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TABLE 1 <br /> 30-year Cost Estimate: Site Operations and Maintenance <br /> Former Manufactured Gas Plant Site <br /> Stockton, California <br /> Task 1 Task 2 Task 3 Task 4 Task 5 Estimated DTSC' Oversight Actual Cummulative <br /> Costs NPV2 <br /> Annual <br /> Annual Biennial Cap/Deed Monitoring Cap/Deed <br /> Costing-year Groundwater a Report Restrictions 5-year Estimated Annual <br /> Costing MNA Restrictions Estimated Cap 5-year y <br /> Schedule Monitoring & Sampling & Inspection Maintenance Review Review Inspection Review Total Cost Discount <br /> Reporting Evaluation and (Tasks 1 Review (Task 5) by Year Rate: 7% • <br /> Reporting 3 and 2) (Task 3) <br /> 2031 $22,300 $3,600 $200 $2,200 $400 $28,700 $438,714 <br /> 2032 $22,300 $3,300 $3,600 $200 $2,600 $400 $32,400 $443,928 <br /> 2033 $22,300 $3,600 $200 $2,200 $400 $28,700 $448,245 <br /> 2034 $22,300 $3,300 $3,600 $10,000 $5,000 $2,600 $400 $500 $47,700 $454,950 <br /> 11 Totals: $669,000 $49,500 $108,000 $104,800 $30,000 $72,000 $12,000 $3,000 $1,048,300 <br /> 1. DTSC =Department of Toxic Substances Control. Total Net Present Value: $454,950 <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 /> IN�� <br /> A &a red • Page 2 of 2 PSPG&E\Stockton\correspondence\30-Year Cost Estimate Jan2005 final <br />