{"text_format":"1","workbook":"xlsx","n_sheets":12,"sheets":["Cover","Notes","Introduction","1) a) Source","1) b) Pathway","1) c) Receptors","2) Site Hazard Rating","3) Likelihood","4) Site Risk and Classification","5) Standard Containment Designs","Sheet1","Risk Scoring"],"not_rendered":{"charts":0,"images":49,"macros":1,"external_links":1,"defined_names":56,"comments":4,"pivot_tables":0},"unopened":[],"bounds":{"document_bytes":16777216,"sheet_cells":100000,"rows_first":2000,"rows_last":500,"rows_between":2000,"halvings":0,"cell_chars":16384,"cell_head_chars":4096},"cells_cut":0,"cells_raw":0,"read":"whole","date_system":"1900"}

{"sheet":"Cover","index":0,"n_rows":59,"n_cols":6,"rows_kept":59,"cut":false,"hidden":false,"merged":[]}
[]
[]
[]
[]
[null,"JOB TITLE",null,null,null,"Yorkshire Water IED Permit"]
[]
[null,"JOB NUMBER"]
[]
[null,"MADE BY",null,null,null,"Kiran Parmar"]
[]
[null,"CHECKED BY"]
[]
[null,"DATE",null,null,null,"2023-01-19"]
[]
[null,"Description of spreadsheet",null,null,null,"This spreadsheet provides a secondary containment risk assessment for Esholt Sludge Treatment Facility (STF) using the Anaerobic Digestion and Biogas Association (ADBA) secondary containment risk assessment tool. "]
[]
[null,"Sheet Number prefix",null,null,null,""]
[]
[null,"Member/Location",null,null,null,""]
[]
[null,"Drawing Reference",null,null,null,""]
[]
[null,"Filename",null,null,null,{"$f":"IF(CELL(\"filename\")=\"\",\"\",LEFT(CELL(\"filename\"),FIND(\"]\",CELL(\"filename\"))))","v":{"$error":"#VALUE!"}}]
[]
[]
[null,"CONTENTS OF SPREADSHEET"]
[]
[null,"Sheet",null,"Description"]
[null,"Cover"]
[null,"Notes"]
[null,"Introduction",null,"Introduction to the ADBA Tool"]
[null,"1 a) Source",null,"The inventory of materials for Esholt STF is provided in the worksheet 1a) Source "]
[null,"1 b) Pathway",null,"The Pathway information for Esholt STF is provided in the worksheet 1) b) Pathway "]
[null,"1 c) Receptors",null,"The Receptor information for Esholt STF is provided in the worksheet 1) c) Receptor."]
[null,"2) Site Hazard Rating",null,"The Site Hazard Rating is displayed in the worksheet 2) Site Hazard Rating"]
[null,"3) Likelihood",null,"The likelihood of loss of primary containment and the associated mitigation."]
[null,"4) Site Risk and Classification",null,"The Site Hazard Rating and Classification is in this worksheet"]
[null,"5) Standard Containment Design",null,"The Standard Containment Design is in this worksheet"]
[]
[]
[]
[]
[null,"AUTHORISATION OF LATEST VERSION"]
[]
[null,"Type and method of check",null,null,null,"Review of method, inputs and assumptions"]
[]
[null,"Signatures & dates:",null,null,"Made by ","Kiran Parmar"]
[]
[null,null,null,null,"Checked "]
[]
[null,null,null,null,"Approved"]
[]
[null,"REVISIONS",null,null,"Current Revision ",2]
[]
[null,"Rev.","Date","Made by","Checked"," Description"]
[null,0,"2021-06-02","KP",null,"Source, Pathway Receptor, Likelihood Drafted"]
[null,1,"2021-06-08","SW",null,"Document review"]
[null,2,"2021-06-10","KP",null,"Comments incorporated"]
[null,3,"2023-01-17","KP","SW","Inclusion of new information"]

{"sheet":"Notes","index":1,"n_rows":62,"n_cols":3,"rows_kept":62,"cut":false,"hidden":false,"merged":[[39,1,39,2],[46,1,46,2],[52,1,52,2],[61,1,61,2],[1,1,1,2],[3,1,5,2],[6,1,6,2],[7,1,9,2],[15,1,15,2],[19,1,19,2]]}
[]
[null,"(1) Purpose of spreadsheet"]
[]
[null,"This spreadsheet outlines the information and data utilised, as well as the assumptions applied to undertake a secondary containment risk assessment for Esholt STF based on the using the Anaerobic Digestion and Biogas Association (ADBA) secondary containment risk assessment tool and associated guidance. The ADBA risk assessment is based on CIRIA 736  Containment systems for the prevention of pollution: Secondary, tertiary and other measures for industrial and commercial premises."]
[]
[]
[null,"(2) Key Assumptions"]
[null,"Any assumptions are outlined in the spreadsheet."]
[]
[]
[]
[]
[]
[]
[]
[null,"(3) Basis of calculations"]
[]
[null,"ADBA Risk Assessment tool."]
[]
[null,"(4) References"]
[null,"All references are outlined in the spreadsheet."]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[null,"(5) Special features"]
[]
[null,null,"Input Cell"]
[null,null,"Key Outputs"]
[]
[]
[]
[null,"(6) Holds or items that require Clarification"]
[]
[]
[]
[]
[]
[null,"(7) Summary"]
[]
[]
[]
[]
[]
[]
[]
[]
[null,"Best Practice Guide"]

{"sheet":"Introduction","index":2,"n_rows":75,"n_cols":9,"rows_kept":75,"cut":false,"hidden":false,"merged":[]}
[]
[null,null,null,null,null,null,null,"Although this tool works as a standalone tool, we recommend you read this first:","ADBA CIRIA736 Bund Classification Assessment"]
[]
[null,"There are 5 steps to follow:"]
[]
[null,"1)","Identify the hazard posed to the environment by the inventory of materials held on the site and the location of the site"]
[null,null,"a. Categorise the source"]
[null,null,"b. Identify the pathways"]
[null,null,"c. Identify the receptor"]
[]
[null,"2)","The Site Hazard Rating is derived by this tool from the combination of the hazards assessed above"]
[]
[null,"3)","Calculate the likelihood of a loss of primary containment event occurring"]
[]
[null,"4)","The combination of the Site Hazard Rating and the likelihood of a loss of containment occuring gives the site risk rating and required secondary containment classification"]
[]
[null,"5)","From the class of containment needed, identify suitable designs from the 'Standard Containment Designs' sheet"]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[null,"Additional Guidance"]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[null,"The worksheets in this spreadsheet are protected to prevent inadvertant damage to the tool.  To remove the protection, the password is CIRIA736"]

{"sheet":"1) a) Source","index":3,"n_rows":97,"n_cols":15,"rows_kept":97,"cut":false,"hidden":false,"merged":[[37,1,37,3],[25,19,26,19],[4,13,4,18],[7,12,10,12],[5,12,5,14]]}
[]
[]
[]
[null,"Material","Physical properties","Quantity","units","Storage","Flammability","Corrosive","Ecotoxicity  (based on LD and quantity)","Environmental hazard rating ","Justification"]
[null,"Feedstock"]
[null,"Sludge liquid","Liquid",655,"m3","Single liquid import tank (8 years old) and associated pipework","Not flammable","No","Low","M","Permitted waste types are non-hazardous, low toxicity and the volume is below 1000m3",null,"Risk Quantification"]
[null,"Sludge liquid","Liquid",1250,"m3","Consolidation tank 5 (14 years old) and associated pipework","Not flammable","No","Low","H","Permitted waste types are non-hazardous, low toxicity and the volume is significant",null,"Material","Volume (m3)","Environmental Hazard Rating"]
[null,"Indigenous thickened sludge","Liquid",{"$f":"1200+1130","v":2330},"m3","Two mixed sludge tanks (8 years old) and associated pipework","Not flammable","No","Low","H","Permitted waste types are non-hazardous, low toxicity and the volume is significant",null,"Wet Sludge","0-99","Low"]
[null,"Unthickened sludge","Liquid",{"$f":"2155*2","v":4310},"m3","Two un-thickened sludge storage tanks (16 years old) and associated pipework","Not flammable","No","Low","H","Permitted waste types are non-hazardous, low toxicity and the volume is significant"]
[null,"Sludge cake","Solid","Deposited quantity moved to  within hours","m3","Cake reception Steel (8 years old)","Not flammable","No","Low","M","Largely immobile therefore presents only a medium risk.",null,null,"100-999","Medium"]
[null,null,null,null,null,null,null,null,"Feedstock Overall Rating","H","Hazards are \"Medium and High\" therefore the overall rating is High",null,null,"1000+","High"]
[null,"Process"]
[null,"Thickened sludge","Liquid",{"$f":"400*2","v":800},"m3","Two thickened sludge storage tanks (16 years old) and associated pipework","Not flammable","No","Low","M","Permitted waste types are non-hazardous, low toxicity and the volume is below 1000m3"]
[null,"Thickened sludge","Liquid",{"$f":"210+210+16.2+(22.71*6)","v":572.46},"m3","Thermal hydrolysis plant (THP): two feed silos, hopper and six tanks (8 yrs old) and associated pipework","Not flammable","No","Low","M","Permitted waste types are non-hazardous, low toxicity and the volume is below 1000m3"]
[null,"Thickened sludge","Liquid",39.520000000000003,"m3","Digester buffer tank (8 yrs old) and associated pipework","Not flammable","No","Low","L","Permitted waste types are non-hazardous, low toxicity and the volume is below 99m3"]
[null,"Digested sludge","Liquid",{"$f":"3533*4","v":14132},"m3","Four digesters at 3533 m3 each (three 13, and one 8 yrs old) and associated pipework","Not flammable","No","Low","H","Permitted waste types are non-hazardous, low toxicity and the volume is significant"]
[null,"Digested sludge","Liquid",{"$f":"685*2","v":1370},"m3","Two degassing tanks at 685 m3 each (14 yrs old) and associated pipework","Not flammable","No","Low","H","Permitted waste types are non-hazardous, low toxicity and the volume is significant"]
[null,"Digested sludge","Liquid",{"$f":"1604*2","v":3208},"m3","Two dewatering  tanks at 1604 m3 each (8 yrs old) and associated pipework","Not flammable","No","Low","H","Permitted waste types are non-hazardous, low toxicity and the volume is significant"]
[null,"Digested sludge","Liquid",{"$f":"1200+1130","v":2330},"m3","Two conditioning  tanks at 1,200 and 1,130 m3 (23 and 15 yrs old respectively) and associated pipework","Not flammable","No","Low","H","Permitted waste types are non-hazardous, low toxicity and the volume is significant"]
[null,"Digested cake","Solid","Variable quantity which is moved within hours","m3","Cake pad (33 yrs old) concrete not covered","Not flammable","No","Low","M","Largely immobile therefore presents only a medium risk."]
[null,"Digested cake","Solid","Variable quantity which is moved within hours","m3","Cake barn (8 yrs old) ","Not flammable","No","Low","M","Largely immobile therefore presents only a medium risk."]
[null,null,null,null,null,null,null,null,"Process Overall Rating","H","Hazards are \"Medium and High\" therefore the overall rating is High"]
[null,"Additives and site chemicals"]
[null,"Liquid polyelectrolyte, thickening building (storage, make-up and prep)","Liquid",16,"m3","Stored in fibre-glass containers and bunded as per YW asset standards","Not flammable","No",null,"L","Low ecotoxicity for the quantities stored"]
[null,"Powder polyelectrolyte, pre-THP","Solid",15000,"kg","Stored in fibre-glass containers and bunded as per YW asset standards","Not flammable","No",null,"M","Large quantatity stored, therefore medium risk presented."]
[null,"Liquid polyelectrolyte, pre-THP","Liquid",25,"m3","Stored in tanks and bunded as per YW asset standards","Not flammable","No",null,"L","Low ecotoxicity for the quantities stored"]
[null,"Digester anti - foam","Liquid",1,"m3","Stored securely in IBC on mobile bund as per YW EMS procedures","Not flammable","No",null,"L","Low ecotoxicity for the quantities stored"]
[null,"Dewatering anti-foam","Liquid",1,"m3","Stored securely in IBC on mobile bund as per YW EMS procedures","Not flammable","No",null,"L","Low ecotoxicity for the quantities stored"]
[null,"Powder polyelectrolyte – post-THP","Solid",15000,"kg","Stored in fibre-glass containers  and bunded as per YW asset standards","Not flammable","No",null,"L","Low ecotoxicity for the quantities stored"]
[null,"Liquid polyelectrolyte – post-THP, stream A","Liquid",25,"m3","Stored in fibre-glass containers and bunded as per YW asset standards","Not flammable","No",null,"L","Low ecotoxicity for the quantities stored"]
[null,"Liquid polyelectrolyte – post-THP, stream B","Liquid",1,"m3","Stored in fibre-glass containers and bunded as per YW asset standards","Not flammable","No",null,"L","Low ecotoxicity for the quantities stored"]
[null,"Diesel (boilers + THP fuel)","Liquid",108000,"L","Stored in steel construction tank vessel","Flammable","Yes",null,"H","Diesel has a high rating. This is used for machine maintenance, etc. and  is handled in batches and stored appropriately. "]
[null,"Diesel (off-road vehicles)","Liquid",2500,"L","Stored in steel construction tank vessel","Flammable","Yes",null,"H","Diesel has a high rating however there are only very small volumes, used for machine maintenance, etc. and this is handled and stored appropriately. "]
[null,"Glycol (anti-freeze)","Liquid",40,"L","IBC container and bunded","Not flammable","No",null,"L","Permitted material used for CHP, very little used and stored appropriately"]
[null,"CHP lubricating oil","Liquid",1,"m3","IBC container and bunded","Not flammable","No",null,"H","Oil has a high rating however there are only very small volumes, used for machine maintenance, etc. and this is handled and stored appropriately. "]
[null,"CHP waste lubricating oil","Liquid",800,"L","Steel drums in bunded areas","Not flammable","No",null,"H","Permitted waste types are hazardous however the volume is significant and this is handled and stored appropriately. "]
[null,null,null,null,null,null,null,null,"Chemicals Overall Rating","M","The overall source assessment for additives and site chemicals is  considered to be 'medium', because volumes handled in small batches and stored appropriately. "]
[null,"Fire fighting agents and cooling water spillages"]
[null,"Fire Fighting Agents harmful in their own right or contaminated by inventory","Liquid",null,null,null,"Not flammable","No","Low","L","Low in the ADBA Tool example."]
[null,"Fire fighting and cooling water contaminated by inventory","Liquid",null,null,null,"Not flammable","No","Low","L","Low in the ADBA Tool example."]
[]
[]
[null,null,null,null,null,null,null,null,"Spillages Overall Rating","L","All the hazards are \"Low\" therefore the overall rating is low"]
[]
[]
[null,null,null,null,null,null,null,null,"Sources Overall Hazard Rating",{"$f":"IF(OR(J11=\"H\",J22=\"H\",J37=\"H\",J43=\"H\"),\"H\",IF(OR(J11=\"M\",J22=\"M\",J37=\"M\",J43=\"M\"),\"M\",\"L\"))","v":"H"}]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
["H"]
["M"]
["L"]

{"sheet":"1) b) Pathway","index":4,"n_rows":92,"n_cols":36,"rows_kept":92,"cut":false,"hidden":false,"merged":[[5,0,8,0],[4,35,4,46],[4,22,4,30],[3,21,3,28]]}
[]
[null,null,null,null,null,null,null,null,null,null,null,"Postcode","BD10 0TW"]
[]
[null,"Pathway - the route from primary containment to receptor",null,null,null,null,null,null,null,"Environmental hazard rating ","Notes","Source","Description","Link","Image","Source","Description","Link","Image","Source","Description","Spill modelling "]
[null,"Site layout and drainage",null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,"AD Area spill modelling ",null,null,null,null,null,null,null,null,null,null,null,null,"DW Area spill modelling "]
[null,"If any of the site inventory has a runoff time of a few minutes…",null,null,null,null,null,null,null,"H","N/A"]
[null,"If any of the site inventory has a runoff time of a few hours.…",null,null,null,null,null,null,null,"H","It is assumed the site inventory has a runoff time of a few hours due to the form of sludge and the distance to the receptors in the AD area. Therefore a 'high' risk is given. . Additionally, a pathway to a River Aire exists with the south conditioning tank. The physical property of sludge at this stage is of a slow flowing suspension and relatively immobile given the permeable surface and vegetation cover of the pathway. Furthemore, a indirect pathway from the centrate balance tank exisits. Containment of the potential spill from these tanks will have to be managed.","Yorkshire Water","Model output for failure of  tanks is after column V"]
[null,"If any of the site inventory has a runoff time of a few days…",null,null,null,null,null,null,null,"M","N/A"]
[null,"If any of the site inventory has a runoff time of a few weeks…",null,null,null,null,null,null,null,"L","N/A"]
[]
[null,"Topography, geology and hydrology"]
[null,"Made ground (artificial ground)",null,null,null,null,null,null,null,"M","A medium environmental hazard rating has been selected for geology due to made ground exhibiting variable thickness. This is associated with the following:\n\n- Former sludge lagoons and storage tanks across the southern and western sections of the Northern Site and straddling the western boundary of the Southern Site;\n- Construction and dismantling of railway sidings, earthworks and associated infrastructure in the western section of the Northern Site; and\n- Presence of former water body (clarification lake) across the northern section of the Southern Site.","BGS","Made ground  (artificial deposit)  shown as per image.","http://mapapps2.bgs.ac.uk/geoindex/home.html",null,null,null,null,null,"Stantec (2020) Esholt Sewage Treatment\nWorks (STW) Ground Engineering Desk Study Report - p14","Artificial ground is shown across the western part of the Northern Site and straddles the existing ASP area. The artificial ground is described by the BGS (BGS, 2020) as Made Ground which consists of an area where pre-existing ground level has been raised by artificial deposits with variable composition. Artificial ground is shown to be absent from the Southern Site. \nHistorical mapping suggests significant and variable thicknesses of Made Ground are present at the site and are likely associated with the following:\n- Former sludge lagoons and storage tanks across the southern and western sections of the Northern Site and straddling the western boundary of the Southern Site;\n- Construction and dismantling of railway sidings, earthworks and associated infrastructure in the western section of the Northern Site; and\n- Presence of former water body (clarification lake) across the northern section of the Southern Site."]
[null,"Clay/Terrace gravels - Superficial deposits - Secondary A aquifer",null,null,null,null,null,null,null,"M","Superficial Deposits are shown to make up most of the site. Superficial deposits underlie the northern and southern sites and are generally aligned with the River Aire. Where superficial deposits are shown to be found, this is made up of alluvium, comprising of gravel, sand, silt and clay. This is also surrounded by river terrace deposits, comprising of sand and gravel, including glacial deposits comprised of devension and diamicton.","BGS","Alluvium - Gravel, Sand, Silt and Clay overly the site as per the image. River terrace deposits (undifferentiated) - sand and gravel. Site is also surrounded by hummocky (moundy) glacial deposits, devensian, diamicton. ","http://mapapps2.bgs.ac.uk/geoindex/home.html",null,null,null,null,null,"Stantec (2020) Esholt Sewage Treatment\nWorks (STW) Ground Engineering Desk Study Report - p14","Superficial deposits are shown to underlie the northern and Southern Sites and are shown across the general vicinity of the site and are generally aligned with the River Aire. The distribution of the superficial deposits is described below and include:\n•\tAlluvium;\n•\tRiver Terrace Deposits, and\n•\tGlacial Till.\nThe central and eastern sections of the Northern Site and central and western sections of the Southern Site are shown to be underlain by Alluvium, which is described by the BGS (BGS, 2020) as comprising soft to firm unconsolidated compressible silty clay with layers of silt, sand, peat and basal gravels, possibly with a stronger desiccated surface.\nRiver Terrace Deposits are shown across the western section of the Northern Site and eastern section of the Southern Site. River Terrace Deposits will likely be encountered underlying the Alluvium across the Northern and Southern Sites. River Terrace Deposits are described by the BGS (BGS, 2020) as comprising sand and gravel, locally with lenses of silt, clay and peat. Although not shown to underlie the site, Glacial Till is shown to the east of the Northern and Southern Sites and southwest of the Southern Site and is likely to be present at the sites, underlying the Alluvium and River Terrace Deposits. The BGS does not provide a description for Glacial Till, though the deposits typically consist of over consolidated stiff to very stiff sandy gravely clay with lenses of sand and gravel. Superficial deposits are shown to be absent to the west of the sites, in the location of the raised inlet works, primary settlement tanks and undeveloped land west of the Leeds and Liverpool Canal. A small area absent of superficial deposits is also shown immediately to the north of the Northern Site."]
[null,"Grit - Bedrock - Secondary A aquifer",null,null,null,null,null,null,null,"M","Bedrock in the site and surrounding areas have been described as Secondary A classification. Magic, and BGS describes the solid geology underlying the site as Millstone Grit (fine- to very coarse-grained feldspathic sandstones, interbedded with grey siltstones and mudstones, with subordinate marine shaly mudstone, claystone, coals and seatearths) and Guiseley Grit (coarse-grained, massively bedded sandstone, somewhat finer and flaggy in its lower part)","MAGIC Landscape Geology and Soils Aquifer Designation Map (Bedrock) (England) \n\n","Secondary A Classification as per image","https://magic.defra.gov.uk/MagicMap.aspx",null,"BGS","The Huddersfield White Rock: medium- to coarse-grained, massive to flaggy, cross-bedded, micaceous sandstone.\n\nMillstone Grit: Fine- to very coarse-grained feldspathic sandstones, interbedded with grey siltstones and mudstones, with subordinate marine shaly mudstone, claystone, coals and seatearths.\n\nGuiseley Grit: Coarse-grained, massively bedded sandstone, somewhat finer and flaggy in its lower part.","http://mapapps2.bgs.ac.uk/geoindex/home.html",null,"Stantec (2020) Esholt Sewage Treatment Works (STW) Ground Engineering Desk Study Report - p15","The central section of the Northern Site is shown to be underlain by the Millstone Grit Group, with the western and eastern sections of the site underlain by the Guiseley Grit. The Southern Site is underlain entirely by the Guiseley Grit. The published mapping shows the solid geology across the site and surrounding areas to be complex with numerous faults shown and folding evident, it is therefore not possible to assign dip/strike to the solid geology underlying the Northern and Southern Sites. For the purpose of this report it should be assumed that the dip/strike is variable across the site.\nThe BGS (BGS, 2020) describes the solid geology underlying the site as follows:\n Millstone Grit Group - fine to very coarse-grained sandstones, interbedded with grey siltstones, mudstones and subordinate marine shaly mudstone, clay, coals and seatearths.\n Guiseley Grit - coarse grained, massively bedded sandstone, fining towards the base. Several faults are shown on and in the general vicinity of the sites and are summarised below:\n Northwest to southeast striking fault straddling both the sites, with the downthrown side of the fault to the north.\n Northeast to southwest striking fault is shown immediately west of the Southern Site, with the downthrown side of the fault to the south.\n Northwest to southeast striking fault is shown immediately to the south of the Southern Site, with the downthrown side of the fault to the south."]
[null,"River Aire",null,null,null,null,null,null,null,"H","The River Aire runs adjacent to the eastern site boundary of the northern site and southwest boundary of the southern site, flowing in a southerly direction. This waterbody has an overall Water Framework Directive (WFD) classification of 'Moderate', with an ecological status of 'Moderate' and  a chemical status of 'Fail'.  There is potential for contaminants to be transported downstream.  Therefore, a High Environmental Hazard Rating has been selected.","Catchment Data Explorer","The water feature is currently 'Moderate' for ecology.  Priority hazardous substances (Polybrominated diphenyl ethers (PBDE) and Perfluorooctane sulphonate (PFOS)) mitigation measures assessment is the reason for the waterbody fails to meet 'Good' chemical status.","Environment Agency - CDE - Aire from Gill Beck (Baildon) to River Calder (data.gov.uk)",null,null,null,null,null,"Stantec (2020) Esholt Sewage Treatment Works (STW) Ground Engineering Desk Study Report - p34","The River Aire runs adjacent to the eastern site boundary of the Northern Site and southwest boundary of the Southern Site. This watercourse flows in a southernly direction. Guiseley Brook, a tributary to the River Aire, is shown to the northeast of the Northern Site in close proximity to Esholt Hall. \nThe Leeds and Liverpool Canal runs parallel to the western boundary of the Northern Site. A small basin attached to the Leeds and Liverpool Canal is located approximately 100 m north of the Northern Site. \nSeveral conduits (most likely culverted) are shown in the Southern Site and feed into the River Aire.\nTwo ponds are shown in the southern section of the Southern Site. A pond is located immediately to the north of the Southern Site."]
[null,"Gill Beck Guisley",null,null,null,null,null,null,null,"L","Gill Beck Guisley, a tributary to the River Aire, is shown to the northeast of the Northern Site in close proximity to Esholt Hall. This waterbody has an overall Water Framework Directive (WFD) classification of 'Moderate', with an ecological status of 'Moderate' and  a chemical status of 'Fail'.  There is potential for contaminants to be transported downstream to Aire from Gill Beck (Guisley).  Due to the distance to the STF, a Low Environmental Hazard Rating has been selected.","Catchment Data Explorer","Priority hazardous substances is the reason for the waterbody fails to meet 'Good' chemical status. The water feature is currently 'Moderate' for ecology.","Environment Agency - CDE - Gill Beck Guisley from Source to River Aire (data.gov.uk)",null,null,null,null,null,"Stantec (2020) Esholt Sewage Treatment Works (STW) Ground Engineering Desk Study Report - p34","The River Aire runs adjacent to the eastern site boundary of the Northern Site and southwest boundary of the Southern Site. This watercourse flows in a southernly direction. Guiseley Brook, a tributary to the River Aire, is shown to the northeast of the Northern Site in close proximity to Esholt Hall. \nThe Leeds and Liverpool Canal runs parallel to the western boundary of the Northern Site. A small basin attached to the Leeds and Liverpool Canal is located approximately 100 m north of the Northern Site. \nSeveral conduits (most likely culverted) are shown in the Southern Site and feed into the River Aire.\nTwo ponds are shown in the southern section of the Southern Site. A pond is located immediately to the north of the Southern Site."]
[null,"Leeds and Liverpool Canal ",null,null,null,null,null,null,null,"L","The Leeds and Liverpool Canal runs parallel but at a higher elevation to the western boundary of the Northern Site. A small basin attached to the Leeds and Liverpool Canal is located approximately 100 m north of the Northern Site. This waterbody has an overall Water Framework Directive (WFD) classification of 'Moderate', with an ecological status of 'good' and  a chemical status of 'Fail'.  There is potential for contaminants to be transported downstream. Due to the elevation, a Low Environmental Hazard Rating has been selected.","Catchment Data Explorer","Priority hazardous substances (Polybrominated diphenyl ethers (PBDE) and Mercury and Its Compounds) mitigation measures assessment is the reason for the waterbody fails to meet 'Good' chemical status","Environment Agency - CDE - Leeds and Liverpool Canal, summit to Leeds (data.gov.uk)",null,null,null,null,null,"Stantec (2020) Esholt Sewage Treatment Works (STW) Ground Engineering Desk Study Report - p34","The River Aire runs adjacent to the eastern site boundary of the Northern Site and southwest boundary of the Southern Site. This watercourse flows in a southernly direction. Guiseley Brook, a tributary to the River Aire, is shown to the northeast of the Northern Site in close proximity to Esholt Hall. \nThe Leeds and Liverpool Canal runs parallel to the western boundary of the Northern Site. A small basin attached to the Leeds and Liverpool Canal is located approximately 100 m north of the Northern Site. \nSeveral conduits (most likely culverted) are shown in the Southern Site and feed into the River Aire.\nTwo ponds are shown in the southern section of the Southern Site. A pond is located immediately to the north of the Southern Site."]
[]
[null,null,null,null,null,null,null,null,"Path & Mitigation Overall Rating","H","Justification:\n - There are geo-environmental barriers underlying the site such as made ground and clay. \n- A high rating has been given due to River Aire running through the middle of the two STF site areas and spill modelling (without mitigation) shows pathways to the River Aire\n\n "]
[null,"Climatic conditions"]
[null,"Annual rainfall < 1500 mm","1024mm",null,null,null,null,null,null,"L"," - The annual rainfall is less than 1,500 mm","Met  Office","UK climate averages","Bingley SAMOS (West Yorkshire) UK climate averages - Met Office"]
[null,"Fire Fighting Water"]
[null,"Flammable materials ",null,null,null,null,null,null,null,"L"," - There is limited flammable materials on the STF that would combust over long periods and required significant volumes of fire fighting water. \n - If firefighting was needed on the site the site drainage system returns surface water to treatment within the WwTW.\n - Fire water is therefore not  considered to be a pathway risk. "]
[null,"Location"]
[null,"Flooding",null,null,null,null,null,null,null,"M","The STW area is comprised of Flood Zones 1, 2 and 3, therefore a medium environmental hazard rating has been selected. ","EA Flood Map for Planning","The Esholt site is comprised of Flood zone 1, 2 and 3 and has a low probability of flooding.","https://flood-map-for-planning.service.gov.uk/summary?easting=433828&northing=431708",null,null,null,null,null,"Stantec (2020) Esholt Sewage Treatment Works (STW) Ground Engineering Desk Study Report - p34","Sporadic sections of the Northern and Southern Sites are shown to be at low (1000 year return) to high (30 year return) of surface water flooding.\n\nThe central and eastern sections of the Northern Site and majority of the Southern Site are indicated to be within a Flood Risk Zone 3 (flooding from river without defences) or Flood Risk. Zone 2 (extreme flooding from rivers without defences). A Flood Risk Zone 1 is shown in the northwest of the Northern Site and small sections of the Southern Site.\n\nA Flood Risk Zone 3 is land having a 1 in 100 (>1%) or greater annual probability of river flooding, with a Flood Risk Zone 2 having between a 1 in 100 and 1 in 1000 (1% - 0.1%) probability of river flooding. A Flood Risk Zone 1 has less than 1 in 1,000 (<0.1%) annual probability of flooding from rivers and the sea. The River Aire does not appear to benefit from\nflood defences."]
[null,"Site is connected to a Wastewater Treatment Works",null,null,null,null,null,null,null,"L"," - The WwTW is designed with capacity to treat peaks in flow and loads including from surface water drainage input from the site.  \n - In the event of a catastrophic failure on site the SCADA system would manage the Wastewater treatment process to contain any additional load within the system, where possible, or high level and treatment alarms would alert site operators or the Yorkshire Water central control room, who would start the emergency procedures in line with the site accident procedures in the site EMS and shut down/divert processes that risk the  WwTW discharge consent. \n - The potential risk of releases via the WwTW is considered to be low. \n"]
[null,"Topographic maps indicate that the site is relatively flat at the Northern and Southern site, however the  land of the west are shown to slope steeply.",null,null,null,null,null,null,null,"L","Ground level across the Northern Site ranges from approximately +64 m and +55 mOD (Free Map Tools, 2020), falling to the east.\nGround level across the Southern Site ranged from approximately +63 m and +55 mOD (Free Map Tools, 2020), falling to the west.\nThe land to the west of the site beyond the watercourses are shown to slope steeply upwards to around +100 mOD (Free Map Tools, 2020).","Elevation finder","The estimated elevation across the site is shown to be between 120m to 139m above sea level. ","https://www.freemaptools.com/elevation-finder.htm",null,null,null,null,null,"Stantec (2020) Esholt Sewage Treatment Works (STW) Ground Engineering Desk Study Report - p6","The Northern Site is occupied by a large, activated sludge process (ASP) area in the central, southern and eastern part of the site, and sludge and secondary sludge process areas in the northern and western part of the site. The Northern Site is bounded to the east / northeast by the River Aire, to the west / southwest by the Leeds and Liverpool Canal and to the north by a continuation of Esholt STW. Ground level across the Northern Site ranges from approximately +64 m and +55 mOD (Free Map Tools, 2020), falling to the east.\nThe Southern Site is connected to the Northern Site by overground pipelines crossing the River Aire. The Southern Site is occupied by several final settlement tanks and a tertiary treatment area in the in the north, humus tank in the west and sludge drying beds in the southeast and there are areas of landscaping across the site. The sludge drying beds in the  southeast appear to comprise an area of hummocky ground. Ground level across the Southern Site ranged from approximately +63 m and +55 mOD (Free Map Tools, 2020), falling\nto the west.\nLand in the surrounding area is described as follows:\n- North: Esholt STW continues north of the Northern Site and includes numerous tanks, process areas, buildings and hardstanding. Coronation Avenue is shown north of the Southern Site, with undeveloped land and the River Aire beyond. To the northeast of the River Aire, a large hall and estate (Esholt Hall) is shown surrounded by landscaping. Impounded sludge lagoons are shown to the northwest of the River Aire.\n- East: The Northern Site is bound to the east by the River Aire with undeveloped land beyond. Filter beds are shown approximately 30 m northeast of the Southern Site and Esholt Urban Quarry / disused pit approximately 25 m east. Several access roads in/out of Esholt STW are shown.\n- South: The River Aire and undeveloped land bounds the Northern Site to the south. Undeveloped land is shown immediately to the south of the Southern Site. An east to west aligned railway line is shown approximately 250 m to the south of the site.\n- West: The Leeds and Liverpool Canal bounds the Northern Site to the west, beyond which are several primary settlement tanks belonging to Esholt STW, with woodland beyond. The Southern Site is bound to the west by undeveloped land / River Aire, followed by the Leeds and Liverpool Canal with woodland and undeveloped land beyond. The land to the west of the site beyond the watercourses are shown to slope steeply upwards to around +100 mOD (Free Map Tools, 2020)."]
[null,null,null,null,null,null,null,null,"Site Considerations  Overall Rating","M","Given some of the STF site is in a Flood Zone 3, a medium hazard has been given."]
[]
[]
[null,null,null,null,null,null,null,null,"Pathway Overall Hazard Rating",{"$f":"IF(OR(J19=\"H\",J28=\"H\"),\"H\",IF(OR(J19=\"M\",J28=\"M\"),\"M\",\"L\"))","v":"H"}]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
["H"]
["M"]
["L"]

{"sheet":"1) c) Receptors","index":5,"n_rows":105,"n_cols":20,"rows_kept":105,"cut":false,"hidden":false,"merged":[]}
[]
[null,null,null,null,null,null,null,null,null,null,null,"Postcode","BD10 0TW"]
[]
[null,"Receptors","Within","units",null,null,null,null,null,"Environmental hazard rating ","Notes","Source","Description","Link","Image","Source","Description","Image","Source","Description"]
[null,"Watercourses and bodies"]
[null,"River Aire","<100","m",null,null,null,null,null,"H","The River Aire runs adjacent to the eastern site boundary of the Northern Site and southwest boundary of the Southern Site. This watercourse flows in a southernly direction. This river course is a habitat for  a number of  species. This waterbody has an overall Water Framework Directive (WFD) classification of 'Moderate', with an ecological status of 'Moderate' and  a chemical status of 'Fail'. \n",null,null,null,null,null,null,null,"Stantec (2020) Esholt Sewage Treatment Works (STW) Ground Engineering Desk Study Report - p34","The River Aire runs adjacent to the eastern site boundary of the Northern Site and southwest boundary of the Southern Site. This watercourse flows in a southernly direction. Guiseley Brook, a tributary to the River Aire, is shown to the northeast of the Northern Site in close proximity to Esholt Hall. \nThe Leeds and Liverpool Canal runs parallel to the western boundary of the Northern Site. A small basin attached to the Leeds and Liverpool Canal is located approximately 100 m north of the Northern Site. \nSeveral conduits (most likely culverted) are shown in the Southern Site and feed into the River Aire.\nTwo ponds are shown in the southern section of the Southern Site. A pond is located immediately to the north of the Southern Site."]
[null,"Gill Beck Guisley",125,"m",null,null,null,null,null,"H","Gill Beck Guisley, a tributary to the River Aire, is shown to the northeast of the Northern Site in close proximity to Esholt Hall. This waterbody has an overall Water Framework Directive (WFD) classification of 'Moderate', with an ecological status of 'Moderate' and  a chemical status of 'Fail'.  ",null,null,null,null,null,null,null,"Stantec (2020) Esholt Sewage Treatment Works (STW) Ground Engineering Desk Study Report - p34","The River Aire runs adjacent to the eastern site boundary of the Northern Site and southwest boundary of the Southern Site. This watercourse flows in a southernly direction. Guiseley Brook, a tributary to the River Aire, is shown to the northeast of the Northern Site in close proximity to Esholt Hall. \nThe Leeds and Liverpool Canal runs parallel to the western boundary of the Northern Site. A small basin attached to the Leeds and Liverpool Canal is located approximately 100 m north of the Northern Site. \nSeveral conduits (most likely culverted) are shown in the Southern Site and feed into the River Aire.\nTwo ponds are shown in the southern section of the Southern Site. A pond is located immediately to the north of the Southern Site."]
[null,"Leeds and Liverpool canal",100,"m",null,null,null,null,null,"H","The Leeds and Liverpool Canal runs parallel to the western boundary of the Northern Site. A small basin attached to the Leeds and Liverpool Canal is located approximately 100 m north of the Northern Site. This waterbody has an overall Water Framework Directive (WFD) classification of 'Moderate', with an ecological status of 'good' and  a chemical status of 'Fail'.  ",null,null,null,null,null,null,null,"Stantec (2020) Esholt Sewage Treatment Works (STW) Ground Engineering Desk Study Report - p34","The River Aire runs adjacent to the eastern site boundary of the Northern Site and southwest boundary of the Southern Site. This watercourse flows in a southernly direction. Guiseley Brook, a tributary to the River Aire, is shown to the northeast of the Northern Site in close proximity to Esholt Hall. \nThe Leeds and Liverpool Canal runs parallel to the western boundary of the Northern Site. A small basin attached to the Leeds and Liverpool Canal is located approximately 100 m north of the Northern Site. \nSeveral conduits (most likely culverted) are shown in the Southern Site and feed into the River Aire.\nTwo ponds are shown in the southern section of the Southern Site. A pond is located immediately to the north of the Southern Site."]
[null,"Clay/Terrace gravels - Superficial deposits - Secondary A aquifer","beneath site","m",null,null,null,null,null,"M","The superficial deposits of River Terrace Deposits are classified as a Secondary A Aquifer, therefore medium environmental hazard rating.  The site is not located within a groundwater Source Protection Zone (SPZ). ","BGS","Alluvium - Gravel, Sand, Silt and Clay overly the site as per the image. River terrace deposits (undifferentiated) - sand and gravel. Site is also surrounded by hummocky (moundy) glacial deposits, devensian, diamicton. ","http://mapapps2.bgs.ac.uk/geoindex/home.html",null,null,null,null,"Stantec (2020) Esholt Sewage Treatment\nWorks (STW) Ground Engineering Desk Study Report - p14","Superficial deposits are shown to underlie the northern and Southern Sites and are shown across the general vicinity of the site and are generally aligned with the River Aire. The distribution of the superficial deposits is described below and include:\n•\tAlluvium;\n•\tRiver Terrace Deposits, and\n•\tGlacial Till.\nThe central and eastern sections of the Northern Site and central and western sections of the Southern Site are shown to be underlain by Alluvium, which is described by the BGS (BGS, 2020) as comprising soft to firm unconsolidated compressible silty clay with layers of silt, sand, peat and basal gravels, possibly with a stronger desiccated surface.\nRiver Terrace Deposits are shown across the western section of the Northern Site and eastern section of the Southern Site. River Terrace Deposits will likely be encountered underlying the Alluvium across the Northern and Southern Sites. River Terrace Deposits are described by the BGS (BGS, 2020) as comprising sand and gravel, locally with lenses of silt, clay and peat.\nAlthough not shown to underlie the site, Glacial Till is shown to the east of the Northern and Southern Sites and southwest of the Southern Site and is likely to be present at the sites, underlying the Alluvium and River Terrace Deposits. The BGS does not provide a description for Glacial Till, though the deposits typically consist of over consolidated stiff to very stiff sandy gravely clay with lenses of sand and gravel.\nSuperficial deposits are shown to be absent to the west of the sites, in the location of the raised inlet works, primary settlement tanks and undeveloped land west of the Leeds and Liverpool Canal. A small area absent of superficial deposits is also shown immediately to the north of the Northern Site."]
[null,"Grit - Bedrock - Secondary A aquifer","beneath site","m",null,null,null,null,null,"M","Bedrock in the site and surrounding areas have been described as Secondary A classification by Magic, and BGS describes the solid geology underlying the site as Millstone Grit (fine- to very coarse-grained feldspathic sandstones, interbedded with grey siltstones and mudstones, with subordinate marine shaly mudstone, claystone, coals and seatearths) and Guiseley Grit (coarse-grained, massively bedded sandstone, somewhat finer and flaggy in its lower part)","MAGIC Landscape Geology and Soils Aquifer Designation Map (Bedrock) (England) \n\n","Secondary A Classification as per image","https://magic.defra.gov.uk/MagicMap.aspx",null,"BGS\nhttp://mapapps2.bgs.ac.uk/geoindex/home.html","The Huddersfield White Rock: medium- to coarse-grained, massive to flaggy, cross-bedded, micaceous sandstone.\n\nMillstone Grit: Fine- to very coarse-grained feldspathic sandstones, interbedded with grey siltstones and mudstones, with subordinate marine shaly mudstone, claystone, coals and seatearths.\n\nGuiseley Grit: Coarse-grained, massively bedded sandstone, somewhat finer and flaggy in its lower part.",null,"Stantec (2020) Esholt Sewage Treatment Works (STW) Ground Engineering Desk Study Report - p15","The central section of the Northern Site is shown to be underlain by the Millstone Grit Group, with the western and eastern sections of the site underlain by the Guiseley Grit. The Southern Site is underlain entirely by the Guiseley Grit. The published mapping shows the solid geology across the site and surrounding areas to be complex with numerous faults shown and folding evident, it is therefore not possible to assign dip/strike to the solid geology underlying the Northern and Southern Sites. For the purpose of this report it should be assumed that the dip/strike is variable across the site.\nThe BGS (BGS, 2020) describes the solid geology underlying the site as follows:\n Millstone Grit Group - fine to very coarse-grained sandstones, interbedded with grey siltstones, mudstones and subordinate marine shaly mudstone, clay, coals and seatearths.\n Guiseley Grit - coarse grained, massively bedded sandstone, fining towards the base. Several faults are shown on and in the general vicinity of the sites and are summarised below:\n Northwest to southeast striking fault straddling both the sites, with the downthrown side of the fault to the north.\n Northeast to southwest striking fault is shown immediately west of the Southern Site, with the downthrown side of the fault to the south.\n Northwest to southeast striking fault is shown immediately to the south of the Southern Site, with the downthrown side of the fault to the south."]
[null,"Groundwater Abstractions","beneath site","m",null,null,null,null,null,"M","Three groundwater source abstraction within approx. 1843 m of the STW site. With the closest being approx. 1394 m. Additionally, groundwater vulnerability is low to high.   Therefore a medium hazard rating is given.","MAGIC Source Protection Zones merged (England)\n\n","Three groundwater source abstraction within approx. 1843 m of the STW site. With the closest being approx. 1394 m.","https://magic.defra.gov.uk/MagicMap.aspx",null,"MAGIC Map","Groundwater vulnerability - medium to high",null,"Stantec (2020) Esholt Sewage Treatment Works (STW) Ground Engineering Desk Study Report - p33","Groundwater Vulnerability\nThe Envirocheck Report shows the Alluvium and River Terrace Deposits underlying the Northern Site and western section of the Southern Site to be highly vulnerable secondary aquifers. The eastern section of the Southern Site is shown to be a low vulnerability secondary aquifer.\nThe outcropping bedrock to the west and north of the Northern Site a shown to be a highly vulnerable secondary aquifer.\n\nGroundwater Abstractions\nThe Envirocheck Report indicates there are no recorded groundwater abstractions on the Northern or Southern Site and only one potentially active abstraction within the wider Esholt STW (500 m of the site), as follows:\n Yorkshire Water Services Ltd, licence number 2/27/16/196 (permit version 101) located approximately 175 m northwest of the Northern Site. The licence is indicated to be for a borehole within the Millstone Grit for water supply related to process water. Extraction rates are not provided. The permit start date is indicated"]
[null,"WwTWs",50,"m",null,null,null,null,null,"L","The WwTWs is a very large operation and is very unlikely to be affected by a sludge spill with the STF."]
[null,null,null,null,null,null,null,null,"Water Overall Rating","H","Justification: High Environmental Hazard Rating given due to water bodies and groundwater vulnerability"]
[null,"Habitation"]
[null,"Dense residential areas",1290,"m",null,null,null,null,null,"L","The nearest dense area of properties is located 1290 m from Esholt STW. Therefore, this is a low environment hazard.","Leeds City Council Planning Map","Dense residential properties located ~1290 m NE from site ","Map Search (leeds.gov.uk)"]
[null," Home Farm House and Home Farm Cottage",283,"m",null,null,null,null,null,"M","Home Farm House and Home Farm Cottage is situated approx.. ~283 m north east of the site","Google maps","North of site: Home Farm House and Home Farm Cottage  ~283 m NE"]
[null," Low Ash Farm",636,"m",null,null,null,null,null,"L"," Low Ash Farm  is situated approx.. ~636 m south west of the site","Google maps","West of site: Low Ash Farm =~636m SW"]
[null,"Esholt (settlement) ",673,"m",null,null,null,null,null,"L","Esholt settlement is situated approx. ~ 673m north west of the site","Google maps","Esholt (settlement) ~673m NW"]
[null,"Bottom Farm and Apperley Bridge Railway Station","455 + 433","m",null,null,null,null,null,"L","Bottom Farm and Apperley Bridge Railway Station is situated approx., 455m and 431m south and south east of the site respectively. ","Google maps","Bottom farm ~ 455m S\nApperley Bridge Railway station ~431m SSE"]
[null,"Nunwood House",null,null,null,null,null,null,null,"L","Nunwood House is situated approx. 444m south east of the site","Google maps","Nunwood House  ~444m ENE"]
[null,"Crow Trees House",null,null,null,null,null,null,null,"L","Crow Trees House is situated approx. 860m east, north east of the site","Google maps","Crow Trees House ~860m ENE"]
[null,"Office buildings",591,"m",null,null,null,null,null,"L","These office buildings are situated approximately 591 m from Esholt STW and therefore is a low risk.","Google maps","Office buildings ~ 591 SE"]
[null,"Agricultural ",460,"m",null,null,null,null,null,"L","This agricultural land is situated approximately 460 m from Esholt STW and therefore is a low risk.","Google maps","Agricultural ~460m SSW"]
[null,"Schools","785+","m",null,null,null,null,null,"L","13 schools are within 2.11 km of the Esholt STW, with the closed situated approx. 785m ESE of the site. ","Google maps"]
[null,"Bradford District Care Trust ",5040,"m",null,null,null,null,null,"L","Bradford District Care Trust  is situated approximately 5040 m from Esholt STW and therefore is a low risk.","Free Map Tools","Bradford District Care Trust is nearest hospital, 5.04 km to WSW of site","https://www.freemaptools.com/find-uk-hospitals-inside-radius.htm"]
[null,null,null,null,null,null,null,null,"Habitation Overall Rating","L","Justification: All habitation is greater than 250m  away from Esholt STW.  There are no reasonable circumstances under which sludge would travel this distance"]
[null,"Other"]
[null,"Yeadon Brickworks And Railway Cutting",1700,"m",null,null,null,null,null,"L","Yeadon Brickworks And Railway Cutting is a site  of Special Scientific Interest and is situated 1700 m from the site, therefore a low environmental risk.","Natural England","Yeadon Brickworks And Railway Cutting is located 1.7km NE ","http://designatedsites.naturalengland.org.uk/UnitDetail.aspx?UnitId=1013347"]
[null,"Tree Preservation Orders",900,"m",null,null,null,null,null,"L","The nearest Tree Preservation Order (PSO) is 900 m situated at the  South West of the site. Therefore this is a low environmental risk"," Tree Preservation Orders Map","Area of TPO' s are 900 m SW and 950m and NE of the site."]
[null,"Conservation areas",250,"m",null,null,null,null,null,"H","The nearest conservation area  is 250  m situated at the West of the site. Therefore this is a high environmental risk","Conservation area map","1. Esholt\n2. Leeds Liverpool Canal\n3. Little London\n\n(Note: Measured from centre point.  Distance to site boundary will be less.)","https://www.bradford.gov.uk/environment/conservation-areas/esholt-conservation-area/\n\nhttps://www.bradford.gov.uk/environment/conservation-areas/leeds-liverpool-canal-conservation-area/\n\nhttps://www.bradford.gov.uk/environment/conservation-areas/little-london-conservation-area/"]
[null,null,null,null,null,null,null,null,"Other Overall Rating","H","Justification: High rating  due to close proximities to the site"]
[]
[]
[null,null,null,null,null,null,null,null,"Receptors Overall Hazard Rating",{"$f":"IF(OR(J13=\"H\",J26=\"H\",J31=\"H\"),\"H\",IF(OR(J13=\"M\",J26=\"M\",J31=\"M\"),\"M\",\"L\"))","v":"H"}]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
["H"]
["M"]
["L"]

{"sheet":"2) Site Hazard Rating","index":6,"n_rows":106,"n_cols":5,"rows_kept":106,"cut":false,"hidden":false,"merged":[[12,1,12,3],[3,1,3,4]]}
[]
[]
[]
[null,"Calculated hazard ratings:"]
[null,"Source","Pathway","Receptor","Site Hazard Rating"]
[null,{"$f":"'1) a) Source'!J46","v":"H"},{"$f":"'1) b) Pathway'!J31","v":"H"},{"$f":"'1) c) Receptors'!J34","v":"H"},{"$f":"IF(E106<6,\"Low\",IF(E106<10,\"Medium\",\"High\"))","v":"High"}]
[]
[]
[]
[]
[]
[]
[null,"Possible Combination",null,null,"Site Hazard Rating"]
[null,"L","L","L","Low"]
[null,"M","M","L","Low"]
[null,"H","L","L","Low"]
[null,"M","M","M","Medium"]
[null,"H","M","L","Medium"]
[null,"H","H","L","Medium"]
[null,"H","M","M","High"]
[null,"H","H","M","High"]
[null,"H","H","H","High"]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[null,"Rating lookup table"]
[null,"L",1]
[null,"M",2]
[null,"H",3]
[]
[null,"This assesment score"]
[null,{"$f":"VLOOKUP(B6,B101:C103,2,FALSE)","v":3},{"$f":"VLOOKUP(C6,B101:C103,2,FALSE)","v":3},{"$f":"VLOOKUP(D6,B101:C103,2,FALSE)","v":3},{"$f":"B106*C106*D106","v":27}]

{"sheet":"3) Likelihood","index":7,"n_rows":326,"n_cols":25,"rows_kept":326,"cut":false,"hidden":false,"merged":[[64,1,76,1],[64,3,76,3],[64,4,76,4],[64,5,76,5],[90,1,103,1],[90,3,103,3],[90,4,103,4],[90,5,103,5],[77,1,89,1],[77,3,89,3],[77,4,89,4],[77,5,89,5],[300,1,312,1],[300,3,312,3],[300,4,312,4],[287,5,299,5],[313,1,325,1],[313,3,325,3],[313,4,325,4],[300,5,312,5],[313,5,325,5],[261,5,273,5],[274,5,286,5],[287,1,299,1],[287,3,299,3],[287,4,299,4],[261,1,273,1],[261,3,273,3],[261,4,273,4],[274,1,286,1],[274,3,286,3],[274,4,286,4],[222,5,234,5],[235,5,248,5],[249,5,260,5],[208,1,221,1],[208,3,221,3],[208,4,221,4],[249,1,260,1],[249,3,260,3],[249,4,260,4],[222,1,234,1],[222,3,234,3],[222,4,234,4],[235,1,248,1],[235,3,248,3],[235,4,248,4],[183,1,194,1],[183,3,194,3],[183,4,194,4],[195,1,207,1],[195,3,207,3],[195,4,207,4],[156,1,169,1],[156,3,169,3],[156,4,169,4],[170,1,182,1],[170,3,182,3],[170,4,182,4],[143,3,155,3],[143,4,155,4],[131,5,142,5],[131,1,142,1],[131,3,142,3],[131,4,142,4],[11,1,23,1],[11,3,23,3],[11,4,23,4],[11,5,23,5],[24,1,36,1],[24,3,36,3],[24,4,36,4],[24,5,36,5],[37,1,49,1],[37,3,49,3],[37,4,49,4],[37,5,49,5],[183,5,194,5],[50,1,63,1],[50,3,63,3],[50,4,63,4],[104,1,116,1],[104,3,116,3],[104,4,116,4],[117,1,130,1],[117,3,130,3],[117,4,130,4],[117,5,130,5],[143,1,155,1],[195,5,207,5],[208,5,221,5],[50,5,63,5],[104,5,116,5],[143,5,155,5],[156,5,169,5],[170,5,182,5]]}
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[null,"Risk #","Description of Risk","UNMITIGATED LIKELIHOOD \n","Mitigation applied","MITIGATED LIKELIHOOD","Low","Site Overall Likelihood"]
[null,"Sludge Import Screen Tank\n","Containment:\n - Concrete construction. Constructed in 2013 with a 60yr asset life. \n - High level alarms linked to site SCADA control program and interlock to stop pumping into the tanks if high level reached. \n- High level alarms linked to site SCADA control program and activate alarm at tanker off-loading point\n - The tank is covered and includes a vent to atmosphere to prevent damage to the tank walls and roof during tanker unloading operations. \n- The tank is surrounded by impermeable hardstanding which drains to the liquors return pumping station which would return spills for treatment\n","M"," - Tanks visually inspected weekly. \n - TCM checks are conducted regularly, including weekly visual inspection. \n - Site is manned 7 days per week for 12 hours per day.\n - Dependant on the age of the asset non destructive testing (NDT) is carried out every 10, 5, 2 years and yearly on all tanks and associated ancillary assets. The risk of catastrophic failure will therefore be identified before failure occurs. \n - Daily site task instruction ensures the areas of the site are inspected for any environmental or process risks. \n - The EMS contains procedures for tank failures.\n - Minor to moderate spills will be cleaned up before there has been sufficient time for infiltration into the ground.\n","L"]
[null,null,"Failure risk:"]
[null,null," - Catastrophic tank failure - The tank is relatively new and has been designed and constructed according to relevant YW technical standards.  YW have never experienced catastrophic failure of steel tanks built to these standards.  Based on the CIRIA risk criteria for steel tanks, the potential is therefore considered medium."]
[null,null," - Tank overflow or leaks - Due to level monitors and the interlock on pumps feeding sludge, the risk of overflow is low. ",null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,"High"]
[null,null,"- Potential for minor leakage around pipe flanges, where they enter and exit the tank, however these would be contained by the impermeable surfacing and drainage. Emission due to overflow or leaks is therefore considered low.",null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,"Medium"]
[null,null,"-Shortcomings or failure in operational control system: the site is maintained inline with a proactive maintenance schedule and the EMS to ensure ongoing operation of all plant items. Operators are trained in the running of plant items. Likelihood of emissions due to operational failure is medium",null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,"Low"]
[null,null,"- Abuse - All site staff and tanker operators are trained to operate the import tank. HAZOP studies have been undertaken as part of the design process. No risk of overflow, due to level monitors and the interlock on feed pumps. Likelihood of emissions due to Abuse is low"]
[null,null,"- Impact - the tank is at a safe distance away from the tanker loading point and the site road. Likelihood of emissions due to impacts low"]
[null,null,"- Vandalism, etc. -the STF and WwTW are within a fenced and gated site, with access to the site control by security.  Likelihood of emissions due to Vandalism is medium"]
[null,null,"- Fire, explosion - the tank is covered and vented for odour control. The risk of flammable gasses building in the headspace is low. Likelihood of emissions due to Fire or explosion is medium"]
[null,null,"- Geological factors - There has been no evidence of wider geotechnical issues during the time the WwTW has been operational on the site.  the tank was designed with geotechnical design input.  Likelihood of emissions due to Geological issues is low"]
[null,null,"- Ageing - Tank constructed in 2013 with an asset life of 60 years. Likelihood of emissions due to age in low"]
[null,null,"- Lightning strike -  This is a low tank with other significantly taller structures within the vicinity.  Likelihood of emissions due to lightning is low"]
[null,"Consolidation Tank 5\n","Containment:\n - Open concrete construction. Constructed in 2007 with a 60yr asset life. \n - High level alarms linked to site SCADA control program and interlock to stop pumping into the tanks if high level reached. \n- High level alarms linked to site SCADA control program and activate alarm at tanker off-loading point\n - The tank is uncovered, this means there is no risk of vacuum damage to the tank walls during tanker unloading operations. \n- The tank is surrounded by impermeable hardstanding which drains to the liquors return pumping station which would return spills for treatment.\n","M"," - Tanks visually inspected weekly. \n - TCM checks are conducted regularly, including weekly visual inspection. \n - Site is manned 7 days per week for 12 hours per day.\n - Dependant on the age of the asset non destructive testing (NDT) is carried out every 10, 5, 2 years and yearly on all tanks and associated ancillary assets. The risk of catastrophic failure will therefore be identified before failure occurs. \n - Daily site task instruction ensures the areas of the site are inspected for any environmental or process risks. \n - The EMS contains procedures for tank failures.\n - Minor to moderate spills will be cleaned up before there has been sufficient time for infiltration into the ground.\n","L"]
[null,null,"Failure risk:"]
[null,null," - Catastrophic tank failure - The tank is relatively new and has been designed and constructed according to relevant YW technical standards.  YW have never experienced catastrophic failure of concrete tanks built to these standards.  Based on the CIRIA risk criteria for steel tanks, the potential is therefore considered medium."]
[null,null," - Tank overflow or leaks - Due to level monitors and the interlock on pumps feeding sludge, the risk of overflow is low. "]
[null,null,"- Potential for minor leakage around pipe flanges, where they enter and exit the tank, however these would be contained by the impermeable surfacing and drainage. Emission due to overflow or leaks is therefore considered low."]
[null,null,"-Shortcomings or failure in operational control system: the site is maintained inline with a proactive maintenance schedule and the EMS to ensure ongoing operation of all plant items. Operators are trained in the running of plant items. Likelihood of emissions due to operational failure is medium"]
[null,null,"- Abuse - HAZOP studies have been undertaken as part of the design process. No risk of overflow, due to level monitors and the interlock on feed pumps. Likelihood of emissions due to Abuse is low"]
[null,null,"- Impact - the tank is at a safe distance away from the  site road. Likelihood of emissions due to impacts low"]
[null,null,"- Vandalism, etc. -the STF and WwTW are within a fenced and gated site, with access to the site control by security.  Likelihood of emissions due to Vandalism is medium"]
[null,null,"- Fire, explosion - the tank is uncovered and vented for odour control. The risk of flammable gasses building in the headspace is low. Likelihood of emissions due to Fire or explosion is low"]
[null,null,"- Geological factors - There has been no evidence of wider geotechnical issues during the time the WwTW has been operational on the site.  the tank was designed with geotechnical design input.  Likelihood of emissions due to Geological issues is low"]
[null,null,"- Ageing - Tank constructed in 2007 with an asset life of 60 years. Likelihood of emissions due to age in low"]
[null,null,"- Lightning strike -  This is a low tank with other significantly taller structures within the vicinity.  Likelihood of emissions due to lightning is low"]
[null,"Mixed Sludge Tanks\n","Containment:\n - Concrete construction. Constructed in 2013 with a 60yr asset life. \n - High level alarms linked to site SCADA control program and interlock to stop pumping into the tanks if high level reached. \n- High level alarms linked to site SCADA control program and activate alarm at tanker off-loading point\n - The tank is covered and includes a vent to atmosphere to prevent damage to the tank walls and roof during tanker unloading operations. \n- The tank is surrounded by impermeable hardstanding which drains to the liquors return pumping station which would return spills for treatment\n","M"," - Tanks visually inspected weekly. \n - TCM checks are conducted regularly, including weekly visual inspection. \n - Site is manned 7 days per week for 12 hours per day.\n - Dependant on the age of the asset non destructive testing (NDT) is carried out every 10, 5, 2 years and yearly on all tanks and associated ancillary assets. The risk of catastrophic failure will therefore be identified before failure occurs. \n - Daily site task instruction ensures the areas of the site are inspected for any environmental or process risks. \n - The EMS contains procedures for tank failures.\n","L"]
[null,null,"Failure risk:"]
[null,null," - Catastrophic tank failure - The tank is relatively new and has been designed and constructed according to relevant YW technical standards.  YW have never experienced catastrophic failure of steel tanks built to these standards.  Based on the CIRIA risk criteria for steel tanks, the potential is therefore considered medium."]
[null,null," - Tank overflow or leaks - Due to level monitors and the interlock on pumps feeding sludge, the risk of overflow is low. "]
[null,null,"- Potential for minor leakage around pipe flanges, where they enter and exit the tank, however these would be contained by the impermeable surfacing and drainage. Emission due to overflow or leaks is therefore considered low."]
[null,null,"-Shortcomings or failure in operational control system: the site is maintained inline with a proactive maintenance schedule and the EMS to ensure ongoing operation of all plant items. Operators are trained in the running of plant items. Likelihood of emissions due to operational failure is medium"]
[null,null,"- Abuse - All site staff and tanker operators are trained to operate the import tank. HAZOP studies have been undertaken as part of the design process. No risk of overflow, due to level monitors and the interlock on feed pumps. Likelihood of emissions due to Abuse is low"]
[null,null,"- Impact - the tank is at a safe distance away from the tanker loading point and the site road. Likelihood of emissions due to impacts low"]
[null,null,"- Vandalism, etc. -the STF and WwTW are within a fenced and gated site, with access to the site control by security.  Likelihood of emissions due to Vandalism is medium"]
[null,null,"- Fire, explosion - the tank is covered and vented for odour control. The risk of flammable gasses building in the headspace is low. Likelihood of emissions due to Fire or explosion is medium"]
[null,null,"- Geological factors - There has been no evidence of wider geotechnical issues during the time the WwTW has been operational on the site.  the tank was designed with geotechnical design input.  Likelihood of emissions due to Geological issues is low"]
[null,null,"- Ageing - Tank constructed in 2013 with an asset life of 60 years. Likelihood of emissions due to age in low"]
[null,null,"- Lightning strike -  This is a low tank with other significantly taller structures within the vicinity.  Likelihood of emissions due to lightning is low"]
[null,"Pipework associated with the sludge import, mixed tanks and sludge screens\n\n - Spillage of non hazardous sludge: catastrophic failure and leaks from pipework.","Containment: \n- All pipelines, valves and screens are made from steel and single-skinned\n- Sludge screens are on impermeable surfacing that falls to the site drainage\n- Screened sludge below ground pump station is constructed of concrete and the above transfer tank are surrounded by hardstanding that drains into site drainage system.\n- Isolation valves are present at each end of pipe sections. This allows the isolation of leaking or failed pipe sections and limits the volume released.","M"," - Pipework visually inspected weekly. \n - Pipework is lagged to prevent freezing\n - TCM checks are conducted regularly, including weekly visual inspection. \n - Site is manned 7 days per week for 12 hours per day.\n - Non Destructive Testing is carried out every 10 years on all ancillary assets. \n - Daily site task instruction ensures the areas of the site are inspected for any environmental or process risks. \n - The EMS contains procedures for pipework failures.\n - Minor to moderate spills will be cleaned up before there has been sufficient time for infiltration into the ground. \n - Potential for leaking from the pipework will be tested using appropriate tools on a regular basis","L"]
[null,null,"Failure risk:"]
[null,null," - Catastrophic pipe failure - Following pressure testing the potential for catastrophic failure is considered medium."]
[null,null," - Leaks from over ground pipework -  Following pressure testing and with regular checking for leakage it is therefore considered that there is a low likelihood of significant leakage. Any leaks would be contained by the site drainage. The potential for emission is therefore considered low.  "]
[null,null," - Leaks from underground pipework would be emitted to ground.  Underground pipework is designed and maintained to Yorkshire Water specifications, this includes regular internal inspection. The risk of emission due to leaks is therefore considered to be medium. "]
[null,null,"- Catastrophic failure of pipe joints and flanges, particularly downstream of the sludge screen transfer pumps - Any sudden loss of pressure related to a catastrophic pipe failure would be identified by the site SCADA system resulting all pumping being stopped and an alarm on the site SCADA system, therefore reducing any emissions. Likelihood of emissions due to catastrophic pipe failure is considered medium. "]
[null,null,"- Shortcomings or failure in operational control system: The site is maintained inline with a proactive maintenance schedule and the EMS to ensure ongoing operation of all plant items. Operators are trained in the running of plant items. Possibility of overfilling of sludge screen housing or screened sludge Pump station and Transfer Tank. Likelihood of emissions due to operational failure is medium."]
[null,null,"- Abuse - All site staff and tanker operators are trained to operate the import tank and associated pipework. HAZOP studies have been undertaken as part of the design process. No risk of overflow, due to level monitors and the interlock on feed pumps. Likelihood of emissions due to abuse is low "]
[null,null,"- Impact -  The pipework is protected by bollards between the tank and site road.  Likelihood of emissions due to impacts low"]
[null,null,"- Vandalism, etc. - the pipework is within the fenced and gated site, monitored via security surveillance.  Likelihood of emissions due to Vandalism is medium"]
[null,null,"- Fire, explosion - the pipework is not routed along areas of Potential flammable atmosphere. The headroom in the screen units are vented to an odour control unit removing any potential for build up of flammable atmosphere. Likelihood of emissions due to Fire or explosion is medium"]
[null,null,"- Geological factors - There has been no evidence of wider geotechnical issues during the time the WwTW has been operational on the site. The tank was designed with geotechnical design input.  Likelihood of emissions due to Geological issues is low"]
[null,null,"- Ageing - The pipework was installed in 2013 with an asset life of 30 years. They are regularly monitored to check for leakages and material failure. Likelihood of emissions due to age in low"]
[null,null,"- Lightning strike - the pipework is low relative to other structures within the area therefore unlikely to be struck by lightning.  Likelihood of emissions due to Lightning is low"]
[null,"Un-thickened SAS transfer tank\n","Containment:\n - Concrete construction. Constructed in 2007 with a 60yr asset life. \n - High level alarms linked to site SCADA control program and interlock to stop pumping into the tanks if high level reached. \n- High level alarms linked to site SCADA control program and activate alarm at tanker off-loading point\n - The tank is surrounded by impermeable hardstanding roads which drains to the liquors return pumping station which would return spills for treatment\n","M"," - Tanks visually inspected weekly. \n - TCM checks are conducted regularly, including weekly visual inspection. \n - Site is manned 7 days per week for 12 hours per day.\n - Dependant on the age of the asset non destructive testing (NDT) is carried out every 10, 5, 2 years and yearly on all tanks and associated ancillary assets. The risk of catastrophic failure will therefore be identified before failure occurs. \n - Daily site task instruction ensures the areas of the site are inspected for any environmental or process risks. \n - The EMS contains procedures for tank failures.\n","L"]
[null,null,"Failure risk:"]
[null,null," - Catastrophic tank failure - The tank has been designed and constructed according to relevant YW technical standards.  YW have never experienced catastrophic failure of steel tanks built to these standards.  Based on the CIRIA risk criteria for steel tanks, the potential is therefore considered medium."]
[null,null," - Tank overflow or leaks - Due to level monitors and the interlock on pumps feeding sludge, the risk of overflow is low. "]
[null,null,"- Potential for minor leakage around pipe flanges, where they enter and exit the tank, however these would be contained by the impermeable surfacing and drainage. Emission due to overflow or leaks is therefore considered low."]
[null,null,"-Shortcomings or failure in operational control system: the site is maintained inline with a proactive maintenance schedule and the EMS to ensure ongoing operation of all plant items. Operators are trained in the running of plant items. Likelihood of emissions due to operational failure is medium"]
[null,null,"- Abuse - All site staff and tanker operators are trained to operate the import tank. HAZOP studies have been undertaken as part of the design process. No risk of overflow, due to level monitors and the interlock on feed pumps. Likelihood of emissions due to Abuse is low"]
[null,null,"- Impact - the tank is at a safe distance away from the site road. Likelihood of emissions due to impacts low"]
[null,null,"- Vandalism, etc. -the STF and WwTW are within a fenced and gated site, with access to the site control by security.  Likelihood of emissions due to Vandalism is medium"]
[null,null,"- Fire, explosion - The tank is uncovered. The risk of flammable gasses building in the headspace is low. Likelihood of emissions due to Fire or explosion is low"]
[null,null,"- Geological factors - There has been no evidence of wider geotechnical issues during the time the WwTW has been operational on the site.  the tank was designed with geotechnical design input.  Likelihood of emissions due to Geological issues is low"]
[null,null,"- Ageing - Tank constructed in 2007 with an asset life of 60 years. Likelihood of emissions due to age in low"]
[null,null,"- Lightning strike -  This is a low tank with other significantly taller structures within the vicinity.  Likelihood of emissions due to lightning is low"]
[null,"Thickened SAS transfer tank\n","Containment:\n - Concrete construction. Constructed in 2007 with a 60yr asset life. \n - High level alarms linked to site SCADA control program and interlock to stop pumping into the tanks if high level reached. \n- High level alarms linked to site SCADA control program and activate alarm at tanker off-loading point\n - The tank is surrounded by impermeable hardstanding roads which drains to the liquors return pumping station which would return spills for treatment\n","M"," - Tanks visually inspected weekly. \n - TCM checks are conducted regularly, including weekly visual inspection. \n - Site is manned 7 days per week for 12 hours per day.\n - Dependant on the age of the asset non destructive testing (NDT) is carried out every 10, 5, 2 years and yearly on all tanks and associated ancillary assets. The risk of catastrophic failure will therefore be identified before failure occurs. \n - Daily site task instruction ensures the areas of the site are inspected for any environmental or process risks. \n - The EMS contains procedures for tank failures.\n","L"]
[null,null,"Failure risk:"]
[null,null," - Catastrophic tank failure - The tank has been designed and constructed according to relevant YW technical standards.  YW have never experienced catastrophic failure of steel tanks built to these standards.  Based on the CIRIA risk criteria for steel tanks, the potential is therefore considered medium."]
[null,null," - Tank overflow or leaks - Due to level monitors and the interlock on pumps feeding sludge, the risk of overflow is low. "]
[null,null,"- Potential for minor leakage around pipe flanges, where they enter and exit the tank, however these would be contained by the impermeable surfacing and drainage. Emission due to overflow or leaks is therefore considered low."]
[null,null,"-Shortcomings or failure in operational control system: the site is maintained inline with a proactive maintenance schedule and the EMS to ensure ongoing operation of all plant items. Operators are trained in the running of plant items. Likelihood of emissions due to operational failure is medium"]
[null,null,"- Abuse - All site staff and tanker operators are trained to operate the import tank. HAZOP studies have been undertaken as part of the design process. No risk of overflow, due to level monitors and the interlock on feed pumps. Likelihood of emissions due to Abuse is low"]
[null,null,"- Impact - the tank is at a safe distance away from the site road. Likelihood of emissions due to impacts low"]
[null,null,"- Vandalism, etc. -the STF and WwTW are within a fenced and gated site, with access to the site control by security.  Likelihood of emissions due to Vandalism is medium"]
[null,null,"- Fire, explosion - The tank is uncovered. The risk of flammable gasses building in the headspace is low. Likelihood of emissions due to Fire or explosion is low"]
[null,null,"- Geological factors - There has been no evidence of wider geotechnical issues during the time the WwTW has been operational on the site.  the tank was designed with geotechnical design input.  Likelihood of emissions due to Geological issues is low"]
[null,null,"- Ageing - Tank constructed in 2007 with an asset life of 60 years. Likelihood of emissions due to age in low"]
[null,null,"- Lightning strike -  This is a low tank with other significantly taller structures within the vicinity.  Likelihood of emissions due to lightning is low"]
[null,"Pipework associated with the SAS tanks\n\n - Spillage of non hazardous sludge: catastrophic failure and leaks from pipework.","Containment: \n- All pipelines, valves and screens are made from steel and single-skinned\n- Sludge screens are on impermeable surfacing that falls to the site drainage\n- Screened sludge below ground pump station is constructed of concrete and the above transfer tank are surrounded by hardstanding that drains into site drainage system.\n- Isolation valves are present at each end of pipe sections. This allows the isolation of leaking or failed pipe sections and limits the volume released.","M"," - Pipework visually inspected weekly. \n - Pipework is lagged to prevent freezing\n - TCM checks are conducted regularly, including weekly visual inspection. \n - Site is manned 7 days per week for 12 hours per day.\n - Non Destructive Testing is carried out every 10 years on all ancillary assets. \n - Daily site task instruction ensures the areas of the site are inspected for any environmental or process risks. \n - The EMS contains procedures for pipework failures.\n - Minor to moderate spills will be cleaned up before there has been sufficient time for infiltration into the ground. \n - Potential for leaking from the pipework will be tested using appropriate tools on a regular basis","L"]
[null,null,"Failure risk:"]
[null,null," - Catastrophic pipe failure - Following pressure testing the potential for catastrophic failure is considered medium."]
[null,null," - Leaks from over ground pipework -  Following pressure testing and with regular checking for leakage it is therefore considered that there is a low likelihood of significant leakage. Any leaks would be contained by the site drainage. The potential for emission is therefore considered low.  "]
[null,null," - Leaks from underground pipework would be emitted to ground.  Underground pipework is designed and maintained to Yorkshire Water specifications, this includes regular internal inspection. The risk of emission due to leaks is therefore considered to be medium. "]
[null,null,"- Catastrophic failure of pipe joints and flanges, particularly downstream of the sludge screen transfer pumps - Any sudden loss of pressure related to a catastrophic pipe failure would be identified by the site SCADA system resulting all pumping being stopped and an alarm on the site SCADA system, therefore reducing any emissions. Likelihood of emissions due to catastrophic pipe failure is considered medium. "]
[null,null,"- Shortcomings or failure in operational control system: The site is maintained inline with a proactive maintenance schedule and the EMS to ensure ongoing operation of all plant items. Operators are trained in the running of plant items. Possibility of overfilling of sludge screen housing or screened sludge Pump station and Transfer Tank. Likelihood of emissions due to operational failure is medium."]
[null,null,"- Abuse - All site staff and tanker operators are trained to operate the import tank and associated pipework. HAZOP studies have been undertaken as part of the design process. No risk of overflow, due to level monitors and the interlock on feed pumps. Likelihood of emissions due to abuse is low "]
[null,null,"- Impact -  The pipework is protected by bollards between the tank and site road.  Likelihood of emissions due to impacts low"]
[null,null,"- Vandalism, etc. - the pipework is within the fenced and gated site, monitored via security surveillance.  Likelihood of emissions due to Vandalism is medium"]
[null,null,"- Fire, explosion - the pipework is not routed along areas of Potential flammable atmosphere. The headroom in the screen units are vented to an odour control unit removing any potential for build up of flammable atmosphere. Likelihood of emissions due to Fire or explosion is medium"]
[null,null,"- Geological factors - There has been no evidence of wider geotechnical issues during the time the WwTW has been operational on the site. The tank was designed with geotechnical design input.  Likelihood of emissions due to Geological issues is low"]
[null,null,"- Ageing - The pipework was installed in 2013 with an asset life of 30 years. They are regularly monitored to check for leakages and material failure. Likelihood of emissions due to age in low"]
[null,null,"- Lightning strike - the pipework is low relative to other structures within the area therefore unlikely to be struck by lightning.  Likelihood of emissions due to Lightning is low"]
[null,"Cake Reception System\n\n\nSpillage of non hazardous sludge: \n - catastrophic failure of tank\n - tank overflow or\n - tank leaks.","Containment:\n - Steel construction. Constructed in 2013 with a 20yr asset life. \n","M"," - Tanks visually inspected weekly. \n - TCM checks are conducted regularly and visually inspected weekly. \n - Site is manned 7 days per week for 12 hours per day.\n- Dependant on the age of the asset non destructive testing (NDT) is carried out every 10, 5, 2 years and yearly on all tanks and associated ancillary assets. The risk of catastrophic failure will therefore be identified before failure occurs.\n - Daily site task instruction ensures the areas of the site are inspected for any environmental or process risks. \n - The EMS contains procedures for tank failures.\n - Minor to moderate spills will be cleaned up before there has been sufficient time for infiltration into the ground.\n","L"]
[null,null,"Failure risk:"]
[null,null," - Catastrophic tank failure - The tank is relatively new and has been designed and constructed according to relevant YW technical standards.  YW have never experienced catastrophic failure of steel tanks built to these standards.  Based on the CIRIA risk criteria for steel tanks, the potential is therefore considered medium."]
[null,null," - Tank overflow or leaks - The sludge cake imports will only be allowed to discharge into the reception unit if there is enough capacity using the traffic light / vehicle control system.. The risk of overflow is low.  "]
[null,null,"- Potential for minor leakage around pipe flanges, where they enter and exit the tank, however these would be contained by the impermeable surfacing and drainage. Physical property of sludge is slow flowing and relatively immobile. Emission due to overflow or leaks is therefore considered low."]
[null,null,"-Shortcomings or failure in operational control system: the site is maintained inline with a proactive maintenance schedule and the EMS to ensure ongoing operation of all plant items. Operators are trained in the running of plant items.  Tanker driver will be operating in a safe manner to prevent damage leading to loss of containment.  Audible and visual alarms will alert staff to take appropriate action. Likelihood of emissions due to operational failure is medium"]
[null,null,"- Abuse -all site staff and tanker operators are trained to operate the facility using the WaSP unit. HAZOP studies have been undertaken as part of the design process.  No risk of overflow. Likelihood of emissions due to Abuse is low"]
[null,null,"- Impact - The reception unit is protected by Armco barrier during tanker unloading. A traffic light provides indication when it is safe to start unloading procedures. Likelihood of emissions due to impacts low"]
[null,null,"- Vandalism, etc. -the STF and WwTW are within a fenced and gated site, with access to the site control by security.  Likelihood of emissions due to Vandalism is medium"]
[null,null,"- Fire, explosion - The reception unit has been designed with a forced ventilation system (duty/stand by ventilation fans) to remove any potential for flammable atmosphere. A hazardous area assessment has been conducted. Likelihood of emissions due to Fire or explosion is medium"]
[null,null,"- Geological factors - There has been no evidence of wider geotechnical issues during the time the WwTW has been operational on the site.  the tank was designed with geotechnical design input.  Likelihood of emissions due to Geological issues is low"]
[null,null,"- Ageing - Reception unit is constructed in 2013 with an asset life of 20 years. Likelihood of emissions due to age in low"]
[null,null,"- Lightning strike - the plant items are low relative to other structures within the vicinity are therefore unlikely to be struck by lightning.  Likelihood of emissions due to Lightning is low"]
[null,"Pipework associated cake reception, rewetting and transfer systems\n\n - Spillage of non hazardous sludge: catastrophic failure and leaks from pipework.","Containment: \n- All pipelines, valves and screen are made from steel and single-skinned\n- Sludge screen feed pipe and screened sludge pipe are above ground and over impermeable surfacing that falls to the site drainage\n- Rewetted sludge pipework is partially below ground where it crosses the site road, upstream of the macerator\n- Isolation valves are present at each end of pipe sections. This allows the isolation of leaking or failed pipe sections and limits the volume released.","M"," - Pipework visually inspected weekly. \n - Pipework is lagged to prevent freezing\n - TCM checks are conducted regularly, including weekly visual inspection. \n - Site is manned 7 days per week for 12 hours per day.\n - Non Destructive Testing is carried out every 10 years on all ancillary assets. \n - Daily site task instruction ensures the areas of the site are inspected for any environmental or process risks. \n - The EMS contains procedures for pipework failures.\n - Minor to moderate spills will be cleaned up before there has been sufficient time for infiltration into the ground. \n - Potential for leaking from the pipework will be tested using a Water industry standard drop test, to monitor for the risk of containment failure so this can be mitigated. ","L"]
[null,null,"Failure risk:"]
[null,null," - Catastrophic pipe failure - Following pressure testing the potential for catastrophic failure is considered low."]
[null,null," - Leaks from over ground pipework -  Following pressure testing and with regular checking for leakage it is therefore considered that there is a low likelihood of significant leakage. Any leaks would be contained by the site drainage. Pipework is lagged and heat-traced to minimise any risk of pipe freezing. The potential for emission is therefore considered low.  "]
[null,null," - Leaks from underground pipework would be emitted to ground.  Underground pipework is designed and maintained to Yorkshire Water specifications, this includes regular internal inspection. The risk of emission due to leaks is therefore considered to be medium. "]
[null,null,"- Catastrophic failure of pipe joints and flanges, particularly downstream of the pumps - Any sudden loss of pressure related to a catastrophic pipe failure would be identified by the site SCADA system resulting all pumping being stopped and an alarm on the site SCADA system, therefore reducing any emissions. Likelihood of emissions due to catastrophic pipe failure is considered medium. "]
[null,null,"-Shortcomings or failure in operational control system: the site is maintained inline with a proactive maintenance schedule and the EMS to ensure ongoing operation of all plant items. Operators are trained in the running of plant items. Likelihood of emissions due to operational failure is medium"]
[null,null,"- Abuse - All site staff and tanker operators are trained to operate the plant items. HAZOP studies have been undertaken as part of the design process. No risk of loss of containment due to abuse. Likelihood of emissions due to Abuse is low"]
[null,null,"- Impact -  The pipework is routed below ground as it approaches the site road, eliminating the risk of vehicular impact .  Likelihood of emissions due to impacts low"]
[null,null,"- Vandalism, etc. - the pipework is within the fenced and gated site, monitored via security surveillance.  Likelihood of emissions due to Vandalism is medium"]
[null,null,"- Fire, explosion - the pipework is not routed along areas of Potential flammable atmosphere. Likelihood of emissions due to Fire or explosion is low"]
[null,null,"- Geological factors - There has been No evidence of wider geotechnical issues during the time the WwTW has been operational on the site.  Likelihood of emissions due to Geological issues is low"]
[null,null,"- Ageing - The pipework was installed in 2013 with an asset life of 30 years. They are regularly monitored to check for leakages and material failure. Likelihood of emissions due to age in low"]
[null,null,"- Lightning strike - the pipework is low relative to other structures within the area therefore unlikely to be struck by lightning.  Likelihood of emissions due to Lightning is low"]
[null,"Thermal Hydrolysis Tanks \n\n\nSpillage of non hazardous sludge: \n - catastrophic failure of tank\n - tank overflow or\n - tank leaks.","Containment:\n - Steel tank construction (6 of). Constructed in 2013 with a 20yr asset life. \n - High level alarms linked to site SCADA control program and interlock to stop pumping into the tanks if high level reached. \n - The tank is covered and venting to an odour control unit to prevent damage to the tank walls and roof during tanker unloading operations. \n- The site is designed to drain towards the site centre, away from identified Receptors. \n- The plant is equipped with safety features including pressure relief vents to allow emergency venting of steam and prevent damage to equipment.\n- The tank is surrounded by impermeable hardstanding which drains to the liquors return pumping station which would return spills for treatment\n","M"," - Tanks visually inspected weekly. \n - TCM checks are conducted regularly, including weekly visual inspection. \n - Site is manned 7 days per week for 12 hours per day.\n- Dependant on the age of the asset non destructive testing (NDT) is carried out every 10, 5, 2 years and yearly on all tanks and associated ancillary assets. The risk of catastrophic failure will therefore be identified before failure occurs.\n - Daily site task instruction ensures the areas of the site are inspected for any environmental or process risks. \n - The EMS contains procedures for tank failures.","L"]
[null,null,"Failure risk:"]
[null,null," - Catastrophic tank failure - The tank is relatively new and has been designed and constructed according to relevant YW technical standards.  YW have never experienced catastrophic failure of steel tanks built to these standards.  Based on the CIRIA risk criteria for steel tanks, the potential is therefore considered medium."]
[null,null," - Tank overflow or leaks - Due to level monitors and the interlock on pumps feeding sludge , The risk of overflow is low.  "]
[null,null,"- Potential for minor leakage around pipe flanges, where they enter and exit the tank, however these would be contained by the impermeable surfacing and drainage. Emission due to overflow or leaks is therefore considered low."]
[null,null,"-Shortcomings or failure in operational control system: the site is maintained inline with a proactive maintenance schedule and the EMS to ensure ongoing operation of all plant items. Operators are trained in the running of plant items. Likelihood of emissions due to operational failure is low"]
[null,null,"- Abuse -all site staff and tanker Operators are trained to operate the digester feed tank. HAZOP studies have been undertaken as part of the design process. No risk of overflow, due to level monitors and the interlock on feed pumps. Likelihood of emissions due to Abuse is low"]
[null,null,"- Impact - the tanks are located away from the site road.  Likelihood of emissions due to impacts low"]
[null,null,"- Vandalism, etc. -the STF and WwTW are within a fenced and gated site, with access to the site control by security.  Likelihood of emissions due to Vandalism is medium"]
[null,null,"- Fire, explosion - the tank is continuously mixed and vented to the odour control unit, flammable gasses would not build up in the tank.  Likelihood of emissions due to Fire or explosion is low"]
[null,null,"- Geological factors - There has been no evidence of wider geotechnical issues during the time the WwTW has been operational on the site.  the tank was designed with geotechnical design input.  Likelihood of emissions due to Geological issues is low"]
[null,null,"- Ageing - Tank constructed in 2013 with an asset life of 20 years. Likelihood of emissions due to age in low"]
[null,"Digester Buffer Tank\n\n\nSpillage of non hazardous sludge: \n - catastrophic failure of tank\n - tank overflow or\n - tank leaks.","Containment:\n - Steel tank construction. Constructed in 2013 with a 20yr asset life. \n - High level alarms linked to site SCADA control program and interlock to stop pumping into the tanks if high level reached. \n - The tank is covered and venting to an odour control unit to prevent damage to the tank walls and roof during tanker unloading operations. \n- The site is designed to drain towards the site centre, away from identified Receptors. \n- The digester feed tank outlet pipework exits at the bottom of the tank and rises above ground immediately past the tank wall, over impermeable surfacing that falls to the site drainage\n- The tank is surrounded by impermeable hardstanding which drains to the liquors return pumping station which would return spills for treatment\n","M"," - Tanks visually inspected weekly. \n - TCM checks are conducted regularly, including weekly visual inspection. \n - Site is manned 7 days per week for 12 hours per day.\n- Dependant on the age of the asset non destructive testing (NDT) is carried out every 10, 5, 2 years and yearly on all tanks and associated ancillary assets. The risk of catastrophic failure will therefore be identified before failure occurs.\n - Daily site task instruction ensures the areas of the site are inspected for any environmental or process risks. \n - The EMS contains procedures for tank failures.\n - Minor to moderate spills will be cleaned up before there has been sufficient time for infiltration into the ground. ","L"]
[null,null,"Failure risk:"]
[null,null," - Catastrophic tank failure - The tank is relatively new. Yorkshire Water have never experienced catastrophic failure of concrete tanks build and maintained to the YWS specifications.  Based on the CIRIA risk criteria for steel tanks, the potential is therefore considered medium."]
[null,null," - Tank overflow or leaks - Due to level monitors and the interlock on pumps feeding sludge , The risk of overflow is low.  "]
[null,null,"- Potential for minor leakage around pipe flanges, where they enter and exit the tank, however these would be contained by the impermeable surfacing and drainage. Emission due to overflow or leaks is therefore considered low."]
[null,null,"-Shortcomings or failure in operational control system: the site is maintained inline with a proactive maintenance schedule and the EMS to ensure ongoing operation of all plant items. Operators are trained in the running of plant items. Likelihood of emissions due to operational failure is low"]
[null,null,"- Abuse -all site staff and tanker Operators are trained to operate the digester feed tank. HAZOP studies have been undertaken as part of the design process. No risk of overflow, due to level monitors and the interlock on feed pumps. Likelihood of emissions due to Abuse is low"]
[null,null,"- Impact - the tanks are located away from the site road.  Likelihood of emissions due to impacts low"]
[null,null,"- Vandalism, etc. -the STF and WwTW are within a fenced and gated site, with access to the site control by security.  Likelihood of emissions due to Vandalism is medium"]
[null,null,"- Fire, explosion - the tank is continuously mixed and vented to the odour control unit, flammable gasses would not build up in the tank.  Likelihood of emissions due to Fire or explosion is medium"]
[null,null,"- Geological factors - There has been no evidence of wider geotechnical issues during the time the WwTW has been operational on the site.  the tank was designed with geotechnical design input.  Likelihood of emissions due to Geological issues is low"]
[null,null,"- Ageing - Tank constructed in 2013 with an asset life of 20 years. Likelihood of emissions due to age in low"]
[null,null,"- Lightning strike - the plant items are low relative to other structures within the are therefore unlikely to be struck by lightning.  Likelihood of emissions due to Lightning is low"]
[null,"Pipework associated with the digester buffer tank\n\n - Spillage of non hazardous sludge: catastrophic failure and leaks from pipework.","Containment: \n- All pipelines, valves are made from steel and single-skinned\n- Digester feed tank outlet pipework exits below the tank and runs a short distance below ground. This continues  above ground where it is on impermeable surfacing that falls to the site drainage. \n- Isolation valves are present at each end of pipe sections. This allows the isolation of leaking or failed pipe sections and limits the volume released.","M"," - Pipework visually inspected weekly. \n - Pipework is lagged to prevent freezing\n - TCM checks are conducted regularly, including weekly visual inspection. \n - Site is manned 7 days per week for 12 hours per day.\n - Non Destructive Testing is carried out every 10 years on all ancillary assets. \n - Daily site task instruction ensures the areas of the site are inspected for any environmental or process risks. \n - The EMS contains procedures for pipework failures.\n - Minor to moderate spills will be cleaned up before there has been sufficient time for infiltration into the ground. \n - Potential for leaking from the pipework will be tested using a Water industry standard drop test, to monitor for the risk of containment failure so this can be mitigated. ","L"]
[null,null,"Failure risk:"]
[null,null," - Catastrophic pipe failure - Following pressure testing the potential for catastrophic failure is considered medium."]
[null,null," - Leaks from over ground pipework -  Following pressure testing and with regular checking for leakage it is therefore considered that there is a low likelihood of significant leakage. Any leaks would be contained by the site drainage. The potential for emission is therefore considered low.  "]
[null,null," - Leaks from underground pipework would be emitted to ground.  Underground pipework is designed and maintained to Yorkshire Water specifications, this includes regular internal inspection. The risk of emission due to leaks is therefore considered to be medium. "]
[null,null,"- Catastrophic failure of pipe joints and flanges, particularly downstream of the pumps - Any sudden loss of pressure related to a catastrophic pipe failure would be identified by the site SCADA system resulting all pumping being stopped and an alarm on the site SCADA system, therefore reducing any emissions. Likelihood of emissions due to catastrophic pipe failure is considered medium. "]
[null,null,"- Shortcomings or failure in operational control system: The site is maintained inline with a proactive maintenance schedule and the EMS to ensure ongoing operation of all plant items. Operators are trained in the running of plant items. The risk of emission of sludge is considered medium"]
[null,null,"- Abuse - All site staff and tanker operators are trained to operate the plant items. HAZOP studies have been undertaken as part of the design process. No risk of overflow, due to level monitors and the interlock on feed pumps. Likelihood of emissions due to abuse is low "]
[null,null,"- Impact -  The pipework located away from site road and is surrounded by a fence.  Likelihood of emissions due to impacts low"]
[null,null,"- Vandalism, etc. - the pipework is within the fenced and gated site, monitored via security surveillance.  Likelihood of emissions due to Vandalism is medium"]
[null,null,"- Fire, explosion - Pipework carrying sludge is designed to avoid gas generation and build up.  Likelihood of emissions due to Fire or explosion is low. "]
[null,null,"- Geological factors - There has been No evidence of wider geotechnical issues during the time the WwTW has been operational on the site. The pipework was designed with geotechnical design input.  Likelihood of emissions due to Geological issues is low"]
[null,null,"- Ageing - The pipework was installed in 2013 with an asset life of 30 years. They are regularly monitored to check for leakages and material failure. Likelihood of emissions due to age in low"]
[null,null,"- Lightning strike - the pipework is low relative to other structures within the area therefore unlikely to be struck by lightning.  Likelihood of emissions due to Lightning is low"]
[null,"Digesters\n\n\nSpillage of non hazardous sludge: \n - catastrophic failure of tank\n - tank overflow or\n - tank leaks.","Containment:\n - Four aluminium-clad and insulated concrete constructed tanks. One constructed in 2013, and three constructed 2008, with a 60yr asset life's. \n - High level alarms linked to site SCADA control program and interlock to stop pumping into the tanks if high level reached. \n - The tank is covered and biogas collected in the headspace. Biogas is continuously transferred to the gas holder for storage.\n- The site is designed to drain towards the site centre, away from identified Receptors. \n- The tank is surrounded by impermeable hardstanding which drains to the liquors return pumping station which would return spills for treatment\n","M"," - Tanks visually inspected weekly. \n - TCM checks are conducted regularly, including weekly visual inspection. \n - Site is manned 7 days per week for 12 hours per day.\n- Dependant on the age of the asset non destructive testing (NDT) is carried out every 10, 5, 2 years and yearly on all tanks and associated ancillary assets. The risk of catastrophic failure will therefore be identified before failure occurs.\n - Daily site task instruction ensures the areas of the site are inspected for any environmental or process risks. \n - The EMS contains procedures for tank failures.\n - Minor to moderate spills will be cleaned up before there has been sufficient time for infiltration into the ground. ","L"]
[null,null,"Failure risk:"]
[null,null," - Catastrophic tank failure - Pressure relief valves are provided in the tank roof and the biogas offtake pipework to gas storage, therefore avoiding high pressure building (relief pressure set at 35mbarg) up in the tank. Yorkshire Water have never experienced catastrophic failure of any concrete tanks. Based on the CIRIA risk criteria and Yorkshire Water’s experience of tank failure the risk of loss of containment due to catastrophic tank failure is considered medium. "]
[null,null," - Tank overflow or leaks - Due to level monitors and the interlock on pumps feeding sludge , The risk of overflow is low.  "]
[null,null,"- Potential for minor leakage around pipe flanges, where they enter and exit the tank, however these would be contained by the impermeable surfacing and drainage. Emission due to overflow or leaks is therefore considered low."]
[null,null,"-Shortcomings or failure in operational control system: the site is maintained inline with a proactive maintenance schedule and the EMS to ensure ongoing operation of all plant items. Operators are trained in the running of plant items. Likelihood of emissions due to operational failure is medium"]
[null,null,"- Abuse -all site staff and tanker Operators are trained to operate the plant item. HAZOP studies have been undertaken as part of the design process. No risk of overflow, due to level monitors and the interlock on feed pumps. Likelihood of emissions due to Abuse is low."]
[null,null,"- Impact - The tanks are protected by road kerbs and access is restricted within the digester compound.  Likelihood of emissions due to impacts low"]
[null,null,"- Vandalism, etc. -the STF and WwTW are within a fenced and gated site, with access to the site control by security.  Likelihood of emissions due to Vandalism is medium"]
[null,null,"- Fire, explosion - The tanks are designed to generate biogas, this will accumulate in the headspace.  Under normal operation this gas is not flammable as insufficient oxygen is  present for combustion.  DSEAR design and management controls mean that at all points where a flammable mixture could be formed e.g. PRVs, no source of ignition will be present .  Likelihood of emissions due to Fire or explosion is medium."]
[null,null,"- Geological factors - There has been no evidence of wider geotechnical issues during the time the WwTW has been operational on the site. The tanks were designed with geotechnical design input.  Likelihood of emissions due to Geological issues is low"]
[null,null,"- Ageing - Tanks constructed in 2013 and 2008, with an asset life of 60 years. Likelihood of emissions due to age in low"]
[null,null,"- Lightning strike - Lightning protection risk assessment carried out and lightning protection installed. Likelihood of emissions due to Lightning is low."]
[null,"Pipework associated with the digesters\n\n - Spillage of non hazardous sludge: catastrophic failure and leaks from pipework.","Containment: \n- All pipelines, valves are made from steel and single-skinned \n- Digester inlet and outlet pipework, recirculation pipework are all above ground and over impermeable surfacing that falls to the site drainage\n- Isolation valves are present at each end of pipe sections. This allows the isolation of leaking or failed pipe sections and limits the volume released.","M"," - Pipework visually inspected weekly. \n - Pipework is lagged to prevent freezing\n - TCM checks are conducted regularly, including weekly visual inspection. \n - Site is manned 7 days per week for 12 hours per day.\n - Non Destructive Testing is carried out every 10 years on all ancillary assets. \n - Daily site task instruction ensures the areas of the site are inspected for any environmental or process risks. \n - The EMS contains procedures for pipework failures.\n - Minor to moderate spills will be cleaned up before there has been sufficient time for infiltration into the ground. \n - Potential for leaking from the pipework will be tested using a Water industry standard drop test, to monitor for the risk of containment failure so this can be mitigated. ","L"]
[null,null,"Failure risk:"]
[null,null," - Catastrophic pipe failure - Following pressure testing the potential for catastrophic failure is considered medium."]
[null,null," - Leaks from underground pipework would be emitted to ground.  Underground pipework is designed and maintained to Yorkshire Water specifications, this includes regular internal inspection. The risk of emission due to leaks is therefore considered to be medium. "]
[null,null,"- Catastrophic failure of pipe joints and flanges, particularly downstream of the pumps - Any sudden loss of pressure related to a catastrophic pipe failure would be identified by the site SCADA system resulting all pumping being stopped and an alarm on the site SCADA system, therefore reducing any emissions. Likelihood of emissions due to catastrophic pipe failure is considered medium. "]
[null,null,"-Shortcomings or failure in operational control system: the site is maintained inline with a proactive maintenance schedule and the EMS to ensure ongoing operation of all plant items. Operators are trained in the running of plant items. Likelihood of emissions due to operational failure is low"]
[null,null,"- Impact - The pipework is protected by road kerbs and access is restricted within the digester compound.  A fence surrounds the digester compound.  Likelihood of emissions due to impacts low"]
[null,null,"- Vandalism, etc. -the STF and WwTW are within a fenced and gated site, with access to the site control by security.  Likelihood of emissions due to Vandalism is medium"]
[null,null,"- Fire, explosion - Pipework carrying sludge is designed to avoid gas generation and build up.  Likelihood of emissions due to Fire or explosion is low. "]
[null,null,"- Geological factors - There has been no evidence of wider geotechnical issues during the time the WwTW has been operational on the site. The tanks were designed with geotechnical design input.  Likelihood of emissions due to Geological issues is low"]
[null,null,"- Ageing - The pipework was installed in 2013 with an asset life of 30 years. They are regularly monitored to check for leakages and material failure. Likelihood of emissions due to age in low"]
[null,null,"- Lightning strike - Lightning protection risk assessment carried out and lightning protection installed. Likelihood of emissions due to Lightning is low."]
[null,"Sludge Degassing Tanks\n\n\nSpillage of non hazardous sludge: \n - catastrophic failure of tank\n - tank overflow or\n - tank leaks.","Containment:\n - Concrete tank construction. Constructed in 2007 with a 60yr asset life. \n - High level alarms linked to site SCADA control program and interlock to stop pumping into the tanks if high level reached. \n - The tank is air-mixed and covered but includes a vent to atmosphere to prevent damage to the tank walls. The tank is also connected to an odour dispersion unit.\n- Outlet pipework exits at the bottom of tank and short section of the pipe routed below ground and rises above ground beyond tank wall.\n- The site is designed to drain towards the site centre, away from identified Receptors. \n- The tank is surrounded by impermeable hardstanding which drains to the liquors return pumping station which would return spills for treatment\n","M"," - Tanks visually inspected weekly. \n - TCM checks are conducted regularly, including weekly visual inspection. \n - Site is manned 7 days per week for 12 hours per day.\n- Dependant on the age of the asset non destructive testing (NDT) is carried out every 10, 5, 2 years and yearly on all tanks and associated ancillary assets. The risk of catastrophic failure will therefore be identified before failure occurs.\n - Daily site task instruction ensures the areas of the site are inspected for any environmental or process risks. \n - The EMS contains procedures for tank failures.\n - Minor to moderate spills will be cleaned up before there has been sufficient time for infiltration into the ground. ","L"]
[null,null,"Failure risk:"]
[null,null," - Catastrophic tank failure -  Yorkshire Water have never experienced catastrophic failure of concrete tanks build and maintained to the YWS specifications.  Based on the CIRIA risk criteria for steel tanks, the potential is therefore considered low."]
[null,null," - Tank overflow or leaks - Due to level monitors and the interlock on digester feed pumps. The risk of overflow is low.  "]
[null,null,"- Potential for minor leakage around pipe flanges, where they enter and exit the tank, however these would be contained by the impermeable surfacing and drainage. Emission due to overflow or leaks is therefore considered low."]
[null,null,"-Shortcomings or failure in operational control system: the site is maintained inline with a proactive maintenance schedule and the EMS to ensure ongoing operation of all plant items. Operators are trained in the running of plant items. Likelihood of emissions due to operational failure is medium"]
[null,null,"- Abuse -all site staff and tanker Operators are trained to operate the tank. HAZOP studies have been undertaken as part of the design process. No risk of overflow, due to level monitors and the interlock on feed pumps. Likelihood of emissions due to Abuse is low"]
[null,null,"- Impact - the tank is located away from site road and access within STF compound is controlled.  Likelihood of emissions due to impacts low"]
[null,null,"- Vandalism, etc. -the STF and WwTW are within a fenced and gated site, with access to the site control by security.  Likelihood of emissions due to Vandalism is medium"]
[null,null,"- Fire, explosion - the tank is vented so flammable gasses would not build up in the tank.  Likelihood of emissions due to Fire or explosion is medium.  "]
[null,null,"- Geological factors - There has been no evidence of wider geotechnical issues during the time the WwTW has been operational on the site.  the tank was designed with geotechnical design input.  Likelihood of emissions due to Geological issues is low"]
[null,null,"- Ageing - Tanks constructed in 2007 with an asset life of 60 years. Likelihood of emissions due to age in low"]
[null,null,"- Lightning strike - the plant items are low relative to other structures within the are therefore unlikely to be struck by lightning.  Likelihood of emissions due to Lightning is low"]
[null,"Pipework associated with the degassing tanks\n\n - Spillage of non hazardous sludge: catastrophic failure and leaks from pipework.","Containment: \n- All pipelines, valves are made from steel and mainly single-skinned\n- Digester sludge transfer tank outlet pipework exits below the tank and runs a short distance below ground. This continues above ground where it is on impermeable surfacing that falls to the site drainage. Double contained at the transfer pumps inlet and outlet connection points, mounted on hardstanding.\n- Isolation valves are present at each end of pipe sections. This allows the isolation of leaking or failed pipe sections and limits the volume released.","M"," - Pipework visually inspected weekly. \n - Pipework is lagged to prevent freezing\n - TCM checks are conducted regularly, including weekly visual inspection. \n - Site is manned 7 days per week for 12 hours per day.\n - Non Destructive Testing is carried out every 10 years on all ancillary assets. \n - Daily site task instruction ensures the areas of the site are inspected for any environmental or process risks. \n - The EMS contains procedures for pipework failures.\n - Minor to moderate spills will be cleaned up before there has been sufficient time for infiltration into the ground. \n - Potential for leaking from the pipework will be tested using a Water industry standard drop test, to monitor for the risk of containment failure so this can be mitigated. ","L"]
[null,null,"Failure risk:"]
[null,null," - Catastrophic pipe failure - Following pressure testing the potential for catastrophic failure is considered medium."]
[null,null," - Leaks from over ground pipework -  Following pressure testing and with regular checking for leakage it is therefore considered that there is a low likelihood of significant leakage. Any leaks would be contained by the site drainage. The potential for emission is therefore considered low.  "]
[null,null," - Leaks from underground pipework would be emitted to ground.  Underground pipework is designed and maintained to Yorkshire Water specifications, this includes regular internal inspection. The risk of emission due to leaks is therefore considered to be medium. "]
[null,null,"- Catastrophic failure of pipe joints and flanges, particularly downstream of the pumps - Any sudden loss of pressure related to a catastrophic pipe failure would be identified by the site SCADA system resulting all pumping being stopped and an alarm on the site SCADA system, therefore reducing any emissions. Likelihood of emissions due to catastrophic pipe failure is considered medium. "]
[null,null,"- Shortcomings or failure in operational control system: The site is maintained inline with a proactive maintenance schedule and the EMS to ensure ongoing operation of all plant items. Operators are trained in the running of plant items. The risk of emission of sludge is considered low"]
[null,null,"- Abuse - All site staff and tanker operators are trained to operate the plant items. HAZOP studies have been undertaken as part of the design process. No risk of overflow, due to level monitors and the interlock on feed pumps. Likelihood of emissions due to abuse is low "]
[null,null,"- Impact - The pipework is protected by road kerbs and access is restricted within the STF compound.  Likelihood of emissions due to impacts low"]
[null,null,"- Vandalism, etc. - the pipework is within the fenced and gated site, monitored via security surveillance.  Likelihood of emissions due to Vandalism is medium"]
[null,null,"- Fire, explosion - Pipework carrying sludge is designed to avoid gas generation and build up.  Likelihood of emissions due to Fire or explosion is low. "]
[null,null,"- Geological factors - There has been No evidence of wider geotechnical issues during the time the WwTW has been operational on the site. The pipework was designed with geotechnical design input.  Likelihood of emissions due to Geological issues is low"]
[null,null,"- Ageing - The pipework was installed in 2013 with an asset life of 30 years. They are regularly monitored to check for leakages and material failure. Likelihood of emissions due to age in low"]
[null,null,"- Lightning strike - the pipework is low relative to other structures within the area therefore unlikely to be struck by lightning.  Likelihood of emissions due to Lightning is low"]
[null,"Dewatering Feed Tanks\n\nSpillage of non hazardous sludge: \n - catastrophic failure of tank\n - tank overflow or\n - tank leaks.","Containment:\n - Steel tank construction. Constructed in 2013 with a 20 yr asset life. \n - High level alarms linked to site SCADA control program and interlock to stop pumping into the tanks if high level reached. \n- High level alarms linked to site SCADA control program and activate alarm at tanker off-loading point\n- The tank is uncovered and has overflow arrangement which directs excess flows to drain, ultimately returned to the works for treatment.\n- The site is designed to drain towards the site centre, away from identified Receptors. \n- The tank is surrounded by impermeable hardstanding which drains to the dewatering liquors pumping station which would return spills for treatment\n","M"," - Tanks visually inspected weekly. \n - TCM checks are conducted regularly, including weekly visual inspection. \n - Site is manned 7 days per week for 12 hours per day.\n- Dependant on the age of the asset non destructive testing (NDT) is carried out every 10, 5, 2 years and yearly on all tanks and associated ancillary assets. The risk of catastrophic failure will therefore be identified before failure occurs.\n - Daily site task instruction ensures the areas of the site are inspected for any environmental or process risks. \n - The EMS contains procedures for tank failures.\n - Minor to moderate spills will be cleaned up before there has been sufficient time for infiltration into the ground.\n- Sludge inventory to be reduced and sludge flows held back if flooding expected","L"]
[null,null,"Failure risk:"]
[null,null," - Catastrophic tank failure - The tank is relatively new. Yorkshire Water have never experienced catastrophic failure of concrete tanks build and maintained to the YWS specifications. The likelihood of emissions due to catastrophic tank failure is medium."]
[null,null," - Tank overflow or leaks - Due to level monitors and the interlock on digested sludge transfer pumps, The risk of overflow is low.  "]
[null,null,"- Potential for minor leakage around pipe flanges, where they enter and exit the tank, however these would be contained by the impermeable surfacing and drainage. Emission due to overflow or leaks is therefore considered low."]
[null,null,"-Shortcomings or failure in operational control system: the site is maintained inline with a proactive maintenance schedule and the EMS to ensure ongoing operation of all plant items. Operators are trained in the running of plant items. Likelihood of emissions due to operational failure is low"]
[null,null,"- Abuse - All site staff and tanker Operators are trained to operate the tank. HAZOP studies have been undertaken as part of the design process. No risk of overflow, due to level monitors and the interlock on feed pumps. Likelihood of emissions due to Abuse is low"]
[null,null,"- Impact - the tank is located away from site road and access within digester compound is limited.  Likelihood of emissions due to impacts low"]
[null,null,"- Vandalism, etc. -the STF and WwTW are within a fenced and gated site, with access to the site control by security.  Likelihood of emissions due to Vandalism is medium"]
[null,null,"- Fire, explosion - the tank is uncovered and sludge is treated sufficiently with no likelihood of flammable atmosphere formation. Likelihood of emissions due to fire or explosions is low."]
[null,null,"- Geological factors - There has been no evidence of wider geotechnical issues during the time the WwTW has been operational on the site. The tank was designed with geotechnical design input.  Likelihood of emissions due to Geological issues is low"]
[null,null,"- Ageing - Tanks constructed in 2013 with an asset life of 20 years. Likelihood of emissions due to age in low"]
[null,null,"- Lightning strike - Lightning protection risk assessment carried out and lightning protection installed. Likelihood of emissions due to Lightning is low."]
[null,"Pipework associated with the dewatering feed tank\n\n - Spillage of non hazardous sludge: catastrophic failure and leaks from pipework.","Containment: \n- All pipelines, valves are made from steel and single-skinned\n- Dewatering feed tank inlet pipework are above ground and over impermeable surfacing that falls to the site drainage\n- Dewatering feed tank outlet pipework exits below the tank and runs a short distance below ground. This continues above ground where it is on impermeable surfacing that falls to the dewatering site drainage. \n- Isolation valves are present at each end of pipe sections. This allows the isolation of leaking or failed pipe sections and limits the volume released.\n","M"," - Pipework visually inspected weekly. \n - Pipework is lagged to prevent freezing\n - TCM checks are conducted regularly, including weekly visual inspection. \n - Site is manned 7 days per week for 12 hours per day.\n - Non Destructive Testing is carried out every 10 years on all ancillary assets. \n - Daily site task instruction ensures the areas of the site are inspected for any environmental or process risks. \n - The EMS contains procedures for pipework failures.\n - Minor to moderate spills will be cleaned up before there has been sufficient time for infiltration into the ground. \n - Potential for leaking from the pipework will be tested using a Water industry standard drop test, to monitor for the risk of containment failure so this can be mitigated. ","L"]
[null,null,"Failure risk:"]
[null,null," - Catastrophic pipe failure - Following pressure testing the potential for catastrophic failure is considered low."]
[null,null," - Leaks from over ground pipework -  Following pressure testing and with regular checking for leakage it is therefore considered that there is a low likelihood of significant leakage. Any leaks would be contained by the site drainage. The potential for emission is therefore considered low.  "]
[null,null," - Leaks from underground pipework would be emitted to ground.  Underground pipework is designed and maintained to Yorkshire Water specifications, this includes regular internal inspection. The risk of emission due to leaks is therefore considered to be medium. "]
[null,null,"- Catastrophic failure of pipe joints and flanges, particularly downstream of the pumps - Any sudden loss of pressure related to a catastrophic pipe failure would be identified by the site SCADA system resulting all pumping being stopped and an alarm on the site SCADA system, therefore reducing any emissions. Likelihood of emissions due to catastrophic pipe failure is considered medium. "]
[null,null,"- Shortcomings or failure in operational control system: The site is maintained inline with a proactive maintenance schedule and the EMS to ensure ongoing operation of all plant items. Operators are trained in the running of plant items. The risk of emission of sludge is considered medium"]
[null,null,"- Abuse - All site staff and tanker operators are trained to operate the plant items. HAZOP studies have been undertaken as part of the design process. No risk of overflow, due to level monitors and the interlock on feed pumps. Likelihood of emissions due to abuse is low "]
[null,null,"- Impact - The tanks are protected by road kerbs and set back likely away from the chemical delivery area (polymer). Likelihood of emissions due to impacts low"]
[null,null,"- Vandalism, etc. - the pipework is within the fenced and gated site, monitored via security surveillance.  Likelihood of emissions due to Vandalism is medium"]
[null,null,"- Fire, explosion - Pipework carrying sludge is designed to avoid gas generation and build up.  Likelihood of emissions due to Fire or explosion is low. "]
[null,null,"- Geological factors - There has been No evidence of wider geotechnical issues during the time the WwTW has been operational on the site. The pipework was designed with geotechnical design input.  Likelihood of emissions due to Geological issues is low"]
[null,null,"- Ageing - The pipework was installed in 2013 with an asset life of 30 years. They are regularly monitored to check for leakages and material failure. Likelihood of emissions due to age in low"]
[null,null,"- Lightning strike - the pipework is low relative to other structures within the area therefore unlikely to be struck by lightning.  Likelihood of emissions due to Lightning is low"]
[null,"Digested cake pad and barn\n\n\nEmission of sludge solids from the conditioning pads\nLeaching of liquors to groundwater","Containment:\n- Dewatered digested sludge cake is normally stored on an impermeable concrete surface in a barn with a roof to protect from rainfall.  Additional processing is available at the conditioning pad, in this area sludge cake is discharged directly to the pad and then transferred to the barn for storage\n- A site excavator is used to load sludge cake into the haulage vehicles, which can result in sludge cake being tracked out of the area. \n- The site roads around the barn are impermeable and drain to the inlet pumping station which would return and sludge washed from the road for treatment.\n","M","- Area visually inspected every week \n- TCM checks are conducted regularly, including weekly visual inspection. \n - Site is manned 7 days per week for 12 hours per day.\n - Daily site task instruction ensures the areas of the site are inspected for any environmental or process risks. \n- Cake inventory to be reduced/moved to a safe location on/off site prior to flood events.","L"]
[null,null,"Failure risk:"]
[null,null,"Catastrophic containment failure - The sludge cake is dewatered and behaves as a solid rather than liquid.  There will be limited liquid leaching out, particularly for sludge on the outdoor conditioning pad during rainfall.  In both locations this will be captured by drainage systems and returned to the WwTW for treatment.  It must be noted that the digested sludge cake is mostly free from pathogen and commonly used as soil conditioner (safe to environment).  The likelihood of emissions is therefore medium."]
[null,null,"Spreading of sludge cake from the storage barn - Limited sludge would be tracked onto site roads and would be contained by the site drainage system The risk of emissions is therefore low. "]
[null,null,"Shortcomings or failure in operational control system: the site is maintained inline with a proactive maintenance schedule and the EMS to ensure ongoing operation of all plant items. Operators are trained in the running of plant items. Likelihood of emissions due to operational failure is low"]
[null,null,"Abuse - all site staff and vehicle operators are trained to follow standard operating procedures. Sludge cake is generally immobile. Likelihood of emissions due to Abuse is low"]
[null,null,"Impact -  The sludge cake is generally immobile and therefore any impact will not result in loss of containment. Likelihood of emissions due to impacts low"]
[null,null,"Vandalism, etc. - the cake storage is within a fenced and gated site, with access to the site control by security.  Likelihood of emissions due to Vandalism is low"]
[null,null,"Fire, explosion - The area is well ventilated and cake is relatively inert, no risk of flammable atmosphere forming.  Likelihood of emissions due to Fire or explosion is low"]
[null,null,"Geological factors - There has been no evidence of wider geotechnical issues during the time the WwTW has been operational on the site. The slab was designed with geotechnical design input.  Likelihood of emissions due to Geological issues is low"]
[null,null,"Ageing - The cake pad area was constructed in 1988 (asset life of 30 years) and the cake barn was constructed in 2013 (asset life of 30 years).   Likelihood of emissions due to age in low"]
[null,null,"Lightning strike - Sludge cake is a generally immobile substance. Any impact from a lightning strike, which is not considered likely to occur in this area, will not result in loss of containment. Likelihood of emissions due to lightning is low"]
[null,"Polyelectrolyte Storage (liquid)\n\n\nEmission of polymer (powder, liquid and make-up) from tank\nLeaching of polymer to groundwater","Containment:\n - Polyelectrolyte is used to treat the sludge prior to thickening and THP.  \n - Liquid polyelectrolyte is delivered to site and loaded into a bulk storage tank and bunded as per YW asset standards.  \n - Spillage of polymer liquid will be contained within the polymer handling area and it will not spread further.  \n - The polymer storage and preparation area is bunded.","M"," - Tanks visually inspected weekly. \n - TCM checks are conducted regularly, including weekly visual inspection. \n - Site is manned 7 days per week for 12 hours per day.\n- Dependant on the age of the asset non destructive testing (NDT) is carried out every 10, 5, 2 years and yearly on all tanks and associated ancillary assets. The risk of catastrophic failure will therefore be identified before failure occurs.\n - Daily site task instruction ensures the areas of the site are inspected for any environmental or process risks. \n - The EMS contains procedures for tank failures.\n - Minor to moderate spills will be cleaned up before there has been sufficient time for infiltration into the ground.","L"]
[null,null,"Failure risk:"]
[null,null,"- Catastrophic containment failure - Polymer is stored in a bulk storage tank and pumped into the make-up system, which is within its asset life, where it is diluted. The make-up tank is relatively low volume. The potential is therefore considered low."]
[null,null,"- Tank overflow or leaks - Due to level monitors and the interlock on feed pumps. The risk of overflow is low. "]
[null,null,"- There is potential for minor leakage around pipe flanges, where they enter and exit the tank, however these would be minimal and contained by the impermeable surfacing and drainage. Emission due to overflow or leaks is therefore considered low."]
[null,null,"- Shortcomings or failure in operational control system: the site is maintained inline with a proactive maintenance schedule and the EMS to ensure ongoing operation of all plant items. Operators are trained in the running of plant items. Likelihood of emissions due to operational failure is medium"]
[null,null,"- Abuse - All site staff are trained to operate the plant items. No risk of overflow, due to level monitors and the interlock on feed pumps. Likelihood of emissions due to Abuse is low"]
[null,null,"- Impact -  The polymer plant is located inside a building, safe from impact .  Likelihood of emissions due to impacts low"]
[null,null,"- Vandalism, etc. - the STF and WwTW are within a fenced and gated site, with access to the site control by security.  Likelihood of emissions due to Vandalism is medium"]
[null,null,"- Fire, explosion - There is no risk of flammable atmosphere formation in this area.  Likelihood of emissions due to Fire or explosion is low"]
[null,null,"- Geological factors - There has been no evidence of wider geotechnical issues during the time the WwTW has been operational on the site. The polymer plant building was designed with geotechnical design input.  Likelihood of emissions due to Geological issues is low"]
[null,null,"- Ageing - The polymer plant was installed in 2013 with an asset life of 20 years for the tank. Likelihood of emissions due to age in low"]
[null,null,"- Lightning strike - Lightning protection risk assessment carried out and surge protection device installed. Likelihood of emissions due to Lightning is low."]
[null,"Polyelectrolyte Storage\n(powder)\n\n\nEmission of polymer (powder and make-up) from tank\nLeaching of polymer to groundwater","Containment:\n - Polyelectrolyte is used to treat the sludge prior to THP.  \n - Polyelectrolyte will be stored in steel silos and bunded as per YW asset standards.  \n - Spillage of polymer powder/liquid will be contained within the polymer handling area and it will not spread further.  \n - The polymer storage and preparation area is bunded.","M"," - Tanks visually inspected weekly. \n - TCM checks are conducted regularly, including weekly visual inspection. \n - Site is manned 7 days per week for 12 hours per day.\n- Dependant on the age of the asset non destructive testing (NDT) is carried out every 10, 5, 2 years and yearly on all tanks and associated ancillary assets. The risk of catastrophic failure will therefore be identified before failure occurs.\n - Daily site task instruction ensures the areas of the site are inspected for any environmental or process risks. \n - The EMS contains procedures for tank failures.\n - Minor to moderate spills will be cleaned up before there has been sufficient time for infiltration into the ground.","L"]
[null,null,"Failure risk:"]
[null,null,"- Catastrophic containment failure - Powder polymer is stored in big-bag and emptied into the make-up system, which is within its asset life, where it is diluted. The make-up tank is relatively low volume and in a bunded area. The potential is therefore considered low."]
[null,null,"- Tank overflow or leaks - Due to level monitors and the interlock on feed pumps. The risk of overflow is low. "]
[null,null,"There is potential for minor leakage around pipe flanges, where they enter and exit the tank, however these would be minimal and contained by the impermeable surfacing and drainage. Emission due to overflow or  leaks is therefore considered low."]
[null,null,"- Shortcomings or failure in operational control system: the site is maintained inline with a proactive maintenance schedule and the EMS to ensure ongoing operation of all plant items. Operators are trained in the running of plant items. Likelihood of emissions due to operational failure is medium"]
[null,null,"- Abuse - All site staff are trained to operate the plant items. No risk of overflow, due to level monitors and the interlock on feed pumps. Likelihood of emissions due to Abuse is low"]
[null,null,"- Impact -  The polymer plant is located inside a building, safe from impact .  Likelihood of emissions due to impacts low"]
[null,null,"- Vandalism, etc. - the STF and WwTW are within a fenced and gated site, with access to the site control by security.  Likelihood of emissions due to Vandalism is medium"]
[null,null,"- Fire, explosion - There is no risk of flammable atmosphere formation in this area.  Likelihood of emissions due to Fire or explosion is low"]
[null,null,"- Geological factors - There has been no evidence of wider geotechnical issues during the time the WwTW has been operational on the site. The polymer plant building was designed with geotechnical design input.  Likelihood of emissions due to Geological issues is low"]
[null,null,"- Ageing - The polymer plant was installed in 2013 with an asset life of 20 years for the tank. Likelihood of emissions due to age in low"]
[null,null,"- Lightning strike - Lightning protection risk assessment carried out and surge protection device installed. Likelihood of emissions due to Lightning is low."]
[null,"Anti-Foam Storage\n\n\nEmission of chemical with low ecotoxicity\nLeaching to groundwater","Containment:\n- Anti-foam is to be brought into site in IBCs with appropriate spill containment as per YW asset standards.\n- Pipework is double-contained from IBC to dosing point.","M"," - Container is visually inspected weekly. \n - TCM checks are conducted regularly, including weekly visual inspection. \n - Site is manned 7 days per week for 12 hours per day.\n- Dependant on the age of the asset non destructive testing (NDT) is carried out every 10, 5, 2 years and yearly on all tanks and associated ancillary assets. The risk of catastrophic failure will therefore be identified before failure occurs.\n - Daily site task instruction ensures the areas of the site are inspected for any environmental or process risks. \n - The EMS contains procedures for tank failures.\n - Minor to moderate spills will be cleaned up before there has been sufficient time for infiltration into the ground.","L"]
[null,null,"Failure risk:"]
[null,null,"- Catastrophic tank failure - The IBC will be of relatively low volume. This must meet YWS specifications. Therefore the potential for emissions and bund failure is considered low."]
[null,null," - Tank overflow or leaks -  The container is vented to atmosphere so no over/under pressure impact during emptying. No risk of overflow with IBC. The tank is designed to the Yorkshire Water specifications. Likelihood of emissions due to design failures is low"]
[null,null,"- Potential for minor leakage around pipe flanges, where they enter and exit the tank, is considered low."]
[null,null,"- Operational failures -  Operators are trained in the running of the plant items. Likelihood of emissions due to operational failure is low"]
[null,null,"- Abuse - All site staff and tanker operators are trained to operate the tank/containers. No risk of overflow with IBC containers. Operators are trained to maintain venting to prevent IBC collapse as it is drained. Likelihood of emissions due to abuse is low "]
[null,null,"- Impact -  The IBC is sited away from vehicle traffic. Likelihood of emissions due to impacts low"]
[null,null,"- Vandalism, etc. - The STF is within a fenced and gated site, with access to the site control by security.  Likelihood of emissions due to vandalism is medium"]
[null,null,"- Fire, explosion – DSEAR assessment has been carried out in the digester area. Likelihood of emissions due to fire or explosion is low"]
[null,null,"- Geological factors - Based on the geotechnical survey carried out, there is no evidence of wider geotechnical issues during the time the STF has been operational on the site.  The tank was designed with geotechnical design input.  Likelihood of emissions due to geological issues is low "]
[null,null,"- Ageing – The IBC is delivered to site and will be accepted to YW standards and will be replaced as per standard Yorkshire Water procedures . Likelihood of emissions due to age is low"]
[null,null,"- Lightning strike - The IBC is of polypropylene material and therefore unlikely to be struck by lightning.  Likelihood of emissions due to Lightning is low"]
[null,"Glycol Storage\n\n\nEmission of chemical with low ecotoxicity\nLeaching to groundwater","Containment:\n- Glycol is to be brought into site in IBCs with appropriate spill containment as per YW asset standards.\n- Pipework is double-contained from IBC to dosing point.","L","N/A","L"]
[null,null,"Failure risk:"]
[null,null,"- Catastrophic tank failure - The IBC will be of relatively low volume. This must meet YWS specifications. Therefore the potential for emissions and bund failure is considered low."]
[null,null," - Tank overflow or leaks -  The container is vented to atmosphere so no over/under pressure impact during emptying. No risk of overflow with IBC. The tank is designed to the Yorkshire Water specifications. Likelihood of emissions due to design failures is low"]
[null,null,"- Potential for minor leakage around pipe flanges, where they enter and exit the tank, is considered low."]
[null,null,"- Operational failures -  Operators are trained in the running of the plant items. Likelihood of emissions due to operational failure is low"]
[null,null,"- Abuse - All site staff and tanker operators are trained to operate the tank/containers. No risk of overflow with IBC containers. Operators are trained to maintain venting to prevent IBC collapse as it is drained. Likelihood of emissions due to abuse is low "]
[null,null,"- Impact -  The IBC is sited away from vehicle traffic. Likelihood of emissions due to impacts low"]
[null,null,"- Vandalism, etc. - The STF is within a fenced and gated site, with access to the site control by security.  Likelihood of emissions due to vandalism is low"]
[null,null,"- Fire, explosion – DSEAR assessment has been carried out in the digester area. Likelihood of emissions due to fire or explosion is low"]
[null,null,"- Geological factors - Based on the geotechnical survey carried out, there is no evidence of wider geotechnical issues during the time the STF has been operational on the site.  The tank was designed with geotechnical design input.  Likelihood of emissions due to geological issues is low "]
[null,null,"- Ageing – The IBC is delivered to site and will be accepted to YW standards and will be replaced as per standard Yorkshire Water procedures . Likelihood of emissions due to age is low"]
[null,null,"- Lightning strike - The IBC is of polypropylene material and therefore unlikely to be struck by lightning.  Likelihood of emissions due to Lightning is low"]
[null,"Lubricating Oil Storage\n(fresh and waste)\n\nEmission of hazardous substance\nLeaching to groundwater","Containment:\n- Clean and waste fuel oil are steel self-bunded tanks with internal leakage detection. constructed to YW asset standards and Control of Pollution (Oil Storage) (England) Regulations 2001.","M"," - Tank is visually inspected weekly. \n - TCM checks are conducted regularly and visually inspected weekly. \n - Site is manned 7 days per week for 12 hours per day.\n- Dependant on the age of the asset non destructive testing (NDT) is carried out every 10, 5, 2 years and yearly on all tanks and associated ancillary assets. The risk of catastrophic failure will therefore be identified before failure occurs.\n - Daily site task instruction ensures the areas of the site are inspected for any environmental or process risks. \n - The EMS contains procedures for tank failures.\n - Minor to moderate spills will be cleaned up before there has been sufficient time for infiltration into the ground.","L"]
[null,null,"Failure risk:"]
[null,null,"- Catastrophic tank failure - the storage tanks are new and of relatively low volume. these are built and maintained to the YWS specifications. Therefore the potential for emissions and bund failure is considered medium."]
[null,null," - Tank overflow or leaks -  The containers are vented to atmosphere so no over/under pressure impact during filling or emptying. No risk of overflow, due to level monitors and the interlock on feed pumps. The tank is designed to the Yorkshire Water specifications. Likelihood of emissions due to design failures is low"]
[null,null,"- Potential for minor leakage around pipe flanges, where they enter and exit the tank, is considered low."]
[null,null,"- Operational failures -  Operators are trained in the running of the plant items. Likelihood of emissions due to operational failure is medium"]
[null,null,"- Abuse - All site staff and tanker operators are trained to operate the tank/containers. Low risk of overflow, due to level monitors on oil containers . Likelihood of emissions due to abuse is low "]
[null,null,"- Impact -  The containers are either stored within a building or sited away from vehicle traffic. Likelihood of emissions due to impacts low"]
[null,null,"- Vandalism, etc. - The STF is within a fenced and gated site, with access to the site control by security.  Likelihood of emissions due to vandalism is medium"]
[null,null,"- Fire, explosion – DSEAR assessment has been carried out in the CHP area. Likelihood of emissions due to fire or explosion is medium"]
[null,null,"- Geological factors - Based on the geotechnical survey carried out, there is no evidence of wider geotechnical issues during the time the STF has been operational on the site.  The tank was designed with geotechnical design input.  Likelihood of emissions due to geological issues is low "]
[null,null,"- Ageing – The containers were installed in 2013 and will be replaced as per standard Yorkshire Water procedures . Likelihood of emissions due to age is low"]
[null,null,"- Lightning strike - the plant items are low relative to other structures within the are therefore unlikely to be struck by lightning.  Likelihood of emissions due to Lightning is low"]

{"sheet":"4) Site Risk and Classification","index":8,"n_rows":108,"n_cols":5,"rows_kept":108,"cut":false,"hidden":false,"merged":[]}
[]
[]
[]
[]
["Activity","Site Hazard Rating","Likelihood","Overall Site Risk Rating","Indicated Class of Secondary Containment Required"]
["Site - overall summary score",{"$f":"'2) Site Hazard Rating'!E6","v":"High"},{"$f":"'3) Likelihood'!G11","v":"Low"},{"$f":"IF(D108<3,\"Low\",IF(D108<5,\"Medium\",\"High\"))","v":"Medium"},{"$f":"IF(D6=\"Low\",\"Class 1\",IF(D6=\"Medium\", \"Class 2\",\"Class 3\"))","v":"Class 2"}]
["Sludge Import Screen Tank\n","High","Low","Medium",{"$f":"IF(D7=\"Low\",\"Class 1\",IF(D7=\"Medium\", \"Class 2\",\"Class 3\"))","v":"Class 2"}]
["Consolidation Tank 5","High","Low","Medium","Class 2"]
["Mixed Sludge Tanks","High","Low","Medium","Class 2"]
["Pipework associated with the sludge import, mixed tanks and sludge screen","High","Low","Medium","Class 2"]
["Un-thickened SAS transfer tank","High","Low","Medium",{"$f":"IF(D11=\"Low\",\"Class 1\",IF(D11=\"Medium\", \"Class 2\",\"Class 3\"))","v":"Class 2"}]
["Thickened SAS transfer tank","High","Low","Medium","Class 2"]
["Pipework associated with the SAS tanks","High","Low","Medium","Class 2"]
["Cake Reception System","High","Low","Medium","Class 2"]
["Pipework associated cake reception, rewetting and transfer systems","High","Low","Medium","Class 2"]
["Thermal Hydrolysis Tanks ","High","Low","Medium","Class 2"]
["Digester Buffer Tank","High","Low","Medium","Class 2"]
["Pipework associated with the digester buffer tank","High","Low","Medium","Class 2"]
["Digesters","High","Low","Medium","Class 2"]
["Pipework associated with the digesters","High","Low","Medium","Class 2"]
["Sludge Degassing and Conditioning Tanks","High","Low","Medium","Class 2"]
["Pipework associated with the digested degassing and conditioning tanks","High","Low","Medium","Class 2"]
["Digested Sludge Transfer Pipework","High","Low","Medium","Class 2"]
["Dewatering Feed Tanks","High","Low","Medium","Class 2"]
["Pipework associated with the dewatering feed tank","High","Low","Medium","Class 2"]
["Digested cake pad and barn","High","Low","Medium","Class 2"]
["Polyelectrolyte Storage (liquid)","High","Low","Medium","Class 2"]
["Polyelectrolyte Storage\n(powder)","High","Low","Medium","Class 2"]
["Anti-Foam Storage","High","Low","Medium","Class 2"]
["Glycol Storage","High","Low","Medium","Class 2"]
["Lubricating Oil Storage\n(fresh and waste)","High","Low","Medium","Class 2"]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
["Rating lookup table"]
["Low",1]
["Medium",2]
["High",3]
[]
["This assessment score"]
[{"$f":"VLOOKUP(B6,A103:B105,2,FALSE)","v":3},{"$f":"VLOOKUP(C6,A103:B105,2,FALSE)","v":1},null,{"$f":"A108*B108","v":3}]

{"sheet":"5) Standard Containment Designs","index":9,"n_rows":129,"n_cols":8,"rows_kept":129,"cut":false,"hidden":false,"merged":[]}
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[null,null,null,null,null,null,null,{"$f":"IF('4) Site Risk and Classification'!$E$6=\"Class 1\", \"Your site needs a design based on this diagram\",\"\")","v":""}]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[null,null,null,null,null,null,null,{"$f":"IF('4) Site Risk and Classification'!$E$6=\"Class 3\", \"Your site needs a design based on this diagram\",\"\")","v":""}]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[null,"# ","Material ","When used ","How ","Why "]
[]
[]
[null,"A ","Clay ","If plentiful on site ","1m thick, sheepsfoot roller etc. ","Low cost & effective. "]
[]
[]
[null,"B ","Stabilised soil ","If soil tested and is suitable ","Sample and test to determine amount of lime, cement and depth. ","Low cost & effective when no clay on site. "]
[]
[]
[null,"C ","Bentonite matting ","If A or B not suitable ","Prepare sub, roll out and cover. ","Moderate cost. Quick & easy to lay. Tolerant of damage. "]
[]
[]
[null,"D ","Landfill liner type foil ","If A, B or C not suitable ","Prepare sub, roll out, weld and cover. "]
[]
[]
[null,"E ","Concrete ","Small areas only ","Shutter, place mesh and pour fibre reinforced.","Only if A, B, C or D not suitable. "]

{"sheet":"Sheet1","index":10,"n_rows":46,"n_cols":13,"rows_kept":46,"cut":false,"hidden":true,"merged":[]}
[]
[]
[null,null,1,null,2,null,3,null,4,null,5,null,6]
[null,null,"Ag Man",null,"Ag Man & PGC",null,"Ag Man & FW",null,"PGC & FW",null,"FW",null,"Indus & commercial inc green waste"]
[null,"Approx size typical plant +/- 50 %","150 kW",null,"500 kW",null,"1 MW",null,"1 MW",null,"1.5 MW",null,"> 2MW"]
[1,"Source"]
[null,"Farm yard manure","L"]
[null,"Slurry","L"]
[null,"Energy Crops","L"]
[null,"Energy Crop silage","M"]
[null,"Energy crop silage effluent","H"]
[null,"Food waste","-"]
[null,"Green waste","-"]
[]
[null,"Digestate","L",null,"L",null,"M",null,"M",null,"H"]
[null,"Based on vol and aquatic pollutant results"]
[]
[null,"Separated digestate solids","L"]
[null,"Separated digestate liquid","L"]
[]
[null,"Rainwater or surface water runoff contaminated by inventory","L"]
[]
[null,"Fire Fighting Agents harmful in their own right or contaminated by inventory","N/A"]
[]
[null,"Fire fighting and cooling water contaminated by inventory","N/A"]
[]
[2,"Pathway"]
[null,"Site layout and drainage"]
[]
[null,"Topography, geology and hydrology"]
[]
[null,"Climatic conditions"]
[]
[3,"Receptors"]
[null,"Groundwater","See groundwater sheet (similar to amaya's inventory sheet)"]
[]
[null,"Surface water"]
[]
[null,"Local Water Quality"]
[]
[null,"Protected areas"]
[]
[null,"Overall site hazard rating"]
[]
[]
[4,"Liklihood"]

{"sheet":"Risk Scoring","index":11,"n_rows":17,"n_cols":20,"rows_kept":17,"cut":false,"hidden":true,"merged":[[1,17,4,17],[7,11,7,14]]}
[null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,"Risk Rating"]
[null,"Rating",null,"Likelihood",null,null,"Consequence","incident level",null,null,null,{"$f":"L6*$P$2","v":4},{"$f":"M6*$P$2","v":8},12,16,4,"H","Consequence",null,"High"]
[null,"Very low",null,1,"up to 10%",null,1,"Category 4",null,null,null,{"$f":"L6*$P$3","v":3},{"$f":"M6*$P$3","v":6},9,12,3,"M",null,null,"Medium High"]
[null,"Low",null,2,"up to 20%",null,2,"Category 3",null,null,null,{"$f":"L6*$P$4","v":2},{"$f":"M6*$P$4","v":4},6,8,2,"L",null,null,"Medium Low"]
[null,"Medium",null,3,"up to 50%",null,3,"Category 2",null,null,null,{"$f":"L6*$P$5","v":1},{"$f":"M6*$P$5","v":2},3,4,1,"VL",null,null,"Low"]
[null,"High",null,4,"up to 70%",null,4,"Category 1",null,null,null,1,2,3,4]
[null,null,null,null,null,null,null,null,null,null,null,"VL","L","M","H"]
[null,null,null,null,null,null,null,null,null,null,null,"Likelihood"]
[]
[]
[null,"Category 1 – major, serious, persistent and/or extensive impact or effect"]
[null,"on the environment, people and/or property "]
[null,"Category 2 – significant impact or effect on the environment, people"]
[null,"and/or property "]
[null,"Category 3 – minor or minimal impact or effect on the environment, people"]
[null,"and/or property "]
[null,"Category 4 – substantiated incident with no impact."]