riley quarry project, nook - epa tasmania n and p to... · 2012-02-17 · pearu terts – field...

A1

Pearu Terts – Field data report for Riley Quarry project, Nook – May 2011

Riley Quarry project, Nook Field data report, May 2011

General

Riley Quarry’s near neighbourhood at Morgan Rd comprises large block semi‐bush residential lots serviced by

the sealed cul de sac. Low‐intensity farm lots occupy more distant lower slopes accessed by Morgan Rd and

Marshalls Rd. Measurements of ambient noise were undertaken at afternoon periods, at upper Morgan Rd.

Instruments used

Rion Precision Integrating Sound Level Meter Model NL‐11, s/n 150321, with

Rion Octave Band Filter Model NX‐01A, s/n 10851228, both Laboratory Certified December 2010;

Brűel & Kjær Statistical Noise Analyser Type 4426 s/n 957489, Laboratory Certified October 2007;

Brűel & Kjær Sound Level Calibrator Type 4230 s/n 1207368, Laboratory Certified December 2010;

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

Kaindl Windmaster 2 wind speed meter);

Hema Navigator 5” GPS, s/n HN5A1209001368

Fibreglass measuring tape;

Location description and noise observations

Position plotted on airphoto and plan on following pages

Location 1: Sited at roadside near saddle high point of Morgan Rd, by entrance to 147 and opposite 148.

Site details: adjacent to Aurora Pole 4 389785 bearing T65‐1043, relatively open of trees,

GPS UTM (1966) 55G 445056 E, 5425149 N, Microphone at 1.2 m height.

Ambient noise noted during the site visit included (listed in descending order of significance by loudness,

noticeability, duration and incidence):

Birds including crow and frequent small bird calls

dominated high frequency octave bands 1 kHz and over

Quarry activity ‐ Riley (and/or Boral), dominated lower frequency octave bands up to 500 Hz

thumping (jaw crusher assumed) 3‐5 per sec, undulating intensity up to 36 dB(A)

engines of machinery, loader and trucks

engine brakes, horn (not measured)

Dog barks 45‐50 dB(A), after 15:30 Local traffic (excluded 3 events)

Weather observations Date 20/5/2011

Location Loc 1

Time 15:40

Temp °C 13

Relative Humidity % 84

Pressure hPa 992

Wind speed average m/s calm

Wind maximum calm

Wind direction calm

Cloud cover x/8 1

Light aircraft (not measured)

Frog

Additional presences indicating further local noise sources noted:

excavator parked in paddock roadside wheelie bins out for council collection

slashed paddock areas firewood collection

A2


Airphoto showing neighbourhood Location 1

+

Location 1: +, plotted to approximate position.

Morgan Rd is a recent sealed road ending in cul de sac 150 m NW of Location 1

Image from Google sourced 23/5/2011, image origin date uncertain.

The image may predate new houses now existing at the Morgan Rd development.

A3


Map section showing Quarry and neighbourhood

The extract of 1:25000 Tasmap shows the Riley Quarry at blocks 0346‐0347

Note Boral operation at block 0341 and Morgan Rd subdivision at block 0318

Recent road and dwelling constructions not shown. Gridlines 1 km.

A4


Photographs

Location 1 by Aurora Pole, 20/5/2011

Location 1, opposite 148 Morgan Rd, 20/5/2011

A5


Statistical Analysis, ambient afternoon noise Location 1, 147/148 Morgan Rd, Nook, May 2011

25

30

35

40

45

50

55

60

0102030405060708090100

Percentage of time noise level exceeded

No

ise

leve

l d

B(A

)

Loc 1 20/05/2011 14:48

Loc 1 20/05/2011 15:02

Loc 1 20/05/2011 15:18

Loc 1 20/05/2011 15:29

Location Loc 1 Loc 1 Loc 1 Loc 1

Date 20/5/2011 20/5/2011 20/5/2011 20/5/2011

Time 14:48 15:02 15:18 15:29

Duration 10 10 10 10

Samples 6000 6000 6000 6000

L10 36.5 36.3 39.0 40.0

L20 35.0 34.5 36.5 37.5

L50 33.0 32.3 33.3 34.5

L90 31.3 29.8 30.5 32.0

L99 29.8 28.5 29.5 30.5

Leq(A) 35.1 34.0 35.7 36.9

Leq(C) 47.7 47.8

Comment dog

Quarrying on on on on

A6


Octave distribution of afternoon ambient noise Location 1, 147/148 Morgan Rd, Nook, 20 May 2011

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

Loc 1 20/05/201115:32 ambient

Location Loc 1

Date 20/05/2011

Start time 15:32

Noise ambient

Duration 10 s Leq

Octave Hz 31.5 45.1

63 46.3

125 43.4

250 34.4

500 32.5

1k 28.6

2k 28.3

4k 34.2

8k 27.1

Neighbourhood noise ‐ Octave spectral analysis

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D1

Pearu Terts – Field report for Riley Quarry project, Nook – July 2011

Riley Quarry project, Nook Supplementary field report, July 2011

General

Riley Quarry’s near neighbourhood at Morgan Rd comprises large block semi‐bush residential lots serviced by

the sealed cul de sac. Statistical and spectral measurements of ambient and drill test operation noise were

undertaken at afternoon periods, at upper Morgan Rd.

Drill test operation was measured for spectral distribution of noise at 7.0 m at contrasting orientations.

Riley Quarry was otherwise not operating during the visit.

Mr Riley’s sound level meter was tested against a certified calibrator.

Instruments used

Rion Precision Integrating Sound Level Meter Model NL‐11, s/n 150321, with

Rion Octave Band Filter Model NX‐01A, s/n 10851228, both Laboratory Certified December 2010;

Brűel & Kjær Statistical Noise Analyser Type 4426 s/n 957489, Laboratory Certified October 2007;

Brűel & Kjær Sound Level Calibrator Type 4230 s/n 1207368, Laboratory Certified December 2010;

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

Kaindl Windmaster 2 wind speed meter);

Hema Navigator 5” GPS, s/n HN5A1209001368

Fibreglass measuring tape;

Location description and noise observations

Position plotted on airphoto and plan on following pages

Location 1: Sited at roadside near saddle high point of Morgan Rd, by entrance to 147 and opposite 148.

Site details: adjacent to Aurora Pole 4 389785 bearing T65‐1043, relatively open of trees,

GPS UTM (1966) 55G 445056 E, 5425149 N, Microphone at 1.2 m height.

Ambient noise noted at Location 1 during the site visit included (listed in descending order of significance by

loudness, noticeability, duration and incidence):

Riley Quarry drill during test (continuous and sustained drilling during test) ‐ broadband noise, more noticeable at mid‐high frequency bands

Quarry activity – Boral operations ‐ thumping (jaw crusher assumed) 3‐5 per sec, with impulsive and modulating character

undulating intensity up to (max 44 dB(A), 53 dB(C))

‐ engines of machinery, loader and trucks, dumps

dominated lower frequency octave bands up to 500 Hz

Birds including crow, wattle bird and numerous small birds. Calls featured in high frequency octave

bands, 1 kHz and over. Weather observations

Date 28/7/2011

Location Loc 1

Time 15:30

Temp °C 10

Relative Humidity % 88

Pressure hPa 990

Wind speed average m/s 1.0

Wind maximum 2.6

Wind direction NW

Cloud cover x/8 8

Local traffic (excluded 1 pass event each 10 min period)

Burning off heaps 30 m away (8 kHz cracking)

Drill test locations: Sited at upper incline of Riley Quarry,

GPS UTM (1966) 55G 445119 E, 5425576 N,

Microphone at 1.2 m height at (a) 7.0 m to front and

(b) 7.0 m to rear quarter.

[Last revision Wednesday, 3/8/2011]

D2


Airphoto showing drill rig position and Location 1

+

+

Drill location: +, Location 1: +, plotted to approximate position.

Morgan Rd is a recent sealed road ending in cul de sac 150 m NW of Location 1

Image from Google sourced 23/5/2011, image origin date uncertain and may predate new houses.

There are likely to be changes in vegetation and cleared areas.

D3


Photographs

Drill rig prepared for noise test, located on upper incline, 28/7/2011

Close view of drill assembly and rig, 28/7/2011

D4


Photographs

Drill tests, from two orientations at 7.0 m, from front (left) and rear quarter (right), 28/7/2011

Comments

Daytime noise measurements were conducted under suitable conditions.

Ambient noise at Location 1 was higher than measured in May, partly due to light wind from NW from

direction of Boral operation.

Drilling during tests was sustained, whereas operational drilling would be for individual holes and fall

quiet during repositioning. It is anticipated that drilling would occur during a period of several days

perhaps several times a year, and only in the first year during incline construction would it be on the

southern exposure. Subsequent drilling would be within a crater at the top of the hill.

Drill noise is particularly concentrated around the drill bit driver, and the associated high frequency

noise is directed to the front and sides. Where possible, it would be beneficial to orient the bit away

from the neighbour cluster, using the body of the rig to shield the high pitch noise. The drill was

oriented side‐on in respect to Location 1. The remainder of the complex rig creates noise of similar

broadband nature to typical diesel machinery.

Boral crusher noise measures lower than drill noise at Location 1, but it is comparably noticeable due to

its impulsive and modulating character. Drill noise is continuous in character at Location 1.

D5

Drill test operation noise at 7.0 m ‐ Octave spectral analysis

Octave distribution of drill test noise at 7.0 m Riley Quarry incline, Nook, 28 July 2011

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

Drill 7.0 m front 28/07/201114:00 10 s Leq

Drill 7.0 m rear quarter28/07/2011 14:05 10 s Leq

Location Drill 7.0 m Drill 7.0 m

Date 28/7/2011 28/7/2011

Start time 14:00 14:05

Noise drill test drill test

Duration 10 s Leq 10 s Leq

Measured A 94.8 85.7

C 93.9 85.8

Octave Hz 31.5 65.9 66

63 81.6 77.7

125 76.7 76.2

250 77.7 77.3

500 84.4 76.8

1k 85.7 77.2

2k 90.1 77.7

4k 88.5 76.7

8k 87.7 73.3

Orientation front rear quarter


D6

Statistical Analysis, ambient afternoon and drill test noise Location 1, 147/148 Morgan Rd, Nook, July 2011

25

30

35

40

45

50

55

60

0102030405060708090100

Percentage of time noise level exceeded

No

ise

leve

l d

B(A

)

Loc 1 28/07/2011 14:34

Loc 1 28/07/2011 14:53

Location Loc 1 Loc 1

Date 28/07/2011 28/07/2011

Time 14:34 14:53

Duration 10 10

Samples 6000 6000

L10 51.5 44.0

L20 50.8 41.5

L50 49.0 38.5

L90 46.3 36.3

L99 42.3 35.0

Leq(A) 49.3 40.9

Comment test drill ambient


D7


Octave distribution of ambient and drill test noise Location 1, 147/148 Morgan Rd, Nook, 28 July 2011

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

Loc 1 28/07/201114:34 drill test

Loc 1 28/07/201114:53 ambient

Location Loc 1 Loc 1

Date 28/7/2011 28/7/2011

Start time 14:34 14:53

Noise drill test ambient

Duration 1 min Leq 1 min Leq

Measured A 49.6 42.8

C 55.5 45.1

Octave Hz 31.5 46.6 42.8

63 53.3 45.1

125 51.2 48.5

250 47.0 41.9

500 44.2 36.2

1k 43.2 32.5

2k 43.5 31.2

4k 37.1 26.5

8k 27.5 23.5

Drill test operation and ambient noise at Location 1 ‐ Octave spectral analysis

1

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

33 Falcon Rd Claremont 7011 Tasmania AUSTRALIA

ARCHITECTURAL ACOUSTICS NOISE CONTROL

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

Riley’s Quarry, Gravel Pit Road, NOOK, 12/8//2011 - Operations on the Crown of the Hill

S U M M A R Y.

Blasting: Calculations indicate that a maximum instantaneous charge (MIC) of 60 kg/delay produces a a maximum overpressure of 112 dB(Lin) and a ppv of 1.24 mm/s, at 550 m. There is no intention to operate the crusher at the crown of the hill.

Rock Drill: 1. A Tamrock Zoom Track Rock Drill DHA800 generates an calculated noise

level at the nearest neighbour 550 m away, of Leq = 35 dB(A) with little or no wind and Leq = 43 with a gentle breeze blowing from the quarry towards the nearest residence. This assumes a 3 m high bund noise barrier.

2. Using a 2 m bund wall, the drill generates a calculated noise level of 36 dB(A) with no wind and a noise level of 45 dB(A) with a gentle breeze towards the nearest neighbour.

3. However, drilling operations with no noise barrier berm, generate a calculated noise level of 47 dB(A) with no wind and 56 dB(A) with a gentle breeze blowing towards the nearest neighbour.

4. The ambient noise level at the quarry with the quarry shut is 34.1 dB(A) and the background L90 noise level was 26.3 dB(A), possibly less on occasions.

5. The average ambient noise level (calm conditions) at 147/148 Morgan Road was measured as Leq = 35.4 dB(A) obtained from 4 readings of 10 minutes each. The average background noise level was L90 = 30.9 dB(A).

6. It is recommended that a bund wall at least 2 m high be built around the rim before drilling starts. In the SSW direction to the nearest neighbour, the bund wall height is recommended to be 3 m. The bund could be built up of top soil, rocks, overburden and cleared trees, bushes and vegetation.

7. Access road drilling test at nearest residence indicated Leq = 49.3 dB(A) during drilling and 40.9 dB(A) when drilling stopped. This noise reduces as access road progresses toward the crown of the hill.

CLIENT: Mr. Paul Vlasich 19 Walker Street

Forth Tasmania 7312 Tel 6428 3925/mob 0407 871 640 e-mail: [email protected]

mailto:[email protected]

mailto:[email protected]

2

INTRODUCTION: Noise annoyance depends on the following factors:

1. the level of the existing ambient noise 2. the level of the new noise with the quarry in operation 3. whether the new noise has tonal components 4. whether the new noise has impulsive components 5. the time of the day the new noise occurs 6. whether the new noise carries unwanted intelligence such as waning announcements 7. noise annoyance is also dependent on the listener’s perception of whether the noise is

regretfully caused, imposed in ignorance or inflicted as an act of aggression. The Tasmania Quarry Code of Practice (June 1999), page 10 states: “With the exception of blasting where permitted, noise from activities in a quarry affecting residential premises, must not exceed 10 dB(A) above the normal ambient noise levels during daytime operations”. In relation to blasting, the Code states on page 12, “Blasting must be carried out such that, when measured at the curtilage of the nearest residence (or sensitive use) in other occupation or ownership, air blast and ground vibration comply with the following:

a) for 95% of the blasts, air blast overpressure must not exceed 115 dB(Lin, peak); b) air blast overpressure must not exceed 120 dB(Lin, peak) at all; and c) ground vibration must not exceed 5 mm/s peak particle velocity”.

Noise measurements were conducted on 17/12/2007 at two locations, with the quarry not operating, to obtain ambient and background noise levels. Noise measurements were conducted in the quarry on15 March 2009 and the results given in a report. More recent measurements were conducted on 20 May 2011 and the results form appendix A of this report. Tests of rock drill noise were undertaken July 2011, results presented as Appendix D. RESULTS: (Ambient Noise) Pages A1 to A6 give the results of field measurements performed May 2011. The main results are shown on page A5 and A6. In the table on page A5, Ln is the noise level exceeded for n% of the time. Hence, L90 is a good descriptor of the base or background noise level. L90 = 31.3 dB(A) means that for 90% of the 10 minute sample, that is, 9 minutes, the noise level was 31.3 dB(A) or more. Similarly, L10 is a good descriptor of the average of the higher noise events encountered. L10 = 36.5 dB(A) means that for 10 % or 1 minute, the noise level was 36.5 dB(A) or more. Leq is the equivalent ‘A’ weighted noise level. A fluctuating noise having an Leq = 35.1 dB(A) has the same acoustic energy as a steady noise of 34.1 dB(A). The results show that the average ambient noise level from 4 sets of measurements was Leq = 34.1 dB(A) at 147 Morgan Road verge. The average background noise level was L90 = 30.9 dB(A), again obtained from 4 sets of readings. The measurements were obtained with Riley’s quarry crushers not operating and personnel preparing to leave, it being Friday afternoon.

3

Quarry crusher noise was heard and reported in the results but telephone conversation with Mr Riley confirmed that they had shut down the crusher by 1430 h. Hence the quarry noise heard came from the nearby Boral quarry. Pages D6 and D7, July 2011 measurements indicated higher ambient noise on that occasion. However, despite the Boral operations, the measured ambient and background noise levels were low. ROCK DRILL NOISE: Access road construction. The site was visited on 28/7/2011 when a test drill was set up to monitor access road drilling noise at nearest neighbours. Pages D1 to D6 give the results of these measurements and analysis. During drilling, the 10 minute Leq = 49.3 dB(A) compared to an ambient noise level of 40.9 dB(A) when drilling stopped. The drill noise reduces as the drill moves further away towards the crown of the hill. Based on measurements at 7 m, the sound power level (SWL) of the drill is 120 dB(A) Operations at the crown of the hill. A Tamrock Zoom Track Rock Drill DHA800 generated a sound pressure level (SPL) at 80 m of 79.8 dB(A). This equates to a sound power level (SWL) of 126 dB(A). The sound pressure level at 550 m, due only to geometric spreading and not taking into account atmospheric absorption, noise barriers, excess attenuation due to ground cover and trees, would be: SPL = SWL – 20 log r – 8,

where r is the distance in meters.

SPL = 126 – 20 log 550 – 8 = 63.2 dB(A) The measured noise spectrum, at 80 m was used to calculate the noise level at the nearest residence, 550 m away. The noise was calculated using geometric spreading to 550 m and atmospheric absorption to 500 m. Excess attenuation for sound travelling over the ground and through trees was not calculated, but these would also attenuate the noise. Pages B1 and B2 show calculations of likely noise levels at the nearest neighbour 550 m away. They include effects of meteorological effects such as gentle winds blowing from the quarry towards the nearest house. Assuming a 3 m high bund wall noise barrier at the ridge, the rock drill, used on the crown of the hill is likely to generate a noise level at the nearest neighbour 550 m away of Leq = 36 dB(A) with no wind and 43 dB(A) with a gentle breeze.

4

Assuming a 2 m high bund wall noise barrier at the ridge, the rock drill, used on the crown of the hill is likely to generate a noise level of 36 dB(A) with no wind and 45 dB(A) with a gentle breeze blowing towards the nearest neighbour. Assuming no purpose built noise barrier, the noise level at the nearest neighbour is calculated to be 47 dB(A) with no wind and 56 dB(A) with a gentle breeze blowing towards the neighbour. Stronger winds increase the background noise level because of the wind in trees and bushes. EXCAVATOR NOISE: The Komatsu PC220 excavator is rated at 168 hp (ie., 125 kW). Australian Standard AS 2436-1981 “Guide to Noise Control on Construction, Maintenance and Demolition Sites” gives the range of measured A-weighted sound power levels as being in the range from 108 to 112 dB(A). To illustrate, at 550 m, considering only attenuation due to geometric spreading, that is, line of sight and no noise barriers or excess attenuation due to ground cover and trees, the noise level would be : SPL = SWL – 20 log r – 8, where r = distance in meters SPL = 112 – 20 log 550 – 8 = 49.2 dB(A) TRUCK NOISE: The Australian Standard AS 2436-1981 gives the sound power level of a 20 t truck as being in the range 103 to 108 dB(A). To illustrate, the noise level at 550 m would be, for the same conditions as for the excavator, that is, geometric spreading of sound: SPL = 108 – 20 log 550 – 8 = 45.2 dB(A). BLASTING NOISE AND VIBRATION: Pages C1 and C2 give calculations of the over pressure and peak particle velocities at 550 m. Using 15.5 kg MIC, the maximum overpressure = 108 dB(Lin) and the ppv= 0.42 mm/s. Using 21 kg MIC, the maximum overpressure = 109 dB(Lin) and the ppv = 0.54 mm/s. Using 60 kg MIC/delay, the maximum overpressure = 112 dB(Lin) and the ppv = 1.24 mm/s. These values meet The Quarry Code of Practice (QCP) requirements. During the access road construction, the nearest neighbour is 366 m away from the first drill hole. To meet the requirements of the QCP, the maximum instantaneous charge per delay is calculated to be 36 kg. This is calculated to generate a ppv = 1.6 mm/s at the nearest neighbour. See calculations on page C3.

5

DISCUSSION: The rock drill with a SWL of 126 dB(A) is the dominant noise compared to the excavator with a SWL of 112 dB(A and the truck with SWL of 108 dB(A). The combined SWL of the excavator and the truck is 113.4 dB(A), or 12.6 dB(A) less. The rock drill used in the 28/7/2011 noise test has a sound power level of 120 dB(A), or 6 dB(A) less than the Tamrock used in the calculations shown on page B2. As can be seen from page D 4, the noise at 7 m from the front of the drill was Leq = 94.8 dB(A) compared to Leq = 85.7 dB(A) at the rear quarter. There is benefit in orientating the drill so that the rear of the drill faces the neighbours. If for the sake of illustration, the rock drill generates 63.2 dB(A) at 550 m then the combined noise of the rock drill, excavator and the truck is 63.4 dB(A) at 550 m due to only geometric spreading. This is an insignificant difference. Consequently, excavator and truck noise were not calculated as they contribute only marginally to the noise from the crown of the hill. The quarry and quarry activities are not seen from the nearest residence due to the thick forest of trees. Consequently any received quarry activity noise is not the direct sound but attenuated sound. The intervening tree coverage provides noticeable attenuation of noise but which was not included in the calculations. The quarry operates during daylight and does not operate on Sundays. CONCLUSION: The measured ambient noise levels in terms of Leq indicate that the 10 dB(A) differential requirement of the Quarry Code of Practice, between the noise level with the quarry operating and when shut down, is likely to be met 550 m away. The ground vibration requirement of peak particle velocity (ppv) = 5 mm/s is also likely to be met for locations situated 550 m from the quarry, assuming a 15 kg to 60 kg /delay charge. The Quarry Code of Practice regarding the 120 dB(Lin) peak and the 115 dB(Lin) peak requirements are also satisfied. The World Health Organization’s (WHO) Guideline for noise levels outside bedrooms is that with the window open, Leq = 45 dB(A) and Lmax = 60 dB(A). These conditions too, are likely to be met for the rock drill operations at the crown of the hill but rock drill noise at the start of the access road has been measured at 49.3 dB(A). This noise is likely to reduce as the drill moves up the access road. The maximum instantaneous charge per delay at the start of the access road is calculated to be 36 kg in order to meet the QCP requirements. Pearu Terts

Terry Eaton Consulting Engineer ABN 94 809 092 464

10th May, 2011

AG & BJ Riley 156 Sprint Street SHEFFIELD Tas 7306

Dear Sir,

Addendum to Traffic Assessment Report

For Proposed Extension of Gravel Extraction

at Gravel Pit Road, Nook – September 2008

AG & BJ Riley are applying to increase gravel extraction for their pit at Gravel Pit Road,

Nook, from 50,000 tonne to 100,000 tonne. This report is provided as to the likely traffic

impact with the additional activity.

Previous Report of September 2008

This report covered the road facilities and traffic data with assessments on road safety and

traffic service for Nook Road, Gravel Pit Road and the Nook Road/Gravel Pit Road

junction.

The additional cartage may have some relevance to the traffic service level but with no

change to the other issues commented on in the September 2008 report.

Traffic Service

• Traffic Data

� Nook Road

Indicative 2030 year volume at 1,600 vehicles per day with distribution as per

the September 2008 report.

� Gravel Pit Road

Light vehicles allow at 40 vehicles per day.

29 Carey’s Road Bridgenorth Tas 7277

Tel/Fax: (03) 6330 1510

2

Commercial Vehicles

Annual Activity

Quantity Loaded Trips

Estimated Peak Day Volume

(2 way)

Gravel Pit (Riley) 100,000 tonne 4,000 40 *

Fine Crushed Rock (Boral)

60,000 tonne 2,400 40

Sheep Holding 60,000 No. 300 80

Total 6,700 160

Note – indications are there is likely to be little increase in the actual daily

delivery from the Riley gravel pit but the number of cartage days to increase

from some 160 to 200.

Assessment / Conclusion

The increased activity at the gravel pit is not seen as likely to increase the daily traffic use

on the serving road network such that the conclusions of the September 2008 report are

still considered valid.

The need to maintain Gravel Pit Road for heavy vehicle use and in particular the need to

ensure sufficient pavement width is maintained for two-way passage of such vehicles is

emphasised.

In terms of safety, ensuring the sight triangle to the north at the Nook Road/Gravel Pit

Road junction is maintained clear of vegetation and with the installation of “Truck Entering”

signs either side of the junction are considered important.

Terry Eaton

Traffic Assessment

Proposed Extension of Gravel Extraction

at Gravel Pit Road, Nook

S U B M I T T E D B Y :

T E R R Y E A T O N

T r a f f i c E n g i n e e r

2 9 C a r e y ’ s R o a d

B r i d g e n o r t h T a s 7 2 7 7

T E L / F A X : ( 0 3 ) 6 3 3 0 1 5 1 0

TE:SZ:YD

S E T P E M B E R 2 0 0 8

Traffic Assessment – Prosed Extension of Gravel Extraction at Gravel Pit Road, Nook 2

By Terry Eaton

C O N T E N T S

Page

1. INTRODUCTION..........................................................3

2. THE SITE.....................................................................3

3. THE PROPOSAL .........................................................4

4. ROAD FACILITIES.......................................................4

5. TRAFFIC DATA ...........................................................7

6. ASSESSMENT.............................................................8

7. CONCLUSION ...........................................................10


By Terry Eaton

1. Introduction

This report is provided as an assessment of the traffic impact for the

extension of the existing gravel extraction activity at AG & BJ Riley’s

quarry, Gravel Pit Road, Nook.

Preparation of this report has included a site visit and discussion with

the quarry operator.

2. The Site

The site is the existing gravel pit located off the end of Gravel Pit Road

some 1.5 kilometres from the Nook Road junction. Indications are that

the public section of Gravel Pit Road extends some 900 metres from

Nook Road with the remaining distance to the pit as a private gravel

access road.

The present quarry activities are based on contractor demand for

materials with the site operation to win, sieve and stockpile materials

ready for cartage, 4 employees are normally engaged in this process.

Cartage is generally batched with cartage at some 2,000 tonnes per

week with average orders of some 4,000 tonnes, i.e. cartage over 2

week periods.

Land uses in proximity are generally rural with the quarry in a forested

area with abutting rural land in use for grazing with a major sheep

export holding area on the south side near the gateway to the Quarry.

The loading facilities at the sheep holding pens are set back from

Grave Pit Road such that truck manoeuvring at this site is away from

the Gravel Pit Road carriageway. Closer to Nook Road is a Boral

Quarry site with activities on both sides of Gravel Pit Road with the

road crossing controlled by “Give Way” signs to maintain priority on

Gravel Pit Road. It is understood that the cartage from this site is

similar to the AG & BJ Riley demand of some 2,000 tonnes per week.


By Terry Eaton

3. The Proposal

The proposal is to extend the present quarry activities for another 15 to

20 years with production to some 50,000 to 60,000 tonnes/annum.

Indications are the quarry activity will generally be as per the existing

rate with the present employees and cartage up to some 2,000 tonne

per week.

4. Road Facilities

•••• Gravel Pit Road

This road could be classified as a dead-end local rural access

road serving local agriculture needs and the quarry activities.

The road is constructed for its public length of some 900 metres

with a minimum width of some 4.5 metres with widening up to

some 6.5 metres at corners and crests with formed shoulders and

grass verges. Some 100 metres from Nook Road there is a short

narrow section due to a road edge failure at a culvert.

Generally, the road standard could be considered adequate for

use by heavy cartage vehicles, particularly as there is no external

through traffic using the road with almost all use seen as relating

to the roadside commercial activities.

Washed out area


By Terry Eaton

The road profile is undulating and as a downgrade to Nook Road.

The alignment is generally as two straight sections joined by a

tight curve (some 80 metres radius) at the Boral site.

The road standard is seen as limiting travel speed to some 55 to

65 km/h.

Traffic accident information indicates no reported accidents on

this road for the last 5 years.

•••• Nook Road

This road provides a rural collector link between Sheffield Main

Road at Acacia Hills via Nook to Sheffield.

The road could be considered as a Category V road within the

Kentish Planning Scheme’s Road and Rail Asset Code, with the

primary purpose to provide access to rural properties with a

significant through traffic component.

The road is constructed with a sealed pavement some 6.0 metres

wide, gravel shoulders some 1.0 metres wide, side swale drains

and grass verges. Additional pavement width is provided at tight

curves to accommodate the swept path of semi-trailers.

The road alignment is a series of straights and relatively tight

curves with steep hill sections either side of the ridge at Gravel

Pit Road. The road between Gravel Pit Road and Sheffield Road

is considered of a high standard for the use and the terrain.

Hill section


By Terry Eaton

The road standard is seen as limiting travel speed to some 70 to

75 km/h in proximity to Gravel Pit Road.

Accident records indicate 10 accidents for the 3.3 kilometre

section from Sheffield Main Road to Gravel Pit Road for the last 5

years. The link accidents included 1 serious accident, 4 minor

accidents and 3 property damage with 2 serious accidents

recorded for the Sheffield Main Road/Nook Road junction.

•••• Nook Road/Gravel Pit Road Junction

This junction is near a crest on Nook Road and is constructed

with a short section of seal on the Gravel Pit Road approach.

A minor forest access road is located opposite Gravel Pit Road.

The throat length at the edge of the through carriageway is

widened to some 120 metres, with some 80 metres on the

approach and 40 metres on the departure to/from the centreline of

Gravel Pit Road the additional areas provide for left turn

approach/departure tapers.

The gradient on Nook Road past the junction is an upgrade from

North to South of some 4% with a downgrade of some 8% north

of the junction.

Sight distance at the Gravel Pit Road junction is some 175 metres

to the north and some 165 metres to the south. The sight distance

to the north does rely on maintaining tree/shrub clearance within

the site triangle.

Traffic accident information indicates no accidents at this junction

in the last 5 years.

View to south View to north


By Terry Eaton

5. Traffic Data


Traffic information indicates a volume of some 900 vehicles per

day on Nook Road near Sheffield Road. Allowance for traffic

growth at some 2% per annum suggests a year 2028 value of

some 1,550 vehicles per day. For assessment the peak hours

are provided for at 12% of the ADT with 70/30 split with the major

value for traffic toward Sheffield Road for the morning and the

reverse for the evening.


Light vehicle use on this road relates to the commercial activities

and is likely to be less than 40 vehicles per day. For the

commercial uses the following estimates are provided:

Annual

No. Loaded Trips

Estimated Peak Day Volume

(two-way)

Gravel Pit (Riley)

60,000 tonne

2,400 40

Fine Crushed Rock (Boral)

60,000 tonne

2,400 40

Sheep transport

60,000 300 * 80

Total 5,100 160

* volume in/out of holding area

Addition of the peak day heavy and light vehicles suggests a peak

ADT of some 200 vehicles with some 80% as heavy vehicles.


By Terry Eaton

6. Assessment

6.1 Road Safety


The assessment is that this road is satisfactory to cater for

the cartage of materials from Gravel Pit Road.

An assessment of the accident history based on the Traffic

Authority of New South Wales’ average accident rate for

main rural roads of 0.49 accidents per million vehicle

kilometres of travel indicates a critical accident rate of 1.48

accidents per million vehicle kilometres for the section from

Gravel Pit Road to Sheffield Road. The actual rate of 1.33

accidents per million vehicle kilometres is less than this

critical value indicating an acceptable level of safety safe .


In view of the use of this road by traffic generally local to the

conditions with no through traffic the road standard is

considered satisfactory provided the surface is maintained

and any emerging road hazards are addressed. With regard

to hazard the site visit found a short section of road near the

Nook Road junction where a culvert wash out has reduced

the road width at a low point (sag curve). The road is on an

embankment with the risk of further edge failure. Remedial

measures such as extension of the culvert, pavement

widening and consideration for installation of edge protection

are considered prudent improvements.


The available sight distance at this junction, minimum value

165 metres to the south, meets DIER requirements for an

approach speed of some 75km/h. The available sight

distances also meets truck stopping distance for approach

speeds of some 75km/h for the approach from the south and

some 100km/h for the approach from the north. Truck

stopping distance is considered the minimum standard to be

met with the available sight distance to the south considered


By Terry Eaton

consistent with the speed environment for the location. The

sight distance to the north is well in excess of truck stopping

distance due to the steep gradient.

Consideration could be given to the following measures:

(i) Maintain the sight triangle to the north by

keeping the area clear of shrubs and trees.

(ii) Installation of a W5-22 (B size) truck

warning sign with attached “Turning Traffic”

plate some 100 metres prior to Gravel Pit

Road for both approaches. These signs will

increase awareness of the truck

movements.

6.2 Traffic Service


The predicted peak hour traffic volumes indicate a high level

of service will be available for vehicles exiting Gravel Pit

Road with the practical absorption capacity for right turns

from Gravel Pit Road at some 400 vehicles per hour (gap

time 8 seconds and 5 second move up time – typical for

truck movements).

75

125

5

15

2028 Evening Peak Hour

Gravel Pit Road

Nook Road


By Terry Eaton

Comparison between the actual predicted turn volume of

15 vehicles and the practical absorption value of

400 vehicles is indicative that a high level of service will be

available.


The predicted peak hour flow of some 200 vehicles per hour

suggests a nominal level of service “C” value for Nook Road

with a lower service level for the hill section. However, the

use of Nook Road by heavy vehicles is seen as consistent

with the road classification as a rural collector.


The road standard with remedial repair work at the culvert

near Nook Road is considered satisfactory for the predicted

traffic volume of up to 200 vehicles per day.

The gravel surface is considered adequate particularly as the

use is generally by heavy vehicles and as there are no

residences close to the roadway, i.e. no dust nuisance issues.

7. Conclusion

A traffic assessment for extension of the AG & BJ Riley’s Gravel Pit

operations at Gravel Pit Road, Nook, indicates no significant traffic

safety or traffic service issues provided some road repairs including

pavement widening with consideration for edge protection at the

culvert on Gravel Pit Road near Nook Road are advanced. It is also

considered prudent to keep the sight triangle to the north of the Nook

Rd / Gravel Pit Rd. junction clear and install “Truck Entering” warning

signs on Nook Road either side of this junction.

Terry Eaton

riley quarry project, nook - epa tasmania n and p to... · 2012-02-17 · pearu terts – field...

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