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Final Remediation Plan Page 10 <br /> Ranch Market 23569 South Santa Fe Road Riverbank CA February 28 2001 <br /> • Given the general assumptions used, the total estimated mass of hydrocarbons in the soil and <br /> groundwater at the site could vary by as much as +or— 50% <br /> 5.0 EVALUATION OF REMEDIATION ALTERNATIVES <br /> 5.1 Soil and Groundwater Remediation Goals <br /> Soil and groundwater cleanup levels for the Site will be determined by site-specific risk based <br /> evaluation in conjunction with beneficial use analysis The objective of the remediation will <br /> be removal and/or in-situ destruction of hydrocarbons adsorbed to soil and dissolved in <br /> groundwater to concentrations below risk-based levels <br /> 5.2 Evaluation of Remedial Alternatives <br /> The following Technologies to remediate petroleum hydrocarbons adsorbed to soil and <br /> dissolved in groundwater at the Site were evaluated <br /> • Soil Excavation, <br /> • Passive Biodegradation with long term groundwater monitoring, <br /> • In-situ Biologic and/or Chemical Treatment, <br /> • Soil Vapor Extraction combined with Air Sparging (SVE/AS), <br /> . • Soil Vapor Extraction combined with Ozone Sparging (SVE/OS), and <br /> • SVE/AS combined with Groundwater Extraction and Treatment (GET) <br /> Due to the depth to water and high formation permeability, cost estimates for Dual Phase <br /> Extraction and Water Treatment (DPET) were not prepared A remediation feasibility matrix <br /> summarizing the estimated cost of each remedial option has been included in Appendix C <br /> Based upon the distribution of gasoline in the soil and groundwater, the lithology, and depth <br /> to groundwater, SECOR eliminated most of the considered alternatives <br /> 5.2.1 Soil Excavation <br /> Removal of the impacted soil by excavation was eliminated due to the impracticality of <br /> excavating to depths in excess of the 30 feet In addition, soil excavation will not remove or <br /> degrade the gasoline dissolved in groundwater, <br /> 5.2.2 Passive Biodegradation <br /> Passive biodegradation does not address migration of dissolved MtBE or the gasoline <br /> adsorbed to soil in the vadose zone The cost estimate presented in Table 1 assumes 20 years <br /> of quarterly groundwater monitoring and sampling SECOR does not recommend this <br /> remedial approach <br /> File FRP-report doc SFCOR International Incorporated <br />