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10 June 1999 <br /> AGE-NC Protect No 97-0290 <br /> IPage 15 of 26 <br /> 7 3 4 Monitoring Activities <br /> The Inoculation wells and ground water monitoring wells should be monitored for several months <br /> after initial inoculation by collecting periodic field measurements of organic vapor, carbon dioxide, <br /> and oxygen concentrations Quarterly or semi-annual monitoring activities should include the <br /> installation of soil borings to collect soil samples to monitor bacterial populations, nutrient <br /> availability and soil remediation progress If monitoring indicates areas of slow remediation, <br /> additional inoculations may be required <br /> 7 3 5 Duration <br /> Duration (and cost) of in-situ bioremediation are dependent on the volume of soil and water to be <br /> remedlated, the number of inoculation and monitoring wells, the average concentrations of <br /> I contaminants and nutrients, temperature and the permeability of soil Theoretically, the radius of <br /> Influence of the inoculation well should increase rapidly at first, then gradually decline as the <br /> affected volume Increases and the bacteria encounter decreasing hydrocarbon concentrations toward <br /> the margins of the hydrocarbon plume Shorter-chain hydrocarbons are typically consumed first and <br /> longer-chain hydrocarbons later Remediation at sites with similar soil compositions typically takes <br /> between 18 and 36 months <br /> 7 3 6 Feasibility <br /> I Feasibilitytesting for bioremediation have not been performed for the site If bioremediation is to <br /> g <br /> be considered, samples should be analyzed for indigenous bacteria, nutrients and biotoxins <br /> 7 3 7 Estimated Cost For In-Situ Bioremediation <br /> The cost for in-situ bioremediation will vary, depending upon the volume of inoculant required, the <br /> number of remediation wells to be Inoculated and the duration of bloremedlal activity Generally, <br /> the initiation cost for in-situ bioremediation will range from $35,000 to $75,000 Furthermore, <br /> weekly and monthly monitoring generally costs between $10,000 to $20,000 annually, soil probmgs <br /> Ito monitor bioremediation progress typically averages$5,000 to $10,000 annually Total costs range <br /> from $70,000 to $160,000 <br /> I <br /> Advanced GeoEnNironmental,Inc <br /> I <br />