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
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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;
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.
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.
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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.
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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.
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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
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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