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CX-005113: Categorical Exclusion Determination

Stanford Synchrotron Radiation Lightsource Seismic Upgrade Phase 2
CX(s) Applied: B2.5
Date: 01/24/2011
Location(s): California
Office(s): Stanford Linear Accelerator Site Office

The Stanford Synchrotron Radiation Lightsource (SSRL) is proposing to upgrade a portion of the existing Stanford Positron-Electron Asymmetric Ring (SPEAR) to meet seismic standards. The proposed work includes : 1) the replacement of concrete roof blocks, placement of footings and new concrete walls, and installation of seismic connections at the old Beam Line 4; 2) the replacement of existing concrete roof blocks with precast roof blocks, placement of new footings, and installation of seismic anchors and connections at the northeast section of the Booster ring; 3) the installation of seismic anchors between the existing walls and roof blocks of the Booster Ring (both north and south of Building 140); 4) the installation of steel tube diagonals to create braced frames on the east and west sides of Building 140; and 5) the replacement of tension rods under the roof of Building 140.