WEEK 1
Noise Monitoring
Date: 23/11/2016
Time: 16:21:39
MEASUREMENT
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DATE: 23rd NOVEMBER 2016
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TIME:
4.30 PM
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MEASUREMENT
TIME INTERVAL: 1 HOUR
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EQUIPMENT
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SOUND
LEVEL METER
MODEL:
EXTECH INSTRUMENT
SERIAL
NO: 150105006
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WEATHER CONDITION
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WEATHER
EQUIPMENT SERIAL NO: SM 15413297
PRESSURE
(Pa): 1016 hPa
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PRECIPITATION:
RAINING/DRIZZLE
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CLOUD
COVER: CLEAR/SCATTERED CLOUD/PARTLY CLOUD/MOSTLY CLOUD/OVERCAST
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AVERAGE
WIND SPEED: 4 kph
TEMPERATURE:
36˚C
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HUMIDITY
(%): 46%
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DESCRIPTION AND OPERATING CONDITION OF THE SOUND
SOURCE
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LOCATION
OF SITE: ALOR GAJAH ROUNDABOUT
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DESCRIPTION
OF SITE: THE ROUNDABOUT IS LOCATED BESIDES MAIN ROAD AND ALSO LOCATED OPPOSITES
TO SHOP LOTS AND ALSO INDUSTRY AREA.
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BUILDING
GEOMETRY: SINGLE STOREY
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GROUND
COVER & CONDITION: TAR ROAD
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PARAMETERS
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HEIGHT
OF MICROPHONE (Hr): 1.2 m
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HEIGHT
OF SOURCE (Hs): 1.5 m
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DISTANCE
BETWEEN SOURCE AND MICROPHONE (r): 3.54 m
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ROAD TRAFFIC
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# OF
HEAVY VEHICLES (>3500KG)
(Min
30): 69
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# OF
LIGHT VEHICLES
(Min
30): 1440
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AVERAGE
SPEED: 60 km/h
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As the journey begins, we have
arrived at Roundabout Alor Gajah Centre to do an assessment of noise
monitoring. The crew members were setting up the instrument on place
accordingly. We started at 16:00:41 and we managed to finish it up at 17:00:41.
Here are the results that we obtained after 1 hour finished
up the noise monitoring assessment:
Overview
Above are the value of noise
level that are taken during 1 hour period of time:
Firstly, L10 is the noise level
exceeded for 10% of the time of the measurement duration. This is often used to
give an indication of the upper limit of fluctuating noise, such as that from
road traffic. So for the 1st week, the value of L10 is 72.9 dB. Then
for L50, it is the noise level exceeded for 50% of the measurement duration. Therefore
the value of L50 is 66.9 dB. Next, the L90 is the noise level that is taken to
be the ambient or background noise in the road traffic. The value of L90 is
62.6 dB. Futhermore, the value of Max dB for this particular week 95.4 dB. This
is due to heavy vehicles were passing by on the road traffic. In addition, Leq
is the Sound Pressure Level in dB, time-averaged level and is equivalent to the
total Sound Energy over a 1 hour period of time on the road traffic. The value
of Leq is 70 dB.
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