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� s <br /> Mr. Kenneth Earnest Page 2 <br /> In future monitoring reports please include an iso-concentration <br /> map for TPH-G. Current concentrations of TPH-G indicate that a <br /> "zero-line" has not been determined for the southwest quadrant <br /> and this evaluation is required prior to establishing <br /> "containment zones" as policy re-evaluations are suggesting. <br /> After adequate data from the groundwater conditions not affected <br /> from water extraction are received_ and evaluated, PHS-EHD will <br /> notify you of any decisions . <br /> Current closure requirements for site certification require sites <br /> to adhere to Corrective Action Requirements of the California <br /> Code of Regulations, Underground Tank Regulations (CCR, Title 23 , . <br /> Chapter 16, Section 2720 et seq) . Requests for closure will be <br /> evaluated based upon this requirement . <br /> You may direct any questions you may have to Michael Infurna at <br /> (209) 468-3454 . <br /> Donna Heran, RENS, Director <br /> Environmental He th Division <br /> Michael Infurna, Senior REHS Diane M. Hinson, REHS <br /> Site Mitigation Unit Supervisor <br /> MI <br /> c : Gary Barker —Horizon Environmental, 5011 Golden Foothill <br /> Pkwy, Suite 7, El Dorado ;Hills, CA 95762 <br />