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Final Remediation Plan Page 12 Ranch Market 23569 South Santa Fe Road Riverbank CA February 28 2001 hydrocarbons from the vadose zone Ozone will be infected Into a total of 12 points using a solenoid controller that will rotate the infection of ozone to each point at a rate of 6 cfm SECOR recommends the combination of SVE and ozone sparging as the most economic and practical remedial approach at the Site 5.2.6 SVE/AS combined with Groundwater Extraction The combination of groundwater extraction could be used to control the downgradient migration of the dissolved gasoline and also remove gasoline from the vadoes zone and dissolved in groundwater The costs presented in Table 1, assume one groundwater extraction well pumping at 25 gallons per minute would result in hydrologic control of the dissolved gasoline plume Given the sandy nature of the sediments underlying the site, hydrologic control of the site may require additional wells and a significantly higher rate of water production Due to the higher cost of installation and operation of the GWE system and possibility that water production rates in excess of 25 gpm could significantly increase equipment costs, SECOR does not recommend this option 5.3 Remedial Alternative Recommendation Based on the cost estimate provided in Appendix C, Table 1 and the discussion presented above, SECOR recommends soil vapor extraction combined with ozone sparging as the most effective remedial approach Soil vapor extraction will remove the gasoline from the vadose • zone and ozone infection will chemically destroy and enhance biodegradation of the gasoline adsorbed to the saturated soil and dissolved in groundwater The lower ozone infection rates will also reduce the risk of driving the dissolved gasoline range petroleum hydrocarbons offsite 5.4 Conceptual Remedial Alternative Design The goal of the remediation project is removal and/or in-situ destruction of the gasoline adsorbed to soil and dissolved in groundwater to concentrations below site-specific risk based levels Using an SVE radius of influence of 40 feet, a total of 10 soil vapor extraction wells are proposed to remove the hydrocarbons from the vadose zone and to capture the ozone infected into the sparging wells Assuming a 25 to 30-foot radius of influence for the ozone infection, a total of 12 ozone sparge wells are proposed to either remove or stimulate in-situ biologic destruction of the petroleum hydrocarbons in the saturated zone The location of the existing and proposed SVE and ozone sparging (OS) wells are shown on Figure 11 During the SVE/AS feasibility test the individual well flows ranged from 30 to 130 scfm at 50 to 100 in H2O The combined flow from the 6 wells averaged ranged from 165 to 220 scfm with applied vacuums of 50 to 75 in H2O Depending on the available power supply at the Ranch Market, a soil vapor extraction ozone infection system should have the following specifications Catalytic Oxidizer Flow rate of 300 to 500 scfm at 75 to 100 inches of water A total of 10 SVE wells with extraction rates of 30 to 50 scfm File FRP-report doe SECOR International Incorporated