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06 December 1995 <br /> AGE-NC Project No. 95-0100 <br /> Page 10 of 13 <br /> annual monitoring activities should include the installation of soil borings to collect soil samples to <br /> monitor bacterial populations, nutrient availability and soil remediation progress. If monitoring <br /> — indicates areas of slow remediation, additional inoculations may be required. Other monitoring <br /> requirements may be requested by the regulatory agencies. <br /> 5.2.5. FEASIBILITY STUDIES <br /> During installation of the soil vapor extraction wells, a soil sample was collected for physicochemical <br /> and microbiological analysis. Both the physicochemcial analysis and the microbiological enumeration <br /> of the sample indicated generally favorable conditions for bioremediation and a high percentage of <br /> existing biodegrading microbes. The soil had less than optimal concentration of nitrates, and slightly <br /> more potassium. Based upon the analytical results, it appears that a program of biostitnulation may <br /> be successful at the Franklyn Cole site. <br /> 5.2.6. DURATION <br /> Duration(and cost)are dependent on the volume of soil to be remediated, the number of inoculation <br /> wells and inoculation events, the chemical composition and concentrations of contaminants, <br /> concentrations of nutrients, soil temperature, and porosity and permeability of the soil. "Theoretically, <br /> the radius of influence of the inoculation wells should increase rapidly at. first, then gradually decline <br /> as the affected volume increases and the bacteria encounter decreasing hydrocarbon concentrations <br /> toward the margins of the contaminant plume. We estimate that in-situ bioremediation of the <br /> Franklyn Cole site would will take between 18 and 24 months. <br /> 5.2.7 COST <br /> The cost for in-situ bioremediation will vary, depending upon the volume of inoculant required and <br /> the number of remediation wells to be inoculated. The cost for in-.situ bioremediation at the Franklyn <br /> — Cole property would likely range from $25,000 to $40,000, including installation of a blower system <br /> (for oxygen). The combined weekly and monthly monitoring costs are generally between $10,000 <br /> _ and $20,000 annually. Soil probes to monitor bioremediation progress typically average $5,000 to <br /> $10,000 annually. Based upon a single inoculation event and a 24-month remediation period, the <br /> estimated total cost for bioremediation of soil at the subject site will be between $50,000 and <br /> $100,000. <br />