DISCUSSION NOISE

    DISCUSSION 

     The objective of the experiment is to monitor the how much sound generated from source and to identify, to record the parameter of noise monitoring at specific place, time and duration of monitoring and justify how the noise will effect the workers and the people stopping at the tol. This experiment was done using Sound Level Meter(SLM). SLM contains a microphone, an amplifier, frequency response networks and a type of indicating meter. SLM indicates the sound level pressure in decibels (dB) by measuring the sound pressure level, then amplifying and scaling it. Noise survey included a visit to a site and the noise measurement of  the noise source was determine. in this monitoring, TOL SIMPANG AMPAT was the place that we had selected to measure the noise level. The distance of microphone from the source was 6.8 meter, the height of the microphone from ground was 1.0 m, the height of source was 1.8 m and the duration of monitoring was 1 hour per week for 5 weeks. We had chose Wednesday as the day of monitoring and time of monitoring was between 5-6 p.m. because it was a weekday and the time of people getting back from working. 

    Fom 5 weeks of monitoring the noise at the place, the average parameters was obtain to be presented. First, the data L10 shows the noise level exceeded for 10% of the time of the measurement duration. This usually is to indicate the peak noise during that time period. For the average of 5 weeks, the L10 obtained was 74.68 dB. This was maybe because of the slightly heavier traffic during the evening. Next, L50 is used to indicate the level exceeded 50% of the time, which statistically indicate noises at the mid-point of the noise reading (slightly above average for the area), which was recorded an average of 68.18. After that, L90 is noise level that exceeded for 90% of the time, which generally represent the ambient or background noise of that area. The average result for L90 was 61..16 maybe because of the workers and people passing by near the sound level meter at the area during the period. After that, the average value of Max dB for this week was 100.22 dB. The value of average Max dB quite high because of the lots number of heavy oil tankers or trailers passing by during that time period. Lastly, is the Leq which is actually the Sound Pressure Level in dB which was also known as average energy emitted throughout the time period at the location, which for us is at the toll station. So for the Leq the average value of 5 weeks monitoring was 74.28 dB.  By observing at the result, it shows that the average was below 85 dB. Therefore, the noise produce is below than the Permissible Noise Exposure Time by Occupational Safety and Health (OSHA) which stated the limit time exposure for 85 dB was for 8 hours of exposure to noise. This show that the workers and visitors are safe to works and to stop at the Tol. 

     As the conclusion, we have achieved the objective of monitoring the noise pollution at the TOL SIMPANG AMPAT. We had identified the source generated, record the parameters and justified the safe  Permissible Noise Exposure Time for the workers and visitors.