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o N CJl c.., CHAPTER VI PRELIMINARY FINDINGS . renewed leakage or failure of plugs in other oil wells around the dome occurs, it should be checked. Permanent plugs in all the wells are essential to verify that natural springs are not a contributing factor in salt loading. Any increase in salt loading not directly related to the Scott, James, or Marland Wells would require additional studies to identify the source and flow mechanism. Financial and Economic Analysis Costs of the Meeker Dome investigations were $2,870,000 through FY 1983. It is estimated that an additional $160,000 will be needed for future monitoring and preparation of the final report. The actual ex- penditures to date and the estimated future disbursements are shown below. CHzM HILL contract Basic investigation Verification study Monitoring Reclamation expenditures Balance to complete final monitoring (FY 1984) and report (FY 1985) Total unit cost Annual equivalent cost (100 years at 7 7/8 percent) Salinity reduction at Imperial Dam (mg/L) Cost effectiveness ($/mg/L) $250,000 1,700,000 30,000 890,000 160,000 3,030,000 239,000 1.6 149,000 If the well plugging has effectively reduced the salt loading from Meek.er Dome, no operation, maintenance, and replacement would be re- quired, rendering investigation costs the only unit costs. Under Recla- mation law, preauthorization investigation costs are not subject to interest during construction. The cost-effectiveness figure of $149,OOO per mg/L is a conserva- tive estimate since salt loading is continuing to decline and the 1.6 mg/L effect is expected to improve. Future Reports . If, at the end of the monitoring period in September 1984, the results continue to indicate that the well plugging has effectively reduced the salt contribution from the Meek.er Dome, the investigation will be terminated, and a report which will include the final monitoring results will be prepared on the unit in FY 1985. . 24