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t . <br /> ` s <br />'' .. 29"April 2005 <br /> '�. AGE-NC Project-No. 98=0440 <br />' Page 16 of 18 ; <br /> 7.2.3.- Feasibility Studies <br /> Feasibility studies have not been performed at the site.However,results of bioremediation pilot tests <br /> a#other sites in California indicate'that lighter petroieurri hydrocarbons,such as gasoline;compounds <br />' are more readily biodegraded than' longer-chain (heavier) hydrocarbons, 'such as. diesel fuel <br /> compounds: <br /> 7•24. ,Duration <br />' Cleanup durations for in-situ bioremediation will vary,,depetiding upon specific site characteristics. . ; <br /> However,an 18-to 36 month treatment period is cotnmonly achievable. Since dissolved hydrocarbon <br /> concentrations at the site are moderate to high, a cleanup period-of 24 to 36 months may be <br /> projected: <br /> 7.2.5. Cost <br /> Bioremediation of ground water can be a very cost-effective method of treatment. With little on-site <br />' equipment re uired beyond the initial inoculation, the cost for in-situ bioremediation at the site <br /> q Y . <br /> would be between$40,000'and$60000. However,monitoring will vary,depending upon regulatory <br />' requirements', which could significantly inerease 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 per month. Based on a one and one-half year <br /> treatment period,the total cost for in-situ bioremediation at the site would be between$70,000 and <br /> $95;000. s ' <br /> 7.3. MONITORED NATURAL ATTENUATION <br /> Natural 'attenuation,'of passive bioremediation, is a'.remedial ,alternative that- relies on natural <br /> processes to degrade hydrocarbons, dissolved hydrocarbons are dispersed to levels below cleanup <br /> levels or adsorbed to 'soil particals with strong electronic bonds. Biodegradation is the most <br /> important.natural attenuation mechanism. No additional bacteria or nutrieints are added to,the soil <br /> or ground water. Essential nutrients required for biodegradation are commonly naturally present in <br /> the subsurface. However, where high concentrations of hydrocarbons are present;nutrients may be <br /> consumed before hydrocarbon remediation.is complete. <br /> Advanced GmEnvironmental,Inc. <br />