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SECTION 6 <br />' ENGINEERING EVALUATION OF <br />' REMEDIAL ALTERNATIVES <br />' At PHS EHD request, ERM performed an evaluation of remedial <br /> alternatives for hydrocarbon-containing soils at Former Tank Sites #1 <br /> and #2 This section presents the results of that evaluation <br />' Screening Criteria <br /> Alternatives for the remediation of hydrocarbon-containing soils were <br /> previously screened and evaluated in ERM's Preliminary Assessment <br /> Report for Former Storage Tanks Located at 1325, 1541, & 1515 West <br />' Weber Avenue, Stockton, California (May 1993) In this report, ERM <br /> concluded that three potential remedial alternatives (excavation, soil <br /> venting/vapor extraction, and no action) were potentially applicable to <br /> hydrocarbon-impacted soils at Sites #1 and #2. The following sections <br /> provide a further screening of these the potential effectiveness of these <br /> alternatives to remediation of the residual TPH-impacted sods at Sites <br /> #1 and #2 <br />' Screening of Soil Remedial Alternatives <br />' This section presents an evaluation of potential soil remedial <br /> alternatives for Former Tank Sites #1 and #2 <br /> Excavation <br /> Excavation consists of removing the hydrocarbon-containing soils <br /> from the site with conventional excavation equipment (e g , backhoe) <br /> Clean soil would be imported to backfill the excavated area Excavation <br /> by itself is effective in removing the affected soils from the site to limit <br /> potential migration of the hydrocarbons, however, it is not effective in <br /> remediating the affected soils unless further treatment or disposal is <br /> undertaken. Excavation would therefore be appropriate as part of other <br /> alternatives (e g , ex situ soil aeration, off-site soil treatment, or <br />' 6-1 <br />