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California Regional Water Qualitytgpj�E5,9A,BoardlliI <br /> :- <br /> HEAL <br /> Central Valley Region ar.!t!r SERVICE <br /> r Robert Schneider,Chair 132 <br /> ��T „ ,_ Gray Davis <br /> P-H.Hicko2 h ^t� ,G J! Governor <br /> Lary for Sacramento Main oirice <br /> 'inmental Internet Address: http://www.swrcb.ca.gov/rwgcb5 <br /> 'rotection 3443 Routier Road,Suite A,Sacramento,California 95827-3003 <br /> Phone(916)255-3000•FAX(916)255-3015 <br /> 1.. <br /> 10 October 2003 <br /> 1 <br /> Ms.Nancy Bishop <br /> Western Farm Service <br /> 3650 Mt. Dia-blo-fflvd.,­S_Uife 230 <br /> `Lafayette, CA 94549 <br /> PARTIAL APPROVAL OF SOIL REMEDIAL ACTION PLAN, WESTERN FARM SERVICE, <br /> `VERNALIS, SAN JOA QUIN COUNTY <br /> We have reviewed the 25 August 2003 Soil Remedial Action Plan (Cleanup Plan) prepared on your <br /> `behalf by GeoSyntec Consultants for the former tank farm at the Western Farm Service facility in <br /> Vernalis (WFS). Soil beneath the former tank farm contains elevated concentrations of ammonium and <br /> nitrate as characterized in various investigations conducted in 1989, 1991, and 1996, concluding with the <br /> removal of the upper one foot of soil in about 1997. The RAP proposes to explore the potential of insitu <br /> biological degradation of ammonium and nitrate in soil through the following actions: <br /> • Conduct a microcosm study in the laboratory using soil obtained from the former tank farm to <br /> evaluate the efficacy of HRC Primer(a soil-specific formulation of Hydrogen Releasing <br /> Compound(D)to degrade ammonium and nitrogen. In addition to a microcosm amended with HRC <br /> Primer, a microcosm will be amended with unsulfured molasses, and one will be an intrinsic control, <br /> all maintained under anoxic conditions. Each microcosm will consist of at least three replicates, and <br /> will be sampled about every other week for nitrogen and carbon compounds in soil and for nitrogen <br /> and other gases in the headspace. <br /> • Submit microcosm test results, evaluation and conclusions to Regional Board staff <br /> • Inject HRC Primer on approximately 10-foot centers throughout the approximately 150 x 50-foot <br /> former tank farm area to depths of two feet below ground surface (bgs) and about 17 feet bgs,which <br /> is at least five feet above seasonally high groundwater depth. <br /> Obtain depth discrete soil samples annually. <br /> Regional Board staff concur with WFS's microcosm study approach to developing an insitu remedial <br /> strategy for soil that contains high ammonium and nitrate concentrations. At this juncture,however,it is <br /> premature to formulate an implementation plan prior to obtaining the microcosm results. <br /> We concur with the microcosm study portion of the Cleanup Plan providing the following addition is <br /> made to the microcosm setup: if substantial ammonium degradation is not realized in either of the two <br /> California Environmental Protection Agency <br /> Qd Recycled Paper <br /> you energy <br /> lenge acing California <br /> is re cos Every <br /> ourf Orman to needs <br /> to take iimmediate <br /> s edia eaction o reduce energy consumption. For a list of simple ways <br />