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r <br /> 19 June 2004 <br /> AGE-NC Project No 95-0232 <br /> Page 31 of 35 <br /> 9 3 2 Monitoring Activities <br /> After Inoculation,the Inoculation wells and ground water monitoring wells should be monitored for <br /> several months by periodic field measurements of organic vapor,carbon dioxide and oxygen Ground <br /> water samples should be collected and analyzed for petroleum hydrocarbons,bacterial populations <br /> and nutrient availability if monitoring Indicates areas of slow remediation, additional inoculations <br /> may be required <br /> 9 3 3 Feasibility <br /> In-situ bioremediation of MTBE-impacted soil in general has a low feasibility Bioremediation <br /> remains a marginal remedial technology for MTBE due to the contaminants low biodegradability <br /> Although biodegradation has not yet been widely tested for treatment of MTBE, it Is known that <br /> ethers, in general, biodegrade poorly <br /> 9 3 4 Duration <br /> Duration (and cost) of in-situ bioremediation are dependent on the volume of soil and water to be <br /> remediated, the number of inoculation and monitoring wells, the average concentrations of <br /> 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 Based upon the above mentioned factors, a duration for successful <br /> in-situ bioremediation cannot be predicted <br /> 9 3 5 Cost <br /> Due to much uncertainty of in-situ bioremediation of MTBE in general, the cost for in-situ <br /> bioremediation is rough, but will depend upon the volume of inoculant required, the number of <br /> remediation wells to be inoculated and the duration of bioremedial activity Generally, the <br /> Implementation cost for in-situ bioremediation will range from 545,004 to $75,000 Furthermore, <br /> weekly and monthly monitoring generally costs between$10,000 and$20,000 annually,soil borings <br /> to monitor bioremediation progress typically averages S 15,000 to $20,000 annually Therefore,the <br /> total cost could reach as much as $40,000 annually for an undetermined duration <br /> • <br /> Advanced GcoEn%aronmcntal,Inc <br />