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AO) ENV/RONME-NTAL TECHNOLOG/ES Both DOHS and EPA approved the Closure Plan for this unit on September 23, 1988, and also approved modifications to this Closure Plan on May 23, 1989. WMU A is now closed, and is operating under a hazardous waste facility post-closure permit, issued by the EPA and DOHS, effective January 2, 1990. This unit is indicated in Attachment E. NEffiU - This is a Class III landfill covering eight ht acres. WMU B contains inert waste and no hazardous solid waste, and is undergoing closure. WMU C - This is a Class ffi landfill, covering three acres in the southern end of Trench 4 of WMU A. A compacted clay dike separates the northern half of Trench 4 from the "non- hazardous solid wastes" and "inert waste" placed in the southern half. V;MU J2 - This consists of several Class III WMUs and future Class II WMUs for "non- hazardous solid waste* and *inert waste." The WMU D-89 site will eventually be extended to a final size of approximately 65 acres and 5.4 million cubic yards. Details of WMU D are presented in Attachment C. WMU D-87 was constructed in 1987 and covers 2.5 acres. This unit, as shown in Attachment E, covers low portions of WMU B and WMU C. It is now undergoing closure. constructedWMU D-88 was 4-foot thick compactedsoil liner, and extends for 4.2 acres. VVMU D-88is divided by an internal earthen dike to isolate the southern . acres -88 South) from landfill leachate generated in the northern portion of the WMU(WMU D-88 North). This allows for wastes contaminated with acid-soluble inorganics to be isolated from acidic landfill leachate. WMU D-89 was constructed in 1989 and has a 4-foot thick compacted clay floor liner and a 10-foot thick compacted clay sidewall liner. It was constructed to meet the Class H landfill requirements of Subchapter 15. This WMU covers four acres. MM - This is a Class II landfill, covering 3.7 acres. It was constructed to meet Title 23, CCR, Chapter 3, Subchapter 15 requirements. It is dedicated to the disposal of ash such as coal and wood ash, and may be expanded to about 13 acres, as shown in Attachment C. The entire unit has a design rapacity of 520,000 cubic yards. The eastern-most pit has a capacity of 260,000 cubic yards. New pits will be constructed once the first pit is filled. rYM E - This is a proposed Class 11 surface impoundment, covering approximately 5 acres. WMU F will hold leachate and other designated wastes compatible with the liner. A temporary/interim WMU F was constructed west of WMU E in 1988 to accommodate landfill leachate only. This impoundment will be closed when the permanent WMU F is built. M - This is a Class II land treatment unit which may be sited within the WMU D or WMU H areas prior to landfilling (see Attachment D). Soils contaminated with less than hazardous levels of petroleum hydrocarbons will be stored and treated at WMU G. WMU G 3 7255 Soroni Drive•Ooklond,Colifornia,USA 94611 TEL(415)339-1543-FAX(415)339-6775