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1 11 February.2003 AGE-NC Project No. 98-0520 Page 18 of 21 7.3.2. Monitoring Activities After inoculation,the inoculation wells and ground water monitoring wells should be monitored for ' several months by periodic field measurements of organic vapor, carbon dioxide, and dissolved oxygen concentration. Ground water samples should be collected and analyzed for petroleum hydrocarbons,bacterial populations and nutrient availability. If monitoring indicates areas of slow . remediation, additional inoculum and/or nutrients may be required. 7.3.3.' Feasibility Studies Feasibility studies have not been performed at the subject site. However,results of bioremediation ' ' pilot tests another sites in California indicate,that lighter petroleum Hydrocarbons,such as gasoline compounds are more readily-biodegraded than longer-chain (heavier.)hydrocarbons, such as diesel fuel compounds. 7.3.4. Duration ' Cleanup durations for in-situ bioremediation will vary,depending upon specific site characteristics. However,an 18 to 36 month treatment period.is commonly achievable.Since dissolved hydrocarbon concentrations at the 'site are moderate to high, a cleanup period of 24 to 36 months may be projected. r 7.3.5. Cost Bioremediation' of ground water can be a very cost-effective method of treatment.With little on-site equipment required beyond the initial inoculation, the cost for in-situ bioremediation.at the site would be between$40,000 and$60,000. However,monitoring will vary depending upon regulatory requirements, which could significantly increase the total cost of the project. . ' Typical costs for monthly monitoring of an in-situ bioremediation system, in addition to standard quarterly sampling;would be approximately $1,500 per month. Based on a one and one-half year treatment period, the total cost for in-situ bioremediation at the site would be between$70,000 and ' $95,000. 1 - . Advanced GeoEnvironmental,Inc.