Dunmore Sand and Soil Modification 2 - Stage 5

10 April 2019 Community Briefing Presentation

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

of 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

of 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

offline.

● The channel has been

designed to allow settling

of 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

operational dredge pond.

● The circuit shown in yellow is kept

offline 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.