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848 Fremont <br /> Page 2 <br />' 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) PHSIEHD 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, RENS, Director <br />' Environmental Health Division <br /> Jeffrey Wong , EHS, Trainee Margaret,-Lagono, REQS <br /> LOP/Site Mitigation Unit IV Supervisor <br /> c RWQCB, Central Valley Region - Mark List <br /> ✓c Apex Envirotech, Inc -Thomas E Ballard <br /> 1 <br /> f <br />