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: EP A Response to Atrazine Monitoring Program (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 of Agreement (MOA) between atrazine registrants and EPA states: 

"If TCT Levels are discovered in any CWS infinished water equal to or greater than 2.6 

ppb as an annual average or in raw water at the drinking waler intake equal to or 

greater than 12.5 ppb as a 90-day roLling average through reliable monitoring data. that 

CWS shall be incorporated into the Weekly and BiweekLy monitoring programs as 

described in paragraph 2 above and subject to cessation pursuant to paragraph 3 

above . .. 

In the past 5 years (2007-2011), 68 of the 78 CWS for which Syngenta requested 

decommissioning have neither met nor exceeded the finished or raw 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 of Pesticide Programs' level of concern 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 of the 78 sites requested for 

decommissioning. Although these 10 CWS have not met or exceeded the Office of Pesticide 

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Programs' level of concern 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 in the AMP (2.6 ppb 

Total Chloro-Triazines (TCT) as an annual average). These 10 CWS and the corresponding 

number of additional years of weekly 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 of the 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 Water Works 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 

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*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 ppb TCT and the raw water 90-day rolling average 

will be <12.5 ppb TeT in each future site-year monitored. 

If you have any questions regarding EPA's review of the AMP decommissioning request, 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 of Pesticide Programs. April 9, 2012. Evaluation of Drinking Water 

Monitoring Datafor Total Chloro-triazines (YCT) for Decommissioning MOl1itoring Sites 

in the Syngel1ta Atrazine Monitoring Prog ram of Community Water Systems (CWS). 

cc: 

Scott Page, Drexel Chemical Co. 

Kris Venkatesh, Makhteshim Agan of North America, Inc. 

Joseph Burley, Sipcam Agro USA, on behalf of Oxon Italia SPA 

Jamie Green, Region 7 

Craig Carroll, Region 6 

Andrea Medici, EP AJOGC 

Richard Keigwin, EPAlOPPIPRD 

Steven Weiss, 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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