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California Regional Water <br /> g Quality Control Board <br /> Central Valley Region <br /> V&cn H Hickox Robert Schneider,Chair (a <br /> retary for Gray Davis <br /> Environmental Sacramento Main Office Governor <br /> Protection Internet Address http//ww4v swrcb ca gov/rwgcb5 <br /> 3443 Routier Road,Suite A,Sacramento,California 95827-3003 <br /> Phone(916)255-3000•FAX(916)255-30I5 <br /> 13 May 2002 <br /> Durhim Ali Juban Nags Saleh-Ah Mohamed & Huda Gubary <br /> 667 O'Farrell Street #10 PO Box 1322 25 Poncetta Drive #201 <br /> San Francisco, CA 94109 Riverbank, CA 95367 Daly City, CA 94015 <br /> WORK PLAN FOR REMEDL4L APPROACHAND WELL INSTALLATIONREVIEW <br /> RANCHMARKET, 23569 SOUTHSANTA FE ROAD, RIVERBANK, SANJOAQUIN COUNTY <br /> Board staff reviewed the 2 May 2002 Work Plan for Remedial Approach and Well Installation <br /> (Workplan) submitted on your behalf by Secor International Incorporated (Secor) The Workplan <br /> presents detailed plans for Installation of the approved soil vapor extraction (SVE) and ozone sparging <br /> systems at the subject site Board staff approved the aforementioned SVE and ozone sparging systems in <br /> our 26 March 2001 letter review of Secor's 28 February 2001 Final Remediation Plan (FRP), which <br /> Included Installing four SVE wells and twelve ozone sparg6 wells, connecting the wells to a remedial <br /> compound, and starting up the remedial systems The difference from the approved FRP to the current <br /> is that Secor proposes to Install eleven additional ozone sparge wells for a total of 23 ozone <br /> .Workplan <br /> arge wells <br /> The Workplan is approved with the following comments and additions <br /> 1 Of the eleven additionally recommended ozone sparge wells, five wells are proposed to be Installed <br /> on-site, and six wells are proposed to be installed off-site Ozone wells 16, 17, and 18 are outside <br /> the known soil and groundwater contaminated areas, and no data has been submitted to support <br /> remedial efforts in this area Therefore ozone wells number 16 17 and 18 are nota roved <br /> 2 Site cleanup levels were not presented in the FRP, and Secor stated in the Workplan that "site <br /> clean-up goals may eventually be determined by risk based corrective action assessment" Thus <br /> determination of cleanu oals is nota ro nate Groundwater In the immediate area of the site is <br /> used for domestic water supply, therefore, at a minimum, the groundwater in this area shall not <br /> contain concentrations of chemical constituents in excess of the maximum contaminant levels <br /> (MCLS) specified in the August 2000 A Compilation of Water Quality Goals A Compilation of <br /> Water Quality Goals is available on the California Regional Water Quality Control Board, Central <br /> Valley Region website at http //www swrcb ca gov/rwacbS/available_documents/wogoals/ <br /> 3 Secor stated in the Workplan, "The remediation system will be operated until cleanup goals are <br /> achieved or until such a time as the remediation effort is shown to no longer be technically or <br /> economically feasible such as when groundwater concentrations reach asymptotic levels " Board <br /> 4Dstaff do not concur with this determination of s tem shut down Once the SVE and ozone sparging <br /> California Environmental Protection Agency T,E 9 <br /> rd-Recycled Paper 2 <br /> The energy challenge facing Cahfomia is real Every califomtan needs to take immediate action to reduce energy c ippon <br /> For a list of simple ways you can reduce demand and cut your energy costs,see our Web-site at http.//www swrcb ca gov/rwgcb5 <br />