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`'feasibility Study—Enhancement of Existing Remediation Activities 8200 N. Highway 99, Stockton, CA # Page 6 of 10 X Criterion 3 -Cost: Existing infrastructure will significantly reduce the cost this alternative making it substantially less expensive than in-situ chemical oxidation. Costs for permitting, well installation, pump, manifold modifications and connection to the existing conveyance lines could be approximately $20,000. The groundwater treatment system is in place and the addition of a new well will not greatly alter the costs of operating and maintaining the system, monitoring and sample collection, as well as carbon replacement. Total project costs for installation as well as additional sampling requirements, and possible additional carbon change-outs for two years could be expected to reach up to $50,000. X Criterion 4—Regulatory and Community Acceptance: This alternative should meet with public and regulatory acceptance. 2.3.2 Alternative 2—In-Situ Chemical Oxidation X Criterion 1 -Implementation Issues: As mentioned previously, direct treatment of the groundwater plume downgradient of the site is not considered feasible due to the size of the area that would need to be treated and the lack of treating the source. This alternative may have implementability delays should the results of bench testing and/or other regulatory requirements for ISCO remediation alternatives. Source area treatment is feasible from a technical perspective and should be readily implementable onsite if soil borings indicate enhancement of existing groundwater treatment in the source area is warranted. X Criterion 2 -Effectiveness: Based on the demonstrated effectiveness of chemical oxidation at numerous contamination sites, this alternative has a high probability of success of remediating contaminants in the treated area. In the longer term, the downgradient plume (near MW 12), having been barricaded from a continuing source of replenishment by an ozone curtain, would degrade by natural attenuation processes. This would not address the source area directly only the distal portions of the plume. X Criterion 3 - Cost: The total project costs including bench testing ($10,000), pilot testing ($50,000), up to eight injection wells ($35,000), ozone generator ($35,000), construction related costs ($25,000), operation and maintenance ($6,000/yr), and modified sample collection and analysis ($3,500/yr) will probably exceed $185,000. G:IGROUNDZEITULEBURGIReports10709 FS rem enhancement.doc