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• Sunken Garden, and the footbridge from the mainland to the island. Alteration or addition of Roads, Paths, Parkways, Trails, Walks, etc. shall be based upon physical or historical documentation of these items as they existed from 1910 to 1940. 2. Original or later contributing layouts of walks, roads and paved areas shall be retained and maintained. 3. Alteration of existing or addition of new circulation layouts will be considered if it can be shown that better site circulation is necessary and that the alteration does not alter the basic concept of the historic landscape design. 4. When replacement of circulation layouts is necessary, it should be based on physical or documentary evidence. 5. Original or later contributing circulation materials and features shall be retained and, if necessary, repaired by patching, piecing -in or reinforcing the material or feature using recognized preservation methods. 6. Deteriorated or missing circulation materials and features shall be replaced with materials that match the original in size, shape, color, profile, form, texture and detail of installation. 7. If using same material is not technically or economically feasible, then compatible substitute materials may be considered. 8. Alteration of existing or addition of new circulation materials and features will be considered if they do not alter the basic concept of the historic landscape design. 9. Consideration will be given to an alternate paving material if it can be shown that its properties will improve the original or later contributing design concept. 10. When replacement of circulation materials or features is necessary, it should be based on physical or documentary evidence. 11. Consideration for removal of existing circulation systems and features will be given when it is conflict with the original design intent of the landscape or when they are no longer appropriate to their intended purpose. 0 7