Mendip District Council -

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2009 Air Quality Updating and Screening Assessment for Council

In fulfillment of Part IV of the Environment Act 1995 Local Air Quality Management

April 2009

Updating and Screening Assessment April 2009 Mendip District Council - England

Local Rupert Williamson Authority Environmental Protection Officer Officer

Department Neighbourhood Services Address Cannards Grave Road BA4 5AA Telephone 01749 341466 e-mail [email protected]

Report Reference number Date

ii Updating and Screening Assessment April 2009 Mendip District Council - England

Executive Summary

Part IV of the Environment Act 1995 places responsibility on local authorities to review and assess the air quality in their area in comparison to National Air Quality Objectives. The review and assessment of air quality takes the form of an Updating and Screening Assessment (USA) every three years, which is intended to identify significant changes that may have occurred since the previous rounds of Review and Assessment. This includes new monitoring data; new or changed emission sources and any local changes that may affect air quality. Progress Reports are produced in the interim years between USAs to keep stakeholders informed of changes and allow the local authority to take early steps to protect air quality if there are doubts about achieving any objective.

If either the USA or Progress Report raises doubts as to whether an air quality objective will be achieved, then a Detailed Assessment is conducted to evaluate the risk that the objective will not be achieved. If the Detailed Assessment concludes that a risk exists, then consideration must be given to declaring an Air Quality Management Area and an Air Quality Action Plan should be introduced. The Air Quality Action Plan will include appropriate measures required to meet the objective.

This report details changes that have occurred within the district of Mendip which may have an impact upon local air quality since the Progress Report in April 2008.

Monitoring data for nitrogen dioxide measured by permanent diffusion tube gauges is presented from twelve kerbside sites across Mendip. These data indicate that the objective value for nitrogen dioxide is being achieved at all monitored locations within Mendip. Another three locations have been added to this network and results will be presented in the next report.

Whilst monitoring data has shown that there are currently no breaches of statutory limits, modelling and assessment has highlighted three areas where there are potential concerns over air quality and it will be necessary to proceed to a Detailed Assessment at these locations to decide whether Air Quality Management Areas will be required.

Mendip District Council’s next air quality report will be a Progress Report in April 2010 along with Detailed Assessments of The Butts in ; Frome Market Place; and the Charterhouse biomass boiler located near to the village of within .

April 2009 Updating and Screening Assessment iii Mendip District Council - England

Table of contents

1 Introduction 4 1.1 Description of Local Authority Area 4 1.2 Purpose of Report 4 1.3 Air Quality Objectives 5 1.4 Summary of Previous Review and Assessments 5 2 New Monitoring Data 7 2.1 Summary of Monitoring Undertaken 7 2.2 Comparison of Monitoring Results with AQ Objectives 9 3 Road Traffic Sources 13 3.1 Narrow Congested Streets with Residential Properties Close to the Kerb 13 3.2 Busy Streets Where People May Spend 1-hour or More Close to Traffic 14 3.3 Roads with a High Flow of Buses and/or HGVs. 14 3.4 Junctions 14 3.5 New Roads Constructed or Proposed Since the Last Round of Review and Assessment 15 3.6 Roads with Significantly Changed Traffic Flows 15 3.7 Bus and Coach Stations 17 4 Other Transport Sources 18 4.1 Airports 18 4.2 Railways (Diesel and Steam Trains) 18 4.3 Ports (Shipping) 19 5 Industrial Sources 20 5.1 Industrial Installations 20 5.2 Major Fuel (Petrol) Storage Depots 21 5.3 Petrol Stations 21 5.4 Poultry Farms 22 6 Commercial and Domestic Sources 24 6.1 Biomass Combustion – Individual Installations 24 6.2 Biomass Combustion – Combined Impacts 25 6.3 Domestic Solid-Fuel Burning 25 7 Fugitive or Uncontrolled Sources 26 8 Conclusions and Proposed Actions 27 8.1 Conclusions from New Monitoring Data 27 8.2 Conclusions from Assessment of Sources 27 8.3 Proposed Actions 28 9 Appendices 1

April 2009 Updating and Screening Assessment Mendip District Council - England

9.1 Appendix A: QA:QC Data 2 9.2 Appendix B: DMRB Calculations 3

9.3 Appendix C: Monthly Mean NO2 Data 10

9.4 Appendix D: Estimated PM10 from biomass combustion (combined impacts) 10

9.5 Appendix E: Comparison of NO2 Monitoring results from longer-term sites 14 9.6 Appendix F: Permitted Activities in Mendip 16

April 2009 Updating and Screening Assessment 3 Mendip District Council - England

1 Introduction

1.1 Description of Local Authority Area

Mendip District, shown in Figure 1-1, is a predominantly rural authority covering over 740 square kilometres of northeast Somerset.

BRISTOL •

SOMERSET

Figure 1-1- The District of Mendip

The population of Mendip is 109,100 (estimate for mid 2007), with the majority (approximately 60%) residing in the city of Wells, the towns of Frome, , and Shepton Mallet, and the village of Street, with the remaining in rural communities. Frome is the fourth largest town in Somerset.

The principle roads within the District are the A39, A37, A361 and A371, which are the responsibility of Somerset Council with the exception of a short stretch of the A361, which is the responsibility of the Highways Agency. Rail links are confined to a small length of the main line to in the east of the District. Given the lack of public transport and the rural nature of the district, most homes have multiple cars.

Agriculture underpins the district economy, but the quarrying industry and associated cement works dominate commercial activity. The majority of quarries are located in the eastern fringe of the . The east Mendip Hills area is one of the primary producers of limestone aggregate within the . The principal towns also provide a wide variety of industries, including a foundry, printing works, and food and drink manufacturing.

Of the 6 district and borough councils which make up the administrative county of Somerset, AQMAs have only been declared for nitrogen dioxide by South Somerset and Taunton Deane. District used to have an AQMA due to sulphur dioxide due to a cellophane installation which has now closed.

1.2 Purpose of Report

This report fulfils the requirements of the Local Air Quality Management process as set out in Part IV of the Environment Act (1995), the Air Quality Strategy for England, Scotland, Wales and Northern Ireland 2007 and the relevant Policy and Technical Guidance documents. The LAQM process places an obligation on all local authorities to regularly review and assess air quality in their areas, and to determine whether or not the air quality objectives are likely to be achieved. Where exceedances are considered likely, the local authority must then declare an Air Quality Management Area (AQMA) and prepare an Air Quality Action Plan (AQAP) setting out the measures it intends to put in place in pursuit of the objectives.

April 2009 Updating and Screening Assessment Mendip District Council - England

1.3 Air Quality Objectives

The air quality objectives applicable to LAQM in England are set out in the Air Quality (England) Regulations 2000 (SI 928), The Air Quality (England) (Amendment) Regulations 2002 (SI 3043), and are shown in Table 1.1. This table shows the objectives in units of microgrammes per cubic metre μg/m3 (milligrammes per cubic metre, mg/m3 for carbon monoxide) with the number of exceedances in each year that are permitted (where applicable).

Table 1-1 - Air Quality Objectives included in Regulations for the purpose of Local Air Quality Management in England.

Pollutant Air Quality Objective Date to be Concentration Measured as achieved by Benzene 16.25 µg/m3 Running annual mean 31.12.2003 5.00 µg/m3 Running annual mean 31.12.2010 1,3-Butadiene 2.25 µg/m3 Running annual mean 31.12.2003 Carbon monoxide 10.0 mg/m3 Running 8-hour mean 31.12.2003 Lead 0.5 µg/m3 Annual mean 31.12.2004 0.25 µg/m3 Annual mean 31.12.2008 Nitrogen dioxide 200 µg/m3 not to be 1-hour mean 31.12.2005 exceeded more than 18 times a year 40 µg/m3 Annual mean 31.12.2005 3 Particles (PM10) 50 µg/m , not to be 24-hour mean 31.12.2004 (gravimetric) exceeded more than 35 times a year Annual mean 31.12.2004 40 µg/m3 Sulphur dioxide 350 µg/m3, not to be 1-hour mean 31.12.2004 exceeded more than 24 times a year 125 µg/m3, not to be 24-hour mean 31.12.2004 exceeded more than 3 times a year 266 µg/m3, not to be exceeded more than 35 15-minute mean 31.12.2005 times a year

1.4 Summary of Previous Review and Assessments

Mendip District Council completed the first round of review and assessment between 1998 and 2000. The outcome was published in a Stage 3 report completed in January 2002 and concluded that it was not necessary to designate an AQMA in the Mendip area.

The second round of review and assessment commenced in February 2003 and was carried out in accordance with guidance LAQM:TG(03). This format followed an investigation on a

April 2009 Updating and Screening Assessment 5 Mendip District Council - England pollutant-by-pollutant basis. The 2004 Updating Screening Assessment (USA) found that there was no need to proceed to a Detailed Assessment for six of the seven pollutants under scrutiny of the LAQM, but that there was a risk of exceeding the 2010 annual mean target for PM10 in Frome town-centre. Rather than progressing to a Detailed Assessment it was decided to carry out a more comprehensive assessment in following reports.

Permanent diffusion tube sites for NO2 were set up in Frome, Street and Walton. NO2, Particles (PM10) Carbon monoxide (CO) and Ozone (O3) - measured by real-time continuous monitors housed within a Mobile Air Quality Monitoring Unit used for short-term monitoring surveys. The 2005 Progress Report did not identify any sources that required further assessment and therefore, there was no need for Mendip District council to proceed to a detailed assessment for any of the pollutants.

The 2006 USA considered 8 new NO2 diffusion tube monitoring sites and real-time monitoring of NO2; PM10; and CO in central Frome. The report concluded that there was no risk of exceeding statutory objectives for any of the pollutants and therefore no need to proceed to a Detailed Assessment.

The 2007 Progress Report showed the closure of the only Part A2 industry in the district. Monitoring from the 12 diffusion tubes in the district showed that that the annual mean objective for NO2 was being achieved. The report showed that there was no indication that statutory air quality objectives were affected by changes in industry, transport or policy within Somerset.

An extension to submitting the 2008 Progress Report was agreed with Defra in April 2008 because there were a number of factors leading to the view that Frome Town Centre might require a Detailed Assessment and it was considered that these factors would be better understood during the proceeding weeks. There were several new developments having been granted planning permission or under review that may have an impact on local air quality. These developments are still under consideration

The report showed that there was no indication that statutory air quality objectives were being breached. Frome Town Centre remained the focus of particular attention to encourage all practical measures to prevent exceedances of the National Air Quality Objectives.

April 2009 Updating and Screening Assessment Mendip District Council - England

2 New Monitoring Data

2.1 Summary of Monitoring Undertaken

2.1.1 Automatic Monitoring Sites

There have been no automatic monitoring sites in Mendip since 2006.

2.1.2 Non-Automatic Monitoring

Mendip District Council had twelve NO2 monitoring sites in the district up until the end of 2008. In January 2009 three new tube locations have been added (

Table 2-2), two of these are designed to monitor possible pollution from a proposed pyrolysis plant at Haybridge near the city of Wells. A further site has been added near to the Charlton Saw Mills near the of Buckland Down where there has been proposals to use the waste wood from the site to fuel a mini combined heat and power project. Data from all three new sites should be able to provide both before and after NO2 levels at these locations and may also provide an indication of wider pollution problems.

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Table 2-1 Details of Non- Automatic Monitoring Sites

Relevant Distance to Exposure? Worst- In kerb of OS Grid Pollutants (Y/N with case Site Name Site Type AQMA nearest road Ref Monitored distance (m) Location ? (N/A if not to relevant ? applicable) exposure) Roadside X NO N Y (2m) 1m Y Frome – 2 377741 Christchurch Y Street 147759 Roadside X NO2 N Y (2m) 1m Y Frome – 378114 Portway Y 147669 Roadside X NO2 N Y (2m) 1m Y 350383 Glastonbury Y 138608 Roadside X NO2 N Y (1m) 1m Y Norton St 377430 Philip Y 155860 Roadside X NO2 N Y (1m) 1m Y Shepton – 361985 Paul Street Y 143516 Roadside X NO2 N Y (5m) 5m Y 361583 West Shepton Y 143436 Roadside X NO N Y (11m) 11m Wells – 2 354466 Glastonbury Y Road 145128 Roadside X NO2 N Y (1m) 1m Y Wells – 354473 Tucker Street Y 145576 Roadside X NO2 N Y (1m) 1m Y Frome – Bath 377600 Street Y 148000 Roadside X NO2 N Y (1m) 1m Y 345900 Walton Y 136300 Urban X NO N N/A Frome – 2 Background 378800 Monmouth Y Drive 148500 Urban X NO2 N N/A background 348200 Street Y 135700

April 2009 Updating and Screening Assessment Mendip District Council - England

Table 2-2 Details of new non-automatic monitoring sites as of 2009

Relevant Distance to Exposure? Worst- In kerb of OS Grid Pollutants (Y/N with case Site Name Site Type AQMA nearest road Ref Monitored distance (m) Location ? (N/A if not to relevant ? applicable) exposure) Charlton Rural X 372324 NO2 N N N/A Y Sawmill Y 151962 Rural X 353114 NO N Y (2m) N/A Haybridge 2 Y 146154 Rural X 353360 NO N Y (10m) 1m Y Hole 2 Y 146766

Gradko Environmental supplies and analyses the tubes. They are a 20% TEA/Water preparation. Gradko. Full details of compliance with QA/AC schemes are given in 9.1 Appendix A

There have been no co-location studies in the past year.

A bias adjustment factor of 0.92 has been applied to the annual means of the diffusion tubes.

2.2 Comparison of Monitoring Results with AQ Objectives

Monitoring has been restricted to NO2 diffusion tubes at twelve sites across the district as previous screening and assessment has shown that monitoring for other pollutants is not required.

Monitoring results show that there has been no exceedance of any air quality limits.

2.2.1 Nitrogen Dioxide

None of the measured annual mean concentration at any of the sites has been greater than 40μg m-3. If the annual mean does not exceed 60μg m-3, then there should be fewer than 18 hours above 200μg m-3.

Modelling of NO2 for the Garsdale/Saxonvale development in Frome carried out as part of the environmental impact assessment has indicated that the limit for NO2 may be breached at Portway in Frome. The proposed development has therefore been rejected until it can be shown that it will not have an adverse effect on air quality and lead to the declaration of an AQMA.

Automatic Monitoring Data

There has been no automatic monitoring in Mendip since 2006. There are no recorded -3 -3 annual means above 60μg m for NO2. If the annual mean does not exceed 60μg m , then there should be fewer than 18 hours above 200μg m-3.

April 2009 Updating and Screening Assessment 9 Mendip District Council - England

Diffusion Tube Monitoring Data

Diffusion tube monitoring data is contained in Table 2-3 below. 8 of the 12 sites have only been in existence for 3 years. A comparison of data from all sites over the last three years is shown in Figure 2-1 below. Comparisons of data and investigations of trends and the four longer-term sites are shown in Appendix E. With the exception of Walton the trend for these four sites is that of reducing concentrations of NO2. The results for Walton however are based on a new tube location for year’s 2007 and 2008 which may explain the sharp rise in concentrations at this site.

Table 2-3 Results of Nitrogen Dioxide Diffusion Tubes 1

Data Annual mean concentrations Within Capture 3 Site ID Location 2 2008 (μg/m ) AQMA? 2008 Adjusted for bias 3 % Frome –Christchurch 1 N 92 27.09 Street 2 Frome – Portway N 75 32.76 3 Glastonbury N 100 28.5 4 N 83 18.94 5 Shepton – Paul Street N 100 34.78 6 West Shepton N 100 25.41 Wells – Glastonbury 7 N 100 19.54 Road 8 Wells – Tucker Street N 92 31.29 9 Frome – Bath Street N 92 38.12 10 Walton N 83 31.83 Frome – Monmouth 11 N 100 16.01 Drive 12 Street N 67 11.47

1 Monthly mean data for the NO2 tube locations is presented in Table 9-7 in Appendix C: Monthly Mean NO2 Data 2 Capture rates less than 90% have been highlighted in red 3 Bias Adjustment factor of 0.92 taken from the Review and Assessment website http://www.uwe.ac.uk/aqm/review/R&Asupport/diffusiontube310309.xls

April 2009 Updating and Screening Assessment Mendip District Council - England

Table 2.4b Results of Nitrogen Dioxide Diffusion Tubes

Annual mean concentrations Within (μg/m3) Site ID Location AQMA? Adjusted for bias 2006 2007 2008 Frome – Christchurch 1 N 24.1 26.33 27.09 Street 2 Frome – Portway N 32.93 37.92 32.76 3 Glastonbury N 27.02 32.98 28.5 4 Norton St Philip N 18.13 18.54 18.94 5 Shepton – Paul Street N 31.02 34.62 34.78 6 West Shepton N 27.21 24.36 25.41 Wells – Glastonbury 7 N 18.98 19.07 19.54 Road 8 Wells – Tucker Street N 31.59 33.67 31.29 9 Frome – Bath Street N 34.27* 35.83** 38.12 10 Walton N 20.2* 33.82** 31.83 Frome – Monmouth * ** 11 N 14.82 15.18 16.01 Drive 12 Street N 9.63* 11** 11.47

Figure 2-1 Comparison of NO2 monitoring

2006 to 2008 Comparison

45 Annual mean limit 40 35 30 2006 -3 25 2007 20 ug m ug 15 2008 10 5 0 Street Street Wells - Wells Tucker Walton Philip Frome - Frome Portway Wells - Wells Frome – Frome Norton St Norton Frome – Frome Frome - Frome Shepton Monmouth Shepton Bath Street Bath Glastonbury Glastonbury Mallet - Paul - Mallet Christchurch Mallet - West - Mallet Location

2.2.2 PM10

Levels of PM10 were measured using a Tapered Element Oscillating Microbalance (TEOM) at Scott Road in Frome in 2005/6. This area was considered to be the area at greatest risk of exceedance as highlighted in the 2004 USA. The monitoring reported two minor breaches of the 50μg m-3 limit. The annual mean was estimated at 18.42μg m-3. Previous DMRB assessments have shown that there was no likelihood of exceeding PM10 limits for either the annual or 24 hour mean.

There has been no further monitoring of PM10 in Mendip since this time.

* Result is from tubes supplied and analysed by Harwell laboratories with 50% TEA/Water preparation ** Jan-Mar result is from tubes supplied and analysed by Harwell laboratories with 50% TEA/Water preparation; Apr-Dec result is from tubes supplied and analysed by Gradko International with 20% TEA/Water preparation

April 2009 Updating and Screening Assessment 11 Mendip District Council - England

2.2.3 Sulphur Dioxide

There are no new significant sources of SO2 within Mendip.

Previous rounds of screening and assessment have investigated the Wessex Incinerator near Frome which is a part A1 Permitted installation and a number of asphalt plants located in Moons Hill Quarry; Merehead Quarry; Quarry; and . Since the previous USA one asphalt plant in Merehead Quarry has been shut down and one of the asphalt plants at Whatley Quarry has been replaced.

An environmental impact assessment was received for the WP2 pyrolysis plant and discussed in previous Progress Reports and USAs. Maximum predicted concentrations over different averaging periods are shown in Table 2-4 below. There does not appear to be any 2 likelihood of SO2 concentrations exceeding limits as a result of the WP plant.

2 Table 2-4 – Maximum predicted SO2 concentrations as a result of WP pyrolysis plant Haybridge near Wells

Predicted Averaging concentration Limit/Target period μg m-3 μg m-3 15-minute (99.9th percentile) 14.29 266 1 hour (99.73rd percentile) 7.771 350 24 hour (99.18th percentile) 6.47 125 Annual 6.43 50

There has been no monitoring of SO2.

2.2.4 Benzene

There has been no measurement of benzene within the district. Previous review and assessment has shown that limits are unlikely to be breached.

2.2.5 Other pollutants monitored

No other pollutants have been modelled.

Mendip District Council has examined the results from monitoring in the district. Concentrations are all below the objectives, therefore there is no need to proceed to a Detailed Assessment.

April 2009 Updating and Screening Assessment Mendip District Council - England

3 Road Traffic Sources

3.1 Narrow Congested Streets with Residential Properties Close to the Kerb

Table 3-1 below shows the narrow and congested street considered in this Updating and Screening Assessment. Using the criteria in LAQM:TG(09) it would appear that High Street, Street and The Butts in Frome required further investigation. Although the High Street, Street is congested, it does not have residential properties within 2m of the kerbside and so is not considered further here. The Butts in Frome however does meet all the criteria to make it necessary to proceed to a Detailed Assessment.

Table 3-1 Narrow and congested streets in Mendip Street Grid Grid Previously AADT NO2 Ref X Ref Y Assessed? Monitoring in Place? Bere Lane, 350258 138545 Glastonbury No 9642 Yes High Street, 350184 139001 Glastonbury Yes 4770 No Benedict Street, 349802 138872 Glastonbury No 2373 No High Street, Street 348586 136971 No 6948 No Orchard Road, 347996 136765 Street No 767 No The Butts, Frome 377276 147365 No 10220 No Christchurch 377882 147763 Street East, Frome Yes No data Yes Portway, Frome 378059 147705 Yes No data Yes Bath Street, 377640 147996 Frome Yes No data Yes Cork Street, 377620 148048 Frome Yes No data No Stony Street, 377608 148019 Frome Yes No data No Market Place, 377635 148038 Frome Yes No data No Christchurch 377380 147895 Street West, Frome Yes 14580 No Chilkwell Street, 350508 138542 Glastonbury Yes 9157 No Paul Street, 361965 143523 Shepton Mallet Yes No data Yes West Shepton, 361477 143416 Shepton Mallet Yes No data Yes Tucker Street, 354466 145561 Wells Yes No data Yes Sadler Street, 354946 145829 Wells Yes No data No

April 2009 Updating and Screening Assessment 13 Mendip District Council - England

Mendip District Council has identified congested streets with a flow above 5,000 vehicles per day and residential properties close to the kerb, not adequately considered in previous rounds of Review and Assessment, and will need to proceed to a Detailed Assessment.

3.2 Busy Streets Where People May Spend 1-hour or More Close to Traffic

Busy streets where the public may spend one hour or more within 5m of the kerb with a traffic flow greater than 10,000 vehicles per day have been previously assessed. There are no further sites to be investigated.

Mendip District Council confirms that there are no new/newly identified busy streets where people may spend 1 hour or more close to traffic.

3.3 Roads with a High Flow of Buses and/or HGVs.

There is only one location in Mendip where combined flows of buses and HGVs above 3.5 tonnes are above 20%; this is on road C2533 to the west of the village of (X:372305; Y:145211). Just over 50% of the traffic at this location is HGV. The reason for this is that this is the main route from Whatley Quarry to the north to the A361. It is also sited next to Coleman’s quarry. The total flow of HDV is less than 2,500 a day.

Mendip District Council has assessed newly identified road(s) with high flows of buses or HDVs in a busy street and concluded that it will not be necessary to proceed to a Detailed Assessment.

3.4 Junctions

Newly identified busy junctions are shown in Table 3-2 below. Annual average daily traffic (AADT) data was not available for all of these junctions, and average speed was not available for any of the junctions.

The junction of Townsend/West Shepton and Old Market Road in Shepton Mallet sits on the entrance to the new Townsend shopping site that opened in October 2007 and it is expected that traffic has increased considerably as a result. A NO2 diffusion tube is located at the closest property to the junction. Monitored data shows a continued reduction of NO2 mean concentrations in the area despite probable increased traffic flows.

Bath Street/Cork Street/Stony Street and Market place have been considered individually in the past, but the junction as a whole has not been considered. Although AADT figures are not known for the individual roads, there is an annual flow of 15,200 vehicles just to the north of this junction so it seems probable that the AADT is greater than 10,000.4

4 Details of traffic data are provided in Appendix F

April 2009 Updating and Screening Assessment Mendip District Council - England

There are no figures for the junction of the A39/A371, but the A39 has an AADT of 14,950 and so it is assumed that the junction has an AADT greater than 10,000

The other junctions that were considered all have an AADT of less than 10,000 and so no further modelling was carried out for these sites in line with the technical guidance.

Table 3-2 Busy Junctions in Mendip Grid reference Previously Nearest Name Assessed? AADT receptor Magdalene/High Street/Benedict Street. 349882/138905 Glastonbury No 3994.67 6m Bere Lane/ Chilkwell Street, Glastonbury 350401/138610 No 7745.33 5m Bere Lane/Butleigh Old Road, 350131/138496 Glastonbury No 5821.33 10m Orchard Road/Vestry Road/High Street, 348172/136527 Street No 9049.5 10m Townsend/West Shepton/ Old Market 361623/143425 No Road, Shepton Mallet No details 5m Bath Street/Cork Street/Stony 377629/148033 Street/Market Place, Frome No >10,000 10m A39(Strawberry Way)/A371, Wells 354289/145787 No >10,000 9m

Of the three junctions that require modelling, both Townsend and Strawberry Way appear to be well under limits for PM10 and NO2. There is insufficient traffic data to model pollution concentrations in Bath Street, Frome. NO2 measurements close to this site indicate that concentrations of NO2 are approaching the limit value. It has therefore been decided to go to a Detailed Assessment at this site.

The modelled data has been adjusted and verified against monitored data and is included in Appendix B: DMRB Calculations.

Mendip District Council has assessed new/newly identified junctions meeting the criteria in Section A.4 of Box 5.3 in TG(09), and concluded that it will be necessary to proceed to a Detailed Assessment for NO2 and PM10 at Frome Market Place.

3.5 New Roads Constructed or Proposed Since the Last Round of Review and Assessment

There are no new roads or proposed roads since the last round of review or assessment.

Mendip District Council confirms that there are no new/proposed roads.

3.6 Roads with Significantly Changed Traffic Flows

Table 3-3 below show all the roads with flows over 10,000 and the percentage increase in traffic from 2004 to 2007. There are no instances where traffic has increased by more than 25%.

April 2009 Updating and Screening Assessment 15 Mendip District Council - England

Table 3-3 Percentage increase in traffic on busy roads Road Annual Annual Number Flows Flows Census All All % Point Map Ref Year Vehicles Year Vehicles increase Frome The B3090 Butts 377087 147170 2004 10100 2007 10220 1.19% Rode A361 Common 381729 154230 2004 11000 2007 10900 -0.91% Wells, Blue A39 School 354675 146030 2004 11650 2007 11470 -1.55% Feltham A361 Farm 378602 146354 2004 11750 2007 12250 4.26% A36 Standerwick 382408 149908 2004 11950 2007 12500 4.60% A39 Coxley 353446 144213 2004 15200 2007 12550 -17.43% Frome, A362 Wallbridge 378466 147735 2004 12600 2007 13670 8.49% A37 Downside 362439 145445 2004 13150 2007 13800 4.94% A37 Rush Hill 362640 154990 2004 13650 2007 13800 1.10% West of A39 Walton 344500 136200 2004 14400 2007 14300 -0.69% Frome, Christchurch A362 St West 377281 147959 2004 14450 2007 14580 0.90% Wells, Strawberry A39 Way 354347 145340 2004 14400 2007 14950 3.82% Frome North B3090 Parade 377896 148298 2004 14760 2007 15200 2.98% A361 Ridgeway 375293 145299 2004 14750 2007 15350 4.07% South of A36 Woolverton 379644 153059 2004 16450 2007 17100 3.95% South of A361 380465 152816 2004 17100 2007 17750 3.80% North of Cannards A37 Grave 362738 141432 2004 19950 2007 21050 5.51% North of A39 Street 348602 137403 2004 25400 2007 23300 -8.27% Beckington A36 Bypass 380527 152123 2004 28000 2007 29450 5.18%

Mendip District Council confirms that there are no new/newly identified roads with significantly changed traffic flows.

April 2009 Updating and Screening Assessment Mendip District Council - England

3.7 Bus and Coach Stations

Wells Bus Station on Princes Road is the largest bus station within the district. The previous Updating and Screening Assessment (USA 2006) stated that there is no relevant exposure within 10m of the bus station. Since the USA 2006 the layout of the bus station was altered, repositioning five bus bays. A reassessment has shown that relevant exposure is now within 10m of the bus station where buses may be present, but that there are only 518 bus movements a day which is well below 2,500 limit.

Mendip District Council confirms that there are no relevant bus stations in the Local Authority area.

April 2009 Updating and Screening Assessment 17 Mendip District Council - England

4 Other Transport Sources

4.1 Airports

There are no airports within the district of Mendip or within 1000m of the boundary. , the closest international airport is over 18km away from the district boundary

Mendip District Council confirms that there are no airports in the Local Authority area.

4.2 Railways (Diesel and Steam Trains)

Steam and diesel locomotives were considered in the 2004 USA. There have not been any major changes that would affect the conclusions of the initial assessment.

There is a short section of the southwest to London mainline running through countryside with no relevant or regular exposure.

Quarry trains jointly operated by Hanson Aggregates and Aggregate Industries operate out of Whatley Quarry and Merehead Quarry respectively. Quarry trains fall under the control of . These trains join the main passenger line to London after Frome. The junctions are in rural locations with no relevant exposure.

4.2.1 Stationary Trains

The only steam train in operation in Mendip is the . This is an approximately 3km length of track running 8 months of the year with a maximum of 8 trains a day5. Although the train can be stationary for longer than 15minutes there is no relevant regular exposure of individuals within 15 of the train.

The only passenger station in Mendip is at Frome. This has approximately 15 outgoing and 15 inbound trains a day. There are no relevant receptors within 15 m of locomotives at the station.

Quarry trains waiting at signals do so in areas with no relevant exposure within 15m.

Mendip District Council confirms that there are no locations where diesel or steam trains are regularly stationary for periods of 15 minutes or more, with potential for relevant exposure within 15m.

5 http://www.eastsomersetrailway.com/tt.php

April 2009 Updating and Screening Assessment Mendip District Council - England

4.2.2 Moving Trains

Mendip District Council does not have any sections of track that have a large number of movements of diesel locomotives as specified in the LAQM: TG(09)

Mendip District Council confirms that there are no locations with a large number of movements of diesel locomotives, and potential long-term relevant exposure within 30m.

4.3 Ports (Shipping)

There are no ports in Mendip.

Mendip District Council confirms that there are no ports or shipping that meet the specified criteria within the Local Authority area.

April 2009 Updating and Screening Assessment 19 Mendip District Council - England

5 Industrial Sources

5.1 Industrial Installations

A full list of installations covered by the Environmental Permitting Regulations (2007) is presented in 9.6 Appendix F. These represent the major industrial sources of air pollution within the district.

5.1.1 New or Proposed Installations for which an Air Quality Assessment has been Carried Out

There is only one new or proposed installation which is the WP2 pyrolysis plant proposed for Haybridge near Wells. The Air Quality Assessment for this installation has already been considered in previous assessments.

Table 5-1 Maximum Pollutant Concentrations Predicted for WP2 Pyrolysis Plant EQS (μg m- Max (μg m- Pollutant Time period 3) 3) 24 hour (90.41st percentile) 50 16.6 24 hour (98.08th percentile) 50 16.9

PM10 Annual 40 16.3 15 minute (99.9th percentile) 266 38 1 hour (99.73rd percentile) 350 27 24 hour (99.a8th percentile) 125 8.1

SO2 Annual 50 3.2 1 hour (99.79th percentile) 200 47.5

NO2 Annual 40 8.9

Mendip District Council has assessed new/proposed industrial installations, and concluded that it will not be necessary to proceed to a Detailed Assessment.

5.1.2 Existing Installations where Emissions have Increased Substantially or New Relevant Exposure has been Introduced

There are no installations where production or emissions have increased by 30% or more or where new exposure has been introduced. In the current economic climate there has been a reduction in output from many industries in the area.

Mendip District Council confirms that there are no industrial installations with substantially increased emissions or new relevant exposure in their vicinity within its area or nearby in a neighbouring authority.

April 2009 Updating and Screening Assessment Mendip District Council - England

5.1.3 New or Significantly Changed Installations with No Previous Air Quality Assessment

The only new installation for which an Air Quality Assessment has not been carried out is Cliniserve which is an autoclave for clinical waste based on the new Commerce Park development on the Frome bypass. This installation is unlikely to be a source of significant pollution.

Mendip District Council has assessed new or proposed industrial installations for which planning approval has been granted within its area or nearby in a neighbouring authority, and concluded that it will not be necessary to proceed to a Detailed Assessment.

5.2 Major Fuel (Petrol) Storage Depots

There are no major fuel (petrol) storage depots within the Local Authority area.

5.3 Petrol Stations

No monitoring for benzene has been carried out by Mendip District Council as previous review and assessment has shown that there are insufficient sources of benzene to have an impact on air quality in Mendip.

Table 5-2 consists of all petrol stations in Mendip that are currently permitted under the Environmental Permitting Regulations 2007. Since the 2006 USA three permitted petrol stations have closed and one new petrol station has opened which has Stage II vapour recovery fitted.

Distances from petrol pumps to receptors has been re-measured in all instances and only one petrol station has receptors within 10m of the petrol pumps. Previously measurements were taken from the boundary of the site.

A detailed assessment is not necessary for any of the sites.

April 2009 Updating and Screening Assessment 21 Mendip District Council - England

Table 5-2 Petrol Stations in Mendip with permits issued under the Environmental Permitting Regulations (2007)

Throughput Relevant Stage II of petrol exposure vapour Previously >2000m3 within >30,000 Petrol Stations recovery Assessed? p.a. 10m? vpd Farleigh Service Station, BA2 7TP No Yes No No No Shepton Mallet Motors, Townsend, Shepton Mallet BA4 5SB No Yes Yes No No Broadway Garage, Broadway, BA3 4JW No Yes Yes Yes No Wells Service Station, 44 Chamberlain Street, Wells BA5 2PJ Yes Yes Yes No No Bathway Service Station, Road, Beckington BA11 6SF No Yes Yes No No Charlton Garage, 72 Charlton Road, Shepton Mallet BA4 5PD No Yes No No No J Sainsbury, Wessex Fields, Marston Road, Frome BA11 4DH Yes Yes Yes No No Moff Motors, Station Road, Castle Cary BA7 7PF No Yes No No No Asda, Warminster Road, Frome BA11 5LA No Yes Yes No No J Sainsbury Plc, Gravenchon Way, Street BA16 OHS No Yes Yes No No Motorcare, Portway, Frome BA11 1QX No Yes Yes No No Wirral Park Service Station, Wirral Park, Wirral Park Road, Glastonbury BA6 9XE No Yes Yes No No Wm Morrison Supermarkets Plc, Street Road, Glastonbury BA6 9ED Yes Yes Yes No No Nunney Catch Service Station, Nunney Catch, Nunney BA11 4NZ No Yes No No No Tesco, Townsend Shopping Park, Townsend, Shepton Mallet, BA4 5SB Yes No Yes No No

Mendip District Council confirms that there are no petrol stations meeting the specified criteria.

5.4 Poultry Farms

There are currently six intensive poultry units with more than 40,000 places for poultry. All of these farms are broiler units. Only one of these farms has more than 200,000 birds but is also mechanically ventilated and so falls outside the need for a Detailed Assessment. A new farm, Pollingfold, has places for 225,000 birds, and the intention here is to have mechanical ventilation.

Details of all the farms are shown in table Error! Reference source not found. below:

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Table 5-3 – Intensive Poultry Farms in Mendip

Grid Grid Poultry Farm Birds Ref Ref Ashley Farm, , BA4 4LG 122,000 6925 4579 Barrow Hill Farm, North Wootton, BA5 1QJ 67,000 5543 4227 Beardshill Farm, Pilton, BA4 4EH 204,000 6249 4065 Doublegate Farm, Little Acre, , BA5 1RZ 73,000 4778 4285 Greenacre Farm, Doctors Hill, Wookey, BA5 1AR 92,000 5180 4624 Pollingfold, Bunns Lane, West Woodlands BA11 225,000 7700 4400 Steanbow Farm, Pilton, BA4 4EH 102,000 5774 4015

Mendip District Council confirms that there are no poultry farms meeting the specified criteria.

April 2009 Updating and Screening Assessment 23 Mendip District Council - England

6 Commercial and Domestic Sources

6.1 Biomass Combustion – Individual Installations

Charterhouse Centre

There is currently one wood combustion plant based at the Charterhouse Centre, Charterhouse-on-Mendip, Blagdon BS40 7XR. This is a 55kW boiler. Despite three requests for details of the boiler no information has been supplied. In the absence of emission rates these have been estimated from the maximum thermal capacity of the boiler6. Therefore it is -1 -1 assumed that the emission factor is 240g PM10 GJ and 150g NO2 GJ . Therefore emission -6 -1 -3 -1 rates would be 240 x 55 x 10 = 0.0132g s PM10 and 8.25x10 g s NO2.

There is no stack height data for this boiler and so it is assumed to be a ground level source, therefore Figure 5.6 and 5.3 of LAQM.TG(09) is used.

The annual emission rate for PM10 is 0.0132 x 60 x 60 x 24 x 365 = 416275.2g = 0.41 tonne p.a. This suggests that there should not be a receptor location within 400m, however the Charterhouse Centre is an outdoor pursuits and with accommodation it is felt that detailed assessment will be necessary, although the necessity for this may change should details of the stack and actual emission rates prove otherwise.

-3 The annual emission rate for NO2 is 8.25x10 x 60 x 60 x 24 x 365 = 260172g p.a. = 0.26 tonne p.a. This suggests that there should not be a receptor within 25m of the boiler. It will therefore be necessary to carry out a Detailed Assessment for NO2 for the boiler at this location.

Mells Park Estate

One new biomass boiler has been proposed. This is at Mells Park Estate, Frome, BA11 3QB. This 200kW boiler has a 7m stack with 200mm diameter. It has not been possible to obtain emission data for this boiler.

This has a stack height of 7m (3.5m above the building in which it sits), but there are buildings within 5 times the height of the stack (35m) that are also 7m high. The effective stack height is therefore calculated as per box 5.6 of LAQM.TG(09).

Ueff = 1.66(Uact - H)

Ueff = 1.66 x (7 – 7)

Ueff = 0 = ground level source

The annual emission rate for PM10 is 0.048 x 60 x 60 x 24 x 365 = 1513728g = 1.51 tonne p.a. This suggests that there should not be a receptor location within 650m. The nearest receptor is within 470m.

The annual emission rate for NO2 is 0.03 x 60 x 60 x 24 x 365 = 946080g p.a. = 0.95 tonne p.a. This suggests that there should not be a receptor within 300m of the boiler. There are no receptors within 300m.

6 Abbott, J ‘Technical Guidance: screening assessment for biomass boilers’. AEA Report ref AEA/ED48673005/R2544-Issue1.

April 2009 Updating and Screening Assessment Mendip District Council - England

In order that a Detailed Assessment is not necessary for the Mells site a larger stack will be required for the boiler.

Mendip District Council has assessed biomass combustion plant, and concluded that it will be necessary to proceed to a Detailed Assessment for PM10 and NO2

6.2 Biomass Combustion – Combined Impacts

Each of the large settlements was split into 500x500m areas and assessed for the combined effects of domestic and commercial heating. Each parish was also considered.

No figures are held by the Council on the proportion of solid fuel appliances domestically or commercially if under 50kW.

In the absence of data a national figure for domestic heating was used7. 8% of properties have no central heating and so the worst case scenario of an open fireplace burning wood was assumed. 1% of properties have solid fuel central heating, again, the worst case scenario of a coal fired boiler was assumed. Commercial solid fuel use was assumed to be the same as domestic.

The background figure for PM10 was found for each 500x500m square and for the largest settlement within each parish. The estimated PM10 from solid fuel combustion is normally corrected for the area it actually covers in a 500x500m area; however this proved to be unnecessary as even without this adjustment a comparison with the background PM10 level showed that there was no need for a detailed assessment in any area.

Details of background PM10 and estimated PM10 for the areas studied are in Appendix D.

Mendip District Council has assessed the biomass combustion plant, and concluded that it will not be necessary to proceed to a Detailed Assessment.

6.3 Domestic Solid-Fuel Burning

Using an estimate of 1% of houses having coal fired central heating as per section 6.2 above there do not appear to be any areas where more than 50 domestic properties may be using coal as the main fuel for central heating. Consequently there should not be any areas of significant SO2 production from domestic sources.

Mendip District Council confirms that there are no areas of significant domestic fuel use in the Local Authority area.

7 Everett, R. and Herring, H. 2007 T206-Energy for a sustainable future: Energy savings in buildings, Open University (2007) p. 33

April 2009 Updating and Screening Assessment 25 Mendip District Council - England

7 Fugitive or Uncontrolled Sources

Andrew Hopkins Concrete Limited, a cement batching plant, is the only new installation that is likely to have significant fugitive emissions and is of interest as the site sits next to a waste transfer station operated my May Gurney. This transfer station is permitted by the Environment Agency. The site is 400m from the nearest receptor. The background PM10 level is only 14.95 μg m-3 so there is no need to proceed to a Detailed Assessment.

Mendip District Council confirms that there are no potential sources of fugitive particulate matter emissions in the Local Authority area.

April 2009 Updating and Screening Assessment Mendip District Council - England

8 Conclusions and Proposed Actions

8.1 Conclusions from New Monitoring Data

Monitoring data is currently only available for NO2. Results are from 12 diffusion tubes across the District. All results are currently below the 40μg m-3. There does not to appear to be a district-wide trend in results, although there have been rises in NO2 levels at two-thirds of locations over the last year.

8.2 Conclusions from Assessment of Sources

The Butts in Frome is a narrow road with relatively heavy traffic. Further investigation is necessary here. This appears to be the only narrow street which has not been investigated previously and has residential properties within 2m of the kerb and daily vehicle flow rate of 5000.

There are no busy streets where people spend more than one hour a day that have not been previously assessed. This is unlikely to change in the near future.

Currently there is only one road with high levels of HGV traffic but this has no relevant receptors. The high level of quarrying activity within the district and prohibition of quarry traffic on specific roads in other may lead to increases in HGV traffic

Assessment of junctions has been carried out and modelling has been verified against diffusion tube monitoring elsewhere in the district. Diffusion tube monitoring close to the market place junction suggests that levels of NO2 are approaching limits. Levels at the junction itself will need to be modelled but there is insufficient traffic data to do this.

There are no new roads within the district and no roads with significant increases in traffic. There are no new bus or coach stations within the district.

Rail transport will need to be assessed again in the future as freight from the quarries is not constant and there may be potential increases in the future. This may result in trains waiting in areas where there are relevant receptors. Currently this is not the case.

Currently there is only one biomass unit in operation above 50kW. This is the Charterhouse Centre boiler which runs on wood pellets. There is currently insufficient information to assess the unit for potential PM10 and NO2 national objective breaches. A proposed boiler at Mells Park does not currently have a sufficient stack height to ensure adequate dispersion.

Potential pollution from domestic and commercial biomass units has been assessed and it is not felt that there are any areas that would require further investigation.

There is one new part-B cement process within the district, while another part-B cement process has closed. Assessed fugitive conditions do not require further investigation.

All other assessed sources suggest that there is no risk of breaching air quality standards.

April 2009 Updating and Screening Assessment 27 Mendip District Council - England

8.3 Proposed Actions

The Butts in Frome will need to go to Detailed Assessment as it is a narrow street with residential properties within 2m of the kerb and over 5,000 vehicles per day. It is intended to monitor NO2 with diffusion tubes at the most vulnerable location. The site is considered to be particularly important with regards to redevelopment of the Singers Knoll; Saxonvale and Garsdale areas, which may have an impact on traffic through this location.

The Market Place junction in Frome requires traffic data so that full DMRB modelling can be carried out. Should this show that levels of NO2 are approaching limits then diffusion tube monitoring will also be carried out at the actual junction itself. Currently there is monitoring close to the site, but in an area that is more likely to affected by a street canyon effect.

Further information is needed on the Charterhouse biomass boiler. This will form the initial phase of a detailed assessment and this will be progressed unless the findings show that this boiler should not be considered a concern in terms of air quality.

Detailed Assessments are not required in any other areas within Mendip. A proactive approach in terms of planning within the district and continued work with the Somerset Air Quality Strategy Group which is made up of all the local authorities within Somerset is being followed.

The Somerset Air Quality Strategy that was adopted by Mendip in 2009 looks at transport; planning; climate change; industry and at identifying other key stakeholders in terms of maintaining and improving air quality within Mendip.

April 2009 Updating and Screening Assessment Mendip District Council - England

Figure 8-1 – Detailed Assessment Locations in Frome

Figure 8-2 – Location of Biomass Boiler at Charterhouse

,5- 1': * ·i: % :,; ge,,,

i ~-"':

April 2009 Updating and Screening Assessment 29

Mendip District Council - England

9 Appendices

Appendix A: QA/QC Data

Appendix B: DMRB Calculations

Appendix C: NO2 tube monthly mean

Appendix D: Estimated PM10 from biomass combustion (combined impacts)

Appendix E: Comparison of NO2 Monitoring results from longer-term sites

Appendix F: Appendix F: Permitted Activities in Mendip

April 2009 Updating and Screening Assessment Mendip District Council- England

9.1 Appendix A: QA:QC Data

Diffusion Tube Bias Adjustment Factors

Bias Adjustment factor of 0.92 taken from the Review and Assessment website http://www.uwe.ac.uk/aqm/review/R&Asupport/diffusiontube310309.xls

Factor from Local Co-location Studies (if available)

There have been no co-location studies

Discussion of Choice of Factor to Use

No local bias-adjustment factors were available, so the national adjustment factor of 0.92 was used.

PM Monitoring Adjustment

There has been no PM monitoring carried out

Short-term to Long-term Data adjustment

QA/QC of automatic monitoring

There has been no automatic monitoring.

QA/QC of diffusion tube monitoring

WASP results for 01.08 to 01.09 were as follows :

Jan08 Round 100 : Ref Value : 1.36ugNO2 Measured Value : 1.34 ugNO2 Z score -0.1 Satisfactory 1.47ugNO2 Measured Value : 1.50 ugNO2 Z score 0.2 Satisfactory

March08 Round 101 Ref Value : 0.92ug NO2 Measured Value :0.95ugNO2 Z Score 0.2 Satisfactory Ref Value : 1.86ugNO2 Measured Value : 1.85ugNO2 Z Score 0 Satisfactory

July 08 Round 102 Ref Value : 1.37ugNO2 Measured Value : 1.42ugNO2 Z Score 0.3 Satisfactory Ref value : 2.28ugNO2 Measured Value : 2.21ugNO2 Z score -0.2 Satisfactory

Jan09 Round 104 Ref Value : 2.02ugNO2 Measured Value :1.85ugNO2 Z Score -0.7 Satisfactory Ref Value : 1.22ug NO2 Measured Value : 1.21ugNO2 Z Score - 0.1 Satisfactory

Gradko confirm that they also employ the AEA Technology and Environment NO2 QC solution to check the validity of their calibration curves derived from internal standards prepared from NIST certified nitrite standards.

Gradko’s general statement on Defra Guidance Document that has been supplied to Local Authorities is as follows :

'Our NO2 diffusion tube procedures have been amended to follow the guidelines of the DEFRA Harmonisation document related to the preparation, extraction, analysis and calculation procedures for NO2 passive diffusion tubes. These amendments are minimal because we already carried the out most of the procedures before the introduction of the Guidelines. Our internal analysis procedures are assessed by U.K.A.S. on an annual basis for compliance to ISO17025

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9.2 Appendix B: DMRB Calculations

Table 9-1 – Input Data: Background Concentrations Background Concentrations

Location/ Grid Ref Location Receptor Year NOx NO2 PM10

Strawberry A 2008 354289/145787 Way 15.23438 12.346955 16.587485

B Townsend 2008 11.896805 15.874132 361623/143425 14.598215

C Frome Market 2008 15.508095 12.65705 16.680291 377629/148033 Chilkwell D 2008 11.44 9.542 15.145 350383/138608 Roundabout

E Walton 2008 11.083 9.25 14.928 345900/136300

Table 9-2 – Input data: Traffic Information

Distance from Traffic flow & speed Traffic composition link Location/ Link Annual Total Total % centre AADT Road Receptor number average % LDV HDV to (combined, type speed (<3.5t (>3.5t receptor veh/day) (A,B,C,D) (m) (km/h) GVW) GVW) 1 19 14940 40 A 94.71 5.29

A 2 19 14940 40 A 94.71 5.29

3 19 11470 40 A 94.71 5.29

1 5 3700 40 B 98.92 1.08

B 2 5 6143 40 A 94.71 5.29

3 5 6143 40 A 94.71 5.29

1 10 32 B

2 10 32 B C 3 10 32 D

4 10 32 D

1 11 9157 24 A 95.56 4.44

D 2 11 9642 24 A 95.66 4.34

3 11 4437 24 B 99.3 0.7

E 1 5 14300 48 A 84.06 15.94

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Table 9-3 – Unadjusted DMRB modelling

NOx NO2 * PM10

Receptor Annual Annual Annual Name Year Days number mean μg mean μg mean μg >50μg m-3 m-3 m-3 m-3

Strawberry 1 2008 62.90 24.1 22.21 6.66 Way West 2 2008 37.85 18.44 18.68 1.98 Shepton Frome 3 Market 2008 Unavailable Unavailable Unavailable Unavailable Place Chilkwell 4 2008 43.57 18.27 16.59 2.92 Street 5 Walton 2008 58.60 21.20 19.52 2.84

Verification

Table 9-4: Modelled vs Monitored Data

Difference Monitor Site Background Monitored Modelled [(modelled - Site ID Site name Type Type NO2 total NO2 total NO2 monitored) / monitored]x100

Strawberry A None R 12.346955 Unavailable 24.75 N/A Way B Townsend DT R 11.896805 25.41 18.44 -27.43616389 C Frome Market DT R 12.65705 38.12 Unavailable N/A D Glastonbury DT R 9.542 28.5 18.27 -35.89473684 E Walton DT R 9.25 31.83 21.20 -33.39812216

There is no monitored data for the Strawberry Way location and it has not been possible to model the Frome Market area due to insufficient traffic data. DMRB modelling has also been carried out for Glastonbury and Walton for verification purposes.

The modelled data is under-predicting NO2 by more than 25% at all sites

Table 9-5 – Monitored NOx levels

Modelled Monitored Monitored road road road Site Monitored Monitored Background Background contribution Site name contribution contribution ID total NO2 total NOx NO2 NOx NOx NO2 (total - NOx (total - (excludes background) background) background) Strawberry A Unavailable Unavailable 12.346955 15.23438 N/A N/A 47.67 Way B Townsend 25.41 54.6 11.896805 14.598215 13.063045 40.001785 23.25 Frome C 38.12 102.7 12.65705 15.508095 26.223195 87.191905 N/A Market D Glastonbury 28.5 71.1 9.542 11.44 15.84295 59.66 32.13 E Walton 31.83 85 9.25 11.083 22.288 73.917 47.52

Updating and Screening Assessment April 2009 Mendip District Council - England

Figure 9-1 Road Contribution NOx

Road Contribution NOx

90

80 y = 1.6583x 70 60 • Modelled NOx X= y 50 ■ Linear (X=y) 40 Linear (Modelled NOx) 30

Monitored NOx Monitored Linear (Modelled NOx) 20 10

0 0.00 20.00 40.00 60.00 80.00 100.00 Modelled NOx

The modelled data was adjusted in line with monitored data as in Table 9-6 below.

Table 9-6 Adjusted Modelled Data Ratio of monitored % road Difference Contribution Adjusted Modelled [(modelled NOx / Adjustment Adjusted modelled total NO2 - modelled factor for modelled total NOx (based on monitored) road modelled road (incl. empirical / Site contribution road contribution background NOx / NO2 Monitored monitored] ID Site name NOx contribution NOx NOx) relationship) total NO2 x100 Strawberry A Way Unavailable 79.0438976 94.2782776 35.9 Unavailable N/A B Townsend 1.720250008 38.5612322 53.1594472 25.5 25.41 0.3541913 Frome 1.6583 C Market Unavailable Unavailable Unavailable Unavailable 38.12 N/A D Glastonbury 1.850606909 53.281179 64.721179 26.9 28.5 -5.6140351 E Walton 1.555534905 78.8002639 89.8832639 34 31.83 6.8174678

This shows that the adjusted modelled predictions are now within 10% of the monitored data. There is no need to proceed to a Detailed Assessment for the Strawberry Way junction.

April 2009 Updating and Screening Assessment Mendip District Council- England

Figure 9-2 – Adjusted Modelled NO2 data

45

40

35

30 • Series1

■ X=Y 25 .. X=0.75Y

X X=0.9Y

20 I Y=0.9X I " I I , Linear (X=0.75Y) , , / 15 , , I Linear (X=Y) , , , , Linear (X=0.9Y) , / Linear (Y=0.9X) 10

5

0 -10 0 10 20 30 40 50 -5

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Maps of Locations

Figure 9-3 Strawberry Way / Portway Junction

Figure 9-4 West Shepton

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Figure 9-5 Frome Market Place

Figure 9-6 Chilkwell Street

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Figure 9-7 - Walton

April 2009 Updating and Screening Assessment Mendip District Council- England

9.3 Appendix C: Monthly Mean NO2 Data

Frome - Christchurch Street Frome - Portway Glastonbury Norton St. Philip Shepton - Paul Street West Shepton Wells - Glastonbury Road Wells Tucker Street Frome -Bath Street Walton Frome - Monmouth Drive Street Jan 25.01 36.18 27.22 15.35 38.56 22.1 23.61 36.41 44.38 27.86 15.47 13.72 Feb 43.13 31.44 41.06 32.62 52.08 35.54 31.05 45.1 46.73 49.38 32.23 24.5 Mar 29.78 Missing 36.35 Missing 35.02 26.93 16.38 33.63 32.16 Missing 15.89 Missing Apr 27.76 41.3 32.84 Missing 33.29 29.67 18.73 36.57 44.66 Missing 15.35 12.36 May 29 38.59 33.07 25.96 36.51 24.98 23.03 27.18 51.92 17.38 17.4 9.94 Jun 24.25 35.53 31.9 14 41.63 24.6 15.8 30.99 36.75 33 11.53 7.97 Jul 20.38 Missing 21.31 14.57 31.06 34.74 13.96 Missing 41.86 27.24 10.06 8.26 Aug Missing 29.31 9.79 12.11 31.89 18.11 14.31 20.05 40.3 21 9.7 7.19 Sep 21.99 23.45 25.91 17.45 28.62 20.55 19.52 27.79 34.35 39.25 15.45 12.92 Oct 24.33 35.97 27.91 16.84 38.12 26.47 20.13 36.95 Missing 36.08 16.94 Missing Nov 35.59 Missing 43.74 28.17 38.7 29.09 28.84 36.53 38.78 44.6 20.22 Missing Dec 42.62 48.71 40.57 28.79 48.21 38.67 29.51 42.9 43.86 50.15 28.64 Missing

Table 9-7 Monthly Mean Data (unadjusted) for NO2 tube locations

9.4 Appendix D: Estimated PM10 from biomass combustion (combined impacts)

1% Solid 8% open Fuel Central All fire Heating Estimated Background Parish/ Town area Households (wood) (Coal) kg/year PM10 495 39.6 4.95 1200.2265 15.37 331 26.48 3.31 802.5757 14.88 Batcombe 159 12.72 1.59 385.5273 NA Beckington 400 32 4 969.88 16.26 Berkley 135 10.8 1.35 327.3345 NA 129 10.32 1.29 312.7863 NA 155 12.4 1.55 375.8285 NA Butleigh 354 28.32 3.54 858.3438 14.58 206 16.48 2.06 499.4882 15.46 Chilcompton 755 60.4 7.55 1830.6485 14.91 Coleford 927 74.16 9.27 2247.6969 15.78 Cranmore 175 14 1.75 424.3225 NA 263 21.04 2.63 637.6961 15.18 304 24.32 3.04 737.1088 14.91 232 18.56 2.32 562.5304 15.46 144 11.52 1.44 349.1568 NA

Updating and Screening Assessment April 2009 Mendip District Council - England

Elm 58 4.64 0.58 140.6326 NA 54 4.32 0.54 130.9338 NA 946 75.68 9.46 2293.7662 15.88 Frome 1 153 12.24 1.53 370.9791 16.24 2 364 29.12 3.64 882.5908 16.24 3 521 41.68 5.21 1263.2687 16.16 4 1233 98.64 12.33 2989.6551 16.16 5 946 75.68 9.46 2293.7662 15.88 6 212 16.96 2.12 514.0364 15.88 7 387 30.96 3.87 938.3589 16.45 8 453 36.24 4.53 1098.3891 16.68 9 963 77.04 9.63 2334.9861 16.68 10 574 45.92 5.74 1391.7778 16.43 11 861 68.88 8.61 2087.6667 16.43 12 1207 96.56 12.07 2926.6129 15.96 13 289 23.12 2.89 700.7383 15.96 14 1287 102.96 12.87 3120.5889 16.45 15 2323 185.84 23.23 5632.5781 16.68 16 1341 107.28 13.41 3251.5227 16.68 17 651 52.08 6.51 1578.4797 16.43 18 964 77.12 9.64 2337.4108 16.43 19 372 29.76 3.72 901.9884 15.96 20 278 22.24 2.78 674.0666 16.3 21 1348 107.84 13.48 3268.4956 16.3 22 1107 88.56 11.07 2684.1429 16.87 23 1700 136 17 4121.99 16.87 24 1003 80.24 10.03 2431.9741 16.37 25 708 56.64 7.08 1716.6876 16.37 26 148 11.84 1.48 358.8556 15.75 27 967 77.36 9.67 2344.6849 16.3 28 1276 102.08 12.76 3093.9172 16.87 29 1381 110.48 13.81 3348.5107 16.87 30 572 45.76 5.72 1386.9284 16.37 31 734 58.72 7.34 1779.7298 15.94 32 442 35.36 4.42 1071.7174 16.48 33 609 48.72 6.09 1476.6423 16.48 34 204 16.32 2.04 494.6388 15.99 Glastonbury 1 279 22.32 2.79 676.4913 15 2 466 37.28 4.66 1129.9102 15 3 716 57.28 7.16 1736.0852 15.16 4 1678 134.24 16.78 4068.6466 15.26 5 1221 97.68 12.21 2960.5587 15.16 6 610 48.8 6.1 1479.067 15.16 7 497 39.76 4.97 1205.0759 15.42 8 1681 134.48 16.81 4075.9207 15.42 9 764 61.12 7.64 1852.4708 15.15 10 392 31.36 3.92 950.4824 15.42 11 470 37.6 4.7 1139.609 15.42 12 600 48 6 1454.82 15.15 13 366 29.28 3.66 887.4402 15.15 Godney 81 6.48 0.81 196.4007 NA

April 2009 Updating and Screening Assessment Mendip District Council- England

Hemington 263 21.04 2.63 637.6961 15.37 Holcombe 382 30.56 3.82 926.2354 15.44 209 16.72 2.09 506.7623 15.45 Leigh-On-Mendip 200 16 2 484.94 16.24 Litton 90 7.2 0.9 218.223 NA Lullington 56 4.48 0.56 135.7832 NA Lydford-On-Fosse 185 14.8 1.85 448.5695 NA 495 39.6 4.95 1200.2265 15.57 Mells 289 23.12 2.89 700.7383 22.23 North Wootton 111 8.88 1.11 269.1417 NA Norton St Philip 358 28.64 3.58 868.0426 15.39 Nunney 380 30.4 3.8 921.386 16.62 Pilton 381 30.48 3.81 923.8107 15.45 230 18.4 2.3 557.681 14.64 69 5.52 0.69 167.3043 NA Rode 377 30.16 3.77 914.1119 15.62 509 40.72 5.09 1234.1723 14.84 Selwood 321 25.68 3.21 778.3287 NA Shepton Mallet 1 510 40.8 5.1 1236.597 15.45 2 1359 108.72 13.59 3295.1673 15.87 3 2249 179.92 22.49 5453.1503 15.87 4 467 37.36 4.67 1132.3349 15.92 5 53 4.24 0.53 128.5091 15.92 6 291 23.28 2.91 705.5877 15.45 7 1192 95.36 11.92 2890.2424 15.87 8 703 56.24 7.03 1704.5641 15.87 9 493 39.44 4.93 1195.3771 15.92 10 606 48.48 6.06 1469.3682 15.92 11 164 13.12 1.64 397.6508 15.57 12 288 23.04 2.88 698.3136 15.5 13 520 41.6 5.2 1260.844 15.5 14 533 42.64 5.33 1292.3651 15.9 15 737 58.96 7.37 1787.0039 15.9 16 295 23.6 2.95 715.2865 15.47 1478 118.24 14.78 3583.7066 NA 364 29.12 3.64 882.5908 21.39 197 15.76 1.97 477.6659 NA Stratton On The Fosse 303 24.24 3.03 734.6841 15.45 Street 1 564 45.12 5.64 1367.5308 15.15 2 299 23.92 2.99 724.9853 15.47 3 648 51.84 6.48 1571.2056 15.47 4 377 30.16 3.77 914.1119 15.44 5 613 49.04 6.13 1486.3411 15.44 6 1133 90.64 11.33 2747.1851 15.4 7 848 67.84 8.48 2056.1456 15.4 8 621 49.68 6.21 1505.7387 15.1 9 394 31.52 3.94 955.3318 15.44 10 1166 93.28 11.66 2827.2002 15.44 11 1309 104.72 13.09 3173.9323 15.4 12 437 34.96 4.37 1059.5939 15.4

Updating and Screening Assessment April 2009 Mendip District Council - England

13 1107 88.56 11.07 2684.1429 15.1 14 805 64.4 8.05 1951.8835 15.14 15 302 24.16 3.02 732.2594 15.14 16 685 54.8 6.85 1660.9195 15.1 17 396 31.68 3.96 960.1812 15.14 73 5.84 0.73 177.0031 NA 145 11.6 1.45 351.5815 15.76 52 4.16 0.52 126.0844 NA Walton 451 36.08 4.51 1093.5397 15.02 176 14.08 1.76 426.7472 NA Wells 1 82 6.56 0.82 198.8254 15.74 2 535 42.8 5.35 1297.2145 15.5 3 654 52.32 6.54 1585.7538 15.74 4 471 37.68 4.71 1142.0337 15.74 5 722 57.76 7.22 1750.6334 15.91 6 1093 87.44 10.93 2650.1971 15.91 7 902 72.16 9.02 2187.0794 15.36 8 973 77.84 9.73 2359.2331 15.61 9 1175 94 11.75 2849.0225 16.6 10 1703 136.24 17.03 4129.2641 16.6 11 492 39.36 4.92 1192.9524 16.07 12 309 24.72 3.09 749.2323 15.66 13 912 72.96 9.12 2211.3264 15.61 14 1125 90 11.25 2727.7875 16.6 15 1065 85.2 10.65 2582.3055 16.6 113 9.04 1.13 273.9911 NA 249 19.92 2.49 603.7503 14.75 Westbury Sub Mendip 330 26.4 3.3 800.151 14.91 Whatley 109 8.72 1.09 264.2923 NA 146 11.68 1.46 354.0062 NA Wookey 498 39.84 4.98 1207.5006 14.81

Table 9-8 Combined impacts (PM10) of biomass combustion

April 2009 Updating and Screening Assessment Mendip District Council- England

9.5 Appendix E: Comparison of NO2 Monitoring results from longer-term sites

Figure 9-8 NO2 trend at Monmouth Drive, Frome

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30 ug m^-3

20 -

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0 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008

Figure 9-9 NO2 trend at Street

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20

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0 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008

Updating and Screening Assessment April 2009 Mendip District Council - England

Figure 9-10 NO2 trend Bath Street, Frome

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30 ug m^-3

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0 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008

Figure 9-11 NO2 trend Walton

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ug m^-3 -

20.00 -

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0.00 2001 2002 2003 2004 2005 2006 2007 2008

April 2009 Updating and Screening Assessment Mendip District Council- England 9.6 Appendix F: Permitted Activities in Mendip

Operator Postcode Installation Regulator BA16 Small waste oil Mendip Arnie Levics 0HA burner DC BA11 Small waste oil Mendip Nunney Catch Motor Company 4NX burner DC Small waste oil L A Moore BA5 1AH burner + mobile Mendip crushing DC Small waste oil Mendip Webbs Garage BA5 burner DC Petrol station Mendip Farleigh Service Station BA2 7TP >500m3 DC Petrol station Mendip Shepton Mallet Motors BA4 5SB >500m3 DC Petrol station Mendip Broadway Garage BA3 4JW 3 >500m DC Petrol station Mendip Wells Service Station BA5 2PJ >500m3 DC BA11 Petrol station Mendip Bathway Service Station 6SF >500m3 DC Petrol station Mendip Charlton Garage BA4 5PD >500m3 DC BA11 Petrol station Mendip J Sainsbury 4DH >500m3 DC Petrol station Mendip Moff Motors BA7 7PF 3 >500m DC BA11 Petrol station Mendip Asda 5PA >500m3 DC BA16 Petrol station Mendip J Sainsbury Plc 0HS >500m3 DC BA11 Petrol station Mendip Motorcare 1QX >500m3 DC Petrol station Mendip Wirral Park Service Station BA6 9XE >500m3 DC Petrol station Mendip Wm Morrison Supermarkets Plc BA6 9ED >500m3 DC BA11 Petrol station Mendip Nunney Catch Service Station 4NZ >500m3 DC BA11 Mendip J W Singer 4RW Brass foundry DC Mendip Rebastone (Aggregate Ind.) BA3 5RX Cement batching DC BA11 Mendip CPM Group 3PD Cement batching DC Mendip Vobster Cast Stone BA3 5RY Cement batching DC Mendip Tor Multimix BA6 9LU Cement batching DC Mendip Aggregate Industries BA11 Cement batching DC Mendip Torr Blocks BA4 4SQ Cement batching DC Mendip Forticrete BA3 4EA Cement batching DC Mendip P D Edenhall BA4 4SQ Cement batching DC Stowell Concrete Ltd BA3 5DA Cement batching Mendip

Updating and Screening Assessment April 2009 Mendip District Council - England

DC Mendip Archeson Glover BA5 3NT Cement batching DC BA11 Quarrying + Tarmac 3RD Roadstone coating + Mendip Cement batching DC BA11 Aggregate Ind. Quarrying + Mendip 4PX Roadstone coating DC Mendip R M Penny (Plant Hire) Ltd BA3 4BY Mobile crushing DC Mendip Flymart BA5 1RW Mobile crushing DC Mendip Francis Flower BA3 4TE Cement batching DC Quarrying + Hanson Agg. BA11 3LF Roadstone coating + Mendip Cement batching DC Quarrying + Morris & Perry BA3 4TE Roadstone coating + Mendip Cement batching DC Aggregate Industries UK Ltd BA4 4SQ Quarrying + Mendip Roadstone coating DC J Wainwright BA3 5JU Quarrying + Mendip Roadstone coating DC BA11 Mendip A J Charlton & Son Ltd 2RH Timber DC Timber BA6 9LX Timber + Timber Mendip treatment DC Underwood Car & Commercial Mendip BA5 1AF Ltd Vehicle refinishing DC Mendip Avalon Motor Co Ltd BA6 9AG Vehicle refinishing DC BA11 Mendip Barnes Coachworks 4BG Vehicle refinishing DC BA11 Mendip Frome Garage 4BN Vehicle refinishing DC BA11 Mendip Frome Valley Cleaners 2EN Dry Cleaners DC Mendip Johnson Cleaners UK Ltd BA5 2AA Dry Cleaners DC BA16 Mendip Beau Brummell 0EB Dry Cleaners DC BA16 Mendip Street Dry Cleaners 0ER Dry Cleaners DC Mendip Jo Francis Cleaners BA5 2DP Dry Cleaners DC Petrol station Mendip Tesco BA4 5SB >500m3 DC Mendip Andrew Hopkins Ltd Cement batching DC Small waste oil Mendip Rapsons Garage BA6 9ND burner DC Mendip Butler Tanner Dennis BA11 Printing DC A & C Urch LLP BA4 4LG Poultry EA O P Hoddinott & Sons Ltd BA5 1QJ Poultry EA F Christensen & Sons BA4 4EH Poultry EA Millard Poultry Ltd. BA5 1RZ Poultry EA

April 2009 Updating and Screening Assessment Mendip District Council- England

P & S Watts & Partners BA5 1AR Poultry EA Steanbow Farm Partnership BA4 4EH Poultry EA B & J Pigs Ltd. BA4 4SU Piggery EA JJ Saunders Ltd BA3 4RX Piggery EA Piggery + Food AJ & RG Barber Ltd BA4 6PR Processing EA Wyke Farms Ltd BA4 6NX Piggery EA May Gurney BA4 6NA Waste License EA BA11 Milk Link Processing 2NQ Food Processing EA BA11 Cliniserve 2FE Autoclave EA BA11 Western Skip Hire 3PH Landfill EA Thomas J C & Sons Ltd BA6 9LU Waste License EA BA11 Wessex Incineration Company 5ES WID EA Inveresk Paper Mill BA5 1AH Paper Mill EA

Updating and Screening Assessment April 2009