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i <br /> Closure Report 34 <br /> Golden Grain Manteca Bean Facility,299 Moffat Boulevard,Manteca,California July 16,1996 <br /> ' ■ local groundwater uses <br /> ■ concentrations remaining <br /> ' cost of remediation <br /> The following portions of this section summarize and show that Golden Grain has met the above <br /> ' requirements for site closure This information is organized to facilitate agency review of this request <br /> for site closure with no further action status This is also done through a cross reference listing of <br /> ' where the Appendix B,Tri-Regional Recommendations Checklist of Required Data for Closure of <br /> UST Site items have been addressed within this report(refer to appendix A) <br /> 7 2.1 Extent and Stability of Plume <br /> Golden Grain has addressed the extent of impacted sod and groundwater and evaluated the stability <br /> of the plume by the following methods <br /> ' a Identifying the source and assessing the extent of the problem at the site This was done <br /> by removing the UST at the site and completing an environmental assessment of the site <br /> The assessment included complete delineation of hydrocarbons in soil and groundwater <br /> at the site as well as a geologic and hydrogeologic assessment of the site subsurface <br /> ■ Addressing the source problem by removing free-phase hydrocarbons originally present <br /> and remediating the impacted soil and groundwater This remediation was done following <br /> an extensive feasibility study and research to identify the best available remedial <br /> technology The result of the feasibility study was an agency approved plan for the <br /> ' remediation Remediation activities have included implementation of soil vapor and <br /> groundwater extraction and treatment The current status of the remediation system <br /> indicates that asymptotic levels have been reached in both soil and groundwater In other <br /> twords, no additional hydrocarbons can be removed from the subsurface <br /> ■ Monitoring and sampling the wells at the site on a quarterly basis to verify that the <br /> hydrocarbon plume has not migrated off the site <br /> ■ Maintaining hydraulic and soil vapor control by operation of the remediation system <br /> ' a Using a fate and transport model to evaluate the stability of the plume and disposition of <br /> groundwater containing hydrocarbons overtime The model for the site indicates the <br /> current plume will not migrate off the site, and in fact, using conservative assumptions, <br /> ' will degrade to nondetectable levels in less than 10 years <br /> 1 <br /> • <br /> 1 42020213.CR <br /> FLUOR DANIEL GTI <br />