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intervals. Slope ratios for all slopes except the north-facing slope of the existing Austin Road Landfill are proposed at 3:1 (horizontal to vertical). The existing Austin Road Landfill north slope is proposed at a 4:1 horizontal to vertical slope ratio. As shown on the final grading plan (Drawing 4), the existing Forward and Austin Road Landfills are proposed to be joined along the northern boundary of the existing Forward Landfill. The area directly north of Waste Management Unit (WMU) A at the existing Forward Landfillwillnot be filled because WMU Xis a closed hazardous waste cell. Refuse fill will not be placed over the existing leachate risers for WMUs D-89 and D-93 at the existing Forward Landfill to maintain continued access to these riser pipes and also to future leachate risers that will be constructed in this area. The remaining"e4ge,area between.4,ue.1wD existing landfills will provide approximately 8 million cubic yards of additional capacity when filled. The maximum elevation of the Forward Landfill will be approximately 200 feet amsl. This height is consistent with the-pem*ted rna um heeight for the exisfifinrg Forward Landfill. The peak elevation of the proposed deck area for the Forward Landfill is 200 feet amsl and from that point final deck grades slope down to 170 feet amsl in the area of the existing Austin Road Landffill-{ste 'ng,4). °T+tis=grading configuration allows conformance with the height limit zoning plan contours for the Stockton Municipal Airport (see Figure 2). 5.2.4 FINAL COVER 5.2.4.1 REGULATORY DESIGN STANDARDS California Final Cover Prescriptive Design Standard The minimum final cover standards for the Forward Landfill, as outlined in the closure and post-closure requirements for Class II landfills contained in 27 CCR, Section 21090 include: 0 Forward Landfill)TD 5-5 L:\AI li ed\2000.193\Reports\ina Ijtd:Sec-5.0:08/22/01 BRYAN A-STIRRAT S ASSOCIATES