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halt all activities within 50 feet of the discovery, and the construction contractor shall notify the City. Prehistoric archaeological materials might include obsidian and chert flaked -stone tools (e.g., projectile points, knives, scrapers) or toolmaking debris; culturally darkened soil ("midden") containing heat -affected rocks, artifacts, or shellfish remains; stone milling equipment (e.g., mortars, pestles, handstones, or milling slabs); and battered stone tools, such as hammerstones and pitted stones. Historic -period materials might include stone, concrete, or adobe footings and walls; filled wells or privies; and deposits of metal, glass, and/or ceramic refuse. The project developer shall ensure that a Secretary of the Interior -qualified archaeologist will inspect the findings within 24 hours of discovery. If the archaeologist determines that construction activities could damage a historical resource or a unique archaeological resource (as defined pursuant to the CEQA Guidelines), mitigation will be implemented in accordance with Public Resources Code (PRC) Section 21083.2 and Section 15126.4 of the CEQA Guidelines, with a preference for preservation in place. Consistent with Section 15126.4(b)(3), this may be accomplished through planning construction to avoid the resource; incorporating the resource within open space; capping and covering the resource; or deeding the site into a permanent conservation easement. If avoidance is not feasible, a qualified archaeologist will prepare and implement a detailed treatment plan in consultation with the City. Treatment of unique archaeological resources shall follow the applicable requirements of PRC Section 21083.2. Treatment for most resources would consist of (but would not be not limited to) sample excavation, artifact collection, site documentation, and historical research, with the aim to target the recovery of important scientific data contained in the portion(s) of the significant resource to be impacted by project construction. The treatment plan will include provisions for analysis of data in a regional context, reporting of results within a timely manner, curation of artifacts and data at an approved facility, and dissemination of reports to local and state repositories, libraries, and interested professionals. Site(s) affected: All sites within the proposed Zone. (Draft SEIR, pp. 4.E-17 to 4.E-19.) Impact 4.E -2c Development facilitated by the proposed Zone may directly or indirectly destroy a unique paleontological resource or site or unique geologic feature. The SEIR evaluates the impacts of the proposed Zone related to the potential destruction of unique paleontological resources or a unique geologic feature. Significance Before Mitigation: Significant Significance After Mitigation: Less than Significant 32