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10 June 1999 <br /> . AGE-NC Protect No 97-0290 <br /> IPage 23 of 26 <br /> 8 3 6 Cost <br /> Bioremediation ofound water can be a very cost-effective method of treatment With little on-site <br /> �' rY <br /> equipment required beyond the initial inoculation, the cost for in-situ bioremediation at the site <br /> would be between $25,000 and $65,000 However, monitoring costs will vary depending upon <br /> regulatory requirements, which could significantly increase the total cost of the project <br /> Typical costs for monthly monitoring of an in-situ bioremediation system, in addition to standard <br /> quarterly sampling, would be approximately $1,500 00 per month Based on a 24 to 36 month <br /> I treatment period, the total cost for in-situ bioremediation at the site would be between $70,000 and <br /> $120,000 <br /> I8 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 not an"inactive"remediation method and <br /> does require specific characterization and long-term monitoring <br />' 8 4 1 Principles <br /> As with natural attenuation in soil, biodegradation is the most important natural attenuation <br />' mechamsin for impacted ground water No additional bacteria or nutrients are added to the ground <br /> water Essential nutrients required for biodegradation are commonly present in the saturated zone <br /> However,where high concentrations of hydrocarbons are present, nutrients may be consumed before <br />' hydrocarbon remediation is complete Oxygen depletion in ground water is another characteristic <br /> of passive biodegradation Natural attenuation is normally used where low concentrations of <br /> hydrocarbons are present or following completion of another method of remediation <br /> I <br />' 8 4 2 Duration <br /> The duration for natural attenuation can be many years Costs for natural attenuation are generally <br />' lower than most active remediation options However, costs can be highly variable depending on the <br /> duration and type of monitoring required Fate and Transport modeling may be used to demonstrate <br /> the potential for hydrocarbons to impact nearby ground water receptors <br /> I <br /> I <br /> Advanced GeoEnviranmental,Inc <br />