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PROJECT: BRIDGEWATER SAWMILL EXPANSION
JOB NO: P18005
CLIENT: Porta Mouldings
PORTA BRIDGEWATER
SAWMILL EXPANSION
Environmental Effects Report
CBM Sustainable Design
PORTA BRIDGEWATER SAWMILL EXPANSION | ENVIRONMENTAL EFFECTS REPORT i
CBM Sustainable Design Pty Ltd
51 York St, PO Box 1971
Launceston Tasmania 7250 Australia
Telephone: (03) 63326988
Email: [email protected]
Date Purpose of Issue/Nature of Revision Revision No. Authorised by
25/07/2018
21/08/2018
10/09/2018
Draft submission to EPA
Updated following EPA comments
Updated following comments from EPA air emissions section
01
02
03
SD
SD
SD
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Contents
1 Introduction ............................................................................................................ 1
2 Part A - Proponent Information .............................................................................. 2
2.1 Contact Details ............................................................................................... 2
2.1.1 Proponent ................................................................................................ 2
2.1.2 Consultant ............................................................................................... 2
3 Part B – Proposal Description ................................................................................ 3
3.1 Description of proposed activity ...................................................................... 3
3.1.1 General description.................................................................................. 3
3.1.2 Industry standards and guidelines ........................................................... 6
3.1.3 Timeframe ............................................................................................... 7
3.1.4 Operating hours ....................................................................................... 7
3.1.5 Production rates ...................................................................................... 7
3.2 Proposal area ................................................................................................. 7
3.2.1 General site description ........................................................................... 7
3.2.2 Local climate............................................................................................ 8
3.2.3 Current and historical site use ............................................................... 11
3.2.4 Land tenure ........................................................................................... 11
3.2.5 Land zoning ........................................................................................... 12
3.2.6 Surrounding land use ............................................................................. 12
3.2.7 Geology and soils .................................................................................. 13
3.3 Rationale and alternatives ............................................................................ 13
3.4 Planning information ..................................................................................... 14
3.5 Existing activity ............................................................................................. 14
3.5.1 Current operations ................................................................................. 14
3.5.2 Environmental compliance ..................................................................... 15
4 Part C – Potential environmental effects .............................................................. 16
4.1 Flora and fauna ............................................................................................ 16
4.2 Aquatic environment and stormwater ............................................................ 16
4.3 Significant areas ........................................................................................... 17
4.4 Air emissions ................................................................................................ 17
4.4.1 Gas fired boiler ...................................................................................... 19
4.4.2 Reconditioner ........................................................................................ 19
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4.4.3 Biomass boiler ....................................................................................... 20
4.4.4 Sawmill .................................................................................................. 20
4.4.5 General .................................................................................................. 21
4.5 Liquid effluent ............................................................................................... 21
4.6 Solid wastes ................................................................................................. 23
4.7 Noise emissions ........................................................................................... 24
4.8 Transport impacts ......................................................................................... 26
4.9 Other off-site impacts .................................................................................... 27
4.10 Hazardous substances ................................................................................. 27
4.11 Site contamination (historical) ....................................................................... 27
4.12 Heritage ........................................................................................................ 28
4.12.1 European heritage ................................................................................. 28
4.12.2 Aboriginal heritage ................................................................................. 28
4.13 Sites of high public interest ........................................................................... 29
4.14 Monitoring ..................................................................................................... 29
4.15 Rehabilitation ................................................................................................ 29
5 Part D – management commitments .................................................................... 30
6 Part E – Public and stakeholder consultation ....................................................... 31
7 References .......................................................................................................... 32
List of Figures
Figure 1 Process flowchart for proposed saw milling operations and biomass boiler..... 4
Figure 2 Schematic diagram of the additional saw milling equipment to be installed ..... 5
Figure 3 Process flowchart for existing green sawn operations with proposed changes
highlighted in yellow ...................................................................................................... 6
Figure 4 Average monthly rainfall for Hobart (Ellerslie Rd) Bureau of Meteorology site
for the period 1882 – 2018 ............................................................................................ 8
Figure 5 Rose of average wind direction versus wind speed at 9am at the Hobart
(Ellerslie Rd) Bureau of Meteorology site for the period 1882 – 2010 ............................ 9
Figure 6 Rose of average wind direction versus wind speed at 3pm at the Hobart
(Ellerslie Rd) Bureau of Meteorology site for the period 1882 – 2010 .......................... 10
Figure 7 Average monthly minimum and maximum temperatures at the Hobart
(Ellerslie Rd) Bureau of Meteorology site for the period 1882 – 2010 .......................... 11
Figure 8 Cadastral parcels with zoning overlay in the vicinity of the subject site, which
is shown with a hashed outline ................................................................................... 13
List of Tables
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Table 1 Summary of atmospheric emissions ............................................................... 18
Table 2 Relevant receivers in proximity to the project ................................................. 19
Table 3 Sampling results of condensate effluent and comparision to industry averages
from Dare et al. (2003) ................................................................................................ 22
Table 4 Summary of noise generating equipment SPLs .............................................. 24
Table 5 Summary of predicted noise emissions at relevant receptor locations and
relevant criteria ........................................................................................................... 25
Table 6 Traffic movements associated with current site operations ............................. 26
Table 7 Traffic movements associated with expanded site operations ........................ 26
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1 Introduction
Porta Mouldings operates an existing timber drying, conditioning and finishing
operation at 112 – 114 Cove Hill Rd, Bridgewater. This proposal involves the
installation of saw milling equipment at the site and an increase in the maximum
production limit from 4,500 m2 to 7,000 m2 per annum.
A Notice of Intent was submitted to the Environment Protection Authority (EPA) on
17/04/2018, and a determination was subsequently made that the proposal would be
assessed as a class 2A assessment under the Environmental Management and
Pollution Control Act 1994 (EMPC Act). Guidelines for preparation of the Environmental
Effects Report (EER) were received on 18/05/2018.
This EER has been developed in accordance with these guidelines for the purpose of
informing the Board of the EPA of the environmental effects and proposed
management measures associated with this project.
An assessment of potential impacts of the project on matters of national environmental
significance under the Environment Protection and Biodiversity Conservation Act 1999
has been undertaken. It concluded that there is a very low risk of significant impacts to
Matters of National Environmental Significance, and thus a referral to the
Commonwealth under this Act is not required.
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2 Part A - Proponent Information
2.1 Contact Details
2.1.1 Proponent
Name of proponent: Porta Properties No 2 Pty Ltd
Registered address of proponent 224-256 Heidelberg Road, Fairfield,
Victoria 3078
Postal address of proponent P.O. Box 195 Fairfield, Victoria 3078
ABN number 58 144 694 824
ACN number (where relevant) 144 694 824
Contact person’s details:
Name Mr Warrick Batt
Telephone number 03 9488 3222
Email address [email protected]
2.1.2 Consultant
This EER has been prepared by Sam Dingemanse of CBM Sustainable Design
([email protected], 03 6332 6988).
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3 Part B – Proposal Description
3.1 Description of proposed activity
3.1.1 General description
The project involves the installation of saw milling equipment at Porta’s Bridgewater
site to enable the milling of hardwood logs in addition to its existing timber drying,
conditioning and finishing operations.
This additional equipment consists of:
Twin circular saw for ripping whole logs
Twin band saw for further ripping of large product
Single circular saw (one-man bench) for ripping smaller product
Multi saw edger for finishing product
Various chain and belt driven conveyors and sorting tables for moving product
within the shed.
Figure 1 shows the process flowchart for this additional equipment, as well as the
various product and waste streams (solid, liquid and air emissions). This equipment,
with associated control systems and electrical services will be housed in a new 2,200
m2 partially open sided shed. The equipment is being purchased directly from Barber’s
Sawmill in Launceston, which is being decommissioned.
The following items will also be included in the proposed expansion:
Waste chipper plant and feed / output conveyors housed in an enclosed
structure adjacent to the shed;
Sawdust collection and storage system;
Additional storage building of approx. 1,800 m2 to accommodate increased
product volumes;
New administration building of approx. 130 m2;
Log storage area of approx. 2400 m2, with irrigation from stormwater pond;
Installation of biomass boiler fed from onsite wood waste;
Installation of 500 L fuel storage container;
Second site entrance to allow separation of light and heavy traffic flows;
Enlargement of stormwater pond and reconfiguration to water retention for
onsite reuse (log spraying).
This will allow Porta to receive and saw green hardwood logs directly, eliminating the
need to outsource this component of its timber supply chain.
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Figure 1 Process flowchart for proposed saw milling operations and biomass boiler
The general milling process is shown in Figure 2 and is described as follows: large
whole logs will be loaded onto a rail-mounted sled which feeds the twin circular saw for
ripping. The ripped timber then passes via conveyor to the twin band saw, where it is
ripped into smaller sections. Smaller logs may bypass the twin circular saw and be fed
to the twin band saw directly. The product then again travels via conveyor to the single
circular saw (one-man bench), where it is again ripped to approximately the correct
size for the desired product. Some product may be stacked and taken from the mill at
this stage if rough-sawn timber is desired. Conveyors then take the remaining product
to the edger (multisaw), where it is fed by hand for four-sided thicknessing. The output
product is then stacked to be dried or sent to the existing mill for further processing.
Offcuts from these various stages are either automatically or manually placed onto the
chipper feed conveyor, where it is fed from the mill shed to the chipper shed for
chipping. Output feed from the chipper is then fed via conveyor to a storage bund.
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Figure 2 Schematic diagram of the additional saw milling equipment to be installed
The proposed layout of the new facilities at the Bridgewater site is shown in drawings
A101 and A102 attached as Appendix 1.
The volume of product produced will increase to a maximum of 7,000 m3 per annum. In
addition, there will be an increase in the volume of raw material received to the site to a
maximum of 17,500 m3 per annum, due to the fact that green logs will now be received.
Figure 3 shows the process flowchart for the existing site operation, which involves air
and kiln drying green sawn timber, and sorting, docking and packing of dry product for
dispatch. The yellow highlighted processes are proposed changes/additions through
this project, being the installation of a biomass boiler to supplement the current gas
boiler and reconfiguration of the kiln condensate to report to the stormwater pond.
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Figure 3 Process flowchart for existing green sawn operations with proposed changes highlighted in yellow
3.1.2 Industry standards and guidelines
This activity will be undertaken in accordance with the Sawmill Environmental Code of
Practice 1995, which documents acceptable standards for sawmills in regards to the
management of potential environmental impacts. The code has been referenced
throughout this report to demonstrate compliance with the acceptable standards of the
code.
Porta is committed to sourcing timber from sustainable and environmentally
responsible resources. Porta holds Chain of Custody under the three national and
internationally recognised and accredited organisations:
Forest Stewardship Council® (FSC®)
Australia Forest Certification Scheme (AFS)
Programme for Endorsement of Forest Certification (PEFC™)
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3.1.3 Timeframe
Upon receipt of all approvals, the timeframe for the project is approximately 11 months,
during which time the currently operations will continue as normal. It consists broadly of
the following:
Site civil works – 2 months
Construction of facilities and upgrade of site electrical infrastructure – 6 months
Commissioning of saw milling equipment – 3 months.
The operation of the redeveloped site will continue for the foreseeable future.
3.1.4 Operating hours
The current site EPN has restricts operational activities to the following times:
0700 to 1800 hours Monday to Friday;
0900 to 1800 hours on Saturday;
1000 to 1800 hours on Sundays or public holidays.
The operation of kilns, reconditioners and boilers are permitted 24 hours per day,
seven days per week.
There is no there is no proposed change to these operating hours as a result of this
proposal.
3.1.5 Production rates
The current site EPN limits production to 4,500 m3 per annum. This proposal includes a
request to increase the annual production to 7,000 m3.
3.2 Proposal area
3.2.1 General site description
The site consists currently of two titles: 144927/4 and 144927/5, with a total area of 6.51
ha. It is located in an industrial precinct and is heavily modified from previous
agricultural activities, with no remnant native vegetation present at the site.
The northern half of the site contains buildings, timber storage and access roads, while
the southern half of the site is generally undeveloped other than an existing stormwater
pond at the south eastern corner (approximate capacity of 1.3 ML). The proposed
development will predominantly occur in this undeveloped southern area.
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The site is relatively flat with a minor gradient falling to the south east. A survey was
conducted of the southern half of the site, this area ranges from 51m AHD at the north
west of this area to 45m AHD to the south east of the site.
The nearest surface water body is the Jordan river located approx. 350m to the east of
the site.
The land capability class is 5+4, being at least 60% Land unsuited to cropping and with
slight to moderate limitations to pastoral use, up to 40% Land well suited to grazing but
which is limited to occasional cropping or a very restricted range of crops.
3.2.2 Local climate
The nearest Bureau of Meteorology weather station with comprehensive records is
Hobart (Ellerslie Rd). This station is approximately 20km south of the subject site.
Rainfall is very consistent throughout the year, with a mean annual average of 614mm
(Figure 4).
Figure 4 Average monthly rainfall for Hobart (Ellerslie Rd) Bureau of Meteorology site for the period 1882 – 2018
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Winds are very consistent in the morning, being predominantly north and north-
westerly (Figure 5). In the afternoon the wind direction is more varied, being
predominantly north-west and south-east (Figure 6).
Figure 5 Rose of average wind direction versus wind speed at 9am at the Hobart (Ellerslie Rd) Bureau of Meteorology site for the period 1882 – 2010
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Figure 6 Rose of average wind direction versus wind speed at 3pm at the Hobart (Ellerslie Rd) Bureau of Meteorology site for the period 1882 – 2010
Temperatures in the region are typical of a cool temperate climate, with an average
monthly maximum temperature range of 11.7 °C to 21.7 °C and an average monthly
minimum temperature range of 4.6 °C to 12.1 °C (Figure 7).
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Figure 7 Average monthly minimum and maximum temperatures at the Hobart (Ellerslie Rd) Bureau of Meteorology site for the period 1882 – 2010
3.2.3 Current and historical site use
The current use of the site is a timber processing facility. It was constructed in 2006
under planning permit DA25/244 issued by the Brighton Council.
The land surrounding the site was approved to be developed as a wrecking yard,
stables, training track and caretaker’s residence in 1986 (DA1986/03). The wrecking
yard building and caretaker’s residence are still present adjacent to the site, however
the wrecking yard building is unused and dilapidated. The Brighton Council has
confirmed that the caretaker’s residence (110 Cove Hill Rd) is approved only as
ancillary or incidental to an industrial use (given that residential use is prohibited in the
industrial zone) and thus not been considered as sensitive receiver in respect of the
site emissions.
The lot was created in 1997 when a subdivision of the land was approved (planning
permit SA1997/10) to create 7 lots and retain the wrecking yard building and
caretaker’s residence on a balance lot.
3.2.4 Land tenure
The site consists currently of two titles: 144927/4 and 144927/5. Both sites are owned by
Porta Properties No 2 Pty Ltd, the proponent of this development.
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3.2.5 Land zoning
The property is zoned General Industrial under the Brighton Interim Planning Scheme
2015.
3.2.6 Surrounding land use
The site is located in an industrial precinct, in an area of general industrial zoning. The
adjacent properties to the east and west of the site are currently undeveloped. A large
quarry is situated to the north-east of the site, and a small farm is located to the north-
west.
There is light industrial zoning to the south of Cove Hill Rd, in which a number of
manufacturing and fabrication operations are located.
There is general residential area south of the light industrial precinct. The nearest
residence is approximately 250m from the site boundary. No other sensitive uses exist
in proximity to the site.
There is a waste transfer station located to the south-east of the site, and open space
zoned land further east, forming the riparian zone of the Jordan River.
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Figure 8 Cadastral parcels with zoning overlay in the vicinity of the subject site, which is shown with a hashed outline
3.2.7 Geology and soils
The geology of the site is mapped as Tholeiite basalt (Forsyth, 2002). The geotechnical
investigation undertaken for the project identified silty and sandy clay to a depth
ranging from 0.7 – 1.7m, with underlying weathered rock (Strata Geoscience and
Environmental, 2018). It assessed the erosion potential of the soil as ‘moderate -
dispersive soil phases possible’.
There are no areas mapped as high probability of acid sulphate soil, nor are there any
acid sulphate soil sites recorded in the Tasmanian Acid Sulfate Soils Information
database, in proximity of the site.
3.3 Rationale and alternatives
The key driver of the project is to allow Porta to receive and saw green hardwood logs
directly, eliminating the need to outsource this component of its timber supply chain.
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Currently the site receives sawn timber from other sawmills, which then undergo further
processing, and this project will ensure that Porta has control over its timber supply
chain from log to finished product at the one facility.
The proponent also considered purchasing an existing sawmilling operation. This
would have negated the need to obtain approvals for, and construct the sawmill. There
would however have been logistical and management challenges and costs with
operating two discrete operations.
3.4 Planning information
The site is zoned General Industrial under the Brighton Interim Planning Scheme 2015.
Resource Processing is a permitted use in this zone. There is no proposed change to
this existing use as a result of this project as the site upgrade does not change the
major activity under taken at the site (timber processing). The site operates under an
existing planning permit DA05/244 dated 31/08/2005 and EPN 8779/1 dated
20/02/2013.
A planning application for the proposed works was submitted to Brighton Council on
the 5th June 2018. This included a Planning Application – Supporting Submission
(attached as Appendix 2) which provides a detailed assessment of the development
against the relevant sections of the planning scheme.
3.5 Existing activity
3.5.1 Current operations
Porta currently outsources milling of its hardwood logs to other sawmills, and receives
sawn green hardwood at the Bridgewater site. This product then undergoes air and kiln
drying, conditioning and finishing at the site, prior to transportation interstate for further
finishing at Porta’s moulding factory in Melbourne, Victoria and/or for sale as final
product. This is described further in section 3.1.1.
The site was constructed in 2006 and consists of the following:
Main product finishing building with adjacent office and amenities area;
Two buildings for product storage;
Kiln and reconditioner (total capacity 60 m3) driven from 450 kW gas boiler
Timber yard for air drying of timber.
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3.5.2 Environmental compliance
Environmental compliance of the operation is currently regulated under EPN8779/1
dated 20/02/2013. The maximum allowable production is 4,500 m3 of product per
annum. There is no requirement for environmental monitoring under the current permit.
There have been no known public complaints regarding the site operations since its
establishment in 2006.
There have also been no known breaches of the regulatory conditions or
contraventions of environmental law.
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4 Part C – Potential environmental effects
4.1 Flora and fauna
The site is heavily modified, with no remnant native vegetation present. This is
reflected by the TASVEG mapping which shows the entire site as Urban areas (FUR).
As such, no native vegetation will be cleared as a result of the proposed works.
A Natural Values report (attached as Appendix 3) was generated for the subject site
and 500m buffer from the site boundary. There are no threatened flora or fauna
species, raptor nests or threatened communities recorded within this search area.
Thus, there is no risk of impacts to flora and fauna resulting from the proposed works.
4.2 Aquatic environment and stormwater
The nearest waterway to the site is the Jordan River, located approximately 350 m to
the east of the site boundary. The Jordan River has its headwaters at Lake Tiberias,
around 40km to the north-east of the site. It eventually empties into the River Derwent
at Herdsmans Cove, to the south of the site.
Currently, all site stormwater other than roof catchment is diverted via open swale drain
to the stormwater detention pond located at the south east of the site. This has a
capacity of approximately 1.3 ML. There is an additional 200 kL of tank water storage
fed from the main building roof. This is used as the water supply for the reconditioner.
A 150 mm diameter pipe releases stormwater from the detention pond to the
stormwater swale in the Cove Hill Road reserve. This stormwater drain is assumed to
eventually drain to the Jordan river to the east of the site.
It is proposed to expand the existing stormwater system to ensure it complies with the
Stormwater Management Code in the Brighton Interim Planning Scheme 2015 for the
redeveloped site, as well as providing water storage for maintaining moisture levels in
logs stored on site.
Specifically, the existing pond storage will be increased to 1.9 ML by enlarging the
surface footprint, and a retention volume will be developed by installing a concrete pit
surrounding the discharge outlet. This will allow the pond to function as both retention
(for reuse of stormwater for log watering) and detention. In addition, another 200 kL of
tank water storage will be installed, to be fed from the new building roof.
During the pond expansion, a clay lining will be constructed at a suitable thickness to
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minimise permeability and the risk of stormwater loss to groundwater.
This additional storage was calculated to comply with the Stormwater Management
Code requirements of being able to accommodate a storm with an ARI of 50 years.
The proposed storage can provide a maximum of 120 minutes of detention at this
storm intensity.
The pond will improve stormwater quality by settling out suspended solids and promote
predominantly aerobic biological treatment of nutrients and organic pollutants in the
stormwater. This will effectively ensure that on the occasions when stormwater does
leave the pond via the overflow connection to the road stormwater swale drain, the
quality has been improved via a reduction in suspended solids and nutrients.
In order to minimise organic contamination of stormwater, the site excluding the log
storage area will be tidy by minimising the accumulation uncontrolled wood waste such
as sawdust, woodchips, offcuts and bark. A layer of wood waste will be maintained at
the log storage area to prevent any gravel from being transferred with the logs and
damaging the saws. The log storage area will drain to the stormwater pond, which will
prevent any stormwater runoff from this area leaving the site directly.
Commitment 1 – the site will be kept tidy by removing and disposing of uncontrolled
wood waste from the roadways, non-log storage areas and undeveloped areas.
4.3 Significant areas
The proposal site is not within or adjacent to any reserved areas. The nearest reserved
area is a public reserve located 150 m to the south-east of the site at its nearest point.
Thus, there is no potential for adverse impacts on any reserved areas.
4.4 Air emissions
Atmospheric emissions will occur from a number of sources at the redeveloped facility,
with the major sources of emissions being combustion products from steam/hot water
generation, sawdust from milling operations and general dust from use of the internal
roads and laydown areas. These are discussed further below, and summarised in
Table 1.
The site currently uses approximately 4,500 GJ of natural gas per annum. This will
decrease to 4000 GJ, reflecting the fact that the gas driven boiler driving the kilns will
be replaced with a biomass boiler, as well as an increase in the gas usage for the gas
burners in the reconditioner.
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Table 1 Summary of atmospheric emissions
Equipment or process
Type Composition Quantity
Reconditioner Fugitive vapour emissions when doors are opened
Gaseous combustion products from the exhaust.
Water vapour with some volatile organic compounds (VOCs)
The vast majority of combustion products is CO2 and water vapour. Minor quantities of CO and NOx emissions.
Approx. 100,000 L per annum
134 t of CO2 per annum
Kiln Point vapour emission from roof vents
Water vapour Approx. 1.1 ML per annum
Gas boiler Gaseous combustion products from the exhaust.
The vast majority of combustion products is CO2 and water vapour.
Minor quantities of CO and NOx emissions.
97 t of CO2 per annum
Biomass boiler
Gaseous combustion products from the exhaust.
The vast majority of the combustion products are CO2 and water vapour.
Minor quantities of CO, PM and NOx emissions.
Unknown
Sawmill Minor fugitive sawdust emissions from milling operations
Hardwood sawdust Unknown
General Dust Gravel fines from roadways
Unknown
Drawing A109 Air Emissions attached as part of Appendix 1 shows the location of
these atmospheric emissions on the site, and the proximity to relevant receiver
locations in the vicinity.
These include the surrounding industrial activities (including residences located in the
general industrial zone that are approved for use only as caretaker’s residences
ancillary to an industrial use) as well as the nearest sensitive receiver (residence) to
the south (Table 2).
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Table 2 Relevant receivers in proximity to the project
Designation Description Use Distance from project site boundary
Easting Northing
A Nearest residential boundary
Residential 250 m 520968 5268312
B Western dwelling 1 Industrial 75 m 520731 5268706
C Western dwelling 2 Industrial 190 m 520624 5268770
D Engineering workshop
Industrial 230 m 520574 5268686
E Polyfoam manufacturing
Industrial 30 m 520767 5268559
F Landscaping/ nursery
Industrial 190 m 521142 5268575
4.4.1 Gas fired boiler
The two drying kilns are heated using hot water from a gas fired boiler. This consumes
approximately 1,900 GJ of natural gas per annum.
The combustion of natural gas (predominantly methane) produces carbon dioxide and
water. Minor amounts of nitrogen oxides (NOx) and carbon monoxide are also
produced, but this is of minimal quantities in modern gas fired boilers.
This proposal includes the replacement of the gas fired boiler with a biomass boiler,
and thus emissions from this activity will cease at this time.
The kilns and boiler have been in operation at the site for over 10 years, in which time
there have been no complaints for neighbouring properties regarding associated air
emissions. This demonstrates that the emissions do not create an environmental
nuisance.
4.4.2 Reconditioner
The reconditioner uses steam produced by two gas-fired immersed tube burner steam
baths. This consumes approximately 2,600 GJ of natural gas per annum. As with the
gas boiler, carbon dioxide and water are produced during the combustion of natural
gas, with minimal quantities of NOx and CO also produced.
Vapour is released from the reconditioner when the doors are opened at the
completion of each cycle. This vapour is predominantly water, with small quantities of
VOCs which are released from the timber during the reconditioning process.
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As with the gas-fired boiler, air emissions associated with the reconditioner have never
attracted complaints from neighbouring properties, demonstrating that they do not
create an environmental nuisance.
4.4.3 Biomass boiler
This proposal incorporates the replacement of the gas fired boiler with a biomass fired
boiler. This would be fed from woodchips and sawdust produced on site, with a total
consumption of approximately 450 t of wood waste per annum.
The boiler will be rated at 145kW, and will produce water at 85 °C, filling a 1000 L
insulated hot water buffer tank. This tank will supply hot water for the two drying kilns,
as well as supplying a heat exchanger for the reconditioning kiln.
The boiler will have automated fuel feed supply and ash removal to maximise
combustion efficiency and minimise adverse atmospheric emissions. It should be noted
that wood waste is a renewable energy source, and thus the replacement of the natural
gas fired boiler will reduce associated greenhouse gas emissions by approximately 97 t
CO2 e per annum.
Emission control most suited to the planned boiler system is a baghouse fabric filter
system. Fabric filters installed as a baghouse are better able to reduce fine particulate
matter (PM) emissions than other emissions control solutions and are the intended
choice in this application. Depending on the design and choice of fabric, control
efficiencies of more than 99 percent for PM2.5 and PM10 can be achieved by fabric
filters and baghouses.
As such, the proposed biomass boiler can be engineered to ensure its compliance with
the Environment Protection Policy (Air Quality) 2004 in-stack concentration limit of
100mg/m3 for particulate matter.
Commitment 2 – The biomass boiler will be designed, including a baghouse fabric filter
system if required, to ensure it complies with an in-stack concentration limit of
100mg/m3 for particulate matter.
4.4.4 Sawmill
The capture and disposal of sawdust is already well managed at the facility, through a
blower system which captures the sawdust at each saw and transports it to a covered
storage hopper. This system will be expanded to incorporate the proposed additional
saws, and thus will effectively manage sawdust emissions.
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The site currently produces approximately 240 t of sawdust per annum. It is taken off-
site and beneficially reused as animal bedding.
Commitment 3 – A sawdust capture and storage system will be installed on all
additional saw milling equipment. This system will be serviced and maintained as per
manufacturer’s recommendations, to ensure system continues to operating effectively.
4.4.5 General
Dust will be produced from vehicle operations on the internal roads and laydown areas.
Vehicles include staff and service passenger vehicles, truck movements for transport of
incoming and outgoing product and forklift usage between the storage sheds.
Dust generation will be minimised by appropriate maintenance of the internal road
system and implementing a speed restrictions on vehicles. Dust generation will be
monitored by staff, and roads will be watered if dust generation becomes a nuisance to
surrounding businesses.
Commitment 4 – Internal access roads will be appropriately maintained to minimise
dust generation.
Commitment 5 – Visual monitoring of dust generation will be conducted by staff. If it is
determined, through visual monitoring or public complaints, that dust from access
roads is an nuisance to neighbours, then roads will be swept or watered to mitigate
dust generation.
Commitment 6 – Internal site traffic will be speed limited to 10 km/hr.
Commitment 7 – The log yard will be maintained by regular removal of loose wood
waste, such that fugitive dust emissions are kept to a minimum.
Commitment 8 – Dust suppression in the log yard will be assisted by the use of water
irrigation spray.
4.5 Liquid effluent
The site is serviced for sewerage and water, and human effluent from the staff
amenities is discharged to sewer.
The majority of water usage at the site is for the operation of the reconditioner. The site
uses approximately 250 kL per annum of water from the mains connection, which
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provides any shortfall from the water collected in the 200 kL of tank storage connected
to the building roofs. Mains water usage is not expected to substantially increase with
the proposed site upgrade as the additional water required for log spraying will be
provided by the stormwater pond and additional 200 kL of tank storage connected to
the new shed roofs.
The only liquid effluent produced by the proposed activity is the condensate produced
by the reconditioner. This condensed vapour from the timber reconditioning process is
comprised of water vapour and a range of organic compounds (carbohydrates, acids)
that leach from the timber (Dare et al., 2003).
The condensate was sampled on 28/06/2018 and analysed for a range of physical and
chemical properties. These results and their comparison to industry averages are
summarised in Table 3.
Table 3 Sampling results of condensate effluent and comparision to industry averages from Dare et al. (2003)
Analyte Reconditioner condensate Dare et al. (2003) typical composition
pH 4.12 4.7 – 8.0
Chemical oxygen demand (COD) (mg/L)
2000 750 - 4700
Biochemical oxygen demand (BOD) (mg/L)
770 45 – 2160
Total suspended solids (TSS) (mg/L)
198 -
This effluent will be produced at a rate of approximately 10,000L per week. It is
proposed to transfer this effluent from the existing storage tanks via a swale drain to
the on-site stormwater pond. The stormwater pond is designed to retain site
stormwater runoff for onsite reuse (log stockpile watering).
As discussed in section 4.2 the existing pond storage will be increased to 1.9 ML by
enlarging the surface footprint. The pond will theoretically will receive 29.6 ML of
stormwater runoff per year based on the site area of 6.5 ha, average site runoff
coefficient of 0.74 and the mean rainfall of 614mm. This demonstrates that there will be
substantial dilution of the approximately 0.52 ML of condensate effluent produced per
annum with the stormwater collected. This will act to increase the pH of the retained
stormwater/effluent to close to neutral. In addition, the retention of the diluted effluent
will allow the settling of suspended solids and will promote aerobic biological
breakdown of the organic compounds. The pond is expected to operate predominantly
aerobically, due to its shallow nature and the expected regular wind action on the pond
surface, which will promote aeration and mixing of the surface water layer.
There is currently no reuse of stormwater from the pond. However it is proposed to
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reuse stormwater to maintain log moisture levels prior to milling, via spraying at the log
storage area. There is a potential that the surface of the log storage area will
experience organic enrichment from the stormwater reuse. However this is limited to
the log reuse area, and as log storage area drains to the stormwater pond, no enriched
stormwater will leave the site via this reuse mechanism.
Thus, even though the effluent stream will be improved via sediment and organics
removal in the stormwater pond, it will rarely leave the site, as it will be continually
reused on site.
4.6 Solid wastes
The current site operation produces mainly wood waste streams with a minor amount
of non-wood solid waste. Approximately 240 t (800 m3) per annum of sawdust is
produced, which is captured and stored in the collection and storage system. This is
taken off-site and beneficially reused as animal bedding. Approximately 1,250 m3 of
timber offcuts are produced per annum, which is gifted to employees for use as fuel for
domestic wood heating. 150 m3 per annum of non-wood solid wastes are produced at
the site, which includes waste plastic wrapping and strapping, and general refuse. This
is stored in a skip bin and periodically collected and disposed to landfill by a waste
contractor.
There will be a substantial increase in the volume of solid wood wastes produced at the
site due to an increase in the raw material to be processed. Solid wood wastes will
predominantly be in the form of hardwood sawdust and woodchips. Sawdust is
produced from the individual saws, while all waste timber and offcuts will be run
through the chipper to create woodchips.
At the maximum production capacity of 7,000 m3 processed timber, there is expected
to be approximately 7,000 m3 of woodchips and 3,500 m3 of sawdust produced per
annum. The volume of non-wood waste will increase in line with production to
approximately 230 m3 per annum. The composition of this waste will not change, and
will continue to be accumulated in a skip bin for collection and disposal by a waste
contractor.
The Sawmill Environmental Code of Practice recommends a waste management
strategy with a hierarchy of controls, as follows:
Waste minimisation;
Waste reuse and recycling;
Waste treatment to reduce hazard or nuisance;
Waste disposal.
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Porta will adhere to this strategy by prioritising waste minimisation through efficient and
well-planned operations, and ensuring waste products are beneficially reused where
practicable.
The management of sawdust is discussed in section 4.4.4. All sawdust produced will
be sold for beneficial reuse as horticultural supplies and animal bedding, thus
preventing its disposal in landfill.
A proportion of the woodchips produced will be reused as a fuel source for the biomass
boiler (approximately 450 t or 1,200 m3. Woodchips produced beyond the biomass fuel
requirement will be sold for beneficial reuse and/or sold to woodchip exporters, and
thus none will be disposed of in landfill.
The biomass boiler will produce ash as a combustion by-product. This will be
automatically transferred to a skip bin by screw conveyor. The annual production
quantity is expected to be 13.5 t. This will be disposed to landfill by a waste disposal
contractor.
4.7 Noise emissions
A noise assessment was undertaken by NVC (attached as Appendix 4) which included
undertaking noise measurements of the existing facility as well as proposed additional
equipment (currently still operating at Barber’s Sawmill in Launceston). The sound
pressure levels (SPLs) of this equipment with the proposed building layout was
modelled using iNoise software to predict noise emissions for the completed project.
Ambient noise levels at the nearest residential boundary were also measured.
This report includes details of all fixed and mobile noise sources from the current
operation and the proposed additional equipment. A summary of the noise-generating
equipment and their SPLs is provided in Table 4.
Table 4 Summary of noise generating equipment SPLs
Equipment SPL SWL (dBA)
Existing facility
Cut-off saw 104
Exhaust fan 104
Additional equipment
Twin circular saw 108
Twin band saw 116
Single circular saw 109
Multisaw edger 110
Chipper 119
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The proposed location of the noise-generating equipment, as well as surrounding noise
receivers relevant to the proposal are shown in Drawing A110 Noise Emissions Plan,
attached as part of Appendix 1.
From this modelling, noise emissions from the proposed operations were predicted at
the relevant receiver locations nominated for the project (Table 2 and Table 5).
Relevant noise emission limit criteria were obtained from the existing site EPN and the
EER guidelines provided by the EPA. These criteria are 57 dBA at the nearest
sensitive receiver (5 dBA above the measured ambient noise level of 52 dBA) and 65
dBA at surrounding industrial premises.
Outputs from the modelling are provided in the attached report and predicted noise
emission impacts at relevant receivers are summarised in Table 5.
Table 5 Summary of predicted noise emissions at relevant receptor locations and relevant criteria
Description Nearest sensitive receiver
West dwelling 1
West dwelling 2
Engineering workshop
Polyfoam Landscaping supplies
Predicted SPL (dBA) 50 58 56 53 65 57
Noise emission limits (dBA)
57 65 65 65 65 65
Exceeds limits? No No No No No No
This modelling demonstrates that the noise emissions from the completed project are
predicted to be below the noise emission limits at all relevant receiver locations, and
thus are compliant with the existing EPN and EER guidelines. In addition, the modelling
is conserved conservative for the following reasons:
Model assumes that all roller doors are open when they may be closed;
Model assumes that all equipment is operating concurrently, which is unlikely to occur;
Model assumes that there is no additional screening from the log stockpile, which is likely to be located between the sawmill shed and the residential area to the south;
Model assumes no internal screening within the shed. There is likely to be some screening from the proposed equipment layout.
A number of recommendations were proposed in the report, and form management
commitments of this proposal.
Commitment 9 – Ensure operation of milling equipment does not occur outside of the
hours allowed by the existing site EPN.
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Commitment 10 – Use material stockpiling (the long-term log storage yard) to afford
further screening to the residences where practicable.
Commitment 11 – Conduct a noise survey of the operations once the new site is
operating.
4.8 Transport impacts
Current site traffic movements are provided in Table 6. These consist of staff
passenger vehicle movements and truck movements for incoming and outgoing
product transport. There are additionally minor miscellaneous traffic movements.
Table 6 Traffic movements associated with current site operations
Traffic movements Frequency
Staff 15 vehicles per day
Incoming green sawn timber from saw mill
4 trucks per week
Outgoing product 4 trucks per week
Outgoing wood waste 1 truck per week
Service, miscellaneous deliveries
2 vehicles per week
Proposed site traffic movements for the expanded site operations are provided in Table
7. There will be a moderate increase in staff traffic movements, reflecting the increased
staffing at the site, and a moderate increase in truck movements for incoming and
outgoing product transport and wood waste reuse.
Table 7 Traffic movements associated with expanded site operations
Traffic movements Frequency Comments
Staff 25 vehicles per day
Incoming green sawn timber from saw mill
6 trucks per week Increase in product deliveries due to receipt of logs
Outgoing product 6 trucks per week Increase in product dispatch due to greater production
Outgoing wood waste 5 trucks per week Increase due to greater wood waste production
Service, miscellaneous deliveries
3 vehicles per week Marginal increase in non-product deliveries
No relevant existing traffic data exists for Cove Hill Rd. However, the site is located in
an industrial precinct that includes multiple manufacturers, transport depots and a
waste transfer station within 1 km of the proposal site. It is considered that the
moderate increase in traffic movements from this proposal is immaterial in relation to
the existing traffic generated by the surrounding industrial operations on Cove Hill Rd.
Thus the associated traffic movements will not adversely impact the amenity of the
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surrounding area.
4.9 Other off-site impacts
There are no other off-site impacts expected from the proposed site expansion.
4.10 Hazardous substances
There is currently no permanent fuel storage at the site, with the diesel forklifts being
refuelled from a 300 L fuel trailer, which is refuelled offsite approximately weekly. The
site redevelopment will include the installation of a 3000 L bunkered and self-bunded
diesel fuel storage container. This will comply with the requirements of AS 1940 The
storage and handling of flammable and combustible liquids. Fuel spill kits are
maintained at the designated forklift refuelling areas.
The site is connected to the natural gas pipeline, thus there is no requirement for gas
storage on site.
Lubricating oils and grease are required to maintain onsite equipment. The volumes
used are relatively minor and will be stored in an appropriately sized and bunded
hazardous goods cabinet to be installed in the new sawmill building. Oil spill kits will be
stored adjacent the hazardous goods cabinet.
In the event of a fuel or oil spill, the appropriate spill kit will be utilised to contain and
adsorb the spilled substance. The adsorbent material and any affected soil or wood
waste must be disposed of via licensed waste contractor.
Commitment 12 – Onsite diesel fuel storage will be limited to a 3000 L bunkered and
self-bunded fuel storage container, and spill kits will be available at the refuelling
location.
Commitment 13 – an appropriately sized and bunded hazardous goods cabinet will be
installed in the new sawmill building.
4.11 Site contamination (historical)
There is no known history of contamination at the site. The proposed expansion of site
operations will not generate any pollution that could contaminate soil and/or
groundwater at the site.
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4.12 Heritage
4.12.1 European heritage
A search was undertaken of the Tasmanian Heritage Register and the Tasmanian
Historic Places Inventory for the site and general vicinity. There are no sites registered
on or in proximity to the site. Consequently, there is expected to be no impacts on
European heritage associated with the development.
4.12.2 Aboriginal heritage
An Aboriginal Heritage Assessment Report was commissioned to assess potential
impacts of the proposed site expansion on Aboriginal heritage in the area. This was
requested by the EPA due to the proximity of the site to the Jordan River, which is an
area of Aboriginal cultural importance, with the area containing many known Aboriginal
sites.
The report consists of three stages:
a background assessment including consultation with Aboriginal Heritage
Tasmania (AHT), a search of registered Aboriginal sites in the vicinity of the
project area and a literature review of relevant ethno-historic information;
a field assessment which included walking transects across the project site
encompassing an area of 1.5 ha; and
an assessment of the archaeological sensitivity and presentation of
management recommendations, and summary of the above in a report.
The search of registered Aboriginal sites identified 92 registered Aboriginal sites
located within an approximate 2km radius of the study area, however none were
located within or in the immediate vicinity of the project site. The nearest registered site
is located approximately 500m north east of the project site.
The field survey was undertaken on foot, with the field team walking 1.4 km of
transects, encompassing an area of approximately 1.5 ha. Surface visibility was
estimated at 30% due to exotic vegetation cover over the majority of the surface area.
There were no Aboriginal heritage sites recorded during the field assessment, and no
stone resources suitable for stone artefact manufacturing were identified.
On the basis of the negative survey findings, the absence of registered Aboriginal sites,
the low potential for undetected Aboriginal sites to be present and the fact that the
entire site is disturbed from previous agricultural activities, the proposal was assessed
as being of very low archaeological sensitivity. The report thus advises that there are
no Aboriginal heritage constrains or legal implements to the project proceeding. It
recommends that an Unanticipated Discovery Plan (UDP) is kept on site during
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construction and personnel are made aware of their obligations under the Aboriginal
Heritage Act 1975 regarding unanticipated discoveries during construction activities.
Commitment 14 – An Unanticipated Discovery Plan will be implemented during the
project construction.
4.13 Sites of high public interest
There are no sites of high public interest in proximity to the proposal site.
4.14 Monitoring
It is proposed to undertake water quality sampling at the stormwater pond on a six
monthly basis, to enable the assessment of water quality compliance against the
expected compliance limits. Testing will measure pH, total suspended solids (TSS),
biological oxygen demand (BOD) and oil/grease. Drawing A111 Monitoring Locations
attached as Appendix 1 shows the location of this proposed monitoring location.
Commitment 15 – water quality sampling for pH, TSS, BOD and oil and grease will be
undertaken at the outlet of the stormwater pond every six months when flowing.
4.15 Rehabilitation
In the event of permanent closure of the site a Decommissioning and Rehabilitation
Plan will be developed and submitted to the EPA for approval.
The plan should include discussion and processes to:
Facilitate the orderly and safe removal of machinery and other equipment;
Establish sufficient vegetative ground cover to minimise dust and soil erosion;
and
Establish a monitoring regime to enable assessment of the effectiveness of the
plan.
Commitment 16 – A Decommissioning and Rehabilitation Plan will be developed and
submitted to the EPA for approval prior to the permanent closure of the site.
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5 Part D – management commitments
No. Commitment
1 The site will be kept tidy by removing and disposing of uncontrolled wood waste from the roadways, non-log storage areas and undeveloped areas.
2 The biomass boiler will be designed, including a baghouse fabric filter system if required, to ensure it complies with an in-stack concentration limit of 100mg/m3 for particulate matter.
3 A sawdust capture and storage system will be installed on all additional saw milling equipment. This system will be serviced and maintained as per manufacturer’s recommendations, to ensure system continues to operating effectively.
4 Internal access roads will be appropriately maintained to minimise dust generation.
5 Visual monitoring of dust generation will be conducted by staff. If it is determined, through visual monitoring or public complaints, that dust from access roads is an nuisance to neighbours, then roads will be swept or watered to mitigate dust generation
6 Internal site traffic will be speed limited to 10 km/hr.
7 The log yard will be maintained by regular removal of loose wood waste, such that fugitive dust emissions are kept to a minimum.
8 Dust suppression in the log yard will be assisted by the use of water irrigation spray.
9 Ensure operation of milling equipment does not occur outside of the hours allowed by the existing site EPN.
10 Use material stockpiling (the long-term log storage yard) to afford further screening to the residences where practicable.
11 Conduct a noise survey of the operations once the new site is operating.
12 Onsite fuel storage will be limited to a 3000 L bunkered and self-bunded fuel storage container, and spill kits will be available at the refuelling location.
13 An appropriately sized and bunded hazardous goods cabinet will be installed in the new sawmill building.
14 An Unanticipated Discovery Plan will be implemented during the project construction.
15 Water quality sampling for pH, TSS, BOD and oil and grease will be undertaken at the outlet of the stormwater pond every six months when flowing.
16 A Decommissioning and Rehabilitation Plan will be developed and submitted to the EPA for approval prior to the permanent closure of the site.
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6 Part E – Public and stakeholder consultation
Consultation has occurred with Brighton Council regarding the proposal. This has
included a site visit by planning staff and numerous correspondence regarding planning
aspects of the proposal.
Given the fact that the proposal site operates an existing industrial use at the site, and
is surrounded by industrial activities no public consultation was deemed necessary.
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7 References
Dare, P. and Riley, S. 2003. Liquid condensate emissions from kilns drying radiate
pine. Proceedings 8th IUFRO International Wood Drying Conference 2003.
Forsyth, S.M. (compiler) 2002. Digital Geological Atlas 1:25 000 Scale Series. Sheet
5226. Richmond. Mineral Resources Tasmania.
Strata Geoscience and Environmental. 2018. Geotechnical Investigation 112 Cove Hill
Road Bridgewater.
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Appendices
Appendix 1 - Site drawings:
A101A Location Plan A
A102 Site Plan
A103 Water Supply Plan
A104 Stormwater Detention Dam Upgrade
A105 Heavy Vehicle Access plan
A106 Crossover Detail
A107 typical Driveway detail
A108 Signage Details
A109 Air Emissions Plan
A110 Noise Emissions Plan
A111 Monitoring Locations Plan
Appendix 2 - Planning Application – Supporting Submission
Appendix 3 - Natural Values Report
Appendix 4 - Noise Assessment