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z JCLH-29-96 03:06 PM 1081 RIVERSIDE DRIVE 219 288 6914 P-11 �J • 0 5. If using the same material is not technically or economically feasible, then compatible substitute materials may be considered. G. Cleaning of metal elements either to remove corrosion or deteriorated paint shall use the mildest method possible. 7. Abrasive cleaning methods, such as low pressure dry ,grit blasting, may be allowed as long as it does not abrade or damage the surface. $. A test patch of the cleaning method(s) shall he reviewed and approved on site by staff of the Boston Landmarks Commission. Test patches should always be carried out well in advance of cleaning (including exposure to all seasons if possible). 9. Cleaning to remove corrosion and paint removal should be considered only where there is deterioration and as part of an overall maintenance program which involves repainting or applying other appropriate protective coatings. Paint or other coatings help retard the corrosion rate of the metal, Leaving; the metal bare will expose the surface to accelerated corrosion. 10. Repainting should be based on paint striation studies. If an adequate record does not exist repainting shall be done with colors that are appropriate to the style and period of the building. The Landscapes - Specific Standards and Criteria has been financed in part with fbnds from rhe National Part: Service, U.S. Milart,nent of the Interior, through the Massachusetts Historical Commission, Secretary of State Michael Joseph Connolly, Chairman. The U.S. Department of the Interior prohibits discrimination on the basis of race, color. national origin, age, gender, or handicap in ifs federally assisted programs_ fryou believe you have been discriminated against in any program, activiq• or facility as described above, or if you desire further information, plca%(.- write to: Orrice for Equal Opportunity, 1849 C Street NW, Room 1324, U.S. Department of the Interior, Washington, D.C. 20240.