SU0004401 - Laserfiche WebLink

Home Browse Search

The conclusions reached from the various data collected during event,non-event and daily farming activities indicate that during most sampling periods the background levels observed exceed the noise standard. Specifically,the CNEL standard of an equivalent hourly reading of 45dBA is not reliably met at most times during the 7:00 a.m. to 10:00 p.m. time period no matter what is taking place in the area. During event activities the CNEL hourly equivalent is exceeded at the property line by approximately 4.5 —9dBA with the exception of one reading 14dBA above the 45dBA level. It is clear that when the event activities are effectively attenuated, the resulting data can be lower than normal daily readings, such as during the June 3, 2000 event. It is also clear that, if attenuation is not properly addressed,than exceeding the standard above ambient is likely to occur. It is our opinion that if additional attention is placed on the attenuation of the sound pressure levels associated with the events and working in conjunction with the neighboring residences an acceptable level of noise may be obtained. It is difficult to ascertain how the ambient or background noise can be brought into the hourly 45 dBA or lower range to meet the CNEL standard specified in the San Joaquin Noise Element. 65dBA Maximum Level Results Reviewing the 1-minute histogram during the June 3, 2000 sampling, which was a scheduled event day, it is evident that the 65dBA maximum level was met or exceeded 1.1 % of the time between 4:30 a.m. and 10:38 p.m. Upon analysis of this data it is evident that of the 1,080 total minutes recorded the following breakdown of the readings occurred. The data indicates that four of the readings were attributed to the set-up and take down of the equipment, 12 of the readings were related to farming activities from the tractor and other sources, three of the readings are likely related to traffic noise, and three of readings occurred during the function. The three readings recorded during the function that are above the 65dBA level were isolated readings representing only 0.20% of the time recorded. This result is not considered statistically significant when compared to the data of the next sampled non-event day. Upon review of the data from June 15, 2000 (a non-event day) the 65dBA maximum level was exceeded 2.1% of the sampled time. The 1,500 total minutes analyzed resulted in the following analysis. Four readings were related to the set-up and take down of the equipment, 15 readings were related to farming activities and three readings were related to traffic noise. The 15 farm related readings and the three traffic readings occurred during various times of the day time period recorded. A review of the sampling data from the July 1, 2000 event indicated that the 65dBA maximum level was exceeded three times and that all three readings were related to the set-up and take down of the equipment. No other 65dBA or greater maximum levels were recorded. 4