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i <br /> I18 February 1997 <br /> • AGE-NC Project No 95-0104 <br /> Page 18 of 22 <br /> CVRWQCB for the injection of nutrients into ground water <br /> Typically, the microbes utilized in bioremediation are aerobic and usually require additional oxygen <br /> to supplement dissolved oxygen concentrations in ground water Generally, several air sparging or <br /> in-well aeration sources are sufficient to provide the necessary oxygen However, in some cases the <br /> addition of hydrogen peroxide is necessary <br /> 7 3 3 MONITORING ACTIVITIES <br /> After inoculation, the inoculation wells andround water monitoring wells should be monitored for <br /> g g <br /> several months by periodic field measurements of organic vapors, carbon dioxide and oxygen Ground <br /> water samples should be collected and analyzed for petroleum hydrocarbons, bacterial populations <br /> and nutrient availability If monitoring indicates areas of slow remediation, additional inoculations <br /> may be required <br /> 7 3 4 FEASIBILITY STUDIES <br /> Results of the bioremediation pilot tests at other sites indicate that lighter petroleum hydrocarbons, <br /> such as gasoline compounds are more readily biodegraded than longer-chain (heavier) hydrocarbons, <br /> such as diesel fuel compounds Feasibility studies have not been performed at the subject site <br /> 7 3 5 DURATION <br /> Cleanup durations for in-situ bioremediation will vary, depending upon specific site characteristics <br /> However, because of the relatively low concentrations of dissolved hydrocarbons at the site, a <br /> treatment period of 18 months should be achievable <br /> 7 3 6 COST <br /> I Bioremediation ofround water can be a very cost-effective method of treatment With little on-site <br /> g <br /> equipment required beyond the initial inoculation, the cost for in-situ bioremediation at the site would <br /> be between $25,000 and $65,000 However, monitoring will vary depending upon regulatory <br /> 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 an I8-month treatment <br /> period, the total cost for ria-situ bioremediation at the site would be between $50,000 and $90,000 00 <br /> G7,0C)o -�',oon.- <br /> -�- Yy l� M,9AkAP1%kt- <br />