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4.10 cultural Resources IN. 4.10.3 Impacts and Mitigation Measures This section describes the criteria used to determine if significant impacts would occur, the types ` of project-related actions and design elements that could result in significant impacts on important cultural resources,a description of identified potential impacts,and the identification of feasible mitigation measures that would reduce potential impacts to a less-than-significant level. Significance Criteria ` According to the CEQA, a project with an effect that may cause a substantial adverse change in the significance of an historical resource is a project that may have a significant effect on the environment(CEQA rev. 1998 Section 15064.5(b)). CEQA further states that a substantial adverse change in the significance of a resource means the physical demolition,destruction, relocation, or alteration of the resource or its immediate surroundings such that the significance of an historical resource would be materially impaired. Actions that would materially impair the significance of a historic resource are any actions that would demolish or adversely alter those physical characteristics of an historical resource that convey its historical significance and qualify it for inclusion in the California Register of Historic Resources (CRHR)or in a local register or survey that meet the requirements of Sections 5020.1(k) and 5024.1(g)of the Public Resources Code. Impact Mechanisms Impacts on cultural resources could result from the following project-related activities or project design elements: Ground-disturbing activities.Project-related excavation, grading,trenching,or other sub- surface disturbance could damage or destroy buried archaeological resources including prehistoric and historic remains or human burials. Impact 4.10.1: Damage to previously unidentified buried archaeological remains during project construction.(Potentially significant) Unidentified,buried archaeological remains could be present in the project site. Buried archaeological remains such as prehistoric midden deposits, flaked and ground stone artifacts, bone, shell,building foundations and walls, and other buried cultural materials could be damaged I.. during excavation,grading, trenching, and other construction related activities. Damage to significant buried archaeological remains would be a significant impact. To reduce this impact to a less-than-significant level,implement Mitigation Measures 4.10.1. r. Mitigation Measure Measure 4.10.1: Stop work if cultural resources are discovered during project construction. If potentially significant cultural resources are discovered during ground- disturbing activities associated with project preparation, construction,or completion, work .. shall halt in that area until a qualified archaeologist can assess the significance of the find, RMC Pacific Vernalis quarry Mining and Reclamation Project 4.10-5 ESA 1213015 Draft Environmental Impact Report May 2006