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Page 2 <br /> ` 2085 Fremont Street <br /> April 1 , 2009 <br /> 3. Infusion of ozone should be done at low pressures that will not result in transport <br /> of the plume. <br /> 4. Conducting regular monitoring for hexavalent chromium both in the treatment <br /> area and downgradient of the treatment area , and a proposal to adjust injection <br /> rates if needed to slow the formation of hexavalent chromium if it occurs. <br /> 5 . A contingency plan for remediation of the hexavalent chromium if monitoring <br /> indicates it is not naturally attenuating at an acceptable rate. <br /> The work plan is due for submittal to the EHD no later than May 29, 2009. <br /> If you have any questions please call Lori Duncan at (209) 468-0337. <br /> Sincerely, <br /> Lori Duncan , REHS Margaret Lagorio, REHS <br /> Registered Environmental Health Specialist Program Coordinator <br /> c: James Barton , CVRWQCB, 11020 Sun Center Drive #200, Rancho Cordova, CA 95670 <br /> Todd Hafner, ATC, 1117 Lone Palm Avenue , Suite B, Modesto, CA 95351 <br />