Laserfiche WebLink
California Ronal Water Quality Antrol Board@ <br /> Terry Tamminen Central Valley Region <br /> secretaryfor a <br /> Arnold Schwaene er <br /> Environmental Robert Schneider,Chair Governor BB <br /> Protection 11020 Sun Center Drive#200,Rancho Cordova,California 95670-6114 <br /> (916)464-3291 •Fax(916)4644797 <br /> http://www.svrtcb.ca.gov/rwgcb5 _ M <br /> 29 January 2004 <br /> FEB 0 2 2004 <br /> Mr. Robert Garcia ENVIRONMENT HEALTH <br /> Leprino Foods, Inc. PERMIT/SERVICES <br /> 1830 West 38t11 Avenue <br /> Denver, CO 80217 <br /> PROPOSED REMEDIA TION SYSTEM ENHANCEMENTS, LEPRINO FOODS COMPANY, <br /> TRACY, SAN JOA Q UIN CO UNTY <br /> Staff of the Central Valley Regional Water Quality Control Board (Regional Board)has reviewed the <br /> 22 September 2003 Proposed Remediation System Enhancements and Recommended Modifications to <br /> Monitoring and Reporting Program (Proposal), submitted on your behalf by Geotrans, hic. for the <br /> groundwater diesel fuel pollution(TPHd) emanating from the Leprino Foods Company(LFC)plant in <br /> Tracy. The Proposal contains proposed enhancements to the existing groundwater remediation system, <br /> proposes a pathway to closure, and proposes changes to the Monitoring and Reporting Program (MRP). <br /> The existing system consists of a groundwater extraction and treatment system (GWETS)to establish <br /> gradient control on the TPHd plume and extract separate phase hydrocarbons (SPH) from the <br /> groundwater. The extracted SPH is skimmed from an oil-water separator, and the extracted groundwater <br /> is treated in the LFC water treatment system. <br /> Remediation Enhancements <br /> LFC proposes enhancing the remediation system by using oxygen injection. Although the Proposal is <br /> not called a feasibility study, LFC states that it evaluated other technologies including biosparging with <br /> air, air sparging with soil vapor extraction, and dual-phase extraction. LFC selected oxygen injection <br /> because it uses pure oxygen and can be delivered to the groundwater at a low delivery rate, as opposed to <br /> air sparging which could result in hydrocarbon vapors accumulating within the food processing plant. <br /> The Proposal states that the oxygen injection would be installed in two phases. In Phase 1, <br /> downgradient oxygen injection points would be installed near the property boundary to treat any TPHd <br /> leaving the site. The GWETS would continue to operate to maintain hydraulic control of the source <br /> area. LFC proposes to install two injection points upgradient of existing monitoring wells RW-1 and <br /> RW-2, which both contain TPHd. Two additional monitoring points are proposed between RW-2 and <br /> the upgradient injection point. The proposed monitoring points are intended to provide data that could <br /> be used to evaluate the effectiveness of the technique, determine the necessary spacing of injection <br /> points and delivery rate, and provide data for planning Phase 2. <br /> California Environmental Protection Agency <br /> Oftecycled Paper <br />