ARCHIVED REPORTS_1989 - Laserfiche WebLink

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is also planned to screen landfill operations from Harney Lane. The proposed locations of soil stockpiles and screening berms are shown on Drawing 1. Stockpiles and screening berms will be placed as earthfill as described in the preceding section. 4.4 SURFACE DRAINAGE AND CONTROL FACILITIES The permanent drainage facilities within the landfill will have the capacity to carry peak flow from a 100 -year recurrence storm. Storm runoff volumes were calculated and the facilities shown on the draw- ings were sized using applicable design criteria from Manual for Storm Drain Desian (San Joaquin County, California). Surface runoff within the landfill and contributory run-on from the adjacent areas east of the landfill will be carried in perimeter ditches and discharged to the natural drainage swales along the south and west perimeters. Permanent perimeter berms will be constructed along the limits of the active module areas to divert surface water from the operations area. Initial lifts in each module will be constructed during dry weather months to prevent accumulation of runoff in the active fill module. All lifts within the module will be sloped at a minimum of 2 percent toward the perimeter to promote drainage. Advancement of the working face will be reversed, after the initial lift, to progress from the perimeter to the interior access road. Runoff within the module will be diverted from exposed refuse by constructing a berm in advance of the working face. The berm will be skewed to direct flow toward the adjacent module to be collected in the temporary storm drainage sump. Collected runoff will be pumped from the sump to the perimeter drain- age ditch. For Modules 1 through 6, the perimeter berm will be constructed a min- imum of one module ahead of the fill module. Where the change in flow • direction permits flow in the direction of perimeter berm con- PJ9 9390209A.00D 15