Water Sampling Results

Water Quality Monitoring of the River Cherwell: Sampling Results

    Overview

    We have been carrying out water quality sampling of the River Cherwell to check for potential impacts of run-off or leaching from the waste. This is additional to the routine sampling the Environment Agency carries out on the River Cherwell. 

    Until February 2026, the Environment Agency aimed to carry out weekly water quality monitoring subject to weather conditions and in response to any emerging evidence. Due to the high rainfall in January and February 2026, conditions on site meant that it was not possible to gain weekly water samples. This is because the locations where we need to take representative water samples were not accessible. We know that when water levels are high, we are not likely to gain meaningful data in relation to Kidlington due the high level of dilution.

    From March 2026, our contractor Acumen Waste Services Limited became responsible for ongoing water quality sampling near to the illegal waste site. They we will continue to monitor for signs of pollution from the waste and we will update the information on this site as and when it becomes available. 

    The analysis is reviewed by specialists in toxicology. We know that there are many potential sources of substances found in water courses, including run off from roads, agriculture, the water industry, other industries and naturally occurring substances. We know that like many of our rivers the River Cherwell has its challenges with the water body classified as having a Moderate ecological status. Information is available here: Catchment Data Explorer: Cherwell (Bletchingdon to Ray) Water Body

    Water quality samples includes an assessment using the gas chromatography-mass spectrometry (GCMS) screening technique: Water quality monitoring data GC-MS and LC-MS semi-quantitative screen.

    We will continue to monitor and we will make sample results available as and when the analysis is complete. https://environment.data.gov.uk/catchment-planning/WaterBody/GB106039037432

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    Analytical results from samples taken from 18 March 2026 onwards

    Our contractors are carrying out water sampling of the Cherwell every two weeks, subject to weather and ground conditions. This will continue until all the waste has been removed. 

    All assessments of samples taken show that similar chemicals present in the upstream and downstream samples and includes chemicals that are found in other English waterways. These are in very low levels and any impacts on the environment are negligible. If this assessment changes we will update this page.

    Please note that there has been a change in the sampling and analysis and the analytical methods have changed as a result.  This is because the responsibility for the work has moved to the site operators, Acumen Waste Services Limited.  

    If you would like a pdf copy of the full chemical analysis for any of the samples, please email us: kidlington@environment-agency.gov.uk   

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    Analytical results from samples taken 5 and 11 March 2026

    Our assessment of samples taken on 5 March and 11 March 2026 shows that similar chemicals present in the upstream and downstream samples and includes chemicals that are found in other English waterways. These are in very low levels and any impacts on the environment are negligible. 

    Please note that there has been a change in the sampling and analysis and the analytical methods have changed as a result.  This is because the responsibility for the work has moved to the site operators, Acumen Waste Services Limited.  

    If you would like a pdf copy of the full chemical analysis, please email us: kidlington@environment-agency.gov.uk   

    The sampling locations used are:  

     

    EA Sample Point (SP) Ref. 

    Acumen SP Ref. 5/3/26 

    Acumen SP Ref. 11/3/26 

    Location (NGR) 

    U/S Tributary 1 (Sample 1) 

    SP1 

    SP1 

    SP 50747 14126 

    U/S Tributary 2 (Sample 2) 

    SP2 

    SP2 

    SP 50764 13829 

    Ingress (Sample 3) 

    SP3 

    SP3 

    SP 50791 13850 

    Waste (Sample 4) 

    SP5  

    N/A – All wastewater on site now covered by aggregate 

    SP 50781 14096 

    D/S Cherwell 1 (Sample 5) 

    SP5 

    SP5 

    SP 50916 13798 

     

    D/S Cherwell 2 (Sample 6) 

    SP6 

    SP6 

    SP 50943 13253 

     

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    Analytical results from samples taken 14 January 2026

    Our assessment of samples taken on 14 January 2026 shows no significant increase in the range of chemicals in the ingress and downstream samples or in the concentrations downstream compared to upstream. They include chemicals that are found in other English waterways. 

    This data includes that obtained by using the GC-MS analytical technique: further guidance on this is available here: Water quality monitoring data GC-MS and LC-MS semi-quantitative screen

    Disclaimer for GCMS Results: All results are an approximate concentration. Where accreditation is claimed this is only for the identification of the substance and not the quantified amount. 

    The compounds identified in the GCMS results fit into one of four criteria, which can be pulled from the original dataset on MIDAS if required:

      1. "The following compounds were identified using the NLS Screening database in combination with the National Institute of Standards and Technology Library (NIST) and have a Spectral Fit of >80%"
      2. "The following compounds were identified using the NLS Screening database in combination with the National Institute of Standards and Technology Library (NIST) and have a Spectral Fit of <80%"
      3. "The following compounds were identified using the National Institute of Standards and Technology Library (NIST) and have a Spectral Fit of >80%"
      4. "The following compounds were identified using the National Institute of Standards and Technology Library (NIST) and have a Spectral Fit of <80%"

     

    Samples were taken from the following locations:

    Sample

    Location (NGR)

    U/S Tributary 1 (Sample 1)

    SP 50747 14126

    U/S Tributary 2 (Sample 2)

    SP 50764 13829

    Ingress (Sample 3)

    SP 50791 13850

    D/S River Cherwell 1 (Sample 3)

    SP 50916 13798

     

     

     

     

     

     

     

    U/S = Upstream of the waste

    D/S = Downstream of the waste

    Waste = Sample taken from run-off/standing groundwater that has collated around the waste site boundary

    NGR = National Grid Reference

    Due to site flooding, samplers were unable to access the waste and D/S 2 sampling locations as they had done in previous weeks.

    Determinand / Compound Name

    U/S 1 (Sample 1)

    U/S 2 (Sample 2)

    Ingress (Sample 3)

    D/S 1 (Sample 5) 

    Unit

    Ammonia un-ionised as N

    <0.00018

    <0.00034

    <0.00029

    <0.00036

    mg/l

    Ammoniacal Nitrogen as N

    <0.03

    <0.03

    <0.03

    <0.03

    mg/l

    BOD : 5 Day ATU

    <3

    <3

    <3

    <3

    mg/l

    Chemical Oxygen Demand :- {COD}

    11

    10

    11

    11

    mg/l

    Chloride

    39

    34

    38

    35

    mg/l

    Conductivity at 25 C

    586

    562

    378

    565

    uS/cm

    Nitrite as N

    0.014

    0.014

    0.013

    0.014

    mg/l

    Nitrogen, Total Oxidised as N

    6.6

    7.1

    6.5

    7.1

    mg/l

    Orthophosphate, reactive as P

    0.14

    0.088

    0.071

    0.093

    mg/l

    Oxygen, Dissolved, % Saturation

    86.2

    95.5

    94.4

    96.7

    %

    pH

    7.67

    7.94

    7.9

    7.97

    PHUNITS

    Salinity : In Situ

    0.28

    0.27

    0.28

    0.37

    ppt

    Solids, Suspended at 105 C

    <6

    11

    <6

    12

    mg/l

    Temperature of Water

    5

    5.2

    4.5

    5.3

    CEL

    Aluminium

    0.28

    0.35

    0.21

    0.82

    mg/l

    Barium

    0.015

    0.014

    0.012

    0.012

    mg/l

    Calcium

    84

    82

    84

    83

    mg/l

    Copper

     

     

     

    0.01

    mg/l

    Iron

    0.41

    0.62

    0.33

    0.64

    mg/l

    Magnesium

    4.9

    4.8

    4.8

    5

    mg/l

    Manganese

     

    0.011

     

    0.016

    mg/l

    Potassium

    4.1

    3.6

    3.8

    3.6

    mg/l

    Sodium

    22

    20

    22

    20

    mg/l

    Strontium

    0.23

    0.21

    0.22

    0.21

    mg/l

    Zinc

    0.005

    0.006

    0.005

    0.012

    mg/l

    1,1-Dimethyl-3-chloropropanol

     

    0.016

     

     

    ug/l

    1,3-Benzenediol, monobenzoate

     

    0.013

     

     

    ug/l

    13-Docosenamide, (Z)-

     

     

    1

     

    ug/l

    1-Butanol, 2,3-dimethyl-

    0.087

    0.316

     

    0.085

    ug/l

    1-Pentene, 4,4-dimethyl-

    0.016

     

     

     

    ug/l

    2-(4'-Methoxyphenyl)-2-(3'-methyl-4'methoxyphenyl)propane

     

     

    0.071

     

    ug/l

    2,2,4-Trimethyl-1,3-pentanediol diisobutyrate

     

     

    0.049

     

    ug/l

    2,4,6-Trimethyl-1-nonene

     

     

    0.081

     

    ug/l

    2,4,7,9-Tetramethyl-5-decyne-4,7-diol

    0.295

    0.402

    0.346

    0.401

    ug/l

    2-Butanol, 2,3-dimethyl-

     

    0.188

     

     

    ug/l

    2-Ethylhexanoic acid

     

    0.172

     

     

    ug/l

    3-Buten-2-one, 3-methyl-

     

     

     

    0.063

    ug/l

    3-Hexanone, 2,5-dimethyl-

    0.014

     

     

     

    ug/l

    3-Pentanone

    0.018

    0.02

    0.027

     

    ug/l

    3-Penten-2-one

    0.045

     

     

     

    ug/l

    4-Cyanocyclohexene

     

    0.036

     

     

    ug/l

    4H-1,2,4-Triazol-4-amine

     

     

    0.045

     

    ug/l

    Butyl aldoxime, 3-methyl-, syn-

     

    0.062

     

     

    ug/l

    Caffeine

    0.057

    0.053

    0.061

    0.071

    ug/l

    Caprolactam

     

    0.779

     

    0.336

    ug/l

    Decane, 2,2,8-trimethyl-

    0.013

     

     

     

    ug/l

    Dimethyl phthalate

     

     

     

    0.07

    ug/l

    Diphenyl sulfone

     

    0.007

     

     

    ug/l

    Ethanone, 1,1'-(1,4-phenylene)bis-

     

    0.62

    0.572

     

    ug/l

    Ethanone, 1-[4-(1-hydroxy-1-methylethyl)phenyl]-

     

    0.097

    0.169

     

    ug/l

    Ethanone, 2,2-dimethoxy-1,2-diphenyl-

     

     

    0.069

    0.054

    ug/l

    Fluoranthene

     

    0.003

     

     

    ug/l

    Hexamethoxymethylmelamine

    0.827

    0.655

     

    0.929

    ug/l

    Hexane, 3,3-dimethyl-

    0.015

     

     

     

    ug/l

    meso-3,4-Hexanediol

     

    0.062

     

     

    ug/l

    N,N-Diethyl-m-toluamide

     

    0.011

    0.101

     

    ug/l

    n-Hexadecanoic acid

    0.091

     

    0.404

    0.269

    ug/l

    Octadecanoic acid

    0.03

    0.094

    0.17

    0.096

    ug/l

    Octan-2-yl palmitate

     

     

    0.06

     

    ug/l

    Propyzamide

    0.032

    0.04

    0.046

    0.036

    ug/l

    Sulfurous acid, 2-ethylhexyl hexyl ester

     

    0.024

    0.026

     

    ug/l

    Supraene

     

    0.085

     

     

    ug/l

    Tri-(2-chloroethyl) phosphate

     

    0.076

    0.078

    0.124

    ug/l

    Tri-allate

     

     

     

    0.012

    ug/l

    Triethyl Citrate

     

    0.403

     

     

    ug/l

    Trifluoroacetic acid, 2-tetrahydrofurylmethyl ester

     

     

     

    0.045

    ug/l

    Undecane, 4,6-dimethyl-

    0.034

     

     

     

    ug/l

     

    Use limitation statement

    There are no public access constraints to this data. Use of this data is subject to the licence identified.

    Licence

    Open Government Licence(External link)

    Attribution statement

    © Environment Agency copyright and/or database right 2025. All rights reserved.

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    Analytical results from samples taken 5 January 2026

    Our assessment of samples taken on 5 January 2026 has identified some chemicals present in the River Cherwell at negligible levels downstream of the waste that are not found upstream. We cannot be certain if they are from the waste pile or another source and they include chemicals that are found in other English waterways. Any impacts on the environment are negligible.   

    This data includes that obtained by using the GC-MS analytical technique: further guidance on this is available here: Water quality monitoring data GC-MS and LC-MS semi-quantitative screen

    Disclaimer for GCMS Results: All results are an approximate concentration. Where accreditation is claimed this is only for the identification of the substance and not the quantified amount.

    The compounds identified in the GCMS results fit into one of four criteria, which can be pulled from the original dataset if required:

      1. "The following compounds were identified using the NLS Screening database in combination with the National Institute of Standards and Technology Library (NIST) and have a Spectral Fit of >80%"
      2. "The following compounds were identified using the NLS Screening database in combination with the National Institute of Standards and Technology Library (NIST) and have a Spectral Fit of <80%"
      3. "The following compounds were identified using the National Institute of Standards and Technology Library (NIST) and have a Spectral Fit of >80%"
      4. "The following compounds were identified using the National Institute of Standards and Technology Library (NIST) and have a Spectral Fit of <80%" 

     

    Samples were taken from the following locations:

    Sample

    Location (NGR)

    U/S Tributary 1 (Sample 1)

    SP 50747 14126

    U/S Tributary 2 (Sample 2)

    SP 50764 13829

    D/S River Cherwell 1 (Sample 3)

    SP 50916 13798

    D/S River Cherwell 2 (Sample 4)

    SP 50943 13253

     




    U/S = Upstream of the waste

    D/S = Downstream of the waste

    Waste = Sample taken from run-off/standing groundwater that has collated around the waste site boundary

    NGR = National Grid Reference

     

    Determinand / Compound Name

    U/S 1 

    U/S 2 

    D/S 1 

    D/S 2

    Unit

    pH

    7.41

    8.13

    8.11

    8.16

    PHUNITS

    Temperature of Water

    2.4

    2.5

    2.9

    2.6

    CEL

    Conductivity at 25 C

    731

    681

    693

    683

    uS/cm

    BOD : 5 Day ATU

    <3

    <3

    <3

    <3

    mg/l

    Chemical Oxygen Demand :- {COD}

    15

    <10

    <10

    <10

    mg/l

    Ammoniacal Nitrogen as N

    <0.03

    <0.03

    <0.03

    <0.03

    mg/l

    Nitrogen, Total Oxidised as N

    1.7

    7.8

    7.8

    7.8

    mg/l

    Nitrite as N

    0.012

    0.012

    0.012

    0.011

    mg/l

    Ammonia un-ionised as N

    <0.00008

    <0.00032

    <0.00032

    <0.00032

    mg/l

    Solids, Suspended at 105 C

    <6

    6.5

    6.7

    6.5

    mg/l

    Chloride

    51

    38

    38

    38

    mg/l

    Orthophosphate, reactive as P

    0.063

    0.081

    0.082

    0.083

    mg/l

    Visible oil or grease, significant trace: Present/Not found (1/0)

     

    Not found

    Not found

    Not found

    N/A

    Salinity : In Situ

     

    0.33

    0.34

    0.33

    ppt

    Oxygen, Dissolved, % Saturation

    39.2

    95.9

    94.1

    96.9

    %

    Sodium

    29

    24

    23

    23

    mg/l

    Magnesium

    5.3

    5.8

    5.7

    5.8

    mg/l

    Aluminium

    0.055

    0.16

    0.28

    0.19

    mg/l

    Potassium

    4.2

    4.3

    4.4

    4.2

    mg/l

    Calcium

    110

    110

    100

    110

    mg/l

    Manganese

    0.059

    0.013

    0.016

    0.017

    mg/l

    Iron

    0.10

    0.26

    0.32

    0.34

    mg/l

    Copper

     

     

    0.0095

     

    mg/l

    Zinc

     

     

    0.0088

     

    mg/l

    Strontium

    0.36

    0.25

    0.25

    0.25

    mg/l

    Barium

    0.019

    0.011

    0.012

    0.012

    mg/l

    (E)-9-Octadecenoic acid ethyl ester

     

     

     

    3.2

    ug/l

    .beta.-Guanidinopropionic acid

     

    0.013

     

     

    ug/l

    1,1-Dimethyl-3-chloropropanol

     

    0.014

     

     

    ug/l

    1,2-Benzenediol, o-(3-bromobenzoyl)-o'-(2,3,4-trifluorobenzoyl)-

     

     

    0.039

     

    ug/l

    1,3-Dimethyl-5-pylazolyl-2,4-dichlorobenzoate

    0.031

    0.033

    0.02

     

    ug/l

    1H-Pyrazole, 4,5-dihydro-5-methyl-

     

     

     

    0.064

    ug/l

    1-Hydroxy-3-methoxy-6-methylanthraquinone, TMS derivative

     

     

    0.061

     

    ug/l

    1-Propene-1,2,3-tricarboxylic acid, tributyl ester

    0.012

     

    0.016

     

    ug/l

    2,2,4-Trimethyl-1,3-pentanediol diisobutyrate

    0.02

     

    0.023

    0.058

    ug/l

    2,4,7,9-Tetramethyl-5-decyne-4,7-diol

    0.285

    0.225

    0.277

    0.206

    ug/l

    2,5,8-Triphenyl benzotristriazole

     

     

     

    0.015

    ug/l

    2-{2-[2-(Acryloyloxy)-1-methylethoxy]-1-methylethoxy}-1-methylethyl acrylate

     

     

     

    0.074

    ug/l

    2-Ethylhexanal ethylene glycol acetal

     

    0.028

     

     

    ug/l

    2-Pentene, 4,4'-oxybis-

    0.215

    0.266

     

     

    ug/l

    2-Propenoic acid, (1-methyl-1,2-ethanediyl)bis[oxy(methyl-2,1-ethanediyl)] ester

     

     

     

    0.014

    ug/l

    2-Propenoic acid, 2-methyl-, 1-methylbutyl ester

    0.259

    0.307

    0.131

    0.158

    ug/l

    2-Pyrrolidinone, 1-butyl-

     

     

     

    0.065

    ug/l

    3,4-Dihydroxymandelic acid, 4TMS derivative

     

    0.016

     

     

    ug/l

    3,4-Hexanedione, 2,2,5-trimethyl-

     

    0.016

     

     

    ug/l

    3-Acetyl-2,5-dimethyl furan

    0.015

     

     

     

    ug/l

    3-Hexanol, 4-methyl-

     

    0.13

     

     

    ug/l

    3-Hexanone

     

    0.012

     

     

    ug/l

    3-Hexanone, 2,5-dimethyl-

     

    0.021

    0.016

     

    ug/l

    3-Penten-2-one

    0.11

    0.123

    0.05

     

    ug/l

    3-Penten-2-one, (E)-

     

     

     

    0.107

    ug/l

    4-(7-Methyloctyl)phenol

     

     

    0.011

     

    ug/l

    4-fluorophenyl 4-(4-pentylcyclohexyl)benzoate

     

     

    0.017

     

    ug/l

    4-Hydroxy-2-methylacetophenone

     

     

     

    0.018

    ug/l

    9,12-Octadecadienoic acid (Z,Z)-

     

     

     

    4

    ug/l

    9-Octadecenoic acid

     

     

     

    28

    ug/l

    Acetic acid, 3-acetoxy-1-ethyl-2-nitropentyl ester

    0.04

     

     

     

    ug/l

    Benzene, (trimethoxymethyl)-

     

     

     

    0.025

    ug/l

    Benzophenone

     

     

     

    0.11

    ug/l

    Bicyclo[4.1.0]heptane, 7-methylene-

     

     

     

    1.1

    ug/l

    Bisphenol A

    0.07

     

    0.065

     

    ug/l

    Butane, 2-chloro-2-methyl-

     

     

     

    0.089

    ug/l

    Butanoic acid, 2,3-dimethyl-, methyl ester

     

     

     

    0.026

    ug/l

    Butanoic acid, 2-methyl-

     

     

     

    0.024

    ug/l

    Butanoic acid, 3-methyl-

     

     

     

    0.047

    ug/l

    Caffeine

    0.019

    0.07

    0.076

    0.467

    ug/l

    Caprolactam

    0.195

     

     

     

    ug/l

    Carbamazepine

     

    0.039

    0.056

    0.031

    ug/l

    cis-9-Octadecenoic acid, propyl ester

     

     

     

    1.6

    ug/l

    Crotamiton

     

    0.024

    0.031

     

    ug/l

    Cyclopenta[g]-2-benzopyran, 1,3,4,6,7,8-hexahydro-4,6,6,7,8,8-hexamethyl-

     

    0.015

    0.018

    0.015

    ug/l

    Decane, 2,4-dimethyl-

     

     

    0.017

    0.017

    ug/l

    Diphenyl ether

     

     

     

    0.005

    ug/l

    Diphenyl sulfone

    0.03

    0.013

    0.015

     

    ug/l

    Dodecanoic acid

     

     

     

    0.146

    ug/l

    Ethanone, 1-(2-hydroxy-5-methylphenyl)-

     

    0.012

     

     

    ug/l

    Ethanone, 2,2-dimethoxy-1,2-diphenyl-

    0.069

    0.058

    0.151

     

    ug/l

    Fluoranthene

     

    0.003

     

     

    ug/l

    Formamide, N,N-dibutyl-

     

     

     

    0.034

    ug/l

    Hexadecanoic acid, ethyl ester

     

     

     

    0.334

    ug/l

    Hexadecanoic acid, methyl ester

     

    0.062

    0.073

     

    ug/l

    Hexadecanoic acid, propyl ester

     

     

     

    0.105

    ug/l

    Hexanoic acid

     

     

     

    0.242

    ug/l

    Hexyl salicyclate

     

     

     

    0.034

    ug/l

    Isomaltol

    0.012

     

     

     

    ug/l

    Linoleic acid ethyl ester

     

     

     

    1.1

    ug/l

    Metacetamol

    0.04

     

     

     

    ug/l

    Methylal

     

     

     

    0.05

    ug/l

    N,N,N',N'-Tetraacetylethylenediamine

     

    0.108

    0.124

    0.073

    ug/l

    N,N-Diethyl-m-toluamide

     

    0.018

    0.027

    0.022

    ug/l

    N-Cyclohexyl-N'-methylurea, N'-methyl

     

    0.019

     

     

    ug/l

    n-Hexadecanoic acid

    0.108

    0.188

     

    17

    ug/l

    Nonanal

     

     

     

    0.083

    ug/l

    n-Propyl 9,12-octadecadienoate

     

     

     

    0.312

    ug/l

    n-Propyl acetate

     

     

     

    0.033

    ug/l

    Octadecanoic acid

     

    0.062

    0.224

    3

    ug/l

    Octadecanoic acid, ethyl ester

     

     

     

    0.103

    ug/l

    Octan-2-yl palmitate

     

    0.021

    0.022

    0.053

    ug/l

    p-Cresol (4-methylphenol)

     

     

     

    0.225

    ug/l

    Pentanoic acid

     

     

     

    0.441

    ug/l

    Pentanoic acid, 5-hydroxy-, 2,4-di-t-butylphenyl esters

    0.079

    0.063

    0.099

     

    ug/l

    Phenol, 2,4-bis(1,1-dimethylethyl)-, phosphite (3:1)

     

     

    0.243

     

    ug/l

    Phenol, 2,4-di-t-butyl-6-nitro-

     

    0.024

    0.012

     

    ug/l

    Phosphoric acid, 2-chloroethenyl dimethyl ester

     

    0.024

     

    0.026

    ug/l

    Propyzamide

    0.012

    0.019

    0.019

     

    ug/l

    Pyridine, 2,3,6-trimethyl-

     

    0.016

     

     

    ug/l

    Sulfurous acid, 2-ethylhexyl hexyl ester

     

     

    0.022

     

    ug/l

    Tetradecane

     

     

     

    0.023

    ug/l

    Tetradecanoic acid

     

     

     

    0.811

    ug/l

    Tri-(2-chloroethyl) phosphate

     

     

    0.045

     

    ug/l

    Tributyl phosphate

     

     

     

    0.027

    ug/l

    Triethyl Citrate

     

    0.831

    1.2

    1

    ug/l

     

    Use limitation statement

    There are no public access constraints to this data. Use of this data is subject to the licence identified.

    Licence

    Open Government Licence(External link)

    Attribution statement

    © Environment Agency copyright and/or database right 2025. All rights reserved.

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    Analytical results from samples taken 16 December 2025

    Our analysis has been reviewed by specialists in toxicology. Our latest assessment of samples taken on 16 December 2025 suggests there may be minimal seepage into the River Cherwell, however any impacts on the environment are negligible. The chemicals that we’ve found downstream of the site are similar to those already found in the watercourse. 

    Water quality samples include an assessment using the gas chromatography-mass spectrometry (GCMS) screening technique: Water quality monitoring data GC-MS and LC-MS semi-quantitative screen

    We will continue to monitor and we will make sample results available as and when the analysis is complete.  

    Samples were taken from the following locations: 

     

    Sample 

    Location (NGR) 

    U/S Tributary 1 (Sample 1) 

    SP 50747 14126 

    U/S Tributary 2 (Sample 2) 

    SP 50764 13829 

    Ingress (Sample 3) 

    SP 50791 13850 

    Waste (Sample 4) 

    SP 50781 14094 

    D/S River Cherwell 1 (Sample 3) 

    SP 50916 13798 

    D/S River Cherwell 2 (Sample 4) 

    SP 50943 13253 

    U/S = Upstream of the waste 

    D/S = Downstream of the waste 

    Waste = Sample taken from run-off/standing groundwater that has collated around the waste site boundary 

    NGR = National Grid Reference 

    Biological Oxygen Demand (BOD) results are not yet available.

    Determinand / Compound Name 

    U/S 1 (Sample 1) 

    U/S 2 (Sample 2) 

    Ingress (Sample 3) 

    Waste (Sample 4) 

    D/S 1 (Sample 5)  

    D/S 2
     (Sample 6) 

    Unit 

    Temperature of Water 

    9.1 

    8.6 

    8.5 

    8.7 

    8.5 

    8.6 

    CEL 

    Conductivity at 25 C 

    697 

    610 

    677 

    1271 

    604 

    604 

    uS/cm 

    BOD : 5 Day ATU 

      

      

      

      

      

      

    mg/l 

    Chemical Oxygen Demand :- {COD} 

    29 

    12 

    24 

    95 

    13 

    13 

    mg/l 

    Ammoniacal Nitrogen as N 

    <0.03 

    <0.03 

    <0.03 

    3.2 

    <0.03 

    <0.03 

    mg/l 

    Nitrogen, Total Oxidised as N 

    1.9 

    6.8 

    2.2 

    <0.2 

    6.8 

    6.7 

    mg/l 

    Nitrite as N 

    0.032 

    0.011 

    0.04 

    <0.004 

    0.011 

    0.01 

    mg/l 

    Ammonia un-ionised as N 

    <0.00013 

    <0.00039 

    <0.00015 

    0.00935 

    <0.00038 

    <0.00038 

    mg/l 

    Solids, Suspended at 105 C 

    9.4 

    10 

    29 

    22 

    12 

    13 

    mg/l 

    Chloride 

    56 

    27 

    44 

    52 

    28 

    27 

    mg/l 

    Orthophosphate, reactive as P 

    0.11 

    0.079 

    0.072 

    0.03 

    0.078 

    0.08 

    mg/l 

    Visible oil or grease, significant trace: Present/Not found (1/0) 

    Not found 

    Not found 

    Not found 

    Not found 

    Not found 

    Not found 

    N/A 

    Salinity : In Situ 

    0.34 

    0.3 

    0.33 

    0.64 

    0.29 

    0.29 

    ppt 

    Oxygen, Dissolved, % Saturation 

    43.8 

    86.1 

    49.4 

    30.7 

    87 

    87.1 

    % 

    Aluminium 

    0.2 

    0.33 

    0.47 

    0.29 

    0.51 

    0.42 

    mg/l  

    Barium 

    0.023 

    0.013 

    0.02 

    0.053 

    0.014 

    0.014 

    mg/l  

    Calcium 

    99 

    96 

    110 

    220 

    97 

    97 

    mg/l  

    Iron 

    0.31 

    0.48 

    0.94 

    0.61 

    0.79 

    0.64 

    mg/l  

    Magnesium 

    5.1 

    5.2 

    5.4 

    9.7 

    5.3 

    5.3 

    mg/l  

    Manganese 

    0.041 

    0.017 

    0.034 

    1.2 

    0.026 

    0.021 

    mg/l  

    Potassium 

    6.2 

    3.8 

    5.2 

    5.6 

    3.8 

    3.8 

    mg/l  

    Sodium 

    31 

    17 

    24 

    36 

    17 

    17 

    mg/l  

    Strontium 

    0.33 

    0.24 

    0.33 

    0.76 

    0.24 

    0.24 

    mg/l  

    Zinc 

    0.0078 

      

    0.0084 

    0.047 

    0.0056 

    0.006 

    mg/l  

    Nickel 

      

      

      

    0.0064 

      

      

    mg/l  

    Copper 

      

      

      

    0.024 

      

      

    mg/l  

    Lead 

      

      

      

    0.0071 

      

      

    mg/l  

    (-)-Pinane-3-carboxylic acid 

      

      

      

    0.329 

      

      

    ug/l 

    (Propan-2-yloxy)carbohydrazide 

    0.035 

      

      

      

    0.012 

      

    ug/l 

    .alpha.,.alpha.'-Dihydroxy-m-diisopropylbenzene 

      

      

      

    0.194 

      

      

    ug/l 

    1-((1S,3aR,4R,7S,7aS)-4-Hydroxy-7-isopropyl-4-methyloctahydro-1H-inden-1-yl)ethanone 

      

      

      

    0.268 

      

      

    ug/l 

    1-(2-Thienyl)-1-propanone 

      

      

      

    0.041 

      

      

    ug/l 

    1(3H)-Isobenzofuranone 

      

      

      

    0.156 

      

      

    ug/l 

    1-(Ethylsulfonyl)piperazine 

      

      

      

    0.013 

      

      

    ug/l 

    1,3,5,7-Tetroxane 

      

      

      

    0.173 

      

      

    ug/l 

    1,3,5-Trially-1,3,5-triazine-2,4,6-trione 

      

      

      

    0.143 

      

      

    ug/l 

    1,3,5-Triazine-2,4,6(1H,3H,5H)-trione, 1,3,5-trimethyl- 

      

      

      

    0.038 

      

      

    ug/l 

    1,3-Benzenediol, monobenzoate 

      

    0.017 

      

      

      

      

    ug/l 

    1,3-Cyclohexadiene-1-carboxaldehyde, 2,6,6-trimethyl- 

      

      

      

    0.13 

      

      

    ug/l 

    1,3-Cyclohexanedione, 2,2,5,5-tetramethyl- 

      

      

      

    0.052 

      

      

    ug/l 

    1,3-Dimethyl-5-pylazolyl-2,4-dichlorobenzoate 

      

    0.034 

      

      

      

      

    ug/l 

    1,4-Dioxane 

      

      

      

    0.269 

      

      

    ug/l 

    1,8-Diazacyclotetradecane-2,7-dione 

      

      

      

    0.133 

      

      

    ug/l 

    1-Butanol, 2,3-dimethyl- 

    0.084 

    0.054 

    0.125 

    0.062 

    0.189 

    0.083 

    ug/l 

    1-Butanol, 4-(1-methylethoxy)- 

      

      

      

    0.089 

      

      

    ug/l 

    1-Butanone, 1-(2,4,5-trihydroxyphenyl)- 

      

      

      

    0.015 

      

      

    ug/l 

    1-Ethyl-2-pyrrolidone 

      

      

      

    0.595 

      

      

    ug/l 

    1H-Pyrazole, 5-methoxy-1,3-dimethyl- 

      

    0.012 

    0.013 

      

      

      

    ug/l 

    1-Pentanone, 1-(4-methylphenyl)- 

      

      

      

    0.023 

      

      

    ug/l 

    1-Propanol, 2-(2-hydroxypropoxy)- 

      

      

      

    0.183 

      

      

    ug/l 

    2-(2-(2-Butoxyethoxy)ethoxy)acetic acid 

      

      

      

    0.277 

      

      

    ug/l 

    2-(2-Butoxyethoxy)acetic acid 

      

      

      

    0.341 

      

      

    ug/l 

    2-(2-Chloroethoxy)-1,3,2-dioxaphospholan-2-one 

      

      

      

    0.014 

      

      

    ug/l 

    2-(2-Chloroethoxy)ethyl bis(2-chloroethyl) phosphate 

      

      

      

    0.221 

      

      

    ug/l 

    2(3H)-Benzothiazolone 

      

      

      

    2 

      

      

    ug/l 

    2(5H)-Furanone, 5-(acetyloxy)- 

      

    0.015 

      

      

      

      

    ug/l 

    2,2,4,4,5,5,7,7-Octamethyloctane 

    0.039 

      

      

      

    0.046 

      

    ug/l 

    2,2,5,5-Tetramethyl-3-hexanone 

      

    0.012 

    0.019 

      

      

      

    ug/l 

    2,3-Dimethylpentanoic acid 

      

      

      

    0.14 

      

      

    ug/l 

    2,4,7,9-Tetramethyl-5-decyne-4,7-diol 

      

    0.131 

    0.12 

    4.6 

    0.157 

    0.164 

    ug/l 

    2,4-Imidazolidinedione, 5-ethyl-5-methyl- 

      

      

      

    0.02 

      

      

    ug/l 

    2,6-Dimethoxyhydroquinone 

      

      

      

    0.018 

      

      

    ug/l 

    2-Chloroethyl benzoate 

      

      

    0.047 

    0.094 

      

      

    ug/l 

    2H-Pyran-2-one, tetrahydro-4-methyl- 

      

      

      

    0.015 

      

      

    ug/l 

    2-Pentanol, 2-methyl- 

      

      

      

      

    0.012 

    0.027 

    ug/l 

    2-Propanol, 1-(2-butoxy-1-methylethoxy)- 

      

      

      

    0.201 

      

      

    ug/l 

    2-Propanol, 1-(2-methoxy-1-methylethoxy)- 

      

      

      

    0.031 

      

      

    ug/l 

    2-Propanol, 1,3-dichloro- 

      

      

    0.013 

    0.226 

      

      

    ug/l 

    2-Propanol, 1-butoxy- 

      

      

      

    0.027 

      

      

    ug/l 

    2-Propanol, 1-chloro- 

      

      

      

    0.569 

      

      

    ug/l 

    2-Propanol, 1-chloro-, phosphate (3:1) 

      

      

    1.9 

    38 

      

      

    ug/l 

    2-Pyrrolidinone, 1-butyl- 

      

      

      

    0.056 

      

      

    ug/l 

    2-Pyrrolidinone, 1-methyl- 

      

      

      

    0.065 

      

      

    ug/l 

    2-Thio-2,4-oxazolidinedione 

      

      

      

    0.017 

      

      

    ug/l 

    2-Thiopheneacetamide, N,N-dibutyl- 

      

      

      

    0.074 

      

      

    ug/l 

    2-Thiophenecarboxylic acid, 4-nitrophenyl ester 

      

      

      

    0.035 

      

      

    ug/l 

    3,5-di-tert-Butyl-4-hydroxyphenylpropionic acid 

      

      

      

    1.5 

      

      

    ug/l 

    3,5-Heptanedione, 2,2,4,6,6-pentamethyl- 

      

      

    0.017 

      

      

      

    ug/l 

    3-Cyclohexen-1-ol, 4-methyl-1-(1-methylethyl)-, (R)- 

      

      

      

    0.079 

      

      

    ug/l 

    3-Ethyl-4-hydroxy-dihydro-furan-2-one 

      

      

      

    0.051 

      

      

    ug/l 

    3-Ethylheptanoic acid 

      

      

      

    0.065 

      

      

    ug/l 

    3-Heptanone, 2,4-dimethyl- 

      

      

      

      

    0.018 

      

    ug/l 

    3-Heptyne-2,6-dione, 5-methyl-5-(1-methylethyl)- 

      

      

      

    0.049 

      

      

    ug/l 

    3-Hexanol, 4-methyl- 

      

      

    0.027 

      

      

      

    ug/l 

    3-Hexen-1-ol, propanoate, (Z)- 

      

      

      

    0.027 

      

      

    ug/l 

    3-Pentanol, 3-methyl- 

      

      

      

    0.071 

      

      

    ug/l 

    3-Piperidinol, 1-ethyl- 

      

      

      

    0.054 

      

      

    ug/l 

    4,4-Dimethyl-1,2,3,4-tetrahydro-.gamma.-carboline 

      

      

      

    0.024 

      

      

    ug/l 

    4,5-Dimethoxy-2-hydroxyacetophenone 

      

      

      

    0.136 

      

      

    ug/l 

    4,6-Octadiyn-3-one, 2-methyl- 

      

      

      

      

    0.01 

      

    ug/l 

    4-Chlorobutyric acid, 4-isopropylphenyl ester 

      

      

      

    0.021 

      

      

    ug/l 

    4-Ethyl-2,6-dimethoxyphenol 

      

      

      

    0.062 

      

      

    ug/l 

    4-Octene-2,7-diol, 2,7-dimethyl-, Z- 

      

      

      

    0.054 

      

      

    ug/l 

    4-Piperidinone, 2,2,6,6-tetramethyl- 

      

      

      

    0.044 

      

      

    ug/l 

    4'-Propoxy-2-methylpropiophenone 

      

      

      

    0.124 

      

      

    ug/l 

    4-Propoxybenzoic acid trimethylsilyl ester 

      

      

      

    0.018 

      

      

    ug/l 

    5'-Hydroxy-2',3',4'-trimethylacetophenone 

      

      

      

    0.19 

      

      

    ug/l 

    5-Hydroxymethylfurfural 

      

      

      

    0.279 

      

      

    ug/l 

    7-Chloro-1-(4-fluorophenyl)heptan-1-one 

      

      

      

    0.035 

      

      

    ug/l 

    8-Hydroxycarvotanacetone 

      

      

      

    0.055 

      

      

    ug/l 

    Acetic acid ethenyl ester 

      

      

      

      

    0.019 

      

    ug/l 

    Acetic acid, (2,4-xylyl)- 

      

      

      

    0.148 

      

      

    ug/l 

    Acetyl valeryl 

      

      

      

    0.021 

      

      

    ug/l 

    Atrazine 

      

      

      

    2.9 

      

      

    ug/l 

    Atrazine desethyl 

      

      

      

    1.4 

      

      

    ug/l 

    Aziridinone, 1,3-bis(1,1-dimethylethyl)- 

      

      

      

    0.026 

      

      

    ug/l 

    Benzenamine, 4-methyl-N,N-bis(4-methylphenyl)- 

      

      

      

    0.022 

      

      

    ug/l 

    Benzeneacetic acid 

      

      

      

    0.529 

      

      

    ug/l 

    Benzenebutanoic acid, 2,5-dimethyl- 

      

      

      

    0.345 

      

      

    ug/l 

    Benzenemethanol, .alpha.,.alpha.,4-trimethyl- 

      

      

      

    0.228 

      

      

    ug/l 

    Benzenemethanol, .alpha.,.alpha.-dimethyl- 

      

      

      

    0.116 

      

      

    ug/l 

    Benzenemethanol, .alpha.-methyl- 

      

      

      

    0.027 

      

      

    ug/l 

    Benzenesulfonamide, 2-methyl- 

      

      

      

    0.256 

      

      

    ug/l 

    Benzenesulfonamide, 4-methyl- 

      

      

    0.251 

    7.2 

      

      

    ug/l 

    Benzenesulfonamide, N-butyl 

    0.222 

      

    0.565 

    3.8 

      

      

    ug/l 

    Benzenesulfonanilide 

      

      

      

    0.059 

      

      

    ug/l 

    Benzoic acid, 2,4,6-trimethyl- 

      

      

      

    0.435 

      

      

    ug/l 

    Benzoic acid, 2,6-dichloro- 

      

      

      

    0.029 

      

      

    ug/l 

    Benzoic acid, 3,5-bis(1,1-dimethylethyl)-4-hydroxy- 

      

      

      

    0.077 

      

      

    ug/l 

    Benzoic acid, 4-(1-methylethyl)- 

      

      

      

    0.095 

      

      

    ug/l 

    Benzoic acid, 4-methyl- 

      

      

      

    0.017 

      

      

    ug/l 

    Bicyclo[2.2.1]heptane-2,5-dione, 1,7,7-trimethyl- 

      

      

      

    0.035 

      

      

    ug/l 

    Bicyclo[3.1.1]heptan-2-one, 3,6,6-trimethyl- 

      

      

      

    0.34 

      

      

    ug/l 

    Bis(1-chloro-2-propyl)(3-chloro-1-propyl)phosphate 

      

      

    0.281 

    13 

      

      

    ug/l 

    Bis(1-chloro-2-propyl)-3-(3-chloropropoxy)propyl phosphate 

      

      

      

    0.487 

      

      

    ug/l 

    Bis(2-methoxyethoxy)methane 

      

      

      

    1.6 

      

      

    ug/l 

    Bis(3-chloro-1-propyl)(1-chloro-2-propyl)phosphate 

      

      

    0.018 

    1 

      

      

    ug/l 

    Bisphenol A 

      

    0.015 

    0.102 

    0.576 

      

    0.017 

    ug/l 

    Bromoform 

    0.017 

    0.017 

    0.011 

      

    0.014 

    0.012 

    ug/l 

    Butane, 2-methoxy-2-methyl- 

      

      

      

    0.074 

      

      

    ug/l 

    Butanoic acid, 2-ethyl-, methyl ester 

      

      

      

    0.115 

      

      

    ug/l 

    Butanoic acid, 2-methyl- 

      

      

      

    0.02 

      

      

    ug/l 

    Butanoic acid, 3-methyl- 

      

      

      

    0.142 

      

      

    ug/l 

    Butanoic acid, methyl ester 

      

      

    0.016 

      

      

      

    ug/l 

    Caffeine 

    0.026 

    0.053 

    0.19 

      

    0.065 

    0.063 

    ug/l 

    Caprolactam 

      

      

      

    19 

      

      

    ug/l 

    Carbamazepine 

      

    0.016 

      

      

    0.023 

    0.019 

    ug/l 

    Carbonic acid, 2-ethoxyethyl 2-methoxyethyl ester 

      

      

      

    0.038 

      

      

    ug/l 

    Coumarin 

      

      

      

    0.177 

      

      

    ug/l 

    Cyclobutanone, 2,3,3-trimethyl- 

      

      

      

    0.014 

      

      

    ug/l 

    Cyclohexanecarboxylic acid, 4-(1,5-dimethyl-3-oxohexyl)-, methyl ester, cis- 

      

      

      

    0.454 

      

      

    ug/l 

    Cyclohexanemethanol, 4-hydroxy-.alpha.,.alpha.,4-trimethyl- 

      

      

      

    0.41 

      

      

    ug/l 

    Cyclohexanol 

      

      

      

    0.033 

      

      

    ug/l 

    Cyclopenta[g]-2-benzopyran, 1,3,4,6,7,8-hexahydro-4,6,6,7,8,8-hexamethyl- 

      

      

      

      

    0.009 

      

    ug/l 

    Decyl acrylate 

      

    0.029 

    0.059 

      

      

      

    ug/l 

    Dehydroabietic acid 

      

      

      

    0.291 

      

      

    ug/l 

    Didesmethyldiphenhydramine 

      

      

      

    0.024 

      

      

    ug/l 

    Diethyl carbitol 

      

      

      

    0.055 

      

      

    ug/l 

    Diethyl ethylphosphonate 

      

      

      

    0.049 

      

      

    ug/l 

    Dimethyl sulfone 

      

      

      

    0.061 

      

      

    ug/l 

    Diphenyl sulfone 

      

      

    0.08 

    0.363 

      

    0.005 

    ug/l 

    Disulfide, diheptyl 

      

      

      

    0.095 

      

      

    ug/l 

    DL-4,5-Octanediol 

      

      

      

    0.033 

      

      

    ug/l 

    Ethanol, 2-butoxy-, phosphate (3:1) 

      

      

      

    0.285 

      

      

    ug/l 

    Ethanol, 2-ethoxy- 

      

      

      

    0.046 

      

      

    ug/l 

    Ethanone, 1-(3-hydroxy-4-methoxyphenyl)- 

      

      

      

    0.019 

      

      

    ug/l 

    Ethiolate 

      

      

      

    0.167 

      

      

    ug/l 

    Ethyl 4-(ethyloxy)-2-oxobut-3-enoate 

      

      

      

    0.057 

      

      

    ug/l 

    Eucalyptol 

      

      

      

    0.027 

      

      

    ug/l 

    Fenchone 

      

      

      

    0.028 

      

      

    ug/l 

    Fluoranthene 

    0.007 

    0.004 

    0.005 

      

    0.009 

    0.009 

    ug/l 

    Formamide, N,N-dimethyl- 

      

      

      

    0.025 

      

      

    ug/l 

    Fumaric acid, 4-cyanophenyl pentyl ester 

      

      

      

    0.098 

      

      

    ug/l 

    Fumaronitrile 

      

      

      

      

      

    0.012 

    ug/l 

    hexadecyl acrylate 

      

      

      

    0.418 

      

      

    ug/l 

    Hexamethoxymethylmelamine 

      

      

      

      

    0.388 

    0.265 

    ug/l 

    Hexane, 3,3-dimethyl- 

      

      

      

    0.028 

      

      

    ug/l 

    Hexanoic acid, 3,5,5-trimethyl- 

      

      

      

    0.229 

      

      

    ug/l 

    Hexathiane 

      

      

      

    0.431 

      

      

    ug/l 

    Ibuprofen 

      

      

      

    0.174 

      

      

    ug/l 

    l-Alanine, N-(2,3,4-trifluorobenzoyl)-, methyl ester 

      

      

      

    0.056 

      

      

    ug/l 

    L-Fenchone 

      

      

      

    0.028 

      

      

    ug/l 

    m-Aminophenylacetylene 

      

      

      

    0.523 

      

      

    ug/l 

    Mecoprop 

      

      

      

    5.3 

      

      

    ug/l 

    N,N,N',N'-Tetraacetylethylenediamine 

      

      

      

      

    0.042 

    0.051 

    ug/l 

    N,N-Diethyl-m-toluamide 

      

    0.016 

    0.014 

    0.388 

    0.013 

    0.016 

    ug/l 

    N-Cyclohexyl-N'-methylurea, N'-methyl 

      

      

      

    0.024 

      

      

    ug/l 

    Neodecanoic acid 

      

      

      

    0.612 

      

      

    ug/l 

    n-Hexadecanoic acid 

    0.156 

      

      

      

      

      

    ug/l 

    Octadecanoic acid 

      

      

      

    0.523 

      

      

    ug/l 

    Pentanoic acid, 5-hydroxy-, p-t-butylphenyl ester 

      

    0.011 

    0.014 

      

      

      

    ug/l 

    Phenylacetamide, 4-fluoro-N-propyl- 

      

      

      

    0.014 

      

      

    ug/l 

    Phosphoramidous difluoride 

      

      

      

    0.021 

      

      

    ug/l 

    Phosphoric acid, 2-chloroethenyl dimethyl ester 

      

      

    0.016 

      

      

      

    ug/l 

    Phthalic anhydride 

      

      

      

    0.022 

      

      

    ug/l 

    Propanoic acid, 2-methyl- 

      

      

      

    0.039 

      

      

    ug/l 

    Propanol, [(butoxymethylethoxy)methylethoxy]- 

      

      

      

    0.032 

      

      

    ug/l 

    Propyzamide 

      

    0.018 

    0.016 

      

    0.017 

    0.021 

    ug/l 

    Pyrazine 

      

      

      

    0.08 

      

      

    ug/l 

    Pyrene 

      

      

    0.004 

      

    0.006 

    0.007 

    ug/l 

    Pyridine, 2,3,6-trimethyl- 

      

    0.021 

    0.011 

      

      

    0.011 

    ug/l 

    Sal Ethyl carbonate 

      

      

      

    0.024 

      

      

    ug/l 

    Sulfone, methyl phenyl 

      

      

      

    0.048 

      

      

    ug/l 

    Sulfur (S8) 

      

      

      

    9.5 

      

      

    ug/l 

    Terpineol 

      

      

      

    1.4 

      

      

    ug/l 

    Tetramethylfuran 

      

      

      

    0.04 

      

      

    ug/l 

    Tri-(2-chloroethyl) phosphate 

      

      

    0.095 

    14 

    0.023 

      

    ug/l 

    Tributyl phosphate 

      

      

      

    0.055 

      

      

    ug/l 

    Tricyclo[2.2.1.0(2,6)]heptane, 1,3,3-trimethyl- 

    0.162 

      

      

      

      

      

    ug/l 

    Triethyl Citrate 

      

    0.327 

      

      

    0.422 

    0.358 

    ug/l 

    Triethyl phosphate 

      

      

      

    1.6 

      

      

    ug/l 

    Triisopropylphosphate 

      

      

      

    0.071 

      

      

    ug/l 

    Tris-(1,3-dichloroisopropyl) phosphate 

      

      

    0.42 

    2.9 

      

      

    ug/l 

    Tris(3-chloropropyl) phosphate 

      

      

      

    0.031 

      

      

    ug/l 

    Valproic Acid 

      

      

      

    0.03 

      

      

    ug/l 















    top of the page

    Analytical results from samples taken 4 December 2025

    Samples were taken from the following locations:

    Sample

    Location (NGR)

    U/S Tributary 1 (Sample 1)

    SP 50747 14126

    U/S Tributary 2 (Sample 2)

    SP 50764 13829

    Ingress (Sample 3)

    SP 50791 13850

    Waste (Sample 4)

    SP 50781 14094

    D/S River Cherwell 1 (Sample 3)

    SP 50916 13798

    D/S River Cherwell 2 (Sample 4)

    SP 50943 13253

     

     

     

     

     

     

     

     

    U/S = Upstream of the waste

    D/S = Downstream of the waste

    Waste = Sample taken from run-off/standing groundwater that has collated around the waste site boundary

    NGR = National Grid Reference

     

    Determinand / Compound Name

    U/S 1 

    (Sample 1)

    U/S 2 

    (Sample 2)

    Ingress 

    (Sample 3)

    Waste 

    (Sample 4)

    D/S 1 

    (Sample 5) 

    D/S 2

    (Sample 6)

    Unit

    Ammonia un-ionised as N

    <0.00014

    <0.00035

    <0.00035

    0.00548

    <0.00035

    <0.00037

    mg/l

    Ammoniacal Nitrogen as N

    <0.03

    <0.03

    <0.03

    0.78

    <0.03

    <0.03

    mg/l

    BOD : 5 Day ATU

    <3

     

     

     

    <3

     

    mg/l

    Chemical Oxygen Demand :- {COD}

    21

    17

    16

    25

    18

    14

    mg/l

    Chloride

    80

    30

    30

    54

    30

    30

    mg/l

    Conductivity at 25 C

    806

    570

    571

    870

    566

    563

    uS/cm

    Nitrite as N

    0.026

    0.009

    0.0083

    0.29

    0.0087

    0.0091

    mg/l

    Nitrogen, Total Oxidised as N

    0.71

    7.6

    7.5

    3.3

    7.6

    7.6

    mg/l

    Orthophosphate, reactive as P

    0.094

    0.11

    0.11

    <0.01

    0.11

    0.11

    mg/l

    Oxygen, Dissolved, % Saturation

    52.5

    87.6

    87.6

    79.1

    87.4

    88.3

    %

    pH

    7.48

    7.88

    7.88

    7.71

    7.89

    7.91

    PHUNITS

    Salinity : In Situ

    0.4

    0.28

    0.28

    0.43

    0.28

    0.27

    ppt

    Solids, Suspended at 105 C

    <6

    30

    31

    8.3

    27

    28

    mg/l

    Temperature of Water

    7.4

    7.7

    7.5

    6

    7.4

    7.4

    CEL

    Visible oil or grease, significant trace: Present/Not found (1/0)

    Not found

    Not found

    Not found

    Not found

    Not found

    Not found

    N/A

    Aluminium

    0.091

    1.3

    1.4

    0.081

    1.1

    1.1

    mg/l

    Barium

    0.022

    0.015

    0.016

    0.029

    0.014

    0.014

    mg/l

    Calcium

    120

    87

    87

    160

    88

    85

    mg/l

    Iron

    0.18

    2.1

    2.4

    0.14

    1.8

    1.9

    mg/l

    Magnesium

    5.4

    5.4

    5.5

    5.9

    5.5

    5.4

    mg/l

    Manganese

    0.11

    0.043

    0.038

    0.1

    0.032

    0.035

    mg/l

    Potassium

    3.5

    4.5

    4.4

    1.4

    4.3

    4.1

    mg/l

    Sodium

    38

    19

    19

    36

    19

    18

    mg/l

    Strontium

    0.42

    0.2

    0.23

    0.51

    0.23

    0.23

    mg/l

    Zinc

     

    0.015

    0.013

    0.0053

    0.01

    0.01

    mg/l

    1,2:5,6-Di-O-isopropylidene-a-d-ribohexafurnos-3-ulose

     

     

     

     

    0.01

     

    ug/l

    1,3-Benzenediol, monobenzoate

    0.01

     

     

     

     

     

    ug/l

    1,3-Dimethyl-5-pylazolyl-2,4-dichlorobenzoate

    0.027

    0.02

    0.02

     

    0.023

     

    ug/l

    1-Butanol, 2,3-dimethyl-

    0.023

     

    0.12

    0.032

    0.087

    0.142

    ug/l

    1-Dodecanamine, N,N-dimethyl-

    0.024

     

     

     

     

     

    ug/l

    1-Hexene, 4,5-dimethyl-

     

    0.042

     

     

     

     

    ug/l

    1H-Pyrazolo[3,4-d]pyrimidin-4-amine

    0.011

     

     

     

     

     

    ug/l

    1-Pentanone, 1-(4-methylphenyl)-

     

     

    0.012

    0.022

     

     

    ug/l

    2,4,7,9-Tetramethyl-5-decyne-4,7-diol

    0.011

    0.065

    0.099

    0.097

    0.082

    0.081

    ug/l

    2,4-Azetidinedione, 3,3-diethyl-1-methyl-

     

     

     

     

    0.012

     

    ug/l

    2-Butanol, 2,3-dimethyl-

     

     

     

    0.049

     

     

    ug/l

    2-Cyanoethyl acrylate

     

     

     

    0.037

     

     

    ug/l

    2-Ethylhexanoic acid

     

     

     

     

    0.026

     

    ug/l

    2-Propanol, 1-chloro-, phosphate (3:1)

    0.055

     

    0.067

    5.6

    0.084

    0.055

    ug/l

    2-Propenoic acid, 2-methyl-, (tetrahydro-2-furanyl)methyl ester

     

    0.027

     

     

     

     

    ug/l

    2-Thiobarbituric acid, tris(tert-butyldimethylsilyl) deriv.

     

     

    0.012

     

     

     

    ug/l

    3-Buten-2-one, 3-methyl-

     

     

    0.021

     

     

    0.081

    ug/l

    3-Hexanol, 5-methyl-

    0.037

     

     

     

    0.023

     

    ug/l

    3H-pyrazol-3-one, 2,4-dihydro-2-phenyl-5-(phenylamino)-

    0.048

     

     

     

     

     

    ug/l

    3-Penten-2-one

     

     

     

     

    0.017

    0.049

    ug/l

    acenaphthene

     

     

     

     

    0.002

     

    ug/l

    Anthracene

     

     

     

     

    0.003

     

    ug/l

    Atrazine

     

     

     

    0.138

     

     

    ug/l

    Atrazine desethyl

     

     

     

    0.094

     

     

    ug/l

    Benz[a]anthracene

     

     

     

     

    0.01

     

    ug/l

    Benzaldehyde, 4-benzyloxy-3-methoxy-2-nitro-

     

     

     

    0.02

     

     

    ug/l

    Benzene, 1-ethyl-2,4-dimethyl-

    0.013

     

     

     

     

     

    ug/l

    Benzenesulfonamide, 4-methyl-

     

     

     

    0.372

     

     

    ug/l

    Benzenesulfonamide, N-butyl

     

     

     

    0.612

     

     

    ug/l

    Benzo[a]pyrene

     

     

     

     

    0.006

     

    ug/l

    Bis(1-chloro-2-propyl)(3-chloro-1-propyl)phosphate

     

     

     

    0.978

     

     

    ug/l

    Bis(2-methoxyethoxy)methane

     

     

     

    0.098

     

     

    ug/l

    Bis(3-chloro-1-propyl)(1-chloro-2-propyl)phosphate

     

     

     

    0.064

     

     

    ug/l

    Butane, 2-chloro-2-methyl-

     

    0.097

     

     

     

     

    ug/l

    Butane, 2-methoxy-2-methyl-

    0.014

     

    0.012

     

    0.012

     

    ug/l

    Caffeine

    0.006

    0.048

    0.065

    0.614

    0.051

    0.041

    ug/l

    Chrysene

     

     

    0.007

     

    0.011

     

    ug/l

    Coumarin

     

     

     

    0.024

     

     

    ug/l

    Cyclopenta(cd)pyrene, 3,4-dihydro-

     

     

     

     

    0.01

     

    ug/l

    Diphenyl sulfone

     

    0.005

     

    0.195

    0.006

     

    ug/l

    Ethanol, 2-(trimethylsilyl)-

    0.011

     

     

     

     

     

    ug/l

    Ethanone, 1-[4-(1-hydroxy-1-methylethyl)phenyl]-

     

     

     

    0.032

     

     

    ug/l

    Ethanone, 2,2-dimethoxy-1,2-diphenyl-

     

     

     

    0.089

     

     

    ug/l

    Flufenacet

     

     

    0.015

     

    0.014

     

    ug/l

    Fluoranthene

    0.004

    0.006

    0.017

    0.003

    0.027

    0.025

    ug/l

    Furan, 2-methoxy-

     

     

    0.012

     

     

     

    ug/l

    Hexadecanoic acid, methyl ester

    0.018

     

     

     

     

     

    ug/l

    Hexane, 3,3-dimethyl-

     

    0.019

     

     

     

     

    ug/l

    Isonicotinic acid, 2-phenylethyl ester

     

    0.028

     

     

     

     

    ug/l

    Methyl Isobutyl Ketone

    0.012

     

     

     

     

     

    ug/l

    Methyl stearate

    0.01

     

     

     

     

     

    ug/l

    N,N,N',N'-Tetraacetylethylenediamine

     

     

     

     

    0.043

     

    ug/l

    N,N-Diethyl-m-toluamide

     

     

    0.012

     

     

     

    ug/l

    n-Decanoic acid

     

    0.017

     

     

     

     

    ug/l

    n-Hexadecanoic acid

     

    0.031

     

     

     

     

    ug/l

    Nitrous acid, cyclohexyl ester

     

     

     

     

    0.01

     

    ug/l

    Nonanal

    0.015

     

    0.016

     

     

     

    ug/l

    Octadecanoic acid

    0.219

    0.023

    0.176

    0.089

    0.112

    0.031

    ug/l

    Pentanal, 2-methyl-

    0.028

     

     

     

     

     

    ug/l

    Pentanoic acid, 5-hydroxy-, 2,4-di-t-butylphenyl esters

    0.024

     

     

     

     

     

    ug/l

    Phenol, 2,4-bis(1,1-dimethylethyl)-, phosphite (3:1)

     

    0.053

     

     

    0.513

     

    ug/l

    Phthalimide

    0.012

     

     

     

     

     

    ug/l

    Propane, 1,1-dimethoxy-

     

     

    0.012

     

     

     

    ug/l

    Propanoic acid

    0.013

     

     

     

     

     

    ug/l

    Propyzamide

     

    0.026

    0.042

     

    0.043

    0.037

    ug/l

    Pyrene

     

    0.004

    0.013

     

    0.017

    0.017

    ug/l

    Pyridine, 2,3,6-trimethyl-

    0.01

     

     

     

     

     

    ug/l

    Sulfur (S8)

     

     

    0.006

     

    0.006

     

    ug/l

    trans-3-Penten-2-ol

     

     

    0.11

     

    0.079

    0.118

    ug/l

    Tri-(2-chloroethyl) phosphate

     

     

     

    1.1

     

     

    ug/l

    Tri-allate

     

    0.011

    0.012

     

    0.014

    0.014

    ug/l

    Tricyclo[2.2.1.0(2,6)]heptane, 1,3,3-trimethyl

     

    0.101

     

     

     

     

    ug/l

    Triethyl Citrate

     

     

    0.285

     

    0.241

     

    ug/l

    Triethyl phosphate

     

     

     

    0.041

     

     

    ug/l

    Triphenylphosphine oxide

     

     

     

    0.077

     

     

    ug/l

    Tris-(1,3-dichloroisopropyl) phosphate

     

     

     

    0.149

     

     

    ug/l

     

    *This data includes that obtained by using the GC-MS analytical technique: further guidance on this is available here: Water quality monitoring data GC-MS and LC-MS semi-quantitative screen

    Disclaimer for GCMS Results: All results are an approximate concentration. Where accreditation is claimed this is only for the identification of the substance and not the quantified amount. 

    The compounds identified in the GCMS results fit into one of four criteria, which can be pulled from the original dataset on MIDAS if required:

      1. "The following compounds were identified using the NLS Screening database in combination with the National Institute of Standards and Technology Library (NIST) and have a Spectral Fit of >80%"
      2. "The following compounds were identified using the NLS Screening database in combination with the National Institute of Standards and Technology Library (NIST) and have a Spectral Fit of <80%"
      3. "The following compounds were identified using the National Institute of Standards and Technology Library (NIST) and have a Spectral Fit of >80%"
      4. "The following compounds were identified using the National Institute of Standards and Technology Library (NIST) and have a Spectral Fit of <80%"  

     

    Use limitation statement

    There are no public access constraints to this data. Use of this data is subject to the licence identified.

    Licence

    Open Government Licence

    Attribution statement

    © Environment Agency copyright and/or database right 2025. All rights reserved.

    top of the page

    Analytical results from samples taken 28 November 2025

    Samples were taken from the following locations:

    Sample

    Location (NGR)

    U/S Tributary 1 (Sample 1)

    SP 50747 14126

    U/S Tributary 2 (Sample 2)

    SP 50764 13829

    D/S River Cherwell 1 (Sample 3)

    SP 50916 13798

    D/S River Cherwell 2 (Sample 4)

    SP 50943 13253

     

     

     

     

     

     

    U/S = Upstream of the waste

    D/S = Downstream of the waste

    NGR = National Grid Reference

     

    Determinand / Compound Name

    U/S 1

    (Sample 1)

    U/S 2

    (Sample 2)

    D/S 1

    (Sample 3)

    D/S 2 

    (Sample 4)

    Unit

    Ammonia un-ionised as N

    0.00015

    <0.00038

    <0.0004

    <0.0004

    mg/l

    Ammoniacal Nitrogen as N

    0.032

    <0.03

    <0.03

    <0.03

    mg/l

    BOD : 5 Day ATU

    <3

    <3

    <3

    <3

    mg/l

    Chemical Oxygen Demand :- {COD}

    32

    11

    10

    10

    mg/l

    Chloride

    47

    35

    35

    34

    mg/l

    Conductivity at 25 C

    647

    659

    654

    654

    uS/cm

    Nitrite as N

    <0.004

    0.0087

    0.0079

    0.0077

    mg/l

    Nitrogen, Total Oxidised as N

    0.22

    6.9

    7

    6.9

    mg/l

    Orthophosphate, reactive as P

    0.081

    0.11

    0.1

    0.1

    mg/l

    Oxygen, Dissolved, % Saturation

    53.1

    90

    90.2

    89.2

    %

    pH

    7.47

    7.92

    7.92

    7.95

    PHUNITS

    Salinity : In Situ

    0.32

    0.32

    0.32

    0.32

    ppt

    Solids, Suspended at 105 C

    <6

    12

    11

    12

    mg/l

    Temperature of Water

    8.4

    7.5

    8.1

    7.4

    CEL

    Visible oil or grease, significant trace: Present/Not found (1/0)

    Not found

    Not found

    Not found

    Not found

    N/A

    Aluminium

    0.031

    0.22

    0.31

    0.27

    mg/l

    Barium

    0.016

    0.012

    0.013

    0.013

    mg/l

    Calcium

    100

    99

    100

    100

    mg/l

    Iron

    0.086

    0.48

    0.67

    0.59

    mg/l

    Magnesium

    4.6

    5.8

    5.9

    5.9

    mg/l

    Manganese

    0.08

    0.015

    0.022

    0.019

    mg/l

    Potassium

    2.8

    4.3

    4.4

    4.4

    mg/l

    Sodium

    22

    22

    22

    22

    mg/l

    Strontium

    0.34

    0.25

    0.26

    0.26

    mg/l

    Zinc

     

     

    0.005

    0.0051

    mg/l

    1(3H)-Isobenzofuranone, 3,3-dimethyl-

    0.011

    0.015

     

    0.011

    ug/l

    1,2-Benzenedicarboxylic acid

    0.014

     

     

     

    ug/l

    1,2-Bis(3,5,5-trimethyl-2-cyclohexenylidene)hydrazine

     

    0.012

     

    0.011

    ug/l

    1,3-Dimethyl-5-pylazolyl-2,4-dichlorobenzoate

    0.016

    0.018

    0.016

    0.028

    ug/l

    1-Decanamine, N-decyl-N-methyl-

    0.018

     

     

     

    ug/l

    1-Dodecanamine, N,N-dimethyl-

    0.705

    0.024

     

     

    ug/l

    1-Hexene, 4,5-dimethyl-

     

    0.031

     

     

    ug/l

    1-Pentanol, 4-methyl-2-propyl-

     

     

    0.034

    0.036

    ug/l

    1-Pentene, 2,4,4-trimethyl-

    0.011

     

     

     

    ug/l

    1-Tetradecanamine, N,N-dimethyl-

    0.142

     

     

     

    ug/l

    2,2,4-Trimethyl-1,3-pentanediol diisobutyrate

     

     

     

    0.013

    ug/l

    2,2-Dimethylpropionic acid, 4-methylpentyl ester

     

    0.016

     

     

    ug/l

    2,3,4,5-Tetrafluorobenzyl alcohol, 2-methylpropyl ether

     

     

     

    0.009

    ug/l

    2,3-Dihydro-2-methyl-5-ethylfuran

    0.02

     

     

     

    ug/l

    2,4,7,9-Tetramethyl-5-decyne-4,7-diol

     

    0.067

    0.082

    0.077

    ug/l

    2,4-Dichlorobenzamide

     

     

     

    0.044

    ug/l

    2-Chloroethyl benzoate

     

     

     

    0.021

    ug/l

    2-Ethyl-1-butanol, trifluoroacetate

     

     

    0.012

    0.013

    ug/l

    2-Fluoro-6-trifluoromethylbenzoic acid, 4-nitrophenyl ester

     

     

     

    0.324

    ug/l

    2-Propanol, 1-chloro-, phosphate (3:1)

    0.043

    0.06

    0.083

    0.087

    ug/l

    3,7-Dimethyl-1-phenylsulfonyl-2,6-octadiene

     

     

     

    0.011

    ug/l

    3-Buten-2-one, 3-methyl-

     

     

     

    0.009

    ug/l

    3-Penten-2-one

     

    0.009

     

     

    ug/l

    4-fluorophenyl 4-(4-pentylcyclohexyl)benzoate

     

    0.009

     

     

    ug/l

    4-Methyl-3-heptanol, trifluoroacetate

    0.03

     

     

     

    ug/l

    5-(4-Hexyloxybenzoyloxy)-2-(4-nitrophenyl)pyrimidine

     

    0.022

     

     

    ug/l

    Benzoic acid, (4-benzoyloxy-2-chlorophenyl) ester

     

     

     

    0.01

    ug/l

    Butane, 2-chloro-2-methyl-

     

    0.12

    0.109

    0.095

    ug/l

    Butane, 2-methoxy-2-methyl-

    0.011

    0.011

    0.014

    0.011

    ug/l

    Butanoic acid, 2-pentenyl ester, (Z)-

     

     

    0.009

     

    ug/l

    Caffeine

    0.009

    0.075

    0.099

    0.075

    ug/l

    Carbamazepine

     

    0.022

    0.029

    0.028

    ug/l

    Coumarin

     

     

     

    0.003

    ug/l

    Crotamiton

     

    0.023

     

     

    ug/l

    Cyclohexane, (1,1-dimethylethyl)-

    0.012

     

     

     

    ug/l

    Cyclopenta[g]-2-benzopyran, 1,3,4,6,7,8-hexahydro-4,6,6,7,8,8-hexamethyl-

     

     

    0.015

    0.009

    ug/l

    Diethylcyanamide

    0.011

     

     

     

    ug/l

    Diphenyl sulfone

     

    0.007

    0.008

    0.007

    ug/l

    Dodecylmethylbenzylamine

    0.079

     

     

     

    ug/l

    Ethanedioic acid, dibutyl ester

     

     

    0.01

     

    ug/l

    Ethanol, 2-(trimethylsilyl)-

     

     

    0.011

     

    ug/l

    Ethanone, 1,1'-(1,4-phenylene)bis-

     

     

    0.013

     

    ug/l

    Ethanone, 1-[4-(1-hydroxy-1-methylethyl)phenyl]-

     

    0.012

    0.015

     

    ug/l

    Flufenacet

     

    0.018

    0.023

     

    ug/l

    Fluoranthene

    0.004

    0.003

    0.003

    0.003

    ug/l

    Furan, 2-methoxy-

     

     

     

    0.008

    ug/l

    Furan, 2-methoxy-ug/l

     

    0.01

     

     

    ug/l

    Isopropyl palmitate

     

     

     

    0.813

    ug/l

    Metacetamol

     

    0.01

    0.012

    0.011

    ug/l

    Methyl stearate

     

     

    0.015

    0.013

    ug/l

    Methyl stearate 0.018 Nonanal

    0.014

     

     

     

    ug/l

    N,N,N',N'-Tetraacetylethylenediamine

     

    0.056

    0.066

    0.047

    ug/l

    N,N-Diethyl-m-toluamide

     

    0.015

    0.017

    0.016

    ug/l

    Neopentane

     

     

     

    0.009

    ug/l

    n-Hexadecanoic acid

    0.354

     

     

     

    ug/l

    Nonanal

     

    0.014

    0.018

    0.015

    ug/l

    Octadecanoic acid

    0.365

    0.242

    0.262

    0.265

    ug/l

    Pentanoic acid, 5-hydroxy-, 2,4-di-t-butylphenyl esters

    0.025

    0.024

    0.031

    0.019

    ug/l

    Pentanoic acid, 5-hydroxy-, p-t-butylphenyl ester

     

     

     

    0.013

    ug/l

    Phenol, 2,4-bis(1,1-dimethylethyl)-, phosphite (3:1)

    0.262

    0.725

    1.3

    0.837

    ug/l

    Propanoic acid

    0.014

     

     

     

    ug/l

    Propyzamide

     

    0.041

    0.046

    0.046

    ug/l

    Pyrene

     

     

    0.003

    0.002

    ug/l

    Pyridine, 2,3,6-trimethyl-

     

     

    0.011

     

    ug/l

    Succinic acid, di(4-trifluoromethoxybenzyl) ester

     

     

    0.48

     

    ug/l

    Sulfurous acid, 2-ethylhexyl hexyl ester

     

    0.046

     

     

    ug/l

    TATP

     

     

    0.012

     

    ug/l

    Tetradecanoic acid, 10,13-dimethyl-, methyl ester

    0.016

     

     

    0.015

    ug/l

    Thiophene, 2,5-di(benzoylthio)-

     

    0.009

     

     

    ug/l

    Tri-allate

     

    0.008

    0.006

    0.012

    ug/l

    Triethyl Citrate

     

    0.208

    0.325

    0.366

    ug/l

    Trifluoroacetic acid, 2-tetrahydrofurylmethyl ester

    0.012

    0.018

     

    0.008

    ug/l

     

    *This data includes that obtained by using the GC-MS analytical technique: further guidance on this is available here: Water quality monitoring data GC-MS and LC-MS semi-quantitative screen

    Disclaimer for GCMS Results: All results are an approximate concentration. Where accreditation is claimed this is only for the identification of the substance and not the quantified amount. 

    The compounds identified in the GCMS results fit into one of four criteria, which can be pulled from the original dataset on MIDAS if required:

      1. "The following compounds were identified using the NLS Screening database in combination with the National Institute of Standards and Technology Library (NIST) and have a Spectral Fit of >80%"
      2. "The following compounds were identified using the NLS Screening database in combination with the National Institute of Standards and Technology Library (NIST) and have a Spectral Fit of <80%"
      3. "The following compounds were identified using the National Institute of Standards and Technology Library (NIST) and have a Spectral Fit of >80%"
      4. "The following compounds were identified using the National Institute of Standards and Technology Library (NIST) and have a Spectral Fit of <80%" 

      

    Use limitation statement

    There are no public access constraints to this data. Use of this data is subject to the licence identified.

    Licence

    Open Government Licence

    Attribution statement

    © Environment Agency copyright and/or database right 2025. All rights reserved.

    top of the page