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HomeMy WebLinkAboutCT 93-09; Ocean Bluff; Tentative Map (CT) (99)^ '' JAMES C. BERRY - ACOUSTICIAN 24O1 Trace Road Spring Valley, CA91978 (619)660-0064 May 26 1994 Reference: 9321.94A Jack Henthorn and Associates 5431 Avenida Encinas, Suite G Carlsbad, CA 92OO8 (Attention: Mr. Jack Henthorn] Dear Mr. Henthorn: Reference: Ocean Bluff, Noise Barrier Wall I reviewed the four exhibits received May 26 1994, and have run calculations of the noise attenuation provided by each of the four alternatives. The following assumptions were made: 1. The noise wall is 6 feet high. 2. The observer is standing 55 feet from the edge of the right-of- way, that is, 1O6 feet from the centerline of Poinsettia Lane. In the case of alternative No.4, an extra case is considered with the observer standing at the wall of the dwelling. 3. The observer 's ears are 5 feet above the ground. 4. Pad grade is 5 feet below street grade. 5. Poinsettia Lane will be carrying 24.8OO Average Daily Trips (ADT) at 55 mph with 97 percent autos. 2 percent medium trucks and 1 percent heavy vehicles [Source: Hunsaker and Associates.]