Chapter-III(59-80) - Pollution Control Board, Assam

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EIA & RA STUDY FOR NAPHTHA SPLITTER PROJECT AT NUMALIGARH REFINERY LIMITEDBaseline Environmental Status3.9.6 Results & Discussion3.9.6.1 Ambient Noise Level within Refinery CampusThe ambient noise level recorded at the main plants has been presented in Table- 3.48.The 24 hour leq values of noise level in main Units was recorded in the range of 59.5dB(A) to 61.5 dB(A). The noise level recorded during day time was in the range of 54.1 to70.0 dB(A) and the same was found in the range of 46.8 to 60.5 dB(A) during night time.It is concluded that the observed noise level values of the plants located within NRLcomplex are in compliance with and well below the noise level standards for industrialareas.3.9.6.2 Ambient Noise Level outside RefineryThe ambient noise level of the areas located outside NRL complex has been presentedthrough Tables - 3.49. The 24 hour leq values of ambient noise in the nearby villagesaround NRL have been found in the range of 41.5 to 48.4 dB(A). Noise levels in all thevillages located around NRL complex were recorded in the range of 39.5 to 54.5 dB(A)during day hours whereas the same were reported to be 38.4 to 47.9 dB(A) in night hours.It is concluded that the observed noise level values of the areas located outside therefinery complex are in compliance with and well below the noise level standards forresidential and rural areas.3.9.7 Ambient Noise Level StandardsThe Government of India, in exercise of its power under section 16(2)(h) of the Air(Prevention and Control of Pollution) Act 1981, notified the ambient air quality standardswith respect to noise (which has been included as an air pollutant under section 20 of theAmended Air Act of 1987) is presented in Table- 3.47.Table - 3.47National Ambient Air Quality Standard for NoiseAreaCategory of AreaLimits in Decibels, dB(A)Day TimeNight TimeA Industrial Area 75 70B Commercial Area 65 55C Residential Area 55 45D Silence Zone 50 40NOTE:1. Day Time is reckoned between 6 AM and 10 PM.2. Night Time is reckoned between 10 PM and 6 AM.Projects & Development India Limited, Sindri Page 72 of 80
EIA & RA STUDY FOR NAPHTHA SPLITTER PROJECT AT NUMALIGARH REFINERY LIMITEDBaseline Environmental Status3. Silence Zone is defined as area up to 100 metres around such premises as hospitals,educational institutions and courts. The silence zones are to be declared by thecompetent authority. Use of vehicular horns, loudspeakers and bursting of crackersshall be banned in these zones.4. Mixed categories of areas may be declared as one of the four above mentionedcategories by the competent authority.‣ dB(A) Leq denotes the time weighted average of the level of sound in decibels onscale "A" which is related to human hearing.“A”, in dB(A), denotes the frequency weighing in the measurement of noise andcorresponds to frequency response characteristics of the human ear.Projects & Development India Limited, Sindri Page 73 of 80
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Chapter-III(59-80) - Pollution Control Board, Assam

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