Laserfiche WebLink
San Joaquin County Community Other CEQA Considerations <br /> Development Department <br /> Noise <br /> Impact CE-7: Exposure of Noise-Sensitive Land Use to <br /> Cumulative Noise Levels in Excess of County Standards <br /> (Cumulatively Considerable) <br /> Total cumulative noise levels due to combined noise from mining operations, <br /> Project-related traffic,and background traffic were assessed for the two <br /> operational conditions that could occur with implementation of the proposed <br /> Project. This includes normal operational hours between 5:00 a.m. and 9:00 p.m. <br /> and 24-hour operations,which could occasionally occur for brief periods to <br /> supply materials for nighttime road improvement project. <br /> Tables 5-10 through 5-15 summarize the cumulative modeling results for Project <br /> conditions and compares them to No-Project conditions. Locations where <br /> cumulative noise levels are predicted to exceed 65dB-Ldo are noted. Depending <br /> on the operational condition,these locations include prediction locations P-Nl, <br /> P-N2,P-N3,P-N5,P-N7,P-W3, and P-El. <br /> Because the proposed Project is predicted to contribute to conditions under which <br /> _ noise is predicted to exceed 65 dB-L& at residences, the proposed Project is <br /> considered to contribute to significant noise impacts. Implementation of <br /> Mitigation Measure N-2 will reduce this impact,but not to a less-than-significant <br /> level. The proposed Project is therefore considered to contribute to a <br /> cumulatively considerable noise impact. <br /> Table 5-1. Predicted Cumulative Mining and Traffic Noise Levels, Mining Equipment Operating at North <br /> Pit Stage 1,with Mine Operating Hours between 5:00 a.m. and 9:00 p.m. <br /> Mining Equipment Operating at Mining Equipment Operating 30 <br /> r 2027 No-Project Existing Ground Level Feet below Existing Ground Level <br /> Receiver Sound Level, Sound Level, Increase over Sound Level, Increase over <br /> Name dBA La dBA Ld„ No-Project,dB dBA Ld„ No-Project,dB <br /> r P-N 1 64 64 0 64 0 <br /> P-N2 69 70' 1 69' 0 <br /> P-N3 68 69' 1 69" 1 <br /> P-N5 67 68' 1 68• 1 <br /> P-N6 56 60 4 59 3 <br /> P-N7 62 63 1 63 1 <br /> P-N8 59 61 2 61 2 <br /> P-W 1 53 58 5 56 3 <br /> ` P-W2 53 57 4 56 3 <br /> P-W3 52 58 6 56 4 <br /> P-EI 54 64 10 60 6 <br /> r • Cumulative noise is predicted to exceed 65 dB-Lm. <br /> DeSilva Gates Quarry Project <br /> Draft Environmental Impact Report 5-7 <br /> J&a 05105.05 <br />