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velocity of the waste, the period of the waste, period of the earthquake waves, an empirical non-linear response factor, and the duration of shaking. Based on the site specific earthquake response factors, a Maximum Horizontal Equivalent Acceleration (MHEA) is calculated and compared to the yield acceleration. If the MHEA is greater than the yield acceleration, then earthquake-induced displacement is indicated. If the yield acceleration is greater than the MHEA, then earthquake-induced displacement is not likely to occur. The ky value was then used to estimate dynamic displacement of the cover under dynamic conditions using the Bray and Rathje (1998) method, as necessary. The results of the analysis indicate that the calculated dynamic displacement of the landfill cover in less than 1 inch. The calculated displacement is significantly less than the 6 to 12 inches generally considered to be the maximum movement that a landfill cover system can accommodate without compromising the integrity of a landfill's environmental control systems (Seed and Bonaparte, 1992). The dynamic stability of the 2:1 slope below the proposed benches was also ® evaluated. To evaluate the dynamic response to the MHA event, a pseudo-static analysis was performed to solve for the horizontal site acceleration that would cause a factor of safety of 1.0. The acceleration was 0.34g. The slope was then analyzed for permanent dynamic displacement in accordance with the procedures described above by Bray and Rathje (1998) and Bray et. al. (1998). No dynamic displacement was calculated for this slope. In summary, the seismic stability analyses indicate that the earth-induced displacement of the landfill cover and 2:1 slope below the proposed 15-foot wide bench will be negligible under MCE loads. 3.6 DRAINAGE AND EROSION CONTROL 3.6.1 DRAINAGE CONTROL SYSTEM DESIGN The primary function of the Forward Landfill Stage IA drainage control system is to collect and convey storm water in a controlled manner to minimize erosion and infiltration of storm water into the refuse prism. The following sections describe the site hydrology and proposed drainage control features. Forward Landfill PFCPCMP 3-10 J:\Allied\Forward\2005.0051 Partial Closure\Partial Closure Plan\FL-sec3.doc:6/15/2005