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CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION ORDER NO. WASTE DISCHARGE REQUIREMENTS FOR PACIFIC GAS & ELECTRIC COMPANY POST-CLOSURE MAINTENANCE OF CLASS II SURFACE IMPOUNDMENTS McDONALD TRACT, SAN JOAQUIN COUNTY The California Regional Water Quality Board, Central Valley Region, (hereafter Board), finds that: 1 . The Pacific Gas and Electric Company, (hereafter Discharger), owns three closed Class II Surface Impoundments. The surface impoundments comprise a facility commonly referred to as the McDonald Island Class II Drilling Mud Disposal Surface Impoundments. This facility was previously regulated by Waste Discharge Requirements (WDRs) Order No. 74- 372. A Closure Plan was submitted in April 1991 followed by an Article 5 Water Quality Monitoring Program dated June 1992, a Confirmation Soil Sampling and Analysis Plan in July 1994, and a Closure Certification Report dated 5 December 1994. These waste discharge requirements combine information from the previous WDRs,the Water Quality 0 Monitoring Plan, the Closure Plan, and the Closure Certification Report. 2. The site is about 10 miles west of Stockton in the Sacramento-San Joaquin Delta, in Section 25, T2N, R4E, MDB&M, as shown on Attachment A, which is incorporated herein and made a part of this Order. 3. The three closed Class II surface impoundments were constructed in 1974 for the disposal of drilling fluids and produced formation fluids generated at underground gas storage facilities on McDonald Island. The closed surface impoundments were located adjacent to Whiskey Slough and were originally constructed as agricultural silage pits. The former surface impoundments are shown on Attachment B, which is incorporated herein and made a part of this Order. Wastes and Their Classification 4. Only Pond 3 has been actively used for waste disposal operations for the discharge of 'designated' and 'Inert' wastes. This pond contained about 31,000 cubic yards of spent drilling fluids and produced formation water and well completion fluids discharged between 1974 and 1986. Only minor quantities of waste materials were discharged to Surface impoundments 1 and 2. Because of design deficiencies, the Discharger was ordered in 1986 to stop discharging materials to the surface impoundments. Since August 1986, all production fluids and spent drilling muds from the McDonald Island facility have been disposed of offsite and the Discharger has completed closure of the surface impoundments. 5. A Solid Waste Assessment Test (SWAT) was submitted by Discharger on 29 June 1990 which determined that hazardous waste was not leaking from the site, therefore closure was based on Title 23, Division 3. Chapter 15 (no Title 22 requirements).