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RET: Stability of Retaining Wall under Seismic

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I remembered that this may be posted on this list before but I'd like to refresh my memory on this issue.

Question:  What factor of Safety should be (1.5 or 1.0) when one is checking the stability of a Retaining Wall (12'-6" Ht retained) Footing for 1.0xActive + 1.0xSeismic Increment (26pcf x Depth)? 

TIA,

John Nguyen