Kendall Bay Sediment Remediation Project Community Information and - - PowerPoint PPT Presentation

Kendall Bay Sediment Remediation Project

Community Information and Feedback Session 29 July 2014

Presentation overview

• Project update
• Technical assessments for the Environmental Impact

Statement – preliminary findings

• Q and A

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Project update

• Jemena Limited (Jemena) intends to secure development

consent to remediate two defined areas within Kendall Bay bordering the former Mortlake Gasworks site

• The key objectives of the Project are as follows:

– Jemena to fulfil their obligations under their VRA with the EPA – to alleviate the current risk to human health associated with the contaminated sediments within the remediation areas – to alleviate adverse ecological impacts caused from the contaminated sediments

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Project update and timelines

• Currently awaiting outcome of Jemena’s State Significant

Development application as well as updated Environmental Assessment Requirements (EARs)

• Subject to the above, it is planned to lodge the EIS during

Sept 2014, to the Department of Planning & Environment (DP&E), for the test of adequacy

• The EIS will subsequently be placed on public exhibition –

proposed 4th Quarter 2014

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Project area

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Impact assessment methodology

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Source: ERM 2012

Acoustic impact assessment Hydrology assessment Air quality/odour assessment Landscape & visual impact assessment Ecological impact assessment Social impact assessment Environmental hazard assessment Soil & water assessment Health risk assessment Traffic impact assessment Heritage impact assessment

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Technical studies for EIS

Summary of noise assessment

Methodology

• 1. Baseline studies and data
• Baseline noise monitoring (Sept 2012 and Nov/Dec 2013) to establish

existing noise conditions at sensitive receptor locations

• Noise source data collected for all project plant and equipment – noise

modelling to assess impact of remediation works on background (existing) noise levels

• 2. Impact Assessment
• Noise modelling across all project phases (site establishment,

remediation and decommissioning)

• Predicted noise levels compared against noise assessment criteria at

sensitive receptor locations

• 3. Mitigation Measures
• Appropriate mitigation/ management measures devised to manage

impacts

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Summary of noise assessment

Impact Mitigation Measures Significance of Impact with Mitigation

The proposed works will result in an increase in noise at sensitive receptor locations adjacent to Kendall Bay (5 – 15 decibel increase) Noise levels remain under the maximum guidelines allowed for construction (75 decibels)

• Implement best practice noise control

measures

• Community Consultation
• Noise Management Plan

Moderate Traffic noise from heavy vehicle movements will be up to 1 decibel above existing background noise levels

• Community Consultation
• Noise Management Plan
• Limited construction Hours

Minor

Summary of air quality/odour assessment

Methodology

• 1. Baseline studies and data
• Baseline odour monitoring (early 2014) at sensitive receptor locations
• Baseline sampling from sediments collected from remediation areas
• Review of existing meteorological conditions to inform air quality

modelling

• 2. Impact Assessment
• Odour and dust dispersion model predicts odour and dust levels at

sensitive receptor locations

• Odour and dust levels compared against EPA assessment criteria at

the sensitive receptor locations

• 3. Mitigation Measures
• Appropriate mitigation/ management measures devised to manage

impacts

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Summary of air quality/odour assessment

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Impact Mitigation Measures Significance of Impact with Mitigation

Odour concentrations below the assessment criteria* identified at sensitive receptor locations No emissions which are detrimental to human health will be released during the remediation works

• Odour control tent and pressurised

industrial building

• Cap excavated area during extraction of

sediment in the exposed shoreline area

• Covered skip bin during marine transport
• Odour suppressant foam

Minor Dust concentrations below the assessment criteria^ at sensitive receptor locations

• Dust suppressant sprays
• Covered skip bin during marine based

transport Minor

*Assessment criteria for odour is two units below the level set by the NSW EPA ^Assessment criteria for dust is two units below the level set by the NSW EPA

Summary of transportation assessment

Methodology

• 1. Baseline studies and data
• Traffic counts undertaken over a seven day period at three locations:

− Staging site (28 vehicle movements/day) − Tennyson Road (1,257 vehicle movements/day) − Hilly Street (1,183 vehicle movements/day)

• Review of all public transport and pedestrian access in the vicinity to the

Project

• 2. Impact Assessment
• Assessment of traffic impact on local roads - volumes, safety and efficiency
• Assess intersection impacts and level of service post project
• Identification of preferred and alternative haulage routes
• Assessment of cumulative traffic impacts associated with traffic volumes for

future developments in Breakfast Point

• 3. Mitigation measures
• Devise appropriate mitigation/ management measures

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Additional traffic from remediation works

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Stage Duration

• No. of Heavy

Vehicle Movements per Day Average Additional Heavy Vehicle Movements per Day Site establishment ~3 months 11 1 movement per hour Remediation ~6 months 22 2 movements per hour Site De-mobilisation ~3 months 11 1 movement per hour

Summary of transportation assessment

Summary of transportation assessment

Cumulative Impacts

• The assessment of the cumulative volume of traffic generated from both

the Project and the new developments in Stage 2 of Breakfast Point indicates the Project will create approximately 2% of the additional traffic

• n the surrounding road network

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Location Anticipated Daily Traffic Generation Proportion of Additional Traffic Generation

Staging Site Up to 22 heavy vehicle movements per day 1% Staging Site Up to 20 light vehicle movements per day (construction workers) 1% Surrounding Developments 2,014 vehicle movements per day 98%

Summary of transportation assessment

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Impact Mitigation Measures Significance of Impact with Mitigation

Increase in heavy vehicle movements causing traffic, operational and/or safety impacts

• Construction Transportation

Management Plan (CTMP)

• Traffic Control Plan (TCP)

Negligible 10 car spaces onsite will reduce to 5 - potential overflow in the vicinity of the staging site

• CTMP
• TCP
• Provision of additional on-

site parking Negligible Potential disruptions to local transport

• ptions/ routes in the vicinity of the

staging site and wider Project Area

• No management/ mitigation

measures identified Negligible Disruptions to marine recreational use in Kendall Bay

• Notice to Mariners
• Vessel speeds

Negligible

Summary of ecological assessment

Methodology

• 1. Baseline studies and data
• Review of literature including relevant database searches
• Habitat assessment including two field surveys to identify threatened

species, communities, benthic organisms, populations and their habitat

• 2. Impact Assessment
• Assessment of Impacts on flora and fauna in accordance with NSW

and Federal legislation and NSW Planning Instruments

• 3. Mitigation Measures
• Appropriate mitigation/ management measures devised to manage

potential impacts

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Options for mangrove stand in Remediation Area A

Summary of ecological assessment

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Option 1 Option 2 Option 3 Retain all or part of the mangrove stand Remove the sediment while maintaining the mangroves in situ Remove the mangroves and contaminated sediment from remediation Area A Finding: Remediation cannot occur without removing/ damaging the existing mangrove

• colony. No practical solution is available to allow retention of mangroves and

remediation of sediment on Area A. Option 3 is the only practical approach. Mitigation measures:

• Develop a mangrove management plan to prepare area for biodiversity re-

establishment and management of progress of mangrove re-colonisation

• Monitor progress to employ adaptive measures if necessary

Summary of ecological assessment

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Impact Mitigation Measures Significance of Impact with Mitigation

Impacts on threatened or protected fauna species from loss of preferred habitat

• Marine habitat monitoring

plan Negligible Physical loss of mangroves habitat

• Mangrove management plan
• Re-establishment of

mangroves Negligible Altered water quality as a result of the re- suspension of sediments during dredging

• Water quality management

plan Negligible Water quality impacts from accidental hydrocarbon spills from plant, equipment or pipeline failure

• Use of silt curtains.
• Visual inspection of pipeline

Negligible Impacts to the seabed and marine ecology during removal of contaminated sediments

• None identified

Positive

Q and A Session

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Thank you and close

Next Steps

• Display and presentation materials from the session will be

uploaded to the website for broader interest

• Await outcome of Jemena’s State Significant Development

application as well as updated Environmental Assessment Requirements (EARs) (expected Q3 2014)

• Subject to the above, EIS to be lodged Q3 2014
• Public Exhibition Q4 2014/ Q1 2015

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