Supplementary Information DWER - Works & Licensing ... · Supplementary Information DWER - Works & Licensing Application & City of Gosnells Development Application Asphalt Manufacturing

Supplementary Information

DWER - Works & Licensing Application

&

City of Gosnells Development Application

Asphalt Manufacturing Plant

City of Gosnells

Location

6 Allott Way, Maddington, City of Gosnells

(Part of Provisional Lot 521, Previously Part of Lot 9005)

Prepared for

Perth Asphalt Supply Pty Ltd

July 2017

Holmes Environmental Pty Ltd ACN 143 154 456

In trust for The RM & KL Environmental Trust ABN 20 688 071053

18 Pindari Road, Lesmurdie WA 6076

Phone 08 9291 9284 Mob 0428 244 822

[email protected]

mailto:[email protected]

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This document formatted for double page printing

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1.0 APPLICATION DETAILS .................................................................................................. 1

1.1 General Company Description ............................................................................................ 1

1.2 The proposal ........................................................................................................................... 1

1.3 DWER Licence Categories Requested ............................................................................... 1

1.4 Development Application ..................................................................................................... 1

1.5 Site Development ................................................................................................................... 1

1.6 Occupier and Proponent Details ......................................................................................... 2

2.0 LOCATION ............................................................................................................................. 3

2.1 Site Ownership ....................................................................................................................... 3

2.2 Current Land Use ................................................................................................................... 3

2.3 Premises Detail ....................................................................................................................... 3

3.0 DECISION MAKING AUTHORITIES ............................................................................. 5

3.1 Department of Water & Environmental Regulation (DWER) ........................................... 5

3.2 Environmental Protection Authority (EPA) ....................................................................... 5

3.3 Department of Health (DoH) ................................................................................................. 5

3.4 Landowner Approval ............................................................................................................. 5

3.5 Local Government Authority ................................................................................................ 6

3.5.1 City of Gosnells- Town Planning Scheme No.6 (GTPS No.6) - Zoning .............................................. 6

3.5.2 Supporting Infrastructure ...................................................................................................................... 7

3.5.3 Personnel ............................................................................................................................................... 7

3.6 Department of Mines, Industry Regulation and Safety ................................................... 7

3.7 Other Regulatory Authorities ............................................................................................... 8

3.8 Relevant Standards ............................................................................................................... 8

4.0 THE EXISTING ENVIRONMENT .................................................................................. 10

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4.1 Sensitive Receptors ............................................................................................................. 10

4.2 Contamination ...................................................................................................................... 10

4.3 Compliance - Contaminated Sites Act ............................................................................. 10

4.3.1 Previous Investigations & Approvals .................................................................................................. 10

4.3.2 Development Plan ............................................................................................................................... 10

5.0 THE ASPHALT MANUFACTURING PLANT ........................................................... 12

5.1 Summary................................................................................................................................ 12

5.2 Asphalt Plant Operation ...................................................................................................... 12

5.3 Bag House ............................................................................................................................. 13

5.4 Diesel Fuel ............................................................................................................................. 13

5.5 Bitumen .................................................................................................................................. 14

6.0 ENVIRONMENTAL MANAGEMENT ........................................................................... 16

6.1 Introduction ........................................................................................................................... 16

6.2 Fugitive Odour Emissions – Hotmix Asphalt .................................................................. 16

6.2.1 Source of Emissions ............................................................................................................................. 16

6.2.2 Odour Emission Control ...................................................................................................................... 16

6.2.3 Mitigation ............................................................................................................................................ 16

6.2.4 Summary ............................................................................................................................................. 17

6.3 Point Source Emissions ..................................................................................................... 17


6.3.2 Atmospheric Emission Control ............................................................................................................ 17

6.3.3 Mitigation ............................................................................................................................................ 17

6.3.4 Summary ............................................................................................................................................. 18

6.4 Gaseous Emissions ............................................................................................................. 18


6.4.2 Mitigation ............................................................................................................................................ 18

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6.5 Dust Emissions – Materials Handling .............................................................................. 18


6.5.2 Mitigation ............................................................................................................................................ 19

6.6 Noise Emissions .................................................................................................................. 19


6.6.2 Mitigation ............................................................................................................................................ 19

6.7 Diesel/Bitumen Storage ...................................................................................................... 19


6.7.2 Mitigation - Diesel ............................................................................................................................... 19

6.7.3 Mitigation - Bitumen and Lubricating Oils .......................................................................................... 20

6.8 Water Discharge ................................................................................................................... 20


6.8.2 Mitigation ............................................................................................................................................ 20

6.9 Solid/Liquid Wastes ............................................................................................................. 20


6.9.2 Mitigation ............................................................................................................................................ 20

6.10 Discharges to Land and Water .......................................................................................... 21

6.10.1 Source of Emissions ........................................................................................................................ 21

6.11 Stormwater Contamination ................................................................................................ 21

6.11.1 Source of Emissions ........................................................................................................................ 21

6.11.2 Mitigation ....................................................................................................................................... 21

6.12 Stormwater Management .................................................................................................... 21

7.0 LIMITATIONS ...................................................................................................................... 23

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Figures

Figure 2.1 6 Allott Way, Maddington. ....................................................................................... 4

Figure 3.1 City of Gosnells TPS 6 Zoning Map .. ......................................................................... 9

Figure 4.1 Distance to nearest sensitive receptor. ................................................................... 11

Figure 5.1 Oblique view of an installed plant.. ........................................................................ 15

Figure 6.1 Wind Rose for City of Gosnells.. .............................................................................. 22

Tables

Table 1.1 Occupier and Proponent Details ............................................................................... 2

Table 2.1 Premises corner boundary geospacial locations as shown in Figure 3......................... 3

Table 5.1. Mobile Asphalt Plant data ...................................................................................... 14

DWER Attachments

Application Form Reference

Attachment

Attachment 1A Lease Agreement and Landowner Correspondence

Certificate of Title Lot 9005

Attachment 1B ASIC Company Extract

Attachment 2 Aerial Photograph + Discharge Point

Infrastructure: Allott Way Site Plan

Sensitive Receptors: Attached document Figure 3.1

Attachment 3A See Attached Document Section 1

Attachment 6A See Attached Document Section 6.3.3.

Attachment 7 Aerial photo with distances

Attachment 8 Enpoint "Site Management Plan"

Letter - DWER Contaminated Sites Branch

Attachment 9 Fee component Works Approval

Attachment 10 Works Approval and Licence Fee calculation.

1 Application Details

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1.0 App lication Det ails

1.1 General Company Description

Perth Asphalt Supply Pty Ltd is a Western Australian company with interests in both civil and private

asphalt and concrete applications.

Asphalt surfacing and repair - civil, business and private.

Concreting - construction and maintenance - civil, business; and private.

Drainage solutions.

Plant hire.

Traffic control and management.

The proponent's clients include four major metropolitan city councils and major WA prime

contractors. A copy of the proponent's ASIC Company Extract is provided as an attachment.

1.2 The proposal

The proposal is to locate and operate a small 40 tonne per hour asphalt manufacturing plant within

leased premises at 6 Allott Way, Maddington.

The proponent currently occupies premises at 206 Maddington Road, Maddington. Due to an

increase in client demand the proponent has recently leased larger premises in Allott Way to allow for

business expansion and the opportunity to manufacture asphalt for the company's expanding

asphalting contracts.

1.3 DWER Licence Categories Requested

The mobile asphalt plant has an average capacity of about 40 tonnes per hour – depending on the

grade of aggregate employed equating to not more than 50,000 tonnes per annum - including down

time for repairs and periodic servicing and delivery limitations.

Category of works approval/licence sought

Category 35 Asphalt manufacturing: premises on which hot or cold mix asphalt is produced using

crushed or ground rock aggregates mixed with bituminous or asphaltic materials for

use at places or premises other than those premises

1.4 Development Application

See Section 3.5 below for information required by the local government authority. Drawings and

photographs required for the assessment are attached separately.

1.5 Site Development

The proposed manufacturing plant is a fixed-location plant. It will arrive on site in pre-assembled

units that are located and secured on pre-prepared concrete footings - see Table 5.1 below for details.

Support infrastructure will include 3-sided ground bins for aggregate stockpiles demountable offices

with sewer, water and electricity mains connections and hard-standing for work areas, traffic and

1 Application Details

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parking. Ground disturbance will be limited to footings, sewer and water mains connections.

Stormwater management and drainage will be installed by the landowner.

1.6 Occupier and Proponent Details

All relevant proponent information for both Department of Environment Protection and City of

Gosnells assessment is provided in Table 1.1 below

Table 1.1 Occupier and Proponent Details

Premises Description Part of Provisional Lot 521, Previously Part of Lot 9005 on Deposited Plan 40777, Volume 2560 Folio 13

Premises Street Address 6 Allott Way, Maddington.

Premises Owner Hughes Enterprises Australia Pty Ltd (ACN

600969275)

Address 45 Bygum Lane, Martin WA 6110

Proponent and Occupier Perth Asphalt Supply Pty Ltd

Registered Company Address 5 Marion Street, Midland WA 6056

Telephone 08 9261 1800

ABN 33 618 055 477

ARBN 0126126J

ACN 618 055 477

ANZSIC Code 1709 ‘Asphalt Mixing’

Director Matthew McDowell

Mobile 0488 775 388

Telephone 9452 8040 or 9452 08643

Fax 9238 4975

Email [email protected]

Street Address 206 Maddington Road, Maddington WA 6109

Postal Address PO Box 2416, High Wycombe WA 6057

2 Location

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2.0 Locat ion

2.1 Site Ownership

6 Allott Way is owned by Hughes Enterprises Australia Pty Ltd. A copy of the Certificates of Title is

provided as an attachment.

2.2 Current Land Use

6 Allott Way is in the process of subdivision of the existing Lot 9005 into three Provisional Lots 521,

522 and 523. The proponent intends to lease a portion of Provisional Lot 521 as shown in Figure 2.1

below. Provisional Lot 521 is a "brown-fields" development being part of the larger industrial area

that was previously used for landfill.

2.3 Premises Detail

The proposed premises boundaries are shown in Figure 2.1; corner geospatial locations are provided

in Table 2.1 below.

Table 2.1. Premises corner boundary geospacial locations as

shown in Figure 3 - rotating clockwise from northern-

most corner boundary

Corner Boundary Northing Easting

1. North 6 455 162.855 405 881.159

2. North East 6 455 132.949 405 964.026

3. 6 455 041.158 405 924.346

4. East 6 455 011.288 405 964.443

5.South 6 455 943.613 405 898.242

6.West 6 455 038.302 405 801.460

7. 6 455 078.301 405 840.595

2 Location

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Figure 2.1 6 Allott Way Maddington. Blue lines = boundary 6 Allott Way (Lot 9005); Red lines = Leased area of proposed premises being part of Provisional Lot 521 (from Landgate)

See Site Plan, Attachment E.

3 Decision Making Authorities

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3.0 Decision M aking Authorities

3.1 Department of Water & Environmental Regulation (DWER)

Under the Environmental Protection Regulations 1987, Asphalt Manufacturing is a prescribed

activity and as such any new operations require Works Approval and Licensing, subject to assessment

by the DER.

This document provides the information required for assessment by DWER for both works approval

and licensing. In regard to buffer distances between certain prescribed and sensitive premises (see

Section 3.2 below), the then DER stated that applications will in future be assessed on a case-by-case

basis (Letter - Agnes Tay, DER. 17jan17).

Lot 9005 (6 Allott Way) Certificate of Title includes a memorial recorded under the Contaminated

Sites Act 2003 registered 1/9/2016. Matters relating to compliance with the Contaminated Sites Act

and DWER Contaminated Sites Guidelines, as of interest to DER, DoH and City of Gosnells, are

provided in Section 4 below.

3.2 Environmental Protection Authority (EPA)

Appendix 1 of the EPA Guidance Statement No.3 Separation Distances between Industrial and

Sensitive Land Uses provides the following guidance regarding “asphalt works”.

Impacts include: noise dust and odour;

Key Government agency for advice or approval: Local Government;

Buffer Distance: 1000 metres.

In regard to the above items:

Mitigation of impacts is discussed in Section 6

The Key Government Agency for advice and approval is the City of Gosnells. Referral to

OEPA is not required.

Buffer distance will be assessed by the DWER on a case-by-case basis (see Section 3.1

above).

3.3 Department of Health (DoH)

Because 6 Allott Way has been registered under the Contaminated Sites Act 2003, proposed

development of the site may require referral to DoH by the City of Gosnells and/or DER.

3.4 Landowner Approval

Part of Provisional Lot 521 leased by the proponent is owned by Hughes Enterprises Australia Pty

Ltd. A copy of the lease agreement between the proponent and the landowner is is provided as an

attachment; also provided is a letter from the landowner stating no objection to Category 35

operations within the leased area.


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3.5 Local Government Authority

The local government authority for this proposal is City of Gosnells. This proposal is concurrently

submitted to DWER (Works Approval and Licensing Approval) and City of Gosnells (Development

Approval).

This document provides information to assist the City of Gosnells to assess the proposal for

planning/development approval. A copy of the Development Application Form, signed by the

applicant and the owner of the property is provided as an attachment.

Definitions as provided by the City of Gosnells TPS 6 Scheme Text for the Zones indicated in Figure

3.1 below:

General Industrial - To provide for manufacturing industry, the storage and distribution of

goods and associated uses, which by the nature of their operations should be separated from

residential areas.

Business Development - To provide for the progressive and planned development of areas for

commercial and industrial uses.

Residential/Light industry - To provide for composite residential/light industrial development

to meet the needs of businesses which require a residential component and provide a suitable

interface between industrial zoned land and residential zoned land.

Residential - To provide for residential development at a range of densities with a variety of

housing to meet the needs of different household types.

Residential Development - To provide for the progressive and planned development of future

urban areas for residential purposes and for commercial and other uses normally associated

with residential development.

General Rural - To provide for a range of rural pursuits which are compatible with the

capability of the land and retain the rural character and amenity of the locality.

3.5.1 City of Gosnells- Town Planning Scheme No.6 (GTPS No.6) - Zoning

6 Allott Way is located within the General Industry Zone (see Figure 3.1 below) that has the

following objective:

"To provide for manufacturing industry, the storage and distribution of goods and associated uses,

which by the nature of their operations should be separated from residential areas."

The proposal before City of Gosnells is for the operation of an Asphalt Manufacturing Plant that will

require works approval and licensing under the Environmental Protection Regulations (1987) - and as

such is defined under the GTPS No.6 as "industry - noxious", as defined under GTPS 6 Scheme Text:

"means an industry which is subject to licensing as “Prescribed Premises” under the Environmental

Protection Act 1986 (as amended)"


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Under The GTPS No.6 Zoning Table "Industry - noxious" is catagorised "A" which has the following

definition:

"means that the use is not permitted unless the local government has exercised its discretion by

granting planning approval after giving special notice in accordance with clause 64 of the Planning

and Development (Local Planning Scheme) Regulations 2015 Schedule 2"

Therefore the proponent requests that the Gosnells City Council consider development approval for

this application taking into account that the application is submitted concurrently to DWER and will

be subject to assessment under both Part V of the Environmental Protection Act 1986 and

Contaminated Sites Act 2003 taking into consideration technical and environmental information

provided elsewhere in this document.

3.5.2 Supporting Infrastructure

The asphalt plant will require diesel-electric motive power, diesel fuel for aggregate heating and

drying, and maintaining the temperature of stored liquid bitumen. Five grades of crushed granite

aggregate will be stockpiled in three-sided bins. The proposed layout is provided in Figure 4.1 below

showing the location of all infrastructure, hardstands and traffic circulation.

Administrative and staff support facilities will be required including offices, mess room, kitchen and

toilets within a demountable building as shown in Figure 4.2 below.. All services including

electricity, water and sewage will be connected to offsite reticulated facilities.

Earthworks and drainage for stormwater management and runoff will be provided by the landowner

(see attached drawings).

3.5.3 Personnel

Fourteen people will be employed on site including four for asphalt production, five subcontractors

for raw material and product transport with the remainder being support staff.

3.6 Department of Mines, Industry Regulation and Safety

The proponent intends to maintain diesel fuel storage on site no more than 5,000 litres. Diesel fuel

will be stored within a bunded compound as required by DWER guidelines - sufficient to contain

110% of the volume of the largest container or tank within the compound.

Dangerous Goods Safety Guidance Note S01/09. Manifest quantity for diesel fuel is 100,000 litres.

The requirement is that a site must be licensed under Dangerous Goods requirements if DG are stored

in exceedance of the manifest quantity. The anticipated diesel fuel storage will not exceed 5,000

litres.


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3.7 Other Regulatory Authorities

The on-site operations will also be regulated by the following:

Environmental Protection (Unauthorised Discharges) Regulations 1987

Environmental Protection (Noise) Regulation 1997

Dangerous Goods Safety (Storage and Handling) Regulations 2007

Occupational Safety and Health Act 1984

Occupational Safety and Health Regulations 1996

Environmental Protection (NEPM-NPI) Regulations 1998;

National Greenhouse and Energy Reporting Act 2007;

Local Government Act 1995;

Contaminated Sites Act 2003; and

Contaminated Sites Regulations 2006.

3.8 Relevant Standards

AS 1940-2004 The Storage and Handling of Flammable and Combustible Liquids.


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Figure 3.1. City of Gosnells TPS 6 Zoning Map. An approximate 1,000 metre radius about the proposed premises is indicated. See Section 3.5 for zoning definitions.

4 The Existing Environment

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4.0 The Existing Environment

4.1 Sensitive Receptors

The nearest sensitive receptors are indicated in Figure 3.1 above and Figure 4.1 below. Bickley

Creek, indicated in both figures is located to the south of the proposed premises..

4.2 Contamination

The Certificate of Title includes a memorial recorded under the Contaminated Sites Act 2003

registered 1/9/2016.

4.3 Compliance - Contaminated Sites Act

4.3.1 Previous Investigations & Approvals

Enpoint Environmental Asset Management was engaged by the landowner of Lot 9005, Allott Way

Maddington to prepare a Site Management Plan for Lot 9005 (attached).

As per the SMP document

Enpoint has been engaged by the Hughes Family Trust (HFT) to prepare a Site Management Plan

(SMP) to facilitate the clearance of Environmental Condition number 9 contained within the

Western Australian Planning Commission (WAPC) conditional approval to subdivide Lot 9005

Allott Way, Maddington. This SMP applies to provisional Lots 521, 522 and 523, which

collectively comprise an area of approximately 3.1 hectares.

Subsequently, DWER received a Mandatory Auditor's Report in respect of the submitted SMP. In

response, a letter was forwarded by Contaminated Sites Branch (attached) confirming as follows:

Based on the information provided, DER and DoH concur with the Auditor's conclusions that

investigations for soil, soil gas, and groundwater contamination at the site were carried out in

general accordance with the DER's Contaminated Sites Guidelines.

and

Proposed building designs should be endorsed by an accredited DER Auditor and subsequently

approved by the DER and DoH, prior to development and construction on the site. Subsequently,

DER considers that Condition 9 of WAPC Subdivision Approval No. 152284 has been

satisfactorily met for Lot 9005 Allot Way, Maddington.

4.3.2 Development Plan

As per Section 1.5 above, the proponent has prepared drawings for the Site Development Plan

(attached) that comply with the recommendations of the Enpoint Site Management Plan. Ground

disturbance will be limited to footings required for the asphalt manufacturing plant and sewer and

water mains connections. Footings for the asphalt plant will be to a maximum depth of 700 mm (Page

3c - Development Plans). Trenching and footing works will not be left open for more than two days

as per Enpoint recommendations. The landowner has committed to ground water issued as per

Enpoint's recommendations outlined in the Site Management Plan.

4 The Existing Environment

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Table 4.1 Distance to nearest sensitive receptor. Distance to Bickly Creek is approximately 330 metres (from Google Maps).

5 The Asphalt Manufacturing Plant

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5.0 The Asphalt M anufacturing Plant

5.1 Summary

Manufacturing infrastructure includes:

cold aggregate feeder bins that are topped up by loader from the ground bins

rotating heater/dryer drum

pug-mill for mixing heated aggregate and liquid bitumen

gob-hopper for loading trucks.

Integrated infrastructure includes:

bag house

diesel-heated 30,000 litre mobile bitumen tanker

Support infrastructure includes

front-end loader

aggregate stock piles in 3-sided aggregate ground bins

5,000 litre on-site bunded fuel tank.

diesel generator

An oblique view of the layout of a similar plant is provided in Figure 5.1 and tabulated information is

provided in Table 5.1 below.

Raw materials and fuels required for energy will include

Five grades of aggregate

Bitumen

Diesel fuel.

No fillers other than recovered bag house dust (see Section 5.3 below), will be included in the

manufacturing process.

5.2 Asphalt Plant Operation

Table 5.1 below provides a tabulated summary of data provided by the manufacturer.

Aggregates are transferred by loader from the stock-pile ground bins to the cold-aggregate feeder

bins, each bin for a given aggregate size. Under computer control, aggregate is loaded from the cold

aggregate bins onto a slinger conveyor in precise quantities for loading into the dryer/heating barrel.

While the drum rotates to ensure even heating, a diesel-fired burner within the barrel heats the

aggregate to a set temperature. Dust generated during aggregate rotation within the drum is drawn

into the baghouse by a powerful induction fan with cleansed air discharged via the vertical stack. The

baghouse includes a return auger which returns filtered dust back to the drum for recycling into

product.

The asphalt production operation is controlled by a computer-control panel that is housed in a sound-

proof, air-conditioned control cabin. Proportioning of the output from the feeder bins is controlled by


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this computer with outputs of between 25 and 50 tonnes per hour being selected, depending on the

grade of aggregate used.

When aggregate rotating within the dryer/heater drum reaches the required temperature, the hot

aggregate is dumped to a pug-mill which is then closed before the exact volume of liquid bitumen is

injected. The pug-mill is rotated for approximately one minute to deliver hotmix asphalt. The fresh

hotmix asphalt is then dumped via the discharge chute to the enclosed, inclined hotmix conveyor to

the gob-hopper where it may wait or be immediately delivered into a waiting truck.

5.3 Bag House

The baghouse consists of a two levels system where course particles in the air stream are removed via

a gravity collector and fine particles collected in air-filtration bags. Accumulated dust in the filtration

bags are removed via and air pulsing system. Filtered air is then discharged via a vertical stack on the

bag house.

Filter bags are of American heat-resistant Nomex material with a maximum instantaneous temperature

of 235℃. Elastic clamps secure bags to the bag frame to facilitate fast and secure installation and

replacement. Access to the bag house for periodic inspection and bag replacement is via the bag

house top cover. The upper level of the baghouse normally operates below atmospheric pressure

where bag cleaning is achieved via a pulsing system that is a reverse flow of normal atmospheric

pressure into the upper chamber.

Dust collection bags are periodically pulsed to shake loose collected dust. A screw auger returns both

gravity and pulsed dust to the filler elevator where dust is re-incorporated into the manufacturing

process.

Aggregate heating and baghouse filtration is an integrated system designed to operate between 80 and

180°C. The integrity of the bag house is insured via air temperature monitoring at the induction fan.

A short-term limit of 220°C is allowed with an over-temperature cut-out at 230°C. Also, an alarm is

set to alert the operator in the event that temperature drops to 80°C. The over-temperature stop device

consisting of a cold-fan valve on the inlet of the baghouse ensuring that temperatures within the

baghouse do not exceed the short-term temperature limit - in the event that temperature exceeds the

cut-out value, the control system will cut off fuel to the burner in the dryer/heater drum.

The temperature control system not only protects the integrity of the baghouse, but also ensures that

product quality is maintained by ensuring the drum temperature remains within defined limits - this

also prevents blue-smoke emissions arising from over-temperature exceedances. In an older

generation of plants, blue-smoke emissions arising from over heating were a major cause of odour

emissions.

5.4 Diesel Fuel

Diesel fuel will be stored on site in a 5,000 litre tank bunded to accommodate 110% of the volume of

the storage tank (5,500 litres).


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5.5 Bitumen

Bitumen will be stored on-site in a mobile 40,000 litre heated/stirred container. The temperature of

the stored bitumen will be maintained using an on-site generator.

Table 5.1. Mobile Asphalt Plant data

Integrated Asphalt Manufacturing Plant Tietuo Machinery QLB-40

Average Capacity of Machinery 40 tonnes per hour.

Stack height 4.2 m

Plant Motive Power Diesel Generator

Heater/Dryer Drum Burner Diesel Fuel

Bitumen Tank Temperature Electric, via Diesel Genset.

Cold Aggregate Bins 5

Bitumen Storage and Heating Tank 30,000 litres

Installed Diesel Storage 5,000 litres

Water for dust control & safety 2,000 L

Installed Genset 265 KVa

Asphalt maximum daily production 300 tonnes

Estimated Annual Production if fully utilised < 50,000 tonnes

Baghouse

Dust Collection Area 160 m2

Operating Temperature 80°C to 180°C

Maximum Temperature 230°C

Dust Collection 266 Nomex Bags

Dust Collection Efficiency Better than 99%


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Figure 5.1. Oblique view of an installed plant (from Fujian Tietuo Machinery - but not in the configuration as per the proposal)

6 Environmental Management

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6.0 Environment al M anagement

6.1 Introduction

The proposed operation presents very low, if not negligible environmental risk or amenity issues for

nearest sensitive premises. Furthermore, the operation does not result in the discharge of liquid or

solid wastes that could be of adverse impact to either groundwater or to Bickley Creek located to the

south of the proposed premises.

Potential impacts identified in the EPA Guidance Statement No.3 are noise, dust and odour. These

emissions can be further identified:

Emissions from the aggregate heater/dryer drum.

Potential odour emissions from hot-mix asphalt

Dust from aggregate handling and movement.

Noise from generators, front-end-loader aggregate movement.

Potential spillages include hot bitumen, diesel fuel and lubricating oil.

6.2 Fugitive Odour Emissions – Hotmix Asphalt

6.2.1 Source of Emissions

Hotmix asphalt has a characteristic odour that is present when hotmix asphalt during manufacture, or

is either being loaded or transported or applied to roadway or other surfaces.

6.2.2 Odour Emission Control

Aggregate/bitumen mixing takes place within an enclosed pug-mill. Digital monitoring of the drum

temperature ensures aggregate heating does not exceed a defined temperature limit - thus maximising

fuel efficiency and ensuring controlled temperature for aggregate/bitumen mixing - also eliminating

the generation of fugitive blue-smoke emission. When mixing is completed hotmix asphalt is briefly

exposed to the atmosphere when dumped to the gob-hopper via an enclosed conveyor and later when

dumped to a waiting truck. The load is covered as soon as truck loading is completed so as to

minimise temperature loss which also minimises fugitive odour emission.

6.2.3 Mitigation

Aggregate heating and liquid bitumen temperature is maintained in the optimum temperature

bandwidth for the hotmix product that avoids fuel wastage, quality degradation and odour

emission. The manufacturing process is digitally controlled and is monitored in the operators

cabin by the operator. Odours arising from a previous generation of older asphalt plants were

related principally to blue-smoke emissions caused by overheating the bitumen/aggregate mix

within the heating/drying drum. The proposed operation employs pug mill mixing rather than

bitumen injection to the heating/drying drum.

Departing vehicles carrying hotmix asphalt are required to cover their loads to ensure

optimum temperature is maintained. This requirement also minimises fugitive odour

emissions from moving vehicles.


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Potential residential areas and current residentially occupied areas are of sufficient distance

for potential fugitive odour emissions to be of no concern. The location of the

"Residential/Light Industry" zoning to the south of the proposed premises is located at a

distance of about 400 metres (Figure 3.1 above) - however, the status of permanent residence

in the nearest houses is uncertain as the zoning allows mixed industry/residential that does not

at present appear include residential premises. The distance to the nearest currently occupied

residence is 660 metres as shown in Figure 4.1. Furthermore, average seasonal winds (Figure

6.1) are predominantly from the southwest and south - placing nearest sensitive premises

mostly upwind of the proposed operation.

The nearest Bureau of Meteorology weather station to the proposed premises is located at the

City of Gosnells. The average five-year wind rose for Gosnells is shown in Figure 6.1 below.

Comparing Figure 6.1 and Figure 3.1 (Zoning Map) indicates average seasonal winds are

predominantly from the southwest and south - placing nearest potentially sensitive premises

at most upwind of the proposed operation.

6.2.4 Summary

Odour emissions are highly unlikely to impact the amenity of the nearest residential zoned areas due

to:

Employment of modern computer controlled manufacturing process that strictly controls

drum heating temperatures.

Fugitive odour emissions may arise briefly from hot mix asphalt production via gob hopper

and truck loading operation.

Departing vehicles are required to cover hotmix loads that will minimise odour emission.

Sufficient distance to the nearest "Residential" zoned area.

Nearest residential-zoned areas are on average, infrequently downwind of predominant wind

directions.

6.3 Point Source Emissions


The drying/heating of aggregate within a rotating drum may result in atmospheric particulate

emissions. Heating energy is supplied by diesel fuel to the drum burner - resulting in potential

gaseous emission.

6.3.2 Atmospheric Emission Control

Air from the aggregate drying and heating process is forced through the baghouse by a high velocity

inductions fan before being discharged via the vertical stack on the baghouse.

6.3.3 Mitigation

Stack testing on the same model plant indicates that point-source particulate emissions to be

substantially below DWER guideline emission value.


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Stack tests previously conducted on the same model plant in Western Australia -dated

29/3/2016 gave the following emissions data (g/min, STP dry):

o Particulates: 25.0

o NO2: 9.0

o SO2: 11.0

o CO: 12.0

Predominant wind directions in relation to the various zoned areas is presented in Section

6.2.3 above.

Operators carry out first-echelon maintenance of the plant including the baghouse on a

scheduled basis. The baghouse also receives an annual service where all bags are checked

and replaced as required. Spare bags are kept in stock for replacement when required.

Operators will be required to immediately report to management an increase in the visible tail

discharge from the stack. In the event of a suspected bag leak - coloured die may be added

the baghouse induction port. Any leakages will be evident once the baghouse has been

opened for inspection.

6.3.4 Summary

Particulate emissions are unlikely to impact the local environment because:

Efficient filtering of particulates arising from drying/heating process

Regular maintenance and bag replacement will be conducted to ensure compliance with

DWER emission requirements.

Any visible increase stack tail emissions will be followed up by an inspection and

replacement of bags as required.

Periodic stack testing will be conducted to verify compliance with DWER licence conditions.

6.4 Gaseous Emissions


During the heating and mixing process, various gases are released to the atmosphere as per Section

6.3.3 above. These arise from the combustion of fuel and the balance of fuel oxygen mix at the

burner.

6.4.2 Mitigation

Annual stack-testing will be conducted to verify compliance with DWER gaseous and

particulate emission limitations.

6.5 Dust Emissions – Materials Handling


A front-end loader will be used to top up cold aggregate bins from stock piles. Dust may be generated

during loading operations under windy conditions.

Dust may be generated by the movement of the loader and trucks.


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6.5.2 Mitigation

Mitigation factors include:

Stockpiles will be maintained within 3-sided bins that are not loaded beyond the height of bin

walls.

All materials movement will be conducted on a hardstand to facilitate good housekeeping

practices.

Any aggregate and dust spills to the hardstand will be removed on a daily basis.

During dry and windy conditions, stock piles and operating/trafficed areas will be kept damp

using misting sprays.

6.6 Noise Emissions


Noise will be generated by several sources including

Aggregate movement and loading operations

Generator operations

Vehicle movement.

6.6.2 Mitigation

Asphalt plants are not inherently noisy operations. The dominant noise source from the

asphalt plant itself is due to rotation of aggregate in the heating drum – together with other

noise emissions from vehicles and generator operation, noise emissions would be

substantially below the statutory noise limitation at the premises boundary.

The proposed premises is bounded by tall tilt-up panel concrete buildings on the south and

west of the site. These buildings will severely attenuate any noise emissions to the south and

west.

The distance to the nearest sensitive premises is at a sufficient distance to mitigate any

potential noise emissions.

Perth Asphalt Supply is aware of the requirements of the Environmental Protection Noise

Regulations, 1997 and will ensure that the Regulations are observed.

6.7 Diesel/Bitumen Storage


Potential hydrocarbon spills may occur during refilling and refuelling operations - these are most

likely to be either drip or at most small volumes less than a few litres.

6.7.2 Mitigation - Diesel

All operations will be conducted on a hard stand that will prevent loss of hydrocarbons to the

underlying soil and facilitate any potential spill cleanups.

A spill-kit bin will be kept on site for cleanup in the event of a minor spill.


Page | 20

Diesel fuel will be stored according to DWER bunding requirements. Diesel fuel will be

stored within a bunded compound that is capable of containing 110% of the largest container

within the bund.

The fuel supply to the diesel burner is controlled by pump at the burner. Consequently, fuel is

drawn under negative pressure. Any potential leakage in the supply line would result in air

entering the fuel line and fuel running back to the tanker.

Any minor spills and drips during refuelling will be recovered by containing the spill with

sand and returning this to the manufacturing process.

6.7.3 Mitigation - Bitumen and Lubricating Oils

Any bitumen that might be spilled during topping up of the bitumen tank will set rapidly to a solid

state as it cools. This will be retrieved and recycled into the operation. Bitumen does not present an

environmental risk. Roads in WA are surfaced with the same product that will be produced by the

proposed operation.

It is likely that the diesel generator and other plant will require servicing while located within the

proposed premises. Such plant will operate and be surfaced on a hardstand. Any potential spills are

likely be very minor and easily recovered. All waste lubricating oil will be stored for recycling as per

City of Gosnells recommendations and requirements.

6.8 Water Discharge


Misting water sprays will be used for controlling:

dust emissions

aggregate stockpiles

operational/trafficked hardstands

It is possible that excessive use of water will result in a discharge from the premises.

6.8.2 Mitigation

Mitigation factors include:

Saturation of stockpiles is to be avoided as drying will require additional heating.

Water sprays on stockpiles and hardstand will not be to the point of run-off.

6.9 Solid/Liquid Wastes


Wastes will not be generated by asphalt operations apart from waste lubrication oils from servicing

plant and equipment.

6.9.2 Mitigation

In the event, waste lubrication oils are collected for recycling.


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6.10 Discharges to Land and Water


The asphalt operation will not discharge any wastes or substances to land or water.

6.11 Stormwater Contamination


The only possible contamination of stormwater would be due to diesel drips and spills during

refuelling.

6.11.2 Mitigation

See measures required to mitigate diesel-refuelling risks above.

6.12 Stormwater Management

Stormwater will be managed according to earthworks and drainage above prepared and implemented

by the landowner.


Page | 22

Figure 6.1. Wind Rose for City of Gosnells.

7 Limitations

Page | 23

7.0 Limit ations

This report has been prepared in accordance with the usual care and thoroughness of the consulting

profession for use by Perth Asphalt Supply Pty Ltd in application to the Department of Environment

Regulation on behalf of Perth Asphalt Supply Pty Ltd. The report is based on generally accepted

practices and standards at the time that it was prepared. No other warranty, expressed or implied, is

made as to the professional advice included in this report. It is prepared in accordance with

information provided by the client Perth Asphalt Supply Pty Ltd and various government agency

websites that are assume to be correct at the time of interrogation.

In regard to the methodology adopted and sources of information outlined in this report, no

independent verification of this information beyond the agreed scope of works has been undertaken

and the author assumes no responsibility for any inaccuracies or omissions. No indications were

found during the investigations that information contained in this report was false. Advice has been

sought from relevant public servants, however although this advice was provided in good faith, there

is no guarantee that the advice is accurate.

This report was prepared during May and July 2017 and is based on the conditions encountered and

information reviewed at the time of preparation. The author disclaims responsibility for any changes

that may have occurred after this time.

This report should be read in full. No responsibility is accepted for use of any part of this report in

any other context or for any other purpose or by third parties. This report does not purport to give

legal advice. Legal advice can only be given by qualified legal practitioners

Documents

Supplementary Information DWER - Works & Licensing ... · Supplementary Information DWER - Works & Licensing Application & City of Gosnells Development Application Asphalt Manufacturing