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City of Santa Ana Environmental Checklist Article IV, Section 18-312 & 18.313 of the City's Municipal Code specifies permitted noise levels for day and night time exterior and interior noise levels. Exterior and interior noise thresholds within the City are presented in Table 3-13 below. In the event the alleged offensive noise consists entirely of impact noise, simple tone noise, speech, music, or any combination thereof, each of the above noise levels shall be reduced by five (5) dB(A). However, in the event the ambient noise level exceeds either of the first two (2) noise limit categories above, the cumulative period applicable to said category will he increased to reflect said ambient noise level. In the event the ambient noise level exceeds the third noise limit category, the maximum allowable noise level under said category will be increased to reflect the maximum ambient noise level. Article IV, Section 18-314 of the City's Municipal Code specifies permitted flours for construction activities. Noise associated with construction of any real property is exempt provided that it does not occr between the howl of 8:00 p.m, and 7:00 a.m. on weekdays, including Saturday, or any time on Sunday or a federal holiday. Table 3-13. City of Santa Ana Permitted Noise Levels Noise Zone (1) Noise Level Time Period Exterior Noise Thresholds 55 dB(A) 7:00 a.m.-10:00 p.m. 50 dB(A) 10:00 p.m.- 7:00 a.m. interior Noise Thresholds 55 dB(A) 7:00 a.m.-10:00 p.m. 45 dB(A) 10:00 p.m.- 7:00 a.m. Would the project: a. Expose persons to orgenerate noise levels in excess of standards established in the local general plan or noise ordinance, or applicable standards of other agencies? Less-than-Significant Impact with Mitigation Incorporated. Impacts related to construction and operation of the proposed project are discussed separately below. Construction Construction of the proposed project is anticipated to take approximately 19 months to complete. The proposed project would consist of various phases of activities over the construction period. Construction phases are listed in Table 3-14 below. Construction activities would cause short-term elevated noise levels at the residential land uses to the east and west; and at the church to the north of the proposed project site. As described above and shown in Table 3-14, existing noise levels at short-term measurement locations ranged from 50 to 56 CIBA L,q at sensitive receivers on and around the project site. Noise generated during construction would be dependent on the types of construction equipment used during construction activity, site geometry (i.e., shielding from intervening terrain or other structures), and the distance between the noise source and receiver. Noise from construction equipment would be audible at sensitive receivers surrounding the project site, the closest of which are immediately north, east, and south of the project site and to the west across Sullivan Street. The Bat Nha Buddhist Meditation Center 3 70 June 2013 Initial Study/Mitigated Negative Declaration ICF 0021512 31 C-124