
		
	<ul> <!-- BEGIN BREADCRUMBS -->
		<li class="first">You are here: <a href="http://www.epa.gov/">EPA Home</a></li>
		<li><a href="http://www.epa.gov/pesticides/index.htm">Pesticides</a></li>		
		<!-- START AREA BREADCRUMBS -->
		<!-- #BeginEditable "breadcrumbs" -->		
		<li><a href="http://www.epa.gov/pesticides/science/index.htm">Science & Policy</a></li>
		<li><a href="http://www.epa.gov/pesticides/science/models_db.htm">Models 
            and Databases</a> </li>
		<li><a href="http://www.epa.gov/oppefed1/models/water/index.htm">Water Models		</a></li>
		<li><a href="http://www.epa.gov/oppefed1/models/water/emwg_top.htm">Exposure 		Modeling Public Meeting (EMPM) Information and Products</a></li>
		<li>Minutes of the June 10, 2003 Exposure Modeling Public Meeting</li>
    <!-- #EndEditable -->
		<!-- END AREA BREADCRUMBS -->
	</ul> <!-- END BREADCRUMBS -->

</div> <!-- END EPA HEADER -->

<hr class="skip" />

<p class="skip"><a id="pagecontents"></a><a id="pagetop"></a></p>
<div id="content"> <!-- BEGIN PAGE CONTENTS -->	<!-- EPA SITE-WIDE ANNOUNCEMENTS -->
	<!-- DO NOT REMOVE - this code is used for emergency messages -->
<!-- If this page is a Program Office or a Topics home page, CHANGE "sitewidec" TO "sitewideb" -->
	<p id="sitewidec"></p>

	<!-- BEGIN PAGE NAME -->
	<h1><!-- #BeginEditable "PageName" -->Minutes of the June 10, 2003 Exposure Modeling Public Meeting<!-- #EndEditable --></h1>
	<!-- END PAGE NAME -->

			<!-- BEGIN CONTENT AREA -->

			<!-- #BeginEditable "content" -->

<p>CM2<br />
Rm 1126<br />
1921 Jeff. Davis Hwy.<br />
Arlington, VA</p>

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

<ul>
<li><a href="#attendees">Attendees</a></li>
<li><a href="#welcome">Welcome and Introduction</a></li>
<li><a href="#action">Old Action Items</a></li>
<li><a href="#brief">Brief Updates</a></li>
<li><a href="#major">Major Topic Presentations</a></li>
<li><a href="#summary">Summary of New Action 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>Michael Barrett </td><td>OPP/EFED</td></tr>
<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>Alex Clem 	</td><td>OPP/EFED</td></tr>
<tr><td>Mark Corbin	</td><td>OPP/EFED</td></tr>
<tr><td>Jim Lin 		</td><td>OPP/EFED</td></tr>
<tr><td>Lucy Shanaman	</td><td>OPP/EFED</td></tr>
<tr><td>Jerry Hannan	</td><td>OPP/EFED</td></tr>
<tr><td>Kevin Costello	</td><td>OPP/EFED</td></tr>
<tr><td>Faruque Khan	</td><td>OPP/EFED</td></tr>
<tr><td>Thuy Nguyen	</td><td>OPP/EFED</td></tr>
<tr><td>Stephanie Syslo	</td><td>OPP/EFED</td></tr>
<tr><td>Subijoy Dutta	</td><td>OPP/EFED</td></tr>
<tr><td>Gerry Laniak	</td><td>National Exposure Research Lab. (NERL)/ EPA-ORD-Athens</td></tr>
<tr><td>Jim Carleton	</td><td>OPP/EFED</td></tr>
<tr><td>Nelson Thurman	</td><td>OPP/EFED</td></tr>
<tr><td>Piyush Singh	</td><td>DuPont</td></tr>
<tr><td>Sally Leva	</td><td>DuPont</td></tr>
<tr><td>Neil Shah		</td><td>Inside washington  publishers</td></tr>
<tr><td>Mary Nett 	</td><td>WQC</td></tr>
<tr><td>Nancy Ragsdale 	</td><td>USDA/ARS</td></tr>
<tr><td>Don Wauchope	</td><td>USDA/ARS</td></tr>
<tr><td>Russell Jones 	</td><td>Bayer</td></tr>
<tr><td>Wenlin Chen 	</td><td>Syngenta</td></tr>
<tr><td>Paul Hendley 	</td><td>Syngenta</td></tr>
<tr><td>T.S. Ramanarayan  </td><td>Bayer</td></tr>
<tr><td>Scott Jackson 	</td><td>BASF</td></tr>
<tr><td>Clauide Beigel	</td><td>BASF</td></tr>
<tr><td>Elise McCoy 	</td><td>FMC</td></tr>
<tr><td>Uwe Wanner 	</td><td>Crompton</td></tr>
<tr><td>Louis Suarez 	</td><td>NERL/Athens</td></tr>
<tr><td>Larry Burns	</td><td>NERL/Athens</td></tr>
<tr><td>Mark Cheplick 	</td><td>Waterborne</td></tr>
<tr><td>Andrew Hewitt	</td><td>Stewart Ag/SDTF</td></tr>
<tr><td>Andy Newcombe	</td><td>Levine-Fricke</td></tr>
<tr><td>Amanda Harrah	</td><td>Toxcel LLC</td></tr>
<tr><td>Dave Valcore	</td><td>DowAgro</td></tr>
</tbody>
</table>

<p><em>Note:  OPP/EFED = Office of Pesticide Programs, Environmental Fate & Effects Division</em></p>

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

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

<p>Michael Barrrett welcomed the attendees and introduced the speakers</p>

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

<h2 id="action">Old action items</h2>

<ul>

<li><p>Mary Nett to send protocol details to Michael Barrett who will post on the list server for further debate and comment.-  still needs to be put on the web</p></li>

<li><p>Don Wauchope to send his presentation on the USDA/ARS OPP/EFED workshop (focus
on developing credible mitigation measures) ASAP - Done</p></li>

<li><p>Mark Cheplick to post details of code changes in PRZM on this and slides showing impact of changes on the list server. - Not done yet.</p></li>

<li><p>EFED will complete QA for PE3.pl and PE4.pl and post on Web site - In progress.</p></li>

<li><p>Norm Birchfield will respond to revised language proposed by SDTF. This will also be an agenda item at the next meeting - Both done.</p></li>

<li><p>All are asked to review this version of EXAMINER before next meeting. - EXAMINER is available with EXPRESS.</p></li>

<li><p>The developers want review from the regulatory community on the alpha version of PLUS and decide if it is a worthwhile project for further development. The EFED Water Quality Tech Team will work with Scott Jackson to arrange a presentation at EPA to facilitate further discussion and review. - Both done.</p></li>

<li><p>Michael Barrett to send sample templates to registrants and post report update on the Web.- see below - To be done soon.</p></li>

<li><p>Mark Carroll to send his overheads to Mike Barrett for posting on the list server - Done.</p></li>

</ul>

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

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

<h3>European Union Modeling Activities (Russell Jones)</h3>

<p>Russell Jones covered the progress of the FOCUS kinetics, Landscape and mitigation and air residues issues - work is ongoing.  There was interest in the goals of the Landscape and mitigation team and Russell Jones pointed out that probably this group will really be a first step.  </p>

<p><strong><em>ACTION</em></strong>: Add to minutes a reference to Piacenza journal with details of the conference proceedings. Here it is:  </p>

<p>A. A. M. Del Re, E. Capri, L Padovani, M. Trevisan (eds).<em>  Pesticide in Air, Plant, Soil & Water System:  Proceedings of the XII Symposium Pesticide Chemistry</em>, June 4-6, 2003 Piacenza Italia.  La Goliardica Pavese..</p>

<p>Rama mentioned the impending <em>birth</em> of EUFRAM and the involvement of Donna Randall from EFED.  The purpose of this European group is to follow up on dealing with the issues generated by probabilistic approaches to risk assessment.</p>

<h3>USDA/ARS pesticide properties database (Don Wauchope)</h3>

<p>Don Wauchope has got together with NRCS Soil/Pesticide Interaction Screening Procedure
(SPISP) database (from Joe Bagdon; SPISP is the first tier in the Natural Resources Conservation Service's method for assessing water quality related pesticide risks) and USDA-ARS and is combining the two databases.</p>

<p>The SPISP database only has currently registered compounds - the ARS database has many older compounds.  Don Wauchope says the ARS database will continue to use the "selected values" approach which relies on best scientific judgment / intuition to select the most representative values for a pesticide.  He noted that no matter what method is used, there will always be questions on how data was selected.  The new database is being aimed at an WHO need for third world countries (presumably for human risk assessment results).</p>

<p>SPISP is based on GUS ratio (Reference: Gustafson, D.I. 1989. Groundwater Ubiquity Score: A simple method for assessing pesticide leachability. Environmental Toxicology and Chemistry.  Volume 8, pp. 339-357.) and runs with the USDA model GLEAMS.  The SPISP project needs to make the calculations available.  Don Wauchope will be getting the details of the SPISP calculations so he can calculate for some of the compounds without this data.  The database will be available via the Tifton web site.</p>

<p><strong><em>ACTION</em></strong> - Don will circulate an Excel spreadsheet when available - aiming for the end of August.</p>

<p>Comments on USDA and EPA pesticide fate properties databases:</p>

<p>This ARS database will be parallel with the EPA database process.  The latter is scheduled for fall/early winter for internal use and will not be publicly available till later.  The EPA database is currently solely based on submitted data.</p>

<p><strong><em>ACTION</em></strong> - May add a progress update on the EPA fate database to the September agenda.</p>

<h3>PRZM/EXAMS model (Luis Suarez)</h3>

<p>A fix has apparently been completed for the temperature version in PRZM; All the necessary paperwork to release version 3.125 official is in place.  The only other real difference from he one most people have will be that this is NOT a beta.</p>

<p>The same temperature bug was NOT present in 3.21 version. </p>

<h3>Rice Modeling (Jim Breithaupt)</h3>

<p>This project has been approved for Tier 1 implementation and Dave Jones is currently working on it.  It will include first order decay and sorption in a way analogous to GENEEC.  There will be no receiving water body.  Currently  the values calculated in EFED's REDs (reregistration eligibility documents) are done by an "interim model" that is more conservative than the final Tier 1 model will be.</p>

<p><strong><em>ACTION</em></strong> - Dave Jones and Jim Breithaupt will update on the status of development of the rice exposure modeling tools at the next meeting</p>

<h3>WARP model (Ron Parker)</h3>

<p>Not too much to report this time.  Regular team phone conferences will restart soon. The pesticide watershed usage group has made a lot of progress.  Difficulties with delineation of the watersheds is holding up progress on evaluating drinking water exposure. Watershed area is one of the key variables in WARP. The QA/QC process is formidable because ultimately it must be approached almost on a site-by-site basis. At least three states have generated their own boundaries. One option would be to compare our boundaries with those developed by these states. USGS are about to release a national coverage of  Dunne overland flow values. It will be distributed as soon as it is complete and checked. Once the watershed boundary data are available, will have both the atrazine and the multi-chemical models to use.  Project timing is now dependent on the plan for delineation of the watershed. </p>

<p><strong><em>ACTION</em></strong> - Ron Parker will check on potential availability of watershed data and provide feedback over the listserver.  There is a homeland Security issue for release of watershed delineation information, this is an issue being handled by the Office of Water. Some industry EMWG members indicated that they would still like to look at a spreadsheet of Community Water System characteristics even if the actual locations cannot be revealed.</p>

<p><strong><em>ACTION</em></strong> - It would be possible to present approaches for develop estimates of daily values at the next meeting. There are two approaches for adding daily values to the WARP percentiles and one for filling in daily values between monitored values. </p>

<p><strong><em>ACTION</em></strong> - Michael Barrett to add to agenda for next time (and invite Charlie Crawford and other appropriate speakers for these topics)</p>

<h3>Spray Drift Task Force progress (Paul Hendley) and AgDrift EPA Review (Norm Birchfield is out on paternity leave)</h3>

<p>Paul presented a review of SDTF progress towards trying to release the AgDRIFT® model.</p>

<p>Several options exist; the SDTF technical group has recommended making the whole thing
available.  Norm Birchfield has responded for EFED to the SDTF suggesting a way that might help them feel more inclined to open access to AgDRIFT® - SDTF is pleased with Norm' suggestion.  </p>

<p>An SDTF meeting tomorrow will decide from several options and try to change bylaws to
simplify release of the model.  The key point is that there is a terminology difference between Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA; i.e., OPP) risk assessment and AgDRIFT® Tiering structures.  AgDRIFT® tier 1 encompasses OPP tier 1 and 2.  To cover OPP Tier 3, only the MAA module needs to be added from AgDRIFT® tier 2.  The rest of AgDRIFT® Tier 3 covers very sophisticated Ag engineering issues that are probably too complex for current risk mitigation options.</p>

<p><strong><em>ACTION</em></strong> - Paul Hendley will circulate the outcome of the SDTF meeting on June 11 via the list server.</p>

<h3>EXAMINER (Mark Cheplick)</h3>

<p>EXAMINER has been attached to the latest version of EXPRESS but can be run independently or as part of EXPRESS.</p>

<p><strong><em>ACTION</em></strong> - Ron will hand out copies of EXPRESS instructions later and all will evaluate.</p>

<p><strong><em>ACTION</em></strong> - The instructions for accessing EXPRESS should be made available and a note sent around on the list server on access. (<em>Note: EPA may not be able to put information on website because EXPRESS is not at the current time an approved regulatory model / tool for OPP - a formal QA / QC process would be needed before this can happen.</em>)</p>

<h3>EXPRESS Shell Update (Ron Parker)</h3>

<p>EFED will be developing an implementation plan for EXPRESS.  ORD will be doing the
hardware QA/QC.  EPA will evaluate the QA/QC performance against the scenarios - comparing shell versus stand alone model runs.</p>

<p>The CURRENT POLICY is to run evaluations using PE4.pl which has been QA/QC'd.  After
EXPRESS has been QA/QC'd, this policy will probably change.  At that point the tier 2 shell may replace GENEEC</p>

<p><strong><em>ACTION</em></strong> - EFED to check why PE4.pl has not yet been made available on the website.</p>

<h3>PLUS (Scott Jackson)</h3>

<p>A presentation was made at OPP, this was a very well attended meeting.  Mark has recently fixed several of the known bugs.  He has added a revised aquifer code that apparently incorporates comments from the EPA.  EFED scientists are reviewing t he FIFRA Environmental Modeling Validation Taskforce (FEMVTF) papers - only two of the full set are key - the literature review (Russell Jones) and the results from leaching simulations (Mark Russell).  EFED scientists are examining what would be desired in a conceptual model for Tier 2 GW exposure model for risk assessment.  </p>

<p><strong><em>ACTION</em></strong> - EFED will add an agenda item to discuss Tier 2 GW needs and conceptual model to September meeting.  </p>

<p>It was suggested that it would be useful to have a presentation of the soils types/setting where PRZM seems to work better and why (and whether there are any other viable alternative models for the other soils) at the same meeting.</p>

<p><strong><em>ACTION</em></strong> - Russell Jones offered to coordinate - EFED to discuss and consider adding to the Agenda for the September EMWG meeting.</p>

<h3>CARES (Paul Hendley)</h3>

<p>A presentation of the current status of and capabilities of the CARES (Cumulative and Aggregate Risk Evaluation System) model was made at OPP following the PLUS presentation on May 29, 2003.  Paul Hendley thanked EFED for the opportunity for the chance to discuss these issues - the key things for the EMWG group to consider are the details of what is needed to cost effectively address daily aspects of dietary water /residue intake.</p>

<h3>Drinking Water Exposure Estimates for Dietary Risk (Kevin Costello)</h3>

<p>HED (Health Effects Division) wants to add a tier to their DEEM (Dietary Exposure Evaluation Model) runs.  The goal is to implement exposure estimates of the distribution of daily water concentrations of pesticides.  Implementation team has been in place since February.  The team is currently evaluating options for moving from single values to distributions - and presenting guidance to EFED scientists on what factors to consider when evaluating issues while making sure that adequate conservatism is maintained.</p>

<p>Some issues to address include:</p>

<p>Need to look at peak shapes, return frequencies and many other factors</p>

<p>Not well defined how EPA will move from DWLOC single points to probabilistic distributions</p>

<p>Some in HED are doing a similar exercise on dietary and residential.</p>

<p>With time HED will be able to move from DWLOC type tier and use probabilistic approaches more routinely.  Risk managers, EFED, HED and others will all need to be involved in blending the various components and probabilities.  Work on regional assessments will come later. </p>

<p>Russell Jones pointed out the need for a reduced workload option to avoid doing too much work on water issues when water is not the dominant variable.  Kevin Costello felt that since the HED folks will have to be looking at DEEM anyway, the addition of the water component may not be a huge workload issue.</p>

<h3>EFED Water Quality Projects (Betsy Behl)</h3>

<p>Several projects mentioned at last meeting have been approved:</p>

<ul>
<li>Rice tier 1</li>
<li>QA/QC model reviews</li>
<li>Scenario public comment evaluation </li>
<li>GW model evaluation</li>
<li>Regional PCA evaluation to replace national PCA values</li>
<li>Progress will be made over the next three months</li>
</ul>

<p><strong><em>ACTION</em></strong> - Update on EFED water quality projects at the next meeting.</p>

<h3>PGW Database (Michael Barrett)</h3>

<p>Database fields have been linked to model needs but data entry model templates have not yet been sent out - these will be available before the next meeting.</p>

<p><strong><em>ACTION</em></strong> - Discuss formatting of Prospective Ground Water Study templates next meeting.</p>

<h3>EFED Current Issues in Env. Fate for Modeling (Mark Corbin)</h3>

<p>EFED pesticide environmental fate properties database under way.</p>

<p>Harmonization of EFED guidelines with OECD guidance is being worked on.</p>

<p>Field soil dissipation - will need a workshop to follow up on 2002 workshop -  this will help decide what agenda will be appropriate for an ACS symposium in Spring 2004 in Anaheim.</p>

<p><strong><em>ACTION</em></strong> - Don Wauchope to post proposal for a symposium on field soil dissipation at the ACS meeting in Spring 2004.</p>

<p>Half life calculation policy - first order calculation is necessary as an initial step because of the needs of existing models.  The policy will cover data from lab and field studies - aimed at ensuring consistency between reviewers and between reviewers and contractors.</p>

<p>Questions:</p>

<p>Does it address correlated data in order to do QA and how to evaluate the results?  Mark reported that the method for dealing with errors in the data is already covered.</p>

<p>Does this link to the FOCUS policy under development?  ·	No it is independent - but at the initial, very simple level should not be in conflict.</p>

<p><strong><em>ACTION</em></strong> - useful to add a discussion of half-life / fate property inputs for pesticide exposure models as a routine short subject for EMWG meetings.</p>

<h3>Scenario Public comment evaluation (Ronald Parker)</h3>

<p>Ron Parker is now leading this project which is separate from the evaluation of PLUS.</p>

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

<h2 id="major">MAJOR TOPIC PRESENTATIONS</h2>

<h3>A Rapid Laboratory Method for Studying Synergism. - Jerry Hannan (Work
done at  Navy Research Lab - Synergism at EPA Beltsville Lab)</h3>

<p>The growth rate of a microorganism culture, minute-by-minute, was determined by monitoring the CO2 content of an air stream that has passed through the culture at a constant rate.  Any change in the growth rate caused by the addition of a toxicant is detectable in a matter of minutes. Examples investigated were the toxicity of stainless steel alloy rods, and herbicides including triazines and sulfonylureas.  These studies were based on the alga <em>Chlorella pyrenoidosa sorokiniana</em> but any rapidly growing microorganism (e.g. yeast) is worth considering in this regard.</p>

<p>Looked at inhibition of CO2 uptake/evolution in algae by SU's and Atrazine.</p>

<p>Atrazine switches off CO2 uptake and results in CO2 evolution</p>

<p>Sensitivity was exquisite (near pptw level) an nearly as low for atrazine.</p>

<p>Once the test species is in a linear phase the packed cell volume does not matter.</p>

<p>One could do a test, for example, by washing a treated part of the crop in the algal broth.</p>

<p><strong><em>ACTION</em></strong>:  All are recommended to pass the information on the algal inhibtion technology to others they work with who might be interested in herbicide and synergism screens.</p>

<p><strong><em>ACTION</em></strong>:  Jerry to provide his synergism talk to be put on the web site. </p>

<h3>FAO (UN Food and Agricultural Organization) Pesticide Eco-Evaluation
Materials for Developing Countries - Ronald Parker </h3>

<p>This project is designed to overcome practical constraints associated with pesticide
evaluation/registration in developing countries.</p>

<p>The proposed tools involve comparisons between a compound which is being evaluated and a reference or benchmark compound or compounds.</p>

<p>Originally the FAO tools were based on existing EFED models.</p>

<p>A number of recommended reference chemicals will be provided but a local regulator can add in additional reference compounds relevant to their country's situation.</p>

<p>Written guidance is currently under development.</p>

<p>No examples are yet available but the Field & External Affairs Division of OPP is currently recruiting staff people to work in this project. Work could begin within a month. </p>

<p>Users of the relative approach must be aware that this method yields a relative rather than an absolute measure of risk. If the evaluated chemical is compared to a chemical for which no information is available, no new information will be learned about the evaluated chemical.</p>

<p><strong><em>ACTION</em></strong>: Dr. Parker will update EMWG on progress of the FAO comparative model at the next meeting</p>

<h3>Update on Pesticide Usage Estimation Procedures to Support Interpretation
of Monitoring Data - Gail Thelin</h3>

<p>This project compares National Center for Food and Agricultural Policy (NCFAP) data with information from CA DPR's PUR database, NASS data and information received from industry - processing has been done by Pesticide Use Technical team (PUTT)</p>

<p>Agreement was generally fair to good</p>

<p>What were the absolute differences between estimates?? These have not been examined in this way</p>

<p><strong><em>ACTION</em></strong>: PUTT to send out specific requests for data from 90 watersheds for specific active ingredients to manufacturers</p>

<p><strong><em>ACTION</em></strong>: Industry to supply sales data ASAP - this is now limiting on wrapping this program up</p>

<p>Gail plans to re-express the differences between data set outputs in terms of absolute values.</p>

<h3>Software Integrating Frameworks for Pesticide Models - Gerry Laniak </h3>

<p>FRAMES 3MRA Tool to identify common threads within multi-media approaches to
environmental, human and ecological exposure and associated risk assessments</p>

<p>Example with multiple dimensions into an integrated modeling system - includes modular
approach to combine 17 different concepts.</p>

<p>Uses a Site-based strategy - farms, streams, ecosystems species...</p>

<p>Tiered approach - if no site data use national database</p>

<p>Selects 200 samples across all sites - developed site based data set - heavily into GIS operation used data from all HW sites </p>

<p>Links Ecoregions to Hazardous waste sites</p>

<p>Essence of system includes:</p>

<ul>
<li>Science based models</li>
<li>Large scale environmental databases</li>
<li>User interfaces</li>
<li>GIS based data access</li>
<li>API's for maintaining data within modeling system</li>
<li>Data analysis and visualization tools</li>
<li>Distributed computing</li>
</ul>

<p>Most of the elements above are infrastructure issues and could be handled by a general system - that is what FRAMES is above</p>

<p>Advantages of this process - basically lets concentrate on the science and leave the modeling detail to a system.</p>

<p>Everything based on dictionaries and metadata framework</p>

<p>Lots of effort has gone into dictionary editors and conversion editors</p>

<p>There is an Interagency memorandum of understanding (MOU) on multi-media Modeling:
statement of purpose</p>

<ol>
<li>Seven agencies are collaborating</li>
<li>Technology group is looking at GIS linkages, execution management...</li>
<li>BASINS is an example - looking for a generic tool</li>
</ol>

<p>Found that this technology leads to science integration and is best done on the back of specific models.</p>

<p>It takes perhaps six months to get a "new model" incorporated.</p>

<p>This is a good tool for pulling out GIS datasets to drive a model.</p>

<p><strong><em>ACTION</em></strong>:  Gerry to make his slides available via the web</p>

<h3>PRZM/EXAMS quality control issues update - Thuy Nguyen </h3>

<p>Details of the QA/QC procedure adopted for the PE4.pl model (a user shell that runs PRZM and EXAMS for aquatic exposure assessments) were presented.</p>

<p>PE4.pl uses the EXAMS model NOT ANEX.</p>

<p>Code modifications of PE3.PL  have been conducted to ensure correct reporting of instantaneous concentrations, to incorporate temperature data into EXAMS simulations, and to correct stream flow conditions for the standard pond and index reservoir.  </p>

<p>Relatively small differences (average of 4.4%) occurred in the results between runs with the DOS versions of the models, PE3.PL, and PE4.PL.   There was strong evidence that these differences were due primarily to differences in selection of individual input parameter values by the model operators for the test.</p>

<p>The authors concluded that the previous shell version (PE3.PL) has been successfully
reprogrammed (PE4.PL (version 1 dated January 9, 2003)) to provide reliable extraction of
instantaneous concentrations, appropriate hydrology parameters for index reservoir and standard pond, and reliable parameterization of monthly average temperatures.  </p>

<p>Exact replication of concentrations from the benchmark DOS simulations and PE4.PL did not occur as expected, because of effects of some specific operator decisions rather than because of inherent problems in program operation.  An example of this is that in some cases inappropriate stream hydrology conditions (SEEPS, EVAP, STSED) were used in the standard pond and index reservoir.  These conditions could be attributed, to modeler error as well as well as insufficiently explicit instruction in the original QA/QC plan. </p>

<p><strong><em>ACTION</em></strong>: Dr. Nguyen to put her presentation on QA/QC on the web site.</p>

<h3>GIS Watershed Analysis for Refined Aquatic Risk Assessments - Jim Carleton</h3>

<p>Reviewed determination of  static water bodies (ponds) and pond sizes on  a HUC by HUC basis.</p>

<p>Picked a HUC (7130009) in central IL  - highly managed and most wetlands converted except those largely associated with the linear features are maintained</p>

<p>Hand merged all the SDTS 30 m DEM's to produce a seamless coverage</p>

<p>Jim did not have NED so had to join them himself.</p>

<p>Linked to NLCD 30 m coverage and  compared NLCD wetlands with NHD streams.</p>

<p>Reviewed by hand editing from DOQQ removed non-water areas indicated in NLCD as ponds.</p>

<p>Left in all dammed streams.</p>

<p>7000 ponds were left in the HUC, then  calculated watershed area based on DEM's</p>

<p>Ratios of watershed to water body area ranged from small to >10000 - may be due to.</p>

<p>Plotted Ag land water area ratios.</p>

<p>Fit to delta log normal function.</p>

<p>Interesting watershed delineation based on 30 m DEM's.</p>

<p>Suggestions</p>

<ul>
<li>Try Av-SWAT watershed delineation tool. </li>
<li>Use NASS to replace NLCD for detailed crops.</li>
<li>Validate opposite 1:24000 topos to see what we captured and what we missed.</li>
</ul>

<p><strong><em>ACTION</em></strong>:  An EPA intern will be picking up this program and applying the same or better technology.</p>

<p><strong><em>ACTION</em></strong>:  Jim might want to consider sharing the results for this HUC to see if there is further useful information that can be drawn from the area comparison data sets.</p>

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

<h2 id="summary">Summary of New Action Items</h2>

<ol>

<li><p>Russell Jones to circulate reference to Piacenza journal with details of the conference proceedings (will be added to minutes).</p></li>

<li><p>Don Wauchope will circulate an Excel spreadsheet of combined databases (<em>Pesticide Properties</em> and SPISP) when available - aiming for the end of August.</p></li>

<li><p>Michael Barrett to consider adding a progress update on the EPA chemical properties database to the September agenda.</p></li>

<li><p>Dave Jones's group will report on progress on rice Tier 1 model at the next meeting</p></li>

<li><p>Ron Parker will check on potential availability of a national Dunne Overland Flow
coverage (see notes about the WARP model, below).</p></li>

<li><p>Michael Barrett to add an agenda item to review background to WARP together with
initial results from the Community water systems  for next time (and invite Charlie Crawford)</p></li>

<li><p>Paul Hendley will circulate the outcome of the SDTF meeting on June 11 via the list server.</p></li>

<li><p>The instructions for accessing and installing the latest version of EXPRESS were made available at the end of the meeting after many members had left, these instructions should be put on the web site and a note sent around via the list server to alert people to its availability</p></li>

<li><p>EFED to check why PE4.pl has not yet been made available on the website - DONE</p></li>

<li><p>EFED will consider adding an item to discuss Tier 2 GW needs and conceptual model to the agenda for the September meeting </p></li>

<li><p>Russell Jones offered to give / coordinate a presentation on the performance in different soil types/ environmental settings of PRZM, including a discussion of why or why not the model may provide realistic pesticide leaching estimates in different situations.  This would also include some discussion of how alternative models may or may not suffer from the same limitations as PRZM. (and whether there are any other viable alternative models for structured soils) - EFED to discuss and consider adding to the Agenda.</p></li>

<li><p>Michael Barrett will schedule progress reports on the EFED research programs at the next EMWG meeting</p></li>

<li><p>Michael Barrett still to circulate PGW database templates and, if appropriate,  will arrange for a discussion topic on this at the September EMWG.</p></li>

<li><p>Don Wauchope to post the proposal or the soil dissipation meeting at ACS (spring 2004) on the FEMVTF web site.</p></li>

<li><p>It would be desirable to have a routine progress report on the calculation of half lives for future EMWG meetings.</p></li>

<li><p>All are recommended to pass information on the algal inhibtion technology on to others they work with who might be interested in herbicide and synergism screens</p></li>

<li><p>Jerry Hannan to provide his synergism talk to be put on the web site. </p></li>

<li><p>Ron Parker to update the EMWG on progress of the FAO comparative model at the next
meeting.</p></li>

<li><p>Thuy Nguyen to put her presentation on QA/QC on the web site.</p></li>

<li><p>An EPA intern will be picking up the spatial approach to defining ponds and watershed sizes and applying the same or better technology; it would be useful to get an update at a future meeting.</p></li>

<li><p>Jim Carleton might want to consider sharing the pond area/ watershed area ratio data for the example HUC to see if there is further useful information that can be drawn from the area comparison data sets</p></li>

<li><p>PUTT to send out specific requests for data from 90 watersheds for specific active
ingredients to manufacturers.  Industry should supply sales data ASAP - this is now limiting on wrapping this program up.</p></li>

<li><p>EPA to check on the availability of an orchard spray drift study run in concert with Mexico in the mid to late 90's??</p></li>

<li><p>Dave Valcore and Andrew Hewitt to supply copies of their presentations to EPA for
placing on the web site.</p></li>

<li><p>Gerry Laniak to make his slides available via the web.</p></li>

<li><p>EPA to confirm that the next meeting of FIFRA EMWG will be on Tuesday 30th
September.  The meeting will be held in Crystal Mall II, Arlington, VA in room 1126 (the
"fishbowl")</p></li>

</ol>

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

      <!-- #EndEditable --> 

</div> <!-- END CONTENT -->

<hr class="skip" />

<div id="area-nav"> <!-- BEGIN LEFT SIDEBAR NAVIGATION -->
	<h3 class="skip">Local Navigation</h3>
	<ul>
		<li><a href="http://www.epa.gov/pesticides/">Pesticides Home</a><hr /></li>
		<li><a href="http://www.epa.gov/pesticides/science/index.htm">Science & Policy Home</a></li>
		<li><a href="http://www.epa.gov/pesticides/science/committees.htm">Advisory Committees</a></li>
		<li><a href="http://www.epa.gov/pesticides/science/policies.htm">Policy & Guidance</a></li>
		<li><a href="http://www.epa.gov/pesticides/science/guidelines.htm">Test Guidelines</a></li>
		<li><a href="http://www.epa.gov/pesticides/science/models_db.htm">Models & Databases</a></li>
		<li><a href="http://www.epa.gov/oppbead1/labs/index.htm">Laboratories</a></li>
		<li><a href="http://www.epa.gov/oppbead1/methods/index.htm">Analytical Methods Procedures</a></li>
	</ul>
</div> <!-- END LEFT SIDEBAR NAVIGATION -->

<hr class="skip" />

<div id="footer"> <!-- BEGIN FOOTER -->
	<ul id="globalfooter">
		<li><a href="http://www.epa.gov/">EPA Home</a></li>
		<li><a href="http://www.epa.gov/epafiles/usenotice.htm">Privacy and Security Notice</a></li> 
		<!-- BEGIN AREA COMMENTS LINK -->
		<!-- CHANGE link to point to your own contact page -->
		<li class="last"><a href="http://www.epa.gov/pesticides/science/contacts.htm">Contact Us</a></li>
		<!-- END AREA COMMENTS LINK -->
	</ul>

</div> <!-- END FOOTER -->

<p class="skip"><a id="skipbot" href="#content" title="Jump to main content.">Jump to main content.</a></p>
</body>
</html>