ARCHIVED REPORTS_2011 REVISED FEASABILITY STUDY

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Table 3:Comparative Matrix of Remedial Alternatives 2011 Revised Feasibility Study Former Nestle USA,Inc.Facility Ripon,CA Alternative 1: Alternative 2: Alternative 3: Alternative 4: No Action Expand Pump-and-Treat, Pump-and-Treat, Pump-and-Treat, Institutional Controls, In-situ Source Removal, focused In Situ Source Monitored Intrinsic Institutional Controls, Removal if appropriate, Remediation Monitored Intrinsic Institutional Controls, Remediation Monitored Intrinsic Remediation Does not adequately protect Protection of human health Protection of human health Protection of human health potential receptors and the environment achieved and the environment achieved and the environment achieved Overall Protection of Human under this alternative. under this alternative. under this alternative. Health and the Environment The rate of reduction in Reduction in mobility and Reduction in toxicity,mobility Reduction in toxicity,mobility toxicity,mobility,and plume volume are achieved by and volume are achieved by in and volume are achieved by Reduction in Toxicity, volume is likely slower. removing and treating situ chemical treatment and targeted pump-and treat and Mobility,and Volume groundwater. removing and treating contingency in-situ chemical groundwater. treatment. Not effective in the short term. Effective in short-term by Effective in short-term by Effective in short-term by containing the source and containing the source and containing the source and Short-Term Effectiveness protecting receptors through removing COC mass. removing COC mass. institutional control. Receptors protected through Receptors protected through institutional controls. institutional controls. COC concentrations remain Effective long-term. Time to Effective long-term. Effective long-term. above RAOs for reach RAO's is longer in approximately 75 years.Not comparison to Alternative 3 Long-Term Effectiveness as effective in long term due and 4. to lack of potential receptor protection. RAO's are met after 75 years RAO's are met in 35 years RAO's are met in 12 years RAO's are met in 12 to 15 of natural attenuation based based on current modeling based on current modeling years based on current Achievement of Remedial on current modeling results. results. results. modeling results. Action Objectives No activity to implement. Implementability is difficult Implementability is moderate Implementability is optimal relative to Alternatives 3 and 4 relative to Alternatives 2 and 4 relative to Alternatives 2 and 3 due to: due to: due to: -Selection of well locations -In-situ treatment may -In-situ treatment(if -Property access produce toxic products in necessary)may produce toxic Implementability -Conveyance of greater groundwater which require products in groundwater which volume of extracted and further treatment require further treatment treated groundwater from -In-situ treatment of multiple multiple locations (Upper and Intermediate) -Disposal of greater volume of aquifers and locations treated groundwater presents technical challenges Cost (excluding regular groundwater monitoring and $0 $45,401,000 $9,616,000 $3,709,000 to$7,921,00 ongoing project management costs)