## 3 The Production of a Noise Study for the Evaluation of Construction Site Noise
### A Case Study--Assessment of Noise from the Construction of an Office Building
#### 3.2.2 Legislation, Maximum Permissible Noise Values from Construction Sites  
The protection of human health against noise and vibration is covered in Act No. 258/2000 Coll. on the protection of public health, specifically in SSS 30-34 of this act [6]. Government regulation No. 272/2011 Coll. In accordance with these acts, Government Regulation No. 272/2011 on the protection of human health against the adverse effects of noise and vibration was issued on 24 th August 2011 [7]. This regulation incorporates and enacts relevant European Union regulations and sets hygiene limits for noise and vibration in the workplace, along with methods for their determination and evaluation. It sets, inter alia, the hygiene noise limits for protected outdoor and indoor areas of buildings and stipulates the manner in which noise and vibrations are to be measured and evaluated for daytime and night-time periods. In part three, SS12 of this regulation, determining noise indicators are defined for the protected outdoor areas for which noise from adjacent construction sites is evaluated. Of all the paragraphs in SS12, paragraphs 1, 3 and 9 (quoted below) deal with construction noise, while the other paragraphs covering high-energy impulse noise, air traffic noise and old traffic noise load do not apply in this case. Night work is also not considered in this case. The determining indicator of noise, with the exception of high-energy impulse noise, is the equivalent sound pressure level A LAeq,T and corresponding levels in the frequency bands. During the daytime it is determined for the 8 continuous and consecutive nosiest hours (LAeq, 8 h), while at night it is for the noisiest 1 h (LAeq, 1 h). The hygiene limit for the equivalent level of sound pressure A, with the exception of air traffic noise and high-energy impulse noise, is determined as the sum of the basic sound pressure level A LAeq,T 50 dB and corrections taking into account the type of protected area as well as whether it is day or night-time, which are shown in Table 1, part A of Anne No. 3 to that regulation. For high impulse noise, an additional correction of \(-\)12 dB is added. In the case of noise with tonal components, with the exception of traffic noise on roads and railways and from air traffic, another correction of \(-5\) dB is added. The hygiene limit of the equivalent level of sound pressure A for noise from construction activities LAeq,s shall be determined by adding another correction to the hygiene limit for the equivalent sound pressure level A LAeq,T according to part B of Annex 3 to that regulation [7]. In part B of the Annex to that regulation, corrections for construction noise are stipulated: They are listed below in Table 1.  
Residential buildings are buildings which are used, even if only partly, for housing. The term \"protected outdoor area of a building\" means an area extending up to 2 m from a residential building, while a \"protected outdoor area\" is, according to Act No. 258/2000 Coll. as amended [6] an area which is used for recreation, sports, leisure or other activities. According to the Government Decree, Part Three, Section 12, Articl 9 [7]. The basic sound pressure level for construction site noise LAeq,T is 50 dB. Taking into account the corrections made according to the Annex to that regulation, noise limit values are calculated according to the type of noise. A method of calculating the hygiene limit for noise from construction activity LAeq,s for a period shorter than 14 h:  
LAeq,s = LAeq,T 50 dB + correction 7-21 15 dB = 65 dB. The hygiene limit for noise from construction activity for the daytime period from 7:00 till 21:00 is LAeq,s = 65 dB. Construction activities outside this period are not being considered for the studied construction project.