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�J <br />Near the closure of the site of landfill development, stockpiling may occur on the top deck of <br />previously constructed modules that have been filled to interim heights. <br />The County may offer soil for sale if it is determined that the site has excess soil. However, at <br />this time, excess soil is not anticipated at this time. <br />6.3.2. Base Preparation/Liner Placement Plans <br />Each module is separately designed and submitted for approval based on the requirements of the <br />state regulations and current permit (Waste Discharge Requirements). The general module <br />locations and fill limits are shown on Plate 5; however, the County may revise the size, location, <br />and numbering of the modules as beneficial to the development of the landfill. Bottom grades <br />used in the volume calculations were based on the base grades of 230 ft MSL. The County <br />assumed an operations layer 2 feet thick. <br />The base of each module will be graded to gravity drain to a dedicated sump, from which <br />leachate will be extracted. The dedicated sump for each module will be located on the side of <br />the module that forms the perimeter boundary of the fill footprint. This will allow access to the <br />leachate sump via a side slope leachate riser. <br />6.3.3. Fill Sequencing Plans <br />Currently refuse is being placed in Module 1. Current sequencing plans are to fill Module 1 to <br />near final maximum permitted elevation. The next module will be constructed in advance of <br />Module 1 reaching its permitted refuse fill capacity. Once this next module is approved for <br />disposal by the appropriate regulatory agencies, refuse fill operations will begin. This process <br />will be repeated for the remaining Modules. <br />The current plan for module development is in numerical order (Plate 5); however, the County <br />will develop modules based on engineering and economic evaluations. At this time, the County <br />is evaluating parts of Module 9 and 10 as the next module. <br />Foothill Sanitary Landfill <br />JTD <br />Page 34 of 62 Public Works/Solid Waste <br />County of San Joaquin — Revised 10/6/05 <br />