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• JON -29-96 02:54 PM 1051 RIVERSIDE DRIVE 219 288 6314 P.06 3. Alteration of existing or addition of new vegetation materials and features will be considered if they do not alter the basic concept of the historic landscape design. 4. Deteriorated or missing vegetation materials and features shall be replaced with materials that match the original in size, shape: color. forst and texture. 5. When replacement of vegetation materials or features is necessary, it should be based on physical or documentary evidence. 6. If using the same; vegetation material is not technically or economically feasible, then compatible substitute vegetation materials may be considered if they convey the same growth habit, form, foliage and bloom characteristics as the historic plant. 7. Existing healthy vegetation material shall be retained unless it is part of a later non -compatible design or is volunteer vegetation inconsistent with the original design. 8. Consideration for removal or existing healthy vegetation materials and • features will be given when it is in conflict with the original design intent of the landscape, such as when an important vista has become overgrown or when plants have grown out of scale with their intended purpose. 9. Maintenance of, removal of, and additions of vegetation materials and features should consider maintaining existing or intended vistas and spaces, screening intrusions, creating new spaces wvhere appropriate and maintaining defined areas of shade and sun. 10. Invasive vegetation shall be removed whenever technically feasible and shall be replaced with appropriate vegetation consistent -'7th the original design of the park and with current factors such as security. ecological conditions and wildlife management practices. 1 l . Hazardous plants or portions of plants should be removed promptly. 12. Plants with diseases that are difficult or not practical to control or cure should be removed promptly to prevent their infection of ether plants. 13. Mutilated or distorted plants should be removed. 14 Plant replacements should be added on a schedule that .'ill assure a continuity in the landscape design.