Noise Monitoring and Assessment Results

[WEEK 2]
11th December 2016  - 7.30 am
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ENVIRONMENTAL NOISE

(ISO 1996-1 & ISO 1996-2)

MEASUREMENT
DATE: 11 NOVEMBER 2016		TIME: 7.30 AM
MEASUREMENT TIME INTERVAL: 1 HOUR
EQUIPMENT
SOUND LEVEL METER MODEL: EXTECH INSTRUMENT SERIAL NO: 150105006
WEATHER CONDITION
WEATHER EQUIPMENT SERIAL NO: SM 15413297 PRESSURE (Pa): 1013 hPa		PRECIPITATION: RAINING/DRIZZLE
CLOUD COVER: CLEAR/SCATTERED CLOUD/PARTLY CLOUD/MOSTLY CLOUD/OVERCAST
AVERAGE WIND SPEED: 0 kph TEMPERATURE: 24˚C		HUMIDITY (%): 74%
DESCRIPTION AND OPERATING CONDITION OF THE SOUND SOURCE
LOCATION OF SITE: MORNING MARKET
DESCRIPTION OF SITE: THE MARKET IS LOCATED BESIDES MAIN ROAD AND ALSO LOCATED OPPOSITES TO SHOP LOTS AND ALSO HOUSING AREA.
BUILDING GEOMETRY: OPEN AREA
GROUND COVER & CONDITION: TAR ROAD
PARAMETERS
HEIGHT OF MICROPHONE (Hr): 1.1 m		HEIGHT OF SOURCE (Hs): 1.5 m
DISTANCE BETWEEN SOURCE AND MICROPHONE (r): 5.3 m
ROAD TRAFFIC
# OF HEAVY VEHICLES (>3500KG) (Min 30): 30	# OF LIGHT VEHICLES (Min 30): 350		AVERAGE SPEED: 60 km/h

We had collected the result of our noise monitoring for this week. The results shows the noise level at each second for an hour [60sec x 60min]. So, we had a total of 3600 data. To simplify the data obtained, we had calibrated a line graph to observe the pattern.

The highest level recorded by the equipment is data on 1659 seconds which is at 7:58:32 AM where the level reaches up to 87.3 dB. From our observation, the increase on the level of noise at that particular time is due to a disturbance that occur.

L10

L10 is the noise level exceeded for 10 percent of the time of the measurement period. For week 2, the noise limit of L10 was 67.7 dBA means that over a period of one hour. The noise from morning market activities can only exceed 67.7 dBA for a total of six minutes.

Leq

Leq is the time-averaged level and is equivalent to the average energy over the whole measurement period. Leq, or LAeq as it is know called, has become the preferred international descriptor for environmental sound and will be incorporated into all new standards. For week 2, the Leq is still 70dB.

L95

L95 is the level exceeded for 95 percent of the time and represents the background level without any morning market noise present. The morning market background noise level in week 2 [58.2] is slightly higher from week 1.

Max dB

Max dB is the maximum level measured over a period of one hour, but it is not the same as, or not as high as, an individual peak level. In week 2, the max dB is 92.5 dB.

Difference between L10 and Leq

In week 2, the L10 is around 3 to 2 decibels lower than the Leq.

SEL

Sound Exposure Level (SEL) is numerically equivalent to the total Sound Energy.
SEL = Leq + 10 log10 T
SEL = 70 + 10 log 10 3600
SEL = 105.5 dB

In a conclusion, our first monitoring activity has indeed succeeded and we are looking forward to finish the rest 3 weeks.