Measurement volume EPNL (Effective Perceived Noise Level) from the aircraft of the project. In operation between 22 - 28 March 2557 in a given area, according to the Environmental Impact Assessment of 6 stations, including drug LDS Temple Wat graduate school Rajprachanukroh 4, Pakphun home. A good project area And 2 additional measurement stations, including Wat Muang. And the mouth of Old Table 4.2-4 shows the results of measuring the volume EPNL measured by dividing the volume by the volume of commercial aircraft and helicopters was found that the volume of commercial aircraft EPNL a maximum value at the monitoring stations. The project area is 101.5 decibels, followed by the School Net Mattayaram is 91.6 dB, the noise level EPNL from the helicopter was found at stations in the project area as well as the value 105.9 decibels lower. Beauty is a home to a 931-decibel
sound level measurement results are shown in Table 4.2-4 EPNL detailed measurement results are shown in Appendix 3-2.
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