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Page # 4 <br />SEISMIC CONSIDERATIONS <br />Seismic Design Criteria (per USGS) <br />Seismic Design Code ASCE 7-05 <br />Latitude 33.7637 <br />Longitude -117.8771 <br />SRA at Short Period Ss 1.400 USGS <br />SRA at ls Period St 0.497 USGS <br />Soil Site Class D IBC 1613.5.2.. <br />Seismic Design Category SDC D USGS <br />Seismic Check Required (Ss k Yes IBC 1613.1 <br />0.4€, & SDC 2 D)? <br />ALTERATION LATERAL DESIGN 10% EXCEPTION CHECK <br />Weight of Proposed PV System <br />Area Dead Load Weight <br />PV System Weight 422 sf 3 psf 1266 lbs <br />Total Weight of PV System W(PV)1266 lbs <br />Weight of Roof on Existing B .tilding <br />Sum Area of MPs with PV 1241 sf <br />Portion of Roof Weight Area Dead Load Weight <br />Roof 1,241 sf 8.0 psf 9,930 lbs <br />Ceiling 1,241 sf 7.0 psf 8,688 lbs <br />Interior Walls Gop Ha10 564 sf 6.0 psf 3,382 lbs <br />Exterior Walls (Top Half)564 sf 18.0 psf 10,146 lbs <br />Net Weight of Roof Under PV W(exist)32,147 lbs <br />Check % Increase of Roof Weight / Seismic Shear Load <br />% Increase of DCR of Lateral 3.9%W(PV)/ W(exist)Increase Seismic Shear Load < 10%, -> [OK]Force Resisting System <br />Note: Seismic base shear is directly proportional to roof weight. <br />IBC Sect. <br />3404.4