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�1VTERIM PROBLEM ASSESSMENT REPORT/IiV3'MM REMEDIAL ACTION PLAN -13- <br /> Former Beacon Station No. 494, 2185 East Fremont Street <br /> Stockton, CA—AMV Project No. 19005.07 <br /> 7.0 DISCUSSION OF REMEDIATION ALTERNATIVES <br /> This section tion outlines an interim course of action for the remediation of soil and ground water <br /> ' underlying the site which contain petroleum hydrocarbon constituents. While the delineation of <br /> impacted soils is apparently complete, uncertainties remain with respect to the extent and <br /> Possible migration of impacted ground water. Accordingly, the remediation activities discussed <br /> ' in this section have two goals: <br /> 1. Removal of petroleum hydrocarbons from soil underlying the site to eliminate future <br /> ' impact on ground water. <br /> 2. Reduce or inhibit the migration of ground water underlying the site that contains <br /> ' dissolved petroleum hydrocarbons. <br /> 7.1 Removal of Petroleum Hydrocarbons from Soils <br /> Strategies considered for removing petroleum hydrocarbons from soils underlying the site <br /> include: <br /> • Passive Remediation <br /> • In Situ Soil Vapor Extraction <br /> Because of the depths of impacted soils excavation is <br /> not a viable alternative for this site. <br /> ' 7.1 1 Passive Remediation <br /> This alternative involves leaving the petroleum constituents in the soil and leaving the soil <br /> unaltered. Continuing natural volatilization and natural biodegradation of petroleum constituents <br /> in the soil would be expected to reduce concentrations of petroleum constituents with time. The <br /> available data does not preclude the possibility that these natural agents have already attenuated <br /> the hydrocarbon impact to a certain degree. <br /> The indication that soil layers underlying the site impede the vertical migration of petroleum <br /> ' constituents makes this alternative potentially viable. The existing ground water monitoring and <br /> sampling program could be used to verify that concentrations of petroleum constituents in ground <br /> water do not increase. A change in existing conditions (i.e., water table rise), would warrant <br /> a reevaluation of this alternative. <br /> rptoos.- <br />