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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, structures, 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 oftheproperty 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 azcheological properties, the Architectural Board of <br />Review shall refer to the Advisory Council on Historic Preservation's <br />Treatment of Archeological Pronerties A Handbook or successor <br />publication(s), <br />(d) Approval Not Self-executing Where the Commission has Issued <br />Unique Historic Guidelines: If the proposed construction, <br />reconstruction, alteration or demolition is determined to have no <br />adverse effect on the HPD or the HP, and does not violate the spirit and <br />purpose of these preservation regulations, then the Architectural Board <br />of Review shall approve the Certificate of Appropriateness, subject to a <br />final additional review by the Commission, whenever Unique Historic <br />Guidelines have been established. <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 />(f) Notice of Denial to Applicant: In the event that the Architectural <br />Board of Review denies an application for a Certificate of <br />Appropriateness, the Secretary of the Architectuml Boazd of Review <br />shall forthwith notify the applicant of such determination in writing and <br />transmit to him/her a copy of the reasons for denial and <br />recommendations, if any, of the Architectural Boazd of Review. <br />(g) Effect of Denial: Upon denying an application for a Certificate of <br />Appropriateness, the Architectural Board of Review shall impose a <br />waiting period to not exceed thirty (30) days from the date of <br />disapproval during which the applicant may develop a compromise <br />proposal. With respect to an application involving a demolition, the <br />