Laserfiche WebLink
California Regional Water Quality Control Board <br /> Central Valley Region <br /> Robert Schneider,Chair <br /> Sacramento Main Office <br /> 11020 Sun Center Drive#200,Rancho Cordova,California 95670-6114 <br /> Phone(916)464-3291•FAX(916)4644645 <br /> http://www.mterboards.ca.gov/centralvalley <br /> APPROVED <br /> 8 July 2005 Author <br /> Senior <br /> Mr. Robert Garcia <br /> Leprino Foods, Inc. <br /> 1830 West 38a'Avenue <br /> Denver, CO 80217 <br /> INTERIM GROUNDWATER CLEANUP PLAN,LEPRINO FOODS COMPANY, TRACY,SAN <br /> JOAQUINCOUNTY <br /> Staff of the Central Valley Regional Water Quality Control Board (Regional Board)has reviewed the <br /> 2 March 2005 Groundwater Cleanup Plan, Leprino Foods Company Plant, Tracy, California(Cleanup <br /> Plan) submitted on your behalf by Geotrans, Inc. for the groundwater diesel fuel pollution(TPHd) <br /> emanating from the Leprino Foods Company(Leprino)plant in Tracy. Leprino has operated a <br /> groundwater extraction and treatment system since 22 May 1996 to recover separate phase <br /> hydrocarbons(SPH) and establish gradient control over the TPHd plume,however, SPH persist in the <br /> source area. Also,the furthest downgradient monitoring well, MW-19, contained 420 ug/1 TPHd in the <br /> 4th quarter 2004 sampling event. Leprino submitted the Cleanup Plan in response to our 31 December <br /> 2004 letter requesting that Leprino submit a final cleanup plan that addresses both the source area and <br /> the downgradient plume and define the steps they intend to take to bring this project to closure. Further <br /> clarification of the Cleanup Plan was provided on 5 July 2005 in a telephone conversation with Brendan <br /> Shine of Geotrans. <br /> The Cleanup Plan recommends five phases of additional work: <br /> 1. Limited additional site characterization consisting of a Geoprobe® or equivalent survey in the <br /> source area to determine the areas of maximum remaining SPH and petroleum-saturated soil. This <br /> information will be used to determine the locations of additional SPH recovery points. <br /> 2. Installation of a second groundwater extraction well to serve as a backup to existing extraction well <br /> EW-2 and to recover product. <br /> 3. Existing monitoring wells MW-3 and MW-4 in the SPH area will be equipped with product recovery <br /> pumps. Existing groundwater extraction well RW-5A, which is in the source area but has small <br /> groundwater production, will be evaluated for a product recovery pump. Two new wells will be <br /> installed in the central area near the groundwater extraction wells to document the cone of depression, <br /> and will be equipped with product recovery pumps to enhance SPH recovery. <br /> 4. After recovery of the bulk of the SPH, Leprino will evaluate soil venting and other bioremediation <br /> techniques to mitigate remaining TPHd in the soil and groundwater. Because SPH recovery may take <br /> California Environmental Protection Agency <br /> Recycled Paper <br />