Group Meeting #2 >Welcome Mittagong RSL 8 October 2018 Agenda - - PowerPoint PPT Presentation

Berrima Colliery - Closure Working Group Meeting #2

Mittagong RSL 8 October 2018

>Welcome

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Agenda

• 1. Welcome and Apologies
• 2. Review of minutes & actions
• 3. Terms of Reference
• 4. Groundwater storage volume
• 5. Water Quality Trends and Preliminary Macroinvertebrate Comments
• 6. EPA Presentation – Ecotoxicology Study
• 7. Bulkhead Seals Explanation
• 8. EPL/MOP Updates
• 9. Communications Plan

10.Loch Catherine Update 11.General business 12.Next meeting

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Welcome - CWG Representatives, Apologies & Guests

• Boral - Fabio Colusso, Greg Johnson, David Spears,
• Resource Regulator - Greg Kininmonth, Will Mitry
• Environment Protection Authority - William Dove, Andrew Couldridge
• WaterNSW - Ravi Sundaram
• Wingecarribee Shire Council - Barry Arthur (apologies), Proxy?
• Western Sydney University - Dr Ian Wright
• Community - Clive West, Alan Lindsay, Graham Kelly, Ray Nolan, Julian

Brophy

• Independent chair - Brad Mullard
• Minute taker – Rob Byrnes
• Guest - Pamela Klioufis

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Review of Minutes – suggested amendments

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Review of Actions

• CWG Terms of Reference and that it is not the only way Boral will engage with the Community

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Terms of Reference

Minor change to clarify that the CWG will not be the only way Boral engages with the Community.

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Estimated volume of water contained in the workings

548ML (Based on: Mine ceasing discharge on 1/09/2015 and free draining on 21/03/2016. 203 days X 2.7ML = 548ML)

There was also a question in relation to the size of the mine void in total: 5.5 million m2 x 2.2 m (seam height) x 0.4 (% recovery) = 4.8 Million cubic metres This equates to around 7 Million tonnes (using SG of 1.45). Or 4,800 ML if all the void could be filled with water, which wouldn’t happen

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The underground treatment was installed in 3 stages from early December 2017 until mid January 2018

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Site and surrounding environment

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Discharge Volumes

• Additional pumping commenced

early August 2018

• Water level has now dropped 800-

900mm

• Sufficient level to install bulkheads
• Additional pumping has ceased and

will revert to likely levels of 2.7ML average

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Water Quality Trends - pH & EC

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Water Quality Trends - Iron and Manganese

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Water Quality Trends - Nickel and Zinc

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Water Quality Trends along the treatment path - Iron example

• 400 D12 Sump - Pump

pick up location

• 400 C8 - After

aeration, treatment through lime bed and filtered through goaf

• Adit Discharge - V -

Notch sample

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Macroinvertebrate study update - Preliminary findings

Based on (two sampling occasions in Autumn 2018) similar story to what was observed previously (2017), although thorough analysis not been completed at this stage.

• There was a loss of sensitive order mayflies (families Baetidae, Caenidae and Leptophlebiidae) and riffle beetle Elmidae upto

1km d/s of the adit.

• Stonefly Gripopterygidae was observed to be impacted 100m downstream (in 2017), however at 300-500m d/s this was not as

evident and appears to have recovered 500m d/s.

• There was some caddis missing (Philopotamidae) 500m d/s however they were present in good numbers 1km d/s.
• In general there appears to be an impact up to 1km downstream, however the macroinvertebrate fauna appear to be recovering

at this distance downstream.

• At 2km downstream the aquatic fauna appears to have fauna that were missing at sites 500m d/s and 1km d/s and I suspect

closer to upstream reference condition.

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EPA Presentation – Ecotoxicology Assessment

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Interim Sealing Plan - Location in respect of workings

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Bulkhead Seal design - Explained

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Environmental Protection Licence/ Mine Operations Plan Updates

EPL 608

• Background - Special Condition R3 was added to the EPL late last year as a means to monitor the

performance of the underground treatment trial. The condition requires water quality summary reports to discuss effectiveness of the trial every 2 - 6 months and annual scientific reports including sediment and macroinvertebrates due annually on 31 Jan 2019 and 31 January 2020.

• Boral difficulties

○ The Special Conditions were agreed prior to the installation of the complete system. ○ The full treatment system was not operational until mid January 2018. ○ Weather and other conditions (bushfire) can vary time of month sampling ○ Laboratory results can take 7+ days from sampling to be received ○ Macroinvertebrate numbers even longer ○ Time required to analyse and assess trends

• Administrative request submitted to the EPA to vary submission dates by 6 weeks

“to allow more time for the licensee's consultants to complete and synchronise the in-situ water quality, sediment and macro- invertebrate sampling and report preparation as required in the Performance Monitoring Program”.

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Environmental Protection Licence/ Mine Operations Plan Updates

MOP - Stage 1 Mine Closure Plan Background - The current approved closure plan dated January 2018 excludes detail on the proposed

• bulkheads. Post the last CWG Boral provided the Resources Regulator a letter update on the bulkheads as

an attachment to the Stage 1 Plan.

• The RR requested feedback from Water NSW and the NSW EPA.
• The RR also requested evidence from Mine Safety they were satisfied with proposed designs
• WaterNSW and the EPA requested how waters will be monitored during and post installation of

bulkheads. Boral Actions

• Boral has agreed to an updated sampling plan that will be included in a letter amendment to the

MOP.

• Once the final bulkhead designs are finalised, Boral will further consult with Mine Safety and provide

correspondence with the RR

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Communication Plan - Workshop

Pamela Klioufis

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Loch Catherine Update

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General business

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Next meeting date

Proposing: Monday 11 February 2019 9am – 1pm Location – Berrima Colliery (including a pit top site inspection)