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California Regional Water Quality Control Board <br /> Central Valley 5 ' <br /> 1 � 1 ' <br /> Linda S.Adams Arnold <br /> Secreran'.for Sacramento Main Office SchwarzenegKer <br /> £,�r,romnewal 11020 Sun Center Drive#200.Rancho Cordova.California 95670-6114 Cit»erm,r <br /> Proiecrron Phone(916)464-3291 •FAX(916)464-4645 <br /> httpnah ards.ca.go\/central alle\ <br /> D EVE <br /> n EC <br /> 14 December 2006 <br /> pEC 1 8 2006 <br /> ENV1R M1M/S`E��CAS H <br /> PER <br /> Mr. Allen Fetters <br /> 3705 Portsmouth Circle North <br /> Stockton, CA 95219-3842 <br /> REVIEW OF REPORTS AND MONITORING WELL WORK PLAN.. RIPON FARM SERVICE, <br /> 938 FRONTAGE ROAD, RIPON, SAN JOAQUIN COUNTY <br /> The City of Ripon maintains municipal wpter supply well No. 12, which contains elevated <br /> concentrations of nitrogen and is about �Ob feet west of Ripon Farm Service. Ripon Farm <br /> Service handles nitrogen fertilizers and has an on-site domestic supply well which also <br /> contains elevated concentrations of nitrogen. The City of Ripon suspects that Ripon Farm <br /> Service has contributed nitrogen to its municipal supply well. Therefore, Ripon Farm Service <br /> is conducting a subsurface investigation to answer the following questions: 1) Has there been <br /> a release of nitrogen from Ripon Farm Service's facility to groundwater? 2) If there has been <br /> a release, has nitrogen from Ripon Farm Service entered City of Ripon's municipal well <br /> No. 12? 3) If a release from Ripon Farm Service has entered the municipal supply well, what <br /> portion of nitrogen in Well No. 12 is attributable to Ripon Farm Service? <br /> Recent investigative reports include the following: <br /> • 28 September 2006 Summary of Groundwater Sampling Data by Genesis Engineering & <br /> Redevelopment <br /> • 2 October 2006 Quarterly Report— Third Quarter 2006 by Advanced GeoEnvironmental, <br /> Inc. <br /> • 27 October 2006 Limited Subsurface Investigation Repod by Advanced GeoEnvironmentU:, <br /> Inc. <br /> • 30 October 2006 Summary of Groundwater Sampling Data by Genesis Engineering & <br /> Redevelopment <br /> These reports were reviewed by Regional Water Quality Control Board (Regional Water <br /> Board) staff as was the following work plan: <br /> • 21 August 2006 Work Plan for Monitoring Well Installation prepared by Genesis <br /> Engineering & Redevelopment, delivered via email 5 December 2006. <br /> Investigation Results <br /> Ripon Farm Service installed four shallow monitoring wells (screened interval between 20 and <br /> 40 feet below ground surface) in the operations area in 2005, and these wells have been <br /> sampled at least six times over the past four quarters. All of these wells contain nitrate (as <br /> California Environmental Protection Agency <br /> Z11 Ke'err Iced Paper <br />