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TABLE 1 <br /> Revised 30-year Cost Estimate: Site Operations and Maintenance <br /> Former Manufactured Gas Plant Site <br /> Stockton, California <br /> Actual Cummulative <br /> Task 1 Task 2 Task 3 Task 4 Task 5 Estimated DTSCt Oversight Costs NPV2 <br /> Annual Monitoring Cap/Deed <br /> Annual Biennial Cap/Deed Report Restrictions 5-year Estimated Annual <br /> 30-year Groundwater MNA° Restrictions Estimated Cap 5-year <br /> Costing Review Inspection Review Total Cost Discount <br /> g • <br /> Monitoring & Sampling & Inspection Maintenance Review (Tasks 1 Review (Task 5) by Year Rate: 7% <br /> Schedule Reporting; Evaluation and and 2) (Task 3) <br /> Reporting' <br /> 2031 $22,600 $3,600 $200 $2,300 $400 $29,100 1 $444,456 <br /> 2032 $22,600 $3,500 $3,600 $200 $2,600 $400 $32,900 $449,750 <br /> 2033 $22,600 $3,600 $200 $2,300 $400 $29,100 $454,127 <br /> 2034 $22,600 $3,500 $3,600 $10,000 $5,000 $2,600 $400 $500 1 $48,200 $460,902 <br /> Totals: $678,000 $52,500 $108,000 $104,800 $30,000 1 $73,500 1 $12,000 1 $3,000 1 $1,061,800 <br /> Total Net Present Value: $460,902 <br /> 1. DTSC= Department of Toxic Substances Control. <br /> 2. NPV=net present value estimated using discount rate of 7% <br /> based on the federal Office of Management and Budget Circular No.A-94 and the United States Environmental Protection Agency guidance document: <br /> A Guide to Developing and Documenting Cost Estimates During the Feasibility Study published in July 2000. <br /> 3. See detail estimate for annual costs on Table 2. <br /> 4. MNA=monitored natural attenuation. <br /> • <br /> i ! Page 2 of 2 P:\PG&E\Stockton\Repos\Financial Assurance\Revised 30-Year Cost Estimate 25Feb2005 <br /> l J•! lJ PJ <br />