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i <br /> 5 2 1 Soil Venting Advantages <br /> 1 System is easily installed and maintained <br /> 2 Vapor emissions are reduced prior to discharge <br /> 3 Moderate installation cost <br /> 4 Small volumes of hydrocarbon impacted soils are displaced reducing the public <br /> exposure to potential health risk <br />' 5 2 2 Soil Venting Disadvantages <br /> 1 It is not very effective in tight, clay formations <br /> 2 Requires periodic monitoring of vapor emissions <br /> I53 In situ Biodegradation <br /> The remedial action of in situ biodegradation involves the installation of water/nutrient inf lltration <br /> Igalleries at the surface that would provide nutrients to native bacteria and enhance microbial <br /> degradation of the gasoline components The advantages and disadvantages of m adu biodegradation <br /> are as follows <br />' 5 3 1 In situ Biodegradation Advantages <br />' 1 Treatment of both the adsorbed and dissolved phases of petroleum hydrocarbons <br /> 2 Decreases the overall length and cost of remediation project <br />' 3 Water is infiltrated back into the subsurface, eliminating or reducing the discharge <br /> of groundwater <br /> 5 3 2 In situ Biodegradation Disadvantages <br /> 1 Moderate to high initial cost to implement system <br /> 2 Moderate operational and maintenance costs <br /> 3 Requires continued monitoring and sampling <br /> l <br /> TOCI434 PAR 1 1 SEAI- <br /> NOWS-002-0 M•y 31 1994 <br />