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Addendum To The Problem ASSeSSmLnt Report 3 <br /> Ranch Market 23569 Santa Fe Road Riverbank California December 18 2000 <br /> • dissolved gasoline range petroleum hydrocarbons The sparging will also increase the dissolved <br /> oxygen concentration in the groundwater and stimulate in-situ destruction of gasoline by aerobic <br /> bacterial activity <br /> The costs associated with installation and operation of an SVE system for 2 years and the ozone <br /> sparging system for 4 years have been included in Table 1 Using an SVE radius of influence of <br /> 40 feet, a total of 10 soil vapor extraction wells are proposed to remove the hydrocarbons from <br /> the vadose zone and to capture the air injected into the air sparging wells Ozone will be sparged <br /> into a total of 6 points using a solenoid controller that will rotate the injection ozone to each <br /> point at a rate of 3 cfm <br /> SECOR recommends the combination of SVE and ozone sparging as the remedial approach at <br /> the Site <br /> Option 6 SVE/AS combined with Groundwater Extraction <br /> The combination of groundwater extraction could be used to control the downgradient migration <br /> of the dissolved gasoline and also remove gasoline from the vadoes zone and dissolved in <br /> groundwater The costs presented in Table 1, assume one groundwater extraction well pumping <br /> at 25 gallons per minute would result in hydrologic control of the dissolved gasoline plume <br /> Given the sandy nature of the sediments underlying the site, hydrologic control of the site may <br /> require additional wells and a significantly higher rate of water production Due to the higher <br /> cost of installation and operation of the GWE system and possibility that water production rates <br /> . in excess of 25 gpm could significantly increase equipment costs, SECOR does not recommend <br /> this option <br /> REMEDIAL ALTERNATIVE RECOMMENDATION <br /> Based on the cost estimate provided in Table I and the discussion presented above, SECOR <br /> recommends soil vapor extraction combined with ozone sparging as the most effective remedial <br /> approach The remedial option will remove gasoline currently adsorbed to soil and dissolved in <br /> groundwater at the Site to below nsk-based levels <br /> File Ranch Market%PAR Cost Est I doc <br />