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Less Than Significant After No River Reduced Depth Alternate Quarry Potentially Significant Impacts Suggested Mitigation Measures Mitigation? No Project Crossing of Excavation Site Noise Noise emissions from aggregate extraction The loader,haul trucks,and any other heavy Yes No Impact Similar Impact Similar Impact Similar Impact equipment and haul trucks operating in the equipment shall be fitted with state-of-the-art proposed quarry area could impact sensitive noise shielding and muffling devices. receptor. Noise generating activities shall be avoided between 7 p.m.and 7 a.m,when they would be most disruptive. Excavation shall be prohibited on weekends and holidays except during emergency situations. Noise level monitoring shall be conducted at the nearest residences when extraction activities approach approximately 300 feet of the bluff. If noise monitoring indicates that noise levels exceed 65 dB Ldn at the property line,then further noise mitigation shall be implemented. This could include not allowing any extraction activity beyond the point at which the noise effects occur. Mitigation shall also be required if noise monitoring indicates an increase of approximately seven dBA,or more over ambient levels at the nearest residence and the resident complains about the noise. Public Services No impacts to Public Facilities were identified. N.A. N.A. N.A. N.A. N.A. N.A. Land Use Use of the proposed site for resource extraction See mitigations for'Noise'and'Visual Yes No Impact Similar Impact Reduced Impact Reduced Impact would, without mitigations, be a long-term use Resources' that would be incompatible with the existing residential and commercial uses due to noise and visual impacts. Visual Resources Excavation shall occur in strips,approximately Yes No Impact Similar Impact Reduced Impact Reduced Impact Extraction activities at the quarry site would 200 feet wide,and shall not exceed 5.5 acres in visually impact portions of the town of area. Once excavation of a strip is complete,it Clements which lie above the project site. shall be immediately resoiled and revegctated. A temporary resoiling and revegetation plan shall be submitted to and approved by the County and the U.S.Soil Conservation Service prior to commencement of project operation. The haul route from the excavation site to the Mokclumne River shall be screened with trees and other vegetation. A plan for the vegetation shall be submitted to and approved by the County prior to project operation.