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Draft Environmental Impact Report Page II-23 Forward Inc. Landfill Expansion system integrity, causing approval of the CIWMB and/or RWQCB). Impacts to the new liner and slope instability, damage drainage system installed over the Austin Road Landfill will be monitored as to drainage features,or. appropriate based on any stipulations of the CIWMB and/or RWQCB. differential settlement of the landfill over the life No additional measures are required. of the project, or following closure. G.3. Slope instability Proposed as Part of the Project: Less than caused by an earthquake Significant could result in damage to Overall reduction—or, in some cases, elimination or improvement—of slope existing and proposed instability at the project site can be achieved through the implementation of the landfill administrative seismic design measures designed to meet CCR Title 27. facilities, scale house, groundwater treatment No additional measures are required. system, composting storage, and support facilities. G.4. Increased erosion Proposed as Part of the Project: Less than and sedimentation could Significant occur,particularly The applicant's Joint Technical Dgcument(2007) section 7 references an erosion- during rosionduring the construction control plan that delineates various actions to minimize erosion and phases of the landfill, sedimentation, including maintaining the effectiveness of the surface drainage due to grading and control structures by keeping drainage ditches clear of debris and excessive borrow soil excavation vegetation and by making repairs,as necessary,to correct the effects of physical and transport operations. damage, erosion,settlement, or other events detrimental to effective operation of the drainage control system,and appropriate construction, landscaping, and maintenance of graded slopes and subsurface drainage systems. As part of that plan, grading operations would be scheduled to avoid the rainy season and be implemented by interim engineering control measures. Before grading is stopped, slopes would be directed to carry runoff to areas where erosion and sedimentation can be controlled. Truck beds would be hosed down to reduce soil spillage on paved roads and wind-blown dust. Relocation of Littlejohns Creek could lessen the sedimentation potential to the creek. ` + :l �Qv ow �Qw aft, AM O 4M [MV ~fes , ! ,'