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City of Santa Ana Environmental Checklist Worship and Parking Lot Activity Noise. Chanting during worship services and parking lot activity (conversations, vehicle engines, car alarms, and doors slamming) will contribute to onsite ambient noise levels. Two noise measurements (ST-4) were taken onsite to analyze onsite noise levels from worship services and parking lot activity. Measured noise levels ranged from 52 dBA Leq up to 56 dBA Leq. The measurements represent a pre-activity noise level (52 dBA Leq) and a measurement taken during the height of activity (56 dBA Leq). Noise levels of this magnitude would attenuate approximately 6 dB per doubling distance. Noise levels at the closest sensitive receiver would have ranged between 46 - 50 dBA Leq. Noise levels of this magnitude would likely be below the ambient noise levels at the closest sensitive receiver. The new parking facilities will be located in a newly designed underground facility and along the backside of the proposed site. Worship services would be confined to the courtyard. Based on construction plans, the center of the courtyard would be located approximately 100 feet away from the closets sensitive receiver (the New Spirit Baptist church). If the number or worshippers were to double during worship services, the resultant noise increase would be approximately 3 dB or a noise level of 59 dBA Leq. A noise level of 59 dBA would attenuate to approximately 53 dBA at the closest sensitive receiver. An existing wall which extends across all the north, east, and south side of the property would also provide shielding during worship service and from parking lot noise at the adjacent sensitive land uses. As a result, noise related to operation of the proposed project is less than significant. b. Exposure of persons to orgeneration of excessive groundborne vibration or•groundborne noise levels? Less-than-Significant Impact. The Federal Transit Administration (FTA) has compiled typical vibration levels generated by construction equipment, which are commonly used as a reference for construction vibration level analysis. The vibration levels produced by construction equipment are outlined in Table 3-17. Vibration levels from construction equipment attenuate as they radiate from the source. The equation to determine vibration levels at a specific distance states that PPVeq,ip = PPVref X (25/131)^ 1s where PPV,er is the Peak Particle Velocity at a reference distance of 25 feet, and D is the distance from the equipment to the sensitive receptor (USDOT 2006). GI'oundborne vibration typically decreases rapidly with distance. Based on the FTA data, vibration velocities from typical heavy construction equipment operation that would be used during project construction range from 0.076 to 0.089 inches per second peak particle velocity (PPV) at 25 feet from the source of activity. At 50 feet from the source activity (closest sensitive receiver Church to the north of the Project site), PPV ranges from 0.027 to 0.032 inch per second. Because neither the state nor the local municipalities maintain regulatory standards for vibration sources, potential structural damage and human annoyance associated with vibration from construction activities were evaluated against California Department of Transportation (Caltrans) vibration limits (Table 3-18). A vibration level of 0.10 inches per second PPV was used to evaluate impacts on nearby receivers because this level represents the boundary between barely perceptible and distinctly perceptible vibration as recognized by Caltrans and others. Because the predicted vibration levels from project construction would be well below applicable vibration thresholds, impacts from groundborne vibration or groundborne noise would be less than significant. The Bat Nha Buddhist Meditation Center 3 7A lune 2013 Initial Study/Mitigated Negative Declaration ICF 00215.12 31 C-128