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(4) Most properties change over time; those changes that have <br />acquired historic significance in their own right shall be <br />retained and preserved. <br />(5) Distinctive features, finishes, and construction techniques or <br />examples of cra8smanship that characterize an HP shall be <br />preserved. <br />(6) Deteriorated historic features shall be repaired rather than <br />replaced. Where the severity of deterioration requires <br />replacement of a disfinctive feature, the new feature shall <br />match the old in design, color, texture and other visual <br />qualities and, where possible, materials. Replacement of <br />missing features shall be substantiated by documentary, <br />physical or pictorial evidence. <br />(7) Chemical or physical treatments, such as sandblasting, that <br />cause damage to the historic materials and shvctures, if <br />appropriate, shall be undertaken using the gentlest means <br />possible. <br />(8) Significant archeological resources affected by a project shall <br />be protected and preserved. If such resources must be <br />disturbed, mitigation measures shall be undertaken. <br />(9) New additions, exterior alterations, or related new <br />construction shall not destroy historic materials that <br />characterize the property.. The new work shall be <br />differentiated from the old and shall be compatible with the <br />massing, size, scale, and architectural features to protect the <br />historic integrity of the property and its environment. <br />(10) New additions and adjacent or related new construction shall <br />be undertaken in such a manner that if removed in the future, <br />the essential form and environment would be unimpaired,. <br />(c) In the case of archeological properties, the Architectural Board of <br />Review shall refer to the Advisory Council on Historic Preservation's <br />Treatment of Archeological Properties: A Handbook or successor <br />publication(s). <br />(d) Approval Not Self-executing Where the Commission has Issued <br />Unique Historic Guideliues: When Unique Historic Guidelines have <br />been established, if the proposed construction, reconstruction, alteration <br />or demolition is determined to have no adverse effect on the HPD or <br />the HP, and does not violate the spirit and purpose of these preservation <br />regulations, then the Architectural Board of Review shall approve the <br />Certificate of Appropriateness, subject to a final additional review by <br />the Commission. <br />(e) Denial If the Architectural Board of Review determines that the <br />proposed construction, reconstruction, alteration or demolition will <br />have an adverse effect on the HPD or HP and does violate the spirit and <br />purpose of these preservation regulations, then the Architectural <br />Review Board shall deny the Certificate of Appropriateness. <br />22 <br />