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r <br /> Phases 3 through 7 will be constructed (from west to east) to the south of and <br /> over the existing Austin Road Landfill within an existing borrow area. The <br /> existing scalehouse facilities will be relocated easterly near the existing site <br /> offices during fill sequencing for Phase 7. The future scales/scalehouse facilities <br /> will serve Phase 8 located in the northeast corner of the site and Phase 9'which <br /> will close the gap between the two existing landfill prisms. Phase 9 fill <br /> sequencing will proceed from west to east over Phases and 2. Phase 10 <br /> located at the south side of the South Branch will be the final fill sequence <br /> 5.2.6 DRAINAGE <br /> Surface water control includesprotectionof the landfill from surface water run-on <br /> and flood influence by Little Johns Creek as well as proper handlingofiudace <br /> water runoff from the landfill areas. <br /> The surface drainage plan for the Forward Landfill is shown on Drawing 9 and <br /> drainage details are shown on Drawing 7. The drainage control facilities include a <br /> network of top deck diversion° sand inlets;°-dawn drains, perimeter-channels <br /> and beach drains for managing surface water runoff. A brief description of the <br /> drainage facilities are discussed in the following sections. <br /> 5.2.6.1 ON-SITE DRAINAGE CONTROL <br /> Permanent storm water runoff and drainage control facilities on site were designed <br /> to carry the peak discharge resulting from a 1,000-year; 24-hour storm event, as <br /> required by 27 CCR, Section 20320 for a Class 11 waste management:unit. A <br /> discussion of the design calculations is presented in Section 5.3.5. The drainage <br /> network for the completed landfill is designed to carry storm water,at,velocities <br /> that will control run-off and minimize erosion. <br /> The Forward Landfill surface water control plan consists of an integrated system of <br /> bench ditches, perimeter channels, top deck perimeter berms, and storm water <br /> sedimentation basins (shown on Drawings 7 and 9). The final landfill grades are <br /> designed so that surface water will run off the landfill via sheet flow until <br /> intercepted by a deck berm or bench ditch. The bench ditches subsequently drain <br /> toward trapezoidal AC down drains or corrugated steel pipes which discharge to <br /> perimeter channels. Finally, the perimeter channels drain to a stormwater <br /> sedimentation basin. <br /> Forward Landfill JTD 5-9 <br /> L:\AII ied\2000.193\Reports\fiinaljtd:Sec-5.0:08/2 2/01 <br /> c�ovnN A QTO�AT n efc4f7c1ATEf <br />