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STATEMENT OF FACTS: The closest of the residences to be developed under Phase 2B would be more than seven hundred feet from the Southern Pacific Railroad tracks and would be exposed to railroad noise of about 51 dBA, Ldn, which is less than the City standard of 55 dBA, Ldn. No significant impact from railroad noise would result from implementation of this phase of the project. As discussed in the GDP EIR, railroad -induced ground vibration velocities would be below the human perception threshold at all on -site locations. Exterior noise controls in the form of a 14- foot air -tight sound wall would be constructed along the eastern property line of Phase 3 development contiguous with the Southern Pacific Railroad tracks. The noise barrier may be reduced to 13 feet at the northern portion of the Phase 3 development. While a noise barrier will also reflect railroad noise back toward development on the east side of the tracks, the limitations of acoustic reflection would result in an increase of about 1.5 dBA, which would be a less than significant noise impact to receptors on the east side of the tracks. Flanking noise barriers would continue along the north and south property lines for a distance of 240 feet from the centerline of the tracks. The flanking barrier height may be reduced by two -foot increments at distances of 75, 100 and 150 feet from the main barrier. Exterior noise controls in the form of a 10-foot air -tight sound wall (relative to railroad track elevation) would be constructed along the eastern property line of Phase 2A development contiguous with the Southern Pacific Railroad tracks. The southern end of the barrier would continue for 120 feet south of Lot 77 to connect with the barrier from Phase 1 development. A flanking noise barrier would continue along the property line contiguous with Lewelling Boulevard for a distance of 90 feet from the main barrier. An eight -foot flanking noise barrier would extend along the west side of Anchorage Drive from Lot 16, along Lewelling Boulevard, to the west of lot 14, where it would connect with the Lewelling Boulevard soundwall recommended in the GDP EIR. Flanking barrier heights may be reduced by two -foot increments at distances of 75, 100 and 150 feet from the main barrier. Potential purchasers would also be informed of nearby railroad operations prior to sale of new units. E.3 POTENTIAL IMPACT: Aircraft generated noise levels may exceed exterior and interior noise standards. FINDING: Changes or alterations have been required in, or incorporated into, the project that avoid or substantially lessen the potential significant environmental effect. STATEMENT OF FACTS: All mitigation identified in the GDP EIR would be implemented. While exterior aircraft noise would remain within the conditionally acceptable land use compatibility category (55 to 65 dBA, Ldn), implementation of recommended noise insulation features within the design would allow for development commensurate with conditions specified within the City of San Leandro General Plan. 11