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0 ENV/RONMENTAL 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, ##0This unit is indicated in Attachment E. WMU B - This is a Class III landfill,covering containsWMU B # no hazardous solid waste, and is undergoingclosure. WMU C - This is a Class M landfill, covering three acres in the southern end of Trench 4 of compacted 1. diker. • `. lf ofTrench from the t,. hazardous solid wastes" and "inert waste" placed in the southern half. WMU D - 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 coversWMU D-87 was constructed in 1987 and covers 2.5 acres. This unit, as shown in Attachment • portions of and WMU C. It is now# • • WMU D-88 was constructed in 1988, has a 4 -foot thick compacted soil liner, and extends for 4.2 acres. WMU D-88 is divided by an internal earthen dike to isolate the southern 1.2 acres (WMU D-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 fromacidiclandfill 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 II landfill requirements of Subchapter 15. This WMU covers four acres. WMU - This is a Class H landfill, covering 3.7 acres. It was constructed to meet Title 23, ChapterSubchapter 15 :# dedicated tothedisposal t. designf 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 #. of 1 111 cubic yards.•, pit has . capacity of 260,000 cubic yards.pits will be constructed once the first pit is filled. Mproposed 11 impoundment,•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. WMU 9 - This is a Class H 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 •Ookland,Calitornio,USA 94611 TEL(415)339-1543- FAX(415)339-6775