Due Diligence and Landfill Capability Assessment Lot 12 Kirwan Road Shire of Esperance
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Due Diligence and Landfill Capability Assessment Lot 12 Kirwan Road Shire of Esperance Assets | Engineering | Environment | Noise | Spatial | Waste Due Diligence and Landfill Capability Assessment Lot 12 Kirwan Road Prepared for Shire of Esperance March 2017 Project Number: TW17001 TW17001-Due diligence Site 19.1b March 2017 | Page 1 Due Diligence and Landfill Capability Assessment Lot 12 Kirwan Road Shire of Esperance DOCUMENT CONTROL Version Description Date Author Reviewer 0a Internal Review 10/1/17 EP RC 1a Draft released to Client 17/3/17 EP RC 1b Final released to Client 24/3/17 EP RC Approval for Release Name Position File Reference Director – Waste Ronan Cullen Management Section TW17001-Due diligence Site 19.1b Leader Signature Copyright of this document or any part of this document remains with Talis Consultants Pty Ltd and cannot be used, transferred or reproduced in any manner or form without prior written consent from Talis Consultants Pty Ltd. TW17001-Due diligence Site 19.1b March 2017 | Page i Due Diligence and Landfill Capability Assessment Lot 12 Kirwan Road Shire of Esperance Executive Summary The Shire of Esperance (the Shire) currently operates the Wylie Bay Waste Management Facility (WMF) which includes a Materials Recovery Facility (MRF) and a Class II (putrescible) landfill. The current landfill cell at the site is approaching the end of its operational lifespan and therefore, the Shire has identified the need for long term disposal options. To allow for the continuation of these critical current waste management services, the Shire commissioned the preparation of a Waste Disposal Strategy in 2012 which examined the options for long-term waste disposal. The establishment of a modern WMF at a new location within Esperance was identified as the best option for the Shires future waste needs. Since 2013, the Shire and Talis Consultants (Talis) have been working on a landfill site selection study to determine the most suitable location for the placement of a new WMF. Initially the focus was on Shire and Crown Land which then focused on Freehold Land. Arising from the works, Lot 12 Kirwan Road, Merivale (the Site) was identified as a site that warranted further consideration. Therefore this report investigates the Site as a potential location for the WMF through the assessment of the environmental and social values in comparison to Best Practice Environmental Management (BPEM) Guidelines. The study also assesses the environmental approval pathway for the project. The Site is located on Lot 12 Kirwan Road, Merivale, Western Australia (WA) within the Shire approximately 13km from the Esperance Townsite. The Site covers an area of 332Ha which has been historically cleared for agricultural purposes and now consists of a Tasmanian Blue Gum Plantation. The environmental and social attributes of the Site were assessed through a desktop review and where relevant, confirmed through site investigations. The environmental and social attributes of Site are summarised in the table below. Attribute Summary Topography The Site topography ranges from 62m AHD to 72m AHD from south to north. The Department of Mines and Petroleum (DMP) described the underlying geology as consisting of Granitic gneiss and metagranite. The overlying geology forms the Plantagenet Group which consists of the Werillup Formation and the Pallinup Formation. The Pallinup Formation consists of Pallinup Siltstone, a light coloured and often banded siltstone and spongolite. The DMP describe the Geology surface geology for the Site as sand or gravel plains consisting of quartz sand sheets commonly ferruginous pisoliths or pebbles, minor clay, local calcrete, laterite, silcrete, silt, clay, alluvium, colluvium and aeolian sand. There are no fault lines located within the Site. The nearest fault line is 1.7km east of the landfill boundary. The geotechnical investigation indicated that the soils across the Site are generally homogenous and consisted of the following: Sand - Loose to dense, fine grained and generally corresponding to the root Soils zone for the surrounding Tasmanian Blue Gum trees; Sandy silty clay- Firm to stiff of low plasticity; Sandy clay - Stiff with moderate plasticity; and Interbedded sandstone and siltstone representing the Pallinup Formation. Acid Sulphate The desktop assessment indicated that the Site has a low probability occurrence Soils of Acid Sulphate Soils (ASS). Observations during the hydrogeological TW17001-Due diligence Site 19.1b March 2017 | Page ii Due Diligence and Landfill Capability Assessment Lot 12 Kirwan Road Shire of Esperance Attribute Summary investigations confirmed the absence of ASS in the Site. The Department of the Environment and Energy (DotEE) Protected Matter Search Tool (PMST) identified a total of four significant flora species or habitats likely to or that may occur within a 5km radius. The Department of Parks and Wildlife (DPAW) Flora results indicated that sixty nine priority flora species and nine Threatened species were located within a 20km radius of the Site. The Flora survey confirmed that no Threatened or Priority Flora Species are located within the Site. A search of DPAW databases for Threatened and Priority Fauna found forty seven fauna species of Conservational Significance identified within a 20km search area of the Site. This included marine species which will not occur within the Site. Fauna The DotEE PMST identified a total of 10 Listed Threatened Species and seven Listed Migratory Species identified within the 5km search area. The Fauna survey confirmed that no Threatened or Priority Fauna species are located within the Site. The DotEE PMST indicated that the Site is located within mapped distribution of an Endangered TEC ‘Proteaceae Dominated Kwongkan Shrublands of the Southeast Coastal Floristic Province of Western Australia’. The distributed Ecological mapping of this TEC was regarded as ‘indicative’ only. Communities DPAW results indicated that the ‘Proteaceae Dominated Kwongkan Shrublands of the Southeast Coastal Floristic Province of Western Australia’is have been recorded within a 5km buffer of the Site. The Flora survey confirmed that no TEC or PECs are located within the Site. Environmentally The Site is not located within an ESA. Sensitive Areas A small area on the southern boundary is mapped as a Bushfire Prone Area and Bush Fire Risk as the Site is predominantly a Tasmanian Blue Gum Plantation, a Bushfire Area Assessment and Fire Management Plan will need to be prepared as part of the development of the Site. Public Drinking The Site is located outside of any Public Drinking Water Source Areas (PDWSAs), Water Source with the nearest recorded PDWSA being located approximately 16km to the Areas south west and is defined as a PDWSA Priority 1 ‘Esperance Water Reserve ’. Surface water within the Site consists of small constructed dams. A minor ephemeral creek line is located immediately north of the Site. The creek line is associated with Bandy Creek located approximately 2km to the West. Another Surface water creek line (Doombup Creek) is located to the south east of the Site which feeds into Doombup Lake. Small surface water bodies are located south of the scarp where groundwater is expressed. A portion of the Site is located in the Lake Warden Wetlands Catchment (Bandy Catchment Creek Sub -Catchment) which is classified as Priority 2 catchment area. areas Approximately 70% of the Site is located within the Doombup Catchment of which 90% has been cleared for pastoral purposes. The nearest RAMSAR wetland is approximately 15km to the west of the Site. The wetland is identified as the Lake Warden System. Two Regionally Significant Wetlands Wetlands Bannitup Lake and Doombup Lake are located approximately 3.5km and 2km south of the Site. These wetlands are proposed to be included in the Mullet Lake Reserve Extension therefore a precautionary approach has been TW17001-Due diligence Site 19.1b March 2017 | Page iii Due Diligence and Landfill Capability Assessment Lot 12 Kirwan Road Shire of Esperance Attribute Summary taken in the event these lakes are classified as RAMSAR. The nearest Floodplain 100 year ARI area is 2 km west of the Site, and is Floodplains associated with Bandy Creek. Groundwater within the region is classified as generally brackish to saline. The Groundwater results from the Geotechnical Investigation indicated that the depth to Proclaimed Areas groundwater ranges between 15.12 metres below ground level (mBGL) to 2.5 mBGL. Department of Water (DoW) 1:250,000 Hydrogeological Map identifies two distinct aquifers: Aquifers Sedimentary aquifer-extensive aquifer, minor to major resources; and Fractured and weathered rocks – Local aquifer, very minor to no resources The Hydrogeological Investigation indicated that the groundwater was brackish, and sometimes exceeded Stock Water 2000 Guideline levels. Groundwater was noted to be flowing in a south west direction. The groundwater levels across the Groundwater Site vary from 2.5mBGL to 15.12mBGL. Hydraulic conductivity across the Site was calculated to be a maximum of 0.38 m/day. Darcy’s seepage velocity was determined to be 2.59 m/year. The Site is located outside of any proclaimed surface water areas, with the Surface Water nearest being over 300 km to the west associated with the ‘Warren River and Proclaimed Areas Tributaries’ area. The Department of Environment Regulation (DER) confirmed that the Site has not Contaminated been reported as a known or suspected contaminated site prior to or after the Sites Database commencement of the Contaminated Sites Act 2003. The FOI request submitted to the DER indicated that there are no records found for the Site. DPAW advised that there were no Declared Rare Flora (DRF) or Priority State Flora (PF) known to occur within the Site, however, the absence of records does Government FOI not indicate that there are no species present. The Flora and Fauna survey confirmed there is no DRF or PF within the Site. Aboriginal No known sites of Aboriginal significance are known to occur within the Site.