proposed integrated complex for delhi judicial academy

23.04.2015 Views
Rapid Environmental Impact Assessment (REIA) Study for Proposed Integrated Complex for Delhi Judicial Academy, National Law School, and National Institute for Mediation & Conciliation at Dwarka, New Delhi 102

Rapid Environmental Impact Assessment (REIA) Study for Proposed Integrated Complex for Delhi Judicial Academy, National Law School, and National Institute for Mediation & Conciliation at Dwarka, New Delhi Figure 5.1: Noise level due to operation of various construction equipments It is a known fact that there is a reduction in noise level as the sound wave passes through a barrier. The transmission loss values for common construction materials are given in Table 5.2. Table 5.2 Transmission loss for common construction materials MATERIAL THICKNESS OF CONSTRUCTION DECREASE IN NOISE LEVEL DB(A) MATERIAL (INCHES) Light concrete 4 38 6 39 Dense concrete 4 40 Concrete block 4 32 6 36 Brick 4 33 Granite 4 40 Thus, the walls of the adjoining buildings along with other factors like air absorption, vegetal cover etc. would result in significant attenuation of atleast 20 - 25 dB(A) at 100 m distance. The resultant noise levels on proposed project site at 50m distance at peak level of construction are anticipated to be about 55 – 60 dB(A), which is well within the limit for commercial area during the day time. Further to minimize these potential impacts, major construction activities would be scheduled during normal daylight working hours and would be implemented consistent with the applicable standards. The construction contractor will use equipments that are adapted to operate with appropriate noise muffling devices resulting in the least possible noise. Every effort would be taken 103

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