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-, <br />3. Disturbance of the terrain within the landscape Shall be kept to a <br />minimum so as not to disturb any unknown archeological materials. <br />4. All planning, any necessary site investigation, or data recovery Shall be <br />conducted by a professional archeologist. <br />9.10 Accessibility <br />Refer to Sections 9.11 B, C and D regarding treatment of materials. <br />Refer to Sections 9.3, 9.41 9.5, 9.6, 9.7 and 9.8 for additional <br />Standards and Criteria that may apply. <br />1. A three-step approach is recommended to identify and implement <br />accessibility modifications that will protect the integrity and historic <br />character of the property: <br />a. Review the historical significance of the property and identify <br />character -defining features; <br />b. Assess the property's existing and required level of accessibility; <br />c. Evaluate accessibility options within a preservation context. <br />2. Because of the complex nature of accessibility the Historic <br />Preservation Commission will review proposals on a case by case bases. <br />The Commission recommends consulting with the following document <br />which is available from the Commission office: <br />U.S. Department of the Interior, National Park Service, Cultural <br />Resources, Preservation Assistance Division; Preservation Brief 32, <br />"Making Historic Properties Accessible" by Thomas C. Jester and Sharon <br />C. Park, AIA. <br />9.11 Architectural Materials <br />A. General <br />The Historic Preservation Commission of South Bend and St. Joseph County <br />recommends that work proposed to the materials outlined in sections B, C and D <br />be executed with the guidance of a professional building materials conservator. <br />1. Removal of fallen materials from ponds, lagoons and waterways is <br />encouraged. <br />9 12 <br />