PEARU TERTS G and J M Barwick Pty...• iPhone3 with AudioTools App • Weather Instruments (Aneroid...

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PEARU TERTS BA, Grad. Dip. Env. Stud. (Hons.), MIE Aust., CPENG, MAAS Consulting Engineer

33 Falcon Rd Claremont 7011 Tasmania AUSTRALIA

Mr T. Barwick Barwick’s Landscape Supplies Turners Road Granton Tasmania 7050 Tel. 03 6263 2145 23/3/2016 Tana Tyre Shredder, Noise Issues Dear Sir, Attached are the results of our noise measurements and analysis. Appendix A deals with the acoustic climate in the neighbourhood of the nearest houses at the proposed site and measured noise levels from the shredder operating at the Mornington location. The main results are shown on page A 7. Calculations were then performed, using the results of the noise levels of the tyre shredder at 28 metres to determine noise levels at the neighbours assuming geometric spreading rate 6 dB/doubling of distance and an excess attenuation of 3 dB per km. The results were then compared to the statistical noise levels (page A 7) measured at the nearest neighbours. In the last column of the table on page A 7, Ln is the noise level exceeded for n % of the sampling time. For example, in the last column, L90 = 49.8 dB(A). This means that for 90 % of the sampling time of 10 minutes, that is 9 minutes, the noise level was 49.8 dB(A) or more. L90 is a good descriptor of the background or base noise level. Again, in the same column, for L10, that is for10 % of the time, or, 1 minute, the noise level was 54.6 dB(A) or more. That is, L10 = 54.6 dB(A). L10 is a good descriptor of the average of the higher noise levels encountered. L10 is often used in traffic noise studies. L10 averaged over 18 hours from 0600 h to 2400 h is designated L10 (18 h). A criteria used for traffic noise is that L (18 h ) should not exceed 63 dB(A) at sensitive areas. Leq is the equivalent noise level. A fluctuating noise having an Leq = 54 dB(A) has the same acoustic energy as a steady noise of 54 dB(A).

ARCHITECTURAL ACOUSTICS NOISE CONTROL

Phone 03 6249 7165 Fax 03 6249 1296 Email [email protected]

mailto:[email protected]

2 The measurements at 28 m indicate that during shredding of tyres, the L10 = 81.3 dB(A), L90 = 78.7 dB(A) and Leq = 80.1 dB(A). At location 2 (1 Crooked Billet Dr.324 m) and location 3 (4 Welly Park Rd.,) the nearest houses to the proposed location at Brighton, we measured the following noise levels as shown in the table below, which also includes the likely noise levels calculated from the shredder noise levels measured at 28 m. dB(A) 1 Crooked Billet Dr 4 Welly Park Rd L10 56.4 54.6 L90 47.7 49.8 Leq 53.9 54.0 Calculated shredder Leq 57.7 59.6 Difference in Leq’s 3.8 5.6 Page A 9 shows the noise level at 14 m from each side of the machine with the engine radiator end being 0 degrees and the conveyor output end being 180 degrees. There are a few dB’s to be gained by orientation of the machine. The exhaust noise can be reduced by the addition of a secondary muffler or replacing the muffler with a residential quality muffler system. There is room to do that. The other alternative is to erect a noise barrier around the engine end of the machine. The exhaust is at a height of about 3 m. The roof is at 3.2 m. Calculations indicate a noise barrier made of material having a surface density of about 20 kg/m^2 and located 3 m from the machine, is likely to reduce the noise as follows: dB Barrier Ht (m) 1 Crooked Billet Dr 4 Welly Park Rd 2.1 0.6 1.0 2.4 1.2 1.8 2.7 2.2 3.5 3.0 4.3 5.0 3.6 7.8 8.8 4.0 9.7 10.6 Containers have a height of about 2.6 metres. I would recommend that use is made of the containers to provide a noise barrier effect. I would also recommend that you investigate the installation of a secondary muffler. There is space in the engine compartment to replace the vertical exhaust with a 900 mm long muffler. It is worth noting that people can usually tolerate increases in noise level of between 3 dB(A) and 5 dB(A). An increase in noise level of +3 dB is judged to be a “just noticeable difference”. This means that out of 100 members of the public, when presented with a noise which is then increased

3 by + 3 dB, 50 will say there is no increase and 50 will say there is an increase. It represents appoint of indifference where it is difficult to judge whether the noise level has increased or not. Page A 12 shows the spectral content of the noise of the shredder. There is a feature at 250 Hz but subjectively no tone was heard. The two nearest houses are in a noisy climate. The Crooked Billet Dr. house enjoys a wide visual and aural panorama whereas the Welly Park house is closer to the roads. Seeing that the shredder is to be used 2 days every two weeks, my opinion is that noise complaints are unlikely. Having said the above, I would install a secondary muffler as soon as possible. Yours sincerely, Pearu Terts.

A1

Pearu Terts – Field Report – Barwicks Tyre Shredder, Brighton – Mar 2016

Brighton Industrial Estate, Barwicks Tyre Shredder project

Field report for site visits March 2016 Appendix A to be read in conjunction with main report

General

It is proposed to shred waste tyres at Brighton Industrial Estate adjacent to the weighbridge. To the northwest

lies a residence at 1 Crooked Billet Drive, and to the southeast lies residence at 4 Weily Park Rd, as the nearest

sensitive receivers. This report describes the findings of shredder test noise monitoring at Mornington waste

transfer complex and measurements from Brighton receiver sites from the respective site visits 13:00-14:45 and

15:30-16:30, 16/3/2016.

Instruments used

• Brűel & Kjær Sound Level Calibrator Type 4230 s/n 1169836, Laboratory Certified February 2014;

• Norsonic Precision Sound Level Meter Nor131, s/n 1312829, Laboratory Certified December 2014;

• Rion Precision Integrating Sound Level Meter Model NL-11, s/n 00150321, Cert Feb 2014 with

Rion Octave Band Filter Model NX-01A, s/n 11140944,

• iPhone3 with AudioTools App

• Weather Instruments (Aneroid barometer, Zeal Wet/Dry bulb Psychrometer, Suunto KB-14/360R compass,

Kaindl Windmaster 2 wind speed meter);

• 100 m measuring tape

Location definitions

The locations for measurements were defined as follows:

# Location Definition/comments

1 28 m

Shredder Mornington site test, 28.0 m from TANA Shredder engine at 320° to engine axis.

Microphone at 1.2 m height.

1a 14 m

Shredder Engine axis

Mornington site test, 14.0 m from TANA Shredder engine at 0° to engine axis. Microphone at 1.2 m height.

1b 14 m

Shredder 90° axis


1c 14 m

Shredder 180° axis


1d 14 m

Shredder 270° axis


2 1 Crooked Billet Rd

At corner of stockyards by house at 1 Crooked Billet Drive Microphone at 1.2 m height.

3 4 Weily Park Rd

Roadside verge by football ground opposite house at 4 Weily Park Rd. Microphone at 1.2 m height.

Aerial photos, map and photographs are on the following pages.

[Last revised 20/3/2016]

A2


Airphoto showing overview and monitoring locations around the Brighton study site

● Loc 2

Proposed Shred Position ●

Loc 3 ●

Locations shown to approximation. Image sourced from TheList 20/3/2016; note 200 m scale bar.

Changes are likely to have occurred since image capture.

A3


Map showing overview of the Brighton study site

● Loc 2

Proposed Shred Position ●

Loc 3 ●

Locations shown to approximation. Image sourced from TheList 20/3/2016; note 200 m scale bar.

Changes are likely to have occurred since image capture.

A4


Site photographs

Location 1, test operation of TANA Shredder cutting tyres, loading by excavator, 16/3/2016

View to proposed shredder location from 1 Crooked Billet Drive, Location 2, 16/3/2016

A5


Site photographs

View towards proposed shredder site from Location 3, 4 Weily Park Rd, 16/3/2016

Weather observations

Conditions were suitable for noise measurements.

Details are shown alongside.

Noise descriptions

For each location, ambient noise by source noted during the site visit is listed (in descending order of

significance by loudness, noticeability, duration and incidence):

Location 1

• Test operations TANA Shredder using excavator claw loading

Location 2

• Midland Highway traffic, 120° exposure arc, 80 and 110 km/h speed zones

• Grinder use

• Traffic events

Location 3

• Midland Highway traffic, 80 km/h speed zone, including trucks and hoons

• Grinder use

• Local traffic events

• Crickets

• Dogs

• Reversing alarms

Weather observations

Date 16/03/2016 16/03/2016

Location Mornington Brighton

Time 14:20 15:50

Temp °C 19 21

Relative Humidity % 58 52

Pressure hPa 1012 1018

Wind speed avg m/s 1.4 3.9

Wind speed max m/s 2.4 7.4

Wind direction SE NE

Cloud cover x/8 7 6

A6


Comments

� TANA Shark 440DT Shredder, Cummins QSX15 6 cylinder diesel, 439 kW at 2013 RPM.

Cooled by 7-blade fan, 0.9 m Ø. Mobile tracked unit, suitable for multiple use (wood, tyres etc)

� Test excavator Kobelco Geospec SK225SR fitted with claw grabber.

� Test tyre shredding was conducted at Mornington. Noise was dominated by engine, exhaust and

cooling fan of the TANA unit; no significant increment was contributed by actual shredding or the test

excavator. We recommend investigating the feasibility of installing a secondary muffler, or other

options for achieving lower noise emission.

� We confirm the implied recommendation of the IPM Safety report that hearing protection be used in

the vicinity of the operating shredder.

� Anticipate use at Brighton site for tyre shredding is 2 days/fortnight during normal working hours.

Anticipate wheeled loader use at Brighton (rather than excavator used for tests)

� Any tonal reversing alarms present on the Shredder, Loader or associated vehicles could be replaced by

broadband emitters to minimise nuisance to distant receivers.

� Two sensitive Brighton receiver locations were briefly monitored for ambient noise. In both cases the

ambient noise was dominated by highway traffic. Expected noise events not measured during the site

visits include local truck and train movements.

A7


Statistical analysis and measurements at Locations of noise over 1-10 minute periods, dB(A)

Location Shredder

320° 28 m, Mornington

Shredder 0° 14 m,

Mornington

Shredder 90° 14 m,

Mornington

Shredder 180° 14 m, Mornington


1 Crooked Billet Dv, Brighton

4 Weily Park Rd, Brighton

Date 16/03/2016 16/03/2016 16/03/2016 16/03/2016 16/03/2016 16/03/2016 16/03/2016

Time 13:43 13:43 13:50 13:48 13:57 15:45 16:08

Duration 10 min 1 min 1 min 1 min 1 min 10 min 10 min

Samples 6000 continuous continuous continuous continuous 6000 6000

Comment shredding shredding shredding shredding shredding ambient ambient

Lmax 84.0 - - - - 62.6 75.0

L0.1 83.5 - - - - 61.3 73.6

L1 82.6 - - - - 58.5 58.5

L5 81.8 - - - - 57.1 55.4

L10 81.3 - - - - 56.4 54.6

L50 79.8 - - - - 53.7 52.4

L90 78.7 - - - - 47.7 49.8

L95 78.4 - - - - 46.9 49.2

L99 77.8 - - - - 45.9 48

Lmin 76.3 - - - - 45.1 46.4

Leq A 80.1 86.2 84.4 82.9 82.5 53.9 54.0

A8


Statistical analysis, 10 minute periods measured noise

Barwicks Tyre Shred project, Mornington and Brighton, 16/3/2016

40

45

50

55

60

65

70

75

80

85

90

0102030405060708090100

Percentage of time noise level exceeded

No

ise l

evel

dB

(A)

Shredder 28 m, Mornington

16/03/2016 13:43


16/03/2016 15:45


16/03/2016 16:08

A9


Spectral (octave) analysis of measured noise

Location Shredder

320° 28 m, Mornington

Shredder 0° 14 m,

Mornington

Shredder 90° 14 m,

Mornington





Date 16/03/2016 16/03/2016 16/03/2016 16/03/2016 16/03/2016 16/03/2016 16/03/2016

Time 13:43 13:43 13:50 13:48 13:57 15:45 16:08

Duration 10 min 1 min 1 min 1 min 1 min 10 min 10 min

Event shredding shredding shredding shredding shredding ambient ambient

A 80.1 86.2 84.4 82.9 82.5 53.9 54.0

C 87.9 90.6 94.1 91.4 89.1 63.6 63.1

Duration 10 min 10 s - - - 10 min 10 min

Octave Hz 31.5 67.1 72.2 - - - 59.4 58.7

63 75.3 81.6 - - - 59.7 59.5

125 80.4 85.6 - - - 53.4 52.0

250 86.0 89.9 - - - 49.8 50.1

500 78.2 82.9 - - - 49.1 48.3

1k 71.1 79.8 - - - 51.7 51.9

2k 71.7 78.4 - - - 44.4 44.9

4k 66.8 74.0 - - - 32.5 33.0

8k 59.4 65.6 - - - 20.2 33.6

A10


Spectral (octave) analysis of measured noise

Octave band spectra of measured noise

Barwicks Tyre Shredder project, 16/3/2015

0

10

20

30

40

50

60

70

80

90

100

31.5 63 125 250 500 1k 2k 4k 8k

Frequency band (Hz)

dB

Shredder 28 m,

Mornington 16/03/2016

13:43 10 min shredding

Shredder 0° 14 m,



1 Crooked Billet Dv,

Brighton 16/03/2016

15:45 10 min ambient


16/03/2016 16:08 10 min

ambient

A11


Spectral (third octave) analysis of measured noise

Location

Shredder 28 m,

Mornington



Date 16/03/2016 16/03/2016 16/03/2016

Time 13:43 15:45 16:08

Duration 10 min 10 min 10 min

Event shredding ambient ambient

Band Hz 25 57.3 54.4 55.5

31.5 64.2 53.0 53.6

40 62.8 56.0 51.8

50 65.9 54.7 54.1

63 73.5 55.1 56.9

80 69.0 55.1 51.4

100 79.1 50.1 48.9

125 68.9 48.6 47.0

160 73.3 46.6 44.9

200 85.6 45.6 45.0

250 72.8 45.4 46.2

315 72.1 43.9 44.6

400 77.2 43.1 43.7

500 68.5 44.1 43.5

630 67.8 45.5 43.3

800 64.0 46.8 45.5

1k 65.7 47.8 48.2

1.25k 68.3 46.1 47.2

1.6k 67.4 42.4 43.0

2k 67.1 38.6 38.7

2.5k 66.3 35.0 35.7

3.15k 64.0 30.8 30.9

4k 61.8 26.5 27.6

5k 59.0 21.4 22.3

6.3k 56.8 17.4 20.4

8k 54.5 14.9 32.7

10k 50.8 12.5 24.9

FFT analysis of shredder noise at Location 1 peaked at 199 Hz

A12


Spectral (third octave) analysis of measured noise

Noise spectra at test and receiver locations, Barwicks Tyre Shredder project

Mornington shredding and Brighton ambient noise, 16/3/2016

20

30

40

50

60

70

80

90

25 31.5 40 50 63 80 100 125 160 200 250 315 400 500 630 800 1k 1.25k 1.6k 2k 2.5k 3.15k 4k 5k 6.3k 8k 10k

Frequency band (Hz)

dB

Shredder 28 m,



1 Crooked Billet Dv,

Brighton 16/03/2016


4 Weily Park Rd,

Brighton 16/03/2016


A13


Noise at 28 m from TANA Shredder, 10 minute period shredding logged starting 13:43, 16/3/2016

sound pressure level, sampled once per second, trace of dB(A)

30

35

40

45

50

55

60

65

70

75

80

85

90

1 61 121 181 241 301 361 421 481 541 601 661 721 781 841

Time (AEST)

No

ise l

evel

dB

(A)

Monitoring trace of shredder noise at Mornington

13:43 13:45 13:47 13:49 13:51 13:53

Noise was dominated by TANA Shredder engine (fan, motor and exhaust), excavator did not contribute to any significant degree.

A14


Noise at 1 Crooked Billet Drive, Brighton 10 minute period ambient logged starting 15:45, 16/3/2016


30

35

40

45

50

55

60

65

70

75

80

85

90

1 61 121 181 241 301 361 421 481 541 601 661 721 781 841

Time (AEST)

No

ise

le

ve

l d

B(A

)

Monitoring trace of ambient noise at 1 Crooked Billet Drive

15:45 15:47 15:49 15:51 15:53 15:55

Midland Highway traffic dominated the noise at this location.

A15


Noise at 4 Weily Park Rd, Brighton, 10 minute period ambient logged starting 16:08, 16/3/2016


30

35

40

45

50

55

60

65

70

75

80

85

90

1 61 121 181 241 301 361 421 481 541 601 661 721 781 841

Time (AEST)

No

ise

le

ve

l d

B(A

)

Monitoring trace of ambient noise at 4 Weily Park Rd

16:08 16:10 16:12 16:14 16:16 16:18

Midland Highway traffic dominated the noise at this location.

At 16:13 a local car passed by the Weily Park Rd monitoring location.

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