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Fernando's Place page 2 <br /> 1201 S . Center St, , Stockton <br /> EHD has not received a Site Conceptual Model (SCM ) for this site. In order to <br /> better understand the threat posed by the contaminant mass remaining in the <br /> soil , its potential to further impact the ground water, and how it may be migrating <br /> offsite , EHD will require you to submit a SCM that addresses these concerns . A <br /> technical justification to implement interim remediation must be supplied for EHD <br /> to concur with the proposed interim corrective action . If it can be shown that the <br /> plume is unstable and/or expected to further degrade the ground water in the <br /> area , EHD will approve an interim remedial action to proceed . Otherwise the site <br /> characterization should be completed and a final remediation plan prepared . <br /> Additionally, remedial alternatives are to be evaluated for cost-effectiveness and <br /> feasibility. Based on AGE's understanding of the contaminant mass and the soil <br /> lithology under your site , your consultant should be able to conclude which <br /> remedial alternative is likely to be most cost-effective at this site . Once this <br /> decision has been declared in a Feasibility Study, EHD will allow testing of that <br /> method for purposes of designing the system . <br /> The Plan is inadequate for addressing the vertical delineation requirement as <br /> directed by EHD . The testing of remedial alternatives is not approved without an <br /> evaluation of the cost-effectiveness and a feasibility study. The Plan is not <br /> approved as submitted . <br /> A revision to the Plan is required within 30 days. Please submit a proposal that <br /> includes an onsite vertical investigation . Once the onsite vertical extent of the <br /> petroleum plume has been defined , you may extend your investigation to include <br /> the offsite portion of the plume. <br /> You may direct your submittals and any questions you may have to Michael <br /> Infurna, Senior REHS , at (209) 468-3454. <br /> Donna Heran , REHS , Director <br /> Environmental Health Depa ent <br /> 114V 0 5 lzvae� <br /> Michael J . Infurna Jr. , Senior REHS Nuel Henderson , P. G . <br /> LOP / Site Mitigation Unit IV LOP / Site Mitigation Unit IV <br /> MI/ <br /> c: CVRWQCB — James Barton <br /> c: SWRCB CUF — Mark Owens <br /> c: AGE — Anna Behrens , 837 Shaw Rd . Stockton 95215 <br />