11 ATTACHMENT 04 - Laserfiche WebLink

C. Ground-Borne Vibration • The railr<,ad induced ground-borne vibration levels at the most impacied darned building setback. 60 ft. from the centerline of the railroad It nels (ground lev el) ranged from 73 VdB for ar ACE train and 79 Vd13 for a freight train. Using the adjustment methodoli_Lges of the FTA. the ibration levels in the firs: floor Irvine spaces of the project will be up to 83 VdB. At the second floor elevations_ the vibration levels v>iII be up to 82 VdB. Thus. the yib*ation levels within the dwelling units will exceed the 80 VdB critenon established by the Is—A for infrequent rail operations Mitigation meas tros for ground-borne yihra:ion will be required. The recommended measures arc described in Section 11. below. 11. Recommendations A. Exterior Noise To achieve compliance iv,ith the 60 dB DNL standard of the City of Pleasanton Noise Element for the calerior living areas impacted b,' Stanley Boulevard traffic, the following noise control birder kill be required: • Construct a 6 ft. high acoustically-effective barrier alone the property lines of Lots and 14 contiguous with Stanley Boulevard. Continue the barriers along the westerly property line of Lot I and along the easterly property line of Lot 14. The barriers may terminate at the propene boundaries with Lots 2 and 13. respectii.el,.. Turn the barriers to connect air-ti<ght to the sides of the houses. The barrier height is in reference to the nearest building pad elevation.