Document ID: EPA-HQ-OPP-2007-0725-0013
Agency: epa
Document Type: Supporting & Related Material
Title: 
Posted Date: 2007-11-20T05:00Z

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<p>To ensure the protection of ground water resources, the Acetochlor Registration Partnership has agreed to conduct prospective ground water studies in 8 locations  representing the full range of soil textures consistent with the acetochlor label.   Toward that end, sites outside of the Midwest were included in order to study the  leaching potential of acetochlor in other hydrologic regimes within the use area.  The  results of these studies will be compared to <a href="index.htm#TRIGGERS">triggers</a>  established by the Registration Agreement to determine if mitigation (or cancellation) is  necessary to prevent contamination of ground water by acetochlor.</p>

<p>The Acetochlor Registration Agreement specifically states that:</p>

<p><strong>1.2.1  Prospective Ground Water Study Program</strong></p>

<p>Upon registration of acetochlor, the ARP commits to conduct 8 Prospective Ground Water  Studies (PGW), in accordance with current PGW protocols and time lines approved for other  herbicides.  The test sites will be located in areas which are representative of use in  accordance with label directions, or in accordance with widespread and commonly  recognized practice, including vulnerable and typical use situations.  The eight sites  chosen for the PGW studies shall represent the full range of vulnerable and general use  soil textures consistent with labeled use.  The timing, design and conduct of the PGW  shall be a "reserved issue" governed by the provisions of Section 7A.</p>

<h3> Acetochlor Site Selection Status </h3>

<p>The ARP and EPA have agreed to the geographic and soil texture ranges and the study  timing for the eight PGW studies required by the Acetochlor Registration Agreement.   These are briefly summarized in the following table.  In addition, the table lists when  EPA last received data from ongoing studies.  Studies in Pennsylvania and the Delmarva  Peninsula will commence in the spring of 1997.  A <a href="prospect.htm">U.S. map</a>  illustrates the states hosting these sites.</p>

<h3> ACETOCHLOR GROUND-WATER MONITORING UPDATE </h3>

<table class="table zebra">
<caption>PROSPECTIVE GROUND-WATER MONITORING STUDIES (PGW)</caption>
<thead><tr>
<th scope="col">State/County</th><th scope="col">Year Initiated</th>
<th scope="col">Soil Type (Intended)</th><th scope="col">Soil Type (Actual)</th>
<th scope="col">Most Recent Data Reported</th>
</tr></thead>
<tbody>
<tr><th scope="row">Ohio</th>
<td>1995 </td> <td> Silt Loam </td> <td> Silt Loam </td><td> November 1996 </td> </tr>
<tr><th scope="row"> Wisconsin </th>
<td> 1995 </td> <td> Loamy Sand </td><td> Loamy Sand </td> <td> November 1996 </td> </tr>
<tr><th scope="row"> Nebraska </th>
<td> 1996 </td> <td> Silt Loam </td><td> Silt Loam </td> <td> none </td> </tr>
<tr><th scope="row">Minnesota</th>
<td> 1996 </td> <td> Clay Loam </td><td> Sandy Loam </td> <td> none </td> </tr>
<tr><th scope="row">Iowa </th>
<td> 1996 </td> <td> Loam </td><td> Silty Clay Loam </td> <td> August 1996 </td> </tr>
<tr><th scope="row">Indiana </th>
<td> 1996 </td> <td> Sandy Loam </td> <td> Loam to Silt Loam </td> <td> none </td> </tr>
<tr><th scope="row">Pennsylvania </th>
<td> 1997 </td> <td> Silt Loam </td><td> Loam </td> <td> -- </td> </tr>
<tr><th scope="row">DE or MD </th>
<td> 1997 </td> <td> Loamy Sand </td> <td> </td><td> -- </td> </tr>
</tbody>
</table>

<p>Data is beginning to become available from the prospective studies initiated in 1995  and 1996.  Acetochlor has not been detected in soil water nor ground water after 9 months  of sampling at the Ohio and Wisconsin PGW sites. Acetochlor degradate acetochlor oxanilic  acid has been found in soil water as deep as 12 feet, and at concentrations as high as  2.2 ppb in Ohio.  Acetochlor oxanilic acid has been detected at concentrations below the  level of quantitation at the Wisconsin site, in soil water as deep as 6 feet.</p>

<p>Recent data indicates that acetochlor was detected in both shallow and deep monitoring  wells at the Iowa PGW site within a month of application. Acetochlor was detected in 7 of  16 individual wells during that sampling event. Six of the detections were at  concentrations below the level of quantitation of 0.05 ppb.  The remaining sample had an  acetochlor concentration of 0.06 ppb.  Acetochlor was not detected in ground-water  samples taken the subsequent month. The results of acetochlor degradate analysis have not  been reported.</p>

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