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Planning Act 2008 The Infrastructure Planning (Applications: Prescribed Forms and Procedure) Regulations 2009
COPYRIGHT: The concepts and information contained in this document are the property of Sinclair Knight Merz (Europe) Ltd. Use or copying of this document in whole or in part without the written permission of Sinclair Knight Merz (Europe) Ltd constitutes an infringement of copyright.
LIMITATION: This report has been prepared on behalf of and for the exclusive use of Sinclair Knight Merz (Europe) Ltd’s Client, and is subject to and issued in connection with the provisions of the agreement between Sinclair Knight Merz (Europe) Ltd and its Client. Sinclair Knight Merz (Europe) Ltd accepts no liability or responsibility whatsoever for or in respect of any use of or reliance upon this report by any third party.
PROPOSED GAS FIRED COMBINED CYCLE GAS TURBINE PLANT AT WREXHAM INDUSTRIAL PARK - PHASE I DESK STUDY
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Contents
1. Introduction 1
2. Site Profile 2
2.1. Site Location 2
2.2. Site Description 3
2.3. Proposed Development 3
2.4. Adjacent Site Use 4
2.5. Site Drainage 4
2.6. Site Regulatory and Environmental Data 4
2.7. Site History 5
2.8. Summary of Previous Investigations 6
2.9. Potential Contamination Sources 6
3. Environmental Setting 8
3.1. Geology 8
3.2. Coal Mining 8
3.3. Hydrogeology 8
3.4. Hydrology 9
3.5. Ecology 9
3.6. Summary of Site Sensitivity 9
4. Conceptual Model and Risk Assessment 11
4.1. Introduction 11
4.2. Conceptual Model 11
4.3. Qualitative Risk Assessment 12
5. Summary of Risks 16
5.1. Environmental Risk Assessment 16
6. Conclusions and Recommendations 17
6.1. Conclusions 17
6.2. Recommendations 18
7. References 19
Appendix A Landmark report 20
Appendix B Figures 21
Appendix C Site Photographs 22
PROPOSED GAS FIRED COMBINED CYCLE GAS TURBINE PLANT AT WREXHAM INDUSTRIAL PARK - PHASE I DESK STUDY
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Document history and status
Revision Date issued Reviewed by Approved by Date approved Revision type
1 26/10/2010 Chris Stewart
Distribution of copies
Revision Copy no Quantity Issued to
Printed: 7 May 2015
Last saved: 7 May 2015 04:08 PM
File name: Document1
Author: Graham Duffield
Project manager: Larraine Wilde
Name of organisation: SKM Enviros
Name of project: Wrexham CCGT
Name of document: Phase 1 Desk Study
Document version: V1
Project number: JS30101
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The site is surrounded by agricultural fields to the north and east. The western boundary is
bordered by Bryn Lane beyond which lies Wrexham Industrial Park. The southern
boundary of the site is bordered by a ditch / stream beyond which lies open fields. The
nearest residential properties are located approximately 100m east of the site (Park
Cottage).
2.5. Site Drainage
As the site is currently undeveloped, no dedicated drainage is present. A ditch / stream is
situated along the southern boundary of the site flowing west to east.
2.6. Site Regulatory and Environmental Data
Information regarding potential hazards associated with environmental regulatory controls
is summarised in Table 2. This information is taken from the data provided by Landmark,
a copy of which is provided in Appendix 1.
Table 2 Regulatory Data
Data Source On/off site? Details Potential for Impact on-site?
On Site
Landfill Sites, Waste Management Facilities & Waste Transfer Sites
On site None listed at the study site. No
IPC authorisations and IPPC permits
On site None listed at the study site. No
Trade directory entries On site None listed at the study site. No
LAPPC On site None listed at the study site. No
Discharge consents On site None listed at the study site. No
Recorded pollution incidents to controlled waters
On site None listed at the study site. No
Off Site
Landfill Sites, Waste Management Facilities & Waste Transfer Sites
Off site Two licensed waste management facilities are located within 500m of the site. They are both licensed to Waste Recycling Group Ltd for material recycling and treatment located 350 to 400m south west of the site. However, no further details are available regarding waste types, tonnages etc.
Unlikely given distance from site
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Data Source On/off site? Details Potential for Impact on-site?
IPC authorisations and IPPC permits
Off site Five IPC authorisations are listed within 500m of the site relating to Owens Corning Fibreglass Ltd located 145m south west although all authorisations are all now listed as inactive.
Two IPPC permits are licensed within 500m of the site. The first relates to Kellogg’s for treatment of animals, vegetables and foods, and the combustion of fuel >50Mw. The second relates to glass fibre manufacture at Owens Corning Fibreglass Ltd. Both sites are listed as being located 148m south west of the study site.
Possibly, although management and environmental controls in place for site operations as part of permitting regime.
Trade directory entries Off site 92 trade directory entries are listed within 1km of the site – see Appendix 1 for details.
Possibly
LAPPC Off site No active licenses within 500m. No
Discharge consents Off site Fifteen licensed consents listed within 1km, the closest relates to sewage discharges into a tributary of the River Dee located 335m east of the site.
No
Recorded pollution incidents to controlled waters
Off site Nine incidents listed within 1km of the site, all listed a Category 3 (Minor).
No
IPC = Integrated Pollution Control; IPPC = Integrated Pollution Prevention & Control; LAPPC = Local Authority Pollution Prevention & Controls; APC = Air Pollution Control
2.7. Site History
The site history has been determined from a review of OS historical maps. The text below
describes significant historical activities on the site and surrounding area. The on-site
history focuses on the 1:2,500 scale maps, with the off-site history concentrating on the
1:10,560 scale maps. Both scale maps have been used in some instances to describe
relevant features. Table 3 indicates potential contaminative uses of the site and surrounding
land. The maps are included in Appendix 1.
2.7.1. On-site history
The earliest map dated 1873 showed the site as agricultural / open fields with a number of
small ponds in central areas and a footpath cutting through its eastern flank. A road was
observed to cut through the western portion of the site. No significant changes occur on
site from this time until the present day, although there is only now one pond on site.
2.7.2. Off-site history
The 1873 map shows the site was located to the north of Ridley with a number of small
farms and surface water ponds in the surrounding areas. No significant changes occur in
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Table 5 Sensitivity of Environmental Receptors in the Vicinity of the Site
Receptor Type Receptor(s) Sensitivity Reasoning
Groundwater Principal Aquifer (Sherwood Sandstone Group)
Moderate Site underlain by a Principal Aquifer with protection afforded from overlying low permeability boulder clay. Two abstractions from groundwater within 1km for farming and domestic use. Site not located within a groundwater protection zone.
Surface water Ditch / stream
Low
Ditch/stream running west to east adjacent to the southern boundary of the site which flows into the River Dee 2.5km east of the site. No abstractions from surface water within 1km of the site.
Ecological None identified
Very Low
No ecologically sensitive areas designated within 1km of the site.
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Table 6 Environmental Risk Assessment – Proposed Industrial/Commercial Land Use
Source Pollutant / Hazard
Receptors Pathways to Receptor
Associated Hazard [Potential severity]
Likelihood of Occurrence Potential Risk
Historic ponds (possibly backfilled)
[On site]
Various contaminants
Future Site Users
Direct contact, ingestion, inhalation
Effect on human health
[Medium]
Unlikely: No evidence of contamination observed during site walkover, and no historic evidence of backfilling of ponds. Majority of site will be covered with buildings and hardstanding mitigating the risk of exposure by human receptors to potential underlying contamination.
Low
Construction Workers
Direct contact, ingestion, inhalation
Effect on human health
[Medium]
Unlikely: No evidence of contamination observed during the site walkover, and no historic evidence of backfilling of ponds. Any risk posed to site workers through potential exposure to contaminated materials would be mitigated through the adoption of health and safety measures and wearing appropriate Personal Protective Equipment (PPE).
Low
Future buildings and services
Accumulation of gases in sub-floor voids and confined spaces
Effect on buildings and services
[Medium]
Unlikely: Backfilling of ponds not confirmed, and any migration of gases beneath building footprints will be impeded by the presence of low permeability Boulder Clay. The development will comprise buildings designed in accordance with current good practice including where appropriate, vapour/gas membranes and clean covers/ hardstanding.
Low
Wrexham Industrial Park
[100m to 1km south and west]
Various contaminants including heavy metals, hydrocarbons, acids, alkalis, asbestos, oils, solvents
Future Site Users
Direct contact, ingestion, inhalation
Effect on human health
[Medium]
Unlikely: No evidence of contamination observed during site walkover. Majority of site will be covered with buildings and hardstanding mitigating the risk of exposure by human receptors to potential underlying contamination.
Low
Construction Workers
Direct contact, ingestion, inhalation
Effect on human health
[Medium]
Unlikely: No evidence of contamination observed during the site walkover. Any risk posed to site workers through potential exposure to contaminated materials would be mitigated through the adoption of health and safety measures and wearing appropriate Personal Protective Equipment (PPE).
Low
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Downwards migration of contaminants via leaching into shallow groundwater
Pollution of groundwater
[Mild]
Unlikely: The sensitivity of groundwater has been assessed as low as the site is directly underlain by a Principal Aquifer but protection is afforded by ~50m of overlying Boulder Clay (indicated by data from BGS logs from boreholes in surrounding areas). The clay will significantly impede the vertical migration of potential contaminants into the underlying aquifer. Presence of contamination at the site not proven. The proposed development will predominantly comprise buildings and hardstanding, thus significantly reducing the infiltration of surface water into soils and subsequent leaching of contaminants.
Very Low
Controlled Waters (Ditch / stream)
Lateral migration of leachable contaminants in soils and contaminants in shallow groundwater
Pollution of surface water [Mild]
Low: Presence of contamination at site not proven. The proposed development will predominantly comprise buildings and hardstanding, thus significantly reducing the infiltration of surface water into soils and subsequent leaching of contaminants. Any potential contaminants entering the stream via direct site drainage or shallow groundwater flow will undergo significant natural attenuation before flowing into the River Dee (2km distant).
Very Low
Future Buildings and services
Direct contact Contamination of potable water supply pipes
[Medium]
Unlikely: Presence of contamination at site not proven. Presence of ~50m of Boulder Clay (indicated by data from BGS logs from surrounding areas) will impede the lateral migration of potential contaminants beneath the site. Any risks could be mitigated by the use of clean, inert backfill material in service corridors and the adoption of contaminant resistant pipe compounds in accordance with current good practice.
Low
Wrexham Royal Ordnance Factory
Explosives, pyrotechnics, munitions
Future Site Users
Direct contact, ingestion, inhalation
Effect on human health
[Medium]
Unlikely: No evidence of contamination observed during site walkover. Majority of site will be covered with buildings and hardstanding mitigating the risk of exposure by human receptors to potential underlying contamination.
Low
Construction Workers
Direct contact, ingestion, inhalation
Effect on human health
[Medium]
Unlikely: No evidence of contamination observed during the site walkover. Any risk posed to site workers through potential exposure to contaminated materials would be mitigated through the adoption of health and safety measures and wearing appropriate Personal Protective Equipment (PPE).
Low
PROPOSED GAS FIRED COMBINED CYCLE GAS TURBINE PLANT AT WREXHAM INDUSTRIAL PARK - PHASE I DESK STUDY
Downwards migration of contaminants via leaching into shallow groundwater
Pollution of groundwater
[Mild]
Unlikely: The sensitivity of groundwater has been assessed as low as the site is directly underlain by a Principal Aquifer but protection is afforded by ~50m of overlying Boulder Clay (indicated by data from BGS logs from boreholes in surrounding areas). The clay will significantly impede the vertical migration of potential contaminants into the underlying aquifer. Presence of contamination at the site not proven. The proposed development will predominantly comprise buildings and hardstanding, thus significantly reducing the infiltration of surface water into soils and subsequent leaching of contaminants.
Very Low
Controlled Waters (Ditch / stream)
Lateral migration of leachable contaminants in soils and contaminants in shallow groundwater
Pollution of surface water [Mild]
Low: Presence of contamination at site not proven. The proposed development will predominantly comprise buildings and hardstanding, thus significantly reducing the infiltration of surface water into soils and subsequent leaching of contaminants. Any potential contaminants entering the stream via direct site drainage or shallow groundwater flow will undergo significant natural attenuation before flowing into the River Dee (2km distant).
Very Low
Future Buildings and services
Direct contact Contamination of potable water supply pipes
[Medium]
Unlikely: Presence of contamination at site not proven. Presence of ~50m of Boulder Clay (indicated by data from BGS logs from surrounding areas) will impede the lateral migration of potential contaminants beneath the site. Any risks could be mitigated by the use of clean, inert backfill material in service corridors and the adoption of contaminant resistant pipe compounds in accordance with current good practice.
Low
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