11 ATTACHMENT 04 - Laserfiche WebLink

- 6 - To achieve compliance with the 70 dB DNL standard of the City of Pleasanton Noise Element for the exterior living areas impacted by railroad operations. the Ibflowing noise control barrier will he required • Construct an 8 ft. high acoustically-effective barrier along the property lines of Lots 5. 6. 7. 8 and 9. The harrier heights is in reference to the nearest building pad elevation. • Please see Figure 1 for the locations and heights of the recommended noise control barriers. To achieve an acoustically-effective barrier, it must be made air-tight. i.e., without cracks. gaps. or other openings and must provide for long-term durability. The barriers can be constructed of wood. concrete. stucco, masonry. metal. earth berm or a combination thereof and must have a minimum surface weight of 2.5 lbs. per sq. ft. If wood fencing is used, homogeneous sheet materials are preferable to conventional wood fencing as the latter has a tendency to warp and form openings with age. However. high quality. air-tight. tongue-and-groove. shiplap. or board and batten construction can be used, provided the minimum surface weight requirement is met and the construction is air-tight. Gates may be incorporated into the barrier return segments at the sides of Lots 1 and 14. The gates must he of the same height as the main barrier, must meet the minimum surface weight requirement and must ft tight to the main barrier when closed. The gaps at the hinge and closure jambs shall be covered with astragals/stops. The gap below the gate shall be no more than I" high. The noise control barriers must be constructed so that all joints. including connections with posts. pilasters or the building shell are sealed air-tight and no openings are permitted between the upper barrier components and the ground. The implementation of the above recommended measures will reduce exterior noise exposures to 69 dB DNL or lower in the noise impacted exterior areas along Stanley Boulevard and to 70 dB DNL or lower in the exterior areas impacted by railroad noise.