Document ID: EPA-HQ-OPP-2002-0258-0002
Agency: epa
Document Type: Supporting & Related Material
Title: 
Posted Date: 2007-08-28T04:00Z

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<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="#statement">Dissemination of New EMWG Organizational Statement</a></li>
<li><a href="#action">Review of Old Action Items</a></li>
<li><a href="#brief">Brief Updates</a></li>
<li><a href="#next">Date of Next Meeting</a></li>
<li><a href="#continuing">CONTINUING ACTIONS</a></li>
<li><a href="#new">NEW 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>EFED EPA OPP- Chair</td></tr>
<tr><td>Alan Rose</td><td>Valent</td></tr>
<tr><td>Betsy Behl</td><td>EFED EPA OPP</td></tr>
<tr><td>Richard Herrett</td><td>ARI</td></tr>
<tr><td>Rudi Pisigan Jr.</td><td>EFED EPA OPP</td></tr>
<tr><td>Marjo Carpenter</td><td>FMC</td></tr>
<tr><td>Mah Shamim</td><td>EFED EPA OPP</td></tr>
<tr><td>Robert Eganhouse</td><td>USGS</td></tr>
<tr><td>Jim Breithaupt</td><td>EFED EPA OPP</td></tr>
<tr><td>Charles Crawford</td><td>USGS</td></tr>
<tr><td>Richard Lee</td><td>EFED EPA OPP</td></tr>
<tr><td>Kevin Armbrust</td><td>MS State Univ</td></tr>
<tr><td>Jim Lin</td><td>EFED EPA OPP</td></tr>
<tr><td>Joe Massey</td><td>MS State University</td></tr>
<tr><td>Kevin Costello</td><td>EFED EPA OPP</td></tr>
<tr><td>T. S. Ramanarayanan</td><td>BayerCropScience</td></tr>
<tr><td>Mark Corbin</td><td>EFED EPA OPP</td></tr>
<tr><td>Russell Jones</td><td>BayerCropScience</td></tr>
<tr><td>Faruuque Khan</td><td>EFED EPA OPP</td></tr>
<tr><td>Carolyn Scrafford</td><td>Exponent</td></tr>
<tr><td>Cheryl Sutton</td><td>EFED EPA OPP</td></tr>
<tr><td>Mary Nett</td><td>Water Quality Consulting</td></tr>
<tr><td>Sid Abel</td><td>EFED EPA OPP</td></tr>
<tr><td>Susan Alexander</td><td>Stone Environmental</td></tr>
<tr><td>Alex Clem</td><td>EFED EPA OPP</td></tr>
<tr><td>Chris Stone</td><td>Stone Environmental</td></tr>
<tr><td>Mohamed Ruhman</td><td>EFED EPA OPP</td></tr>
<tr><td>Tammy Estes</td><td>Stone Environmental</td></tr>
<tr><td>Nelson Thurman</td><td>EFED EPA OPP</td></tr>
<tr><td>Paul Hendley</td><td>Syngenta</td></tr>
<tr><td>Jim Carleton</td><td>EFED EPA OPP</td></tr>
<tr><td>Piyush Singh</td><td>DuPont</td></tr>
<tr><td>David Jones</td><td>EFED EPA OPP</td></tr>
<tr><td>Mark Russell</td><td>DuPont</td></tr>
<tr><td>Lucy Shanaman</td><td>EFED EPA OPP</td></tr>
<tr><td>Don Wauchope</td><td>USDA ARS</td></tr>
<tr><td>Ron Parker</td><td>EFED EPA OPP</td></tr>
<tr><td>Paul Schwartz</td><td>USDA ARS</td></tr>
<tr><td>Ian Kennedy</td><td>EFED EPA OPP</td></tr>
<tr><td>Lajan Barnes</td><td>ET&S</td></tr>
<tr><td>Karen McCormack</td><td>EFED EPA OPP</td></tr>
<tr><td>Stuart Cohen</td><td>ET&S</td></tr>
<tr><td>Larry Burns</td><td>EPA ORD Athens</td></tr>
<tr><td>Qing Li Ma</td><td>ET&S</td></tr>
<tr><td>Ross Highsmith</td><td>EPA ORD/NERL</td></tr>
<tr><td>Scott Jackson</td><td>BASF</td></tr>
<tr><td>Nick Poletika</td><td>DowAgro</td></tr>
<tr><td>Claude Beigel</td><td>BASF</td></tr>
<tr><td>Tom Gilding</td><td>Crop Life America (CLA)</td></tr>
<tr><td>Dave Gustafson</td><td>Monsanto</td></tr>
<tr><td>Marty Williams</td><td>Waterborne Environmental Inc.</td></tr>
<tr><td>Mark Shocken</td><td>Uniroyal</td></tr>
<tr><td>Mark Cheplick</td><td>Waterborne Environmental Inc.</td></tr>
<tr><td>Amy Ritter</td><td>Waterborne Environmental Inc.</td></tr>
</tbody>
</table>

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

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

<p>Dirk Young (EFED/OPP) opened the meeting and welcomed a large number of attendees (>50). </p>

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

<h2 id="statement">Dissemination of New EMWG Organizational Statement</h2>

<p>Betsy Behl (EFED/OPP) briefly discussed the history of the EMWG and pointed out the changes in the new EMWG organizational statement.  The new statement is posted on the web at <a href="http://www.epa.gov/oppefed1/models/water/emwg_top.htm">http://www.epa.gov/oppefed1/models/water/emwg_top.htm</a>.    Model scenarios and presentations from the meeting can also be found at this web site.  EFED will be setting up a list server that will replace the Crop Life one.  Tom Gilding will provide EFED with a list of participating email addresses for the new list server.  The EPA server will be used to raise relevant topics for discussion for EMWG meetings.  Under the new EMWG charter, EPA will take the lead responsibility for chairing the meetings and posting the minutes on the web.</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>Industry members to review GENEEC2/FIRST programs - this item was dropped.</p></li>

<li><p>Registrants to consider submitting electronic data from PGW studies as a step in developing the PGW database.  Mike Barrett is working on template to facilitate submission of data and is open to suggestions for structuring the database - covered below.</p></li>

<li><p>EFED to provide electronic file of scenario document - completed</p></li>

<li><p>EFED to finalize and send out revised PGW guidance - Betsy reported that the guidance is largely revised.  They have incorporated irrigation comments, modified the data reporting section, and are now reviewing comments from industry and SAP for incorporation.  There will not be any more rounds of comment for this document.</p></li>

<li><p>EFED to issue draft QA/QC plan for newly developed models - Dave Jones is working on this document which should be ready for comment soon.  As currently envisioned, it will consist of two documents: a list of current models and procedures for model version control and a more detailed QA/QC plan</p></li>

<li><p>Paul Hendley suggested that EPA consider adding a discussion about the development of a US-wide depth to groundwater layer as an agenda item, possibly at the December meeting.</p></li>

<li><p>Larry Burns to send a message via the EMWG list server when SAMSON data becomes
available  - discussed later in meeting</p></li>

<li><p>Which AgDRIFT version to use - addressed later</p></li>

<li><p>All to review ET&S environmental turf scenarios posted on the list server - no comments received.  ET&S will have another document covering PCT for sod farms. </p></li>

<li><p>Industry to review new scenarios - completed</p></li>

<li><p>Anyone with time to participate in developing rice model should contact Betsy Behl - limited contact so far.</p></li>

<li><p>EFED progressing on list server - paperwork sent in; everyone needs to use the EPA list server.  Copies of presentations at the meeting will be posted on the EFED website.  </p></li>

<li><p>Ev Byington to send out meeting findings to interested EMWG members - covered by
Wauchope.</p></li>

<li><p>EFED to update EMWG with suggested goals for 2003 - EFED will present at next meeting.</p></li>

</ol>

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

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

<h3>PRZM-EXAMS - Larry Burns (ORD)</h3>

<p>- reported that there are plans to introduce version 3.12 as well as 3.22 into EXPRESS.   After these versions are incorporated, the EXPRESS models will need to go
through the model approval process to be developed by EFED.  ORD is looking at ways to
provide approved models for the user communities, while at the same time allowing minor
updates to be incorporated. The group noted that there needs to be a better way of providing updated manuals.</p>

<h3>AgDRIFT - Norm Birchfield</h3>

<p>- reported that AgDRIFT is being used successfully to estimate exposure in the Agency's risk assessments and to calculate the impacts of proposed risk mitigation options.   EFED/OPP is currently using version 2.01 of the model.  Norm described the positive attributes for models that OPP uses:</p>

<ol>
<li><p>EFED's models must be of appropriate quality and rigour for risk assessment and risk management applications.</p></li>

<li><p>To the extent practicable, EFED seeks input, collaboration, and peer review from the scientific community in the development, evaluation, and implementation of models.</p></li>

<li><p>To encourage transparency, EFED prefers to use models that are easily available to the public (including the underlying code).</p></li>

<li><p>EFED needs to be able to modify and adust models, efficiently adapt models to
evolving risk assessment methodology, and interface multiple fate and effects models.
Norm also reported on some of the outstanding issues that have slowed the
implementation process and that need to be resolved within the Spray Drift Task
Force(SDTF):</p></li>

</ol>

<ol>
<li><p>Since the completion of the CRADA, AgDRIFT has been controlled by industry</p></li>

<li><p>It has been modified without consent from the Agency.</p></li>

<li><p>The SDTF controls any changes to the model.</p></li>

<li><p>The Task Force has placed conditions on Agency-suggested model modifications.</p></li>

<li><p>License restrictions on AgDRIFT limit the use and analysis of the model.</p></li>

<li><p>AgDRIFT's end user license agreement is not written in plain English.</p></li>

<li><p>License restrictions on AgDRIFT hinder distribution of the model to the public.</p></li>

<li><p>License restrictions of AgDRIFT would likely apply to models that are interfaced with AgDRIFT in a single software package.</p></li>

<li><p>The SDTF has proposed that the Agency not freely use the model for risk assessment
and risk management of non-SDTF company products.</p></li>

</ol>

<p>In response to a question about AGDISP, Norm mentioned that the Agency has not
committed to any one model at this time.  They will be reviewing each model according to the positive attributes listed above and then make a decision.  If the above issues with AgDRIFT are not resolved in a timely manner, though, the Agency may be forced to use other models, such as AGDISP, in future risk assessments.  Dave Jones emphasized the importance of having a level playing field for using the model.  </p>

<p>T.S. Ramanarayanan noted that there are differences of opinion among the Task Force
members over these issues.  They will try to make the Task Force model available and respond to the Agency's concerns in writing.</p>

<p>It was pointed out that the SDTF still has concerns about the need for a formal letter of approval for use of the SDTF data set and the need for an SOP before the model is used.  Betsy Behl asked why the SOP is needed.  Larry Burns pointed out that the Norm Birchfield letter has created ripples in ORD.  It was also noted that homeland security issues may restrict the distribution of the model. </p>

<h3>Spray Drift Task Force Progress - T.S. Ramanarayanan (BayerCropScience)</h3>

<p>- reported that public and regulatory versions of AgDRIFT are still available on the web after passing a security clearance.
(<a href="http://www.agdrift.com">www.agdrift.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>).   He was not aware of any changes in the code for AgDRIFT.  The contractor found a bug in the AGDISP model that was accidentally carried over into AgDRIFT.   The Task Force is looking at a wider range of ground and orchard data in order to produce a mechanistic predictive tool that will permit mitigation calculations with these application modes.</p>

<h3>Rice Modelling - Jim Breithaupt (EFED/OPP)</h3>

<p>- stated that the scenario work for the rice model is mostly complete with the exception of the irrigation details (cascade flow vs zero flow).  His proposal has been submitted to management and he hopes to complete the project in time for a June 2003 SAP to discuss the model.  Dave Jones will be the co-lead for this project.</p>

<h3>European Union Activities - Russell Jones (BayerCropScience)</h3>

<p>reported on EU activities and stated that three new FOCUS groups have been formed.  These groups include a landscape and mitigation group, an air exposure group, and a group aiming to develop guidance for estimating degradation kinetics.  Although the EU has invited an EFED participant to join the process and the EFED director has expressed an interest, the resources for this activity have not been approved.   Russell
recommended that EFED resolve this question ASAP so that the person can play an important
part in the subgroup meetings next January.</p>

<p>Mark Russell (DuPont) reported that the FOCUS surface water scenario group has
produced six tile drainage scenarios and four runoff scenarios, each of which discharge in three types of surface water bodies.  The models used include MACRO, PRZM, TOXSWA.  Delays have resulted from trying to build a dynamic hydrology solution to describe water movement.  The schedule calls for the models to be completed by the first week in December for the EU.  The scenarios will then be made available on the web.</p>

<p>Action Item: EFED to decide on participation in EU FOCUS groups.</p>

<h3>USDA/ARS Activities - Don Wauchope</h3>

<p>- reported that Ev Byington is putting together a fiscal initiative for a turf research project that would start in 2004.  The ARS modular modelling effort is progressing and now has a GIS interface.  RZWQM has an erosion model that is under development.  ARS will also be incorporating pesticide calculations into the riparian ecosystem model (REM).  It uses the NRCS design for three ecosystems and will include long-term binding and ionic capability.   After it is working, the module should be transferred into ANAgNPS and SWAT.</p>

<p>Stu Cohen asked about REM's capability to handle buffer calculations. Don replied that
it can not be used for pesticides yet.  Tifton has a limited amount of pesticide data that could be used to calibrate this module.   Rob Malone is organizing the MESA database to develop scenarios for the data.</p>

<h3>Environmental Fate Database - Mah Shamim</h3>

<p>- provided a handout from a previous meeting that listed the fields in the fate
database.  A new version of the database will be available internally to EFED by the end of this month and could be released when QA/QC is complete.  The goal is to release the database to the public in about four months.  Ultimately, this database could interface with other databases and be web accessible (a living database).</p>

<h3>New Meteorological Files - Sid Abel</h3>

<p>- reported that EFED has matched new met files from ORD with 58 new scenarios.  They have performed comparison runs between the old weather sets and the new ones and found only small changes.  The weather station data is available from the ORD web site.  A
draft memo authorizing implementation of the weather station sets is under review.  EFED hopes to announce the official transfer to the use of the SAMSON weather on October 1.  Larry Burns (ORD) noted that EXAMS includes automatic output of the new met files.  An FR Notice was published, and public review is underway for the new PRZM/EXAMS scenarios.  Comments received so far have been minor.</p>

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

<p>- discussed the turf initiative and reported that meetings have been held  between EFED and industry.  She also described the group's progress in setting up two field studies in MS and MD, and the compilation of the data from research studies funded by USGA.  Dave Gustafson (Monsanto)asked about which modelers will be involved in assessing the protocol for the field study.  Those who wish more information on the turf umbrella program can contact Mary Nett at Water Quality Consulting 
<a href="mailto:mnett.wqc@msn.com">(mnett.wqc@msn.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>

<h3>EFED Water Quality Tech Team Priorities for FY 2003 - Jim Carleton (EFED/OPP)</h3>

<p>- discussed EFED's proposed WQTT projects for 2003.  These include:</p>

<h4>Short-term projects </h4>

<p>(not prioritized)</p>

<ul>

<li><p>PGW Guidance</p></li>

<li><p>Drinking water SAP/protocol</p></li>

<li><p>FQPA tiering paper</p></li>

<li><p>Modelling SAP scheduled for Feb or March 2003.</p></li>

<li><p>PRZM/EXAMS training</p></li>

<li><p>GW model maintenance (Tier 1)</p></li>

</ul>

<h4>Longer term projects</h4>

<p> (not prioritized)</p>

<ul>

<li><p>SW monitoring guidance</p></li>

<li><p>GIS vulnerability assessment tool</p></li>

<li><p>Rice model</p></li>

<li><p>Estuary model</p></li>

<li><p>PGW database</p></li>

<li><p>WARP</p></li>

<li><p>Upgrading PRZM hydrology</p></li>

<li><p>90%ile scenarios</p></li>

<li><p>Investigating runoff models</p></li>

<li><p>Trends in monitoring data</p></li>

<li><p>Uncertainty quantification</p></li>

</ul>

<p>Some of the participants asked if PRZM training could be made available for the public
after EFED personnel are trained.  EFED participants pointed out that this is a budgetary issue, and indicated that the interest in such public training would be raised to EFED management.</p>

<h3>Refined Risk Assessment - Ingrid Sunzenauer</h3>

<p>- described the new Tier II ecological risk assessment model development.  After the refined risk assessment process was created, it was followed by an exploratory exercise with compound X (carbofuran) which was reviewed by the SAP.  The compound X models are being refined and should never be considered final.  EFED would like to make the models available for SAP consideration in April 2003.</p>

<p>The terrestrial model development is following the outline of the carbofuran work.  The exposure distributions are based on residue variability and biological variability, and tools exist to provide a convenient representation of the uncertainties. </p>

<p>Ingrid also noted that research is needed on such topics as terrestrial dietary behavior, preparing estimates of residues on or in insects, addressing questions of whether birds eat dead or moribund insects and the extent of consumption of drinking water from dew puddles, etc.  It is also important to obtain better estimates of pesticide residues in crop canopy, dermal transfer, etc. </p>

<p>Ingrid mentioned that she would like to find ways of pairing with stakeholders to avoid duplication of research and maximize research productivity.  EFED is also working with ORD, using extramural money, e.g., the estuary model, undertaking joint work with the Canadians, and collaborating with EUFRAM.  The EFED RRA group may set up a steering committee to track research and/or a CRADA to provide an effective research planning network.</p>

<p>Ingrid  introduced Donna Randall who is the new lead on aquatic RRA issues and
mentioned the web site for refined risk assessment: <a href="http://www.epa.gov/oppefed1/ecorisk/index.htm">www.epa.gov/oppefed1/ecorisk/index.htm.</a> </p>

<p>Action Item:  Ingrid will be placing the presentation of the refined risk assessment system on this web site.</p>

<h3>PRZM/EXAMS Scenarios - Tammy Estes (Stone Environmental) and Paul Hendley (Syngenta)</h3>

<p>- discussed questions raised by the industry review of about 50 new EFED scenarios. Stone Environmental was contracted by Industry to review the new EFED protocols.  Sid Abel indicated that these comments and others received in the public comment period would be reviewed after the close of the comment period.  Paul Hendley highlighted the need for more standardization to ensure that modelling scenarios used for risk assessments can be readily duplicated and the importance of version control for models and scenarios. </p>

<p>Industry representatives raised questions about spatial selection of scenario sites,
calibration of the scenarios, and how the Agency would use exposure estimates from the multiple scenarios in its aquatic risk assessments.  They will be submitting their detailed comments on the scenarios (and an ACCESS database comparing parameters across scenarios in the same general location) to OPP in response to the FR request for public comment.</p>

<p>Tammy Estes (Stone Environmental Inc) presented an overview of findings from a review
of individual scenarios.  She gave a number of examples of geographic, crop and soil related inconsistencies between scenario parameters within the same general area.  The review highlighted the importance of documenting more user selected factors, e.g. USLEC dates and factors, identifying the most significant input parameters, and making sure they are individually parameterized.  Besides  discrepancies in the documentation, Tammy stated that there were differences between the PRZM input files and documentation for the associated scenarios.  Industry members said that they were going to run a range of chemicals through the revised scenarios.</p>

<p>Action Item:  Industry will submit detailed public comments on the scenarios and an ACCESS database comparing the scenario parameters with the same area.</p>

<h3>EXAMINER - Paul Hendley (Syngenta)</h3>

<p>- demonstrated the model EXAMINER, a graphical post processor developed by Amy Ritter at Waterborne Environmental Inc.  The code for this processor can be made publicly available and is compatible with the EXPRESS shell to run multiple PRZM-EXAMS runs.  The tool does not modify any model code, input or output files.   Its purpose is to provide an automated visualization of PRZM and EXAMS output to facilitate data interpretation and reporting.  It can also use the RADAR tool to examine the frequency of occurrences exceeding certain threshold values and their durations and the range of intervals
between events. </p>

<h3>SCIGROW and PGW Database - Mike Barrett</h3>

<p>- reported that SCIGROW version 2.2 is available and that the EFED Tier 1 model is on the OPP web site: <a href="http://www.epa.gov/oppefed1/models/water">http://www.epa.gov/oppefed1/models/water</a>.    Barrett also reported that the PGW data handling database will be made available from Oak Ridge soon and evaluated internally.</p>

<h3>Industry Thoughts on Groundwater Modelling - Scott Jackson (BASF)</h3>

<p>- demonstrated the alpha version of a tool named PLUS-PRZM Leaching US that was designed to show alternatives for preparing Tier 2 evaluations of leaching potential.  According to Scott, this draft software offers potential for standardization of a wide range of groundwater risk related tasks that could simplify preparation and review of many commonly performed tasks associated with selecting PGW sites, interpreting PGW findings and considering alternative strategies for the mitigation of leaching.  It can also be linked to ADAM. The software is available on the Waterborne web site and can be reviewed.</p>

<p>Action Item: Interested participants will evaluate the alpha leaching code.  EPA will consider adding this item to the agenda for the next meeting.</p>

<h3>Update of WARP - Charlie Crawford (USGS)</h3>

<p>- gave a presentation on the regression model WARP.  WARP was designed to estimate the distribution of pesticide concentrations at unmonitored sites.</p>

<p> WARP can do the following:</p>

<ol>

<li>Directly estimate chronic and acute exposure in individual watersheds</li>
<li>Estimate the range of pesticide concentration distributions likely to occur within a region of the U.S.</li>
<li>Substantiate simulated concentrations, i.e., from PRZM-EXAMS</li>
<li>Determine whether additional monitoring data may be needed</li>
<li>Take advantage of new monitoring data to update the models.</li>

</ol>

<p>WARP cannot do the following:</p>

<ul>
<li>6.  Directly generate a daily time series of pesticide concentrations for a stream location</li>
<li>7.  Estimate the co-occurrence of multiple pesticides</li>
<li>8.  Incorporate factors that do not have data sets, i.e. buffer strips</li>
<li>9.  Address factors that significantly change the relationships underlying WARP models without new data that reflect the changes.</li>

</ul>

<p>Next steps include refining the multi compound model, develop daily time series approach, and transfer predictions for 7000 CWS's for validation.  The OP report is in the draft phase.   USGS would also like to use Syngenta's atrazine database to extend the data to reservoirs and examine the potential to use a WARP approach in these water bodies.</p>

<h3>Estuary Model - Jim Lin (EFED)</h3>

<p>- discussed the developments of an IAG-funded project for the design of an estuary model.  The site for this potential model is a high runoff environment in Bass Creek,
North Carolina (75 km<sup>2</sup> drainage area, 7.3 km long, 800 m wide, and 1 m deep).  The project designers have data sets for two chemicals and have designed a five-compartment model based on EXAMS (using average values to account for mixing).  The comment was made that salinity might be an issue to consider.</p>

<h3>Update on Standard Water Body Model, Fast Solution - Dirk Young (EFED)</h3>

<p>- developed a fast solution to run EFED's standard water body models, which will primarily benefit Monte Carlo (higher tier) analyses.  Because the solution is analytical, and performs fewer file reads and writes, the model runs in a fraction of a second.  Young emphasized that the solution is only for the two-compartment subset of EXAMS that EFED uses for its standard water bodies (pond and reservoir). Examples of its use for sensitivity analyses were also shown.</p>

<p>Some of the deviations from EXAMS include: </p>

<ol>
<li> temperature and flow changes can occur on a daily basis as opposed to only monthly changes in EXAMS  </li>
<li> daily temperature equals average of previous 30 days, rather than the average calendar month temperature</li>
<li> flow through reservoir is either the average 36-year runoff value or some user specified backward moving average.</li>
</ol>

<p>The new program can be operated from EFED's shell (Ian Kennedy) and is very fast and
saves the table 20 output values from each run. EFED plans to use this fast tool for RRA
eventually and will probably present it to the SAP in 2003.	</p>

<h3>Curve Number/Moisture Relationship - Ian Kennedy</h3>

<p>- discussed his project of investigating the natural variability of curve number and the effects antecedent of soil moisture.   Implied curve number from measured data (Wauchope field data) were plotted against antecedent soil moisture.  For this preliminary work with this small data set, natural curve number variability was so great that antecedent soil moisture did not provide a useful prediction of actual curve number.  For this data, a constant curve gave results as good as the variable antecedent-moisture driven curve numbers that PRZM uses.  More data is needed to further evaluate these preliminary results</p>

<p>As an aside, Kennedy examined the way that PRZM adjusts the curve number with changes in soil moisture.  Examination of the PRZM code indicated that the PRZM documentation for this curve number adjustment is incorrect, and Kennedy presented the actual way that PRZM makes the adjustments.  </p>

<p>Action Item: Paul Hendley and others to supply additional hydrology data sets for further investigation.</p>

<p>Action Item: EFED and ORD to work together to resolve the issue of correcting  PRZM
documentation.</p>

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<hr />

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

<p>The next meeting of the group will be held on December 12, 2002 at Crystal City if the Fishbowl is available.</p>
 
<p class="pagetop"><a href="#content">Top of page</a></p>
<hr />

<h2 id="continuing">CONTINUING ACTIONS</h2>

<ol>
<li><p>Tom Gilding (CropLife America) will send Betsy the list of email addresses on the CLA EMWG list server.</p></li>

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

<li><p>EFED to post policy identifying model versions and scenarios currently used for exposure.</p></li>

<li><p>All to use the new EPA  list server for open discussion.</p></li>

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

</ol>

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<hr />

<h2 id="new">NEW ACTIONS</h2>

<ol>

<li><p>Norm Birchfield requested to put letter of positive attributes of models on web site.</p></li>

<li><p>EFED to decide on participation in EU FOCUS groups.</p></li>

<li><p>All to send copies of their presentation to Betsy for posting on the web.</p></li>

<li><p>Industry will submit detailed comments to EFED on the scenarios and an ACCESS database comparing all the specific scenario parameters in response to FR request for public comments.  </p></li>

<li><p>Interested parties to evaluate leaching code provide in the meeting, and 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></li>

<li><p>Paul Hendley and others in industry to supply hydrology data from Small Scale Runoff studies to EPA to further investigate the relationship between the impact of CN and soil moisture.</p></li>

<li><p>EFED and ORD to correct PRZM documentation re: curve number adjustments</p></li>

<li><p>Betsy Behl to check room availability of the Fishbowl for the next proposed meeting on 12/12</p></li>

</ol>

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