75D - PH ZONING ORD AND CUP CALIFORNIA PALMS

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NR-1-This reading was obtained on-site inside the rear portion of the pool area of the South Building. The 15- minute reading began at 11:00 am. Backgound noise include the rooms' air conditioning units, traffic noise, bird calls, and aircraft overflights. NR-2 -This reading was obtained on-site inside the front portion of the pool area of the Middle Building. The 15- minute reading began at 11:19 a.m. Background noise include. the rooms' av conditioning units, traffic noise, and aircraft overflights. NR-3 -This reading was obtained in the grassy azea located in front of the NorW Building along Harbor Boulevard. The meter was placed 50 feet east of the centerline of travel (grease stain) of the near, northbound lane. The 15-minute reading began at 11:41 a.m. Background noise was due to traffic on Harbor Boulevazd, but aircraft overflights, including a heliwpter overflight, also added to the ambient noise level.. Northbound traffic on Hazbor Boulevard included 295 autos, 11 medium trucks, and three heavy tracks, Southbound traffic included 276 autos, I 1 medium tracks, and one heavy truck. Two cars were also observed to pass the meter. at a distance of about 20 feet; one pulling into and pulling out of the motel. NR-4 -This reading was obtained on-site in the grassy courtyard area of the north building. Harbor Boulevard was partially visible from this location. The 15-minute reading began at 12:06 p.m. Background noise include-the rooms' air conditioning units, traffic noise, and people passing through the courtyard. NR-5 - To determine compliance with the State itrterior noise standards for sensitive land uses, this reading was obtained inside of Room 462. This second floor room faces directly o»to Harbor Boulevard with a window view of the street. The room is also located along the facility driveway and subject to parking lot noise. Furthermore, the room is located next to the stairway and people using the other rooms along this floor continually pass this room. As such, the room represems a reasonable worst-case scenario. Interior courtyard rooms, those that face the Park~B area, and those along the West I{em Avenue that do not face onto harbor Boulevard would be considerably quieter than the monitored room. As noted, the reading included 24 hourly readings as well as a 24-hour composite reading, The composite reading is included in Table 3. The results of the 24 hourly measurements, and calculated interior CNF.L, aze included In Table 4. Note that the results of the analysis show an i~erior noise level of 50.7 dBA CNEL. As noted, the State sets urterior noise standard of 45 dBA CNEL. 2.4.2 Noise Level Modeling Modeling of Observed Field Data Noise from motor vehicles is generated by engine vibrations, the imeraction between tires and the road, and the exhaust system. Reducing the average motor vehicle speed reduces the noise exposure at receptors adjacent to the road. Each reduction of 5 mph reduces noise by approximately 1 dBA. The Caltrans 5ound32 version of the Federal Highway Administration traffic noise predicfion model (Sound32 - Release 07/30/91) was used to evaluate traffic-related noise conditions in the project area. The model predicts i- hour Leq noise levels and these are conrpazed with the field measurements to determine the applicability of the model to local conditions, Later in this analysis, a factor is applied to provide the CNEL noise levels. These latter values were used in assessing potemial impacts from the project implemerrtation. The Sound32 noise model uses various parameters including the traffic volume, vehicle mix, vehicle speed, and roadway geometry to compute typical equivale~ noise levels. Sound32 modeling was prepared for the number of vehicles and logistics observed during field reading NR-3 obtained along Harbor Boulevard. Vehicles were modeled at the posted speed of 40 mph. Bath "soft" and "hard" site modeling were prepared. The resuhs of this analysis aze included in Table 5. Note that the best overall correlation is obtained for "soft" site modeling where Predicted values are within 1 dBA of the measured values. 75D-129