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Phase II Environmental Assessment Foundry Point, Widnes Delta-Simons Project Number 18-0599.02

Environment | Health & Safety | Sustainability

Phase II Environmental Assessment Foundry Point, Widnes

Presented to Amazon UK Services Ltd Issued: June 2018

Delta-Simons Project No. 18-0599.02



Report Details

Client Amazon UK Services Ltd

Report Title Phase II Environmental Assessment

Site Address Foundry Point, Foundry Lane, Widnes, WA8 8TZ

Project No. 18-0599.02

Report Date June 2018

Delta-Simons Contact

Tom Horner ([email protected])

Quality Assurance

Issue No.

Status Issue Date

Comments Author Technical

Review Authorised

1 Final 28/06/2018 -

Gemma Tatton

Consultant

Tom Horner

Principal

Simon Clennell-Jones

Divisional Director

About us

Delta-Simons is a trusted, multidisciplinary environmental consultancy, focused on delivering the best possible project outcomes for customers.

Specialising in Environment, Health & Safety and Sustainability, Delta-Simons provide support and advice within the property development, asset management, corporate and industrial markets. Operating from nine locations - Lincoln, Birmingham, Dublin, Durham, Leeds, London, Manchester, Norwich and Nottingham - we employ over 70 environmental professionals, bringing experience from across the private consultancy and public sector markets.

Delta-Simons is proud to be a founder member of the Inogen® Environmental Alliance, enabling us to efficiently deliver customer projects worldwide by calling upon over 4,330 resources in our global network of consultants, each committed to providing superior EH&S and sustainability consulting expertise to our customers. Inogen Environmental Alliance offers its clients more consultants, with more services in more countries than the traditional multinational consultancy.



Executive Summary

Brief Delta-Simons Environmental Consultants Limited (‘Delta-Simons’) was instructed by Amazon UK Services Ltd (the ‘Client’) to undertake a Phase II Environmental Assessment for Foundry Point, Foundry Lane, Widnes, WA8 8TZ (hereafter referred to as the ‘Site’). The purpose of this assessment is to provide comfort and surety and to provide a ground investigation “benchmark” of the ground conditions beneath the Site, prior to the Client occupying the Site as a tenant.

The scope of works has been focussed on an initial assessment of ground gas and soil vapour issues.

Site Setting Historically the Site has been occupied by railway lines, a potential spoil heap, unspecified buildings, water bodies and raised ground. Chemical waste fill is known to have been present on the Site, but it is understood that this was removed and replaced by pulverised fuel ash (PFA) as part of a larger reclamation project in the area. The Site underwent re-development in 1994 into its current use, comprising a large vacant commercial / light industrial unit with associated car parking, yard and limited landscaped areas.

Ground Conditions

The ground investigation recorded a variable thickness of topsoil and Made Ground, which is in turn underlain by Tidal Flat Deposits. Monitoring of standpipes indicates that perched groundwater is within the Made Ground and Tidal Flat Deposits.

Land Contamination Assessment

Ground Gas

In accordance with BS8485 guidance, and using maximum recorded parameters and the calculated GSV’s, the Site has been classified as CS2. This is entirely due to the maximum carbon dioxide concentration having exceeded 5% v/v in DS05 which increases the CS classification from 1 to 2. In the event of a Site redevelopment ground gas protection measures would be recommended, however, given that elevated concentrations of carbon dioxide (>5% v/v) have only been encountered in DS05 in the yard area on two occasions (5.3% v/v and 6.4% v/v during the second and third monitoring visits respectively), and that elevated flow rates have not been encountered, it is considered that the risk to future Site users is low, especially given that the current building predominantly comprises a large open warehouse where accumulation of ground gas is very unlikely, and that DS05 is located approximately 90 m north of the area of the building utilised as office space.

Vapour intrusion

Analysis of soil vapour samples has identified elevated concentrations of benzene and petroleum hydrocarbons. However, given the magnitude of exceedances of Air Quality Criteria (AQC) are very limited with the maximum being only 10 times the applied AQC, it is considered that no further modelling is needed to conclude that the data is evidence that concentrations of the detected contaminants associated with the below ground sources will not result in indoor air concentrations that exceed the AQC based on the attenuation and dilution that will occur between the ground and indoor air, especially in the context of a warehouse use. On this basis, a risk is not considered to be present associated with vapour intrusion based on the data collected.

Recommendations Based on the findings of this assessment, it is considered that the risk to future end users from vapour / ground gas intrusion is low and therefore, it is not considered that further action is necessary prior to occupation of the Site.

This is intended as a summary only. Further detail and the limitations of the assessment are provided within the main body of the Report.



Table of Contents

1.0 INTRODUCTION ........................................................................................................................................................... 1

1.1 Appointment ............................................................................................................................................ 1 1.2 Context & Purpose ................................................................................................................................. 1 1.3 Scope of Works ...................................................................................................................................... 1 1.4 Existing Information ................................................................................................................................ 1 1.5 Limitations ............................................................................................................................................... 1

2.0 SITE DETAILS ............................................................................................................................................................... 2 2.1 Site Setting ............................................................................................................................................. 2

3.0 SITE INVESTIGATION ................................................................................................................................................. 5 3.1 Intrusive Investigation ............................................................................................................................. 5

3.1.1 Health & Safety Considerations ..................................................................................................... 5 3.2 Scope of Ground Investigation and Rationale ........................................................................................ 5

3.2.1 Scope ............................................................................................................................................. 5 3.2.2 Rationale ........................................................................................................................................ 5 3.2.3 Limitations ...................................................................................................................................... 5

3.3 Ground Investigation Factual Data ......................................................................................................... 5 3.4 Environmental Sampling, In-Situ Testing and Laboratory Analysis ....................................................... 6 3.5 Monitoring Programme ........................................................................................................................... 6 3.6 Soil Vapour Sampling ............................................................................................................................. 6

4.0 GROUND SUMMARY .................................................................................................................................................. 7 4.1 Introduction ............................................................................................................................................. 7 4.2 Ground Model ......................................................................................................................................... 7 4.3 Visual and Olfactory Evidence of Contamination - Soils ........................................................................ 7 4.4 Groundwater ........................................................................................................................................... 7

4.4.1 Strikes During Investigations ......................................................................................................... 7 4.4.2 Levels During Monitoring Programme ........................................................................................... 7

4.5 Visual and Olfactory Evidence of Contamination - Groundwater ........................................................... 8 4.6 Ground Gas Data ................................................................................................................................... 8

5.0 BULK GROUND GAS RISK ASSESSMENT ........................................................................................................... 10 5.1 Ground Gas Conceptual Site Model ..................................................................................................... 10

5.1.1 Sources ........................................................................................................................................ 10 5.1.2 Receptors ..................................................................................................................................... 10 5.1.3 Pathways ..................................................................................................................................... 10

5.2 Duration & Extent of Monitoring ............................................................................................................ 10 5.3 Ground Gas Risk Assessment ............................................................................................................. 11

5.3.1 Background .................................................................................................................................. 11 5.3.2 Gas Screening Value (GSV) ........................................................................................................ 11

5.4 Radon ................................................................................................................................................... 12 6.0 SOIL VAPOUR RISK ASSESSMENT ...................................................................................................................... 13

6.1 Overview ............................................................................................................................................... 13 6.2 Approach .............................................................................................................................................. 13 6.3 Results .................................................................................................................................................. 13 6.4 Assessment Criteria ............................................................................................................................. 13 6.5 Exceeding Samples .............................................................................................................................. 16 6.6 Discussion and Conclusion .................................................................................................................. 16

7.0 REVISED CONCEPTUAL SITE MODEL ................................................................................................................. 17 8.0 CONCLUSIONS & RECOMMENDATIONS ............................................................................................................. 18

8.1 Contamination Issues ........................................................................................................................... 18 8.2 Recommendations for Supplementary Work ........................................................................................ 18



Figures

Figure 1 Site Location Map

Figure 2 Site Layout and Approximate Intrusive Location Plan

Appendices

Appendix A Limitations

Appendix B Exploratory Hole Logs

Appendix C Ground Gas and Soil Vapour Laboratory Results

Appendix D Field Monitoring Data/Gas Monitoring Data

Phase II Environmental Assessment Foundry Point, Widnes Delta-Simons Project Number 18-0599.02 Page 1


1.0 Introduction

1.1 Appointment

Delta-Simons Environmental Consultants Limited (“Delta-Simons”) was instructed by Amazon UK Services Ltd (the “Client”) to prepare a Phase II Environmental Assessment for Foundry Point, Foundry Lane, Widnes, WA8 8TZ (the “Site”).

1.2 Context & Purpose

The aim of the investigation is to complete an environmental assessment in order to provide comfort and surety and to provide a ground investigation suitable “benchmark” of the ground conditions beneath the Site, prior to the Client occupying the Site as a tenant. The investigation will obtain information regarding ground conditions, from which risks to end-users can be assessed. The scope of works has been focussed on an initial assessment of ground gas and soil vapour issues.

1.3 Scope of Works

The scope of the investigation and layout of this report has been designed with consideration of CLR11 (Environment Agency, 2004a) and BS 10175: 2013 Investigation of Potentially Contaminated Sites – Code of Practice (BSI, 2011) and guidance on land contamination reports issued by the Environment Agency (EA) (2010a).

The project was carried out to an agreed brief as set out in Delta-Simons’ proposal dated 24th May 2018 (Ref. 18-0599.02). The scope of works is outlined in Section 3.2.1.

1.4 Existing Information

The Phase II Environmental Assessment was undertaken following the completion of Delta-Simons’ Phase I Environmental Assessment, Foundry Point, Foundry Lane, Widnes, WA8 8TZ (Ref. 18-0599.01), dated May 2018. This should be read in conjunction with this Report, although a summary of the information is provided.

1.5 Limitations

The assessment is limited to the issues agreed within the proposal for the works. Notes on limitations associated with this assessment are provided in Appendix A.



2.0 Site Details

2.1 Site Setting

A summary of the current Site status, environmental setting and key historical features is presented below. This has been summarised from the existing report listed in Section 1.4 which should be consulted for further detail.

Co-ordinates Centred approximately at National Grid Reference 349170, 384370.

Elevation 8 – 10 m AOD

Area 1.04 Ha

Site Location The Site is located to the north and west of Foundry Lane on the Halebank Industrial Estate to the south of Ditton and south-west of Widnes. A Site Location Map is included as Figure 1.

Current Site Use The Site is occupied by a steel framed metal clad warehouse unit which was constructed in 1994. The southern part of the warehouse unit comprises a two-storey office with the toilet and kitchen facilities. The building and offices are currently vacant and advertised ‘To Let’.

There is a brick substation located in the south-west corner of the Site (owned by Scottish Power) and a small metal clad storage unit (currently empty) located off the western elevation of the warehouse.

The Site entrance is from a roundabout to the south of the Site and there is a separate entrance to the yard located in the north-east of the Site. The south and west are covered by asphalt hardstanding, with the yard to the north being concrete. The land between the building and Foundry Lane is grassed. A Site Layout Plan is included as Figure 2.

Environmental Setting

From British Geological Survey (BGS) geological mapping data, the Site is indicated to be underlain by superficial deposits of Tidal Flat Deposits (Clay, Silt and Sand), over the bedrock of the Wilmslow Sandstone Formation.

Ground conditions identified at the Site during a previous geotechnical investigation (Sub Surface Limited, August 1992) comprised fill (stone fragments and fly ash over mudstone fragments, sand, ash, clayey silt, gravel, stone cobbles, and brick and concrete fragments) to between 2.3 m and 3.6 m below ground level (bgl) underlain by clayey silt, silty clay or clayey peat to between 6.0 m and 9.2 m bgl over clay to depths between 13.4 m and 13.6 m bgl. At three locations this was underlain by Sandstone to maximum proven depths of 14.5 m and 15.0 m bgl.

Blast furnace slag and gravel was identified at one location (between 1.9 m and 3.5 m bgl) along with ‘yellow chemical waste fill’ and ‘blue green chemical waste fill’ at one location between 1.0 m and 2.6 m bgl. The waste fill was observed to be mixed with ash, clinker, sand and clayey silt. It was also noted in the report that the fill was in the process of being excavated and removed as part of a wider land reclamation project, with the contaminated fill being replaced with fly ash-based fill and stone fill.

The Environment Agency (EA) classifies the superficial deposits (Tidal Flat Deposits) as a Secondary (Undifferentiated) Aquifer and the bedrock (Wilmslow Sandstone Formation) as a Principal Aquifer.

EA data indicates that the Site is not situated within a designated groundwater Source Protection Zone. According to the Envirocheck® Report, there are six licensed abstraction records from groundwater located within 500 m: two located 88 m south; two located 188 m south; and two 204 m south. The abstractions are utilised for general cooling and process water.



Standing groundwater levels were variable across the Site from the 1992 geotechnical investigation, ranging from 2.0 m and 11.2 m bgl.

The closest surface water feature is the Ditton Brook located 70 m to the east of the Site. The Stewards Brook and River Mersey are also located 395 m south-east and 500 m south respectively. According to the Envirocheck® Report, there are no licensed abstraction records from surface water located within 1 km of the Site.

The following controlled water / environmental receptors have been identified:

▲ The Ditton Brook; and

▲ The underlying Secondary (Undifferentiated) and Principal Aquifers.

Key Historical Features

Historically, the earliest reviewed mapping from 1893 demonstrated that several railway lines and a small unspecified building were present across the Site. Mapping also indicated that the land at the Site had been raised, with later mapping (1927) denoting an area of the land as a spoil heap. It also appeared that a water body was present in the east of the Site from the earliest available mapping which was later noted as a reservoir in 1937.

Further railway lines were added in the west of the Site by 1958, and it appeared that track roadways were also present across the Site at this time. It was noted that the potential spoil heap was no longer present by 1958.

By 1980, the railway lines were removed from the Site, and the majority of the Site appeared to have been largely levelled. The reservoir / pond in the east was infilled by 1990, and by 1994 the current unit was depicted. The Site remained unchanged until at least 2000. It is understood that the Site suffered a fire between 2002 and 2003 and following this, the northern-most area of the unit was dismantled.

Historical Google aerial photography and Street View indicated that an above ground tank (for HGV refuelling) was present in the western area of the yard from circa 2011 until at least 2015. Dark staining of the concrete floor in front of the tank is visible on the aerial photograph. The Site was shown as vacant from 2016 and the dark staining had been removed (as confirmed by the recent Site inspection).

Summary of Previous Reports

Delta-Simons reviewed the previous reports pertaining to the Site:

▲ Norwest Holst Soil Engineering Ltd. – Ground Investigation – Foundry Lane (ref: MNE/AKM/F5901), dated June 1984; and

▲ Sub Surface Limited – Ground Investigation (ref: 2118), dated August 1992.

The Norwest investigation was undertaken across the Site and wider area to the east (including the land on the opposite side of the Ditton Brook) to confirm the ground conditions for the redevelopment and reclamation of the area.

Varying amounts of ‘chemical waste’ were identified across the wider investigation area with large amounts identified in the east (off-Site on the opposite bank of Ditton Brook). The report notes that the origin of the waste was unknown; however, some of the material was derived from the product of soda ash and is known as Leblanc waste (galligu). Testing of the material identified relatively high concentrations of ammonia, chloride and sulphate.

Overall it was suggested that the unsuitable materials be removed and replaced with imported structural filling such as hardcore or a lightweight material such as PFA (pulverised fuel ash).

The Sub Surface report was undertaken to provide geotechnical recommendations for the development of the Site. At the time of the visit, the report noted that the upper zone of fill was being removed and replaced by fly ash.



Chemical waste fill was identified at one location (borehole 6); however, the report highlighted that the replacement of the materials had not yet been completed and it was considered that the identified chemical waste fill was still to be removed and replaced.

Ground gas monitoring was undertaken on one occasion. No significant carbon dioxide levels were identified; however, a methane reading of 2.5% was recorded within borehole 1 along with a reduced oxygen level (below 21%). Based on the initial reading it was recommended that specific gas protection measures may need to be incorporated into the development. In the first instance, it was recommended that further monitoring be undertaken.

A validation report for the materials removal was not identified.



3.0 Site Investigation

3.1 Intrusive Investigation

Delta-Simons carried out intrusive investigation work from 31st May to 1st June 2018 in order to provide comfort and surety and to provide a suitable “benchmark” of the ground conditions beneath the Site, prior to the Client taking up occupation.

The works were focussed on assessing ground gas and soil vapour issues.

3.1.1 Health & Safety Considerations

Service plans for the Site were not available from the Client. A utilities clearance specialist attended the Site on 31st May 2018 to trace services on and around the Site prior to excavation of exploratory hole locations.

An initial assessment of the Site identified a Low risk in relation to Unexploded Ordnance (UXO) and so no specific precautionary measures were required for the works.

Future Contractors should undertake their own assessment of UXO risk in relation to their specific proposed scope of works.

3.2 Scope of Ground Investigation and Rationale

3.2.1 Scope

The ground investigation comprised the following items:

▲ Initial service avoidance exercise;

▲ Supervision of all works by a Delta-Simons Geo-Environmental engineer. All intrusive locations were logged to BS5930:2015 Code of Practice for Site Investigations; and

▲ Drilling of eight dynamic sampler boreholes (DS01 to DS08) to a maximum depth of 3.0 m bgl.

▲ Ground gas and soil vapour sampling.

3.2.2 Rationale

Location Rationale

DS01. DS02, DS04, DS05, DS06, DS07, DS08 To provide a general coverage of the Site.

DS03 Targeting the location of a former above ground tank (AST).

3.2.3 Limitations

The soil vapour samples were obtained from the installed dynamic sampler boreholes as a preliminary approach to assessing soil vapour conditions. This approach did not use narrow diameter specialist soil vapour wells and, whilst it allows an initial assessment of conditions, is recognised as having some limitations due to the length of response zone(s).

3.3 Ground Investigation Factual Data

The investigation locations were surveyed in by the appointed surveying contractor to an accuracy of approximately +/- 0.1m. A Site Layout and Approximate Intrusive Location Plan is presented as Figure 2.

Delta-Simons engineer verified borehole logs are presented as Appendix B.



3.4 Environmental Sampling, In-Situ Testing and Laboratory Analysis

Ground gas samples were collected from each of the eight boreholes on 7th June 2018. The ground gas and soil vapour samples were collected using Tedlar bags and Tenax tubes.

Ground gas samples analysed for environmental purposes were placed in cool boxes on Site and transported to the laboratory for analysis on completion of the ground gas sampling visit.

The rationale for chemical analysis is presented in the table below and the results of the chemical laboratory testing are included in Appendix C.

Analytes

No. of Samples Tested

Rationale

Ground Gas: Ethane, methane, carbon monoxide, carbon dioxide, hydrogen sulphide, oxygen

8

In order to assess the risk of soil vapour / ground gas intrusion.

Soil Vapour: TPH C5-C12, TPH C12-C16, Volatile Organic Compounds (VOCs)

8

3.5 Monitoring Programme

Four rounds of groundwater level and ground gas monitoring were undertaken on all newly installed wells (DS01 – DS08) between 7th and 26th June 2018. Measurements of the depth to groundwater within the monitoring wells were taken using an electronic dip meter. The groundwater level monitoring sheets are included as Appendix D.

To characterise the ground gas regime at the Site, an infrared gas meter was used to measure gas flow, concentrations of carbon dioxide (CO2), methane (CH4) and oxygen (O2) in percentage by volume. Initial and steady state concentrations were recorded. The atmospheric pressure before and during monitoring, together with the weather conditions, was recorded. All monitoring results obtained to date together with the temporal conditions are contained within Appendix D.

3.6 Soil Vapour Sampling

Soil vapour samples were obtained during the first visit on 7th June 2018. Soil vapour samples were obtained using Tedlar bags and Tenax Tubes. Tedlar bag samples were obtained by attaching the Tedlar bag valve to the exhaust tube of a landfill gas analyser (GA2000), whilst the inflow tube was connected to the gas bung within the monitoring well. Following this, a pump was used to obtain the Tenax tube samples, set to a rate of 120 mL/minute and run for half an hour.

In the laboratory, Tedlar bag samples were analysed for bulk ground gases whilst Tenax tubes were analysed for hydrocarbons and VOCs. ………



4.0 Ground Summary

4.1 Introduction

The sections below summarise the ground and groundwater conditions encountered during the Site investigation.

4.2 Ground Model

A summary of the observed ground conditions at the Site is provided below.

Summary of Observed Ground Conditions

Strata Typical Strata Description Depth Range

of Strata Base (m)

Maximum Proven

Thickness (m) Comments

Topsoil Topsoil comprised dark brown slightly silty sand with occasional gravel of mixed lithologies including brick.

0.3 0.3 Topsoil was only encountered in DS02.

Made Ground

Beneath a layer of concrete, tarmac or grass, Made Ground initially comprised granular deposits with gravel content including limestone, brick, quartzite, granite, concrete and asphalt.

Beneath the granular deposits, pulverised fuel ash (PFA) was encountered in DS01, DS02, DS06 and DS07. In the remainder of locations, brownish / orangish red sand was encountered, with gravel comprising sandstone. Both of these strata were generally underlain by further granular Made Ground or natural Tidal Flat Deposits.

3.0 3.0

Slag was encountered in DS02 (2.5 to 3.0 m bgl) and DS05 (1.9 to 2.0 m bgl).

DS05 was terminated in the Made Ground at 2.0 m bgl due to encountering an obstruction.

Tidal Flat Deposits Tidal Flat Deposits were generally encountered as soft to firm brownish grey clay with occasional organic material.

3.0 0.6 Tidal Flat Deposits were encountered in DS01, DS04 and DS08.

4.3 Visual and Olfactory Evidence of Contamination - Soils

No visual or olfactory evidence of potential gross contamination was observed during the investigation.

4.4 Groundwater

4.4.1 Strikes During Investigations

Groundwater was not encountered during drilling at the Site.

4.4.2 Levels During Monitoring Programme

Groundwater levels were monitored on a total of four occasions between 7th and 26th June 2018. Monitoring data and LNAPL measurements are provided in Appendix D and summarised in the table below.



Exploratory Hole

Response Zone Water level during monitoring

Max to Min Range

LNAPL

Y/N

Stratum

m bgl m AOD m bgl m AOD

DS01 1.0 – 3.0 6.33 – 4.33 1.68 – 1.91 5.65 – 5.42 N Made Ground

DS02 1.0 – 3.0 7.46 – 5.46 DRY DRY N N/A

DS03 1.0 – 3.0 6.46 – 4.46 DRY DRY N N/A

DS04 1.0 – 3.0 6.54 – 4.54 2.74 – 2.90 4.80 – 4.64 N Tidal Flat Deposits

DS05 0.5 – 2.0 6.53 – 4.53 1.89 – 1.97 5.64 – 5.56 N Made Ground

DS06 1.0 – 3.0 7.19 – 5.19 DRY DRY N N/A

DS07 1.0 – 3.0 6.92 – 4.92 DRY DRY N N/A

DS08 1.0 – 3.0 6.27 – 4.27 2.05 – 2.15 5.22 – 5.12 N Made Ground

Groundwater levels during monitoring varied between 1.68 and 2.90 m bgl (5.65 to 4.64 m AOD) within the Made Ground and Tidal Flat Deposits. This is considered to be representative of perched groundwater at the Site.

4.5 Visual and Olfactory Evidence of Contamination - Groundwater

No visual or olfactory evidence of potential gross contamination was observed during the investigation.

4.6 Ground Gas Data

Gas monitoring results are presented in Appendix D and are summarised in the table below, a total of four rounds of gas monitoring was undertaken over a period of four weeks.

Barometric pressures ranged from 1015 mB (visit 2) to 1025 (visit 4).

Exploratory Hole

Steady Gas Concentration (%v/v) Steady

Flow Rate (l/hr)

Response Zone (m bgl)

Stratum Flooded? Methane Carbon Dioxide

Oxygen

Min Max Min Max Min Max Min Max From To

DS01 <0.1 <0.1 <0.1 0.4 16.2 19.7 <0.1 <0.1 1.0 3.0 Made Ground and Tidal Flat

Deposits N

DS02 <0.1 0.1 0.6 1.1 14.7 20.1 <0.1 <0.1 1.0 3.0 Made Ground N

DS03 <0.1 <0.1 1.1 4.1 12.4 18.4 <0.1 <0.1 1.0 3.0 Made Ground N

DS04 <0.1 <0.1 0.1 4.3 9.7 20.7 <0.1 <0.1 1.0 3.0 Made Ground &

Tidal Flat Deposits

N

DS05 <0.1 0.1 0.6 6.4 14.6 18.8 <0.1 <0.1 0.5 2.0 Made Ground N

DS06 <0.1 <0.1 0.1 0.6 19.7 21.2 <0.1 0.1 1.0 3.0 Made Ground N



DS07 <0.1 <0.1 <0.1 0.2 20.3 21.5 <0.1 0.1 1.0 3.0 Made Ground N

DS08 <0.1 <0.1 1.0 2.2 15.1 17.8 <0.1 <0.1 1.0 3.0 Made Ground &

Tidal Flat Deposits

N



5.0 Bulk Ground Gas Risk Assessment

5.1 Ground Gas Conceptual Site Model

5.1.1 Sources

Historically the Site was shown to have been raised in 1927 and levelled by 1980. It is understood that chemical waste was previously present on-Site, however, this was reportedly removed and replaced by pulverised fuel ash (PFA). Additionally, Delta-Simons Phase I Environmental Assessment indicates that there are two historical landfill sites listed in the west and east of the Site, with deposited waste including industrial waste. Made Ground has been encountered to a maximum depth of 3.0 m bgl.

The Made Ground generally comprises granular deposits, with gravel content including limestone, brick, quartzite, granite, concrete and asphalt. Slag was encountered in DS02 and DS05. The Made Ground is considered to represent a potential source of ground gas, although the volume of putrescible material appears to be low.

Surrounding historical land uses, which include former industrial facilities, may represent localised off-Site sources of ground gases.

No current waste management facilities (landfills) have been identified within a 250 m radius of the Site. However, two historical landfill sites have been identified as follows:

▲ Foundry Lane located approximately 40 m south of the Site; and

▲ Ditton Marsh located approximately 90 m east of the Site, with deposited waste including industrial waste.

5.1.2 Receptors

The principal receptors under consideration are future Site users. Other receptors include adjacent site occupiers and future maintenance/construction workers.

5.1.3 Pathways

The underlying geology is likely to be of variable permeability with respect to ground gases and soil vapours. The Made Ground is predominantly granular and is likely to allow preferential migration locally. The underlying Tidal Flat Deposits are cohesive and are therefore likely to limit vertical migration from below and also lateral migration.

Based on the above, migration from off-Site sources, including historical industrial land uses and the historical landfill sites located within 250 m of the Site is considered unlikely due to the presence of Tidal Flat Deposits. However, given the absence of details concerning the former landfill sites, the potential for migration of gas from these sources should not be discounted at this stage.

The most significant pathways with respect to future Site users relate to the potential for gases or vapours to enter the current building, especially enclosed ground floor office spaces. At present, it is not known whether gas protection measures were installed during construction of the building. Consequently, ingress into the building may be possible through voids in the floor including service entry points and cracks.

Future maintenance / construction workers may come into contact with hazardous ground gases via entry into below ground confined spaces such as excavations or service entries / inspection points.

5.2 Duration & Extent of Monitoring

Gas monitoring has been carried out upon the Site on four occasions over four weeks following completion of the intrusive ground investigation works. The locations of the monitoring wells are highlighted on Figure 2 and indicate representative coverage across the whole study area.

Barometric pressures during the gas monitoring period ranged from 1015 mB to 1019 mB. One of the four visits was completed during periods of falling pressure.



5.3 Ground Gas Risk Assessment

5.3.1 Background

Based on the commercial use of the Site, the following documents have been consulted when assessing the gas regime at the Site:

▲ British Standards Institute (BSI, 2015): Code of practice for the design of protective measures for methane and carbon dioxide ground gases for new buildings, BS:8485.

The presence of a source of hazardous gas within the ground does not necessarily indicate a risk will be present. Consideration of recorded gas flows together with source concentrations can allow an initial assessment to be made of the potential both for generation and subsequent migration of gas. A Characteristic Situation (CS) is derived from an assessment of the ground gas data and forms the basis of determining mitigation measures.

5.3.2 Gas Screening Value (GSV)

The Gas Screening Value (gas concentration as a fraction x maximum recorded flow) is used to provide an initial assessment of risks to future site users. The GSVs calculated for the monitoring wells are presented in the following table.

Location

Maximum Methane

(%v/v)

Maximum Carbon Dioxide (%v/v)

Maximum Flow Rate

(l/hr)

GSV / Characteristic Situation

Flooded well

(Frequency)

Methane Carbon Dioxide

GSV CS GSV CS

DS01 <0.1 0.4 <0.1 0.0001 CS1 0.0004 CS1 N

DS02 0.1 1.9 <0.1 0.0001 CS1 0.0019 CS1 N

DS03 <0.1 4.1 <0.1 0.0001 CS1 0.0041 CS1 N

DS04 <0.1 4.4 <0.1 0.0001 CS1 0.0044 CS1 N

DS05 0.7 6.4 <0.1 0.0007 CS1 0.0064 CS1+ N

DS06 0.1 0.6 0.2 0.0002 CS1 0.0012 CS1 N

DS07 <0.1 0.2 0.1 0.0001 CS1 0.0002 CS1 N

DS08 <0.1 2.2 0.1 0.0001 CS1 0.0022 CS1 N

Notes: CS1+ = Calculated GSV is CS1; however, peak carbon dioxide exceeds 5% v/v, therefore, consider increase in CS value.

In accordance with BSI guidance, and using maximum recorded parameters and the calculated GSV’s, the Site has been classified as CS2. This is entirely due to the maximum carbon dioxide concentration having exceeded 5% v/v in DS05 which increases the CS classification from 1 to 2.

Ground gas protection measures would typically be recommended in this scenario in the event of a Site redevelopment, however, given that elevated concentrations of carbon dioxide (>5% v/v) have only been encountered in DS05 in the yard area on two occasions (5.3% v/v and 6.4% v/v during the second and third monitoring visits respectively), and that elevated flow rates have not been encountered, it is considered that the risk to future Site users is low, especially given that the current building predominantly comprises a large open warehouse where accumulation of ground gas is very unlikely, and that DS05 is located approximately 90 m north of the area of the building utilised as office space.



5.4 Radon

The Site is not located within an area where radon protective measures are required.



6.0 Soil Vapour Risk Assessment

6.1 Overview

Traditionally, assessment of risks associated with volatile contaminants within the UK has relied upon soil sampling and consideration against Generic Assessment Criteria (e.g. Soil Guideline Values). In the context of this Site those criteria would typically be commercial/industrial. The model adopted for the development of these criteria relevant to the transport and migration of vapours is the Johnson and Ettinger model as implemented in the CLEA v1.071 model and associated documentation, notably Environment Agency (2009), Updated Technical Background to the CLEA Model, Report SC050021/SR3, January 2009.

It is highlighted that practice in other jurisdictions required assessment of risks from soil vapour through more direct measurement of soil vapour concentrations rather than modelling from soil and groundwater concentrations and an approach of soil vapour sampling has been adopted for this assessment as a reasonable screening assessment to identify whether risks are likely to be present.

6.2 Approach

In order to make an initial assessment of risks associated with soil vapours, the installed ground gas monitoring wells were sampled. It is noted that these samples are from outside of the building footprint and it is assumed that conditions are representative of general conditions in the shallow subsurface across the site.

Soil vapour samples were collected from each of the eight monitoring wells located in external areas across the Site on 7th June 2018 as described in Section 3.6.

Samples were tested at a UKAS accredited laboratory for a range of appropriate potential contaminants as described in Section 3.4.

6.3 Results

A summary of the results compared against their respective Air Quality Criteria (AQC) is presented below and a copy of the full results is provided in Appendix C.

6.4 Assessment Criteria

Published screening concentrations for soil vapours do not exist within the UK regulatory regieme; the approach adopted for a screening assessment such as this is to derive land use specific Air Quality Criteria as a starting point to understand the significance of the concentrations recorded from the in-ground samples. Where exceedances of the AQC are identified then further consideration can be given to what next steps need to be taken. It is highlighted that the derived AQC are orders of magnitude lower the Occupational Health criteria (EH40) where these exist and so the approach is considered to be conservative. Further, the AQC take no account of the attenuation which occurs between inground concentrations and indoor air.

In order to identify appropriate Air Quality Criteria to be adopted to assess the recorded concentrations of substances in the subsurface, a review of available toxicological data has been undertaken and, where appropriate, Air Quality Criteria (AQC) developed from the published Health Criteria Values.

The maximum recorded concentrations are compared directly to the AQC for a first stage of assessment to identify those substances which require further consideration. The table below displays the highest concentration of each compound across Site; the compound concentrations exceeding the AQC.



Compound Max Conc. (µg/m3)

Adopted Air Quality Target (µg/m3)

Justification for AQC

Benzene 6.5 5 Based on the Air Quality Objective for England and Wales which forms the basis of the Index Dose for Benzene as detailed in the relevant SGV document (Environment Agency 2009a)

Toluene 108.3 4900 The EA reports an inhalation tolerable daily intake of 1400 µg/kg bw-1 day-1 in the Toluene SGV document (Environment Agency 2009c). On the basis of a 70 kg adult inhaling 20 m3 per day, an assessment value of 4900 µg/m3 is calculated. No background has been taken into account.

Ethylbenzene 31.7 260 The EA reports an inhalation tolerable daily intake of 220 µg/kg bw-1 day-1 in the Ethylbenzene SGV document (Environment Agency 2009b); this is derived from the tolerable concentration in air of 770 µg/m3 derived by RIVM is calculated. However, the LQM/CIEH S4ULs report a tolerable daily intake of 74.3µg/kg-1 BW day-1 via inhalation for ethylbenzene. On the basis of a 70 kg adult inhaling 20 m3 per day, an assessment value of 260 µg/m3 is calculated. No background has been taken into account.

m/p-xylene 78.3 210 The EA reports an inhalation tolerable daily intake of 60 µg/kg bw-1 day-1 in the Xylene SGV document (Environment Agency 2009e). On the basis of a 70 kg adult inhaling 20 m3 per day, an assessment value of 210 µg/m3 is calculated. No background has been taken into account. The TDI reported in the LQM/CIEH S4ULs is also 60µg/kg-1 BW day-1 via inhalation for xylenes.

o-xylene 51.7 210

Aliphatic >C5-C6 55 17500 The LQM/CIEH S4ULs report a tolerable daily intake of 5000 µg/kg/day via inhalation for EC5-EC8 aliphatic hydrocarbons. On the basis of a 70 kg adult inhaling 20 m3 per day, an assessment value of 17,500 µg/m3 is calculated. No background has been taken into account.

Aliphatic >C6-C8 240

Aliphatic >C8-C10 660 1015 The LQM/CIEH S4ULs report a tolerable daily intake of 290 µg/kg/day via inhalation for EC8-EC16 aliphatic hydrocarbons. On the basis of a 70 kg adult inhaling 20 m3 per day, an assessment value of 1015µg/m3 is calculated. No background has been taken into account.



Aromatic >EC5-EC7 39 4900 The LQM/CIEH S4ULs report a tolerable daily intake of 1400 µg/kg/day via inhalation for EC5-EC7 aromatic hydrocarbons. On the basis of a 70 kg adult inhaling 20 m3 per day, an assessment value of 4900 µg/m3 is calculated. No background has been taken into account.





Compound Max Conc. (µg/m3)

Adopted Air Quality Target (µg/m3)

Justification for AQC



Trichlorotrifluoromethane 6.2 N/A No appropriate toxicological data has been identified for trichlorotrifluromethane

Propanone 2.8 No appropriate toxicological data has been identified for propanone

n-propylbenzene 5.3 770 The LQM/CIEH S4ULs report a tolerable daily intake of 220 µg/kg/day via inhalation for propylbenzene.On the basis of a 70 kg adult inhaling 20 m3 per day, an assessment value of 770 µg/m3 is calculated. No background has been taken into account.

1,3,5-Trimethylbenzene 38.3 n/a No appropriate toxicological data has been identified for 1,3,5-trimethylbenzene

1,2,4-Trimethylbenzene 7.8 7 The EIC, CL:AIRE report a tolerable daily intake of 2 µg/kg/day via inhalation for 1,2,4-trimethylbenzene. On the basis of a 70 kg adult inhaling 20 m3 per day, an assessment value of 7 µg/m3 is calculated. No background has been taken into account.

sec-butylbenzene 8.5 n/a No appropriate toxicological data has been identified for sec-butylbenzene

4-isopropyltoluene 6 n/a No appropriate toxicological data has been identified for 4-isopropyltoluene

Naphthalene 6.3 3 The LQM/CIEH S4ULs report a tolerable daily intake of 0.86 µg/kg/day via inhalation for naphthalene. On the basis of a 70 kg adult inhaling 20 m3 per day, an assessment value of 3 µg/m3 is calculated. No background has been taken into account.

Trichloroethene 1 2 The LQM/CIEH S4ULs report a tolerable daily intake of 0.57 µg/kg/day via inhalation for trichloroethene. On the basis of a 70 kg adult inhaling 20 m3 per day, an assessment value of 2 µg/m3 is calculated. No background has been taken into account.

trans-1,2-dichloroethene 0.9 60 The LQM/CIEH S4ULs report a tolerable daily intake of 17 µg/kg/day via inhalation for trans-1,2-dichloroethene. On the basis of a 70 kg adult inhaling 20 m3 per day, an assessment value of 60 µg/m3 is calculated. No background has been taken into account.

Trichloromethane (Chloroform)

7.2 140 The LQM/CIEH S4ULs report a tolerable daily intake of 40 µg/kg/day via inhalation for trichloromethane. On the basis of a 70 kg adult inhaling 20 m3 per day, an assessment value of 140 µg/m3 is calculated. No background has been taken into account.

1,1,1-Trichloroethane 20 2100 The LQM/CIEH S4ULs report a tolerable daily intake of 600 µg/kg/day via inhalation for 1,1,1-Trichloroethane. On the basis of a 70 kg adult inhaling 20 m3 per day, an assessment value of 2100 µg/m3 is calculated. No background has been taken into account.



6.5 Exceeding Samples

Based on the review of recorded concentrations of substances of concern sampled from the various wells, the following have been identified as exceeding the AQC and requiring further consideration:

▲ Benzene – three locations: DS03 (6.5 ug/m3), DS04 (5.3 ug/m3) and DS05 (5.2 ug/m3);

▲ Aromatic EC8-EC10 – all locations: DS01 (1800 ug/m3), DS02 (480 ug/m3), DS03 (540 ug/m3), DS04 (930 ug/m3), DS05 (760 ug/m3), DS06 (890 ug/m3), DS07 (1000 ug/m3), DS08 (490 ug/m3); and

▲ Aromatic EC10-EC12 – six of eight locations: DS01 (410 ug/m3), DS03 (310 ug/m3), DS04 (250 ug/m3), DS05 (440 ug/m3), DS06 (360 ug/m3), DS07 (550 ug/m3).

It is noted that these are all hydrocarbon species and likely to be associated with historical hydrocarbon sources.

6.6 Discussion and Conclusion

The concentrations recorded which exceeded the applied AQC are concentrations of potential contaminants in the ground. Due to the nature of the sampling being from wider dynamic sample wells (e.g. 50mm diameter) with extensive response zones rather than from narrow diameter (e.g. <5mm diameter) specialist vapour wells with a limited response zone (e.g. <1-2cm), the data is not considered appropriate to use in a fully justifiable way in a model (e.g. Johnson and Ettinger) to estimate indoor air concentrations.

However, given the magnitude of exceedances of AQC are so very limited with the maximum being only 10 times the applied AQC, it is considered that no further modelling is needed to conclude that the data is evidence that concentrations of the detected contaminants associated with the below ground sources will not result in indoor air concentrations that exceed the AQC based on the attenuation and dilution that will occur from in ground to indoor air, especially in the context of a warehouse use.

On this basis, a risk is not considered to be present associated with vapour intrusion based on the data collected.



7.0 Revised Conceptual Site Model

A revised CSM is presented in the table below which has been formulated taking into account all of the available data from the Delta-Simons intrusive investigation, suitable for the commercial use of the Site.

Revised Conceptual Site Model

Source Pathways Receptors Confirmed Risk?

Mitigation

On-Site Made Ground deposits associated with historical landfills and removal of chemical waste.

Off-Site sources including current and historical industrial / commercial land uses and historical landfill sites.

Indoor exposure / explosive hazard via enclosed space accumulation of ground gas

Inhalation of volatile vapours

Future Site users See Discussion

The Site has been classified as CS2 due to the maximum carbon dioxide concentration having exceeded 5% v/v in DS05, which increases the CS classification from 1 to 2. Ground gas protection measures would be necessary under this scenario should new buildings be constructed at the Site, however, given that elevated concentrations of carbon dioxide (>5% v/v) have only been encountered in DS05 in the yard area on two occasions (5.3% v/v and 6.4% v/v during the second and third monitoring visits respectively), and that elevated flow rates have not been encountered, it is considered that the risk to future Site users is low, especially given that the current building predominantly comprises a large open warehouse where accumulation of ground gas is very unlikely, and that DS05 is located approximately 90 m north of the area of the building utilised as office space.

Elevated concentrations of benzene and petroleum hydrocarbons have been identified within the ground gas samples collected from the monitoring wells at the Site.

However, given that the magnitude of exceedances of conservative AQC in the ground are very limited, it is considered that no further modelling is needed to conclude that the data is evidence that concentrations of the detected contaminants associated with the below ground sources will not result in indoor air concentrations that exceed the AQC based on the attenuation and dilution that will occur from in ground to indoor air, especially in the context of a warehouse use.



8.0 Conclusions & Recommendations

8.1 Contamination Issues

The investigation has been carried out in order to provide comfort and surety and to provide a ground investigation suitable “benchmark” of the ground conditions beneath the Site, prior to the Client taking up occupation of the Site. The work has focussed on ground gas and soil vapour risks.

In accordance with BS8485 guidance, and using maximum recorded parameters and the calculated GSV’s, the Site has been classified as CS2. This is entirely due to the maximum carbon dioxide concentration having exceeded 5% v/v in DS05 which increases the CS classification from 1 to 2. Ground gas protection measures would typically be recommended under this scenario should new buildings be constructed at the Site. However, given that elevated concentrations of carbon dioxide (>5% v/v) have only been encountered in DS05 in the yard area on two occasions (5.3% v/v and 6.4% v/v during the second and third monitoring visits respectively), and that elevated flow rates have not been encountered, it is considered that the risk to future Site users is low, especially given that the current building predominantly comprises a large open warehouse where accumulation of ground gas is very unlikely, and that DS05 is located approximately 90 m north of the area of the building utilised as office space.

Analysis of soil vapour samples has identified elevated concentrations of benzene and petroleum hydrocarbons. However, given the magnitude of exceedances of AQC are so very limited with the maximum being only 10 times the applied AQC, it is considered that no further modelling is needed to conclude that the data is evidence that concentrations of the detected contaminants associated with the below ground sources will not result in indoor air concentrations that exceed the AQC based on the attenuation and dilution that will occur from in ground to indoor air, especially in the context of a warehouse use. On this basis, a risk is not considered to be present associated with vapour intrusion based on the data collected.

8.2 Recommendations for Supplementary Work

Based on the findings of this Assessment, it is considered that the risk to future end users from vapour / ground gas intrusion is low and therefore, it is not considered that further action is necessary prior to occupation of the Site.

Were the Site to be redeveloped in future then a more comprehensive assessment would be needed.


Figure 1 – Site Location Map

Site Location

Site Location Map

Foundry Point

Widnes

To Scale@A4

1

25 June 2018

18-0599.02

1

EN

GT

Scale: 1 / 500,000 @ A4

LEGEND

Site Boundary

Scale: 1 / 10,000 @ A4

TITLE: PROJECT NO:

FIGURE NO:

SCALE:

REVISION:

DRAWN BY:

CHECKED BY:

DATE:

Contains OS data © , Crown Copyright and Database Right (2018)


Figure 2 - Site Layout and Approximate Intrusive Location

Plan

DS01(s)

DS02(s)

DS03(s)

DS04(s)

DS05(s)

DS06(s)

DS07(s)

DS08(s)

Not to Scale

1

26 June 2018

18-0599.02

2

EN

GT

Site Layout and Approximate Intrusive Location Plan

Foundry Point

Widnes

TITLE: PROJECT NO:

FIGURE NO:

SCALE:

REVISION:

DRAWN BY:

CHECKED BY:

DATE:

Contains OS data © , Crown Copyright and Database Right (2018)Contains Data from, © 2018 Landmark Information Group Ltd

LEGEND

Site Boundary

Dynamic Sampler

(s) Standpipe

DSx


Appendix A - Limitations


Limitations

The recommendations contained in this Report represent Delta-Simons professional opinions, based upon the information listed in the Report, exercising the duty of care required of an experienced Environmental Consultant. Delta-Simons does not warrant or guarantee that the Site is free of hazardous or potentially hazardous materials or conditions.

Delta-Simons obtained, reviewed and evaluated information in preparing this Report from the Client and others. Delta-Simons conclusions, opinions and recommendations has been determined using this information. Delta-Simons does not warrant the accuracy of the information provided to it and will not be responsible for any opinions which Delta-Simons has expressed, or conclusions which it has reached in reliance upon information which is subsequently proven to be inaccurate.

This Report was prepared by Delta-Simons for the sole and exclusive use of the Client and for the specific purpose for which Delta-Simons was instructed. Nothing contained in this Report shall be construed to give any rights or benefits to anyone other than the Client and Delta-Simons, and all duties and responsibilities undertaken are for the sole and exclusive benefit of the Client and not for the benefit of any other party. In particular, Delta-Simons does not intend, without its written consent, for this Report to be disseminated to anyone other than the Client or to be used or relied upon by anyone other than the Client. Use of the Report by any other person is unauthorised and such use is at the sole risk of the user. Anyone using or relying upon this Report, other than the Client, agrees by virtue of its use to indemnify and hold harmless Delta-Simons from and against all claims, losses and damages (of whatsoever nature and howsoever or whensoever arising), arising out of or resulting from the performance of the work by the Consultant.


Appendix B – Exploratory Hole Logs

Description of Strata

MADE GROUND: Tarmac.MADE GROUND: Light yellow slightly sandy gravel of fine to medium subangular to subrounded limestone. Sand is medium to coarse.MADE GROUND: Reddish brown very sandy gravel of mixed lithologies including fine to coarse subangular to subrounded limestone and rare brick. Sand is medium to coarse.MADE GROUND: Grey sandy silt. Sand is fine to medium. (Pulverised fuel ash).

Firm grey CLAY with occasional organic material.(TIDAL FLAT DEPOSITS)

Borehole complete at 3.00 m bgl.

LegendStrata Depth(m bgl)

0.100.20

0.60

2.40

3.00

Strata Thickness

(m)

(0.10)(0.10)

(0.40)

(1.80)

(0.60)

Reduced Level

(mAOD)

7.237.13

6.73

4.93

4.33

Casing Diameter

(mm)Water

Sample Details

Depth (m) Type Ref

Test Details

Depth (m)

1.00

2.00

Results

PID=0.0ppmv

PID=0.0ppmv

Backfill

Head Office3 Henley Way, Doddington Road

Lincoln, LN6 3QRTel: +44 (0) 1522 882555

Email: [email protected]

Project No:

Project:

18-0599.02Hole ID:

DS01Page:1 of 1

Foundry Point, Widnes

Dynamic Sampler LogDate:

31/05/2018Client: Amazon UK

Services Limited

Remarks:1. Engineer verified logged in general accordance to BS 5930:2015. 2. Area CAT scanned prior to excavation. 3. Borehole remained dry upon completion. 4. Borehole installed with 50 mm diameter standpipe, gas bung and lockable traffic strength flush cover.

Coordinates:E349166.40 N384317.96

Elevation (mAOD):7.33

Drilled By:Paul Blackledge Drilling

Plant Used:Premier 110

Logged:GT

Checked:TH

Approved:TH

Scale:1:30

Water Strike

Date Time Depth Strike

Water Level

Duration Depth Water

Borehole Diameter

Depth Base Diameter


Grass over: Dark brown slightly silty medium sand with occasional gravel of mixed lithologies including fine to medium subangular to subrounded brick. (TOPSOIL).MADE GROUND: Greyish brown sandy gravel of fine to coarse subangular to subrounded limestone with rare brick. Sand is medium to coarse.MADE GROUND: Grey sandy silt with rare gravel of mixed lithologies including fine to medium subangular to subrounded brick and rare quartzite. Sand is fine to medium. (Pulverised fuel ash).

MADE GROUND: Brownish blueish grey sandy gravel of fine to coarse subangular to subrounded slag. Sand is medium.



0.300.40

2.50

3.00

Strata Thickness

(m)

(0.30)

(0.10)

(2.10)

(0.50)

Reduced Level

(mAOD)

8.168.06

5.96

5.46

Casing Diameter

(mm)Water

Sample Details

Depth (m) Type Ref

1

Test Details

Depth (m)

0.80

2.50

Results

PID=0.0ppmv

PID=1.5ppmv

Backfill

2.50 ES


Lincoln, LN6 3QRTel: +44 (0) 1522 882555


Project No:

Project:

18-0599.02Hole ID:

DS02Page:1 of 1




Services Limited


Coordinates:E349148.51 N384365.31




Logged:GT

Checked:TH

Approved:TH

Scale:1:30

Water Strike


Water Level


Borehole Diameter

Depth Base Diameter


Reinforced concrete.

MADE GROUND: Grey gravel of medium to coarse subangular to subrounded quartzite, granite and limestone.MADE GROUND: Dark brownish red medium sand with frequent gravel of mixed lithologies including fine to coarse subangular to subrounded quartzite and sandstone.

No recovery.

MADE GROUND: Dark grey slightly clayey slightly sandy gravel of medium to coarse granite and quartzite. Sand is medium to coarse.

MADE GROUND: Whitish brown slightly clayey slightly sandy gravel of fine to coarse subangular to subrounded quartzite and limestone. Sand is medium to coarse.



0.200.25

1.50

2.00

2.60

3.00

Strata Thickness

(m)

(0.20)

(1.25)

(0.50)

(0.60)

(0.40)

Reduced Level

(mAOD)

7.267.21

5.96

5.46

4.86

4.46

Casing Diameter

(mm)Water

Sample Details

Depth (m) Type Ref

Test Details

Depth (m)

0.40

Results

PID=0.0ppmv

Backfill


Lincoln, LN6 3QRTel: +44 (0) 1522 882555


Project No:

Project:

18-0599.02Hole ID:

DS03Page:1 of 1




Services Limited

Remarks:1. Engineer verified logged in general accordance to BS 5930:2015. 2. Area CAT scanned prior to excavation. 3. Borehole remained dry upon completion. 4. Voiding noted between 1.5 m bgl and 2.0 m bgl. 5. Borehole installed with 50 mm diameter standpipe, gas bung and lockable traffic strength flush cover.

Coordinates:E349139.07 N384420.21




Logged:GT

Checked:TH

Approved:TH

Scale:1:30

Water Strike


Water Level


Borehole Diameter

Depth Base Diameter



MADE GROUND: Grey slightly clayey slightly sandy gravel of mixed lithologies including fine to coarse subangular to subrounded quartzite and limestone.MADE GROUND: Orange fine to medium sand with occasional gravel of fine to medium subangular to subrounded sandstone.

MADE GROUND: Brownish grey clayey gravel of fine to coarse subangular to subrounded granite and quartzite.

Firm brownish grey mottled black CLAY with rare shell fragments from 2.9 m bgl.(TIDAL FLAT DEPOSITS)



0.15

0.40

2.35

2.70

3.00

Strata Thickness

(m)

(0.15)

(0.25)

(1.95)

(0.35)

(0.30)

Reduced Level

(mAOD)

7.39

7.14

5.19

4.84

4.54

Casing Diameter

(mm)Water

Sample Details

Depth (m) Type Ref

Test Details

Depth (m)

0.30

0.70

Results

PID=0.3ppmv

PID=0.0ppmv

Backfill


Lincoln, LN6 3QRTel: +44 (0) 1522 882555


Project No:

Project:

18-0599.02Hole ID:

DS04Page:1 of 1




Services Limited


Coordinates:E349154.66 N384448.56




Logged:GT

Checked:TH

Approved:TH

Scale:1:30

Water Strike


Water Level


Borehole Diameter

Depth Base Diameter



MADE GROUND: Grey slightly clayey slightly sandy gravel of mixed lithologies including fine to coarse subangular to subrounded limestone and one metal fragment. Sand is medium to coarse.MADE GROUND: Dark orange fine to medium sand with frequent gravel of fine to medium subangular to subrounded sandstone.MADE GROUND: Dark brownish red medium sand with occasional gravel of fine to medium subangular to rounded flint and sandstone. Rare pockets of ash present.

MADE GROUND: Greyish blackish white slightly sandy ashy gravel of possible slag.



0.200.30

0.70

1.902.00

Strata Thickness

(m)

(0.20)

(0.10)

(0.40)

(1.20)

(0.10)

Reduced Level

(mAOD)

7.337.23

6.83

5.635.53

Casing Diameter

(mm)Water

Sample Details

Depth (m) Type Ref

Test Details

Depth (m)

0.25

0.80

1.90

Results

PID=0.3ppmv

PID=0.8ppmv

PID=0.0ppmv

Backfill


Lincoln, LN6 3QRTel: +44 (0) 1522 882555


Project No:

Project:

18-0599.02Hole ID:

DS05Page:1 of 1




Services Limited

Remarks:1. Engineer verified logged in general accordance to BS 5930:2015. 2. Area CAT scanned prior to excavation. 3. Borehole remained dry upon completion. 4. Borehole terminated at 2.0 m bgl upon encountering an obstruction. 5. Borehole installed with 50 mm diameter standpipe, gas bung and lockable traffic strength flush cover.

Coordinates:E349167.37 N384412.87




Logged:GT

Checked:TH

Approved:TH

Scale:1:30

Water Strike


Water Level


Borehole Diameter

Depth Base Diameter


Grass over: MADE GROUND: Brown slightly silty slightly gravelly sand. Gravel is fine to coarse subangular to subrounded tarmac. MADE GROUND: Greyish brown sandy gravel of fine to coarse subangular to subrounded limestone with rare brick. Sand is medium to coarse.MADE GROUND: Grey sandy silt with occasional gravel of mixed lithologies including fine to medium subangular to subrounded brick and quartzite. Sand is fine to medium. (Pulverised fuel ash).

MADE GROUND: Greyish white slightly sandy gravel of fine to coarse subangular to subrounded quartzite and one brick fragment at 2.7 m bgl.



0.10

0.60

2.70

3.00

Strata Thickness

(m)

(0.10)

(0.50)

(2.10)

(0.30)

Reduced Level

(mAOD)

8.09

7.59

5.49

5.19

Casing Diameter

(mm)Water

Sample Details

Depth (m) Type Ref

Test Details

Depth (m)

0.60

Results

PID=0.0ppmv

Backfill


Lincoln, LN6 3QRTel: +44 (0) 1522 882555


Project No:

Project:

18-0599.02Hole ID:

DS06Page:1 of 1




Services Limited


Coordinates:E349196.18 N384401.41




Logged:GT

Checked:TH

Approved:TH

Scale:1:30

Water Strike


Water Level


Borehole Diameter

Depth Base Diameter


Grass over: MADE GROUND: Greyish brown sandy gravel of fine to coarse subangular to subrounded limestone with rare brick cobbles at 0.03 m bgl. Sand is medium to coarse.

MADE GROUND: Grey sandy silt with rare glass fragments. Sand is fine to medium. (Pulverised fuel ash).

MADE GROUND: Brownish white slightly sandy gravel of fine to coarse subangular to subrounded granite and quartzite. Sand is medium to coarse.



0.60

2.40

3.00

Strata Thickness

(m)

(0.60)

(1.80)

(0.60)

Reduced Level

(mAOD)

7.32

5.52

4.92

Casing Diameter

(mm)Water

Sample Details

Depth (m) Type Ref

Test Details

Depth (m)

0.50

1.40

Results

PID=0.1ppmv

PID=0.0ppmv

Backfill


Lincoln, LN6 3QRTel: +44 (0) 1522 882555


Project No:

Project:

18-0599.02Hole ID:

DS07Page:1 of 1




Services Limited


Coordinates:E349217.61 N384336.87




Logged:GT

Checked:TH

Approved:TH

Scale:1:30

Water Strike


Water Level


Borehole Diameter

Depth Base Diameter


MADE GROUND: Tarmac.MADE GROUND: Blackish grey slightly sandy gravel of mixed lithologies including fine to coarse subangular to subrounded concrete and limestone.MADE GROUND: Grey slightly clayey gravel of fine to coarse subangular to subrounded limestone.MADE GROUND: Orangish red fine to medium sand with occasional gravel of fine to medium subangular to subrounded sandstone.

MADE GROUND: Blackish grey slightly sandy gravel of mixed lithologies including fine to medium subangular to subrounded limestone.Soft to very soft black CLAY with frequent organic material.(TIDAL FLAT DEPOSITS)Soft to firm greyish brown CLAY with occasional organic material.(TIDAL FLAT DEPOSITS)



0.10

0.25

0.50

2.15

2.40

2.65

3.00

Strata Thickness

(m)

(0.10)(0.15)

(0.25)

(1.65)

(0.25)

(0.25)

(0.35)

Reduced Level

(mAOD)

7.17

7.02

6.77

5.12

4.87

4.62

4.27

Casing Diameter

(mm)Water

Sample Details

Depth (m) Type Ref

Test Details

Depth (m)

2.40

Results

PID=0.0ppmv

Backfill


Lincoln, LN6 3QRTel: +44 (0) 1522 882555


Project No:

Project:

18-0599.02Hole ID:

DS08Page:1 of 1




Services Limited


Coordinates:E349195.30 N384308.60




Logged:GT

Checked:TH

Approved:TH

Scale:1:30

Water Strike


Water Level


Borehole Diameter

Depth Base Diameter


Appendix C – Ground Gas and Soil Vapour Laboratory

Results

Chemtest Ltd.

Depot Road

Newmarket

CB8 0AL

Tel: 01638 606070


Report No.: 18-16310-1

Initial Date of Issue: 19-Jun-2018

Client Delta Simons

Client Address: 3 Henley Office Park

Doddington Road

Lincoln

Lincolnshire

LN6 3QR

Contact(s): Gemma Tatton

Tom Horner

Project 18-0599.02 Foundry Point, Widnes

Quotation No.: Date Received: 08-Jun-2018

Order No.: DS38847 Date Instructed: 08-Jun-2018

No. of Samples: 8

Turnaround (Wkdays): 7 Results Due: 18-Jun-2018

Date Approved: 19-Jun-2018 Subcon Results Due: 29-Jun-2018

Approved By:

Details: Martin Dyer, Laboratory Manager

Final Report

Page 1 of 4

Results - Gas

Client: Delta Simons 18-16310 18-16310 18-16310 18-16310 18-16310 18-16310 18-16310 18-16310

Quotation No.: 635399 635400 635401 635402 635403 635404 635405 635406

Order No.: DS38847 DS01 DS02 DS03 DS04 DS05 DS06 DS07 DS08

GAS GAS GAS GAS GAS GAS GAS GAS

07-Jun-2018 07-Jun-2018 07-Jun-2018 07-Jun-2018 07-Jun-2018 07-Jun-2018 07-Jun-2018 07-Jun-2018

Determinand Accred. SOP Units LOD

Ethane SN % v/v 0.00050 < 0.00050 < 0.00050 < 0.00500 < 0.00050 < 0.00050 < 0.00050 < 0.00050 < 0.00050

Methane S % v/v 0.50 < 0.50 < 0.50 < 0.50 < 0.50 0.68 < 0.50 < 0.50 < 0.50

Carbon Monoxide SN % v/v 0.50 < 0.50 0.73 < 0.50 < 0.50 < 0.50 < 0.50 < 0.50 < 0.50

Carbon Dioxide S % v/v 0.50 < 0.50 0.73 3.1 2.0 2.4 < 0.50 < 0.50 < 0.50

Hydrogen Sulphide S % v/v 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0

Oxygen S % v/v 0.50 17 16 15 15 16 21 21 17

Aliphatic TPH >C5-C6 N 3675 µg/m³ N/A 44 55 5.1 14 25 27 10 19

Aliphatic TPH >C6-C8 N 3675 µg/m³ N/A 110 76 97 240 150 81 16 130



Aliphatic TPH >C12-C16 N 3675 µg/m³ N/A 80 < 1.00 8.9 < 1.00 30 6.3 69 33

Aromatic TPH >C5-C7 N 3675 µg/m³ N/A 24 13 39 32 31 22 6.1 26

Aromatic TPH >C7-C8 N 3675 µg/m³ N/A 430 320 340 580 360 480 200 650



Aromatic TPH >C12-C16 N 3675 µg/m³ N/A < 1.00 < 1.00 20 < 1.00 9.9 < 1.00 38 < 1.00

Trichlorofluoromethane N 3760 µg/m³ N/A <0.8 6.2 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8

Propanone N 3760 µg/m³ N/A 1.8 2.8 <1.7 <1.7 2.3 <1.7 <1.7 <1.7

Diethyl ether N 3760 µg/m³ N/A <1.7 <1.7 <1.7 <1.7 <1.7 <1.7 <1.7 <1.7

1,1-Dichloroethene N 3760 µg/m³ N/A <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8

Carbon disulfide N 3760 µg/m³ N/A <0.7 <0.7 <0.7 <0.7 <0.7 <0.7 <0.7 <0.7

Allyl chloride N 3760 µg/m³ N/A <1.7 <1.7 <1.7 <1.7 <1.7 <1.7 <1.7 <1.7

trans-1,2-Dichloroethene N 3760 µg/m³ N/A <0.8 <0.8 <0.8 0.9 <0.8 <0.8 <0.8 <0.8

Methyl-tertiary-butyl ether N 3760 µg/m³ N/A <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8

1,1-Dichloroethane N 3760 µg/m³ N/A <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8

2-Butanone N 3760 µg/m³ N/A <1.7 <1.7 <1.7 <1.7 <1.7 <1.7 <1.7 <1.7

cis-1,2-Dichloroethene N 3760 µg/m³ N/A <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8

Trichloromethane N 3760 µg/m³ N/A 7.2 <0.7 0.7 1.0 <0.7 <0.7 <0.7 <0.7

Tetrahydrofuran N 3760 µg/m³ N/A <16.7 <16.7 <16.7 <16.7 <16.7 <16.7 <16.7 <16.7

1,1,1-Trichloroethane N 3760 µg/m³ N/A <0.7 <0.7 <0.7 20.0 <0.7 <0.7 <0.7 5.5

1,2-Dichloroethane N 3760 µg/m³ N/A <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8

1-Chlorobutane N 3760 µg/m³ N/A <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8

1,1-Dichloropropene N 3760 µg/m³ N/A <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8

Benzene N 3760 µg/m³ N/A 4.0 2.2 6.5 5.3 5.2 3.7 1.0 4.3

Tetrachloromethane N 3760 µg/m³ N/A <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8

2-Nitropropane N 3760 µg/m³ N/A <1.7 <1.7 <1.7 <1.7 <1.7 <1.7 <1.7 <1.7

Methyl methacrylate N 3760 µg/m³ N/A <1.7 <1.7 <1.7 <1.7 <1.7 <1.7 <1.7 <1.7

2-Hexanone N 3760 µg/m³ N/A <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5

4-Methyl-2-pentanone N 3760 µg/m³ N/A <4.2 <4.2 <4.2 <4.2 <4.2 <4.2 <4.2 <4.2

Trichloroethene N 3760 µg/m³ N/A <0.8 <0.8 <0.8 1.0 <0.8 <0.8 <0.8 <0.8

Dibromomethane N 3760 µg/m³ N/A <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8

Date Sampled:

Project: 18-0599.02 Foundry Point, Widnes

Chemtest Job No.:

Chemtest Sample ID.:

Client Sample Ref.:

Sample Type:

Page 2 of 4

Results - Gas

Client: Delta Simons 18-16310 18-16310 18-16310 18-16310 18-16310 18-16310 18-16310 18-16310

Quotation No.: 635399 635400 635401 635402 635403 635404 635405 635406

Order No.: DS38847 DS01 DS02 DS03 DS04 DS05 DS06 DS07 DS08

GAS GAS GAS GAS GAS GAS GAS GAS

07-Jun-2018 07-Jun-2018 07-Jun-2018 07-Jun-2018 07-Jun-2018 07-Jun-2018 07-Jun-2018 07-Jun-2018

Determinand Accred. SOP Units LOD

Date Sampled:

Project: 18-0599.02 Foundry Point, Widnes

Chemtest Job No.:

Chemtest Sample ID.:

Client Sample Ref.:

Sample Type:

Bromodichloromethane N 3760 µg/m³ N/A <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8

trans-1,3-Dichloropropene N 3760 µg/m³ N/A <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8

cis-1,3-Dichloropropene N 3760 µg/m³ N/A <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8

Toluene N 3760 µg/m³ N/A 58.3 53.3 56.7 96.7 60.0 80.0 33.3 108.3

1,1,2-Trichloroethane N 3760 µg/m³ N/A <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8

1,3-Dichloropropane N 3760 µg/m³ N/A <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8

Ethyl methacrylate N 3760 µg/m³ N/A <1.7 <1.7 <1.7 <1.7 <1.7 <1.7 <1.7 <1.7

Dibromochloromethane N 3760 µg/m³ N/A <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8

1,2-Dibromoethane N 3760 µg/m³ N/A <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8

Tetrachloroethene N 3760 µg/m³ N/A <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8

Chlorobenzene N 3760 µg/m³ N/A <0.7 <0.7 <0.7 <0.7 <0.7 <0.7 <0.7 <0.7

1,1,1,2-Tetrachloroethane N 3760 µg/m³ N/A <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8

Ethylbenzene N 3760 µg/m³ N/A 31.7 13.5 13.5 14.3 23.3 21.2 21.5 12.2

m- & p-Xylene N 3760 µg/m³ N/A 78.3 38.3 45.0 51.7 58.3 73.3 71.7 38.3

Bromoform N 3760 µg/m³ N/A <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8

o-Xylene N 3760 µg/m³ N/A <0.7 21.7 21.7 26.7 33.3 40.0 51.7 1.7

Styrene N 3760 µg/m³ N/A <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8

1,1,2,2-Tetrachloroethane N 3760 µg/m³ N/A <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8

1,2,3-Trichloropropane N 3760 µg/m³ N/A <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8

iso-Propylbenzene N 3760 µg/m³ N/A <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8

trans-1,4-Dichloro-2-butene N 3760 µg/m³ N/A <1.7 <1.7 <1.7 <1.7 <1.7 <1.7 <1.7 <1.7

Bromobenzene N 3760 µg/m³ N/A <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8

2-Chlorotoluene N 3760 µg/m³ N/A <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8

n-Propylbenzene N 3760 µg/m³ N/A 5.3 2.2 2.8 3.5 <0.8 3.8 <0.8 2.0

4-Chlorotoluene N 3760 µg/m³ N/A <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8

1,3,5-Trimethylbenzene N 3760 µg/m³ N/A 12.0 5.2 5.8 4.8 10.8 8.2 38.3 9.7

Pentachloroethane N 3760 µg/m³ N/A <1.7 <1.7 <1.7 <1.7 <1.7 <1.7 <1.7 <1.7

1,2,4-Trimethylbenzene N 3760 µg/m³ N/A 7.8 6.8 3.2 <0.8 5.5 2.8 7.8 1.5

tert-Butylbenzene N 3760 µg/m³ N/A <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8

1,3-Dichlorobenzene N 3760 µg/m³ N/A <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8

sec-Butylbenzene N 3760 µg/m³ N/A 8.5 4.2 4.0 4.3 5.7 4.6 6.5 <0.8


4-Isopropyltoluene N 3760 µg/m³ N/A 6.0 <0.8 1.2 <0.8 2.2 <0.8 <0.8 <0.8


n-Butylbenzene N 3760 µg/m³ N/A <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8

Hexachloroethane N 3760 µg/m³ N/A <1.7 <1.7 <1.7 <1.7 <1.7 <1.7 <1.7 <1.7

1,2-Dibromo-3-chloropropane N 3760 µg/m³ N/A <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8

1,2,4-Trichlorobenzene N 3760 µg/m³ N/A <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8

Naphthalene N 3760 µg/m³ N/A <0.8 <0.8 3.3 <0.8 <0.8 <0.8 6.3 <0.8

1,2,3-Trichlorobenzene N 3760 µg/m³ N/A <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8

Hexachlorobutadiene N 3760 µg/m³ N/A <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8

Page 3 of 4

Report Information

Key

U UKAS accredited

M MCERTS and UKAS accredited

N Unaccredited

S This analysis has been subcontracted to a UKAS accredited laboratory that is accredited for this analysis

SN This analysis has been subcontracted to a UKAS accredited laboratory that is not accredited for this analysis

T This analysis has been subcontracted to an unaccredited laboratory

I/S Insufficient Sample

U/S Unsuitable Sample

N/E not evaluated

< "less than"

> "greater than"

Comments or interpretations are beyond the scope of UKAS accreditation

The results relate only to the items tested

Uncertainty of measurement for the determinands tested are available upon request

None of the results in this report have been recovery corrected

All results are expressed on a dry weight basis

The following tests were analysed on samples as received and the results subsequently corrected to a dry

weight basis TPH, BTEX, VOCs, SVOCs, PCBs, Phenols

For all other tests the samples were dried at < 37°C prior to analysis

All Asbestos testing is performed at the indicated laboratory

Issue numbers are sequential starting with 1 all subsequent reports are incremented by 1

Sample Deviation Codes

A - Date of sampling not supplied

B - Sample age exceeds stability time (sampling to extraction)

C - Sample not received in appropriate containers

D - Broken Container

E - Insufficient Sample (Applies to LOI in Trommel Fines Only)

Sample Retention and Disposal

All soil samples will be retained for a period of 45 days from the date of receipt

All water samples will be retained for 14 days from the date of receipt

Charges may apply to extended sample storage

If you require extended retention of samples, please email your requirements to:

[email protected]

Page 4 of 4

mailto:[email protected]


Appendix D – Field Monitoring Data/Gas Monitoring Data

NR NR NR NR

m m m

DS01 <0.1 <0.1 <0.1 <0.1 0.4 0.4 16.2 16.2 1 10 0.0 NR 1018 NR 1.85 3.04

DS02 <0.1 <0.1 <0.1 <0.1 0.7 0.7 14.7 14.7 1 1 156.2 NR 1018 NR DRY 2.45

DS03 <0.1 <0.1 <0.1 <0.1 3.4 1.1 13.5 18.4 3 4 0.0 NR 1018 NR DRY 3.00

DS04 <0.1 <0.1 <0.1 <0.1 4.4 4.3 9.7 9.7 1 15 0.0 NR 1018 NR 2.90 2.92

DS05 <0.1 <0.1 0.7 0.1 2.6 0.6 15.2 18.8 3 12 0.0 NR 1018 NR 1.97 2.04

DS06 0.1 <0.1 0.1 <0.1 0.1 0.1 20.3 20.3 3 3 0.0 NR 1019 NR DRY 2.56

DS07 0.1 0.1 <0.1 <0.1 <0.1 <0.1 21.5 21.5 3 11 0.0 NR 1018 NR DRY 2.73

DS08 <0.1 <0.1 <0.1 <0.1 1.8 1.8 15.1 15.1 2 20 26.7 NR 1019 NR 2.14 2.64

FallingRising/Falling Trend (for the

three days before visit)

Gas sample taken (Tedlar bag and Tenax tube)








The formulae require that only numbers, "<0.1" for ground gas and flow or "DRY" for groundwater are entered in the sheet

Notes

(e.g. water colour, sheen, odour, damage to well or gas tap, flooded ground etc.)

Time

Wind speed (m/s)

Atm

os.

Pre

ssu

re

Dep

th t

o f

ree

pro

du

ct

Dep

th t

o w

ate

r

Dep

th t

o b

ase

l/hr % v/v % v/v


Client Amazon UK Services Limited

07/06/2018Date (DD/MM/YYYY)

General comments

CO VOC

Gas Analyser

Site Name

GROUNDWATERGROUND GAS

% v/v ppm

CH4 CO2 O2 H2S

Min

Stead

y

Max

Max

Max

Dif

fere

nti

al

(Rela

tive)

Pre

ssu

re

mb

NR

mb

Stead

y

CH4 (% v/v) CO2 (% v/v) O2 (% v/v) H2S (ppm)

© Delta-Simons Environmental Consultants Limited. No part of this document may be reproduced unless prior written permission has been granted.

Authorised By:K Hughes

Readings at start Dry/Rain/Snow/Ice

Version: 1.1 Issue Date: 11/07/17 Author: J Rhoades / S SteeleDocument No. C101

Max

Stead

y

Max

Stead

y

Max

Ref

End

Flow

NR

24.00

Dry Dry

Visit Number 1

12:30 18:30

Recorded by GT

Pressure (mb) 1018

Job number 18-0599.02WEATHER Start

1019

Wind Dir. (from)

Temperature (°C) 22.00

NR

NR

NR NR NR NR

m m m

DS01 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 18.7 18.7 0 0 257.0 NR 1019 NR 1.73 2.87

DS02 <0.1 <0.1 <0.1 <0.1 1.1 1.1 17.7 17.7 0 0 0.0 NR 1019 NR DRY 2.30

DS03 <0.1 <0.1 <0.1 <0.1 3.2 3.2 14.3 14.3 0 0 265.0 NR 1019 NR DRY 2.90

DS04 <0.1 <0.1 <0.1 <0.1 0.7 0.7 19.1 19.1 0 0 820.0 NR 1019 NR 2.78 2.83

DS05 <0.1 <0.1 <0.1 <0.1 5.3 5.3 15.0 15.0 0 0 1.9 NR 1017 NR 1.89 1.89

DS06 <0.1 <0.1 <0.1 <0.1 0.6 0.6 20.4 20.4 0 0 0.0 NR 1015 NR DRY 2.42

DS07 <0.1 <0.1 <0.1 <0.1 0.1 0.1 20.8 20.8 0 0 0.0 NR 1017 NR DRY 2.59

DS08 <0.1 <0.1 <0.1 <0.1 2.2 2.2 15.7 15.7 0 0 889.0 NR 1016 NR 2.05 2.56

End

Time NR NR

Client Amazon UK Services LimitedRecorded by CW

Pressure (mb) 1017

Site Name Foundry Point, Widnes Job number 18-0599.02WEATHER Start

1015

Wind speed (m/s) NR NR

Date (DD/MM/YYYY) 13/06/2018 Wind Dir. (from) NR NR

18.00

Readings at start CH4 (% v/v) CO2 (% v/v) O2 (% v/v) H2S (ppm) Dry/Rain/Snow/Ice Dry Dry

Gas Analyser Visit Number 2 Temperature (°C) 18.00

Ref

GROUND GAS GROUNDWATER

General comments

Dep

th t

o f

ree

pro

du

ct

Dep

th t

o w

ate

r

Dep

th t

o b

ase

Stead

y

l/hr % v/v % v/v

Flow CH4

Atm

os.

Pre

ssu

re

Max

Stead

y

Max

Stead

y

Min

Stead

y

Notes


CO2 O2 H2S CO VOC

% v/v ppm

Dif

fere

nti

al

(Rela

tive)

Pre

ssu

re

mb


Max

Max

Max

Max mb

RisingRising/Falling Trend (for the


Document No. C101 Version: 1.1 Issue Date: 11/07/17 Author: J Rhoades / S Steele Authorised By:K Hughes


NR NR NR NR



Notes


CO2 O2 H2S CO VOC

% v/v ppm

Dif

fere

nti

al

(Rela

tive)

Pre

ssu

re

Ref


General comments

Dep

th t

o f

ree

pro

du

ct

Dep

th t

o w

ate

r

Dep

th t

o b

ase

l/hr % v/v % v/v

Flow CH4

Atm

os.

Pre

ssu

re

NR

NR

Readings at start CH4 (% v/v) CO2 (% v/v) O2 (% v/v) H2S (ppm) Dry/Rain/Snow/Ice Rain Rain

Gas Analyser Visit Number 3 Temperature (°C) NR

End

Time NR NR

Client Amazon UK Services LimitedRecorded by CW

Pressure (mb) 1019


1017


Date (DD/MM/YYYY) 20/06/2018 Wind Dir. (from) NR

m m m

DS01 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 19.5 19.5 0 0 334.1 NR 1018 NR 1.68 2.87

DS02 <0.1 <0.1 <0.1 <0.1 0.6 0.6 20.1 20.1 0 0 0.0 NR 1017 NR DRY 2.29

DS03 <0.1 <0.1 <0.1 <0.1 4.1 4.1 12.4 12.4 0 0 375.6 NR 1017 NR DRY 2,1

DS04 <0.1 <0.1 <0.1 <0.1 0.2 0.2 20.5 20.5 0 0 413.7 NR 1016 NR 2.74 2.83

DS05 <0.1 <0.1 <0.1 <0.1 6.4 6.4 14.6 14.6 0 0 233.7 NR 1019 NR DRY 1.89

DS06 <0.1 <0.1 <0.1 <0.1 0.6 0.6 19.7 19.7 0 0 0.7 NR 1017 NR DRY 2,42

DS07 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 20.3 20.3 0 0 19.1 NR 1018 NR DRY 2.60

DS08 <0.1 <0.1 <0.1 <0.1 1.0 1.0 17.8 17.8 0 0 422.8 NR 1017 NR 2.05 2.54



Notes


mb


Max

Max

Max

Max mb

Max

Stead

y

Max

Stead

y

Min

Stead

y

Ref

Dep

th t

o f

ree

pro

du

ct

Dep

th t

o w

ate

r

Dep

th t

o b

ase

Stead

y

NR NR NR NR



Notes


CO2 O2 H2S CO VOC

% v/v ppm

Dif

fere

nti

al

(Rela

tive)

Pre

ssu

re

Ref


General comments

Dep

th t

o f

ree

pro

du

ct

Dep

th t

o w

ate

r

Dep

th t

o b

ase

l/hr % v/v % v/v

Flow CH4

Atm

os.

Pre

ssu

re

NR

28.00

Readings at start CH4 (% v/v) CO2 (% v/v) O2 (% v/v) H2S (ppm) Dry/Rain/Snow/Ice Dry Dry

Gas Analyser Visit Number 4 Temperature (°C) 27.00

End

Time 11:35 13:00

Client Amazon UK Services LimitedRecorded by DK

Pressure (mb) 1025


1024


Date (DD/MM/YYYY) 26/06/2018 Wind Dir. (from) NR

m m m

DS01 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 19.6 19.7 0 0 21.3 NR 1025 NR 1.91 3.00

DS02 <0.1 <0.1 0.1 0.1 1.9 1.1 18.5 18.7 0 0 0.0 NR 1025 NR DRY 2.37

DS03 <0.1 <0.1 <0.1 <0.1 3.6 3.6 19.9 14.5 0 0 41.0 NR 1025 NR DRY 2.93

DS04 <0.1 <0.1 <0.1 <0.1 0.1 0.1 18.4 20.7 0 0 0.0 NR 1025 NR 2.82 2.87

DS05 <0.1 <0.1 <0.1 <0.1 3.2 3.2 17.9 17.9 0 0 0.3 NR 1025 NR DRY 2.00

DS06 0.2 0.1 <0.1 <0.1 0.4 0.4 20.1 21.2 0 0 0.0 NR 1024 NR DRY 2.50

DS07 0.1 0.1 <0.1 <0.1 0.2 0.2 17.9 20.7 0 0 0.0 NR 1024 NR DRY 2.68

DS08 0.1 <0.1 <0.1 <0.1 2.0 1.9 16.3 16.3 0 0 0.0 NR 1024 NR 2.15 2.57



Notes


mb


Max

Max

Max

Max mb

Max

Stead

y

Max

Stead

y

Min

Stead

y

Ref

Dep

th t

o f

ree

pro

du

ct

Dep

th t

o w

ate

r

Dep

th t

o b

ase

Stead

y

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