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Consolidated Forward Inc. Landfill Page 21 Proposed as Part of the Project: The project sponsor has prepared a seismicity study for the site. If the potential maximum peak ground acceleration in the seismicity study is greater than that assumed in the preliminary design, the final project design analysis will make modifications needed to meet the factor of safety (determinations may be subject to the approval of the CIWMB and/or RWQCB). Impacts to the new liner and drainage system installed over the Austin Road Landfill will be monitored as appropriate based on any stipulations of the CIWMB and/or RWQCB. 57 (G.4) Proposed as Part of the Project: Overall reduction—or, in some cases, elimination or improvement—of slope instability at the project site can be achieved through the implementation of the seismic design measures designed to meet CCR Title 27. 58 (G.5) Proposed as Part of the Project: The applicant's Joint Technical Document references an erosion management plan that delineates various actions to minimize erosion and sedimentation, including appropriate construction, landscaping, and maintenance of graded slopes and subsurface drainage systems. As part of that plan, grading operations will be scheduled to avoid the rainy season and be implemented by interim engineering control measures. Before grading is stopped, slopes will be directed to carry runoff to areas where erosion and sedimentation can be controlled. Truck beds will be hosed down to reduce soil spillage on paved roads and wind-blown dust. Relocation of Littlejohn Creek could lessen the sedimentation potential to the creek. Completed cells will be stabilized by the planting and maintenance of drought - resistant grasses. This will inhibit wind and water erosion and maximize the fertility of the soil in order to facilitate revegetation. Temporary plantings, geofabric drapes, and erosion -preventing diversions of surface water will be constructed as appropriate on temporary slopes. Regular operational and post -closure monitoring of erosion control structures and plantings will be done for a minimum of five years. 59 Forward 1993 (B.5) Assessment of groundwater levels in monitoring wells shall be initiated within 24 hours following an earthquake event having a Modified Mercalli intensity of V or greater at the landfill. This will allow the water level database to be adjusted or seismic variations. In the event that anomalous water level changes are noted, a series of water quality sampling and testing events shall be initiated by the applicant in coordination with the RWQCB to detect an changes in water quality that may signify subsurface adjustments in landfill cells. 60 Forward 1993 (B.6)