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Appendix D: Alternatives Analysis Geosyntec Consultants <br /> Rough and Ready Island, Site 47 <br /> Port of Stockton <br /> EVALUATION (1)Health and safety risks posed by (2)Effect of contamination upon (3)Effect of alternative (4) Site-specific characteristics, (5) Cost-effectiveness of alternative (6)Potential environmental impacts of <br /> CRITERIA the conditions at the site present,future,and probable remedial action measures on including the potential for remedial action measures alternative remedial action measures' <br /> beneficial uses of contaminated, the reasonable availability of offsite migration of hazardous <br /> polluted,or threatened resources groundwater resources for substances,surface/subsurface <br /> present,future,and probable soil,and the hydrogeologic <br /> beneficial uses conditions,and preexisting <br /> background contamination <br /> levels <br /> 11 <br /> ALTERNATIVE 4 Compliant Compliant Not applicable Compliant Not compliant Compliant <br /> Excavation(to 2 Alternative 4 would remove impacted Alternative 4 achieves the RAOs by No remedy is required at this time Remedy adequately addresses Alternative 4 does not cost-effectively Alternative 4 presents H&S hazards during <br /> feet)with Off-Site soils from Site 47 to a depth of 2 feet bgs removing COC/COEC-impacted soils to to address groundwater at Site 47. risks posed by hazardous achieve the RAOs because of the construction(i.e.,excavation and staging of <br /> Disposal(Backfilled and would cover remaining COC/COEC- a depth of 2 feet below current ground substances in soil at Site 47. significant cost and increased short-term soils for off-site transport).However,worker <br /> with Clean Fill), impacted soils beneath clean backfill surface.Regular inspection and risks associated with off-site disposal. and community protection will be <br /> Existing Durable material. Land use and activities would maintenance are required to remain implemented via H&S (e.g., appropriate <br /> Cover,and be restricted to minimize exposure to effective. ICs would minimize long-term PPE)and engineering controls(e.g.,dust <br /> Institutional remaining COCs/COECs in soil. exposure to remaining COCs/COECs in suppression measures).Excavation and off- <br /> Controls2 soil. site transport of COC/COEC-impacted soil <br /> pose increased short-term risks to <br /> community and has greater environmental <br /> impact. <br /> ALTERNATIVE 5 Compliant Compliant Not applicable Compliant Compliant Compliant <br /> Expanded Alternative 5 would isolate COC/COEC- Alternative 5 achieves the RAOs by No remedy is required at this time Remedy adequately addresses Alternative 5 cost-effectively achieves Alternative 5 presents H&S hazards during <br /> Excavation with On- impacted soils and would reduce isolating COC/COEC-impacted soils to address groundwater at Site 47. risks posed by hazardous the RAOs by isolating COC/COEC- construction(i.e.,grading and cover <br /> Site Consolidation, exposure to humans and ecological from human and ecological receptors. substances in soil at Site 47. impacted soils from human and installation).However,worker and <br /> Existing Durable receptors. Land use and activities would Regular inspection and maintenance are ecological receptors. community protection will be implemented <br /> Cover,Expanded be restricted to minimize exposure to required to remain effective. ICs would via H&S (e.g.,appropriate PPE) and <br /> New Durable Cover, remaining COCs/COECs in soil. minimize long-term exposure to engineering controls(e.g.,dust suppression <br /> and Institutional remaining COCs/COECs in soil. measures). <br /> Controls2 <br /> Notes <br /> 1.None of the remedial alternatives provide treatment to reduce the toxicity,mobility,or volume of contaminants. <br /> 2.All alternatives include the implementation of a land-use covenant, similar to the restrictions described in the pre-decisional land-use covenant prepared in accordance with the 2003 Consent Agreement. <br /> Abbreviations <br /> ARARs=Applicable,or Relevant and Appropriate Requirement;ICs=institutional controls ICs=institutional controls <br /> COCs=constituents of concern PPE=personal protective equipment PPE=personal protective equipment <br /> COECs=constituents of ecological concern RAOs=remedial action objectives RAOs=remedial action objectives <br /> H&S=health and safety <br /> Page 2 of 2 <br />