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The above cost estimates are for the simplest air-sparging application with the lowest costs.these costs j <br /> increase substantially in other situations. For instance,ff soil vapor extraction must be added to the system, <br /> the first year cost more than doubles,to about$175,000.SVE also raises the annual operation, <br /> maintenance and monitoring cost substantially(from$20,000 per year to 570,000). <br /> In some cases, people are using air-sparging to treat the plume and the source. Even if the plume is very <br /> small and the additional area to be sparged is small,the cost of installation escalates by about 50% and <br /> annual operating expenses double to $ 0,000 per year. If SVE must be added to such a system (as most <br /> engineers would probably recommend),first-year installation and operating costs will typically run$200,000 <br /> to $300,000. In the following years'operation, maintenance and monitoring costs will be about$90,000 per <br /> year.The advantage of such a system is that if it is successful,the duration of treatment would be less. <br /> i <br /> C-8 <br />