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Ponderosa Homes at 6900 Valley Trails Drive Initial Study and Negative Declaration site at Petrified Forest Ct. and approximately 54 feet from 1-680 sound wall, reported noise levels of 65-67 decibels on the day-night equivalent level (dB Ldn).15 DISCUSSION a,c,d)For single-family housing projects, the City's General Plan generally requires that backyard areas not exceed 60 dB Ldn and that indoor noise levels not exceed 45 dB Ldn. As described in the setting section, exterior noise levels at the project site may approach 60 dB Ldn under existing conditions, especially along the western side of the project site, closest to 1-680, but would not be expected to exceed the General Plan standard. The development of the project would generate added noise, such as vehicle travel and landscape maintenance activities. However, noise levels are not expected to change substantially from those currently experienced in the area because overall activity levels at the site would be modest. Ambient noise levels could decrease for some of the adjacent properties, particularly further east of 1-680, due to the shielding of traffic noise by the proposed structures. Estimated future noise levels at the clubhouse are likewise expected to be within normally acceptable standards and would be subject to regulations in the PMC Noise Ordinance with respect to indoor and outdoor events. As required by the California Building Code (CBC), rooms where windows need to be closed to reach interior noise goals would need to include ventilation or air-conditioning units. Short-term construction noise would be generated at the project site. Conditions of approval for the project allow construction hours from 8:00 a.m. to 5:00 p.m., Monday through Friday, with no work Saturdays, Sundays or holidays. The Director of Community Development may approve earlier construction "start times" or later "stop times" only for specific construction activities (e.g., concrete pouring) if it can be demonstrated that the expanded construction hours are necessary (e.g., the concrete foundations need to be poured early due to weather conditions). Construction equipment would be required to meet Department of Motor Vehicles (DMV) noise standards and be equipped with muffling devices, according to standard conditions of approval. As a result, this potential impact during operation of the project and during construction would be less than significant. 15 City of Pleasanton. Pleasanton General Plan 2005-2025, Noise Element. Adopted July 21, 2009, Amended January 6, 2015: 11-6. 35