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California F ;ional Water Quality Cont- ' Board a <br /> Central Valley Region <br /> Karl E.Longley,ScD,P.E.,Chair <br /> Linda S.Adams Arnold <br /> Secreta or Sacramento Main Office <br /> ryf 11020 Sun Center Drive#200,Rancho Cordova,California 95670-6114 Schwarzeneg; <br /> Environmental <br /> Phone(9]6)464-3291 •FAX(916)464-4645 Governor <br /> Protection <br /> http://www.waterboards.ca.gov/centralvalley <br /> 9 July 2008 11A 1 1 2008 <br /> ENVRONAAE[ HEALTH <br /> PERNI T/SERVICES <br /> Mr. Allan Fetters <br /> RF Land, Inc. <br /> 3705 Portsmouth Circle North <br /> Stockton, CA 95219-3842 <br /> REQUEST FOR INVESTIGATION, RIPON FARM SERVICE, 938 FRONTAGE ROAD, <br /> RIPON, SAN JOAQUIN COUNTY <br /> Between about 1960 and July 1999, Ripon Farm Service, Inc. owned and operated a <br /> fertilizer formulation and retail distribution facility at this site. Since July 1999, Ripon <br /> Farm Service, LLC has been the operator of the fertilizer formulation facility, and the <br /> land is owned by RF Land, Inc. <br /> RF Land, Inc. and Ripon Farm Service, LLC are currently investigating the lateral and <br /> vertical extent of soil and groundwater pollution, including obtaining vertical profiles of <br /> the stratigraphy and nitrate concentrations extending to a depth of about 200 feet below <br /> ground surface. Meanwhile, soil and water sampling results show that shallow <br /> groundwater contains nitrate and ammonium at levels exceeding water quality <br /> objectives, and soil in many of the operations areas contains ammonium and nitrate at <br /> concentrations that could be migrating to shallow groundwater. These results are <br /> documented in the following reports. <br /> • 27 October 2006 Limited Subsurface Investigation Report prepared by Advanced <br /> GeoEnvironmental Inc. <br /> 25 March 2008 Soil Sampling Report prepared by Genesis Engineering & <br /> Redevelopment. <br /> The data contained in these reports show that shallow soil near the sump contained <br /> 1,000 mg/kg ammonium, water from within the upper sump contained 1,100 mg/I <br /> ammonium and 940 mg/I nitrate-N (nitrate as nitrogen), and a shallow groundwater <br /> sample adjacent to the sump (B-102, 25 feet below ground surface) contained 780 mg/I <br /> ammonium and 910 mg/I nitrate-N. The concentration of nitrogen found in the soil, the <br /> sump, and shallow groundwater are similar in magnitude and suggest that there is <br /> migration of pollutants between the soil, the sump, and shallow groundwater. <br /> California Regional Water Quality Control Board, Central Valley Region (Regional <br /> Water Board) staff requests that RF Land, Inc., the current landowner, investigate and <br /> California Environmental Protection Agency <br /> Za Recycled Paper <br />