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30 January 2014 <br /> AGE Project No. 99-0682 <br /> Page 20 of 28 <br /> 11 . 3 . 1 . Application and Reaction <br /> Application can consist of both temporary (borings) and repeatable (wells) injection points . <br /> The diluted peroxide mixture produces minimal heat and can be performed for several <br /> additional events , especially when dedicated injection wells have been installed . <br /> 11 . 3.2 . Monitoring Activities <br /> After injection , groundwater samples should be collected and analyzed from the site on a <br /> periodic basis to monitor the effectiveness and progress of the ISCO injections . If <br /> monitoring indicates areas of slow remediation , additional injections may be required . <br /> 11 . 3 . 3 . Feasibility <br /> Based on the results of the recent pilot study (Section 9 . 0 .) using solutions of diluted <br /> peroxide proved highly effective at lowvolumes in reducing concentrations in groundwater <br /> and releasing contaminants adsorbed to soil . Further, based on the lateral and vertical <br /> distribution of contaminants in soil and groundwater, ISCO treatment appears to be the <br /> most cost-effective and feasible remedial option for the site . <br /> 11 . 3.4. Duration <br /> Duration (and cost) of ISCO is dependent on the volume of water to be remediated , the <br /> numberof injection points/wells , the average concentrations of contaminants , groundwater <br /> gradient, and the permeability of soil . Shorter-chain hydrocarbons are typically consumed <br /> first and longer-chain hydrocarbons later. Remediation at sites with similar soil <br /> compositions and hydrocarbon-impact typically takes between 3 and 12 months . <br /> 11 . 3. 5 . Estimated Cost <br /> Costs for performance of ISCO remediation typically ranges from $50 , 000 to $ 100, 000 , <br /> depending on the area of remediation and the number of dedicated injection wells <br /> necessary to efficiently mitigate the site . <br /> 11 .4. MONITORED NATURAL ATTENUATION <br /> Monitored natural attenuation (MNA) is a useful strategy for low-risk sites with fully <br /> assessed , stable and declining concentration dissolved hydrocarbon plumes. MNAcan be <br /> Advanced GeoEnvironmental, Inc. <br />