Dunmore Sand and Soil Modif ific ication 2 2 - Stage 5 10 10 - - PowerPoint PPT Presentation

Dunmore Sand and Soil

Modif ific ication 2 2 - Stage 5

10 10 Apr April il 20 2019 19 Com Communit ity Brie riefin ing Pre Presenta tati tion

DSS Mod 2 Briefing - Introduction

Agenda

• Welcome - Paul Jackson (Stakeholder Relations Manager) and Matthew

Banks (DSS Quarry Manager)

• Overview of MOD 2 - Adnan Voloder (Planning and Development Manager)
• Ecology - Adnan Voloder and Simon Tweed (Niche Consulting)
• Water management - Ben Williams (Dunmore Environmental Co-ordinator)
• Other issues nominated by visitors/questions - Residents
• Conclusion

DSS Mod 2 Briefing - Overview

DSS Mod 2 Briefing - Overview

DSS Mod 2 Briefing - Introduction

• Modification to existing

approval to establish additional extraction areas (Stage 5)

• Extraction is proposed in two

separate extraction areas, namely Stage 5A and 5B

• Stage 5A (immediately south
• f Riverside Drive)
• Stage 5B (to the north of

Minnamurra River).

• Sand resource to be extracted

is estimated at 234,000 t and approximately 1,123,000 t respectively

• Mobile plant and equipment

will be operated across both extraction areas. Extraction methods will be identical to those in Stages 2 and 3. ~ 370m ~ 420m

DSS Mod 2 Briefing - Stage 5A

• Stage 5A
• Establishment Process

Clearing and grubbing of groundcover vegetation. Topsoil stripped and stockpiled, for later re- use in rehabilitation. Earth mounds will be formed using a dozer to construct the flood protection bunding for the dredge pond.

• Rehabilitation

Stage 5A backfilled with VENM, topsoil spread and groundcover vegetation planted to return the land to pasture.

• Indicative timeframes

1-3 years

DSS Mod 2 Briefing - Stage 5B

• Establishment Process

Same as 5A

• Rehabilitation

Stage 5B will be left as a freshwater pond, inline with existing practices implemented in Stage 2 - includes: ·Appropriate edging being implemented on the lake edge, to provide additional habitat for native fauna; ·Plant species planted along the lakes edges will be selected to maximise the bank stability; ·A fringing wetland community being created along the western and southern boundary, complemented by adjoining tree stands, improving habitat diversity; ·stabilise re-profiled areas as soon as possible, minimise potential erosion and degradation of areas

• f exposed topsoil.
• Indicative timeframes

~ 4-5 years

DSS Mod 2 Briefing - Stage 5B - Rehabilitation

DSS Mod 2 Briefing - Ecology

• Role of Ecologist
• Initial Engagement
• Survey work completed
• Findings of Surveys completed

DSS Mod 2 Briefing - Ecology

• NSW major projects assessed under BC Act using 3-stage approach of:

○ Avoid ○ Mitigate ○ Offset

• Avoidance measures have focused on avoiding the majority of native vegetation and impacts on

adjacent areas mapped as Coastal Wetlands including proximity areas.

• Mitigation measures will primarily involve clearing controls, a rehabilitation plan and protection of

adjacent areas.

• Offsetting will be done in accordance with the NSW Biodiversity Assessment Methodology

DSS Mod 2 Briefing - Ecology

• Disturbance footprint is not

within the Coastal Wetlands Proximity Area (Buffer Area) and the Coastal Wetland itself.

• Design was specifically

done to avoid impacts to coastal wetlands areas

DSS Mod 2 Briefing - Ecology

DSS Mod 2 Briefing - Ecology

DSS Mod 2 Briefing - Ecology

DSS Mod 2 Briefing - Ecology

Current Operations Water Management: Stage 2

• Stage 2 is the former dredge pond. It is

being backfilled for rehabilitation.

• The pond is online to Rocklow Creek.

The pond was kept offline until the size of the pond was maximised.

• There is a valved transfer pipe which can

turn discharge offsite on/off.

• Water quality is measured monthly and

after 20mm of rainfall in 24 hours. Monitoring points are shown in red.

Current Operations - Site Discharge

• The re-aligned channel

was designed to keep the Stage 3 dredge pond

• ffline.
• The channel has been

designed to allow settling

• f water in the case of

high rainfall.

• Has been designed so it

does not inhibit natural flows and to mimic the flow of the former Western Tributary channel.

• The water supply from

Stage 2 to this channel is valved so the site can turn discharge on/off.

Current Operations - Site Discharge

Current Operations - Site Discharge

Current Operations - Site Discharge

DSS Mod 2 Briefing - Current Ops Water Management

• The Stage 3 pond is the current
• perational dredge pond.
• The circuit shown in yellow is kept
• ffline to Rocklow Creek. No water

flows from this offline circuit expect in the case of an overflow.

• The fines pond is protected by a 3.7m

bund which was designed to protect against a 1 in 100 year rainfall event.

• Dredging and backfilling will cease if

there is less than 30cm freeboard within the dredge pond.

• Water Quality is measured monthly.

Monitoring points are shown in red.