FORMER COALITE, BOLSOVER

Transcription

SITE REMEDIATION AND PHASING STRATEGY
Former Coalite, Bolsover - July 2014
CONTENTS
PAGES
Remediation Outline Technical Proposal
3 - 17
Appendix 1 - Sizes of Treatment Areas
18 - 24
Appendix 2 - Phase 2 Remediation (Zone A Odourous materials)
25 - 29
Appendix 3 – Phase 3 Remediation (Zone B & C materials)
30 - 35
Appendix 4 – Phase 4 Isolated Hotspots Remediation & Carpet coal strip
36 - 39
Appendix 5 – Phase 5 Remediation (Remainder of Zone A / Treament area)
40 - 44
Appendix 6 – Remediation cost flow, Outline Programme and Land Release Strategy
45 - 48
REMEDIATION OUTLINE TECHNICAL PROPOSAL
Site at Former Coalite premises, Bolsover
1.
Preamble
1.1
Proposed remediation methods
SKM Enviros provided a summary of the viable / unviable remediation options for the Former Coalite site
(Table 69 in Report JL30743). SKM suggested that five technologies were theoretically viable for treatment,
as well as using the traditional methods of off-site disposal and capping as a form of source removal /
pathway removal. The five technologies were: 1. Selective excavation and sorting; 2. Ex situ aerated
bioremediation; 3. Ex situ turned bioremediation; 4. Stabilisation and 5. In situ thermal desorption.
We propose to use three of these five technologies as well as using the traditional methods of off-site disposal
and capping as part of a treatment train for the site. We propose to use selective excavation and sorting, ex
situ 'turned' bioremediation and a potential for a limited amount of ex situ aerated bioremediation.
We have discounted in situ thermal desorption based on concerns around cost and validation certainty of the
approach. In situ work usually leads to a large uncertainty as to whether pockets of materials remain
untreated that may rebound and may cause issues at a later date. By removing the soils and treating them
ex situ, we are able to substantially increase confidence that full treatment of source materials has been
carried out; all remedial excavations are validated against site specific remediation criteria and treated soils
are sampled and validated against site specific re-use criteria prior to being backfilled.
Our approach uses best practice by reducing the volumes for treatment and disposal by selectively excavating
and screening, by treating soils using sustainable and natural bioremediation processes, as well as further
mitigating risks by capping the remediated soil materials.
1.2
Summarised scope of works
The works will be undertaken in a planned and sequential manner to ensure all areas are thoroughly
investigated and to remove the potential for any contaminated materials not identified during the site
investigation phase to remain untreated.
To aid the identification of contaminated soil source area, the site will be excavated using the concentration
maps produced as part of the remediation planning exercise as a guide. These maps were produced using
Environment Agency approved methodologies and adhering to the principles of CLR11. Obviously, we are
aware that individual hotspots of contamination exist outside of the main remediation zones depicted on
these maps and will ensure that these areas are also chased out during a targeted excavation programme.
The remedial criteria derived by the risk assessment will be used as a screening criteria of materials that may
require treatment / require further investigation / are suitable for direct re-use. Our provisional approach is to
use the most conservative (combined risk and odour) criteria for materials that may require treatment /
require further investigation, the risk based target for validating excavations and assessing the materials
suitability for direct reuse or following treatment, and an qualitative assessment of odour for potential
disposition location – i.e. at depth, under public open space, under hard-standing (e.g. car parks) or beneath
transport infrastructure (e.g. roads, roundabout). The screening criteria are detailed in the attached table,
with ‘risk only’ criteria for validating excavations and assessing the materials suitability for reuse to be
formally agreed with the Local Authority and Environment Agency as part of our submission of the proposed
Implementation Plan and deployment form.
As well as using chemical analysis to classify materials that may require treatment / require further
investigation, both surface and subsurface materials will be subjected to visual and olfactory identification of
contamination during the excavation works to allow the segregation into stockpiles for reuse and treatment.
In most cases such materials will be removed and taken to the ‘quarantine area’ and ‘treatment area’. These
materials will undergo formal assessment (via laboratory tests) so an appropriate treatment / disposal route
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can be selected.
If any of the soil material comprises fibrous asbestos containing materials it will be left in-situ until a method
of disposal / treatment for the affected soils has been agreed.
The volume of material to be treated / disposed can be greatly reduced with suitable on-site segregation of
excavated materials into those that comply with and those that exceed the established site specific screening
criteria. The sides and base of remedial excavations will be validated using a grid system and by taking
representative samples for laboratory analysis (The number of samples will vary according to excavation size,
but a minimum of one sample from each face and two bases samples will be taken from every remedial
excavation).
There may be some materials that are unable to be treated and will require off-site disposal (e.g. asbestos
containing materials). This technique provides a rapid solution to the problem but is not considered to be a
sustainable solution for the entire volume of contaminated soils due to the likely high number of lorry
movements and commercial cost. There may be sustainability gains to be made if there is a centralised
treatment facility nearby that was able to treat the materials.
The main remediation process will involve the excavation of the contaminated material and its placement and
treatment using biocells. The excavated materials would be screened prior to being placed onto a treatment
area comprising a remnant area of concrete slab (a trough) and other concrete bays surrounded by
impermeable bunds. The remediation uses naturally occurring bacterial population to metabolise the
contaminants within the soil by optimising bacterial growth conditions (e.g. temperature, oxygen content and
moisture). The method works most efficiently in the drier and warmer summer months.
Some of the contaminants may not respond as readily to passive biocell treatment and may require more
intensive turning. It is possible that this more aggressive treatment may involve short term increases in
odours (i.e. during turning periods) that would need to be managed (See Section 6.3).
2
Remediation Strategy Introduction
The following sections describe, in outline, the methodologies that will be adopted in carrying out successful
completion of Zones A, B and C earthworks and remediation.
In summary, the preparation and remedial works will primarily comprise of the following tasks:
• Site clearance of vegetation and any remaining above ground walls and infrastructure (tanks etc);
• Controlled excavation, segregation, screening and bioremediation of hydrocarbon impacted soils;
• Controlled excavation, segregation, screening and treatment of phenol impacted soils;
• Controlled removal of concrete slabs, tarmac, foundations and redundant service corridors;
• A site wide programme of excavation, screening and testing soils whilst grubbing out and removing
below ground obstructions (foundations etc.) to ensure removal of hotspots of contamination;
• Replacement / compaction of suitable soils based on preliminary cut and fill balance;
• Provision of verification report by an independent consultant
Following agreement to our scope of works, we would submit our detailed remedial design and deployment
form to the EA for the treatment works.
The works will provisionally use the railway line cutting for moving between the zones on either side of
Buttermilk Lane, therefore apart from the initial mobilisation of plant, the potential to disrupt the flow of
traffic to surrounding areas is negated.
Health, Safety and Environmental Management Plans will be completed as well as Method Statements, Risk
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Assessments, COSHH Assessments, Site Waste Management and Traffic Management Plans associated with
the works and incorporated into the Construction Phase Health and Safety Plan (CHASP).
The specific performance requirements of the preparation and remedial works, along with their scope are
described fully in the following sections.
3
Preparatory and Remedial Works
Part of the work will be to undertake delineation work in the substantial areas of existing concrete slabs and
foundations (associated with previous building footprints in Zones A) to ascertain the nature and condition of
un-investigated soils and allow the removal of any isolated hotspots of contamination. This will take place in
Phase 4 of our proposed works. The nature of this work is explained more fully in subsequent sections.
In general, remedial works will be undertaken to:
i. Remove above ground and underground storage tanks;
ii. Remove and treat groundwater encountered during the excavation process;
iii. Recover free-phase hydrocarbons where encountered;
iv. Excavate, segregate and screen contaminated and uncontaminated soils into different
stockpiles associated with different treatment / reuse processes;
v. Treat hydrocarbon and phenol contamination in soils to remove source of odour and
contamination (as far as practicable);
vi. Where possible, reuse treated soils at depths (below 1m) to ensure human health dermal,
ingestion or inhalation pathways are broken. Non-odourous material (site won or imported) will
be used in the top 1m to reduce odour effects;
vii.
Demonstrate that risks to the HH and CW receptors have been managed through a
rigorous validation of soils and groundwater;
viii.
“Handover the site” on completion, with a verification report from an independent consultant.
A Materials Management Plan (MMP) shall be established and adopted for the project. All
earthworks/remediation activities shall be recorded and tracked such that a full auditable trail exists for
materials excavated, processed, imported, reengineered and deposited. This will include as dug and
deposition information, accompanied by material type, approximate volume, chemical characteristics,
geotechnical characteristics etc., indicating certainty of use. We will use a ‘Qualified person’ under the
Definition of Waste: Development Industry Code of Practice (DoW CoP) for the works. This initiative improves
the sustainability and cost effectiveness of redeveloping land by enabling the legitimate reuse of excavated
materials on-site with a significantly reduced regulatory burden.
The following methodologies set out the site preparation and remedial work that will be undertaken to reduce
hydrocarbon and phenol contamination, undertake the site wide over dig and removal of obstructions, and
backfill and compaction of the site.
3.1
Site clearance of vegetation and remaining above ground infrastructure and some
concrete slabs (Phase 1 - Demolition prior to below ground remediation)
The site clearance will involve the demolition of the remaining above ground infrastructure. Low walls and
concrete slabs will be cleared using a 20 tonne excavator or similar. Above ground tanks will be demolished
and cleared using suitable demolition and cutting equipment. This site clearance work will also involve the
clearing and removal of the existing trees, shrubbery and scrub to ground level within the current works
areas (Zones A through C).
The shrubbery and scrub areas will be cleared using a 20 tonne excavator or similar, which will scrape the
existing surface of the works area to a depth of no more than 100mm. This organic material will be stockpiled
within the works area in a designated lay down/ stockpile area for shredding and recycling into the
bioremediation process (as appropriate). The trees will be cut down to an appropriate size and this material
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could also be chipped and recycled or used in the bioremediation process (as appropriate).
Deleterious materials that are unable to be reused or recycled will be taken to a landfill site for disposal.
3.2
Controlled excavation, segregation, screening and bioremediation of impacted soils
A bioremediation treatment area and quarantine area will be constructed using existing hard-standing in Zone
A (Area 5) prior to contaminated soil excavation works commencing. This will comprise several level areas
and platforms with low permeability bases to prevent any leaching of contaminants into the underlying
ground – See Appendix 1 for details of the treatment zones.
The same remediation processes are undertaken for the majority of the impacted soils, therefore to avoid
needless repetition they are not repeated for each individual remediation phase within this report. Drawings
containing site remediation areas, expected made ground thickness, volumes of soils to be remediated, and
soil concentration maps are provided in the Appendices to aid the ‘visualisation’ of the remediation phases.
• Phase 2 remediation drawings and volume data of Zone A are contained in Appendix 2;
• Phase 3 remediation drawings and volume data of Zone B are contained in Appendix 3;
• Phase 4 remediation drawings of isolated hotspots in Zones A through C (and stripping of carpet
coal) are contained in Appendix 4;
• Phase 5 remediation drawings and volume data of remainder of Zone A / Removal of treatment area
are contained in Appendix 5.
It is proposed that the excavation, segregation and screening procedures are undertaken in stages to allow
for careful excavation and sorting of the material, as follows:
• Excavate carefully considering potential for perched water ingress / excavation stability;
•
Continue excavation to a depth approximately 0.5m beneath the pre-start static water level or when
the impacted smear layer has been removed, whichever is sooner;
•
Screen material leaving the excavation using a portable PID (Photo Ionisation Detector) for volatile
hydrocarbons (This will act as an on-site indicator of TPH contamination);
•
Transport excavated soil showing visual or olfactory evidence of gross hydrocarbon / phenol
contamination to the quarantine area;
•
Transport excavated soil showing visual or olfactory evidence of moderate hydrocarbon / phenol
contamination to the treatment area;
•
Remove any free product floating in the hydrocarbon hotspot excavations with a mobile mop
skimmer system or overpump grossly contaminated water / free product mixture from the
contaminated zone excavations. Dependant on encountered volumes, water would either be passed
through a ‘pump & treat’ water treatment system consisting of oil water separator, sand filter and
granular activated carbon, or directly into a storage tank for removal from site via a tanker to a
licensed facility;
Once material is segregated into the correct contamination profiles, the soils will screened (with
oversized fraction being removed) and nutrients added to aid soil homogenisation / kick start the
bioremediation process. The soils will then be formed into labelled bioremediation cells to allow
staged treatment and backfill at the site;
Further baseline monitoring of soils positioned on the treatment area will be carried out (as
appropriate) to confirm commensurate concentrations within the soil mass of each biocell;
•
•
•
•
Once contaminated soils have been placed in the treatment area, impermeable liners will be placed
over them to prevent ingress of precipitation, minimise fugitive odours and help keep the soils at an
optimal temperature for bioremediation;
The liner will drain off the soil cells, thus precipitation will not come into contact with contaminated
soils (and as such no leachate will be generated). Therefore, there will be no need to provide
containment or treatment for run-off from the treatment area;
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•
The soil cells will be turned regularly (using an excavator with allu bucket attachment, as
appropriate) and nutrients will be added (as required) to encourage the reduction in hydrocarbon
concentrations. The soils in the treatment areas will be monitored (as appropriate) to check
optimum performance using gas analysers, photo ionisation detectors, and thermocouples;
•
The thermocouple can detect small increases in temperature inside the biocell, which is indicative of
increases in biological activity. Monitoring moisture content and concentrations in extracted air of
parameters including carbon dioxide (CO2), oxygen (O2) and methane (CH4) concentrations can
also be used to confirm increased microbiological activity. An increase in CO2 and corresponding
decrease in O2, indicates biological degradation of the contaminants;
Soil samples for speciated hydrocarbon and phenol analyses will nominally be removed at bi-monthly
intervals to assess progress of the treatment process. Each round of the bioremediation process is
expected to take in the region of 3-4 months (depending on time of year). When the material
becomes suitable for use, using laboratory testing as confirmation, the treated soil will be considered
suitable for placement beneath the site.
•
3.3.1
Controlled removal of concrete slabs, tarmac, foundations and redundant service
corridors (Part of Phase 4 earthworks associated with remediation shown in Appendix 4)
Once Phase 3 has been completed and major site risks associated with Zones A & B removed, the existing
concrete slabs, tarmac, foundations and redundant service corridors can be removed. This will be undertaken
in stages to prevent disruption to any other operational remediation activities.
Crushing of hardcore materials on site achieves maximum site recycling potential by providing materials for
piling mats or haul roads for rebuild phases. In addition, it minimises traffic movements within the industrial
estate and surrounding areas.
All concrete slabs, hardstanding, foundations and tarmac will be broken up, removed, segregated, then taken
to a central processing area for crushing, before stockpiling for later re-use by the developer (subject to
satisfactory chemical analysis). These processes are described below:
A hydraulic 360 excavator fitted with bucket and breaker attachments will remove all associated floor slabs,
foundations and service corridors / culverts. The breaker attachment will be used to weaken the floor /
foundation / culvert structures by breaking them into sectional parts to make removal easier. All floor slabs
shall be removed by the excavator with bucket attachment and transported to the crushing area, where
materials will be segregated into several concrete and tarmac stockpiles.
Crushing operations will be carried out within controlled areas and all access will be monitored by the crusher
operator and banksman. The concrete crushing plant (which will be sited on firm, level ground in an agreed
location away from the site boundary) will have clear access routes for loading and unloading. The concrete,
brickwork and demolition arisings will be stockpiled adjacent to the crusher, and all steel reinforcement will
be separated from the concrete by an excavator with a pulverising attachment. Once the material is crushed,
it will be graded to type 6F2, and temporarily stored as separate concrete and tarmac stockpiles to facilitate
later re-use by the developer (Storage location to be agreed).
3.3.2
Underground Storage Tank removal (Part of Phase 4 earthworks associated with
remediation shown in Appendix 4)
The surrounding area will be levelled so that the excavator has a safe platform to work off. The excavator will
remove the concrete surfacing and any soils above the tanks to expose the tank top. The tanks are likely to
be extremely aged and possibly corroded. The tanks may be filled with sand or lean mix concrete, but there
is a potential for voids at the end of each tank so there is a potential for explosive atmosphere so the
surrounding atmosphere will be tested using a gas monitor / LEL meter. Depending on condition of the tanks,
the tanks will either be removed intact by the excavator with any runoff water or free product/sludge being
captured and treated / disposed of; or they could be cut / opened in situ with an excavator bucket (or a
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hydraulic breaker to ‘cold cut’ the tank) with any contents being removed and treated. The tanks would then
be broken up and sent for recycling off-site.
3.3.3
Site wide excavation, screening and testing of soils to depth beneath existing ground
level or finished ground level (Part of Phase 4 earthworks associated with remediation
shown in Appendix 4)
As previously described, we propose a staged excavation, segregation and screening procedure to allow for
careful sorting of the site material into chemically and geotechnically appropriate for the site. These stages
are as follows:
• Carefully excavate remainder of the site (i.e. areas not tackled by works in Section 3.2), bearing in mind
possible perched water or previously unidentified contamination;
• Continue excavation to a depth beneath existing ground level or finished ground level, whichever is
lower;
•
•
•
•
Assess all material based on soil type / likely contamination during this process;
Transport excavated soil that exhibits visual or olfactory evidence of contamination into designated and
labelled stockpiles for confirmatory chemical testing;
If suitable for direct reuse, the soils will be screened to remove oversized fraction (>150mm) and to aid
soil homogenisation. The soils will then be backfilled in a staged and carefully managed backfill process;
If the material requires treatment, then it will undergo the processes in Section 3.2 until validation testing
has confirmed that the soil is considered suitable for placement beneath the site.
3.3.4
Excavation and removal from site of ‘carpet coal’ in Area C (Part of Phase 4 earthworks
associated with remediation shown in Appendix 4)
There is a layer of carpet coal covering the majority of Area C, that although not part of any remediation
driven exercise will need to be excavated and removed prior to site redevelopment. We propose a shallow
excavation (surface strip), segregation and screening procedure to allow for careful sorting of the carpet coal
material. Once segregated the material will be removed from site for reuse or recycling depending on the
calorific value of the coal.
3.4
Replacement / compaction of soils (Occurring throughout Phases 2 to 5)
Once the area has been excavated and geotechnical validation samples / tests have been carried out on
the base, backfilling works will commence in layers of 300mm thickness. If waters remain are present
within the deeper excavations, site derived crushed materials may be used for backfill as these will not
absorb the waters and cause an unstable base for material above it.
All backfilled soils will be compacted using a Bomag or equivalent roller The specification of the
compaction plant to be used will be assessed during a field compaction trial in order to allow the site
specific method (i.e. optimal soil consistency, depth of layers, and number of passes) to be decided.
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4
Provision of verification report by an independent consultant
The Remediation Validation report will confirm the remediation carried out and provide details of ground
conditions encountered, chemical and geotechnical verification testing results, any waste transfer notes,
locations of reuse of treated contaminated soils within the site. It will contain (as a minimum):
• Brief factual description of ‘The Works’
• Weather record detailing temperature, air pressure and precipitation
• The testing and validation protocols used*
• Detailed method statements for earthworks, remediation and disposal
• All in situ test records and results
• All laboratory test records and results
• A site plan showing surveyed locations of areas of encountered contamination;
• Locations of any services encountered;
• Locations of tanks removed
• A site plan showing the surveyed locations of all obstructions remaining (e.g. pile locations) and
including the location of any plugged and severed services;
• An as-built record of the earthworks undertaken including disposition of the various material types
placed on site;
• Details of all remediation investigation, testing, monitoring and validation carried out;
• A record of asbestos encountered (if any), its location and disposal / treatment method;
• Volumes of contaminated material excavated/treated
• Volumes of free phase product / contaminated water pumped from the ground
• Volume and nature of hazardous waste (Asbestos, free product, etc.) removed from site with relevant
waste transfer notes
• Volumes of unsuitable / deleterious material removed from site to an off-site disposal facility with
relevant waste transfer notes
• Any volumes of material imported to site (with supporting geotechnical and chemical testing results,
as appropriate)
• Record of any third party complaints received and action undertaken;
• Record of any pollution incidents or near misses and actions taken;
• An as-constructed survey of post-remediation ground levels across the whole of the site
* The sides and base of remedial excavations will be validated using a grid system and by taking representative samples for
laboratory analysis (The number of samples will vary according to excavation size, but a minimum of one sample from each face
and two bases samples will be taken from every remedial excavation).
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5
Residual risk mitigation
5.1
Direct Contact mitigation
Mitigation of direct contact risks during the remediation phase and any following construction phases will be
the use of appropriate PPE, gloves etc, and the provision and use of appropriate welfare facilities before any
work break.
Depending on the odour following treatment, the areas not proposed to be covered by hard-standing may
need to be protected by an appropriate thickness of clean cover material.
5.2
Indoor Vapour Inhalation Mitigation
The development platform following remediation will take into account the ground gas conditions present
following the remediation of the site. These works will need to be carried out to address any explosion or
asphyxiation risks from the potential sources of gases and vapours.
5.3
Controlled Waters Mitigation
Potential risks to Controlled Waters will be removed following the treatment of the contaminated soil
materials. In addition, free product and contaminated perched groundwater shall be removed as far as
practicable by the remediation works.
In most cases, the treated material will not be placed at or near the finished surface of the development so
erosion caused by surface water run-off is unlikely to transport any residual contamination towards the River.
5.4
Property and Services Mitigation
The mitigation of risks associated with attack on below ground structures by potentially aggressive ground
conditions will be the recommendation for use of appropriate construction materials, such as sulphate
resistant concrete, where ground conditions require its use. In addition, the use of clean bedding material
and/or selection of appropriate pipe material is something that is routinely used on brownfield sites when
laying drinking water supply pipes. These mitigation steps will be the responsibility of the site developer.
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6
Remediation Implementation & Environmental Monitoring
6.1
Environmental Permit
All of the treatment works on this site will be carried out in accordance with the standard rules of the Mobile
Plant Treatment Permit held by DSM Demolition Ltd.
6.2
Mitigating dust impact during the remediation
The main bulk of the remediation works will have a low dust impact. The majority of the soils on the site will
not create a large volume of dust during excavation and subsequent handling. In addition, the moisture
content will need to be carefully controlled for the success of the bioremediation process.
The processing and stockpiling of recovered concrete and brick into processed aggregates will have a medium
impact. The control measures will be detailed in the permit for the crushing and screening equipment. Dust
suppression will be carried out by wetting with water (by spraying mists), where required. To reduce the
potential for spreading contamination the water used is potable water.
6.3
Mitigating odour impact during the remediation
The main bulk of the remediation works will have a moderate odour impact. The majority of the contaminated
soils on the site have the potential to create odours during excavation and subsequent handling. The tasks
involving processing, stockpiling and turning of soils have the highest potential to create an odour impact. The
generation of odours from these tasks will be mitigated by using a combination of control measures on site
(e.g. odour suppression techniques, ensuring work is planned with optimal wind direction / synoptic weather
conditions etc.).
6.4
Mitigating odour impact following the remediation
In addition to the risk based target for validating excavations and assessing the materials suitability for direct
reuse or following treatment, an qualitative assessment of odour will be made to inform the materials
potential disposition location – i.e. at depth, under public open space, under hard-standing (e.g. car parks) or
beneath transport infrastructure (e.g. roads, roundabout). Non-odourous material (site won or imported) will
be used in the top 1m to reduce odour effects.
6.5
Mitigating vibration impact during the remediation
The only significant vibration source identified in the works will be the lifting and breaking of the concrete
slabs and other hard structures above / below the ground. These are considered as low potential and will be
kept to a minimum by using modern methods of working. Wherever possible concrete slabs will be lifted from
an open edge to break them rather than breaking holes in them with a vibrating hammer.
6.6
Mitigating noise impact during the remediation
The principle sources of noise identified from the remediation works are as listed below:
•
Lifting of the existing ground slabs, foundations, demolition of structures (Medium)
•
Excavation and placement of the site soils in treatment area (Low)
•
Transportation of soil materials around the site (Low)
•
Removal of groundwater and any encountered free product (Low)
•
Treatment of contaminated soils (turning etc) (Low)
•
Crushing and screening of hard arisings (Medium)
•
Generators for welfare facilities (Low)
•
Plant and equipment movements to and from site (Low)
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6.7
Environmental Monitoring
Environmental monitoring will be undertaken on the site to measure the impacts the works have on the
environment. Monitoring will be carried out to determine background levels, normal levels produced by the
works and as part of investigations into incidents or complaints. Site record sheets will contain acceptable
monitored levels and actions to be taken in the event of an exceedance.
6.7.1
Dust Monitoring
In-situ dust monitoring will be carried out at specific locations on the site boundary. Dust will also be
appraised on the site boundary at the same locations twice daily by visual inspection. No visible dust
should be apparent at the site boundary. The operations with the highest potential to create dust will be
the lifting of the slabs and foundations, the crushing and screening of the same. Such operations have the
potential to create predominantly nuisance dust. The method of monitoring will adhere to the protocols in
“Monitoring of particulate matter in ambient air around waste facilities” (Environment Agency Technical
Guidance Document (Monitoring) M17).
6.7.2
Odour Monitoring
Odour monitoring will be carried out at specific locations on the site boundary. The monitoring and scoring
will be in accordance with The Environment Agency document H4 Odour Management (Sniff Testing). The
scoring rate given in this document shall be used as given below:
0 = no non natural odours
1 = very faint odour
2 = faint odour
3 = distinct odour – ACTION NEEDED
4 = strong odour – ACTION NEEDED
5 = very strong odour – ACTION NEEDED
6 = extremely strong odour – ACTION NEEDED
Given the nature of the contamination present the ‘action needed’ to mitigate the odours could be to
increase odour suppression control measures, reduce volumes of materials being disturbed to a minimum,
or stop work entirely.
6.7.3
Vibration monitoring
Vibration monitoring will be carried out at specific locations on the site boundary. The monitoring will
nominally be carried out using calibrated Vibroc V901 Seismograph. Only one set of readings are planned
to be carried out as background readings as no works have been identified with a potential to cause
concern to surrounding land users.
The vibration monitoring points will be as close as possible to the noise monitoring points on a suitable
hard surface. The minimum monitoring period at each location would be 30 minutes. The protocol will
adhere to the BS 5228 : 2009 Code of Practice for Noise and Vibration Control on Construction and Open
Sites – Part 2 Vibration.
6.7.4
Noise Monitoring
Noise monitoring will be carried out at specific locations on the site boundary. The locations will be
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selected in proximity to sensitive receptors. The monitoring will be carried out using a calibrated noise
meter. Background monitoring will be carried out at 1.5 metres above ground and 3.0 metres away from
any reflective surface. The minimum monitoring period will be 15 minutes and during this period the
instrument will be fixed to a tripod frame. A set of background readings will be taken as well as a set of
readings when works commence, and as they progress.
The only medium impact activities will be the breaking of ground slabs and the crushing operations. The
protocol will adhere to the BS 5228 : 2009 Code of Practice for Noise and Vibration Control on Construction
and Open Sites –Part 1 Noise.
Should noise levels be raised as a concern by adjacent land users the operations involved will be
investigated to determine if they can be undertaken in a manner that produces lower noise levels off-site.
If this is not possible, a strategy will be adopted to control the noise impact by carrying out the works at
agreed times.
6.8
Mitigating human health risks during the remediation
All of the processes described above will mitigate human health risks during the remediation process. The
main risks to human health will be for the construction workers on site but the control measures in place
(i.e. suitable PPE) will ensure that these risks are minimised. Additional human health risks may exist for
trespassers onto the site (open excavations, trip hazards etc) but these will also be managed during the
remediation and demolition works by placing suitable fencing and adequate health and safety and warning
signage around the site. All of which will be fully detailed in our deployment data and approved by the
Environment Agency before starting the works.
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7
Remediation cost flow, Outline programme and Land release strategy
The information in Appendix 6 provides outline cost and time viability information for the project. The
remediation cost flow indicates the costs expended to date and then a time line of the build up of costs
throughout the remediation phases. In order to maintain the momentum of the remediation and cashflow, Area
D (Residential area) would need to be released following the remediation of the most odourous materials in
Zone A. The remaining ‘low odour’ contaminated areas would be remediated (as any other brownfield
redevelopment site) throughout the remainder of the proposed programme alongside the secondary build
phase of the residential housing.
12
St Francis Group
July 2014
Combined Human Health Assessment Criteria, Residential and Commercial / Industrial Including
Odours, Coalite, Bolsover
Aliphatic >5–6
Aliphatic >6-8
Aliphatic >8–10
Aliphatic >10-12
Aliphatic >12-16
Aliphatic >16-21
Aromatic >7–8
Aromatic >8–10
Aromatic >10–12
Aromatic >12–16
Aromatic >16-21
Aliphatic >21-44
Benzene
Toluene
Ethylbenzene
Total Xylene
1,2 Dichloroethane
1,1,1 Trichloroethane
1,1,2,2 Tetrachloroethane
1,1,1,2 Tetrachloroethane
Tetrachloroethene
Trichloroethene
Vinyl Chloride
Phenol
Benzo(a)anthracene
Benzo(a)pyrene
Benzo(b)fluoranthene
Benzo(k)fluoranthene
Chrysene
Dibenz(ah)anthracene
Indeno(1,2,3,cd)pyrene
Naphthalene
Carbazole
Dibenzofuran
Chlorophenol
Propylbenzene
1,3,5-Trimethylbenzene
1,2,4-Trimethylbenzene
Sec-Butylbenzene
4-Isopropyltoluene
n-Butylbenzene
Other organics
2-chlorophenol
4-chlorophenol
4-nitrophenol
2,6-Dinitrotoluene
Nitrobenzene
chlorobenzene
pentachlorophenol
2-Methylphenol (o Cresol)
2,4-Dimethylphenol
pyridine
quinoline
aniline
Dioxins and furans
OCDD
OCDF
1,2,3,7,8-PeCDF
2,3,4,7,8-PeCDF
2,3,7,8-TCDD
2,3,7,8-TCDF
Combined
Commercial
Warehouse (HHRA
and odours)
13000
34000
8400
460000
220000
NC
10200
13000
82000
424000
NC
NC
11
0.0062
50000
17000
1.3
1700
710
310
430
30
0.11
1100
3410
683
6160
7380
4230
820
5680
91
18400
28400
12800
82200
82200
82200
12800
82200
Combined Residential
gardens (HHRA and
odours)
comment on reasons for change
57
156
35
1,713
929
not volatile therefore free phase can
176,791
be present
42
33
144
480
1,038
be present
176,791
be present
5.9
0.001
131
72
0.01
8.82
2.33
1.50
1.91
29
0.0005
63
6.62
0.94
9.18
9.55
8.03
0.95
9
1.6
158
37
5
59
144
144
144
33
-33
4.4
793000
4.3
36
NC
NC
61400
19
8.7
145000
12
32
26
280
1200
908000
483000
780
78
18
100
Data removed. All toxicity data is
withdrawn.
3.57
220 new tox data
100
15
140 new tox data
360
2.2
0.04 new tox data
2.14
67,538
20,556
6.41
0.64
0.13
0.60
Combined Human Health Assessment Criteria, Residential and Commercial / Industrial Including
Odours, Coalite, Bolsover
Combined
Commercial
Warehouse (HHRA
and odours)
TCDF, 2,3,7,8- (I TEQ)
1,2-Dichlorobenzene
1,2,4-Trichlorobenzene
1,3-Dichlorobenzene
1,4-Dichlorobenzene
2,4-Dinitrotoluene
2,6-Dinitrotoluene
Hexachlorobenzene
Methyl tert-butyl ether
Chloromethane
Chloroethane
Trans 1,2 Dichloroethene
Cis 1,2 Dichloroethene
1,1-Dichloroethene
1,1-dichloroethane
1,1,2 Trichloroethane
Hexachloroethane
1,2,3-Trichlorobenzene
2,4-Dichlorophenol
2,4-Dimethylphenol
2-Chloronaphthalene
tert butylbenzene
Styrene
Bromobenzene
Isopropylbenzene
1-Methylnaphthalene
2-Methylnaphthalene
n butylbenzene
Propylbenzene
Acenaphthene
Acenaphthylene
Isopropyltoluene
2,4,6-Trichlorophenol
2,3,4,6-Tetrachlorophenol
Diethyl Phthalate
Dimethyl phthalate
Di-n-butyl phthalate
Di-n-octyl phthalate
Bis (2-ethylhexyl) phthalate
Carbon Tetrachloride
Trichloromethane
Dichloromethane
Carbon disulphide
Hexachloro-1,3-butadiene
1,2 Dichloroethane
2-Chloronaphthalene
4-Methylphenol
3-Methylphenol
Bromodichloromethane
Bromoform
Xylene, oXylene, mXylene, pButyl benzyl phthalate
All units mg/kg
5850
620
88
12600
486000
61400
750
15900
1.7
1760
51
31
59
570
230
59
290
11000
1780000
1090
10500
260
3760
NR
NR
NR
11200
1190000
1220000
NR
Combined Residential
gardens (HHRA and
odours)
comment on reasons for change
27
3
Note inhalation derived from oral
exposure.
Note inhalation derived from oral
54
exposure)
3.24
3.57
0.94
64.07
0.01
8
0.24
0.14
0.29
2.77
0.95
0.34
1.74
10
118
6
0.49
17
1.41
33
15
32
59
468
389
0.00
note inhalation derived from oral
exposure and changes to using
790
15
USEPA rather than EA value for Koc
(not included here)
note inhalation derived from oral
exposure and changes to using
29
1270000
USEPA rather than EA value for Koc
(not included here)
753000
251
NR
0.00
367000
31
437000000
2,811
28300000
612
15
0.05
240
0.99
490
1.23
31
0.14
NR
0.35
1.3
0.01
1090
6.28
5050000
178
7330000
179
4.6
0.02
1910
4.76
20
2
20
2
20
2
408920469
3,350
Yellow cells refer to use of lower threshold odour values.
APPENDIX 1
SOIL TREATMENT ZONES FOR BIOREMEDIATION
This Drawing must not be copied or reproduced without
written permission or consent from St Francis Group Ltd
BUNDED AREA
Only figured Dimensions to be taken from this drawing, do not
scale.
The Author of this drawing does not accept any liability for
details or information provided by outside organisations.
Boundaries are shown for identification purposed only, all
boundaries are to be confirmed by the legal owner.
Key
THE TROUGH
Treatment Zones
BAYS
A
25/06/14 Bolsover Treatment Zones
JP
REV
DATE
DRN
DESCRIPTION
CHKD
Site Ownership
Bolsover Land Ltd
Address
Former Coalite, Buttermilk Lane, Bolsover,
South Yorkshire, S44 6QL
Drawing
BOLSOVER – Treatment Zones
April Barns, Redditch Road, Ullenhall, Henley-in-Arden,
Warwickshire, B95 5NY
[email protected]
Scale
Sheet Size
N/A
A4
Date
Drawn
25/06/14
Job No
P161
Size in Area
N/A
Checked
JP
Drawing No
007
Rev
A
Location and Size of “The Trough” Remediation Zone
Location and Size of “The Bunded Area” Remediation Zone
Location and Size of “Bays” Remediation Zone
Location and Size of “Hardstanding Adjacent Old Garage” Remediation Zone
Appendix 1
27/06/2014
Bolsover
SIZE OF TREATMENT AREAS
Trough
10m wide x 200m long =
Assume 4m of width allowed for windrow =
Assume 2m high and 2m width at top of windrow
Volume = (4 + 2) x (2 x 0.5) x 200 =
2,000 m²
800 m²
1,200 m³ a
Bunded Area
540 m²
432 m²
See Promap image with area =
Assume nett usable area of bunded are is 80%
Assume height of material could be piled at 2.5m
Volume therefore =
1080 m³ b
Bays
See Promap image - total area of all 4 bays
Assume nett usuable are of bays is 80%
2080 m²
1664 m²
Assume neight of material could be piled at 2.5m
Volume therefore
4160 m³ c
Hardstanding Adjacent Old Garage
See Promap image - total area
Assume nett usuable area is 80 %
3740 m²
2992 m²
Assume height of material could be piled at 2.5m
Volume therefore
7480 m³
NB: Although the hardstanding adjacent the Old Garage was considered as a treatment zone it has been
discarded. It was felt all treatment zones should be contained within one area of the site.
TOTAL VOLUME CAPACITY = a + b + c
13,920 m³
APPENDIX 2
REMEDIATION OF MOST ODOUROUS MATERIALS IN AREA A
(PHASE 2)
BUNDED AREA
scale.
Key
THE TROUGH
Treatment Areas
Contamination Area
BAYS
PHASE 2
CONTAMINATION
AREA
A
25/06/14 Bolsover Phase 2 Remediation
JP
REV
DATE
DRN
DESCRIPTION
CHKD
Site Ownership
Bolsover Land Ltd
Address
Drawing
BOLSOVER – Phase 2 Remediation Area
[email protected]
Scale
Sheet Size
N/A
A4
Date
Drawn
25/06/14
Job No
P161
Size in Area
N/A
Checked
JP
Drawing No
001
Rev
A
Phase 2 Contamination Area Extract from Drawing 7269d
DEPTH TO NATURAL
GROUND = 2.0m
DEPTH TO NATURAL
GROUND = 1.4m
DEPTH TO NATURAL
GROUND = 1.8m
Phase 2 - Contaminated area bounded by Railway, River Doe Lea and Buttermilk Lane
See Promap image identifying size of remediation area
See extract from Stafsurv drawing 7269d
Average Distance between current levels and natural ground =
Total volume of ground between existing levels and natural ground =
Deductions
Assume 80% of area is covered with hardstanding / floor slabs / foundations
Assume avergae depth of hardstandings = 300mm
Volume of arisings from hardstanidngs to be lifted and crushed elsewhere
Total Volume of material requiring remediation =
16,710 m²
1.6 m
26,736 m³
13,368 m²
4,010 m³
22,726 m³
APPENDIX 3
REMEDIATION OF CONTAMINATED MATERIALS FROM CENTRE
OF ZONE B & CORNER OF ZONE C (PHASE 3)
BUNDED AREA
scale.
Key
THE TROUGH
Treatment Areas
Contamination Area
Remediated Areas
BAYS
PHASE 2
CONTAMINATION
AREA
REMEDIATED
REV
DATE
DESCRIPTION
DRN
CHKD
Site Ownership
A
Bolsover Land Ltd
JP
Address
Drawing
[email protected]
PHASE 3 CONTAMINATION AREA
Scale
Sheet Size
N/A
A4
Date
Drawn
25/06/14
Job No
P161
Size in Area
N/A
Checked
JP
Drawing No
001
Rev
A
DEPTH TO NATURAL
GROUND = 1.8m
DEPTH TO NATURAL
GROUND = 2.0m
AVERAGE DEPTH TO NATURAL
GROUND = 1.6m
DEPTH TO NATURAL
GROUND = 1.2m
DEPTH TO NATURAL
GROUND = 1.0m
DEPTH TO NATURAL
GROUND = 2.0m
Phase 3 - Contaminated area split by River Doe Lea
Average Distance between current levels and natural ground =
Total volume of ground between existing levels and natural ground =
Deductions
Assume avergae depth of hardstandings = 300mm
Volume of arisings from hardstanidngs to be lifted and crushed elsewhere
Total Volume of material requiring remediation =
29,650 m²
1.6 m
47,440 m³
2,965 m²
890 m³
46,551 m³
APPENDIX 4
ISOLATED "HOTSPOT" REMEDIATION & CARPET COAL STRIP (PHASE 4)
scale.
Key
Treatment Areas
Contamination Area
PHASE 4
CONTAMINATION
AREA (ISOLATED
"HOTSPOTS" ONLY"
BUNDED AREA
Remediated Zone
A
REV
DATE
DESCRIPTION
JP
DRN
CHKD
Site Ownership
Bolsover Land Ltd
Address
Drawing
BOLSOVER – Phase 4 Remediation Area,
isolated hotspots
THE TROUGH
PHASE 2
CONTAMINATION
AREA
REMEDIATED
[email protected]
Scale
BAYS
Sheet Size
N/A
A3
Date
Drawn
25/06/14
Job No
P161
Size in Area
N/A
Checked
JP
Drawing No
004
Rev
A
This Drawing must not be copied or reproduced without written
permission or consent from St Francis Group Ltd
scale.
Key
Treatment Areas
Contamination Area
Remediated Zones
PHASE 3
CONTAMINATION
AREA
REMEDIATED
Carpet Strip Zone
A
25/06/14 Bolsover Phase 4 Carpet Strip
JP
REV
DATE
DRN
DESCRIPTION
CHKD
Site Ownership
Bolsover Land Ltd
Address
PHASE 4
CARPET STRIP
Former Coalite, Buttermilk Lane, Bolsover, South
Yorkshire, S44 6QL
Drawing
BOLSOVER – Phase 4 Carpet Strip Area
[email protected]
Scale
Sheet Size
N/A
A4
Date
Drawn
25/06/14
Size in Area
N/A
Checked
JP
Job No
Drawing No
P161
004.1
Rev
A
Phase 4 - Carpet Strip Area, South East of Buttermilk Lane
See promap image confirming size of strip area
68,940 m²
Depth of carpet strip at
Therefore volume of material to be removed from site =
0.45 m³
31,023 m³
APPENDIX 5
REMEDIATION OF REMAINING MATERIAL IN ZONE A & REMOVAL
OF TREATMENT AREA (PHASE 5)
BUNDED AREA
scale.
PHASE 4 CONTAMINATION
AREA REMEDIATED
Key
PHASE 5
Treatment Areas
CONTAMINATION
Contamination Area
AREA
Remediated Zones
PHASE 2
CONTAMINATION
AREA REMEDIATED
BAYS
A
REV
DATE
DESCRIPTION
JP
DRN
CHKD
Site Ownership
THE TROUGH
Bolsover Land Ltd
Address
Drawing
[email protected]
PHASE 3 CONTAMINATION
AREA REMEDIATED
PHASE 4
CARPET STRIP
COMPLETE
Scale
Sheet Size
N/A
A4
Date
Drawn
25/06/14
Job No
P161
Size in Area
N/A
Checked
JP
Drawing No
003
Rev
A
DEPTH TO NATURAL
GROUND = 1.2m
DEPTH TO NATURAL
GROUND = 0.8m
DEPTH TO NATURAL
GROUND = 1.6m
Phase 5 - Remainder of contamination bounded by Railway, River Doe Lea and Buttermilk Lane
Average depth between current levels and natural ground =
14,440 m²
1.2 m
Total Volume of ground between existing levels and natural ground =
17,328 m³
Deductions
Assume average depth of hardstandings
Volume of arisings from hardstandings to be lifted and crushed elsewhere
11,552 m²
0.3 m
3,466 m³
Total Volume of material requiring remediation
13,862 m³
APPENDIX 6
REMEDIATION COST FLOW, OUTLINE PROGRAMME AND LAND
RELEASE STRATEGY
scale.
Key
Zone A
Zones B
Zone C
Zone D
A
25/06/14 Zones
JP
REV
DATE
DRN
DESCRIPTION
CHKD
Site Ownership
Bolsover Land Ltd
Address
former Coalite, Buttermilk Lane, Bolsover,
Drawing
BOLSOVER – Zones
[email protected]
N
Scale
Sheet Size
N/A
A4
Date
Drawn
25/06/14
Job No
P161
Size in Area
N/A
Checked
JP
Drawing No
007
Rev
A
Bolsover Land
Remediation Cost Flow
Cost to date
Remediation cost
Above ground chemicals (Cost to date
Phase 1 (Demo plot A)
Phase 2 (Remediation of part Plot A)
Release of Land for housing Plot D
Phase 3,4 and 5
Plot A
Plot B
Plot C
£
£
£
1,800.00
400.00
3,000.00
£
£
£
£
4,000.00
2,058.00
2,736.00
13,994.00
£
£
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
33
33
33
33
33
200
37
200
33
200
33
200
33
200
33
200
33
200
33
200
200
200
200
Cost to Come
Month
16
17
Check
18
19
200
200
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
1,800.00
1,800.00
33
1833
33
1866
33
1899
33
1932
233
2165
237
2402
233
2635
233
2868
233
3101
233
3334
233
3567
233
3800
200
4000
200
4200
200
4400
200
200
4600
200
200
4800
144
344
5144
144
344
5488
400
3000
144
144
5632
66
144
210
5842
100
166
144
410
6252
100
166
144
410
6662
100
166
144
410
7072
100
166
144
410
7482
150
166
144
460
7942
275
166
144
585
8527
375
166
144
685
9212
375
375
375
375
375
375
375
175
166
166
166
166
166
144
144
144
144
144
144
144
144
685
685
685
685
685
519
519
319
9897 10582 11267 11952 12637 13156 13675 13994
4000
2058
2736
13994
scale.
Key
Part Zone A – Months 5 to 19
Zones D Release – Month 19
Zone A, B and C – Months 18 to 36
A
25/06/14 Programme and Land Release
REV
DATE
DESCRIPTION
JP
DRN
CHKD
Site Ownership
Bolsover Land Ltd
Address
former Coalite, Buttermilk Lane, Bolsover,
Drawing
BOLSOVER – Overall Programme and Land
Release Strategy
[email protected]
N
Scale
Sheet Size
N/A
A3
Date
Drawn
25/06/14
Job No
P161
Size in Area
N/A
Checked
JP
Drawing No
006
Rev
A
2

FORMER COALITE, BOLSOVER

Transcription

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