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Draft Supplemental Environmental Impact Report Page 111-18 Forward Inc.Landfill 2018 Expansion Project WMU D comprises a significant portion of the area north of the South Fork of South Littlejohns Creek. Operating WMUs in this area are permitted to receive designated wastes, and were constructed to meet Class II regulatory requirements for base liners and LCRSs. WMU E is an ash fill, also known as the Eastern Ash Disposal Pit,was constructed in 1987 at 4 acres and was expanded to 6 acres in 1992. A liner was placed over the northern, eastern, and western sides of WMU E in 1999 and 2000 to separate the ash from designated waste that would be placed above it. A final cover was placed on the south side in 1999. WMU F North, constructed in 1999,is an approximately 1-acre leachate'impoundment located just north of the South Fork on the western side of the site. The leachate impoundment was sized based on actual leachate generation records from 1991 to 1997 and has a design capacity of approximately 3.5 million gallons. WMU F-West, constructed in 2003,is a leachate impoundment located west of WMU FU-03 and has a design capacity of 3.4 million gallons. Both leachate impoundments are classified as Class lI impoundments and contain a double liner and leachate collection system. Soil treatment and sludge drying is permitted in WMU G. WMU G is divided into G-North and G-South, located north and south of the South Fork of South Littlejohns Creek,respectively. ' The WMU G units occupy the same areas as WMUs D and Future H. The WMU D units have replaced WMU G-North. As currently permitted,WMU Future H will replace WMU G-South (currently the site of the materials recovery facility)to accommodate waste disposal. The northern portion of Forward Landfill encompasses the former Austin Road Sanitary Landfill,which began accepting municipal solid waste in 1954 and which, as mentioned above, ' does not contain a base liner or LCRS. Forward purchased the former Austin Road Landfill from the City of Stockton in 2000. The former Austin Road Landfill was under a Regional Water Quality Control Board (RWQCB)corrective action program for volatile organic compound (VOC)contaminated groundwater at the time of the purchase. Forward is continuing to monitor and remediate the groundwater contamination from the former Austin Road Landfill. The top of the former Austin Road Sanitary Landfill has been graded to drain to the south, and a final cover was placed on the top and on the entire northern slope. The northern portion of WMUs FU-03 to FU-08 overlies the top of the former Austin Road Sanitary Landfill. Only Class III waste is permitted for placement above the top of the former Austin Road Sanitary Landfill. The southern portion of these WMUs overlies the southern slope of the former Austin Road Landfill and the portion of the site that was known as the former Austin Road Landfill ' Expansion Area. The southern portion of the WMUs is constructed to meet Class II(designated waste)requirements for base liners and LCRSs and is permitted to receive designated wastes. Liners are placed to separate the Class 11 waste in the southern portion of WMUs FU-03 to FU- 13 from the Class III waste located in the former Austin Road Sanitary Landfill. 'Leachate varies in composition depending on the age of the landfill and the type of waste that it contains,but usually contains both dissolved and suspended material and may contain various contaminants.