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Californifegional Water Quality Cool Board <br /> Central Valley Region <br /> Robert Schneider,Chair <br /> Arnold <br /> Linda Adams Sacramento Main Office <br /> Secretary Schwovern <br /> 11020 Sun Center Drive!1200,Rancho Cordova,California 956706114 Governor <br /> Phone( 3291 •FAX(916)464-4645 <br /> http://w"ww.wate.waterboards.ca.gov/centralvalley <br /> 2 June 2006 JUN 5 2006 <br /> ENVIRONMENd HEALTH <br /> Mr. Brian Miller PERMIT/SERVICES <br /> Agrium <br /> P.O. Box 2300 <br /> West Lafayette, IN 47996-2300 rj2oo'l�/4L <br /> ZERO VALENT IRON PILOT TEST, WESTERN FARM SERVICE INC., 1905 <br /> BROADWAY AVENUE, SAN JOAQUIN COUNTY <br /> Western Farm Service has been investigating and monitoring the extent of pollutants in <br /> groundwater emanating from former shallow evaporation ponds that were excavated in <br /> 1995 and capped in 1996. The predominant pollutants are 1,2,3-trichloropropane <br /> (1,2,3-TCP), 1,2-dichloropropane (1,2-DCP), nitrate, ammonium, dibromochloropro- <br /> pane (DBCP), and ethylene dibromide (EDB). The pollutants are found in the greatest <br /> concentrations in the first encountered water-bearing zone (A-zone), about 60 feet <br /> below ground surface (bgs), downgradient of the former ponds. Pollutants are also <br /> found in lesser concentrations in the second water-bearing zone, which is about 100 <br /> feet bgs. <br /> Western Farm Service proposes to conduct a pilot study evaluating zero valent iron to <br /> treat these pollutants in situ. This proposal is described in Western Farm Service's <br /> 21 July 2005 Zero Valent Iron Pilot Test Work Plan (Pilot Test Work Plan) prepared by <br /> its consultant, GeoSyntec Consultants. GeoSyntec also provided two supplemental <br /> submittals: an 8 March 2006 Memorandum describing EHCTM, the product containing <br /> the zero valent iron; and a revised proposed injection area in the 25 April 2006 Semi- <br /> Annual Monitoring Report. Regional Water Board staff review and comment on the <br /> Work Plan and supplements below. <br /> Bench-Scale Test Results <br /> Western Farm Service has been exploring groundwater treatment technologies for this <br /> site, and in late 2004 enlisted Sirem Laboratories to conduct a bench-scale treatability <br /> study to test the insitu degradation potential of several groundwater treatments. The <br /> treatability study results were reported in the 18 March 2005 Results of Treatability <br /> Study prepared by GeoSyntec Consultants. In the study, microcosms prepared with <br /> site groundwater obtained from one of the most polluted monitoring wells were treated <br /> with one of the following: chitin, Hydrogen Releasing Compound® (HRC), a slow- <br /> release emulsified vegetable oil (EOS), EOS plus KB-1 (a micro-organism capable of <br /> dechlorinating compounds), zero valent iron, untreated and sterile controls. Within the <br /> four-month study period all of the carbon-containing amendments began degrading <br /> nitrate and sulfate before the period was over, and appeared to begin degrading the <br /> chlorinated compounds at the end of the period. Some degradation of ammonium was <br /> California Environmental Protection Agency <br /> �a Recycled Paper . <br />