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California <br /> . � Regional V --tter Quality Control Board <br /> Central Valley Region �� <br /> Terry Tarnminen Robert Schneider,Chair <br /> Secretary fpr •_ <br /> Environmental 11020 Sun Center Drive#200 Rancho Cordova,CA 95670-6114 Arnold Schwarzenegger <br /> Protection (916)464-3291•Fax(916)464-4704 Governor <br /> httP://ww%v.swrcb.ca.gov/rwgcb5 EC g t1 ./ I� <br /> 19 February 2004 <br /> FEB 2 3 2004 <br /> Mr. Ray Baglietto and Mr. Frank Razui ENVIRONMENT HEAD I-I <br /> Tuleburg Warehouse PERMIT/SERVICES <br /> 301 S. Aurora Street <br /> Stockton, CA 95203 <br /> INTENDED MODIFICATION TO INTERIM GROUNDWATER TREATMENT SYS <br /> SPEEDY FOODS, 8200 N. HIGHWAY gg, STOCKTON, SAN JOAQUIN COUNTY TEM, <br /> REGIONAL BOARD ORDER NO.R5-2003-004412, <br /> I have reviewed Intended Modification to Interim Groundwater Treatment System(Letter), dated 18 February 2004, <br /> submitted on your behalf by Ground Zero Analysis,Inc. The Letter proposes: <br /> Addition of an air stripper ahead of the granular activated carbon (GAC)treatment units, in order to extend <br /> the Iife of the carbon substrate, <br /> I concur to the recommendation to add the air stripper to enhance the operation of the current GAC treatment <br /> system. The air stripper will result in a cost savings by increasing the GAC treatment system efficiency. It is my <br /> understanding that the plumbing needed to attach the air stripper was installed prior to the GAC system startup, <br /> therefore shutdown of the treatment system is not required to activate the air stripper. <br /> Removal of the 4,800-gallon temporary storage tank, which would allow direct discharge to land under <br /> Regional Board Order No. R5-2003-004412 (General Order), and <br /> I concur with the removal of the 4,800-gallon temporary storage tank, which would allow direct discharge to land <br /> under Regional Board Order No. R5-2003-004412 (General Order). Two months of operation of the GAC <br /> treatment system without breakthrough show that it is now operating as specified. Weekly analysis will continue <br /> until time to breakthrough is established, at which point monthly analysis may begin. <br /> • Installation of additional groundwater extraction wells as necessary to increase the flow from the current <br /> 1.0-1. 5 gallons per minute. <br /> I concur conceptually to increasing the number of extraction wells if the lead agency San Joaquin County <br /> Environmental Health Department agrees to the number and placement of additional extraction wells, and the <br /> installation is cost effective. It is my understanding that Soil Vapor Extraction and Air Sparging are being <br /> considered as a final remedy, so additional information and an evaluation of all remedies in a Corrective Action <br /> Plan is needed to consider and approve additional groundwater extraction wells. <br /> Thank you for your proactive effort to optimize the groundwater treatment system. <br /> California Environmental Protection Agency <br /> 0 Recycled Paper <br />