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_y <br /> Jeffrey Brown Page 2 <br /> 1. Quarterly groundwater monitoring must be instituted immediately, and <br /> reports sent both to the CVRWQCB and PHS/EHD. <br /> I <br /> 2. The extent of soil contamination must be fully defined. A mass balance <br /> of the residual soil contamination shall be calculated. A feasibility study <br /> of remedial technologies should be completed. Methodologies to be <br /> evaluated should include natural attenuation as well as active remedial <br /> technologies. <br /> 1 <br /> 3. The extent of the groundwater plume must be fully defined. A mass <br /> balance of the groundwater plume shall be calculated. A feasibility <br /> study of remedial technologies should be completed. Methodologies to <br /> / be evaluated should include natural attenuation as well as active <br /> remedial technologies. <br /> 4. A risk assessment evaluating impacts to receptors and the environment <br /> as well as fate and transport modeling should be completed as part of <br /> the feasibility study. <br /> I <br /> The data resulting from completion of these requirements will allow for the <br /> determination of the need to remediate the site, and if applicable, what cleanup levels <br /> will be protective of the resource, for the highest beneficial use of the aquifer in the <br /> area surrounding the Safeway site. <br /> If you have any questions, please contact Steven Sasson at (209) 468-3459. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> I <br /> Steven Sasson, Senior REHS Margar Lagorio, REHS <br /> Site Mitigation Unit Supervisor <br /> SS <br /> c: CVRWQCB, Central Valley Region - Elizabeth Thayer <br /> I <br /> c: CVRWQCB, Central Valley Region - James Brathovde <br /> c: SWRCB - Mel Jacobo <br /> c: Dennis Miller <br /> c: TRC Committee Members <br /> enclosure <br /> I <br />