SU0015801 - Laserfiche WebLink

Home Browse Search

4 Environmental Analysis 4.13 Noise Table 4.13-6. Received Construction Equipment Noise Levels by Stage (dBA Leq, Lmax) CoordinatesUTM (meters) Distance to Construction Noise Levels Center of Stage 1 Stage 2 Stage 3 Stage 4 Stage 5 Participation Construction NSA-1 Non- 628459 4176119 6,075 52 56 52 57 47 51 46 49 14 18 participant NSA-2 Non- 627076 4174143 1,850 62 67 62 68 57 62 56 59 24 28 participant NSA-3 Non- 627580 4175135 1,850 62 67 62 68 57 62 56 59 24 28 participant NSA-4 Non- 627733 4175104 1,975 62 66 62 67 57 61 56 59 24 28 participant NSA-5 Non- 628927 4175671 6,125 52 56 52 57 47 51 46 49 14 18 participant NSA-6 Participant 627115 4174455 1,025 68 72 68 73 62 67 61 64 30 34 NSA-7 Participant 627139 4174478 925 68 73 69 74 63 68 62 65 30 34 NSA-8 Participant 627122 4174991 1,550 64 68 64 69 59 63 58 61 26 30 NSA-9 Participant 627146 4174731 900 69 73 69 74 64 68 62 66 31 35 NSA-10 Non- 626174 4174293 4,125 56 60 56 61 50 55 49 52 18 21 participant NSA-11 Non- 627422 4175128 1,700 63 67 63 69 58 62 57 60 25 29 participant Noise levels resulting from the construction activities would vary significantly depending on several factors such as the type and age of equipment, specific equipment manufacture and model, the operations being performed, and the overall condition of the equipment and exhaust system mufflers. Project construction would occur between 7:00 a.m. and 7:00 p.m., in compliance with the County's Code. Although the County's ordinance may exempt daytime construction noise from the County's typical noise requirements, construction noise may still be considered an impact under CEQA. The FTA has published construction noise impact criteria levels of an 80 dBA 8-hour Leq for the day and a 70 dBA 8-hour Leq for the night for residential land uses. Table 6 shows that the highest construction noise levels at a non-participating receptor will be 63 dBA Leq and 69 dBA Lmax at NSA-11. This level is below the FTA guidance level of 70 dBA Leq and is within the range of measured ambient Lmax values published in The San Joaquin County 2035 General Plan EIR, which show an Lmax ranging from 51-66 dBA during the morning, 58-78 dBA during the afternoon, and 47-68 dBA during the night. Due to these circumstances, the temporary increase in noise due to construction is considered to be a less than significant impact. As shown above, the noise generated from the construction of the Project would not generate a significant impact. However, since construction machines operate intermittently, and the types of machines in use at the Project site change with the stage of construction, noise emitted during construction would be mobile and highly variable. Therefore, to help minimize noise impacts, the Project's construction management protocols would implement the following best practice noise reduction design measures: Griffith Energy Storage Project 4.13-11 Tetra Tech/2022120675 Draft Environmental Impact Report August 2023