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Mr Michael Infurna Project 0805-114 02 <br /> January 29, 1996 <br /> Page 3 <br /> stockpiled soil is based on the concentration of petroleum hydrocarbons in the <br /> excavated soil <br /> Soil Vapor Extraction <br /> Based on the results of the site assessment and the operation of the soil vapor extraction <br /> (S VE) system, S VE of gasoline hydrocarbons in soil is feasible This alternative required <br /> the installation of subgrade piping and installation and operation of a vapor extraction and <br /> abatement system This method is less disruptive to business operations and is more cost- <br /> effective than excavation The S VE system is currently extracting and treating <br /> hydrocarbon-laden vapors as designed <br /> GROUNDWATER REMEDIATION <br /> Groundwater remediation is the removal and/or treatment of groundwater impacted by <br /> petroleum hydrocarbons This section discusses alternatives for remediating the <br /> groundwater at the site <br /> Groundwater Extraction and Treatment <br /> Based on analytical data collected from groundwater to date, dissolved gasoline hydrocarbons <br /> quantified as gasoline are present in on-site and off-site wells Implementation of this alternative <br /> may require the installation of one or more recovery wells This option will also require the <br /> designing, permitting, and installation of an aboveground groundwater treatment system Based <br /> on existing concentrations of dissolved hydrocarbons in groundwater and the excessive amount <br /> of water that will be produced to maintain an effective capture zone, EMCON believes this <br /> alternative method is not cost-effective to remediate groundwater In addition, based on <br /> inforrriation gathered at similar sites with operating groundwater extraction test systems, the <br /> remediation process is very slow and target cleanup levels are typically unobtainable <br /> Air Sparging <br /> Air sparging is used as an alternative to conventional groundwater pump and treat and <br /> aboveground treatment. Air sparging is used to provide in-situ air-stripping to physically <br /> remove dissolved hydrocarbons and increase microbial degradation of dissolved <br /> hydrocarbons <br /> SAC\N\PJM80M8051140 2ES-95\pa+ 1 <br />