Carbon Monoxide Updating & Screening Assessment (A) Monitoring data Overview Stage 1 assessment revealed no areas of concern and so there was no monitoring undertaken. Consideration of the background data avaialble on the archive site shows the background values not to be significant. Guidance indicates that exceedance of the objective is very unlikely to occur except at very busy roads and/or junctions in built up areas. Approach National Inventory background concentrations show average of 0.21 3 mg/m (Range 0.17 to 0.28) cf 3 annual standard 10 mg/m ( 8 hour Collate all CO monitoring data average). Monitoring data shows there is no exceedance of the 8- hour objective when annual mean is 3 <2 mg/m (B) Very busy roads or Approach junctions in built up areas There are no busy roads as defined in the LAQM.TG(03) Conclusion Traffic flow data from Gloucestershire County Council indicates that there are no roads or junctions that meet the above criteria in Tewkesbury Borough Councils area. There have been no significant changes within the district since the Stage 1 review, which concluded that further assessment of this pollutant, was not necessary. Therefore there is no requirement to proceed with a further detailed assessment for this pollutant. Benzene Updating & Screening Assessment (A) Monitoring data Overview Stage 1 assessment revealed no areas of concern and so there was no monitoring undertaken. Consideration of the National background data shows the background values not to be significant. (B) Very busy roads or Approach junctions in built up areas There are no busy roads as defined in the LAQM.TG(03) (C) Industrial Sources Approach There are no industrial sources as defined in the LAQM.TG(03) of concern within within or adjacent to the Borough. (D) Petrol Stations Approach There are no petrol stations with accommodation within 10 metres as defined in the LAQM.TG(03) (E) Major fuel storage depots Approach (petroleum only) There are no fuel depots as defined in the LAQM.TG(03) Conclusion The only relevant area for concern found was that associated with Service Stations purveying petrol. Examination of known service stations in the Borough show that none fall within the above distance criteria in Tewkesbury Borough Councils area. There have been no other significant changes within the district since the Stage 1 review, which concluded that further assessment of this pollutant, was not necessary. Therefore there is no requirement to proceed with a further detailed assessment for this pollutant. 1,3 Butadiene Updating & Screening Assessment (A) Monitoring data Overview Guidance indicates that on a National level monitoring data shows a running average well below the the 2003 objective for this pollutant. In respect of Industrial premises there are 2 Rubber processes, potentially capable of producing the pollutant, prescribed as Part B Authorised Premises in the Borough Councils area of responsibilty. (B) New Industrial Premises Approach There have been no new industrial premises, capable of producing this pollutant, introduced either into or adjacent to the Borough area since the Part 1 Review and Assessment. (C) Industrial Sources Approach Two Industrial processes both Authorised under LA-PPC are known to produce raw rubber and various products within the Borough and potentially emit this pollutant. Whilst initially they were both considered and assessed as not likely to give rise to a problem with production of 1,3 Butadiene, one of the sites now produces raw rubber for all of its operations in the UK and produces considerably more product than the smaller of the 2 operations. This has led to an increase in overall emissions. The firm achieves compliance with the requirements of the authorisation via Clause 19 of Guidance Note PG6/28(97) in terms of Kilogrammes of solvent emitted per tonne of rubber processed. In 1992 the figure was 33.3 Kg solvent/tonne of rubber reducing to 1.2 Kg solvent/tonne of rubber in 2001 and rising again in 2002 up to 3.4 Kg solvent/tonne of rubber. The firm was approached in 2001 and undertook an assessment and calculations in order to produce an annual mass emission and concentration figure in respect of 1,3 Butadiene at the site boundary. (D) Emission Results Approach A series of readings were taken from 3 stacks concerned. These resulted in an assessment of background levels being made by the consultants conducting the measurements. The total mass emission was calculated at 1.87 kg per year, which was well below the level which the nomogram provided in the guidance would indicate that a problem might exist.The calculations were, in addition, checked by Consultants to the Council. Conclusion As there is no likelihood of the objective for this pollutant to be exceeded guidance indicates that no further action need be taken. Lead Updating & Screening Assessment (A) Monitoring data Overview Stage 1 assessment revealed no areas of concern and so there was no further monitoring undertaken. Consideration of the background data shows the background values not to be significant. (B) New Industrial Processes Approach There are no industrial sources as defined in the LAQM.TG(03) of concern within within or adjacent to the Borough. Conclusion There have been no significant changes to industries in or around the district that would give rise to exceedences, therefore there is no requirement to proceed further for this pollutant. Nitrogen Dioxide Updating & Screening Assessment Road Traffic Overview DMRB predicted NO2 concentrations based upon the 2001 traffic data were generally in reasonable agreement with measured data from diffusion tubes deployed in the area. No exceedences were predicted by the DMRB Screening Method, either for the 2001 or 2005 traffic data at any of the locations considered. DMRB estimates for 2005 traffic data show reductions, relative to 2001 data, in ambient NO2 concentrations of between 4 and 7 µg m- 3 in the vicinity of the roads considered. Differences were observed between predictions for the 2 sites in Tewkesbury High Street. These differences were attributed to the fact that the Vidivision site has taller buildings around it and is closer to the carriageway and provides a greater restriction to the dispersal of pollutant emissions from passing vehicles. The Vididvision site has been subject to real time chemiluminescent measurements and the Authority are satisfied with the diffusion tube data and accuracy of the predictions. Using the 2001 traffic data for Withybridge Gardens, immediatley adjacent to the M5, the DMRB Screening Method predicted an exceedence of the Annual Objective Value of 40 µg m‑3 for NO2 in 2003 cf the measured value of 38 µg m‑3. It was recommended by Consultants that Tewkesbury Borough Council should consider the need for an extended measurement programme using the reference chemiluminescence method to quantify ambient NO2 concentrations more accurately. Monitoring (A) Monitoring data outside an Action AQMA The data provided below are collated from the 20 Nitrogen Dioxide diffufion tubes located through out the Borough's area of responsibility. Six tubes are located to accord with the National NO2 survey requirements and all are located in areas deemed to be at risk of possibly exceeding the annual average objective following the earlier Review and Assessments conducted by the Authority. The tube supplier was changed on 1 April 2002 from AEA to GRADCO using the same preparation 50:50 TEA. Tube Bias was established by exposing 3 tubes every month at Cheltenham Borough Councils real time chemiluminescent urban monitoring station. Approach Collated data since 1 April 2002 Date/Site Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 Apr-02 16 13 6 8 6 13 7 6 7 16 9 10 10 8 4 3 3 3 8 May-02 10 16 4 5 9 15 10 6 6 16 11 6 9 9 4 2 3 2 6 Jun-02 7 9 5 2 11 16 12 8 11 20 16 8 16 12 10 6 3 3 4 10 Jul-02 17 22 6 6 9 13 13 7 6 18 14 9 13 14 11 4 2 4 2 10 Aug-02 15 16 7 6 10 10 11 5 7 11 15 10 16 15 8 5 3 4 3 12 Sep-02 11 12 11 10 12 8 10 4 7 15 8 8 6 9 8 5 3 5 4 11 Oct-02 10 9 5 10 6 8 3 6 12 6 6 5 7 7 4 3 4 3 9 Nov-02 8 7 4 13 12 11 9 11 14 13 12 13 12 12 11 9 9 8 14 Dec-02 0 16 12 11 17 18 14 10 13 20 14 10 17 16 12 9 8 7 5 12 17 Jan-03 0 20 10 11 17 18 14 10 13 20 15 10 17 16 12 9 8 7 5 12 17 Feb-03 23 14 13 19 14 17 15 14 18 17 17 17 17 19 12 11 12 11 18 19 Mar-03 17 18 10 10 18 15 13 14 20 19 12 17 13 7 7 8 6 16 17 Apr-03 17 15 8 8 14 14 13 9 10 18 17 10 15 14 12 5 6 6 5 19 12 May-03 13 20 5 5 10 16 11 7 8 19 13 11 13 8 4 3 3 2 7 8 Average ppb 11 14 7 7 12 13 12 8 10 16 13 10 13 13 11 7 6 6 6 12 16 Average mgm/m3 21 26 14 14 22 25 22 15 18 31 25 19 24 25 21 13 11 12 11 24 30 Bias Factor 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 Corrected Value 25 32 17 17 26 30 27 18 22 38 30 23 29 31 25 16 13 15 13 28 36 Limit Value 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 The DMRB Calculations associated with sites indicated as below were subcontracted to Millenium Science and their report is attached. Site Location Grid Ref 1 Site Description Site 1 = Sutherlands 895327 Tewkesbury High Street Location DMRB Site 2 = Vidivision 889324 Tewkesbury High Street Location DMRB Site 3 = Tewkesbury Hospital 897327 Back ground site NO2 Survey Site 4 = Mitton School 902327 Back ground site NO2 Survey Site 5 = Dupont 888 164 Brockworth High Street location NO2 Survey Site 6 = Windrush Belmont Ave 875169 M5 Site survey Site 7 = 32 Ermin Street 895 163 Background site NO2 Survey Site 8 = 40 cedar Road 886 173 Background site NO2 Survey Site 9 = 3 Stocken Close 876168 M5 Site survey Site 10 = Withybridge Gds 905255 M5 Site survey DMRB Site 11 = High Street. Winchcombe. 026 284 Town centre location DMRB Site 12 = White Bear 896 333 Town centre location - possible road extension Site 13 = 77 Sussex Gds B'ckworth 897173 M5 Site survey DMRB Site 14 = Ashchurch Village Hall. 928 333 A46 Roadside location DMRB Site 15 = Shorekarn. 904 331 A46 Roadside location Site 16 = Woolstone. 968 305 Background site NO2 Survey Site 17 = Chargy Hill Farm. 805 235 Background site NO2 Survey Site 18 = Harkaway. 853 323 Background site NO2 Survey Site 19 = Snowshill. 095 335 Background site NO2 Survey Site 20 = Showborough. 907 382 M5 Site survey Site 21 = Sussex Gardens 877 172 M5 Site survey new location DMRB Monthly Nitrogen Dioxide Results TBC Monitroring Stations 2002 - 2003 30 25 Parts Per Billion 20 15 10 5 0 37257 37288 37316 37347 37377 37408 37438 37469 37500 37530 37561 37591 37622 37653 37681 37712 37742 Month Tewkesbury - Sutherlands High Street Tewkesbury - Vidivision High Street Tewkesbury -Hospital Tewkesbury - Mitton Scholl Brockworth - Dupont M5 (S) - Belmont Avenue Windrush Brockworth - Ermin Street Brockworth - 40 Cedar Road M5 (S) - Stoken Close M5 (CEN) - Withybridge Winchcombe - High Street Tewkesbury - White Bear M5 (S) - Sussex Gardens A46 - Ashchurch Village Hall A46 - Tewkesbury Shorekarn Woolstone Oxenton Hill Maisemore Chargey Hill Fothampton Harkaway Snowshill M5 (N) - Showborough M5 (S) - Sussex Gardens The above graph is a representation of bias corrected data since measurements with Gradco Tubes started in April 2002. It includes data from January 2002 collected using AEA supplied tubes, for comparison. As may be seen the overall trend is downwards. The drop in values in April 2002 was a consequence of the change of tube supplier however the downward trend continues. As may be seen the results are less disparite in May 2003 cf January 2002 and may be indicative of laboratory accuracy. (B) Monitoring Data within an Approach AQMA The AQMA jointly declared by the Stroud and Tewkesbury Authorities has now been revoked. The associated Stage 4 Report was accepted by DEFRA (Letter dated 21 May 2003). The DEFRA response drew to the Authorities attention the need to keep the situation under careful monitoring review in the period to 2005 in order to confirm the DMRB predictions. A Copy of the report is attached. (C) Narrow congested streets with Approach adjacent residential properties Sites numbered 1, 2 & 11 are all Town centre locations and which fit in with the definition of potential Street Canyons. As may be noted from the results of diffusion tube monitoring (25, 32 & 30 µg m3 ) respectively there seems little cause for concern. DMRB calculations carried out by MSE (based on Version 1.01 February 2003) for 2005 gave values of 30, 34 & 30 µg m3 respectively. (D) Junctions Approach Sites numbered 1, 10 & 13 were identified as falling into this category. The measured results for 2002 were 25, 38 and 29 µg m3 respectively. The MSE report indicated that the DMRB values based on traffic flows for 2001 were likely to continue to fall. However given the constraints of the DMRB and the accuracy of the diffusion tube the Withybridge site may remain borderline in terms of compliance for 2005. Note that MSE were only given data up to and including Feb 2003. Subsequent data appears in this report, which may account for slight differences in values quoted by MSE. (E) Busy Streets people exposed Approach > 1 hour There are no locations within the Borough similar to those mentioned (F) Roads with high flows of Approach buses and/or HGV's There are no locations within the Borough similar to those mentioned (G) New Roads constructed or Approach proposed since the first round of R & A. The A46 at Ashchurch was highlighted in the stage 3 R&A. It was intended to alter the line of the road such that the traffic would move a further 6 metres away from a sensitive school location. This allied with the predicted drop for 2005 as calculated by DMRB should bring the final value well within the objective value for 2005.The road is currently in the construction phase. (H) Roads close to objective Approach during the first round of R&A. The M5 AQMA has now been revoked but it is intended to conduct further chemiluminescent measurements to confirm predictions (I) Roads with significantly Approach changed traffic flows. There are no locations within the Borough similar to those mentioned (J) Bus Stations Approach There are no locations within the Borough similar to those mentioned (k) New Industry Approach There is no new industry in the Borough with any significant emissions (L) Industrial sources with Approach substantially increase emissions There are no industrial premises within the Borough with any substantially increased emissions (M) Aircraft Approach The criteria for assessement are well below the required parameters. (N) Diesel & Coal-Fired Approach locomotives There is a Network Rail line and preserved Railway in the Borough. Both types of locomotive in use emit nitrogen oxides but guidance indicates that there is no evidence to suggest that there is any risk of either the 1 - hour or annual mean objectives for nitrogen dioxide in 2005 being exceeded. Conclusion NO2 is set to achieve compliance with the objective target values for 2005. In accordance with advice received in respect of the revocation of the AQMA at Hucclecote (joint declaration with Stroud) it is intended to monitor actual values of NO2 at sites close to the M5 during 2004 in order to confirm the predictions for 2005 and 2010. Particulate (PM 10) Updating & Screening Assessment (A) Monitoring Data outside AQMA Overview The Part 3 Review and Assessment conducted by TBC indicated that there was no likely exceedances of the NAQS Objective likely to take place in the Borough. More recent data obtained from the two monitoring stations at Cheltenham (urban) and Forest of Dean (rural) indicates those locations being well within limits. There seems little cause for concern in Tewkesbury Borough area. (B) Monitoring Data inside AQMA Action The AQMA previously declared is now in the process of being rescinded. A special report undertaken during the Part 3 Review and Asessment alongside the M5 (a primary source or particulate) showed levels well below the National objective. See the following site for more detail: http://www.tewkesburybc.gov.uk/living/health/documentation/air_quality.pdf (D) Junctions Action There were 10 junctions assessed as over 10000 vehicles per day identified. This included Tewkesbury Town Centre as well as Motorway junctions with Trunk and minor roads all with relevant exposure within 10m. DMRB Calculations were undertaken for several of these locations. There were no exceedances of either the 40 µg/m3 (Gravimetric) annual mean or the 50 µg/m3 (Gravimetric) 24 hour mean x 35 values predicted for 2004. Location Year Dist to Flow LDV HGV Back Annual Days Centre AADT % % Ground Mean Exceeded Tewkesbury 2004 10 10800 98 2 17.6 Cross 2004 10 5000 98 2 17.6 2004 10 11600 98 2 17.6 29 23 Withybridge 2004 40 71200 91 9 17.6 2004 90 18300 96 4 17.6 23 8 Teddington 2004 20 14200 93 7 17.6 2004 15 6300 98 2 17.6 2004 15 15300 93 7 17.6 2004 10 8600 98 2 17.6 28 23 Sussex Gdns 2004 400 39700 92 8 17.6 2004 40 64572 91 9 17.6 21 5 (E) Roads with High Flows HGV & Buses Action There were no unusually high levels of HGV and Bus flow (i.e. over 20%) noted. The DMRB calculations at (D) covered the highest known. (F) New Roads since last round Action A new railway bridge on the line of the A46 is currently under construction.This will improve the AQ situation as reported in the Part 3 Review and Assessment. The road has been taken further away from existing target population by an extra 10 meteres or more thus leading to improvements in measured levels. (G) Roads close to objective in last round Action Covered in the assessment at (D) (H) Roads with significantly changed traffic Action flows There are no roads with significantly changed traffic flows (I) & (J) New and Substantially increased Action emissions from Industry There are no new industrial processes neither are there any which have significantly increased emissions (K) & (L) Coal Burning and Quarries etc Action There is little coal burning within the Borough and only one quarry. The latter has no sensitive premises within .5 of a mile. The landfill operation within the area is controlled by the Environment Agency and conditions exist to control particulate emissions. (M) Aircraft Action Gloucester Airport is a small provincial airfield and passenger numbers are extremely small with only light aircraft traffic on a daily basis and one regular flight to Jersey which operates at weekends. It falls outside the suggested parameters requiring further work Conclusion There have been no significant changes to industrial proccesses in or around the district or changes in traffic numbers that would be likely to affect levels of PM10. Therefore, against 2004 objectives it is not likely that exceedences will occur. Further assessment will be considered for the next progress report taking into consideration TG(03) for 2010 objectives. Sulphur Dioxide Updating & Screening Assessment (A) Monitoring data Overview Stage 1 Assessment revealed no areas of concern regarding this pollutant. Following discussion with the Gloucestershire Pollution Group a diffusion tube was placed in the north of the area as part of an area wide monitoring regime to look at background levels only. The measurements were made in concert with others in different parts of the area i.e. Forest of Dean, Cotswold and Stroud (see table below). Annual Average SO3 Diffusion Tube Data Site 1999 2000 2001 2002 FOD 1 4 3.3 4 2.3 FOD 2 6.7 6.2 2.2 2.9 FOD 3 6.8 COTSWOLD 2.8 4.2 STROUD 7.4 6.9 STROUD 5.1 6.4 TEWKESBURY 6.9 4.3 3.7 Annual Average Standard 20 µg/m3 As may be seen there are very low ambient concentrations of sulphur dioxide recorded by diffusion tube over the period with a general decrease evident. Annual mean concentrations of sulphur dioxide are well within the 20 µg m3 limit prescribed by the AQS for the protection of vegetation and ecosystems. [C] New Industrial Sources Action There is no new industry either in or adjacent to the Borough which uses significant amounts of hydocarbons other than gas. [D] Industrial Sources - increased emissions Action There is no new industry either in or adjacent to the Borough which uses significant amounts of hydocarbons other than gas. [E] Domestic Burning Action There is no significant coal burning in the area under review nor in adjacent areas. [F] Boilers > 5MW(Thermal) Action There are no boilers in this category using any fuel other than gas. [G] Shipping Action There is no shipping other than canal barges used for social purposes [H] Railways Action There is one Network Rail main line route through the District but only 1 station for local trains. There is in addition a preserved railway operating in the District using both Steam and Diesel locomotives. Conclusion There are no major concerns regarding emissions of SO2 in the area either from industry or domestic sources. The matter of exposure to coal generated SO2 from Steam locomotives is one which will require further work to be undertaken and it is hoped to collaborate with other local authorities in similar situations to progress this issue. A detailed assessement will therefore need to be undertaken in this specific area. There are no major concerns regarding emissions of SO2 in the area either from industry or domestic sources. The matter of exposure to coal generated SO2 from Steam locomotives is one which will require further work to be undertaken and it is hoped to collaborate with other local authorities in similar situations to progress this issue. A detailed assessement will therefore need to be undertaken in this specific area.
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