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4491 Durham Ferry <br /> Page 3 <br /> recovery. The bioslurping methodology utilized the multiphase extraction concept whereby <br /> the extraction tube is placed either for slurping:or vacuum extraction use. Unfortunately <br /> the figure which describes the extraction tubes,position relative to the groundwater depth <br /> was not included. Overall, bioslurpirig produces relatively less waste water and utilizes a <br /> less aggressive approach which mayjeduce'the occurrence of problems associated with <br /> smearing. Enhanced vapor extraction also extracted groundwater entrained with air as <br /> with bioslurping. The groundwater extraction method proposed in the RAP did not seem to <br /> incorporate the concepts which were refere'ced in the supplemental material. <br /> 3' <br /> Please submit by September 15, 1996 an addendum which addresses PHSIEHD <br /> comments. Following receipt7of the addendum a meeting will be scheduled to discuss any <br /> further questions regarding the proposed RAP. <br /> You may contact me at (209)`468-0337 if you.wish to discuss issues raised within this <br /> letter, to further clarify the revisions which are'�required or to schedule a meeting, <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> 's <br /> Mary Meays, Senior REHS Margare Lagorio, RE� <br /> Site Mitigation Unit Supervisor <br /> MM14491 DURH <br /> cc: Elizabeth Thayer, CVRWQCB; <br /> cc: SWRCB-Cleanup f=und Program <br /> cc: Marcus Niebanck, Clearwater <br /> cc: Brook Birkie, Neumiller and Beardslee <br />