11 - Laserfiche WebLink

may contain unknown archaeological resources,the disturbance of which could therefore cause a substantial adverse change in the significance of a unique• archaeological resource pursuant to §15064.5 of the CEQA Guidelines. Significance Before Mitigation: Significant Significance After Mitigation: Less than Significant Finding: Changes have been incorporated into the Project that would avoid the significant environmental effect as identified in the Revised Final SEIR. Mitigation Measure 4.E-5, which has been incorporated into the Project, will reduce the significant environmental impact to a less than significant level. Facts in Support of Finding: The following facts and mitigation measure indicate that the impact will be reduced to less than significant. 1. The Project is located in Holocene-aged alluvial deposits, a geologic formation that has a high potential for buried archaeological resources. Previous disturbance from the channelization of Alamo Creek, construction of the I-680 and 1-580 freeways, and existing development throughout the area of the Project indicates that any sensitivity for buried prehistoric archaeological resources in the area has been significantly reduced; however, unknown archeological resources may be present underground within the area of the Project. 2. Implementation of Mitigation Measure 4.E-5 set forth in Table 5-1 of the Final SEIR and listed in the RMMRP will ensure that Impact 4.E-2b would be reduced to a less than significant level and is hereby incorporated by reference and described below. Mitigation Measure 4.E-5: Archeological Resources. If prehistoric or historic- period archaeological resources are encountered during ground disturbing activities for a project under construction within the EDZ,the construction contractor shall 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 25