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E <br /> JEANNE HOMSEY <br /> E PAGE 2 <br /> E r <br /> The results of this exercise will determine whether actual changes made to the system will provide an <br /> added benefit for the cost. <br /> In addition, thick plastic should be placed over the backfilled former tank pit area to aid in prohibiting <br /> air flow through this area into the subsurface. i <br /> When air data (from wells from a remediation system shown to be efficiently designed) indicate the <br /> continued operation of the system would yield no additional benefit, confirmation borings should be <br /> installed. Sufficient soil sample points should be used so that a mass balance calculation can be <br /> performed on residual soil contamination, if any. Should the mass of residual hydrocarbons appear to <br /> be significant, some degree of fate and transport modeling may be required. The groundwater quality <br /> data being collected at this time should support any predictions made from models. <br /> Please provide the above noted submittal to PHS/EHD by September 4, 1995. If you have any <br /> questions or wish to discuss this letter in more detail, please contact Linda Turkatte, Senior REHS, at <br /> I. (209) 468-3441. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> jj <br /> Linda Turkatte, Senior REHS Diane M. Hinson, REHS <br /> Site Mitigation Unit Supervisor <br /> ENCLOSURE <br /> C' CVRWQCB, Beth Thayer <br /> c: SWRCB Cleanup Fund, George Lockewood <br /> c: Margaret Ekholm <br /> c: David Wood <br /> c: Neumiller and Beardslee, Brooke Birke <br /> c: Clearwater Group, Jeanna Hudson <br />