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Californi*gional Water Quality co>r�ol Board <br /> Central Valley Region <br /> Karl E.Longley,ScD,P.E.,Chair <br /> Linda S.Adams <br /> Secretaryfor Sacramento Main Office Arnold <br /> Environmental 11020 Sun Center Drive#200,Rancho Cordova,California 95670-6114 Schwarzenegger <br /> Protection Phone(916)464-3291 •FAX(916)464-4645 Governor <br /> httP://www.waterboards.ca.gov/centralvalley <br /> 25 April 2008 ���� <br /> APR 2 9 2008 <br /> Mr. Kirk Williams ENVIRONi <br /> TH <br /> Agrium PERMI /SERVICESTH <br /> P.O. Box 1986 <br /> 6 Executive Drive <br /> Collinsville, IL 62234 <br /> REVIEW OF REPORTS, DRAFT MONITORING AND REPORTING PROGRAM, WESTERN <br /> FARM SERVICE, STOCKTON, 1905 BROADWAY, SAN JOAQUIN COUNTY <br /> Western Farm Service has been monitoring groundwater flowing beneath its Stockton facility <br /> from 29 monitoring wells in three water-bearing zones. Western Farm Service has also been <br /> monitoring an insitu pilot study evaluating the effectiveness of zero valent iron coated with an <br /> easily degradable carbon substance to treat 1,2,3-trichloropropane (1,2,3-TCP), nitrate and <br /> ammonium in shallow groundwater. In a June 2007 meeting, Western Farm Service <br /> requested that Central Valley Regional Water Quality Control Board (Regional Water Board) <br /> staff update its 2004 Monitoring and Reporting Program. Regional Water Board staff have <br /> reviewed the following documents prepared by GeoSyntec Consultants that describes the <br /> groundwater monitoring history and pollutant movement, proposes changes to the Monitoring <br /> and Reporting Program, describes the pilot study injections, and presents ongoing results of <br /> the pilot study. <br /> • 24 January 2007 In-Situ Pilot Test Implementation Report <br /> • 31 October 2007 2007 Annual Groundwater Monitoring Report (Annual Report) <br /> This letter discusses the state of the investigation and remediation, and summarizes <br /> discussions between Regional Water Board staff and Western Farm Service's consultant, <br /> GeoSyntec Consultants, that led to the development of the draft Monitoring and Reporting <br /> Program. The resultant draft Monitoring and Reporting Program is attached for your review <br /> and comment. <br /> GROUNDWATER OVERVIEW <br /> The apparent source for groundwater pollutants (1,2,3-trichloropropane, 1,2-dichloropropane, <br /> nitrate, ammonium, and assorted organic pesticides and herbicides) were on-site evaporation <br /> ponds which were excavated in 1996, lined and capped with engineered materials. The center <br /> of mass of the groundwater pollution has moved off-site, where a pilot study is taking place. <br /> California Environmental Protection Agency <br /> Cc?Recycled Paper <br />