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California Regional Water Quality Control Board <br /> Central Valley Region <br /> Terry Tamminen Robert Schneider. Chair <br /> Secretary for Sacramento Main Office Arnold Schwarzenegger <br /> Environmental Internet Address: http:/h«ti-�v.swrcb.ca.gov/n gcb5 Governor <br /> Protection 11020 Sun Center Drive'1200 Rancho Cordova,CA 95670-6114 <br /> Phone(916)464-3291 <br /> October 13, 2004 <br /> Former Busy Bee Cleaners <br /> c/o Mr. Joseph Salazar, Jr., Attorney at Law <br /> Mayall,Hurley, Knutsen, Smith and Green <br /> 2453 Grand Canal Blvd., Second Floor <br /> Stockton, CA 95207-8253 <br /> WORK PLAN FOR ADDITIONAL GRO UNDWATER CHARACTERIZATION AND SOIL VAPOR <br /> EXTRA CTIONI GRO UNDWATER AIR SPARGE PILOT TESTING; FOR1VIER B US BEE <br /> CLEANERS,SAN JOAO UIN CO UNTY <br /> The California Central Valley Regional Water Quality Control Board (Regional Board) has reviewed <br /> your submittal entitled "Workplan for Additional Groundwater Characterization and Soil Vapor <br /> Extraction/Groundwater Air Sparge Pilot Testing" dated September 2004 and prepared by E2C <br /> Remediation. Regional Board staff comments on the document are provided below. <br /> Backound <br /> In April, 2004, Busy Bee submitted a document entitled"Draft Remedial Investigation Report, <br /> Workplan for Installation of Additional Downgradient Monitoring Well and Workplan for Focused <br /> Feasibility Study". Based on discussions with Regional Board staff on June 3 and August 12, 2004, <br /> Busy Bee decided to hold finalization of the RDFS report until the remaining characterization and <br /> treatability studies have been completed. <br /> In the work plan, Busy Bee proposes to install additional groundwater monitoring wells, perform soil <br /> vapor extraction (SVE) testing and groundwater air sparging(GAS)pilot studies at the Busy Bee site. A <br /> summary of the proposed work follows: <br /> 1. A groundwater monitoring well will be installed approximately 400 feet down gradient (south) of <br /> the southernmost monitoring well. Samples from the southernmost well contained 5.0 µg/1 PCE <br /> in January 2004 and 4.0 4g/1 PCE in May 2004. <br /> 2. A groundwater monitoring well will be installed in a data gap area along the central axis of the <br /> plume (on Main Street between Oak and Pine Streets). <br /> 3. Ten SVE extraction wells and 19-SVE observation wells will be installed. Three separate SVE <br /> pilot systems will be used, one in each of the following three test areas; source area, mid-plume <br /> and downgradient plume areas. <br /> California Environmental Protection Agency <br /> nf% R-rw`1-,1 P—A, <br />