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Mark ShorrockCEO, Shire Oak Energy Ltd, Shire Oak Quarries Ltd, Tidal Lagoon Power Ltd
Swansea Bay Tidal Lagoon
155,000 homes powered: c.90% of Swansea Bay’s
domestic use/ c.11% of Wales’ domestic use
Transportation of Rock Armour from Dean Quarry
1 barge=9000 tonnes=300 lorry loads
Dean Quarry Mineral Rights
Red=Quarry footprint, today and in future
Blue=Accompanying mineral rights
Kurt Larson Managing Director, Shire Oak Quarries Ltd
Background
• BSc Mining Engineering
• Director, Foster Yeoman (UK/USA independent) 1987-2006
• Principal, Result Consulting (International) 2006-present
• Over 30 years of experience in "coastal" quarry / rock armour operations in UK and Scandinavia
Dean Quarry Existing Consent NR/09/00504/ROMPS
UK and International PerspectiveGlensanda – Super Quarry
700 million tonnes (mt) of granite in reserves
Production capacity in excess of 7 million tonnes per annum (mtpa)
Other Quarries in UK
Torr Works Somerset: 200 mt, 5 mtpa
Whatley, Somerset: 200 mt, 3 mtpa
Mount sorrel, Leicestershire: 200 mt, 4mtpa
Cliffe Hill Leicestershire. 200Mt, 4 mtpa
Bardon Hill, Leicestershire, 200mt, 4 mtpa
Dean Quarry Extraction
Dean Quarry consented reserves 6.3 million tonnes
5 million tonnes of rock is needed for Tidal Lagoon Swansea Bay
Ambition is for all the large rock armour to come from Dean Quarry - approx. 2.5 million tonnes
Blasting Once established, our intention is to carry out
blasting once or twice a week at a regular time
The time duration of the actual blast is less than 1.5 seconds
Specific methods of blasting to produce rock armour uses less explosive than in conventional quarrying
The danger zone will be within the quarry limits and last for a period of 30 minutes
Walkers on the Coastal Path will be asked to wait in safe public waiting areas on both sides of the quarry
Every effort will be made to publicise proposed quarry blasting times e.g. South West Coastal Path Association and online
Properties within 500m of the quarry will be monitored
Dust
In accordance with the current consent, best practicable means shall be employed for controlling dust emissions
Mitigation
Provision of efficient water spray bowser
Dust collection equipment on drilling rigs
Appropriate storage material
Temporary suspension of activities in poor meteorological conditions
Extraction Methodology
Following blasting the rock is sorted into grades for the lagoon breakwater structure
Haulage to stockpiles three grades above 1 tonne
Material less than 1 tonne and above 50 kg is processed in intermediate sizes
Material less than 50kg is crushed into ‘quarry run’ for the core of the breakwater
Transportation to Swansea Bay
Current consent outlines 24/7 loading
All trucks will be weighed prior to loading
Barge loading limit of 9,000 tonnes
Roll on roll off operation
Loading rate of 1,000 tonnes per hour
Loading time per barge approx 10 hours
Average 2-3 barges leaving Dean Quarry each week (20-30 hours loading per week)
Working with the community
14
Community Liaison
• We propose to establish a Community Liaison Group, attended by representatives of all local stakeholder groups
Communication of Blasting
• SW Coastal Path Association• Home owners• Safe public waiting areas
Community Benefits
• We need your input• Cornish Community Foundation• Funds linked to levels of extraction
We expect to create between 40 and 50 jobs
Quarry manager, foreman, shift supervisors, surveying, site accountant/ship agent, engineers, administration, financial manager, general labour, plant operations, dumper operations, truck operations, trammel and grizzly operators
Where possible, jobs will be offered to applicants with a Cornish postcode
First round interviews have been held - 12
Local Jobs
155
Ton Van Der Plas Senior Project Engineer, Tidal Lagoon Power Ltd
Why Dean Quarry? Planning consent until 2035
Recently operational quarry
Gabbro is suitable for use as an armour stone
Sufficient resource for more than one lagoon
Opportunity for a coastal quarry
A sustainable and long term solution for extraction of rock armour for future lagoons programmes
The Project
Factors that have informed the design:
The ability to deliver the amount of rock needed within the construction timetable of the Swansea Bay Tidal Lagoon
Existing jetty is not in a fit state of repair to be used
Ability to load at all states of the tide
Ability to load more than one barge at a time
Sensitivity of the marine environment and the necessity to avoid dredging
Protection from adverse weather conditions
Safe working conditions
Retaining public right of way and safety
Selected Design of The Project (14th Design Iteration)
Protection from most adverse weather conditions
Linkspan bridges to reduce jetty length and enable 24/7 loading
No dredging required
Footbridges to ensure the safety of walkers
Rock infrastructure will be sourced from quarry
Key Facts
Length of breakwater:535 metres
Volume of rock armour for jetties and breakwater: 89,000 tonnes
Volume of aggregate for jetties and breakwater: 335,000 tonnes
Sections of Jetties and Breakwater
Linkspanbridges
Gravity based dolphin piles and walkways
Footbridges
Need to be high enough to provide clearance to a loaded truck (6.2m to the underside)
Lighting At times loading will take
place during the night
Requirement for lighting for safe working practises
The lighting design ensures No upwards light
pollution
No excessive light spill from any luminaires installed
Classification also takes into account the effects of artificial lighting on wildlife such as bats, and the marine environment
Dean Quarry, Coastal processes assessment
Bill Cooper
30th January 2014
27
Content
Technical approach
Evidence base
Baseline understanding
Assessment of change
Summary
28
Technical approach
Coastal processes assessment undertaken by ABP Marine
Environmental Research Ltd
Specialist consultancy with over 50 years of experience
ABPmer deliver coastal process assessments for a range of
development types and scales around the UK, including;
marinas, jetties, ports, offshore wind farms, tidal lagoons, etc.
ABPmer led the in-depth review of evidence supporting the
recommended Marine Conservation Zones (MB0016), for
Defra.
29
Technical approach
Technical approach delivered according to relevant guidance
National Policy Statement for Energy (EN-1) from
Department for Communities and Local Government
Marine Conservation Zone advice note from Natural
England and Joint Nature Conservation Council
Approach described in scoping and screening report
Evidence based + analytical assessment + expert views
Drawing from stakeholder comments
30
Evidence base
Evidence base is the combination of data, information and
technical understanding, including new local survey data;
Metocean survey Waves, water levels and flows
Geophysical survey Seabed levels and textures
Benthic survey For sediment sampling and particle size analysis
31
Baseline understanding
Study considers Dean Quarry in the context of the wider
coastal setting (regional scale) to help understand the detail of
the local area. E.g.
Exposure of coastline to waves and tides
Local influences from headlands
Study area inclusive of The Manacles Marine Conservation
Zone
32
Overview of siteWider area views
33
Overview of site
Wind data from Culdrose
Local area views
34
Overview of site
The Manacles
Local area views
Reproduced from data obtained
from Channel Coastal
Observatory
© CCO 2015
35
Overview of site
Coarse sands
Shallow rocks extending
headland influence
Shallow rock platform
Local area views
36
Overview of site
Coarse sands
Shallow rocks extending
headland influence
Shallow rock platform
Interpreted map of
seabed type
Yellow = sandy
Grey = rocky
37
Overview of site
Low levels of suspended sediment
Summer
<1 mg/l
38
Overview of site
Low levels of suspended sediment
Winter
2 to 4 mg/l
39
Overview of site
waves
backscatter
water levels
and flows
40
Baseline understanding
Summary of baseline:
Clear coastal waters
Rocky seabed with coarse sands and gravels
Typically, moderate tidal flows which do not move coarse
sediments and limit suspended sediments
Limited supply of new sediments to area
Headlands shelter most waves, but easterly aspect still
exposed to long fetches
Large (and infrequent) easterly waves can stir local sediments
Seabed and coastline (beaches) respond to large waves
41
Assessment of change
Consideration of change relative to baseline during for the
following phases of the development:
Construction
Operation
Decommissioning
Baseline will also show change in the future, irrespective of any
development, and in line with climate change influences
42
Assessment of change
Construction
Short-term disturbances – maximum 16 weeks of marine works
Concern that material will be released into the water column
and disturbed from the seabed, leading to sediment plumes
Screening will mitigate fines from Gabbro quarry run removing
material less than 20 mm (equivalent to coarse gravel)
Natural sediments coarse so any disturbance will be short-lived
and material will quickly re-settle to seabed
Should fines in sediment be disturbed then they are limited to
being carried by a distance of around 126 m in axis of flow
43
Assessment of change
Operation
The breakwater will modify local flows and provide additional
sheltering of the coast and beaches
Baseline flows already complicated by headlands and rocky
shoals, some local flow diversions expected and some calmer
areas created
Silting up of calmer areas unlikely as there is no sediments in
the water column to settle out
No change in water levels to change flood risk
44
Assessment of change
Decommissioning (2035)
Various options for decommissioning
Leave in situ
Part removal (breakwater remains)
Full removal
Removal activities create similar levels of disturbance as
construction
45
Summary
Local area can be described as a coastal cell bounded
between Manacle Point and Lowland Point
Waves are the main process influencing the coast and
sediment movements
Breakwater will have an additive effect on existing flow patterns
and a local sheltering effect to waves
Sediment plumes from the site not considered to be significant
in any way, sources of sediment minimised, material generally
coarse and flow mechanism too weak to transport
No change in flood risk profile locally or further afield
Thank you for your attention
Bill Cooper
Dr Marc Hubble; Dr Rafael Pérez-Dominguez; Sheryl Davies
30th January 2015
Dean Quarry Project: Marine Ecology Assessment
APEM project experience
• Poole Harbour Masterplan development EIA
• Pembroke Dock underwater noise assessment
• Mersey Estuary Tidal Scheme Feasibility Study and EIA
• Severn Estuary Tidal Scheme SEA
• Hinkley Point C Nuclear New Build EIA
• Mersey Gateway EIA
• Lochboisdale Port and Harbour EIA
• Noss Head Directional Drilling Risk Assessment/CEMP
• Fylde Coast outfalls HRA
• Sandon Dock HRA
• BritNed cable landing benthic assessment
• Natural England species sensitivity assessments
• Marine Scotland Marine Protected Area assessments
• Natural England protected site Condition Assessments
Dean Quarry Development
• Construction of two new loading points- Two jetties- Two linkspan bridges- Dolphin piles
• Construction of breakwater- Main structure- Mooring piles
Marine Ecology Considerations
• Changes to species abundance and community composition
• Changes to habitat extent
• Species/habitats of conservation interest (protected by policy/legislation) e.g.
- Maerl- Pink sea fans- Basking shark and marine mammals
• Non-native invasive species
• The Manacles Marine Conservation Zone (MCZ)
• Species of commercial interest e.g. fisheries
Dean Quarry
Manacles Marine Conservation Zone
The Manacles MCZ
Manacles MCZ
• Designated November 2013- Broad-scale Habitats- Habitat and Species Features of
Conservation Importance (FOCI)
• MCZ managed by MMO and Cornwall IFCA
• Aim is healthy, sustainable and balanced use of marine resource
• MCZ assessment report completed
Features Area (km2)/No. of records
Conservation Objective
Broad-scale Habitat
Intertidal coarse sediment 0.03 Maintain
Moderate energy intertidal rock
0.04 Maintain
Subtidal sand 1 Maintain
Subtidal macrophyte dominated sediment
1 Recover
Moderate energy infralittoral rock
0.2 Maintain
Moderate energy circalittoral rock
0.2 Maintain
Habitat FOCI
Maerl beds 1 Recover
Species FOCI
Sea-fan anemone 3 Maintain
Spiny lobster 2 Recover
Stalked jellyfish 1 Maintain
Data for assessment
• Desk-based data review- Plankton- Fish and fisheries- Marine mammals- Basking shark
• Project-specific survey
- Intertidal species/habitat- Habitat mapping, quadrats, coring
- Subtidal species/habitat- Benthic grab sampling- Underwater video
Data for assessment
• Spatial coverage- within and outside footprint
• Design approved by MMO/NE
• Conducted July 2014
Marine ecology baseline
• Plankton- Wide range of taxa, potential for seasonal blooms
• Finfish and shellfish- Range of fish species with wider spawning/nursery
areas encompassing Dean Quarry site- Commercially fished species potentially present- Area protected by fishing byelaws- Potting crab and lobster- Recreational fishing (sea bass, mullet, pollack)
• Marine mammals- Most frequent: Harbour porpoise, common dolphin,
bottlenose dolphin (Cornwall inshore resident pod)
• Basking shark- Hotspot around Cornwall; peak numbers June/July
Marine ecology baseline
• Intertidal zone- Rocky boulders/cobbles: Sparse fauna (barnacles, algae)- Soft sediment: Barren, amphipod crustaceans, worms
- Two MCZ BSHs: ‘Intertidal coarse sediment’‘Moderate energy intertidal rock’
- No MCZ habitat/species FOCI recorded- No protected species recorded- Species recorded widespread in UK
• Subtidal zone- Mainly coarse sand and rock habitats- Sediments dominated by worms (mainly Mediomastus
fragilis). Rocky habitats mainly kelp, red seaweeds, sea urchins, starfish, sponges
- Two MCZ BSHs: ‘Moderate energy infralittoral rock’‘Subtidal macrophyte dominated sediment’
- No protected species recorded (incl. maerl, pink sea fans)- Species recorded widespread in UK
Environmental Assessment
what is the effect of this activity, at this place, at this time, carried out in this way, and how do we mitigate or compensate for any
effect identified?
Key aspects
• Pressure type & effect pathway• Sensitivity of ecological receptors
Resistance & resilience
• Exposure Intensity & duration
• Receptor importance (functional & structural)
Pressures & potential impacts
Construction I
• Physical disturbance/displacement- Movement of personnel and plant
- Levelling bottom substrate for dolphin piles- Rock placement for structures
Minor/No impact (plankton, benthos, finfish)
• Underwater noise and vibration- Rock and pile placement (gravity piles used)
- Vessel activityMinor/No impact (finfish, marine mammals)
• Collision risk with marine mammals- Vessel activity
Minor/No impact (marine mammals/basking shark)
Potential impacts
Construction II
• Changes to water quality- Re-suspension of potentially contaminated sediments
- Minor discharges from site dewatering and drainage only- Spillage of chemicals/contaminants
Embedded mitigation (discussed later)Minor/No impact (plankton, benthos, finfish)
• Lighting- Artificial lighting of jetty
Minor/No impact (plankton, finfish, marine mammals)
• Spread of INNS- Vessel activity
Embedded mitigation (discussed later)Minor impact (benthos)
Potential impacts
Potential impacts
Operation I
• Underwater noise and vibration;Collision risk to marine mammals;Lighting;Spread of INNS
Embedded mitigation for INNS
Minor/No impact for each (all receptors)
• Change in hydrodynamics and sediment transport regime- Presence of jetties and breakwater
Minor impact (benthos) (based on findings of Coastal
Processes study)
Potential impacts
Operation II
• Habitat loss/creation (structure presence)
- Net gain in extent of MCZ BSH feature ‘Moderate
energy intertidal rock’ (approx. 24% of feature in MCZ);- Net reduction in extent of MCZ BSH feature ‘Moderate
energy infralittoral rock’ (approx. 3.1% of feature in MCZ)
- Net area reduction is within the range of data resolution to
estimate habitat area for MCZ designation (UKSeaMap 2010);
- Potentially within range of natural variation across years
• Offsetting
- Use of quarry rock; variable size/shapes/angles/
imperfections- Artificial reef effect; enhancement of habitat/biodiversity- Ongoing monitoring at project site + long term colonisation
study to help inform MCZ managementNo significant risk of hindering MCZ conservation objectives
Potential impacts
Decommissioning
• Various options
• Assessment not yet possible
• Combination of construction and operationimpacts
• Assessment will be undertaken prior to decommissioning occurring which will review the long term monitoring findings and the integration of the structures within The Manacles MCZ
Potential impacts
Mitigation/offsetting
• Changes to water quality- Implementation of CEMP and OEMP- Best practice management- Training to workforce
• Spread of non-native species- Implementation of CEMP and OEMP- No discharging of ballast water at site- Biosecurity assessments for vessels- Other measures in Biosecurity Risk Assessment
• Reduction of MCZ BSH Moderate energy infralittoral rock - Use of quarry rock; habitat enhancement- Ongoing monitoring and colonisation study
Summary
• Species/habitats characterised- Desk-based study- Project-specific Surveys
• Potential impacts assessed- Available data- Experience of similar projects- Outputs of other workstreams- Professional judgement
• Embedded mitigation/offsetting- Required for some impacts
• Residual impacts (after mitigation/offsetting)- All impacts Minor significance/No impact
00:04:56
Dean Quarry Breakwater and Jetties ProjectNOISE IMPACT ASSESSMENT
Ed ClarkeClarke Saunders Associates
SELECTED RELEVANT EXPERIENCE
Corrib Gas Pipeline (major tunnelling project)airborne & underwater noise & vibration assessment, monitoring & controlCardiff Bay (canoe slalom course)underwater noise impactSwansea Bay (tidal lagoon)airborne & underwater noise & vibration impactsGolding Barn Quarry (South Downs National Park)noise & vibration assessmentsnumerous off-shore wind turbine projectsunderwater noise impact assessmentsWoodham Concrete Crushing (Surrey greenbelt)noise impact assessment & mitigation
Introduction
Issues•Construction
•Operation
•Combination
Conclusions
NOISE AND VIBRATION
00:04:40
Dean Quarry Breakwater and Jetties Project
• The operation of Dean Quarry is consented
• Breakwater and jetties require planning
• Both construction & operation (loading barges) at night is proposed
• The project needs to be considered on it ’s own merits, but also in combination with the operational quarry
• CSA was instructed to complete the noise and vibration impact assessments for the EIA
• The EIA involved detailed predictions of noise emissions during construction and operation
• Presentation provides an overview of the assessment and findings.
• Opportunity for questions after all the presentations.
INTRODUCTION
00:04:17
Dean Quarry Breakwater and Jetties Project
Construction• The breakwater and jetty construction is a relatively short term
project (approx. 4months), but disturbance needs to be minimised
• Work will need to be co-ordinated with tides, involving overnight working
Operation• Overnight working is also proposed for the material handling
operation at the jetties, exporting rock armour to the Tidal Lagoon Swansea Bay project
Combination• With operation of the quarry to occur while the jetty and
breakwater structures are built, construction and operation need to be considered in combination with quarrying
ISSUES
00:04:59
Dean Quarry Breakwater and Jetties Project
• Daytime noise levels are predicted to comply comfortably with the lowest threshold levels in BS5228
• At night, however, noise levels at the nearest receptors are predicted to be just above the lowest night -time threshold
CONSTRUCTION
00:04:56
N o i s e E m i s s i o n s P r e d i c t i o n s w i t h o u t m i t i ga t i o n
DEA N Q UA R RY: JET TY & B R EAKWATER CON STRUC TION
00:04:21
N o i s e E m i s s i o n s P r e d i c t i o n s w i t h m i t i ga t i o n ( u s e o f q u i e t e r p l a n t a n d n o v i b r ato r y r o l l e r a t n i g h t )
DEA N Q UA R RY: JET TY & B R EAKWATER CON STRUC TION
00:04:16
• The operational phase is longer and subject to stricter controls
• Predicted noise levels are lower than for construction
• Mitigation by noise management plan, and pre-loading of barges to minimise noise from loading rock armour
OPERATION
00:04:56
• RoMP consent is in place for the quarry
• Cumulative noise impact needs to be considered
• Quarry noise modelled on real noise data
• Comfortable compliance for quarrying within the RoMP limits
• Cumulative impact doesn’t compromise the jetty and breakwater noise assessment
COMBINATION
00:04:56
• Potential for noise impact is greatest at night
• Although audible at times, the impact can be managed to minimum threshold levels
• Further mitigation will be adopted
• Possibility to remove source of disturbance from tonal alarms
CONCLUSIONS
00:04:56
Open Floor for Q&A
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