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 of Riverside Drive) ● Stage 5B (to the north of ~ 370m Minnamurra River). ● Sand resource to be extracted is estimated at 234,000 t and approximately 1,123,000 t respectively ~ 420m ● Mobile plant and equipment will be operated across both extraction areas. Extraction methods will be identical to those in Stages 2 and 3.
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.
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