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.