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POTENTIALLY ISSUES POTENTIALLY SIGNIFICANT LESS THAN NO SIGNIFICANT UNLESS SIGNIFICANT MPACT SOURCES ISSUES MMGATION IMPACT INCORPORATED For a project within the vicinity of a private airstrip, would the project expose people X 2,13 residing or working in the project area to excessive noise levels? EXPLANATION: On behalf of the applicant, a noise report was prepared by Paoletti Associates, Inc., which is included as an attachment. That report notes that the site is subject to the following noise sources: trains from the adjacent Union Pacific Railroad tracks; BART trains from the nearby elevated tracks; a stone quarry located to the east of the train tracks; and manufacturing from a nearby machine shop. The ambient noise level measured on -site was 56.8 decibels, which is within the levels described in the City's General Plan as conditionally acceptable for residential development. Conditionally Acceptable indicates that with normal construction practices, and with fixed windows and forced air systems, future residents would not be subject to an adverse noise environment. This measurement includes all noise events occurring during the 24-hour period of measurement. Short-term, single noise events, however, exceeded this level for short durations. Measurements for these short-term events ranged from 60 decibels for a passing BART train, to 90.5 decibels for a slow moving freight train with two diesel train engines. Due to the acceptable ambient noise level, no mitigation is required under Title 24 requirements. However, single event noise sources are much higher and will require implementation of the following mitigation measure in order to reduce potential impacts to a level of insignificance: • Prior to approval of the Final Map, a plan showing the exact location and proposed construction of the sound wall shall be submitted for review and approval by the Development Services Director and Building Official. Prior to issuance of the first Occupancy Permit, the sound wall shall be constructed along the eastern project boundary. The wall shall be made of massive material (e. g., masonry) of at least 54bs./sq. ft. density and be high enough (approximately 12-15 feet in height) to block the line -of -sight of the noise'source. In order to mitigate noise generated by freight trains, the sound wall shall be at least 12 feet in height above the height of the top of the railroad tracks. The wall shall be constructed to the satisfaction of the Development Services Director and the Building Official. 10._'TRANSPORTATION/CIRCLLATIO\. Would the ro'ect. Cause an increase in traffic which is substantial in relation to the existing traffic load and X 2,6 capacity of the street system (i.e., result in a substantial increase in either the number of vehicle trips, the volume to capacity ratio on roads, or congestion at intersections)? b. Exceed, either individually or cumulatively, a level of service standard established by the X 2,6 county congestion management agency for designated roads or highways? C. Result in a change in air traffic patterns, Including either an increase in traffic levels or X 2,13 a change in location that results in substantial safety risks? d. Substantially increase hazards due to a design feature (e.g., sharp curves or dangerous X 2,6 intersections) or incompatible uses (e.g., farm equipment)? e. Result in inadequate emergency access? X 2,6 f. Result in inadequate parking capacity? X I 2, 6 g. Conflict with adopted policies, plans, or Programs supporting alternative transportation X 2,6 (e.g., bus turnouts, bicycle racks)? h. Trigger CMA Review? (GPA involving more than 100 p.m. peak hour trips generated over X 2 existing general plan land use) Preda Street Homes - Initial Study Checklist 11 Janu uy 2001