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a <br /> JOHN AND MARGARET MARCI <br /> PAGE 2 <br /> Additional characterization requirements for alternatives utilizing biodegradation include biological <br /> studies to determine the number and type of,''naturally occurring bacteria in the soil, analysis for <br /> intrinsic permeability, pH, and for moisture, nitrogen and phosphorous content. For bioventing, soil <br /> vapor extraction and injection tests should also be performed to determine the site specific radius of <br /> influence and air stream contaminant concentrations. <br /> For passive bioremediation, extensive data must be gathered to show this alternative to be effective <br /> over time. In addition to the long term groundwater monitoring costs, periodic soil borings must be <br /> performed to show biodegradation is in fact occurring at the site. The cost of generating this data over <br /> a potentially extended length of remediation time may make this alternative more costly in the long run. <br /> In addition, to propose to use this alternative, the physical data generated from the feasibility studies <br /> must indicate this alternative to be more effective compared to the other alternatives being considered. <br /> The alternatives noted above are suggestions. All appropriate remedial alternatives should be <br /> considered. <br /> Therefore, based on the above discussion, please submit a workplan to PHS/EHD by April 3, 1995 to <br /> investigate the full extent of the soil contamination at the site. Please include a proposal for feasibility <br /> testing with a time schedule for the implementation and','completion of the work. <br /> If you have any questions or wish to discuss this letter in more detail, please contact Linda Turkatte, <br /> Senior RENS, at (209) 468-3441. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Linda A. Turkatte, Senior REHS Diane M. Hinson, REHS <br /> Site Mitigation Unit Supervisoe <br /> LT <br /> c: CVRWQCB, Beth Thayer <br /> c: W.J. Hunter and Associates, William Hunter <br /> c: J.I.M. Corporation, c/o Theodore Martin <br /> c: Donald and Lois Allen <br /> c: Harry Gebauer <br /> c: G.S. Garrison <br /> i <br /> I� <br />