Benicia Capitol Exterior Restoration

Benicia Capitol Exterior Restoration

Clean the exterior brick and mortar surface of the Capitol building at Benicia Capitol State Historic Park with a combination chemical rinse/low pressure water wash to remove any loose paint. Mechanically remove one inch of deteriorated mortar and re-point. Extent of re-pointing will be identified by the architect prior to the start of construction but is not expected to exceed 10% of the building surface. Repair spalling lintels and exterior sills where failure has occurred. Repaired lintels and sills to match existing non-spalling units. Apply consolidant to the exterior brick and sandstone lintels/sills and watertable. Remove and replace any loose window glazing compound. Replace the deteriorated existing stairs. The exposed surfaces will be replaced along with any of the support structure that is found to be deteriorated beyond usable condition. Exposed surfaces will match the appearance of the existing non-historic surfaces. The structural supports are not visible. The non-historic members shall be replaced using current construction methods. Historic structural members requiring replacement are very limited and shall be replaced with Douglas fir of similar dimensions to the damaged member. Remove soil from around the perimeter of the building approximately 2 feet out and 2 feet down. This soil is considered contaminated and will be disposed of at a certified landfill. Re-landscape flower beds with clean imported fill. In addition, an area approximately 40 feet by 90 feet of top soil below the lawn area between the planter bed and First Street may be contaminated. If this area is found to be contaminated, remove the top 4 to 6 inches of the soil and dispose at a certified landfill; replace removed soil with clean fill. To avoid release of lead particles (airborne and otherwise) during removal of contaminated soil and paint, disturbance with applicable state, federal, and local regulations (e.g. 8 CCR 1532.1 and 17 CCR 35001-36100). Project and construction managers shall: (1) consult with the DPR district historian before and during the proposed work to ensure that the project follows accepted preservation treatment guidelines for historic brick, masonry, sandstone, wooden windows, flat plaster, and installation of replacement non-historic steps; and (2) notify the DPR district archaeologist at least one week before removing soil around perimeter of building, so that he may monitor removal of soil and record information about any archaeological features, should they be present.

Benicia

Solano