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07 November 2004 <br /> AGE-NC Project No 96-0232 <br /> Page 9 of 11 <br /> compounds <br /> Due to the (1) uncertainties of implementing bioremediation/bioenhancement at this site, (2) <br /> questionable rate of MTBE removal, and (3) based on AGE's experience utilizing bioremediation <br /> technology to clean-up similar gasoline/MTBE-impacted sites, bioremediation should have a low <br /> to moderate feasibility <br /> 4 3 4 Duration <br /> Duration (and cost) of in-situ bioremediation are dependent on the volume of soil and/or water to <br /> be 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, an estimated duration of <br /> 36 to 48 months is estimated for successful in-situ bioremediation <br /> 4 3 5 Estimated Cost <br /> Due to the low number of hydrocarbon-degrading organisms at the site, the cost for in-situ <br /> bioremediation is uncertain and will depend upon the amount of moculant required and the duration <br /> of bioremedial activity With little on-site equipment required beyond the initial inoculation,the cost <br /> for in-situ bioremediation at the site could range between $25,000 and $65,000 However, <br /> monitoring costs will vary depending upon regulatory requirements, which could significantly <br /> increase the total cost of the project Typical costs for monthly monitoring of an in-situ <br /> bioremediation system, in addition to standard quarterly sampling,would be approximately$1,500 <br /> per month Based on a 24 to 36 month treatment period, the cost for monthly monitoring and <br /> quarterly sampling events could range between $36,000 and $54,000 Therefore, the total cost for <br /> in-situ bioremediation at the site could range between $61,000 and $119,000 <br /> 4 4 NATURAL ATTENUATION <br /> Natural attenuation, or passive bioremediation, is a remedial alternative that relies on natural <br /> processes to degrade hydrocarbons Natural attenuation is an"inactive"remediation method and does <br /> require a high degree of site characterization and long-tern monitoring <br /> Advanced GeoEnvironmental,Inc <br />