Laserfiche WebLink
-a ra E".' <br /> w _ s <br /> Woodward-Clyde Corisctllar!is <br /> �~ Table 7 Continued <br /> Technology Description Advantages Disadvantages <br /> In Situ enhanced Enhancement of Technology with a Difficulties in <br /> BiQdagradalion hydrocarbon degrading limited track record. delivering oxygen, <br /> activities of naturally Minimizes disruption of nutrients, pH-adjusting <br /> occurring microflora ongoing site operations, chemicals; and ensuring <br /> through the addition of When used in even distribution, <br /> oxygen and nutrients, conjunction with air Channelling may result <br /> and adjusting of the stripping could in nonhomogeneity of <br /> environment. accelerate remediation treatment. Treatment <br /> at the Caltrans Shop 10 rate wEl be slow when <br /> facility, hydraulic conductivity <br /> is slow. It is difficult to <br /> control or monitor the <br /> process. Inefficient in <br /> areas of high <br /> contaminant <br /> concentrations. May be <br /> applicable to assist in <br /> remediation of soils a! <br /> Shop 10, <br /> Vapor Extraction Removal of volatile Proven technololgy if limited to organics <br /> IVES) organic compounds treatment is not which are volatile at <br /> (VOCs) by application required. Treatment ambient conditions. <br /> of a vacuum to a system rate can be fast for Nonhomogeneity of <br /> of extraction wells. volatile components. Subsurface may lead to <br /> Extracted VOCs can be Treatment may enhance channelling and uneven <br /> vented,adsorl ;d on Insitu biodegradation of treatment. Delaileo <br /> carbon, incirorated, or organic contaminated knowledge,of subsurface <br /> catalytically oxidized. soils is needed.May be <br /> applicable to <br /> contaminated soils at <br /> Shop 10. <br /> In Silu Steam/Air Use of hot air and steam Thorough mixing and Has only !imiled field <br /> Stripping delivered through homogenization of soil. experience. Does not <br /> drilling assembly. Results in good work well in fine- <br /> Vaporized organics are treatment in coarse- grained soils such as <br /> condensed and grained soils. Closed- those at Callrans Shop <br /> recovered. Not air is loop operation. On-line 10. Cannot use high <br /> compressed and monitoring of treatment pressure. <br /> recycled. rate Is possible. <br /> 21 <br />