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PROBLEM ASSESSMENT REPORT <br /> Moore Petroleum, Inc. <br /> 14804 41. Frontage Road, Manteca, CA <br /> NGA Project No. 10.90-479 <br /> Page 14 <br /> 5.^ REMEDIATION ALTERNATIVES <br /> 5.1 Boil <br /> Possible remediation alternatives for gasoline contaminated soils <br /> include in--situ biological treatment, soil excavation, and soil <br /> venting (in-situ volatilization) . Soil venting is typically <br /> utilized to volatilize gasoline constituents in soils that are <br /> moderately to highly permeable to air flow. Examination of the <br /> geologic cross-sections presented as Figures 4 and 5 indicates that <br /> the bulk of petroleum constituents occur within sand or silty <br /> sands. These lithologies should be sufficiently permeable to air <br /> flow to allow soil venting to be a viable remedial alternative. <br /> At this site, soil venting appears to offer a number of advantages <br /> over either in-situ biological treatment or excavation. Some of <br /> these advantages are: <br /> e soil venting will not affect continued site operations. <br /> - a Soil venting, with the addition of an emissions control <br /> system, is a destructive technology, and will not <br /> result in contaminants either being moved off-site or <br /> contaminants simply changing medium. <br /> s Soil venting activities will not adversely affect <br /> ground water beneath the site, and can be undertaken <br /> independently of ground-water remediation activities. <br /> i-� <br /> o Soil venting activities will not pose a threat to <br /> , either on- or off-site structures or nearby roads. <br /> • The total time required for soil remediation is <br /> generally short, typically six months to one year. <br /> }R= Because 'of these advantages, soil venting is proposed to remediate <br /> site soils containing hydrocarbon constituents. <br /> in order to implement the proposed soil venting system NGA proposes <br /> the followings <br /> a The below-ground components of the soil venting system <br /> installed at the site in November, 1989, (Section 3.3) <br /> be combined with a commercial grade-blower in order to <br /> produce sufficient soil gas pressure changes to ensure <br /> air flow within site soils containing petroleum <br /> constituents, <br /> e Monitoring wells MW-1, MW-2, MW-3, and MW-4, which are <br /> located near the perimeter of the extent of petroleum <br /> -- -- _-const-ituents..._..in sails ...-.Fi ure .6...- be-..--.. o <br /> ( g ) , periodically <br />