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i05 May 1997 <br /> AGE-NC Project No 95-0173 <br /> iPage 25 of 29 <br /> several months by periodic field measurements of organic vapors, carbon dioxide and oxygen <br /> Ground water samples should be collected and analyzed for petroleum hydrocarbons, bacterial <br /> populations and nutrient availability If monitoring indicates areas of slow remediation, additional <br /> inoculations may be required <br />' 8 3 4 Feasibility Studies <br /> Results of bioremediation pilot tests at other sites in California indicate that lighter petroleum <br />' hydrocarbons, such as gasoline compounds are more readily biodegraded than longer-chain(heavier) <br /> hydrocarbons, such as diesel fuel compounds Feasibility studies have not been performed at the <br /> subject site <br /> 8 3 5 Duration <br />' Cleanup durations for in-situ bioremediation will vary, depending upon specific site characteristics <br /> Based of the relatively high concentrations of dissolved hydrocarbons at the site, a treatment period <br />' of 24 to 36 is estimated <br />' 8 3 6 Cost <br />' Bioremediation of ground water can be a very cost-effective method of treatment With little on-site <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 /> treatment period, the total cost for in-situ bioremediation at the site would be between $60,000 and <br /> $120,000 <br /> 8 4 NATURAL ATTENUATION <br /> tNatural 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-terra monitoring <br /> • <br /> - Advanced GeoEnwonmental,Inc <br />