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5.0 DISPOSAL SITE DESIGN <br /> 5.1 INTRODUCTION <br /> The following section describes the proposed disposal site design features for the <br /> Forward Landfill, including the refuse fill areas, surface water drainage control <br /> system, leachate control and removal system, and the landfill gas <br /> control/recovery systems,. All of the environmental control systems have and will <br /> be installed to protect the environment and to comply with applicable,regulatory <br /> requirements. This,section,also includes,supporting design calculations for the <br /> Forward Landfill. <br /> 5.2 DESIGN PLANS <br /> All of the engineering design plans presented in this JTD are conceptual in nature <br /> and have been prepared using acceptable engineering practices. Detailed <br /> design plans wifl-be,pTepared for the vaTiotmimprovements',and phas-esof <br /> development prior to construction. Any changes of substance proposed in <br /> detailed design plans will be reflected in an amendment to the JTD and <br /> submitted to the LEA, CIWMB and RWQCB. The Forward Landfill has been <br /> designed under the directive of a registered civil engineer in accordance with <br /> applicable stateand federal regulations and-as requited in 27 CCR,,Sectioti <br /> 20310. <br /> 5.2.1 LOWER BASE GRADES IN FUTURE WASTE MANAGEMENT UNITS <br /> The base grading plans for future permitted WMUs at the existing Austin Road <br /> Landfill depict a minimum base elevation of approximately 20 feet amsL The <br /> Waste Discharge Requirements (WDRs) for the existing Forward Landfill state that <br /> wastes may not be discharged below an elevation of 7 feet amsi. Forward is <br /> proposing to lower the base grades in the future permitted WMUs at the existing <br /> Austin Road Landfill to be consistent with those currently permitted at the existing <br /> Forward Landfill as shown on Drawing 3. <br /> Forward's WDRs also require a minimum 5-foot separation between wastes or <br /> leachate and the highest anticipated elevation of underlying groundwater, <br /> including the capillary fringe. Current groundwater elevations fluctuate seasonally <br /> Forward Landfill JTD 5-1 <br /> L:\Allied\2000.193\Reports\finaljtd:Sec-5.0:08/22/01 <br /> BRYAN A.STIRRAT&ASSOCIATES <br />