Blast Management Plan - Colac Otway Shire

HOLCIM (AUSTRALIA) PTY LTD

Blast Management Plan HOLCIM COLAC QUARRY, ONDIT

January 2020.

Prepared by Terrock Pty Ltd for Holcim (Australia) Pty Ltd

HOLCIM (AUSTRALIA) PTY LTD HVC-1908_Holcim Colac Quarry BMP_Final.docx Table o f Contents TERROCK

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Blast Management Plan HOLCIM COLAC QUARRY, ONDIT

TABLE OF CONTENTS

ABOUT THIS DOCUMENT 1 1 LEGISLATION, REGULATIONS AND GUIDELINES 1 2 GENERAL SITE REQUIREMENTS 2

2.1 Quarry Personnel and Contractor Requirements 2 2.2 Communications 2 2.3 Emergency Contacts 2 2.4 Emergency Assembly Point 2 2.5 Reporting incidents 2

3 RESPONSIBILITIES 3 4 SITE DETAILS 4 5 EXPLOSIVES 5

5.1 Explosives Products 5 5.2 Explosives Storage 5

6 BLAST DESIGN PROCESS 5 6.1 Blast Design Considerations 5 6.2 Blast Site Inspection 6 6.3 Blast Hole Drilling 6 6.4 Laser Profiling and Boretraking 6 6.5 Hole Loading Specifications 6

7 BLAST DAY PROCEDURES 7 7.1 Site Access 7 7.2 Blast hole charging 8 7.3 Blast Notifications 8 7.4 Blast Clearance Zones 8 7.5 Traffic Management 9 7.6 Blast Firing and Clearance Procedure 10

8 MISFIRES 11 8.1 Misfire Procedure 11 8.2 Misfire Treatment 11

9 OVERVIEW OF THE BLASTING PROCESS 12

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10 BLAST MONITORING 13 10.1 Ground Vibration and Airblast Limits 13 10.2 Ground Vibration and Airblast Monitoring 13 10.3 Video Recording 13 10.4 Flyrock Monitoring 13 10.5 Reportable Flyrock Events 13

11 MANAGING COMPLAINTS 14 13 POST BLAST ASSESSMENT/PERFORMANCE EVALUATION 14 14 RECORD KEEPING 14

HVC-1908_Holcim Colac Quarry BMP_Final.docx Table of Contents TERROCK

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ABOUT THIS DOCUMENT

A Blast Management Plan (BMP) is a compliance instrument used to manage the risks involved in the use of blasting explosives. The BMP outlines the standard procedures required at Holcim Colac Quarry to ensure blasts are planned and designed appropriately, adequate safety provisions are provided to protect property, site personnel and members of the public, and the impacts of blasting on the environment are limited.

The key requirements of a BMP are listed in AS2187.2 (2006) Explosives Storage and Use, Appendix A. The list also contains details of records that must be kept, including documentation pertaining to the design, loading and performance of individual blasts. This record may be used to improve blast performance, assist with investigations, and be made available to regulatory authorities on request.

1 LEGISLATION, REGULATIONS AND GUIDELINES

All activities required to conduct blasting operations at Holcim Colac Quarry must be undertaken in accordance with the following legislation, regulations and guidelines:

• Dangerous Good (Explosives) Regulations 2011 — S.R. 37/2011

• Australian Standard A52187.2-2006: Explosives-Storage Transport and Use, Part 2- Use of Explosives.

• Mineral Resources (Sustainable Development) Act 1990 (Vic)

• Mineral Resources (Sustainable Development-Extractive Industries) Regulations 2010 — S.R. 3/2010

• Occupational Health and Safety Act 2004— Act No. 107/2004

• Occupational Health and Safety Regulations 2017— S.R. 22/2017

• Australian Code for the Transport of Explosives by Road and Rail — 3rd Edition (2009)

• ERR Guideline - Ground Vibration and Airblast Limits for Mines and Quarries

• Holcim Australia & New Zealand (HANZ) Safety and Health Policy (2015)

• Holcim Australia & New Zealand (HANZ) Environmental Policy (2010)

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2 GENERAL SITE REQUIREMENTS

2.1 Quarry Personnel and Contractor Requirements

All Holcim personnel, contractors and visitors to Holcim quarries must comply with Holcim Australia's Safety and Health Management System as detailed in the company's SHE (Safety, Health, Environment) policies and zeroHarm strategy. In addition, all personnel involved in blasting operations at Colac Quarry must adhere to site specific requirements including the use of PPE (Personal Protective Equipment), onsite vehicle/driving rules and communication systems.

2.2 Communications

All persons involved with blasting operations at Holcim Colac Quarry must carry a UHF radio and observe any directions from the shotfirer and site management. Onsite communication is maintained through the quarry's UHF radio channels;

Quarry Pit, Plant and Stockpile Area Office Area

2.3 Emergency Contacts

UHF Channel 26 UHF Channel 25

Quarry Manager Beau Patton 0448 243 591

Shotfirer Stephen McMahon 0429 790 970

Office Manager/OHS Supervisor Doug Croxford Ph: (03) 5234 6200

Ambulance 000 Fire 000 Police 000 State Emergency Service (SES) 1800 226 226 Vic Roads Incident Response 13 11 70 Colac Area Health (Colac Hospital) (03) 5232 5100

2.4 Emergency Assembly Point

In the event of an emergency, all site personnel must follow site management directions. The quarry's emergency assembly point is located at the Visitor's Car Park at the Potters Road quarry entrance.

2.5 Reporting incidents

Incidents relating to environmental hazards and occupational health and safety issues will be reported to the following authorities in accordance with the relevant regulations.

WorkSafe Victoria 132 360 Earth Resources Incident Reporting 0419 597 010 EPA Victoria 1300 372 842


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3 RESPONSIBILITIES

The following details the allocation of responsibilities of persons involved in blasting operations. The shot firer shall ensure each person is capable to fulfil their assigned tasks with clear understanding of the requirements prescribed in this Blast Management Plan.

The primary responsibility for all blasting operations is that of the shotfirer and Quarry Manager. All persons handling explosives on site must have undertaken approved training and hold a valid UBE licence issued by WorkSafe Victoria.

Company Holcim (Australia) Pty Ltd Level 3, 290 Burwood Road Hawthorn, Victoria 3122 Ph: (03) 9286 2666

Site Address Holcim Colac Quarry (WA158) Potters Road Ondit, Victoria 3249 Ph: (03) 5234 6200

Quarry Manager (at January 2020) Beau Patton 0448 243 591

Shotfirer (at January 2020) Stephen McMahon 0429 790 970

Office Manager/OHS Supervisor Doug Croxford Ph: (03) 5234 6200

Responsibility for the supply and transport of explosives to and from the quarry is that of the explosives supply company under contract. Risk control plans and other documents relating to the supply and transport and use of explosives are available from the explosives supply company.

Explosives Supplier MAXAM (Australia) Pty Ltd Level 1, 549 Queen Street Brisbane, Queensland 4000 Ph: (07) 3717 1818

Under the quarry's contract arrangements, blasts are designed and loaded by a team consisting of Holcim personnel and licenced blasting technicians from the explosives supply company (MAXAM Technical Services). The blasting process is therefore a shared responsibility between these two parties. However, blasting outcomes are ultimately the responsibility of Holcim (Australia) Pty Ltd.

Contract Blasting Technicians MAXAM Technical Services 441 Upton Road Avenel, Victoria 3664 Ph: 0418 882 669

Contract services for blast hole drilling, face surveying and boretraking are provided by.

Blast Hole Drilling Impact Drilling Pty Ltd 31 Industrial Drive Sunshine West, Victoria 3020 Ph: (03) 9310 2011

Laser Face Profiling & Boretraking MAXAM Technical Services


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4 SITE DETAILS

The Holcim Colac Quarry (WA158) is a single-bench quarry located in the Newer Volcanics Basalt region of Southwest Victoria. The quarry is situated in Ondit, near the northern shore of Lake Colac, approximately 10km north of the township of Colac. The land around the quarry is predominantly used for cattle grazing.

Production rates at the quarry fluctuate with market demand. The maximum output of the quarry's processing plant is 350,000 tonnes per annum. Blasting is conducted at an average frequency of 2-3 blasts per month (24-36 blasts per year). Two separate blasts may be fired consecutively on the same day.

Blasting is to be conducted within approved areas in the northeast of WA158 (Stages 5 and 6). Sensitive sites (occupied houses) and infrastructure located within 1km of blasting operations are;

• Ondit-Warrion Road reserve, abutting the northern boundary of the quarry • Two residences located 720m and 980m (min.) from the extraction area.

All blasts must be designed and conducted in a manner that minimises blasting impacts at sensitive sites and provides and high level of safety for people and property.

WA15B

79,

(9'

Crtishiog Screeriing Flan!

Garry Entrance

1 EMERGENCY ASSEMBLY LOCATION

STAGE 5

FORMER . EX TRACTION AREAS

Holcim Colac Quarry Site plan

t e r Closest Residences WA158 Boundary Title Boundary Extraction (blasting) Area

Scale in Metres


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5 EXPLOSIVES

5.1 Explosives Products

The use of blasting explosives is required at Holcim Colac Quarry to extract basalt for processing into useable grades of aggregate products for local market. The following explosives products are to be used for blasting operations;

Bulk explosive Bulk emulsion or watergel product (pumped directly from truck into blast holes)

Primers Cast boosters, 150g & 400g units Initiation System Non-electric surface delay detonators, 17ms, 25ms, 42ms, 67ms

Non-electric down-hole-delays detonators, 450ms & 500ms Non-electric Lead-in-Line, Oms delay, 150m

The products listed above are transported as Class 1.1D explosives. Technical specifications and Material Safety Data Sheets for these products are available from the explosives manufacturer/supplier. Detonating cord, safety fuse and electric initiation systems will not be used at Holcim Colac Quarry.

5.2 Explosives Storage No explosives are to be stored at Holcim Colac Quarry. All explosives products and blasting accessories are to be brought to site by the explosives supply company on blast days. Unused products shall be returned to the explosives supply company's storage facility.

6 BLAST DESIGN PROCESS All blasts must be designed commensurate to the blasting objective, being;

• Minimising the throw of rock fragments from the blast site • Minimising blasting impacts (ground vibration and airblast overpressure levels) • Achieving adequate blast performance (fragmentation, heave and diggability)

Due to the inherent variability of rock structures at quarries, blast design specifications may vary between individual blasts to achieve these outcomes.

6.1 Blast Design Considerations Considerations to inform the basis for the design of individual blasts are;

• Blast type •

Free face/production blast Ramp blast Sump blast Choke/Box Cut blast

• Blast location

- Distance to the Work Authority/title property boundary - Distance to public access areas - Distance and face direction in relation to sensitive sites (residences) - Distance to quarry plant, infrastructure and equipment


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• Rock type and structure

- Hardness classification - Structure — e.g. massive, laminated, joint spacing - Presence of faults cavities, clay seams and pockets of loose material

6.2 Blast Site Inspection Blast sites shall be visually inspected by the shotfirer and MAXAM technicians prior to the development of a blast's design. The structure of the rock mass, as indicated by the appearance of the ground and face surface NA! be noted to guide drill pattern specifications such as front burden, inter-row burden, hole spacing and sub-drill provisions.

6.3 Blast Hole Drilling All blast holes shall be drilled by an experienced rig operator to design specifications.

The rig operator must produce a record of observations taken during the drilling of each blast hole, noting;

• Hole depth and hole deviation

• The presence and locations of suspected inconsistencies in the rock structure including (but not limited to);

- cavities and voids - clay seams and faults - pockets of loose or highly fragmented material

The driller's log shall be provided to the shotfirer and MAXAM technicians on completion of drilling to identify individual holes where modified loading specifications are required to address any inconsistencies that may compromise the confinement of explosives energy.

6.4 Laser Profiling and Boretraking True face burden, hole depth and hole deviation will be confirmed by laser face profiling and boretraking prior to blast charging. Reports of these surveys NA! be provided to the shotfirer for review. Survey reports and driller's logs will be used by the shotfirer and MAXAM technicians to determine appropriate loading specifications for individual blast holes.

The depth and clearance of each blast hole NA! also be checked with a weighted tape measure to check for any change in hole condition immediately prior to loading.

6.5 Hole Loading Specifications Blast holes NA! be loaded to standard design specifications excluding holes that are affected by under-burdening and/or structural weakness, as identified by;

• Face profile reports showing actual min. front row burden to be below min. specification.

• Driller's log showing evidence of front row blast holes intersecting significant clay seams, faults, cavities, wide jointing planes or structural inconsistencies.

• Face inspection showing evidence of significant seams, faults or areas of highly fragmented/loose material.

• Subdrill depth confirmed to exceed 1.0m

• Boretraking reports showing significant blast hole deviation or intersection


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In areas of the blast site where one or more of the above conditions are present or suspected, affected holes shall be loaded in a manner that improves the confinement of explosives energy.

Appropriate actions to address the above are:

Issue Action Under-burden or inadequate confinement near toe

A sufficient quantity of rock/crusher dust to be placed against the toe of the face to increase confinement (artificial burden).

Under-burden or inadequate confinement at mid face

Hole may be loaded with decked charges i.e. 2 separate explosives columns loaded min 1.0m below and 1.0m above the area of under-burden/inadequate confinement, separated by a deck of stemming material.

Under-burden or inadequate confinement near top of explosives column

Reduce the height of the explosives column to min. 1.0m below the area of under-burden/inadequate confinement with additional stemming material added from the top of the explosives column to the hole collar.

Multiple or significant area(s) of under-burden or structural weaknesses at face

Entire blast hole to be fully stemmed (uncharged).

Overdrill (> 1.0m subdrill) Stemming material added to bottom of blast hole to reduce hole depth to design specification.

Blast hole intersects or deviates to within 1.0m of neighbouring hole

Stemming material added to bottom of blast hole(s) to reduce hole depth to >1.0m above potential intersection area.

Stemming material used at the quarry must be quality aggregate of a grade at least 1/10th of the blast hole diameter. 10-14mm aggregate provides adequate results for standard quarry blasting and will continue to be used for all blasting at Holcim Colac Quarry.

7 BLAST DAY PROCEDURES

7.1 Site Access A Toolbox Meeting of all quarry personnel is to be conducted on blast day mornings to discuss clearance procedures, estimated firing time(s) and any specific requirements pertaining to individual blasts.

On blast days, the blast site area shall only be accessed by approved personnel engaged with the blasting operation. Signage containing the words "Danger: Charged Blast Holes" or similar shall be placed at all access points to the blast site. A sign reading "Quarry Blasting Today" shall be prominently displayed at the Quarry office on blast days.

A "no work zone" is to be established within a 50m radius of the blast site in which non-blasting related work is not permitted. Heavy vehicles and machinery are to be kept clear of the blast site including the floor area in front of the face. Vehicles permitted inside the no work zone include bulk explosives trucks and light vehicles used by blasting personnel.


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7.2 Blast hole charging All blast designs developed by MAXAM technicians are to be approved and signed off by the shoffirer.

Blast charging shall not begin unless it is practicable to complete charging and firing the blast on the same day and within the quarry's approved firing window. The approved blast firing time window at Holcim Colac Quarry is:

11:00am - 3:00pm, Monday - Friday

Blast hole charging shall be undertaken by a team consisting of the shoffirer, approved Holcim personnel and MAXAM Technical Services. Unauthorised persons entering the blast site WIl be immediately reported to quarry management. Under no circumstances are charged blast holes be left unattended or unsecured.

All blast holes will be loaded to final design specifications under the direction of the shoffirer and in accordance with relevant practice shown in AS2187.2 (2006) and Dangerous Good (Explosives) Regulations 2011. Assembly of explosives system components WIl be conducted in accordance with manufacturer's specifications.

The blast hole delay sequence (tie-up) and connection of surface detonators shall be inspected by MAXAM technicians and the shoffirer and signed off by both parties.

7.3 Blast Notifications If or when required, notification of impending blasting shall be provided to relevant authorities and neighbouring landholders. A general notification may be issued a day or two prior to blast day. Secondary notification, specifying anticipated firing time(s) may be provided upon completion of blast hole charging.

7.4 Blast Clearance Zones The minimum allowable clearance distances to standard specification blasts (89mm diameter blast holes) have been determined by applying a Safety Factor of 4 to calculation of the maximum throw distance of rock fragments under standard design specifications;

The minimum clearance distances are;

• 160m in front of a blast face • 104m behind and to the sides of a blast face

Additional protection from the risk of flyrock shall be provided by evacuating all quarry personnel during blast firing times to the following areas;

• Visitor's Car park • Office/Weighbridge area • Plant Workshop area.

Assembly at these areas provides a minimum Safety Factor of 8 for personnel during blasting in approved extraction areas. The blast clearance zone shall be implemented and enforced in accordance with the procedures detailed in Section 7.6.


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7.5 Traffic Management

Traffic control on Ondit-Warrion Road must be implemented for all blasting within 80m o f the road reserve (Stage 6 area) as shown in the following plan. Blasts in this area must not face the road reserve and be drilled with reduced hole diameter to provide a reduction of charge mass. The extent of the blasting area in which traffic control is required may be subject to variation.

A valid council permit for traffic management is required and traffic control must be conducted by approved, trained personnel.

The designated traffic control points are;

• The crossroad intersection of Ondit-Warrion Road/Potters Road/Rattrays Road. • Ondit-Warrion Road at a minimum distance 100m east of the WA158 boundary.

Al l blasts within 80m o f WA boundary

- require traffic control

- must face away from road reserve (west, south or east facing blasts only)

- require reduced blast hole diameter (80mm)

B l a s t m g Area requiring Traff ic C o n r r o f along O n d i t - W i

•

Road closure will be required for approximately 5-6 minutes. UHF radio communication between the shotfirer and traffic controllers will allow emergency vehicles to safely pass through the closure zone.


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7.6 Blast Firing and Clearance Procedure

The blast clearances procedure shall commence 30 minutes prior to the designated firing time and must be be conducted in the following order:

30 minutes before blast • All site personnel notified of impending blast and ordered to make their way to the approved assembly area (office-car park-workshop area).

15 minutes before blast • Bollards placed across access tracks to the blast site area. • Quarry gates closed to incoming vehicles • Office manager conducts a check of the quarry's Personnel

and Contractor Management System to confirm the whereabouts of all personnel.

• Shotfirer inspects the clearance zone. • Blasting shall only proceed i f all site personnel are

confirmed to be within the assembly area.

4 minutes before blast • Shotfirer orders the commencement of the warning siren sequence and withdraws to blast shelter.

• Clear UHF channel (26) established between the shoffirer, office manager and traffic controllers Of applicable)

• Closure of Ondit-VVarrion Road commences Of applicable). • Blast siren sounds three times

1 minute before blast • Blast siren sounds two times

5 seconds before blast • Blast siren sounds continuously for 10 seconds • Shotfirer calls "Firing" and initiates the blast.

1 minute after blast • Shotfirer leaves blast shelter and inspects blast site to check for misfire.

• If no evidence of misfire is present, shotfirer gives the "all clear".

• Blast siren sounds for 5 seconds to signal all clear status • Traffic control on Ondit-VVarrion Road ends Of applicable) • Normal quarry activity may resume.


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8 MISFIRES

8.1 Misfire Procedure

If the shotfirer suspects that one or more blast holes have not initiated during the post-blast inspection, a misfire will be declared.

In the event of misfire;

• the "all clear" siren will not be sounded.

• After minimum waiting period of 5 minutes, a thorough inspection of the blast site will be undertaken by the shotfirer and/or blasting technicians to determine the nature and cause of the misfire.

• The blast clearance zone (including traffic control) will remain in place until the shotfirer declares the misfire site to be safe.

• The misfire site area will remain secured and only be accessed with approval from the shotfirer or quarry manager.

• When an appropriate course of action for treating the misfire is determined, a Misfire Risk Assessment will be conducted.

• If the misfire can be safely treated by reconnecting unfired blast holes and re-firing, the standard firing procedures (sirens, clearance zones, traffic control, etc.) will be followed.

• If the misfire can be treated by refiring, the minimum blast clearance distance must be reviewed as part of the Risk Assessment process.

8.2 Misfire Treatment

Misfires will be treated in accordance with the steps prescribed in AS2187.2 (2006): Section 10. These steps are summarised as;

A. Inspect the unfired blast holes to determine if the initiating system can be re-connected and the shot re-fired.

B. If the shot cannot be safely re-fired, the misfire may be treated by removing one or more of the explosives components from the blast hole. This may be achieved by removing stemming material and flushing the blast hole with high pressure water, or a mixture of water and compressed air.

C. If the misfire cannot be treated using Steps A or B, it may be possible for the charge to be removed by mechanical means using an experienced excavator operator and a nearby spotter to provide assistance in identifying the location of the unfired explosives.

Note: I f a misfire cannot be treated on the day o f the blast, WorkSafe Victoria shall be notified and the blast site will remain secured overnight.


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9 OVERVIEW OF THE BLASTING PROCESS

The basic blasting process, including considerations that inform blast design and hole loading, are shown in the following flowchart. The flowchart shows blasting as part of an ongoing review loop to help inform future blasting practice to improve outcomes.

BLAST DESIGN PROCEDURE

B L A S T D E S I G N BASIS

BLAST LOCATION

- Distance to W.A./Lease boundary - Distance & direction to sensitive sites (houses) - Distance to public access areas - Environmental design or performance design

ROCK TYPE/STRUCTURE

- Hardness classification - Structure - eg. massive, laminated, joint spacing - Muckpile loading - shovel/loader

INITIATION SEQUENCE

- Face blast - Ramp blast - Sump blast

Choke blast

ENVIRONMENTAL DESIGN CONSIDERATIONS

B L A S T DESIGN SPECIFICATIONS F O R E A C H BLAST

V - Hole diameter

- Face height

- Hole angle

- Sub-grade

- Hole depth

- Stemming height

- Column height

- Explosive density

- Maximum explosive charge

- Powder factor

- Burden

- Spacing

- Initiation sequence - Deck location

- Internal Stemming

- Air decks

FIRE BLAST

A S S E S S M E N T O F RESULTS

ENVIRONMENTAL COMPLIANCE RECORD

- Airblast - Ground vibration - Flyrock contained

- Ground vibration (Max. charge from Site Law) - Airblast (Min. front burden & stemming height)

Flyrock (Min. front burden & stemming height)

/IMPORTING PROTOCOL \

- In house c. ERR, EPA, WorkSafe

DESIGN LOADING & EXPLOSIVE "BLAST EFFICIENCY \ DISTRIBUTION FROM FACE INSPECTION AND BORETRAK FACE PROFILES ISSUE NOTIFICATIONS - Visual Assessment

- Fragmentation - Under-burdened sections LOAD BLAST - Heave - Face height - Muckpile shape - Location of inconsistencies/faults/seams IMPLEMENT - Need to deck CLEARANCE ZONES - Blast hole deviation

BEGIN SIREN SEQUENCE 4.- LAST PERFORMANCE

- Diggability

OTHER CONSIDERATIONS - Fragmentation - Production rates

- Blast Clearance Zones - Oversize - Quarry/Mine infrastructure - Impactor hours - Safe Firing point \.

ANALYSE AND REVIEW' DESIGN PARAMETERS

- Modify parameters

REVIEW AND RECORDING OF PERFORMANCE ASSESSMENT


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10 BLAST MONITORING

10.1 Ground Vibration and Airblast Limits

Ground vibration and airblasts levels from all blasting operations at Holcim Colac Quarry must comply with regulatory limits specified by Earth Resources Regulation (ERR), a branch of the Victorian State Government Department of Jobs, Transport and Precincts. The limits apply at "sensitive sites", being "...any land within 10 metres of a residence, hospital, school, or other premises in which people could reasonably expected to be free from undue annoyance and nuisance caused by blasting." The limits that apply for all blasting at Holcim Colac Quarry are;

Ground Vibration

Airblast Overpressure

5mm/s Peak Particle Velocity for 95% of blasts 10 mm/s Peak Particle Velocity for all blasts

115 dBL for 95% of blasts 120 dBL for all blasts

10.2 Ground Vibration and Airblast Monitoring Blast monitors will be installed at the closest sensitive site(s) by independent consultants prior to each blast. Blast monitoring equipment must meet the technical specifications of, and be installed in accordance with the methods shown in A52187.2 (2006): Appendix J.

The routine blast monitoring locations near Holcim Colac Quarry are;

• Primes' residence, 90 Potters Road, Ondit • Gnarwyn (front gate), 960Colac-Ballarat Road, Ondit

A record of blast monitoring reports will be maintained and be made available to the regulatory authorities for inspection or audit upon request. Any blast resulting in an exceedance of the ERR ground vibration and airblast limits will be immediately reported to the regulator. The cause(s) of high ground vibration or airblast levels may be investigated to help improve blast performance or as ordered by the authority.

10.3 Video Recording Video recording of each blast will be conducted to help assess blast performance and assist with investigations of high airblast levels or excessive flyrock throw. Video cameras may be installed by independent consultants, quarry personnel or technicians from the explosives supply company.

10.4 Flyrock Monitoring Visual evidence of the throw of rock fragments (flyrock) from blast sites will be recorded, primarily through video recording of blasts and shotfirer observation. If rock fragments from a blast are thrown well beyond anticipated distances, or a reportable event has occurred, the location and distance to the furthest landing point from the blast site shall be recorded by use of still camera, measuring tape or GPS, and video review.

10.5 Reportable Flyrock Events The occurrence of a flyrock event at Holcim Colac Quarry will be reported by Holcim to VVorkSafe Victoria if:


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• The flyrock event resulted in damage to property

• Rock fragments were thrown beyond the minimum blast clearance distance and/or resulted in an increased hazard to people (a near miss).

• Rock fragments were thrown across the work authority/quarry boundary into adjacent property and/or public land.

• The flyrock resulted in injury to a person.

11 MANAGING COMPLAINTS A register of complaints will be maintained at the quarry office, recording details of the complainant location, time, date and nature of the complaint. Information on quarry activities including blast morning results will be made available to community members on request.

Any claims of damage to property from blasting that may arise will be investigated by quarry management and/or a qualified consultant in a timely manner.

13 POST BLAST ASSESSMENT/PERFORMANCE EVALUATION Blast performance WIl be assessed by maintaining a record of observations to assist with improving blasting outcomes for future operations. Such observations include (but are not limited to) the following;

• General performance (e.g. fragmentation, heave, efficiency)

• Flyrock observations (e.g. flyrock contained, stemming ejection, maximum throw distance)

• Weather conditions at blast time (sunny, overcast, raining, wind speed and direction)

• Ground vibration and airblast levels recorded at sensitive site

• Any breaches of blast clearance procedures

• Details of any complaints or reportable incidents

14 RECORD KEEPING All documents related to each stage of the blasting process will be kept for future reference or audit. Relevant documents include (but are not limited to):

• Blast design plans • Drilling plans • Driller's logs • Face profiling and boretrak reports • Hole loading records • Initiation sequence plans • Blasting procedure checklists • Post-blast assessment/performance observations • Cart notes showing explosives quantities used • Blast monitoring reports • Blast video files


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Blast Management Plan - Colac Otway Shire

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