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1 <br /> of TPH and BTEX will be conducted In addition, groundwater and soil <br /> sampling will be performed to assure required hydrocarbon Ievels have <br /> been achieved <br />' 3 3 Soil Excavation and Remediation <br /> Subsequent to the removal of the former fuel storage tanks, soil sampling <br /> results indicated that certain areas in the tank pits still contained soil with <br /> elevated hydrocarbon concentrations Prior to beginning soil remediation, <br /> additional soil will be removed from the tank pits These soil will be <br /> sampled and analyzed on site using an immuno-assay technique <br /> The excavated soil will be treated for removal and destruction of <br />' petroleum hydrocarbons by a process called Heat Enhanced Vapor <br /> Extraction/Thermal Oxidation (HEVE/TO) To accomplish this process, <br /> soil to be treated is assembled into a treatment pile as illustrated in <br />[ Drawing 2-4 During the construction of the soil treatment pile a network <br /> of air injection and vapor extraction piping will be placed within the soil <br /> pile Hot air injection pipes are 3/4 inch internal diameter steel with 1/8 <br /> inch holes Air extraction pipes are 3 inch internal diameter PVC with 1/8 <br /> inch slots The piping is placed on approximately 6 foot centers, <br /> horizontally and vertically during the pile construction The treatment pile <br /> size is limited to the reach of the excavator such that the pile only <br /> experiences gravity compaction In order to provide for enhanced <br /> biodegradation, inorganic fertilizer is spread on the soil with each lift <br />' After assembly, the treatment pile is covered with plastic sheeting to avoid <br /> fugitive hydrocarbon emissions and rainwater intrusion <br /> In conjunction with the treatment pile construction, the mobile HEVE/TO <br /> treatment system will be transported to the site and necessary installation <br /> activities will be conducted The schematic of the HEVE/TO treatment <br /> system is shown in Drawing 2-3 The entire setup process, including <br /> treatment pile construction, installation of piping network, utilities hook- <br /> up, and HEVE/TO connection and testing is anticipated to take <br />' approximately 5 days <br /> Soil Treatment - The HEVE/TO treatment unit is scheduled to operate <br /> continuously for two to three weeks The schedule may vary depending <br /> on the results of organic vapor analyzer tests on air samples obtained from <br /> the vapor extraction lines and soil pile analytical results obtained <br /> periodically during the treatment process Soil samples collected during <br /> treatment will be for a quantitative immuno-assay test of petroleum <br /> hydrocarbons Based on the results of the above described screening tests, <br /> the HEVE/TO treatment unit operate for a longer or a shorter period <br />' 3-3 <br /> COMPANY CONFIDENTIAL TRADE SECRET AND PROPRIETARY INFORMATION OF THE MARK GROUP Mir <br /> r <br />