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SNYDER LANGSTON December 12, 2006 Mr. David DiRienzo President URBAN + WEST 936 East Santa Ana Blvd. Santa Ane, CA 92701 RE: West End Lofts, a Proposed 6 Story Commercial Loh Development 320 West Feurth Street, Santa Ana, CA David: In regards to your proposed six story commercial loft building and a "construction protection" plan for the process to protect the historic properties adjacent to the Project from project-construction vibration, Snyder Langston would recommend a photographic survey of the conditions of the existing structures to document existing design features both interior and exterior. The survey should be conducted by a firm that specializes in the preservation of historic structures and would note any current visible structural issues including existing stress cracking, seismic reinforcing, condition of wood and steel members, the condition of the existing mortar, brick, roofing and glazing systems. Any significant architectural features would be noted, and detailed in the survey. Horizontal and vertical controls would be established on the existing structures, noting the conditions and alignment of the existing structures prior to construction. All of the existing conditions would be identified and cataloged as a reference point to determine any building movement, and to have a reference point to repair any cosmetic damage to the existing structures that may have occurred during construction. Concurrent with the photographic survey, limited exploratory work would be conducted aimed at determining how the existing structures are built. The exploratory work would determine the depth and location of the existing footings, the condition and adhesion value of the existing mortar, along with the support for the existing floor and the roof systems. This information would be used to determine what temporary support measures would be required (if any) to support the existing structures during construction of the new buildings. Temporary support of the existing structure (it any) could include re- pointing the masonry, installation of temporary wall support system to brace off the existing walls during construction, and shoring of the existing structures, Given the condition of the existing structure, the fact that the demolished structure on the existing lot was originally built with a basement, and that and the lot has remained partially excavated it is hoped that temporary support measures would be kept to a minimum. Final determination of the extent of the temporary support for the existing structure should be left to the structural engineer, working in concert with a historical preservation architect retained by the owner. Design of the new structure should take into account the existing condition and location of the two adjacent structures and any temporary support measures necessary to minimize any damage to the existing structures during construction. The design should take into account the effect of vibration, excavation, access, and construction techniques on the existing structures, and every effort should be made to negate any impact to the existing buildings. A firm specializing in monitoring vibration caused by construction operations should be retained by the owner to develop a testing regime that will monitor vibration caused by the construction activities. An acceptable threshold of vibration should be established and the existing structures monitored during demolition, excavation, Creating Value Through Leadership in Reat Estate and Construction 77962 Cowan, Irvine, California 92fi74 ](~t.ty~ '~7~ Phone 949.863.9266 Fax 999.863.1987 ~1y ff'~M'F~ wwwsnvder-lanas[on.com