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WASTE DISCHARGE REQUIREMENTS -3- PACIFIC GAS AND ELECTRIC McDONALD TRACT SAN JOAQUIN COUNTY Surface Impoundment Closure 13. The Closure Plan, submitted by Discharger on 30 April 1991, was approved by the Board on 9 April 1992 with the condition that the cleanup limits for native soils underlying the surface impoundments are 200 mg/1 chloride, 5 mg/l barium, and 250 mg/l sulfate. 14. The closure of the surface impoundments was conducted August through November 1994. Pond closure activities included removing and properly disposing all drilling mud materials and six inches of underlying native soil from Pond 3. About 20,000 cubic yards (30,000 tons) of non-hazardous drilling mud and native soil were removed from the site. The native soil layer beneath the drilling mud was visually examined and found to be clean and not discolored. Analysis of confirmation soil sampling indicated that all of the chemical constituents of concern - barium, chloride, sulfate and EC were at levels below the approved site cleanup levels. 15. The Discharger submitted a Surface Impoundment Closure - Closure Certification Report dated 5 December 1994. The action of clean closing the ponds constitutes corrective action measures in accordance with Title 23, CCR, Chapter 15, Section 2550.10(c). A Water Quality Monitoring Program, dated June 1992, was submitted by the Discharger which described ground and surface water monitoring results and analysis. A Corrective Action Monitoring Program(CAMP) is required to be submitted by the Discharger which updates ground water monitoring results and analysis for the facility. 16. Surface impoundments I and 2, which were not used for drilling mud disposal, were backfilled. 17. Regrading of Pond 3 began immediately after soil cleanup was confirmed as complete. Surface impoundments 1, 2 and 3 were regraded according to the Final Grading Plan. After regrading, revegetation of the pond site with native plants was completed. CEQA and Other Considerations 18. The action to revise WDRs for the closure of the Class II waste disposal surface impoundments is exempt from the provisions of the California Environmental Quality Act (Public Resources Code Section 21000, et seq.), in accordance with Title 14, CCR, Section 15301. 19. This order implements: a) the Water Quality Control Plan,Third Edition, for the Sacramento River Basin and the San Joaquin River Basin; b) The prescriptive standards and performance goals of Chapter 15, Division 3, Title 23 of the California Code of Regulations, effective 27 November 1984, and subsequent revisions;