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NPR -10-96 11:41 PM 1081 RIVERSIDE DRIVE 219 288 6314 • 9.3 Zbpogmphy (includes the Shape, Slope, ]Elevation, Contour of land.forxns and Ground Plane, etc.) Refer to Sections 9.2, 9.4, 9.t5, 9.8 9.9 and 9.10 for additional Standard and Criteria that may apply. , 1. All locations and items listed in 9.2.2 shall also apply to this section and shall be preserved. • 2. Original or later contributing topographical features shall be retained in their existing configuration and shall be maintained through proper drainage, access and erosion control, and recognized soil management practices. 3. Alteration of existing or addition of new topographical features will be considered if they do not alter the basic r concept of the historic landscape design. 4. Natural features (e.g. rock outcroppings) which are integrated into the landscape shall be treated as part of the overall design and shall be retained. 5. Deteriorated or missing topographical features shall be replaced with materials that match'the original in form, shape, color and texture. • - 6. When replacement of materials or features is necessary, it ' should be based on physical or documentary evidence. 7. If using the same material is not technically or economically feasible, then compatible substitute materials may may be considered. 8. Wherever appropriate, plant materials rather than structural materials should be used to solve erosion problems. Repair of the WPA island and slough stone construction projects is strongly encouraged. 9.4 Vegetation (includes Trees, Shrubs, Ground Covers, Hedges, Allees, Fields, Forests, Planting Beds, etc.) Refer to Sections 9.2, 9.3, 9.5, 9.7, 9.8, 9.9 and 9.10 for additional Standards and Criteria that may apply. 1. Refer to Section 9.2.2 for items within this section which shall be preserved. Also included in this section shall be the diverse w variety of trees, shrubs bushes and other vegetation which may or may not be indigenous to this region. Lists of such 0 P- 05