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Problem Assessment Report Page 14 <br /> Ranch Market,23569 South Santa Fe Road,Riverbank CA November 8,2000 <br /> presented in Appendix E The following estimated mass and volume of gasoline range <br /> hydrocarbons are present at the site <br /> 1 <br /> Petroleum Hydrocarbons As Gasoline Gallons Gasoline Pounds Gasoline <br /> Volume/Mass Adsorbed to Soil 1,666 11,624 <br /> Volume/Mass Dissolved in Groundwater 32 227 <br /> Total Mass Estimated Mass 1,698 11,851 <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%, or 849 to 2,547 gallons of <br />' gasoline <br /> 9.0 EVALUATION OF REMEDIATION ALTERNATIVES <br /> 9.1 Soil and Groundwater Remediation Goals <br /> Soil and groundwater soil cleanup levels for the Site will be determined by site-specific risk <br /> based evaluation in conjunction with beneficial use analysis The objective of the remediation <br /> will be removal and/or in-situ destruction of hydrocarbons adsorbed to soil and dissolved in <br /> liegroundwater to concentrations below risk-based levels <br /> 9.2 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 /> I • Groundwater Extraction and Treatment (GET), <br /> • Dual Phase Extraction and Water Treatment (DPET), and <br /> • Soil Vapor Extraction combined with Air Sparging (SVE/AS), and <br /> • In-situ Chemical Treatment <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 /> • Soil Excavation - Removal of the impacted soil by excavation was eliminated due to <br /> the impracticality of excavating to depths in excess of the 30 feet In addition, soil <br /> excavation will not remove or degrade the gasoline dissolved in groundwater, <br />' • Groundwater Extraction --Although extraction of groundwater could used to control <br /> the downgradient migration of the dissolved gasoline, it was eliminated because it <br /> would not remove hydrocarbons adsorbed to soil within the vadose zone and capillary <br /> File PAR-report doe SECOR International Incorporated <br />