UNITED STATES ENVIRONMENTAL PROTECTION AGENCY WASHINGTON. D
.C
.20460

E-MAIL Syngenta Crop Protection, INC. Attn: Dan Campbell, Regulatory Affairs PO Box 18300 Greensboro, NC 27419-8300 OFFICE OF CHEMICAL SAFETY AND POLLUTION PREVENTION April 11,2012

SUBJECT: EPA Response to Atrazine MonitoringProgram (AMP) Decommissioning Request Dear Mr. Campbell: EPA has reviewed Syngenta's December 12.2011 request for decommissioning 78 Community Water Systems (CWS) currently being monitored under the Atrazine Monitoring Program (AMP). The 2003 Memorandum ofAgreement (MOA) between atrazine registrants andEPA states: 

## "IfTCTLevels are discovered in any CWS infinishedwaterequal to orgreater than 2.6 ppb as an annual average or in raw waterat the drinking waler intake equal to or greater than 

### 12.5ppb as a 90-day roLling average through reliable monitoring data. that CWS shall be incorporated into the Weekly andBiweekLymonitoringprograms as described inparagraph 2 above and subject to cessationpursuant to paragraph 3 above. .. In the past 5 years (2007-2011), 68 ofthe 78 CWS for which Syngenta requested decommissioning have neither met nor exceeded the finished orraw water thresholds that trigger the requirement for atrazine registrants to monitor TCT weekly and biweekly in the AMP, as established in the above language from the 2003 MOA. Moreover, these systems have not met or exceeded the Office ofPesticide Programs' level ofconcern for drinking water (37.5 ppb TCT as a 90-day rolling average 

### in raw water). Therefore, EPA is decommissioning these 68 CWS from the AMP. Consistent with the 2003 MOA, EPA is retaining in the AMP 10 ofthe 78 sites requested for decommissioning. Although these 10 CWS have not met or exceeded the Office ofPesticide Page 1 of3Programs' level ofconcern for drinking water (37.5 ppb as a 90-day rolling average in raw water), they have met or exceeded the finished drinking water threshold that triggers the requirement for atrazine registrants to monitor TCT weekly and biweekly inthe AMP (2.6 ppb Total Chloro-Triazines (TCT) as an annual average). These 10 CWS and the corresponding number ofadditional years ofweekly and biweekly monitoring needed in each CWS until decommissioning may can be reconsidered by the Agency are listed in Table 1. Please see EPA's enclosed review ofthe decommissioning request for additional details. Table 1. CWS in the AMP Exceeding 2.6 ppb TCT as an Annual Average Concentration in Finished Water Within 5 Years Community Water Most Recent Year Meeting or Additional Years of State Exceeding Annual Average of System 2.6 ppb TCT in Finished Water Monitoring Needed*

Illinois Centralia Water Treatment Plant 2007 Through 2012 - 1 more year Illinois Evansville 2010 Through 2015 - 4 more years Farina Water Illinois Treatment Plant 2011 Through 2016 - 5 more years Illinois Mattoon 2010 Through 2015 - 4 more years Illinois Mt. Olive WaterWorks 2008 Through 2013 - 2 more years Beloit Water Kansas Department 2008 Through 2013 - 2 more years
Missouri Maryville Water Treatment Plant 2007 Through 2012 - 1 more year Ohio Blanchester 2009 Through 2014 - 3 more years McClure Water Ohio Treatment Plant 2008 Through 2013 - 2 more years Ohio Piqua--Swift Lake 2008 Through 2013 - 2 more years

Page 2 of3*The additional years of monitoring needed, as required by EPA and listed in this column, assumes that the finished water annual average will be <2.6 ppbTCT and the raw water 90-day rolling average will be <12.5 ppb TeT in each future site-year monitored. Ifyou have any questions regarding EPA's review ofthe AMP decommissioningrequest, feel free to contact me at 703-305-7106 or biscoe.melanie@epa.gov.

Enclosure:

# s~~**:/ '** 

# ~U{**/I.~----'** Melanie Biscoe Chemical Review Manager Pesticide Re-Evaluation Division

EPA Office ofPesticide Programs. April 9, 2012. Evaluation of Drinking Water Monitoring Datafor Total Chloro-triazines (YCT)for DecommissioningMOl1itoring Sites in the Syngel1taAtrazineMonitoring Program ofCommunity Water Systems (CWS). cc: ScottPage, Drexel Chemical Co. Kris Venkatesh, Makhteshim Agan ofNorth America, Inc. Joseph Burley, Sipcam Agro USA, on behalfofOxon Italia SPA Jamie Green, Region 7 Craig Carroll, Region 6 Andrea Medici, EP

### AJOGC Richard Keigwin, EPAlOPPIPRD StevenWeiss, EPAJOPPIPRD Anne Overstreet, EPAJOPPIPRD Donald Brady, EPAJOPPIEFED Dana Spatz, EPAJOPPfEFED Rosanna Louie-luzwiak, EPNOPPfEFED Michael Metzger, EPAJOPPIHED Karen Whitby, EPA/OPPIHED

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