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gradients of 5 percent sloping toward top deck perimeter berms. The top deck <br /> berms will divert surface flows to down drains. Landfill slope runoff is also <br /> directed to downdrains via benches located at 50 foot maximum vertical <br /> intervals. Slope ratios for all slopes except the north-facing slope of the existing <br /> Austin Road Landfill are proposed at 3:1 (horizontal to vertical). The existing <br /> Austin Road Landfill north slope is proposed at a 4:1 horizontal to vertical slope <br /> ratio. <br /> As shown on the final grading plan (Drawing 4), the existing Forward and Austin <br /> Road Landfills are proposed to be joined along the northern boundary of the <br /> existing Forward Landfill. The area directly north of Waste Management Unit <br /> (WMU) A at the existing Forward Landfill will not be filled because WMU A is a <br /> closed hazardous waste cell. Refuse fill will not be placed over the existing <br /> leachate risers for WMUs D-89 and D-93 at the existing Forward Landfill to <br /> maintain continued access to these riser pipes and also to future leachate risers <br /> that will be constructed in this area. The remaining wedge area between the two <br /> existing landfills will provide approximately 8 million cubic yards of additional <br /> capacity when filled. <br /> The maximum elevation of the Forward Landfill will be approximately 200 feet <br /> amsl. This height is consistent with the permitted maximum height for the existing <br /> Forward Landfill. <br /> The peak elevation of the proposed deck area for the Forward Landfill is 200 feet <br /> amsl and from that point final deck grades slope down to 170 feet amsl in the area <br /> of the existing Austin Road Landfill (see Drawing 4). This grading configuration <br /> allows conformance with the height limit zoning plan contours for the Stockton <br /> Municipal Airport (see Figure 2). <br /> 5.2.4 FINAL COVER <br /> 5.2.4.1 REGULATORY DESIGN STANDARDS <br /> California final Cover Prescriptive Design Standard <br /> The minimum final cover standards for the Forward Landfill, as outlined in the <br /> closure and post-closure requirements for Class II landfills contained in 27 CCR, <br /> Section 21090 include: <br /> Forward Landfill JTD 5-5 <br /> I.:\Allied\2000.193\Reports\JTD-PCPCMP 02:Sec-5.0:5/24/02 <br /> Revision 1:0:/16,/02 <br /> BRYAN A.STIRRAT&ASSOCIATES <br />