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5.0 Environmental Setting 5.3 Cultural/Historical Resources Avion Project SEIR Page 5.3-10 5.3.4 Issue 1: Prehistoric/Historic Resources • Would the project result in an alteration, including the adverse physical or aesthetic effects and/or the destruction of a prehistoric or historic building (including an architecturally significant building), structure, or object or site? 5.3.4.1 Threshold The City has developed Significance Determination Thresholds to assist staff, project proponents, and the public in determining whether, based on substantial evidence, a project may have a significant effect on the environment, per CEQA Guidelines Section 21082.2 and, therefore, the environmental impact requires mitigation. The City’s Significance Determination Thresholds for analyzing impacts to historical resources describe three kinds of impacts to historical resources: direct, indirect, and cumulative. Direct impacts generally result from activities that would cause damage to or have an adverse effect on the resource. Indirect impacts (primarily for built environment resources but also applicable to archaeological resources) include the introduction of visual, audible, or atmospheric effects that are out of character with the historic property or alter its setting, when the setting contributes to the property’s significance. For archaeological resources and traditional cultural properties, indirect impacts are often the result of increased public accessibility to resources not otherwise subject to impacts that may result in an increased potential for vandalism and site destruction. Cumulative impacts can result from individually minor but collectively significant projects taking place over a period of time. According to the City’s Historical Resources Guidelines, the loss of a historical resource database due to mitigation by data recovery may be considered a cumulative impact. In the built environment, cumulative impacts most often occur to districts, where several minor changes to contributing properties, their landscaping, or to their setting over time could result in a significant loss of integrity to the district as a whole. Based on the current City of San Diego’s Significance Determination Thresholds, historical resource impacts may be significant if the project would affect any of the following: • A resource listed in, eligible or potentially eligible for listing in the NRHP. • A resource listed in, or determined to be eligible by, the State Historical Resources commission, for listing in the CRHR (Public Resources Code [PRC] Section 5024.1). • A resource included in a local register of historical resources, as defined in Section 5020.1(k) of the PRC, or identified as significant in an historical resource survey meeting the requirements of Section 5024.1(g) of the PRC. • Any object, building, structure, site, area, place, record, or manuscript which a lead agency determines to be historically significant or significant in the architectural, engineering, scientific, economic, agricultural, educational, social, political, military, or cultural annals of California, provided the lead agency’s determination is supported by substantial evidence in light of the whole record. Generally, a resource shall be considered by the lead agency to be