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<br />I'IIr SNYDER <br />IIf' LANGSTON <br /> <br />December 12, 2006 <br /> <br />Mr. David DiRienzo <br />President <br />URBAN + WEST <br />936 East Santa Ana Blvd. <br />Santa Ana, CA 92101 <br /> <br />RE: West End lofts, a Proposed 6 Story Commercial loft Oevelopment <br />320 West Fourth Street, Santa Ana, CA <br /> <br />David: <br /> <br />In regards to your proposed six story commerclallolt building and a "construction protection" plan for the <br />process to protect the historic properties adjacent to the Project from project-construction vibration, Snyder <br />langston would recommend a photographic survey of the conditions of the existing structures to document <br />existing design features both interior and exterior, The survey should be conducted by a firm that <br />specializes in the preservation of historic structures and would note any current visible structural issues <br />including existing stress cracking, seismic reinforcing, condition of wood and steel members, the condition <br />of the existing mortar, brick, roofing and glazing systems. Any significant architectural features would be <br />noted, and detailed in the survey. Horizontal and vertical controls would be established on the existing <br />structures, noting the conditions and alignment of the existing structures prior to construction. All of the <br />existing conditions would be identified and cataloged as a reference point to determine any building <br />movement, and to have a reference point to repair any cosmetic damage to the existing structures that <br />may have occurred during construction. <br /> <br />Concurrent with the photographic survey, limited exploratory work would be conducted aimed at <br />determining how the existing structures are built. The exploratory work would determine the depth and <br />location of the existing footings, the condition and adhesion value of the existing mortar, along with <br />the support for the existing floor and the roof systems. This information would be used to determine what <br />temporary support measures would be required (if any) to support the existing structures during <br />construction of the new buildings. Temporary support of the existing structure (if any) could include re- <br />pointing the masonry, Installation of temporary wall support system to brace off the existing walls during <br />construction, and shoring of the existing structures. Given the condition of the existing structure, the fact <br />that the demolished structure on the existing lot was originally built with a basement, and that and the lot <br />has remained partially excavated it is hoped that temporary support measures would be kept to a <br />minimum. Final determination of the extent of the temporary support for the existing structure should be <br />lelt to the structural engineer, working in concert with a historical preservation architect retained by the <br />owner. <br /> <br />Design of the new structure should take into account the existing condition and location of the two <br />adjacent structures and any temporary support measures necessary to minimize any damage to the <br />existing structures during construction. The design should take into account the effect of <br />vibration, excavation, access, and construction techniques on the existing structures, and every effort <br />should be made to negate any impact to the existing buildings. A firm specializing in <br />monitoring vibration caused by construction operations should be retained by the owner to develop a <br />testing regime that will monitor vibration caused by the construction activities. An acceptable threshold of <br />vibration should be established and the existing structures monitored during demolition, excavation, <br /> <br />Creating Value Through Leadership in Real Estate and Constructioll <br /> <br />8U1A5 <br /> <br />11962 Cowan,IJVine. California 92614- <br />Phone 949.863.9200 Fax 949.863.1087 <br />www.snvder-Ianoston.&om <br />