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Table 8: Summary of Remedial Alternative Costs Geosyntec Consultants <br /> Rough and Ready Island, Site 47 <br /> Port of Stockton <br /> # Alternative Description Cost Low High <br /> (_30%) (+50%) <br /> 1 No Action $ - $ - $ - <br /> 2 Existing Durable Cover,Fence,and Institutional Controls $ 970,000 $ 679,000 $ 1,455,000 <br /> 3 Excavation with On-Site Consolidation,Existing and New Durable $ 4,500,000 $ 3,150,000 $ 6,750,000 <br /> Cover,and Institutional Controls <br /> 4 Excavation(to 2 feet)with Off-Site Disposal(Backfilled with Clean $ 47,800,000 $ 33,500,000 $ 71,700,000 <br /> Fill),Existing Durable Cover,and Institutional Controls <br /> Expanded Excavation with On-Site Consolidation Existing Durable <br /> 5 Cover,Expanded New Durable Cover,and Institutional Controls $ 5,500,000 $ 3,900,000 $ 8,250,000 <br /> AACE(Association for the Advancement of Cost Engineering)International CLASS 4 Cost Estimate—Class 4 estimates are <br /> generally prepared based on limited information,and subsequently have wide accuracy ranges. Typically,engineering is from 1%to <br /> 15%complete. They are often prepared for strategic planning purposes,alternative scheme analysis,and confirmation of economic <br /> and/or technical feasibility study. Expected accuracy ranges are from—15%to—30%on the low side and+20%to 50%on the high <br /> side,depending on technological complexity of the project,appropriate reference information,and the inclusion of an appropriate <br /> contingency determination. Ranges could exceed those shown in unusual circumstances. <br /> Page 1 of 1 <br />