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PROBLEM ASSESSMENT REPORT <br /> Hoare PetroleLcn, Inc. <br /> 14800 W. Frontage Road, Manteca, CA <br /> NGA Project No. 10-90-479 <br /> Page 15 <br /> monitored for soil vapor pressure changes to ensure <br /> that soil vapor containing petroleum constituents is <br /> being drawn from the perimeter of the area containing <br /> petroleum constituents. <br /> s Use of a thermal oxidizer and/or catalytic oxidizer to <br /> control air emissions. <br /> Prior to implementation of the soil venting system an application <br /> for a Authority to Construct/Permit to Operate willbe submitted <br /> to the San Joaquin Air Quality Management District. Final design <br /> of the soil venting system °which will include .all . above--ground <br /> piping and plumbing details -- details of air emission controls and <br /> other. above-ground hardware .specifications, will be included in <br /> this permit application. <br /> 5.2 Ground Pater <br /> Practical ground-water remediation alternatives are probably <br /> limited to variations of pumping and treating ground water at this <br /> site. A cost-effective pumping and treating system for ground- <br /> water remediation at the site should accomplish the following <br /> goals. <br /> e Capture the dissolved plume of hydrocarbons in order <br /> to prevent off-sitemigration. <br /> e Quickly remove ground-water. containing dissolved <br /> hydrocarbons from the aquifer. <br /> 0 Rapidly lower concentrations of dissolved hydrocarbons <br /> in recovered ground water to levels suitable for <br /> disposal. <br /> In order to meet the goals of ground-water remediation, the <br /> computer program DREAM (Lewis Publishers, 1989) was utilized to <br /> model ground-water flow to determine the most efficient arrangement <br /> of extraction and/or injection wells to quickly capture and remove <br /> the dissolved plume of hydrocarbons. The computer program was also <br /> used in estimating the time needed for ground-water remediation <br /> at the site. <br /> DREAM is an analytical (as opposed to numerical) ground-coater flow <br /> model that uses the Theis equation to calculate drawdowns and water <br /> level elevations due to pumping and/or injection wells. The <br /> following assumptions are inherent in the The equation. <br /> •- The aquifer is homogeneous,. isotropic, confined, of - <br /> uniform thickness, and infinite areal extent. <br />