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r <br /> 848' Fremont <br /> Page 2 <br /> f 2) A mass-balance calculation should be calculated before and after ORC <br /> application. The decision for closure will be based on the contamination <br /> mass remaining on site. <br /> 3) PHS/EHD will comment on the necessity for additional ORC installation six <br /> months after the initial ORC placement. <br /> If you have any questions, please feel free to contact Jeffrey Wong at (209) 468- <br /> 0335. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Jeffrey Wong , EHS, Trainee MargareQagorio, R S. <br /> LOP/Site Mitigation Unit IV Supervisor <br /> c: RWQCB, Central Valley Region - Mark List <br /> c: Apex Envirotech, Inc. - Thomas E. Ballard <br />