Groundwater Report - kentenviropower.fccenvironment.co.uk · Groundwater Report May 2020 4557/R/010/02 Allington Landfill Groundwater Report Closure Report Appendix May 2020 Carried

May 2020

4557/R/010/02

Allington Landfill

Groundwater Report Closure Report Appendix Prepared for:

FCC Environment (UK) Limited

FCC Environment (UK) Limited Groundwater Report

May 2020 4557/R/010/02

Allington Landfill

Groundwater Report

Closure Report Appendix

May 2020

Carried Out For:

FCC Environment (UK) Limited

Ground Floor West 900 Pavilion Drive Northampton Business Park Northampton NN4 7RG Telephone: 01604 826200

Prepared By:

Bold Business Centre Bold Lane

Sutton St. Helens WA9 4TX

Telephone: 01925 291111

Allington Landfill Groundwater Report

May 2020 4557/R/010/02

DOCUMENT INFORMATION AND CONTROL SHEET

Document Status and Approval Schedule

Report No. Title

4557/R/010/02 Allington Landfill: Groundwater Report

Issue History

Issue Status Date Contributors Signature Date

1 Issued For Review

April 2020

Prepared By: Phil Roberts

17/04/2020

Checked By: John Baxter

24/04/2020

Approved by: John Baxter

04/05/2020

2 Issued for EA discussion

May 2020

Prepared By: Phil Roberts

15/05/2020

Checked By: John Baxter

15/05/2020

Approved by: John Baxter

15/05/2020

DISCLAIMER

This consultancy contract was completed by TerraConsult Ltd on the basis of a defined programme and scope of works and terms and conditions agreed with the client. This report was compiled with all reasonable skill, and care, bearing in mind the project objectives, the agreed scope of works, the prevailing site conditions, the budget, the degree of manpower and resources allocated to the project as agreed. TerraConsult Ltd cannot accept responsibility to any parties whatsoever, following the issue of this report, for any matters arising which may be considered outwith the agreed scope of works. This report is issued solely to the client and TerraConsult cannot accept any responsibility to any third parties to whom this report may be circulated, in part or in full, and any such parties rely on the contents at their own risk.


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CONTENTS

1. INTRODUCTION ..................................................................................................................... 1

1.1 Background ...................................................................................................................... 1

2. SITE SETTING ........................................................................................................................ 2

2.1 Site Location and Topography .......................................................................................... 2

2.2 Geology ............................................................................................................................ 2

2.3 Hydrology ......................................................................................................................... 3

2.4 Hydrogeology ................................................................................................................... 3

2.5 Waste Source Term .......................................................................................................... 6

2.6 Pollution Control Measures ............................................................................................... 7

2.7 Landfill Leachate ............................................................................................................... 7

3. CONCEPTUAL SITE MODEL ................................................................................................. 9

3.1 Leachate Source Term ..................................................................................................... 9

3.2 Pathways .......................................................................................................................... 9

3.3 Receptors ....................................................................................................................... 10

4. RISK ASSESSMENT ............................................................................................................. 11

4.1 Impacts on Groundwater ................................................................................................. 11

4.2 Groundwater Uncertainties ............................................................................................. 12

4.3 Leachate Impacts and Completion Criteria ..................................................................... 13

5. Conclusions ......................................................................................................................... 14

5.1 Overview ......................................................................................................................... 14

5.2 Groundwater ................................................................................................................... 14

5.3 Conclusion ...................................................................................................................... 14

DRAWINGS WA0640032A Geology Cross Section CW280J/100/SUR As-Built Survey April 2002 (May Gurney) APPENDICES Appendix A Borehole Logs Appendix B Groundwater Level Data Appendix C Groundwater quality Data TABLES Table 1: Summary of Local Geology ........................................................................................... 2 Table 2: Long-term Annual Average Rainfall (mm) for East Malling ......................................... 3 Table 3: Groundwater Level Data Summary (mAOD) ................................................................. 4 Table 4: Groundwater Data Summary ......................................................................................... 5 Table 5: Summary of Leachate Migration and Attenuation Process ......................................... 9


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1. INTRODUCTION

1.1 Background

1.1.1 This Appendix is an update to the Allington Landfill Site Application to Surrender Environmental Permits Report (1776/R/036/1) submitted to the Environment Agency in 2016. It updates the aspects relating to groundwater and leachate. A separate appendix addresses landfill gas.

1.1.2 Section 2 describes the site setting. This includes the sites geology, hydrogeology and groundwater levels and quality.

1.1.3 Section 3 details the conceptual site model.

1.1.4 Section 4 provides a risk assessment on the impacts to groundwater.

1.1.5 Section 5 provides a conclusion.


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2. SITE SETTING

2.1 Site Location and Topography

2.1.1 Allington Landfill is located within the bounds of the former Allington Quarry approximately 3 km northwest of Maidstone, Kent and centres on National Grid Reference TQ 737 578. The site covers an area of approximately 32 hectares (Ha). The eastern 5.2 Ha area of the site is occupied by the Kent Enviropower Limited waste incinerator plant.

2.1.2 The site is bounded as follows:

North – the embankment of the M20 Motorway forms the northern site boundary, with open fields and woodlands some 200 m further north (crossed by a railway line). Junction 5 of the M20 and Highways England Coldharbour Depot are situated immediately northwest of the site. The River Medway is 380 m north east of the site.

East – the Twenty-Twenty Business Park borders the site to the east, including (north to south).

South – the Maidstone to Ashford railway runs adjacent to the southern site boundary. A Police Traffic Headquarters building is located to the southwest on the other side of London Road (A20). The Poppyfields Public House is across from St Laurence Avenue. Residential properties are located 85 m south of the site, with the nearest on Osprey Clove.

West – the A20 runs adjacent to the west of the site, with open fields further west. Residential properties are located 390 m west on E Park Road.

2.1.3 The ground level survey prepared prior to construction of the incinerator by May Gurney dated 2002 referenced CW280J/100/SUR is attached. Ground levels around the site vary between around 35 mAOD to the south and around 20 mAOD to the north. The footprint of the incinerator complex was excavated down to 15-20 mAOD, with excavated waste deposits being re-deposited in the western part of the site (the D-Shaped Field). Consequently, the central part of the site is around 28-30 mAOD while the lowest on-site ground elevation is a pond area in the northwest of the site at below 11 mAOD.

2.2 Geology

2.2.1 The geology beneath the site is understood from BGS Geological Map Sheet 288 (Maidstone) and on-site/nearby borehole logs and is summarised in Table 1.

Table 1: Summary of Local Geology

Age Group Formation Description

Inert waste - - Sandy silt with limestone and sandstone gravels, occasionally silty clay.

Head deposits (western end of site) Post-glacial unconsolidated sand and silt.

Cretaceous Bedrock

Lower Greensand Hythe Beds Sandy limestone and calcareous sand beds.

2.2.2 The base of the quarry is noted from BGS records from boreholes drilled in 1986 (Appendix

A) as being at around 10 to 12 mAOD in the eastern part of the site. This rises to 16 mOD in the south east. There is no historic survey information available to confirm whether the base of the site is 10 to 12 mAOD throughout, particularly around the southern portion of the site.


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2.3 Hydrology

2.3.1 There are two watercourses in the vicinity of the site the River Medway and balancing ponds. The River Medway flows east to west, with meanders which come within 380 m (northeast) and 630 m (north) of the site. The balancing ponds are located 70 m south. There is one on-site water body present:

A pond in the northwestern part of the site (D-shaped field) was constructed as part of the final landscaping of the site after construction of the incinerator. This pond replaced one that was present in the same general area when the site was an active quarry as shown on the 2001 Enviros Aspinwall site survey referenced WA0640026A (attached). This pond receives good quality surface water run-off via a drain from the incinerator site further east, with poorer quality run-off being discharged to the foul sewer system.

2.3.2 Rainfall is recorded by the Meteorological Office at East Malling1, some 3 miles west of the site. The monthly long-term average data for 1981-2010 is given in Table 2 and the long-term average annual rainfall is 647.8 mm, with an average daily rainfall of 1.77 mm.

Table 2: Long-term Annual Average Rainfall (mm) for East Malling

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

66.1 43.7 45.4 46.2 48.9 42.8 40.2 51.6 54 73.9 68.7 66.4

2.4 Hydrogeology

2.4.1 The Hythe Beds form part of the Lower Greensand Group, classified by the Agency as a Principal Aquifer capable of water supply and/or river base flow on a strategic scale (previously designated as Major Aquifer).

2.4.2 The site is located on the boundary between the Inner and Outer Source Protection Zones (SPZs I and II respectively) of the Public Water Supply (PWS) boreholes at Forstal, some 650 m north of the site, operated by Southeast Water. The deepest borehole at the Forstal PWS station reaches 129 metres below ground level (mbgl) and takes water from the permeable strata (Hythe Beds) that extend southwards beneath the River Medway. The construction details of the PWS boreholes are not known, however it is considered likely that casing has been installed through the alluvial deposits adjacent to the river to minimise the potential for deterioration of the watercourse and potential ingress of river water into the borehole (the River Medway is tidal in the vicinity of the site). This has the effect of extending the SPZs to a considerable distance to approximately 3.5 km south of the river.

2.4.3 However, due to faulting of the bedrock north of the site between the site and the river as shown in the geological section by Enviros Aspinwall drawing referenced WA0640032A (attached), it is unclear as to the degree of hydraulic continuity between the bedrock beneath the site and the PWS boreholes. The presence of the Atherfield Clay approximately 10-20 mbgl at the site may affect the groundwater flow through the Hythe Beds towards the PWS boreholes.

Groundwater Levels

2.4.4 Groundwater levels around the site have been recorded at five locations since 1996 (GW1, GW3, GW5, GW6 and GW8). Three boreholes (GW1 – GW3) were in use between 1996 and 2001. Boreholes GW4 to GW8 were drilled in 2001. A summary of the groundwater

1 https://www.metoffice.gov.uk/research/climate/maps-and-data/uk-climate-averages/u107dpz9j

https://www.metoffice.gov.uk/research/climate/maps-and-data/uk-climate-averages/u107dpz9j


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level data is given in Table 3 and the full dataset is included in Appendix B. Hydrographs for each borehole are also shown as Figure 1 in Appendix B.

Table 3: Groundwater Level Data Summary (mAOD)

Stats GW1 GW3 GW5 GW6 GW8

Count 182 144 129 130 123

Min 13.23 5.46 3.05 2.63 17.54

Mean 14.15 7.15 4.76 4.48 19.06

Max 17.47 9.56 6.62 6.49 22.42

Range 3.32 2.41 1.86 2.01 3.36

NB: data range excludes likely spurious data as highlighted in Appendix B.

2.4.5 Inferred groundwater contours based on updated mean groundwater levels (excluding likely spurious data) are likely to be similar to those originally proposed in 2012 as shown in Figure 1. Groundwater flow is likely to demonstrate a generally northward direction. Mean groundwater at the southern site boundary (GW8) is at 19.06 mAOD, although at 14.15 mAOD in the southeastern corner (GW1). The lowest on-site mean groundwater level occurs at GW5 and GW6 in the northwestern part of the site (4.48 to 4.76 mAOD).

Figure 1. Groundwater contours


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2.4.6 The observed groundwater level on the northern side of the site is lower than that shown in the geological cross section by Enviros Aspinwall referenced WA0640032A (attached). It is therefore considered likely that the water level in the on-site pond in the northwestern part of the site does not represent the water table within the Hythe Beds (i.e. the pond water is locally perched on low permeability deposits).

2.4.7 The hydraulic gradient varies from around 0.035 along the site’s western boundary (approximately 400 m) to around 0.017 along the site’s eastern boundary (approximately 400 m). The average hydraulic gradient for the site is estimated at 0.026.

2.4.8 The estimated hydraulic gradients given in Section 2.4.7 are considered quite steep, although it is unclear whether it describes the natural slope of the water table in the vicinity of the River Medway or whether there has been any artificial effect on local groundwater within the Hythe Beds as a result of the abstraction at the Forstal PWS boreholes.

2.4.9 The boreholes generally do not exhibit significant trends in groundwater level, with usually small fluctuations around the mean value shown in Table 3.

2.4.10 The base elevation of the waste deposits are expected to be 10 to 12 mAOD. Based on the groundwater contours it is likely there is no unsaturated zone (UZ) beneath the southern half of the site. A UZ will probably be present north of this line deepening to a maximum depth of 6 to 8 m thickness in the northwest corner of site (GW6).

Groundwater Quality

2.4.11 A summary of groundwater quality data provided by FCC up to August 2020 is presented in Table 4. This summary draws a comparison between groundwater quality in upgradient (i.e. sample data from GW1 and GW8) and downgradient (i.e. sample data from GW3, GW5 and GW6) of the site. The downgradient difference in concentration of the selected determinands is taken to indicate the contribution of the site, if any, to groundwater contamination.

Table 4: Groundwater Data Summary

Monitoring Location

Stats Ammoniacal

Nitrogen (N:mg/l)

Chloride (mg/l)

Conductivity (uS / cm)

pH (Lab)

Total Organic Carbon (mg/l)

Total Sulphur

(SO4:mg/l)

Upgradient Groundwater

GW1

Min <0.01 8 468 6.6 0.3 <5

Mean 0.36 14 568 7.8 2.3 16

Max 7.10 24 836 9 6.5 57

GW8

Min <0.01 18 537 6.9 0.5 104

Mean 0.15 32 810 7.5 2.4 117

Max 2.90 61 1220 8.7 10.6 142

Downgradient groundwater

GW3

Min <0.01 11 570 6.4 <0.3 102

Mean 0.19 50 824 7.6 3.4 138

Max 1.40 100 1010 8.7 8.8 177

GW5

Min <0.01 12 478 7.0 1.6 64

Mean 0.11 41 785 7.6 3.7 131

Max 1.20 68 1030 8.8 26.6 198

GW6

Min <0.01 33 545 6.9 1.0 63

Mean 0.11 47 820 7.6 2.6 114

Max 1.20 56 1000 8.8 4.4 150


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2.4.12 The data in Table 4 indicates that there is only a small difference in quality between

upgradient and downgradient groundwater – i.e. the landfill is not having a significant impact on the extant water environment. Chloride and sulphate are the determinands which show the clearest increase in concentration between up and down-hydraulic gradient from (on average) 14 mg/l to 50 mg/l chloride and 16 mg/l to 138 mg/l sulphate. Chloride concentration trends did fluctuate but were relatively stable in the long term. Long term trends also show a decline in TOC in GW6 and GW8. Chloride and sulphate levels were below the same 250 mg/l Drinking Water Standard at all locations.

2.4.13 The assessment in 2016 indicated that the downstream increases in concentration of each assessed determinand have reduced in recent years. This may suggest that the effect of the landfill site on groundwater contamination is decreasing or that dilution rates have increased due to higher groundwater flow.

2.4.14 A summary of other determinands detected in groundwater throughout the review period is included in Appendix C. It is considered that the minor difference in groundwater quality downgradient of the site (mainly in terms of chloride) is typical of that arising from an unlined, inert waste landfill. Chloride is a substance which can migrate without being attenuated by adsorption onto the geological material within an aquifer, i.e. they do not easily bind chemically with the rock matrix, and therefore migrate unretarded within the geosphere.

2.4.15 A Ground Investigation is to be carried out in 2020 at Allington Landfill site. The purpose of the ground investigation is to provide sufficient data to facilitate the proposed earthworks and surrender of the landfill permit.

2.4.16 As part of the earthworks, a groundwater monitoring boreholes will be installed to a depth of 25 mbgl. An additional, 3 monitoring boreholes will be installed as part of the Household Waste Recycling Centre (HWRC) monitoring regime. Groundwater monitoring will be conducted at these points over a 6 week period. The data collected as part of the ground investigation will be used to support the surrender of the Allington Landfill.

2.5 Waste Source Term

2.5.1 The original WDL for Allington landfill permitted deposit of ‘Waste Category A – Inert Waste’. This included:

Subsoil, Topsoil; Chalk; Clay; Sand (including clean foundry and moulding sand); Hassock; Hardcore, Brickwork, Stone, Gravel; Concrete, Plaster; and Silica, Glass, Pottery, China, Enamels, Ceramics, Mica and Abrasives.

2.5.2 The WDL specifically excluded waste materials which fell under the following broad categories:

Slowly degradable waste (e.g. wood, metal, gypsum); Putrescible or difficult wastes (e.g. waste food, sewage sludge or materials

contaminated to hazardous levels); Non-special liquid waste (e.g. brewery washings, liquid abattoir wastes); Asbestos or asbestos containing waste; and


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Toxic waste (e.g. metals and metal compounds, tarry materials).

2.5.3 As the waste excavated from the Allington landfill and re-deposited in the D-Shaped Field area was that originally imported under the first WDL, the nature of the waste deposited in D-Shaped Field is expected to be identical in nature. Additional controls were imposed during excavation of the waste, with any material identified as not meeting appropriate criteria i.e. identifiable biodegradable material was to be segregated into a quarantined area for removal and disposal elsewhere. Based on site investigations it was however considered unlikely that inappropriate material would be encountered in the area of excavation for the Energy from Waste (EfW) installation, with the majority of waste comprising non-controlled waste spoil from the quarry itself.

2.5.4 Similarly, the proposed earthworks to extend the EfW installation will be excavated from Allington Landfill and re-deposited in the Household Waste Recycling Centre (HWRC) Fill Area and is expected to be identical in nature to the WDL. The same controls are to be imposed during excavation of the waste, with any material identified as not meeting appropriate criteria i.e. identifiable biodegradable material was to be segregated into a quarantined area for removal and disposal elsewhere. Further details are provided in the Appendix: Method Statement.

2.5.5 The degradable component of the wastes specified as Category A is expected to be negligible and unlikely to generate any significant volumes of landfill gas or contaminating leachate. This is because the organic fraction of soil and made ground will predominantly consist of substances such as resins and lignins which are difficult to break down. Any readily biodegradable organic molecules will largely decompose at source prior to excavation and therefore the potential for landfill gas or leachate generation when re-deposited in the landfill will be low. The gas source term is discussed in more detail in separate appendix in the Closure Report.

2.6 Pollution Control Measures

2.6.1 No basal or side-slope low permeability engineered barriers were placed at the older Allington landfill site prior to deposit of wastes. As potential disturbance of previously deposited contaminated wastes and liberation of leachate during excavation was identified as the most significant risk to the environment, A Construction Quality Assured (CQA) sand attenuation layer with maximum permeability of 1 x 10-6 m/s was placed in the D-Shaped Field quarry void prior to deposit of waste. However as the likelihood of contaminated waste being present was inherently low and the working plan included contingencies to identify and remove contaminated material, the risk of groundwater contamination occurring was determined to be low.

2.6.2 No active / passive leachate control measures have been installed at the site during its operational phase or post-closure period. The monitoring data collected since 2002 therefore represents conditions in the site without controls applied. Due to the age of the deposits, it is very unlikely that leachate strength will increase after surrender of the permit and no additional controls will therefore be required.

2.7 Landfill Leachate

2.7.1 Leachate levels have not been actively managed at the site historically, and there are no leachate quality or level monitoring points installed in the waste. Waste acceptance controls imposed at site will have prevented deposit of waste which could generate potentially contaminating leachate.


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2.7.2 The working plan prepared by Enviros Aspinwall in 2001 to manage movement of excavated waste into D-Shaped Field described the physical properties of waste excavated from the eastern area of site. This was dominated by ‘a soft to firm, orange / brown, slightly sandy silty clay’, and, ‘a firm to stiff, light grey / brown, slightly clayey very sandy silt with fine gravel and cobble size sub-angular limestone and sandstone’. The potential pore space available for free liquid to accumulate and transit in this waste may therefore be low. If this is representative of waste deposited across the whole site then a consistent head of leachate is unlikely, with perched levels more probable. A conservative estimate of leachate quality within the site has been extrapolated from groundwater quality and is detailed in Section 4.


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3. CONCEPTUAL SITE MODEL

3.1 Leachate Source Term

3.1.1 The main pollution hazard arising from the site source term is the potential generation of landfill gas and leachate.

3.1.2 The only indication of the potential leachate source term is the permitted waste types listed in the original permit and descriptions of material detailed in Section 2.5. The low organic content of this waste is also demonstrated by the negligible quantities of landfill gas generated by the waste.

3.1.3 No direct assessment of leachate quality has been carried out on the site and therefore its current potential risk to the water environment is not known. Estimation of the source term (i.e. leachate concentration) with regard to chloride is undertaken in Section 4.1.

3.2 Pathways

3.2.1 Effective precipitation will either run off the site surface or infiltrate into the waste. Any leachate generation in the waste is likely to be a result of rainwater infiltration. In the absence of an engineered basal liner, the potential for mobilisation and migration of chemicals within the waste mass will be controlled by the potential for infiltrating water to flow downwards through and out of the base of the waste material into the saturated / unsaturated zone (UZ) beneath the site or break out laterally to flow into surrounding ground or surface water.

3.2.2 The site is located on porous and permeable geological strata (the Lower Greensand aquifer). Consequently, it is considered that the principle potential migration pathways are vertically downward through the waste mass and into the water table / via the UZ which extends some 0 to 8 m beneath the northern half of the site; or, groundwater infiltration into the waste with direct leaching of contaminants into the groundwater. In both scenarios, contaminants leached into the groundwater would migrate down the hydraulic gradient (northwards) away from the site. The active leachate migration and attenuation processes that are considered viable within the subsurface at the site are shown in Table 5.

Table 5: Summary of Leachate Migration and Attenuation Process

Process Comments

Dissolution of chemicals within waste mass into pore water.

Waste mass is uncapped and therefore there is considerable potential for significant proportion of rainfall to infiltrate into the subsurface. Infiltration of groundwater into waste will directly leach contaminants into the groundwater and migrate off site.

Migration downwards out of waste soil mass.

This process is driven by the rate of infiltration of rainfall and the passage of water vertically downwards through the waste mass and into the top of the bedrock (unsaturated zone); or, rate of groundwater flow through waste and continuation into saturated water table beneath site.

Downward vertical migration through UZ to water table.

Not considered in this assessment. It is assumed for the purposes of estimation of dilution in groundwater that the amount of effluent migrating from the waste mass is the same as that entering the saturated zone of the aquifer.

Entry into saturated zone within aquifer and dilution in groundwater beneath the site.

Potential dilution is discussed in Section 4.1.


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Process Comments

Horizontal migration within saturated aquifer towards River Medway and/or Forstal PWS abstraction boreholes.

Not considered in this assessment. More detailed assessment of the attenuation of dissolved phase contaminants would be undertaken in a more detailed HRA, if required.

3.3 Receptors

3.3.1 Two Controlled Waters receptors exist in the vicinity of the site – groundwater beneath the site in the Hythe Beds and also the nearby River Medway north of the site. Balancing Ponds?

3.3.2 Due to the presence of the Forstal PWS boreholes in the vicinity of the site, the UK Drinking Water Standards (UKDWS) are considered as relevant water quality target values to apply in the assessment of the impact of the site on the water environment.


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4. RISK ASSESSMENT

4.1 Impacts on Groundwater

4.1.1 Based on historical groundwater quality downgradient (north) of the site, it is apparent that there have been only minor effects on groundwater as it passes across the site. Based on groundwater levels, this could be through the waste to the south of site and then through the unsaturated zone (UZ) underneath the northern half. An average increase of approximately 14 mg/l average for chloride and 10 mg/l increase in sulphate has been identified in downgradient groundwater (boreholes GW3, GW5 and GW6) relative to GW8 for the duration of the monitoring period. Considering the potential for direct contact between waste and groundwater in the southern part of the site (see Section 3.2), the observed impact of the site on groundwater is considered to be small. Concentrations of chloride have generally been within UK Drinking Water Standards for the duration of the monitoring period. It is theorised that this is due to the dilution of leachate to safely consumable levels by groundwater flux.

4.1.2 It is possible to estimate the degree of dilution of any leachate migrating from the landfill in groundwater by comparing the likely volume of infiltration through the waste deposits with the estimated groundwater flux across the site to obtain an approximate dilution factor along the potential groundwater pathway. This assumes that the actual scenario of groundwater being in direct contact with the waste has not occurred and is likely to over-estimate the remaining leachable concentrations of chloride in the waste.

4.1.3 This assessment involves characterisation of the movement of water through the source-pathway-receptor system, requiring several assumptions to be made regarding the local water environment:

a) Infiltration

4.1.4 For the purpose of this assessment, the value selected for infiltration into and through the waste mass is 50% of the rainfall value (i.e. 0.885 mm/d – see Section 2.3). This is considered a highly conservative estimate (i.e. an overestimate) of the actual amount of infiltration into the subsurface at the site.

b) Flow through the waste mass

4.1.5 The waste mass has a potential area of around 268,000 m2 (based on the entire site’s size minus the area of the incinerator complex, as per Section 2.1). Based on the estimated average rainfall and infiltration values, the average daily volume of water flowing downwards through the waste mass and into the top of the unsaturated aquifer (Qinfiltration) is estimated, for the purpose of this assessment, to be 2.15 x 1010 mm3 (21.5 m3/day).

c) Seepage to the watertable

4.1.6 It is assumed, conservatively, that all the infiltrated water reaches the water table within the bedrock some >0 to 8 m below the base of the waste mass.

d) Groundwater mixing zone

4.1.7 It is assumed that the uppermost 15 m of saturated aquifer provides the zone in which any chemicals entering at the water table may be diluted by extant groundwater. This zone approximates to the total decline in groundwater level across the site, south to north.


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e) Hydraulic gradient

4.1.8 The hydraulic gradient beneath the site within the Hythe Beds aquifer is nominally estimated at 0.026 (or a fall of 2.6 m in every 100 m).

f) Hydraulic conductivity

4.1.9 The hydraulic conductivity of the Hythe Beds strata beneath the site is estimated at 0.46 m/day (5.32 x 10-6 m/s), a typical value for this aquifer according to the BGS.

g) Groundwater flow

4.1.10 Groundwater flow beneath the site is a factor of the dimensions of the aquifer through which it is flowing, the hydraulic conductivity of the aquifer material (fractured sandy limestone and sand beds) and the local hydraulic gradient. Flow volume can be calculated using Darcy’s Law (Q = k.i.a) and is based on estimated values appropriate for the Hythe Beds aquifer:

Flow volume (Qaquifer) = permeability (5.32 x 10-6 m/s) x hydraulic gradient (0.026) x area (mixing depth of 15 m x width of site along the flow direction of 1500 m).

Therefore, Qaquifer equates to: 3.11 x 10-3 m3/s, or 269 m3/d.

4.1.11 Assessment of dilution within the aquifer requires comparison of the quantity of infiltrating water (which may carry dissolved contaminants) with the quantity of groundwater flowing through the mixing zone within the underlying aquifer. The dilution factor (DF) equates to:

(Qinfiltration + Qaquifer) / Qinfiltration

Therefore, DF = (21.5 m3/d + 269 m3/d) / 21.5 m3/d = 13.5.

4.1.12 Therefore, the increase in concentration of chemicals dissolved in downgradient groundwater (i.e. compared with upgradient groundwater) can be multiplied by a DF of 13.5 to estimate the concentration within pore water within the waste mass.

4.1.13 The apparent impact of chloride which increases by around 23 mg/l beneath the site (see Section 2.4.11) is potentially attributable to a leachate concentration of around 310 mg/l.

4.1.14 The apparent impact of chloride which increases by around 61 mg/l beneath the site is potentially attributable to a leachate concentration of around 823 mg/l. based solely on dilution in groundwater.

4.1.15 It is apparent that the waste mass could contain leachate with a concentration of chloride and sulphate in excess of the 250 mg/l UKDWS for chloride and sulphate, however dilution of any fugitive leachate within groundwater is sufficient to reduce the impact of chloride and sulphate to below the UKDWS threshold as it has not been detected in quantities exceeding the UKDWS. Consequently, the site is considered not to pose a significant potential risk to the nearby Forstal PWS boreholes. The recorded increase in sulphate and chloride concentrations in the groundwater may be attributable to direct leaching as a component of the groundwater passes through the waste. If all the waste was unsaturated then it is possible that the impact of leaching derived from infiltration alone may be much lower.

4.2 Groundwater Uncertainties

4.2.1 The estimates of waste leachate source term for chloride and sulphate given in Sections 4.1.6 and 4.1.7 respectively should be considered tentative assessments of the composition of source concentration for these determinands.


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4.2.2 The dilution calculation is primarily dependent on the volume of rainfall that infiltrates into the subsurface within the site and the assumed value of 50% infiltration is considered likely to be high (i.e. to exceed that which actually occurs).

4.2.3 Reduction in the volume of infiltration will increase the dilution factor, assuming the same rate of groundwater flow beneath the site. This has the effect of increasing the potential leachate concentration without causing higher than the observed downgradient groundwater quality.

4.2.4 For example, if infiltration is 25% of rainfall (i.e. 0.4 mm/day), the dilution factor will approximately double to 27, thereby allowing double the estimated leachate concentration for chloride and sulphate (and other landfill-derived determinands).

4.2.5 Variation in the hydraulic conductivity of the aquifer will also proportionately affect the dilution factor.

4.2.6 It may be that the increase in concentration down gradient of site may be primarily attributable to direct leaching of the waste by groundwater. If this is the case, infiltration derived leaching of chloride and sulphate may not have caused an observable increase in concentration down gradient of the site at all.

4.2.7 Another factor that is not included in this assessment is the potential degree of attenuation of landfill-derived chemicals within the unsaturated and saturated zones within the bedrock. If attenuation processes such as adsorption and dispersion are active, a higher concentration of mobile (i.e. leachable) chemicals could be present in the waste leachate. However, this is considered unlikely due to the relatively thin or absent unsaturated zone present beneath the base of the waste deposits (i.e. the unsaturated zone has been reduced by historical mineral extraction).

4.3 Leachate Impacts and Completion Criteria

4.3.1 There is no completion criteria specified in the permit for leachate quality, however there is also no leachate quality to compare against any such criteria. The limitation of waste deposits to inerts in the permit and available groundwater quality data indicates that the site is having no detrimental impact on groundwater quality without the installation of active or passive controls. The pollution potential of the source term is also likely to continue to decline, so it is considered that leachate quality completion criteria has already been achieved.


May 2020 14 4557/R/010/02

5. Conclusions

5.1 Overview

5.1.1 Allington Quarry Landfill ceased taking waste in 2002 having formerly accepted waste types classified as inert. BGS borehole records indicate waste deposits to be sandy silt with limestone and sandstone gravels, occasionally silty clay. Permit EPR/HP3695HS/N002: D-Shaped Field was successfully surrendered in 2016. The operator now intends to surrender the permit EPR/NP3398HR/V002: Allington under Regulation 25(2) of the Environmental Permitting (England and Wales) Regulations 2016 (as amended).

5.1.2 Pursuant to making a successful surrender application, a thorough review has been made of the conceptual site model. This has taken into account the:

pollution source term (the waste); potential emissions from the waste (landfill gas and leachate); potential pathways by which any emissions might reach sensitive receptors

(through the ground, over land and via ambient air); and, identification of potentially sensitive receptors (surface water, adjacent

buildings & habitats).

5.2 Groundwater

5.2.1 The assessment of the likely impact of the landfill on groundwater in this report indicates that the landfill is unlikely to pose a significant potential risk to the local water environment, despite an apparent potential for direct contact between waste and groundwater in the southern part of the site. This conclusion is based on the known downgradient groundwater quality (exhibiting minimal variation from upgradient chemical composition) and the likely high degree of dilution within the aquifer of any discharge of leachate through the base of the landfill.

5.2.2 The low risk inert nature of waste source term means that there was no control imposed on leachate levels or leachate quality in the waste after deposit. The assessment of groundwater impacts therefore represents a post-surrender scenario where such controls (if present) would be absent. The already limited pollution potential of the leachate source term will continue to decline with time and the risk to groundwater reducing commensurately.

5.2.3 It is therefore concluded that the waste permit can be surrendered without the need for additional detailed hydrogeological risk assessment, subject to confirmation by the Environment Agency.

5.3 Conclusion

5.3.1 Due to the low risk inert nature of the wastes deposited at the site, leachate within the site has never been actively or passively controlled. All monitoring data collected since 2002 therefore reflects a post-surrender scenario where such controls would have been switched off. It is evident that controls are not needed to reduce the risk presented by the landfill leachate and the risk will also continue to decline. The need to regulate the site to ensure appropriate controls are in place to manage pollution are no longer necessary and the environmental permit can now be surrendered.


May 2020 4557/R/010/02

DRAWINGS

ssw NNE

---- Sandgate beds

FolkstoneBeds

,

ForstalPumpingStation

RiverMedway(tidal)

7

Sitt

AA12(projected)

Hythe Beds

AA 11b

7/s~/

7

GravelPondinquarry

Atherfield Clay

Hythe Beds

Monocline observed ~~"'-------'"'-"'-------'"'--~r-- _inquarryin 1980(projected ontothis section)

o

Atherfield Clay

20

40

------.%,Hythe~s- --

-60

0

~ -20£~0~

~

-40

-.

Is0:

1500I

Distance in metres

1250I

1000I

750I

500I

rmsteIJ SCAl£ AS SHOWN WA0640032A ALLINGTON WASTEr(1"!!9 MANAGEMENT FACILITY

CONTENT SLH DRAWN JSF FIGURE 10

ENVIROS GEOLOGYCHECKED DATE AUG 2001 CROSS SECTIONS

Io1aMedge movallOO soUlons

250I

- - - -L. - _ _ Approximate elevationof watertable

-80

KEY:

'ie:

!Jalali totheNNEof therailway is taken from Figure 8 (Reference1).Quarrydetails taken from topographic surveysupplied by Wellden LandSurveys. MOl . MOB andAA13 are 1980 siteinvestigation boreholes.Una of sectionthrough quanyshown on Figure 9.


May 2020 4557/R/010/02

APPENDIX A

Report an issue with this borehole

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May 2020 4557/R/010/02

APPENDIX B

0

5

10

15

20

25

30

10/01/2011 10/01/2012 10/01/2013 10/01/2014 10/01/2015 10/01/2016 10/01/2017 10/01/2018 10/01/2019 10/01/2020

Groundwater Levels (mAOD)

GW 1

GW 3

GW 5

GW 6

GW 8

Date GW 1 GW 3 GW 5 GW 6 GW 8

06/03/1996 14.52 6.89

28/03/1996 14.42 6.84

30/04/1996 14.27 6.54

17/05/1996 14.17 6.39

13/06/1996 14.17 6.39

29/07/1996 14.07 6.19

28/08/1996 14.12 6.39

24/09/1996 14.07 6.19

23/10/1996 14.01 6.14

20/11/1996 14.16 7.83

10/12/1996 14.26 7.15

17/01/1997 14.16 6.58

12/02/1997 14.15 6.30

07/03/1997 14.08 6.81

04/04/1997 14.08 6.29

02/05/1997 14.09 6.30

13/06/1997 14.01 6.14

16/07/1997 14.19 6.95

13/08/1997 14.16 6.65

05/09/1997 14.16 6.63

03/10/1997 14.01 6.23

19/01/1998 14.71 8.62

21/02/1998 14.32 7.74

26/03/1998 14.17 7.24

20/04/1998 14.19 7.64

15/05/1998 14.23 7.43

29/06/1998 14.10 7.26

15/07/1998 14.05 6.92

25/08/1998 14.09 6.65

15/09/1998 14.11 6.78

27/10/1998 14.19 7.04

16/11/1998 14.37 7.89

03/12/1998 14.26 7.49

29/01/1999 14.44 8.28

24/02/1999 14.33 7.94

22/03/1999 14.17 7.44

22/04/1999 14.12 7.23

19/05/1999 14.11 7.02

18/06/1999 14.09 6.97

29/07/1999 14.04 6.74

27/08/1999 14.12 7.19

13/09/1999 13.97 6.74

15/10/1999 14.09 6.90

11/11/1999 14.15 6.76

08/12/1999 14.06 6.77

19/01/2000 14.27 7.53

24/02/2000 14.12 7.04

15/03/2000 14.08 7.14

12/04/2000 14.08 7.13

11/05/2000 14.24 7.37

14/06/2000 14.47 7.82

25/07/2000 14.13 7.47

03/08/2000 14.10 7.33

19/09/2000 14.04 6.88

23/10/2000 14.46 8.44

21/11/2000 15.02 9.02

12/12/2000 15.00 9.04

10/01/2001 15.19 9.12


27/02/2001 17.47 9.56

27/03/2001 15.67 9.24

11/04/2001 16.38 9.23

11/05/2001 14.52 8.84

07/06/2001 14.37 8.00

02/07/2001 14.30 7.60

10/08/2001 14.29 7.33

06/09/2001 14.27 7.34

24/10/2001 14.49 8.44

30/10/2001 14.37 8.22

07/11/2001 14.42 8.25 5.00 3.34

14/11/2001 14.39 8.05 4.86 4.20

23/11/2001 14.38 7.88 4.65 4.02

29/11/2001 14.39 8.14 4.58 3.92

17/12/2001 14.29 7.72 4.51 3.79

09/01/2002 14.22 7.49 5.31 3.67 18.55

05/02/2002 14.36 7.79 5.25 4.24 19.38

14/03/2002 14.33 8.05 6.04 4.60 20.36

02/05/2002 14.39 7.54 4.49 3.84 19.56

07/06/2002 14.39 7.54 2.97

02/07/2002 14.13 7.20 3.57

27/08/2002 14.16 7.24 4.03 3.47 18.34

10/09/2002 14.17 7.64 6.34 4.22 18.32

15/10/2002 14.11 6.84 3.89 3.32 17.97

13/11/2002 14.16 8.30 6.38 4.29 18.31

12/12/2002 14.44 8.20 4.60 3.84 19.05

21/01/2003 15.16 9.40 6.44 5.22 22.42

12/02/2003 14.49 8.76 5.64 4.60 21.09

12/03/2003 14.27 8.10 4.91 4.09 20.45

01/04/2003 14.27 7.66 4.61 4.70 19.92

07/05/2003 14.12 7.29 4.30 3.66 19.20

25/06/2003 14.45 6.91 4.04 3.45 18.44

09/07/2003 14.06 6.80 4.00 3.39 18.38

27/08/2003 14.01 6.44 3.80 3.21 17.96

17/09/2003 13.99 6.37 3.74 3.16 17.88

02/10/2003 14.02 6.34 3.71 3.14 17.90

12/11/2003 13.98 6.31 3.73 3.11 17.83

04/12/2003 14.18 7.40 4.18 3.44 18.70

07/01/2004 14.23 7.63 4.55 3.66 18.58

04/02/2004 14.35 7.85 4.61 3.82 19.05

24/03/2004 14.17 7.24 4.23 3.58 19.26

16/04/2004 14.00 6.94 4.45 3.76 19.17

07/05/2004 14.08 7.99 4.70 3.84 19.32

21/05/2004 13.91 7.19 4.36 3.31 19.15

11/06/2004 14.03 7.05 4.31 3.63 18.84

02/07/2004 6.67 4.25 3.47 18.93

29/07/2004 13.96 6.84 4.29 3.55 18.69

11/08/2004 13.97 6.71 4.30 3.53 18.56

04/10/2004 13.94 6.63 4.17 3.39 18.30

26/10/2004 13.96 7.07 4.94 3.73 18.61

24/11/2004 14.00 6.75 4.65 3.63 18.44

22/12/2004 14.05 6.90 5.45 3.98 18.44

19/01/2005 14.00 6.95 4.70 3.73 18.39

23/02/2005 14.00 6.70 4.95 3.63 18.04

16/03/2005 14.00 6.85 4.40 3.63 18.49

13/04/2005 14.10 6.70 4.15 3.43 18.34

11/05/2005 14.00 6.95 4.15 3.43 18.44

14/06/2005 14.00 6.65 4.05 3.38


13/07/2005 14.02 5.46 4.00 3.33 18.14

01/09/2005 14.00 6.55 4.00 3.33 18.19

30/09/2005 13.97 4.02 3.33 18.05

14/10/2005 14.03 4.70 2.63 17.54

16/11/2005 14.01 4.61 3.73 18.24

21/12/2005 13.98 4.26 3.48 18.34

25/01/2006 13.94 6.43 4.19 3.42 17.89

27/02/2006 13.89 6.67 5.69 4.02 18.20

30/03/2006 13.86 6.34 4.14 3.32 18.28

27/04/2006 13.96 6.76 4.49 18.79

23/05/2006 13.99 5.09 4.97 18.69

30/06/2006 14.18 5.18 5.28 18.88

27/07/2006 13.97 4.03 4.57 18.39

04/09/2006 14.02 4.30 4.70 18.60

15/09/2006 13.88 4.53 4.70 18.44

12/10/2006 13.93 5.62 5.17 18.75

16/11/2006 13.89 4.97 4.94 18.49

14/12/2006 14.02 5.82 5.33 18.68

05/01/2007 14.09 5.97 5.27 19.13

16/02/2007 14.17 5.91 5.46 19.28

14/03/2007 14.19 6.02 5.72 20.34

19/04/2007 14.05 5.58 5.45 20.37

21/05/2007 13.95 4.98 5.15 19.63

27/06/2007 14.00 4.78 4.98 19.22

18/07/2007 14.02 4.62 5.04 18.90

09/08/2007 4.95 4.98 18.93

27/09/2007 4.79 4.97 18.83

08/10/2007 13.93 4.73 5.31 18.94

12/11/2007 13.88 4.12 4.57 18.28

21/12/2007 13.84 4.08 4.71 18.23

28/01/2008 13.99 4.14 4.78 18.32

28/02/2008 14.00 5.01 4.87 18.72

18/03/2008 13.99 5.04 4.93 18.78

28/04/2008 14.02 5.12 4.95 18.83

19/05/2008 13.97 5.09 4.97 18.86

30/06/2008 13.89 4.99 4.93 18.82

05/08/2008 13.99 4.85 4.94 18.94

19/08/2008 14.02 5.11 5.02 19.10

11/09/2008 13.99 5.11 5.00 19.04

29/10/2008 5.24 5.06 19.07

13/01/2009 13.99 4.70 4.85 19.38

09/03/2009 13.84 4.64 4.76 19.25

22/04/2009 13.79 4.59 4.72 19.18

28/05/2009 13.72 4.61 4.75 19.14

29/06/2009 13.62 4.54 4.70 19.03

28/05/2009

31/05/2009

29/06/2009

17/07/2009 13.47 4.61 4.76 18.95

30/09/2009 13.55 4.54 4.72 18.81

28/10/2009 13.47 4.59 4.65 18.75

30/11/2009 13.41 4.54 4.58 18.68

25/02/2010 13.36 4.57 4.62 18.46

16/03/2010 6.46 6.12 22.25

07/04/2010 6.08 5.70 22.18

10/05/2010 5.89 5.55 20.39

07/06/2010 5.08 5.74 21.30

19/07/2010 5.08 4.91 19.28


13/08/2010 6.08 6.49 21.19

03/09/2010 5.62 5.45 20.04

08/10/2010 4.70 4.87 19.03

25/11/2010 4.65 4.85 18.87

20/12/2010 5.89 4.94 18.72

10/01/2011 14.07 5.67 5.17 18.84

03/02/2011 14.24 7.73 5.84 5.43 20.26

28/03/2011 13.98 7.16 5.23 5.17 20.04

12/04/2011 13.96 7.13 4.91 5.05 19.86

04/05/2011 13.96 6.94 4.62 4.91 19.56

02/06/2011 13.85 6.56 4.42 4.77 18.94

13/07/2011 13.89 6.45 4.38 4.69 18.78

11/08/2011 13.92 6.27 4.30 4.60 18.69

21/09/2011 13.83 6.18 4.19 4.55 18.36

06/10/2011 6.16 4.21 4.53 18.34

17/11/2011 13.81 6.09 4.15 4.52 18.24

08/12/2011 13.81 6.09 4.28 4.53 18.16

31/01/2012 6.23 4.04 4.46 18.07

29/02/2012 5.93 3.96 4.37 17.90

28/03/2012 13.81 5.80 3.88 4.37 17.78

11/04/2012 13.87 5.68 3.83 4.33 17.7522/05/2012 14.11 6.82 4.6 4.76 17.920/06/2012 14.36 7.36 5.31 5.05 19.2503/07/2012 7.17 4.66 4.76 18.8330/08/2012 14.02 6.89 4.48 4.69 18.7719/09/2012 14.04 6.63 4.32 4.62 18.5931/10/2012 13.78 7.41 3.69 4.86 18.7613/11/2012 14.1 7.36 5.36 5.11 19.4413/12/2012 14.07 7.35 5.32 5.13 19.2413/01/2013 14.07 7.35 5.32 5.13 19.2427/02/2013 14.11 7.29 5.79 4.21 19.3228/03/2013 14.36 7.24 5.62 12.1622/04/2013 14.78 6.66 5.5 12.2530/05/2013 13.2 7.1 5.27 5.21 20.1227/06/2013 12.2 6.59 5.66 5.33 19.5807/08/201312/09/201313/09/201326/09/2013 13.84 5.89 6.1 20.3207/11/2013 7.63 6.18 5.56 2025/11/2013 14.3 7.35 5.75 5.29 19.7127/11/201318/12/2013 14.2 5.63 5.16 19.4117/01/2014 16.8 6.67 6.72 23.4724/02/2014 18.71 7.03 7.45 24.5431/03/201417/04/2014 14.22 7.81 6.16 5.95 21.0614/05/2014 14.2 7.48 5.75 5.49 20.3219/05/201425/06/201427/06/2014 14.04 6.97 4.85 5.01 19.5809/07/2014 14.09 6.82 4.55 4.88 19.4329/08/2014 14.11 6.9 4.83 19.3210/09/2014 13.95 6.8 4.35 4.73 19.0423/10/2014 14.04 6.99 4.43 4.77 19.1206/11/2014 14.04 6.8 4.4 4.7 18.8610/12/2014 14.16 7.33 4.2 4.94 19.2522/01/2015 14.28 7.6 5.68 5.31 19.76


05/02/2015 14.29 7.49 5.06 5.08 19.94

11/03/2015 14.18 7.42 5.3 5.23 20.21

09/04/2015 14.16 7.22 5.15 5.17 20.21

13/05/2015 14.13 7 4.61 4.94 19.77

05/06/2015 14.20 6.93 4.54 4.87 19.82

10/07/2015 14.10 6.44 4.29 4.71 19.11

07/08/2015 14.08 6.45 4.24 4.66 18.86

18/09/2015 14.06 6.4 4.51 4.67 18.77

09/10/2015 14.12 6.55 4.21 4.61 18.68

05/11/2015 14.13 6.39 4.18 4.55 18.57

03/12/2015 14.07 6.53 4.22 4.6 18.55

08/01/2016 14.23 6.9 6.16 4.96 19.4

05/02/2016 14.33 7.09 5.72 5.32 20.07

04/03/2016 14.19 7.41 5.3 5.17 20.3

08/04/2016 14.19 7.42 5.5 5.27 20.39

12/05/2016 14.17 7.12 4.84 5.03 20.16

14/06/2016 14.14 7.3 4.88 5.06 19.34

08/07/2016 14.16 7.9 5.84 5.39 20.28

03/08/2016 14.23 7.25 5.01 4.98 19.74

08/11/2016 13.70 6.17 4.4 4.65 18.63

09/02/2017 14.00 6.58 4.99 4.92 19.08

25/05/2017 13.86 6.48 4.57 4.72 19.05

04/08/2017 14.13 7.45 4.47 4.68 19.4

10/11/2017 14.07 6.24 4.15 4.44 18.23

09/02/2018 14.29 7.17 4.79 4.91 18.98

03/05/2018 14.40 7.9 3.05 3.6 20.92

09/08/2018 13.23 6.61 4.58 4.75 19.3

14/11/2018 14.20 6.65 5.27 5.91 19.48

28/02/2019 13.28 7.05 4.55 4.91 18.99

29/06/2019 14.06 4.58 4.79 19.45

29/08/2019 13.74 6.8 4.33 4.57 18.74

19/12/2019 14.60 7.2 4.56 4.71 19.49

25/02/2020 15.09 8.78 6.62 6.24 21.6

GW 1 GW 3 GW 5 GW 6 GW 8

Count* 236 144 129 130 123

Min* 12.20 5.46 3.05 2.63 17.54

Mean* 14.16 7.15 4.84 4.67 19.17

Max* 18.71 9.56 7.03 12.25 24.54

Range* 4.55 2.41 2.19 7.58 5.37

* excluding possibly spurious data (greyed out)


May 2020 4557/R/010/02

APPENDIX C

0

20

40

60

80

100

120

0

200

400

600

800

1000

1200

Concentra

tion m

g/l

Concentr

ation (

us/c

m)

Date

Groundwater Quality in GW1


Total Sulphur (SO4:mg/l)

Ammoniacal Nitrogen (N:mg/l)

Chloride (mg/l)

pH (Lab)


Date

Am

monia

cal N

itro

gen (

N:m

g/l)

Chlo

ride (

mg/l)

Conductivity (

uS

/ c

m)

pH

(Lab)

Tota

l O

rganic

Carb

on (

mg/l)

Tota

l S

ulp

hur

(SO

4:m

g/l)

28/03/1996 1.01 14 545 7.6 6.2 18

14/06/1996 0.75 14 539 7.6 2.6 18

01/10/1996 0.87 560 7.5 0.9 16

10/12/1996 0.22 13 7.5 0.3

07/03/1997 1 16 484 7.3 1 19

13/06/1997 0.6 18 581 7.5 1.3 16

05/09/1997 1.1 13 546 6.9 1.5 19

26/03/1998 1.1 15 562 7.7 0.92 6

29/06/1998 0.3 14 571 6.6 2.35 12

15/09/1998 1.2 14 567 7.5 2.5 27

03/12/1998 0.5 12 565 7.5 2.8 13

24/03/1999 0.8 17 542 7.6 2.4 5

18/06/1999 0.9 16 475 2.6 24

13/09/1999 0.8 16 537 7.5 3.5 7

08/12/1999 0.4 16 561 8.2 3.3 16

15/03/2000 0.6 14 541 7.4 3.6 14

14/06/2000 7.1 24 624 8.1 3.6 35

19/09/2000 0.8 15 487 7.7 1.9 21

12/12/2000 2.7 13 8.2 3 16

27/03/2001 1.3 21 602 8 4.3 44

07/06/2001 3.1 11 566 7.9 2.9 13

06/09/2001 12 528 8.3 3.4 14

30/10/2001 0.15 21 591 7.9 3.4 57

07/11/2001 0.15 17 630 7.7 3.3 29

14/11/2001 0.5 22 597 7.9 3.2 29

23/11/2001 0.6 15 544 7.7 1.2 14

29/11/2001 1.3 8 535 7.6 3.3 12

20/12/2001 1.4 11 572 9 2.1 13

09/01/2002 0.15 13 570 8.4 3.8 2.5

05/02/2002 1.1 12 548 8 2.4 13

14/03/2002 0.15 13 544 7.8 2.3 12

03/04/2002 0.15 12 512 7.8 2.1 17

07/06/2002 0.15 13 545 8 2.3 14

02/07/2002 0.4 12 532 7.43 2.1 13

27/08/2002 0.15 11 836 7.7 2.6 7

17/09/2002 0.15 11 468 8.4 3.9 12

15/10/2002 0.15 12 512 8 2.7 16

13/11/2002 0.7 13 536 8 3.6 12

12/12/2002 0.4 12 504 8.4 3.2 12

21/01/2003 0.3 11 580 8.6 2.7 11

12/02/2003 0.7 14 548 7.8 0.8 14

12/03/2003 0.2 13 568 7.1 2 12

01/04/2003 0.04 14 622 8.7 1.5 12

07/05/2003 0.02 13 529 8.6 1.9 10

25/06/2003 0.02 12 536 7.6 1.5 12

09/07/2003 0.02 12 561 7.8 3.1 15

GW1

Date

Am

monia

cal N

itro

gen (

N:m

g/l)

Chlo

ride (

mg/l)

Conductivity (

uS

/ c

m)

pH

(Lab)

Tota

l O

rganic

Carb

on (

mg/l)

Tota

l S

ulp

hur

(SO

4:m

g/l)

GW1

27/08/2003 0.02 14 535 7.5 2.9 13

17/09/2003 0.02 13 537 8.5 3 12

02/10/2003 0.02 13 549 7.7 1.9 12

12/11/2003 0.02 15 540 8.3 1.5 8

04/12/2003 0.02 11 546 8.6 1.7 13

07/01/2004 0.02 10 541 7.6 2.4 13

04/02/2004 0.02 11 590 7.8 2.8 13

24/03/2004 0.05 12 535 7.7 3.1 8

28/05/2004 0.02 15 544 7.5 2.3 12

16/06/2004 0.02 11 504 8 2.1 12

29/07/2004 1.1 12 551 7.7 2.3 11

11/08/2004 1 10 560 7.8 1.9 13

04/10/2004 0.9 12 553 7.9 2.8

26/10/2004 0.15 11 547 7.8 2.7

24/11/2004 0.5 12 551 7.6 2.4 14

22/12/2004 0.15 13 601 7.8 2.9

19/01/2005 0.15 11 517 7.3 3

23/02/2005 0.15 18 504 7.8 1.9 14

16/03/2005 0.4 12 564 7.8 1.6

13/04/2005 0.15 2.6

11/05/2005 0.02 12 562 8 2.4 24

14/06/2005 0.02 11 540 7.8 2

13/07/2005 0.06 11 551 7.6 2.2

01/09/2005 0.16 14 548 8 2.3 27

30/09/2005 0.02 11 552 7.5 3.5

14/10/2005 0.05 11 546 7.8 2.4

16/11/2005 0.02 13 527 7.6 2.2 23

20/12/2005 0.02 12 598 7.9 2.3

25/01/2006 0.09 18 578 7.7 3.3

27/02/2006 0.04 16 550 7.8 3.7 20

30/03/2006 0.02 21 539 8.1 6.5

27/04/2006 0.02 12 556 8.6 5

23/05/2006 0.05 20 567 8.5 3.1 15

04/09/2006 0.02 12 587 8.1 2.3

17/11/2006 0.02 14 541 8.4 1.9 15

19/02/2007 0.04 12 548 7.8 2.6

22/05/2007 0.02 12 537 7.6 2.4 14

13/11/2007 0.02 12 530 7.7 2.6 13

29/02/2008 0.02 12 528 7.4 2.4

20/05/2008 0.02 11 528 7.2 1.6 22

05/08/2008 0.02 11 524 8 2.9

10/03/2009 0.36 718 7.3 4.39 41

03/02/2011 0.01 11 570 7.8 2.7 27

04/05/2011 0.0315 13.4 530 8.36 0.989 16.5

11/08/2011 0.143 13.3 543 8.05 0.817 17.8

15/11/2011 0.0907 13.5 519 7.84 0.877 15.6

Date

Am

monia

cal N

itro

gen (

N:m

g/l)

Chlo

ride (

mg/l)

Conductivity (

uS

/ c

m)

pH

(Lab)

Tota

l O

rganic

Carb

on (

mg/l)

Tota

l S

ulp

hur

(SO

4:m

g/l)

GW1

22/05/2012 0.005 14 576 8 1.6

30/08/2012 0.005 16 607 7.9 1.7

31/10/2012 0.005 14 615 7.7 0.4

13/11/2012 0.005 14 610 8.1 0.41

27/02/2013 0.005 14 602 8.1 1.9

30/05/2013 0.005 12 586 7.7 1.3

26/09/2013 0.005 14 622 7.6 0.47

25/11/2013 0.02 13 613 7.6 0.58

14/02/2014 0.01 19 630 8 0.58

14/05/2014 0.005 13 7.6 0.44

29/08/2014 0.11 13 602 7.7 0.56

06/11/2014 0.03 14 588 7.7 0.45

05/02/2015 0.005 14 562 8.1 0.67

13/05/2015 0.005 13 610 7.4

07/08/2015 0.01 13 649 7.4

05/11/2015 0.01 13 615 7.5

05/02/2016 0.6 14 627 7.3

12/05/2016 0.005 13 625 7.6

03/08/2016 0.03 14 640 7.6

08/11/2016 0.02 14 652 7.5

09/02/2017 0.005 12 647 7.5

25/05/2017 0.07 13 621 7.4

04/08/2017 0.01 15 596 7.6

10/11/2017 0.005 13 588 7.7

09/02/2018 0.005 14 595 7.8

03/05/2018 0.02 14 609 8.2

13/08/2018 0.02 14 576 7.6 0.38

14/11/2018 0.02 13 585 7.5

28/02/2019 0.02 14 594 7.8

29/06/2019 0.02 14 601 7.7

29/08/2019 0.005 13 615 7.8

13/01/2020 0.4 13 594 7.5

25/02/2020 0.3 14 607 7.6

Min 0.01 8 468 6.6 0.3 2.5

Mean 0.36 13.6 568.2 7.8 2.3 16.5

Max 7.1 24 836 9 6.5 57

0

20

40

60

80

100

120

0

200

400

600

800

1000

1200

Concentra

tion m

g/l

Concentr

ation (

us/c

m)

Date





Chloride (mg/l)

pH (Lab)


Date

Am

monia

cal N

itro

gen (

N:m

g/l)

Chlo

ride (

mg/l)

Conductivity (

uS

/ c

m)

pH

(Lab)

Tota

l O

rganic

Carb

on (

mg/l)

Tota

l S

ulp

hur

(SO

4:m

g/l)

28/03/1996 0.32 100 810 7.7 6.4 170

14/06/1996 0.05 35 737 7.3 0.9 141

01/10/1996 0.04 739 7.2 0.9 131

10/12/1996 0.02 32 7.2 0.15

07/03/1997 0.6 34 649 7 0.8 150

13/06/1997 0.15 36 765 7.2 1.3 133

05/09/1997 0.4 32 734 6.7 0.9 131

08/12/1997 0.15 36 703 7.6 1.05 139

26/03/1998 0.9 59 892 7.2 1.93 158

29/06/1998 0.3 57 915 6.4 3.25 156

15/09/1998 0.5 39 798 7.1 2 124

03/12/1998 0.7 52 897 6.9 4.6 165

24/03/1999 0.5 61 834 7.2 3.5 147

18/06/1999 0.5 45 623 7.3 2.5 131

13/09/1999 0.15 51 722 7.3 2.8 137

08/12/1999 0.3 50 821 7.8 3.1 133

15/03/2000 0.3 55 810 7 3.6 138

14/06/2000 0.3 68 895 7.7 3.6 174

19/09/2000 0.3 63 820 7.3 2.9 172

12/12/2000 0.5 64 7.7 4.8 177

27/03/2001 0.3 63 842 7.7 5.6 169

07/06/2001 1.4 63 931 7.6 4.7 162

06/09/2001 60 837 8.3 4.1 155

30/10/2001 0.6 61 954 7.8 5.6 156

07/11/2001 0.15 59 806 7.7 5.2 158

14/11/2001 0.5 58 904 7.8 5.3 147

23/11/2001 0.4 59 886 7.4 3.2 163

29/11/2001 1.2 55 869 7.3 4.6 152

20/12/2001 0.5 59 737 8.2 3.1 154

09/01/2002 0.15 57 869 8.3 4.2 171

05/02/2002 0.3 54 888 7.9 3.5 153

14/03/2002 0.15 53 830 7.5 3.3 151

03/04/2002 0.4 56 793 7.4 3.3 143

07/06/2002 0.15 53 844 7.7 3.4 144

02/07/2002 0.5 55 837 7.51 5.3 149

27/08/2002 0.4 49 683 8.7 3.8 137

17/09/2002 0.15 44 693 7.8 4.5 129

15/10/2002 0.15 36 716 7.8 3.3 113

13/11/2002 0.7 40 754 7.7 4.8 120

12/12/2002 0.3 42 729 8 6.1 121

21/01/2003 0.15 50 802 8.3 8.8 102

12/02/2003 0.15 57 858 7.5 5.3 121

12/03/2003 0.06 56 899 7 5.4 131

01/04/2003 0.06 57 980 8.6 4.1 137

07/05/2003 0.04 55 724 7.8 6.6 125

25/06/2003 0.02 50 838 7.3 3.8 130

GW3

Date

Am

monia

cal N

itro

gen (

N:m

g/l)

Chlo

ride (

mg/l)

Conductivity (

uS

/ c

m)

pH

(Lab)

Tota

l O

rganic

Carb

on (

mg/l)

Tota

l S

ulp

hur

(SO

4:m

g/l)

GW3

09/07/2003 0.02 36 792 7.5 3.3 116

27/08/2003 0.02 38 753 7.2 2.6 120

17/09/2003 0.02 42 774 8.3 3 120

02/10/2003 0.29 47 806 7.3 3.2 135

12/11/2003 0.02 36 730 8 2 114

04/12/2003 0.02 59 879 8.2 5.9 140

07/01/2004 0.02 55 877 7.3 6.5 132

04/02/2004 0.02 36 1010 7.4 8.6 144

24/03/2004 0.02 57 863 7.4 6.1 133

28/05/2004 0.22 64 908 7.2 8.1 139

16/06/2004 0.02 58 915 7.8 4.7 140

29/07/2004 0.4 57 874 7.2 4.7 123

11/08/2004 0.6 38 808 7.4 2.7 117

04/10/2004 0.6 42 804 8.5 2.1

26/10/2004 0.15 51 837 7.3 4

24/11/2004 0.4 53 815 7.2 3.9 115

22/12/2004 0.15 53 848 7.4 3.9

19/01/2005 0.15 56 766 7.4 3.8

23/02/2005 0.15 48 726 7.5 2.9 120

16/03/2005 0.15 49 829 7.6 3.5

13/04/2005 0.15 1.3

11/05/2005 0.02 45 792 8 2.6 116

14/06/2005 0.02 45 770 7.5 2.3

13/07/2005 0.1 46 801 7.4 2.7

01/09/2005 0.02 47 786 7.8 3.2 119

14/10/2005 0.05 15 570 8 2.3

20/12/2005 0.02 11 597 8.1 1.8

25/01/2006 0.07 51 832 7.4 2.8

27/02/2006 0.02 51 770 7.5 2.9 121

30/03/2006 0.02 53 793 7.9 3.7

27/04/2006 0.02 56 814 8.6 3.6

03/02/2011 0.028 55 830 7.5 4.1 120

04/05/2011 0.052 65.1 832 8.19 1.67 127

11/08/2011 0.0867 48.9 783 8.09 1.06 107

15/11/2011 0.154 44.9 741 7.56 1.08 113

29/02/2012 0.005 43 830 8.1 1.9

30/08/2012 0.005 44 851 7.9 1.3

31/10/2012 0.005 48 871 7.7 0.39

13/11/2012 0.005 48 885 7.7 0.7

27/02/2013 0.005 52 898 7.9 1.9

30/05/2013 0.005 56 880 7.7 2

14/05/2014 0.005 64 7.3 2.2

29/08/2014 0.02 50 844 7.5 1.1

06/11/2014 0.4 49 835 7.5 0.78

05/02/2015 0.005 47 770 8 0.97

13/05/2015 0.005 47 889 7.2

Date

Am

monia

cal N

itro

gen (

N:m

g/l)

Chlo

ride (

mg/l)

Conductivity (

uS

/ c

m)

pH

(Lab)

Tota

l O

rganic

Carb

on (

mg/l)

Tota

l S

ulp

hur

(SO

4:m

g/l)

GW3

07/08/2015 0.005 43 911 7.3

05/11/2015 0.01 42 857 7.3

05/02/2016 0.02 46 928 6.9

12/05/2016 0.005 47 928 7.2

03/08/2016 0.04 52 932 7.4

08/11/2016 0.02 46 907 7.3

09/02/2017 0.01 41 914 7.2

25/05/2017 0.07 41 874 7.2

04/08/2017 0.01 42 830 7.4

10/11/2017 0.02 40 811 7.5

09/02/2018 0.005 43 837 7.6

03/05/2018 0.005 50 874 8

09/08/2018 0.005 51 796 7.3

14/11/2018 0.01 48 824 7.2

28/02/2019 0.02 50 849 7.6

29/05/2019 0.005 48 840 7.4

29/08/2019 0.06 47 842 7.6

11/11/2019 0.01 45 940 7.2

25/02/2020 0.005 57 878 7.2

Min 0.01 11 570 6.4 0.15 102

Mean 0.19 49.6 823.52 7.57 3.38 137.78

Max 1.4 100 1010 8.7 8.8 177

0

20

40

60

80

100

120

0

200

400

600

800

1000

1200

Concentra

tion m

g/l

Concentr

ation (

us/c

m)

Date





Chloride (mg/l)

pH (Lab)


Date

Am

monia

cal N

itro

gen (

N:m

g/l)

Chlo

ride (

mg/l)

Conductivity (

uS

/ c

m)

pH

(Lab)

Tota

l O

rganic

Carb

on (

mg/l)

Tota

l S

ulp

hur

(SO

4:m

g/l)

07/11/2001 0.15 49 721 7.9 3.7 106

14/11/2001 0.5 49 760 7.8 3.1 102

23/11/2001 0.3 49 806 7.5 1.7 106

29/11/2001 1.2 44 784 7.4 3.6 110

20/12/2001 0.4 49 721 8.5 2.1 106

09/01/2002 0.15 48 769 8.3 2.8 127

05/02/2002 0.15 38 666 7.5 2.6 96

14/03/2002 0.15 39 602 7.8 3.6 92

03/04/2002 0.4 46 689 7.5 2.6 101

27/08/2002 0.3 41 626 8.8 2.2 116

17/09/2002 0.15 13 479 8.4 4.1 64

15/10/2002 0.15 46 795 7.7 3.9 134

13/11/2002 0.5 28 566 8 8 95

12/12/2002 0.15 39 681 8.1 4.8 130

21/01/2003 0.3 30 736 8.4 4.9 98

12/02/2003 0.3 43 739 7.5 2.1 117

12/03/2003 0.02 45 772 7.1 2.6 120

01/04/2003 0.02 53 816 7.9 2.6 148

07/05/2003 0.02 51 734 7.8 2.8 139

25/06/2003 0.02 49 867 7.3 2.4 143

09/07/2003 0.02 47 881 7.6 1.9 139

27/08/2003 0.02 50 837 7.2 3.7 140

17/09/2003 0.02 47 843 8.1 2.4 132

02/10/2003 0.02 46 828 7.4 2.9 128

12/11/2003 0.02 44 740 7.7 2.1 121

04/12/2003 0.02 39 764 8.2 7.5 124

07/01/2004 0.02 36 758 7.4 3.5 135

04/02/2004 0.02 37 849 7.5 3.9 144

24/03/2004 0.05 49 882 7.4 5.3 198

28/05/2004 0.02 44 817 7.4 4.6 156

16/06/2004 0.02 51 908 7.7 3.7 196

29/07/2004 0.4 48 899 7.3 4.7 171

11/08/2004 0.6 43 913 7.5 4.6 172

04/10/2004 1.1 46 934 8.5 3

26/10/2004 0.15 45 792 7.3 3.5

24/11/2004 0.5 45 796 7.2 3.1 131

22/12/2004 0.15 28 767 7.4 4

19/01/2005 0.15 41 754 7.5 2.8

23/02/2005 0.15 55 723 7.6 2.9 128

16/03/2005 0.15 68 889 7.4 3.5

11/05/2005 0.02 46 908 7.7 3.4 174

14/06/2005 0.02 47 900 7.5 3.3

13/07/2005 0.02 49 879 7.3 3.1

01/09/2005 0.02 48 847 7.8 3 152

30/09/2005 0.02 43 855 7.2 6.7

14/10/2005 0.09 43 828 7.9 2.7

GW5

Date

Am

monia

cal N

itro

gen (

N:m

g/l)

Chlo

ride (

mg/l)

Conductivity (

uS

/ c

m)

pH

(Lab)

Tota

l O

rganic

Carb

on (

mg/l)

Tota

l S

ulp

hur

(SO

4:m

g/l)

GW5

20/12/2005 0.02 36 788 7.7 3.3

25/01/2006 0.04 46 817 7.5 3

27/02/2006 0.05 31 550 7.6 3.6 99

30/03/2006 0.02 44 764 7.9 3

27/04/2006 0.02 32 655 8.6 3.3

23/05/2006 0.02 25 596 8.3 3.8 115

04/09/2006 0.02 45 893 7.9 3.3

17/11/2006 0.05 27 640 8.3 3.1 123

19/02/2007 0.06 19 488 7.6 4.9

22/05/2007 0.02 38 606 7.4 3.1 111

10/08/2007 0.05 17 478 7.7 4.1

13/11/2007 0.02 41 764 7.5 4.5 116

29/02/2008 0.19 22 598 7.2 3.8

20/05/2008 0.02 23 565 7 26.6 113

05/08/2008 0.02 35 672 7.8 2.8

10/03/2009 0.24 29 622 7.3 2.55 135

30/11/2009 0.36 21 600 7.7 4.9 140

07/04/2010 0.15 49 690 7.3 3.7 170

08/05/2010 0.027 41 720 7.3 3.4 150

13/08/2010 0.01 47 880 7.3 2.1 160

25/11/2010 0.093 48 700 7.6 4.2 120

03/02/2011 0.022 30 710 7.4 5 140

04/05/2011 0.0967 55.6 816 8.09 2.88 170

11/08/2011 0.0815 43.6 884 7.8 1.9 152

15/11/2011 0.0468 41.1 831 7.54 1.58 136

29/02/2012 0.005 41 910 7.9 2.5

22/05/2012 0.005 39 878 7.9 3.6

30/08/2012 0.005 42 939 7.8 2.6

31/10/2012 0.005 29 821 7.6 4.5

13/11/2012 0.005 28 792 7.7 4.8

27/02/2013 0.005 44 876 7.9 4.3

30/05/2013 0.005 49 770 7.5 3.6

26/09/2013 0.005 47 970 7.3 1.7

14/05/2014 0.005 47 7.4 3.1

29/08/2014 0.02 45 821 7.5 2

06/11/2014 0.05 44 865 8 1.6

05/02/2015 0.005 30 777 7.4 3.3

13/05/2015 0.005 43 906 7.2

07/08/2015 0.08 41 1020 7.1

05/11/2015 0.01 40 956 7.2

05/02/2016 0.01 27 885 7

12/05/2016 0.01 40 877 7.2

03/08/2016 0.03 39 917 7.4

08/11/2016 0.02 43 1030 7.2

09/02/2017 0.005 35 895 7.1

25/05/2017 0.08 37 853 7.1

Date

Am

monia

cal N

itro

gen (

N:m

g/l)

Chlo

ride (

mg/l)

Conductivity (

uS

/ c

m)

pH

(Lab)

Tota

l O

rganic

Carb

on (

mg/l)

Tota

l S

ulp

hur

(SO

4:m

g/l)

GW5

04/08/2017 0.005 51 877 7.3

10/11/2017 0.005 54 954 7.3

09/02/2018 0.005 37 806 7.7

03/05/2018 0.04 12 525 7.9

13/08/2018 0.005 38 695 7.3 2.1

14/11/2018 0.11 30 641 7.1

28/02/2019 0.02 37 837 7.6

29/06/2019 0.02 45 885 7.4

19/08/2019 0.005 47 967 7.4

11/11/2019 0.02 46 950 7.2

25/02/2020 0.02 28 727 7.4

Min 0.01 12 478 7 1.58 64

Mean 0.11 40.54 784.99 7.6 3.69 130.96

Max 1.2 68 1030 8.8 26.6 198

0

20

40

60

80

100

120

0

200

400

600

800

1000

1200

Concentra

tion m

g/l

Concentr

ation (

us/c

m)

Date





Chloride (mg/l)

pH (Lab)


Date

Am

monia

cal N

itro

gen (

N:m

g/l)

Chlo

ride (

mg/l)

Conductivity (

uS

/ c

m)

pH

(Lab)

Tota

l O

rganic

Carb

on (

mg/l)

Tota

l S

ulp

hur

(SO

4:m

g/l)

07/11/2001 0.15 42 545 8.3 3.6 67

14/11/2001 0.4 41 570 7.6 3.2 63

23/11/2001 0.4 44 592 7.6 2.6 73

29/11/2001 1.2 44 646 7.6 3.4 71

20/12/2001 0.15 49 602 8.2 3.2 84

09/01/2002 0.15 49 723 8.3 2.9 104

05/02/2002 0.15 41 672 7.6 3.1 86

14/03/2002 0.5 44 679 7.8 2.4 75

03/04/2002 0.3 46 650 7.5 2.2 89

07/06/2002 0.15 46 711 7.7 2.6 85

02/07/2002 0.5 47 738 7.62 3.6 92

27/08/2002 0.15 43 680 8.8 2.4 92

17/09/2002 0.15 44 702 7.8 3.2 92

15/10/2002 0.15 43 730 7.8 3.6 98

13/11/2002 0.4 44 746 7.9 4 97

12/12/2002 0.15 42 643 7.7 2.9 98

21/01/2003 0.4 49 846 8.2 3.2 108

12/02/2003 0.5 55 791 7.7 1.3 104

12/03/2003 0.02 54 806 7.2 2 104

01/04/2003 0.07 54 900 8.6 2.7 110

07/05/2003 0.05 55 674 7.9 2.9 108

25/06/2003 0.02 54 821 7.5 1.9 112

09/07/2003 0.02 54 832 7.7 4.4 112

27/08/2003 0.02 53 809 7.3 2.9 113

17/09/2003 0.02 56 825 8.4 3.3 108

02/10/2003 0.02 53 800 7.5 1.9 109

12/11/2003 0.02 52 720 7.7 1.7 100

04/12/2003 0.02 52 820 6.9 1.9 109

07/01/2004 0.02 46 774 7.5 2 107

04/02/2004 0.02 47 856 7.6 3.4 115

24/03/2004 0.04 48 783 7.6 3.3 126

28/05/2004 0.02 51 807 7.4 4 132

16/06/2004 0.02 51 816 7.8 2.9 139

29/07/2004 0.4 50 846 7.4 3.6 135

11/08/2004 0.6 46 858 7.6 3.1 139

04/10/2004 0.3 51 930 8.5 2.9

26/10/2004 0.15 51 839 7.4 2.5

24/11/2004 0.4 48 831 7.3 2.7 144

22/12/2004 0.15 48 979 7.4 2.5

19/01/2005 0.3 49 773 7.4 2.8

23/02/2005 0.15 54 767 7.6 3 140

16/03/2005 0.15 47 843 7.5 3.2

13/04/2005 0.15 2

11/05/2005 0.02 45 844 8.1 3.4 145

14/06/2005 0.04 50 840 7.6 3.2

13/07/2005 0.02 52 853 7.4 2.5

GW6

Date

Am

monia

cal N

itro

gen (

N:m

g/l)

Chlo

ride (

mg/l)

Conductivity (

uS

/ c

m)

pH

(Lab)

Tota

l O

rganic

Carb

on (

mg/l)

Tota

l S

ulp

hur

(SO

4:m

g/l)

GW6

01/09/2005 0.02 54 827 7.8 3.1 137

30/09/2005 0.02 51 856 7.2 3.3

14/10/2005 0.02 50 823 7.8 2.5

20/12/2005 0.05 43 822 7.7 3

25/01/2006 0.12 47 825 7.5 2.5

27/02/2006 0.04 42 726 7.7 2.6 135

30/03/2006 0.02 44 744 8 3.5

23/05/2006 0.04 44 774 8.4 2.3 134

04/09/2006 0.05 50 840 8 2.4

17/11/2006 0.07 45 762 8.2 3.1 128

19/02/2007 0.09 33 650 7.8 3.1

22/05/2007 0.02 40 710 7.5 2 115

10/08/2007 0.02 44 763 7.6 3.1

13/11/2007 0.09 46 746 7.6 3.8 122

29/02/2008 0.08 37 709 7.4 2.4

20/05/2008 0.02 33 671 7.2 2.5 117

05/08/2008 0.02 39 711 7.8 3.1

30/11/2009 0.0075 50 690 8 1.3 150

07/04/2010 0.15 46 810 7.3 2 150

08/05/2010 0.01 39 820 7.3 1.8 130

13/08/2010 0.01 48 860 7.6 1.3 130

25/11/2010 0.14 56 810 7.4 1.2 150

03/02/2011 0.01 40 830 7.5 1.8 140

04/05/2011 0.0375 44.7 825 8 1.86 140

11/08/2011 0.202 45.4 841 7.7 4.09 138

15/11/2011 0.123 47.1 831 7.39 1.83 132

29/02/2012 0.01 48 919 7.9 2.6

22/05/2012 0.005 45 891 7.7 2.2

30/08/2012 0.005 46 927 7.8 2.4

31/10/2012 0.005 44 932 7.6 1.3

13/11/2012 0.005 43 929 7.7 1.6

27/02/2013 0.005 42 906 7.7 3.3

30/05/2013 0.005 46 884 7.5 2.1

26/09/2013 0.005 51 970 7.3 1.2

25/11/2013 0.02 45 923 7.4 1.5

14/02/2014 0.01 50 947 7.8 1.3

14/05/2014 0.03 55 7.3 1.2

29/08/2014 0.06 56 726 7.6 0.96

06/11/2014 0.06 56 931 7.7 1.1

05/02/2015 0.005 48 897 7.3 1.3

13/05/2015 0.005 47 969 7.4

07/08/2015 0.005 48 1000 7.2

05/11/2015 0.005 49 964 7.2

05/02/2016 0.01 46 827 7.1

12/05/2016 0.01 45 981 7.2

03/08/2016 0.02 46 965 7.3

Date

Am

monia

cal N

itro

gen (

N:m

g/l)

Chlo

ride (

mg/l)

Conductivity (

uS

/ c

m)

pH

(Lab)

Tota

l O

rganic

Carb

on (

mg/l)

Tota

l S

ulp

hur

(SO

4:m

g/l)

GW6

08/11/2016 0.02 48 980 7.3

09/02/2017 0.005 46 1000 7.3

25/05/2017 0.09 47 968 7.2

04/08/2017 0.005 50 928 7.4

10/11/2017 0.03 50 928 7.4

09/02/2018 0.005 49 914 7.6

03/05/2018 0.04 41 904 8

09/08/2018 0.02 50 863 7.2

14/11/2018 0.02 51 916 7.2

28/02/2019 0.03 48 920 7.6

29/06/2019 0.005 47 884 7.5

19/08/2019 0.09 48 946 7.5

11/11/2019 0.02 49 941 7.4

25/02/2020 0.01 43 915 7.2

Min 0.005 33 545 6.9 0.96 63

Mean 0.11 47.29 820.03 7.62 2.58 113.57

Max 1.2 56 1000 8.8 4.4 150

0

20

40

60

80

100

120

0

200

400

600

800

1000

1200

1400

Concentra

tion m

g/l

Concentr

ation (

us/c

m)

Date





Chloride (mg/l)

pH (Lab)


Date

Am

monia

cal N

itro

gen (

N:m

g/l)

Chlo

ride (

mg/l)

Conductivity (

uS

/ c

m)

pH

(Lab)

Tota

l O

rganic

Carb

on (

mg/l)

Tota

l S

ulp

hur

(SO

4:m

g/l)

30/10/2001 0.15 44 879 7.6 3.4 105

07/11/2001 0.15 33 785 8.2 3.4 126

14/11/2001 0.15 34 853 7.1 3.1 123

23/11/2001 0.3 34 823 7.5 1.3 125

29/11/2001 1.1 30 807 7.3 4 125

20/12/2001 0.9 36 537 7 2.2 124

09/01/2002 0.4 38 800 8.2 3.1 142

05/02/2002 0.7 36 900 7.6 3.7 121

14/03/2002 0.15 35 809 7.5 2.6 107

03/04/2002 0.15 33 762 7.3 2.5 108

27/08/2002 0.15 27 1220 8 2.4 114

17/09/2002 0.15 28 615 7.7 3.7 113

15/10/2002 0.15 30 756 7.7 3 117

13/11/2002 0.4 30 784 7.7 4 119

12/12/2002 0.15 33 693 7.8 3.7 117

21/01/2003 0.15 31 861 8.1 3 119

12/02/2003 2.9 32 827 7.4 1 114

12/03/2003 0.02 29 838 7 2.4 108

01/04/2003 0.08 28 857 8.4 1.9 110

07/05/2003 0.15 26 652 7.7 1.7 120

25/06/2003 0.02 27 779 7.2 1.6 109

09/07/2003 0.06 27 807 7.5 2.9 111

27/08/2003 0.02 28 781 7.2 2.6 118

17/09/2003 0.02 30 792 8.3 4.8 117

02/10/2003 0.02 29 783 7.4 3.1 115

12/11/2003 0.02 27 740 7.9 2.3 141

04/12/2003 0.02 27 810 6.9 2.3 117

07/01/2004 0.02 31 800 7.4 1.9 118

04/02/2004 0.02 31 896 7.4 3 122

24/03/2004 0.07 28 774 7.3 2.6 112

28/05/2004 0.02 30 774 7.3 2.9 108

16/06/2004 0.02 26 763 7.5 2.9 109

29/07/2004 0.3 26 793 7.2 3.7 104

11/08/2004 0.6 25 829 7.4 2.7 113

04/10/2004 0.4 28 656 7.8 3.5

26/10/2004 0.15 27 794 7.1 1.6

24/11/2004 0.4 27 795 7.2 2.6 114

22/12/2004 0.15 28 842 7.6 2.4

19/01/2005 0.15 30 755 7.1 1.7

23/02/2005 0.15 32 737 7.7 2.6 121

16/03/2005 0.15 28 810 7.3 2.5

13/04/2005 0.15 2

11/05/2005 0.02 25 811 7.7 2.2 122

13/07/2005 0.05 28 807 7.3 2.7

01/09/2005 0.02 30 784 7.6 3.1 119

30/09/2005 0.02 28 803 7.1 2.4

GW8

Date

Am

monia

cal N

itro

gen (

N:m

g/l)

Chlo

ride (

mg/l)

Conductivity (

uS

/ c

m)

pH

(Lab)

Tota

l O

rganic

Carb

on (

mg/l)

Tota

l S

ulp

hur

(SO

4:m

g/l)

GW8

14/10/2005 0.46 27 780 7.4 2.5

16/11/2005 0.2 30 776 7.2 2.7 136

20/12/2005 0.09 29 844 7.7 3.1

25/01/2006 0.09 49 898 7.3 3

27/02/2006 0.02 43 800 7.5 3.7 134

30/03/2006 0.02 39 804 7.8 2.8

27/04/2006 0.02 36 835 8.7 3.6

23/05/2006 0.07 35 830 8.5 2.2 122

04/09/2006 0.02 30 855 7.9 2.7

17/11/2006 0.02 32 790 8.1 2.1 116

19/02/2007 0.09 32 787 7.5 2.6

22/05/2007 0.02 26 783 7.3 2.1 106

10/08/2007 0.05 27 782 7.3 3.1

13/11/2007 0.04 28 765 7.4 3.5 117

29/02/2008 0.04 29 772 7.2 1.7

20/05/2008 0.02 27 754 7 10.6 111

05/08/2008 0.29 25 712 7.5 3

10/03/2009 0.08 35 765 7.3 3.25 116

07/04/2010 0.15 22 740 7.2 1.3 120

08/05/2010 0.025 18 770 7.2 1.6 110

13/08/2010 0.01 23 770 7.7 1.2 110

25/11/2010 0.13 31 780 7.6 0.9 130

03/02/2011 0.01 31 800 7.4 1 120

04/05/2011 0.0606 25.7 739 8.23 1.29 107

11/08/2011 0.182 24.9 755 7.82 1.09 107

15/11/2011 0.138 28.6 749 7.51 1.01 111

29/02/2012 0.02 34 727 7.8 2.3

22/05/2012 0.12 38 863 7.7 2.3

30/08/2012 0.005 40 885 7.6 2.2

31/10/2012 0.005 38 893 7.5 0.49

13/11/2012 0.01 38 901 7.6 1

27/02/2013 0.005 28 835 7.9 1.9

30/05/2013 0.005 24 775 7.5 2.2

26/09/2013 0.005 27 842 7.3 1

25/11/2013 0.02 27 833 7.2 0.83

14/02/2014 0.03 32 828 8 0.64

14/05/2014 0.005 26 7.3 0.75

29/08/2014 0.07 28 658 7.5 0.8

06/11/2014 0.04 29 820 7.3 0.68

05/02/2015 0.005 34 794 7.8 0.91

13/05/2015 0.005 27 844 7.3

07/08/2015 0.04 26 880 7.1

05/11/2015 0.01 30 855 7.2

05/02/2016 0.01 35 941 7

12/05/2016 0.02 30 853 7.3

03/08/2016 0.03 30 885 7.2

Date

Am

monia

cal N

itro

gen (

N:m

g/l)

Chlo

ride (

mg/l)

Conductivity (

uS

/ c

m)

pH

(Lab)

Tota

l O

rganic

Carb

on (

mg/l)

Tota

l S

ulp

hur

(SO

4:m

g/l)

GW8

08/11/2016 0.02 28 904 7.2

09/02/2017 0.005 31 921 7.1

25/05/2017 0.1 56 940 7.1

04/08/2017 0.02 61 883 7.2

10/11/2017 0.005 48 865 7.4

09/02/2018 0.005 58 859 7.4

03/05/2018 0.03 58 903 7.8

09/08/2018 0.04 33 780 7.2

14/11/2018 0.02 32 816 7.1

28/02/2019 0.03 36 858 7.4

12/06/2019 0.005 31 843 7.2

19/08/2019 1 32 858 7.4

11/11/2019 0.04 32 854 7.1

25/02/2020 0.03 36 863 7.1

Min 0.005 18 537 6.9 0.49 104

Mean 0.15 31.68 810.26 7.49 2.45 117.04

Max 2.9 61 1220 8.7 10.6 142

Documents

Groundwater Report - kentenviropower.fccenvironment.co.uk · Groundwater Report May 2020 4557/R/010/02 Allington Landfill Groundwater Report Closure Report Appendix May 2020 Carried