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  • Third Energy UK Gas Limited

    Air quality impact assessment of operations at the

    Kirby Misperton A wellsite

    Report 150332

    Date 17 September 2015

    Revision 10

  • Report No.150332 Page 1 of 41

    Revision 10

    17 September 2015

    AIR QUALITY IMPACT ASSESSMENT OF OPERATIONS AT THE KIRBY MISPERTON A WELLSITE THIRD ENERGY UK GAS LIMITED

    Report prepared for

    Third Energy UK Gas Limited

    Knapton Generating station

    East Knapton

    Malton

    North Yorkshire

    YO17 8JF

    Report prepared by

    Environmental Scientifics Group Limited Unit D

    Bankside Trade Park

    Cirencester

    GL7 1YT

    Author

  • Report No.150332 Page 2 of 41

    Revision 10

    Third Energy UK Gas Limited Kirby Misperton

    ISSUE HISTORY

    Revision Date Approved

    150332,0 2 April 2015

    First issue

    150332,1 7 April 2015

    Minor amendments to text following client review.

    150332,2 10 April 2015

    Minor amendments to text following further client review.

    150332,3 17 April 2015

    Addition of releases from site vehicle movements to air quality impact and greenhouse gas release inventory (section 4). Addition of recent results of baseline air quality monitoring (section 2.4).

    150332,4 7 May 2015

    Amendements to vehicle movement schedule.

    150332,5 15 May 2015

    Clarification of comments on the air quality impact of nitrogen dioxide at residential locations on pages 23 and 24.

    150332,6 12 June 2015

    Amendments to account for the expansion of the Caravan Park and the addition of specific comments considering air quality impact at the Caravan site and the Flamingo Land Theme Park locations (sections 3 and 4, Annex A).

    150332,7 29 June 2015

    Amendments to the vehicle movement schedule and duration of operating phases (Section 3) with corresponding revisions to the air quality assessment and greenhouse gas inventory (Section 4).

    150332,8 30 June 2015

    Amendments to the vehicle movement schedule and extension of production phase from 1 to 9 years (Section 3) with corresponding revisions to the air quality assessment and greenhouse gas inventory (Section 4).

    150332,9 29 July 2015

    Amendments following issue of Schedule 5 notice. Table 3.10 revised and inclusion of consideration of benzene in assessment of fugitive releases (sections 3.6 and 4.4).

    150332,10 17 September 2015

    Amendments to section 2.4 to update details of recent baseline air quality monitoring.

  • Report No.150332 Page 3 of 41

    Revision 10

    Third Energy UK Gas Limited Kirby Misperton

    CONTENTS

    Page No. COVER 1 ISSUE HISTORY 2 CONTENTS 3 0 SUMMARY 4 1 INTRODUCTION 5 1.1 Scope of study 5 1.2 General approach 5 1.3 Structure of report 5 2 POLICY CONTEXT AND ASSESSMENT CRITERIA 6 2.1 Context of assessment 6 2.2 Pollutants from well operations 6 2.3 Air quality standards 7 2.4 Background air quality in Kirby Misperton 8 3 MODELLING METHODOLOGY 10 3.1 Assessment area 10 3.2 Buildings 11 3.3 Meteorology 11 3.4 Terrain 13 3.5 Pollutant releases from point sources 14 3.6 Pollutant releases from fugitive releases 18 3.7 Nitrogen and acid deposition 20 3.8 Modelling scenarios 20 4 MODELLING RESULTS 21 4.1 Impact of releases around the site boundary 21 4.2 Impact of releases at the nearest residential locations 21 4.3 Impact of process releases at sensitive nature conservation

    sites 26

    4.4 Impact of fugitive releases 28 4.5 Releases of greenhouse gases 28 5 CONCLUSIONS 31 6 REFERENCES 32 Annex A Dispersion model contour plots 33 Annex B Modelling files 41

  • Report No.150332 Page 4 of 41

    Revision 10

    Third Energy UK Gas Limited Kirby Misperton

    0 SUMMARY

    A dispersion modelling assessment using the ADMS 5 model was employed to predict the impact on local air quality of discharges of important pollutants from well operations at the Kirby Misperton A (KMA) wellsite. All operating phases associated with the well workover, fracturing, subsequent clean up and demobilisation prior to production were considered with emphasis on releases from temporary operations equipment, largely stationary diesel engines, and fugitive emissions from the natural gas transmission system. The greenhouse gas inventory for the operation was also assessed. Process contributions from engine releases to ground level concentrations of nitrogen dioxide and PM10 are expected to exceed short term air quality standards at the site boundary based on model predictions, although the extent of any exceedence is not clear due to the influence of temporary structures on the dispersion of low level engine exhaust releases. At the nearest locations of permanent human habitation process contributions to ground level concentrations of carbon monoxide, sulphur dioxide, volatile organic compounds and PM10 are not considered to be likely to have any significant impact on air quality. Process contributions of nitrogen dioxide are more significant, although it is concluded that these are unlikely to pose a substantial threat to the continued attainment of air quality standards. At the closest statutory designated nature conservation sites process contributions to ground level concentrations of sulphur dioxide and nitrogen dioxide are mostly below the level of significance and do not pose any substantial risk to attainment of the critical levels. Nutrient nitrogen and acid deposition associated with the process contributions at these locations are not considered to be significant in relation to corresponding critical loads. Natural gas produced from the KMA wellsite is transported via pipeline to the nearby Knapton Generating Station. Fugitive releases of natural gas are expected from the on site gas transmission system. Based on leakage rates assessed by Third Energy the impact on local air quality of fugitive natural gas releases was assessed. The maximum process contribution to ground level concentrations of methane, ethane , propane and higher hydrocarbons (expressed as benzene) was predicted to be equivalent to no more than 8% of the estimated long term environmental benchmark at the site boundary falling to below 1% of these levels at the nearest residential locations. The long term process contribution to ground level concentrations of these compounds during both pre production and production phases of well operations is not considered to be significant based on Environment Agency assessment criteria. The modelling assessment methodology and necessary assumptions provide a very conservative assessment of impact on air quality, particularly for nitrogen dioxide. The overall results and conclusions reached therefore incorporate a reasonable margin of comfort in spite of the inevitable uncertainty of such modelling studies. It is concluded that the well operations will not affect the attainment of air quality standards around the areas of permanent human habitation closest to the wellsite and will have negligible impact at local statutory designated conservation sites. Exceedences in short term air quality standards for some pollutants are likely on occasions around the site boundary. No exceedence in air quality standards is indicated for the locations of temporary habitation in the Caravan Park and nearby Flamingo Land Theme Park. Release of greenhouse gases during well operations are estimated to be around 1680 t CO2 equivalent, based on the expected duration of the defined operational phases. Due to the inherent uncertainty of this type of project the duration of some phases may exceed initial expectations and as such an estimate of 2602 tCO2 equivalent is provided as a maximum for the overall project.

  • Report No.150332 Page 5 of 41

    Revision 10

    Third Energy UK Gas Limited Kirby Misperton

    1 INTRODUCTION

    Third Energy UK Gas Limited (Third Energy) placed a contract with Environmental Scientifics Group Limited (ESG) to undertake an assessment of the impact on local air quality of discharges of important pollutants from proposed operations at the Kirby Misperton A (KMA) wellsite, North Yorkshire.

    1.1 Scope of study The purpose of this study is to assess the impact of releases from the proposed operations at the KMA wellsite on local air quality in the context of applicable air quality standards and accepted environmental benchmarks. It is necessary, as part of the application for a permit to operate, to demonstrate that the proposed development will not have a significant adverse impact on the ambient concentrations of important pollutants. The main issues to be addressed within this assessment are:

    The impact on local air quality of releases of pollutants, both point source and fugitive, on local air quality

    The estimated release of greenhouse gases during the period of operation

    1.2 General approach The approach taken in this assessment comprised the following main stages:

    Determine a suitable modelling tool for the assessment.

    Collate available process design data for input to the model.

    Determine pertinent point source release conditions over various phases

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