{"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":38,"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":57,"n_cols":6,"rows_kept":57,"cut":false,"hidden":false,"merged":[]}
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[null,"JOB TITLE",null,null,null,"Yorkshire Water IED Permit"]
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[null,"JOB NUMBER"]
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[null,"MADE BY",null,null,null,"Kiran Parmar"]
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[null,"CHECKED BY"]
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[null,"DATE",null,null,null,"2021-06-01"]
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[null,"Description of spreadsheet",null,null,null,"This spreadsheet provides a secondary containment risk assessment for Knostrop Sludge Treatment Facility (STF) using the Anaerobic Digestion and Biogas Association (ADBA) secondary containment risk assessment tool. "]
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[null,"Sheet Number prefix",null,null,null,""]
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[null,"Member/Location",null,null,null,""]
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[null,"Drawing Reference",null,null,null,""]
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[null,"Filename",null,null,null,{"$f":"IF(CELL(\"filename\")=\"\",\"\",LEFT(CELL(\"filename\"),FIND(\"]\",CELL(\"filename\"))))","v":{"$error":"#N/A"}}]
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[null,"CONTENTS OF SPREADSHEET"]
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[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 Knostrop STF is provided in the worksheet 1a) Source "]
[null,"1 b) Pathway",null,"The Pathway information for Knostrop STF is provided in the worksheet 1) b) Pathway "]
[null,"1 c) Receptors",null,"The Receptor information for Knostrop 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"]
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[null,"AUTHORISATION OF LATEST VERSION"]
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[null,"Type and method of check",null,null,null,"Review of method, inputs and assumptions"]
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[null,"Signatures & dates:",null,null,"Made by ","Kiran Parmar"]
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[null,null,null,null,"Checked "]
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[null,null,null,null,"Approved"]
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[null,"REVISIONS",null,null,"Current Revision ","Final"]
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[null,"Rev.","Date","Made by","Checked"," Description"]
[null,1,"2021-06-02","KP",null,"Source, Pathway Receptor, Likelihood Drafted"]
[null,"Final","2021-06-24","KP",null,"Comments incorportated"]

{"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]]}
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[null,"(1) Purpose of spreadsheet"]
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[null,"This spreadsheet outlines the information and data utilised, as well as the assumptions applied to undertake a secondary containment risk assessment for Knostrop 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."]
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[null,"(2) Key Assumptions"]
[null,"Any assumptions are outlined in the spreadsheet."]
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[null,"(3) Basis of calculations"]
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[null,"ADBA Risk Assessment tool."]
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[null,"(4) References"]
[null,"All references are outlined in the spreadsheet."]
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[null,"(5) Special features"]
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[null,null,"Input Cell"]
[null,null,"Key Outputs"]
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[null,"(6) Holds or items that require Clarification"]
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[null,"(7) Summary"]
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[null,"Best Practice Guide"]

{"sheet":"Introduction","index":2,"n_rows":75,"n_cols":9,"rows_kept":75,"cut":false,"hidden":false,"merged":[]}
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[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"]
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[null,"There are 5 steps to follow:"]
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[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"]
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[null,"2)","The Site Hazard Rating is derived by this tool from the combination of the hazards assessed above"]
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[null,"3)","Calculate the likelihood of a loss of primary containment event occurring"]
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[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"]
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[null,"5)","From the class of containment needed, identify suitable designs from the 'Standard Containment Designs' sheet"]
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[null,"Additional Guidance"]
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[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":90,"n_cols":16,"rows_kept":90,"cut":false,"hidden":false,"merged":[[5,13,5,15],[7,13,9,13],[4,13,4,18],[31,1,31,3]]}
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[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",540,"m3","Single sludge Screen Feed Tank (3 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,null,"Risk Quantification"]
[null,"Screened sludge liquid","Liquid",3855,"m3","Single Screened Sludge  Tank (3 years old) and Associated Pipework","Not flammable","No","Low","H","Permitted waste types are non-hazardous, low toxicity and the volume is significant",null,null,"Material","Volume (m3)","Environmental Hazard Rating"]
[null,"Indigenous sludge  ","Liquid",3855,"m3","Single Thickener Feed Tank (3 yrs old) and Associated Pipework","Not flammable","No","Low","H","Permitted waste types are non-hazardous, low toxicity and the volume is significant",null,null,"Wet Sludge","0-99","Low"]
[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,null,"100-999","Medium"]
[null,"Process",null,null,null,null,null,null,null,null,null,null,null,null,"1000+","High"]
[null,"Thickened Sludge","Liquid",5376,"m3","Single Digester Feed Tank 3 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",29224,"m3","Four Digesters at 7306 m3 each (3 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",5260,"m3","One Dewatering Feed Tank (3 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 Cake","Solid","Deposited quantity moved to cake barn within hours","m3","Digested Cake Storage and Loading Slab ","Not flammable","No","Low","M","Largely immobile therefore presents only a medium risk."]
[null,"Digested Cake","Solid",1700,"m3","Cake Barn","Not flammable","No","Low","M","Largely immobile therefore presents only a medium risk."]
[null,"Digested Sludge Liquors","Liquid",2212,"m3","Dewatering Liquors Balance Tank (3 yrs old)","Not flammable","No","Low","H","Permitted waste types are non-hazardous, low toxicity and the volume is significant"]
[null,"Digested Sludge Liquors","Liquid",270,"m3","Liquor treatment plant (3 yrs old)","Not flammable","No","Low","M","Permitted waste types are non-hazardous, low toxicity and the volume is below 1000m3"]
[null,"Digested Sludge Liquors","Liquid",4460,"m3","Two Liquor Treatment Reactors at 2230 m3 each (3 yrs old)","Not flammable","No","Low","H","Permitted waste types are non-hazardous, low toxicity and the volume is significant"]
[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"]
["Potentially need to add flocculant - stored in IBCs","Liquid polyelectrolyte – thickening plant","Liquid",20000,"L","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",1.2,"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",1.2,"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,"Lime ","Solid",74,"m3","Stored securely in Fibre Glass container","Not flammable","No",null,"L","Low ecotoxicity for the quantities stored"]
[null,"Powder polyelectrolyte – dewatering plant","Solid",37.6,"m3","Stored securely in Fibre Glass container","Not flammable","No",null,"L","Media is inert and largely immobile"]
[null,"Ferric sulphate","Solid",20000,"m3","Stored securely in Fibre Glass container","Not flammable","No",null,"L","Media is inert and largely immobile"]
[null,"Diesel","Liquid","2,500L","L","Stored in steel construction tank vessel","Flammable","Yes",null,"H","Diesel has a high rating. Used for machine maintenance, etc. and this is handled and stored appropriately. "]
[null,"Glycol (anti-freeze)","Liquid",1000,"L","IBC container","Not flammable","No",null,"M","Permitted material used for CHP"]
[null,"CHP lubricating oil","Liquid",3000,"L","Koronka Steel tank","Flammable","Yes",null,"H","Oil has a high rating. Used for machine maintenance, etc. and this is handled and stored appropriately. "]
[null,"CHP waste lubricating oil","Liquid",3000,"L","Koronka Steel tank","Not flammable","No",null,"H","Oil has a high rating. Used for machine maintenance, etc. 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 only very small volumes of oils kept of site and this is handled 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."]
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[null,null,null,null,null,null,null,null,"Spillages Overall Rating","L","All the hazards are \"Low\" therefore the overall rating is low"]
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[null,null,null,null,null,null,null,null,"Sources Overall Hazard Rating",{"$f":"IF(OR(J9=\"H\",J19=\"H\",J31=\"H\",J37=\"H\"),\"H\",IF(OR(J9=\"M\",J19=\"M\",J31=\"M\",J37=\"M\"),\"M\",\"L\"))","v":"H"}]
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["H"]
["M"]
["L"]

{"sheet":"1) b) Pathway","index":4,"n_rows":98,"n_cols":13,"rows_kept":98,"cut":false,"hidden":false,"merged":[[5,0,8,0]]}
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[null,null,null,null,null,null,"Postcode","LS9 0NX"]
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[null,"Pathway - the route from primary containment to receptor",null,null,"Environmental hazard rating ","Notes","Source","Description","Link","Image","Source","Description","Modelling"]
[null,"Site layout and drainage"]
[null,"If any of the site inventory has a runoff time of a few minutes…",null,null,"H","N/A"]
[null,"If any of the site inventory has a runoff time of a few hours.…",null,null,"H","N/A"]
[null,"If any of the site inventory has a runoff time of a few days…",null,null,"M","It is assumed the site inventory has a runoff time of a few days due to the form of sludge and the distance to the receptors. 2D modelling has been completed for Knostrop STF, this shows that in the event of catastrophic tank failure, no sludge has a direct route to watercourses. The physical property of sludge is of a slow flowing suspension and relatively immobile.","Yorkshire Water","Model output for failure of all tanks is included after column R"]
[null,"If any of the site inventory has a runoff time of a few weeks…",null,null,"L","N/A"]
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[null,"Topography, geology and hydrology"]
[null,"Made ground (artificial ground)",null,null,"M","A medium environmental hazard rating has been selected for  geology as the made ground is  0.53 to 3.4m thick. The filter media is indicated to comprise of predominantly sub rounded coarse gravel and occasional cobbles of sandstone, quartz, limestone and rare slag.","BGS","Made ground shown as per image.","http://mapapps2.bgs.ac.uk/geoindex/home.html",null,"Stantec (2021) Knostrop Wastewater\nTreatment Works Ground\nEngineering Desk Study\nReport - P12","A geotechnical desk study was undertaken in 2021 by Stantec.  Made Ground (Artificial Deposit) is shown to be present across the northern section of the site. The historical mapping indicates the presence of a former colliery (Waterloo Main\nColliery), earthworks and sewage treatment structures in the location of the recorded Made Ground. The historical mapping shows power station and sewage treatment related structures and possibly raised ground have historically been in this area. It is expected that variable and potentially significant thicknesses of Made Ground will be encountered across the site, given that the historical mapping shows various phases of development have occurred across the site, along with localised multiple industrial land uses."]
[null,"Clay/Terrace gravels - Superficial deposits - Secondary A aquifer",null,null,"M","Superficial Deposits are shown to be absent from across most of the site. Where superficial deposits are shown to be found,  across the eastern section of the site and beyond, this is made up of alluvium, comprising of gravel, sand, silt and clay. \nThe Alluvium appears to follow the historical alignment of Wyke Beck and  overlies the River Terrace Deposits. It is anticipated that where Alluvium is encountered, this will be underlain by the River Terrace Deposits.","BGS","Alluvium - Gravel, Sand, Silt and Clay overly the site as per the image. Normally soft to firm consolidated, compressible silty clay, but can contain layers of silt, sand, peat and basal gravel. ","http://mapapps2.bgs.ac.uk/geoindex/home.html",null,"Stantec (2021) Knostrop Wastewater\nTreatment Works Ground\nEngineering Desk Study\nReport - P12","Superficial Deposits are shown to be absent from across most of the site. Superficial Deposits are shown across the eastern section of the site and beyond and include:\nA linear strip of Alluvium which appears to follow the historical alignment of Wyke Beck (pre-modification and realignment). The BGS Lexicon (BGS, 2020) describes\nAlluvium as typically comprising compressible silty clay, but also containing layers of silt, sand, peat and basal gravels.\nRiver Terrace Deposits are shown across the eastern section of the site. The BGS Lexicon (BGS, 2020) describes River Terrace Deposits as comprising sand and gravel, locally with lenses of silt, clay or peat.\nThe Alluvium overlies the River Terrace Deposits. It is anticipated that where Alluvium is encountered, this will be underlain by the River Terrace Deposits."]
[null,"Pennine Middle Coal Measures Formation - Bedrock - Secondary A aquifer",null,null,"M","Bedrock in the site and surrounding areas are described as interbedded grey mudstone, siltstone and sandstone with numerous coal seams in the upper part of the site.","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,"Stantec (2021) Knostrop Wastewater\nTreatment Works Ground\nEngineering Desk Study\nReport - P12","The site and surrounding area is shown to be underlain by the Pennine Lower Coal Measures Formation, which is described by the BGS Lexicon (BGS, 2020) as interbedded grey mudstone, siltstone and sandstone with numerous coal seams in the upper part. Emley Rock is shown to outcrop immediately to the north of the site and is described by the BGS Lexicon as fine-grained flaggy sandstone with mudstone partings. No strata dip/strike information is available on the published geological mapping proximal to the site. Two coal seams are shown to underlie the site and include:\nMiddleton Main coal seam – outcrops along the northern site boundary and through the centre of the site, striking roughly northwest to southeast.\nMiddleton Little coal seam – outcrops and straddles the southern site boundarys. A north-east to south-west striking fault is shown adjacent to the northern site boundary. The downthrown side of the fault is indicated to the north. Further north-east to south-west striking faults are shown to the north/north-west of the site."]
[null,"Wyke Beck ",null,null,"H","The Wyke Beck runs along the north-eastern boundary of the site, flowing south-east to a confluence with the River Aire approximately 1.5 km to the south-east of the site. This waterbody has an overall Water Framework Directive (WFD) classification of 'Moderate', with an ecological status of 'Moderate' and  a chemical status of 'Fail'.  The Wyke Beck  will transport any contaminants that enter the river through surface water runoff, groundwater flow and other potential receptors downstream. There is potential for contaminants to be transported downstream to the RIver Aire from Gill Beck (Baildon) to River Calder.  Therefore, a High Environmental Hazard Rating has been selected.","Catchment Data Explorer","Ammonia, invertebrates and mitigation measures assessment are reasons for the waterbody failing to meet 'Good' ecological status. ","https://environment.data.gov.uk/catchment-planning/WaterBody/GB104027062880",null,"Stantec (2021) Knostrop Wastewater\nTreatment Works Ground\nEngineering Desk Study\nReport - P33","The River Aire is located broadly to the south of the site, approximately 350 m at its most proximal. Adjacent to the south of the River Aire is the Aire and Calder Navigation, a canalized run of the river. Both the River Aire and the navigation flow to the east, emptying into the River Ouse at Airmyn, approximately 38.5 km to the east of the site.\nThe Wyke Beck runs along the north-eastern boundary of the site, flowing south-east to a confluence with the River Aire approximately 1.5 km to the south-east of the site.\nContemporary mapping indicates two unnamed drains, originating within the wider WwTW. These channels are both located approximately 550 m to the south of the site, inferred as\nflowing to Wyke Beck."]
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[null,"Mitigation - do these apply?"]
[null,"Secondary containment systems and other mitigations:\n\nThe site has significant areas of hardstanding, particularly around the main digestion tanks.  Grassed areas have easy access to allow for clean up in the event of a spill.\n "]
[null,"Design, construction and maintenance controls on tanks and other site assets ensure they are built by competent contractors using good quality materials to a high standard.  The condition of tanks is then monitored throughout their life.  This controls the risks of tank failure"]
[null,"There are geo-environmental barriers underlying the site such as made ground and clay. "]
[null,"All site drainage returns to the wastewater treatment works.  This provides a rapid route for spills to leave site in an environmentally safe way."]
[null,"Spill modelling for Knostrop  STF identifies all sludge would be retained in safe areas in the event of a multi tank catastrophic failure.  For more information, see the secondary containment report written as part of permit application\n"]
[null,null,null,"Path & Mitigation Overall Rating","M","Justification:\nThe majority of pathways receive a medium risk score.  The exception is Wyke Beck, which is a receptor, but also a pathway that could carry pollutants to environmentally sensitive areas. \nThe mitigations in place mean that sludge is highly unlikely to reach Wyke Beck.  In turn, this means it's effectiveness as a pathway is reduced and a medium score is justified."]
[null,"Climatic conditions"]
[null,"Annual rainfall < 1000 mm",603.20000000000005,null,"L"," - The annual rainfall is less than 1,000 mm","Met  Office","UK climate averages","https://www.metoffice.gov.uk/research/climate/maps-and-data/uk-climate-averages/gcx4kb837"]
[null,"Fire Fighting Water"]
[null,"Flammable materials normally present on site in large quantities",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. "]
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[null,"Location"]
[null,"Flooding",null,null,"L","The STF is in a Flood Zone 1, therefore a low environmental hazard rating has been selected. ","EA Flood Map for Planning","All of the Knostrop site is Flood zone 1 and has a low probability of flooding.","https://flood-map-for-planning.service.gov.uk/summary?easting=433828&northing=431708",null,"Stantec (2021) Knostrop Wastewater\nTreatment Works Ground\nEngineering Desk Study\nReport - P32","The Environment Agency’s Flood Map for Planning shows that the site is located within a Flood Zone 1, indicating a less than 1 in 1,000 (<0.1%) annual probability of flooding from rivers and the sea.\nThe site is not shown generally to be at risk of surface water flooding, however various tanks and filter beds are shown to be shaded indicating Low to High likelihood of flooding: Low means a 1 in 1,000 (<0.1%) annual probability of flooding, High means a >1 in 30 (3.3%)\nannual probability of flooding."]
[null,"Site is connected to a Wastewater Treatment Works",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.  If site capacity were exceeded 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.",null,null,"L","The former filter bed site adjacent to the main digestion area is currently being redeveloped as a distribution warehouse with associated lorry parking.  Based on finished level information from the planning application, the site will be approx. 2m lower than the digestion area.  Data used for spill modelling is representative of expected site finish levels.","Planning application references:\n\n19/07896/RM\n20/9/00264/MOD\n20/07784/RM\n"]
[null,null,null,"Site Considerations  Overall Rating","L"]
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[null,null,null,"Pathway Overall Hazard Rating",{"$f":"IF(OR(E24=\"H\",E34=\"H\"),\"H\",IF(OR(E24=\"M\",E34=\"M\"),\"M\",\"L\"))","v":"M"}]
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["L"]

{"sheet":"1) c) Receptors","index":5,"n_rows":98,"n_cols":16,"rows_kept":98,"cut":false,"hidden":false,"merged":[]}
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[null,null,null,null,null,null,null,null,"Postcode","LS9 0NX"]
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[null,"Receptors","Within","units",null,null,"Environmental hazard rating ","Notes","Source","Description","Link","Image","Source","Description","Source","Description"]
[null,"Watercourses and bodies"]
[null,"Wyke Beck",130,"m",null,null,"H","Wyke Beck (watercourse) is 10 km in length and is shown approximately 130 m to\nthe north-east of the site boundary, running from north to south. Water voles, European bullhead, trout and white-clawed crayfish are known to have been present on the beck. The Wyke Beck runs along the north-eastern boundary of the site, flowing south-east to a confluence with the River Aire approximately 1.5 km to the south-east of the site. This waterbody has an overall Water Framework Directive (WFD) classification of 'Moderate', with an ecological status of 'Moderate' and  a chemical status of 'Fail'. Ammonia, invertebrates and mitigation measures assessment are reasons for the waterbody failing to meet 'Good' ecological status. ","Wikipedia","The water quality of the beck has been recorded as Moderate for ecological status and Good for its chemical composition. In the early 2010s, the Wyke Beck was failing on its chemical status. The Environment Agency has set a target of 2027 for the beck to be registered as having an overall quality of Good. Water voles, European bullhead, trout and white-clawed crayfish are known to have been present on the beck. The population of native crayfish in the beck (and also at nearby Meanwood Beck) has been described as strong, so much so that some were removed to Pudsey Beck to form an ark.","https://en.wikipedia.org/wiki/Wyke_Beck#cite_note-30",null,"Stantec (2021) Knostrop Wastewater\nTreatment Works Ground\nEngineering Desk Study\nReport - P9","The site is bound to the northeast by the WwTW with the watercourse Wyke Beck\nbeyond, which runs adjacent to the WwTW north eastern boundary. Beyond Wyke Beck is\nopen land, a petrol station and a park and ride facility."]
[null,"Clay/Terrace gravels - Superficial deposits - Secondary A aquifer","beneath site","m",null,null,"M","The superficial deposits of River Terrace Deposits are classified as a Secondary A Aquifer, therefore, a medium environmental hazard rating is given.  The site is not located within a groundwater Source Protection Zone (SPZ). \n\nSite condition reports and MAGIC has shown that that 'Area A' is partially over  built over superficial deposits (unconsolidated sediments such as\ngravel, sand, silt and clay). ","MAGIC Landscape Geology and Soils Aquifer Designation Map (Superficial) (England) \n\n","Secondary A Classification as per image","https://magic.defra.gov.uk/MagicMap.aspx",null,"Stantec (2021) Knostrop Wastewater\nTreatment Works Ground\nEngineering Desk Study\nReport - P22","The site is not located within a groundwater Source Protection Zone (SPZ).\nThe site is not located within a groundwater drinking water safeguard zone (Environment\nAgency, 2020). Two groundwater strikes were recorded in the intact Coal Measures in SE33SW1256 to 1260\n(located in the north of the site), with the first strike recorded in within 8 mBGL and the second\nstrike recorded between 11.7 m and 13.7 mBGL. Single groundwater strikes were recorded\nin the remaining locations.","Stantec (2021) Knostrop Wastewater\nTreatment Works Ground\nEngineering Desk Study\nReport - Appendix B. Envirocheck Report (Separately bound)"]
[null,"Pennine Middle Coal Measures Formation - Bedrock - Secondary A aquifer","beneath site","m",null,null,"M","Pennine Lower Coal Measures Formation are classified by the Environment Agency as a Secondary A Aquifer. Classified as a Secondary aquifer (A), therefore a medium environmental hazard rating.  The site is not located within a groundwater Source Protection Zone (SPZ).","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,"Stantec (2021) Knostrop Wastewater\nTreatment Works Ground\nEngineering Desk Study\nReport - P22","The site is not located within a groundwater Source Protection Zone (SPZ).\nThe site is not located within a groundwater drinking water safeguard zone (Environment\nAgency, 2020). Two groundwater strikes were recorded in the intact Coal Measures in SE33SW1256 to 1260\n(located in the north of the site), with the first strike recorded in within 8 mBGL and the second\nstrike recorded between 11.7 m and 13.7 mBGL. Single groundwater strikes were recorded\nin the remaining locations."]
[null,"Groundwater Abstractions",null,null,null,null,"M","The MAGIC map shows that there are three source protection zones within 7500 m of the STW site, with the closest being 5300 m. Stantec (2021) Knostrop Wastewater Treatment Works Ground Engineering Desk Study Report shows that there are two active GW abstractions operating within 500 m of the site. Therefore, the hazard rating has been set as medium.","MAGIC Source Protection Zones merged (England)\n\n","Three groundwater source abstraction within 7500 m of the STW site. With the closest being 5300 m","https://magic.defra.gov.uk/MagicMap.aspx",null,"Stantec (2021) Knostrop Wastewater\nTreatment Works Ground\nEngineering Desk Study\nReport - P36","There are two active abstractions from groundwater located within 500 m of the site, as\nfollows:\n- Stocks Bros Ltd have a licence, located approximately 345 m to the north-west of the site, abstracting groundwater from the Pennine Lower Coal Measures Formation for mineral products processing. No volume is provided. The permit began in April 2020.\n- Pittards PLC have a licence, located approximately 345 m west of the site, abstracting water from the ‘Coal Measures’, to a volume of 511,000 m3 annually for textiles and leather general use. The permit began in 1998; the permit end date is not provided."]
[null,"WwTWs",50,"m",null,null,"L","The WwTWs is  very large and it would take a very significant spill to affect operation."]
[null,null,null,null,null,"Water Overall Rating","H","Justification: Wyke Beck has been attributed a High Environmental Hazard Rating"]
[null,"Habitation"]
[null,"Dwelling",950,"m",null,null,"L","The nearest dense area of residential properties is located 950 m from Knostrop STW. Therefore, this is a low environment hazard.","Leeds City Council Planning Map","A map to show residential properties and planning permissions","https://publicaccess.leeds.gov.uk/online-applications/spatialDisplay.do?action=display&searchType=Application"]
[null,"Meadowfield Primary School",1380,"m",null,null,"L","Meadowfield Primary School is situated approximately 1380 m from Knostrop STW and therefore is a low risk.","Google maps","Meadowfield Primary School, Halton Moor Avenue, Leeds, LS9 0JY\nPrimary\nDistance 1.38km (N)"]
[null,"Temple Learning Academy",1570,"m",null,null,"L","Temple Learning Academy is situated approximately 1570 m from Knostrop STW and therefore is a low risk.","Google maps","Temple Learning Academy, Neville Road, Leeds, LS15 0NN\nPrimary and Secondary\nDistance 1.57km (NNE)"]
[null,"Low Road Primary School",2100,"m",null,null,"L","Low Road Primary School is situated approximately 2100 m from Knostrop STW and therefore is a low risk.","Google maps","Low Road Primary School, Belinda Street, Leeds, LS10 2PS\nPrimary\nDistance 2.1km (W)\n"]
[null,"Corpus Christi Catholic Primary School",1689,"m",null,null,"L","Corpus Christi Catholic Primary School is situated approximately 1689 m from Knostrop STW and therefore is a low risk.","Google maps","Corpus Christi Catholic Primary School, Halton Moor Avenue, Leeds, LS9 0HA\nPrimary\nDistance 1.689 km (NNE)"]
[null,"Corpus Christi Catholic College",1680,"m",null,null,"L","Corpus Christi Catholic College is situated approximately 1680 m from Knostrop STW and therefore is a low risk.","Google maps","Corpus Christi Catholic College, Neville Road, Leeds, LS9 0TT\nSecondary\nDistance 1.68km (NNE)"]
[null,"South Leeds Primary Care Trust",2000,"m",null,null,"L","South Leeds Primary Care Trust situated approximately 2000 m from Knostrop STW and therefore is a low risk.","Free Map Tools","South Leeds Primary Care ","https://www.freemaptools.com/find-uk-hospitals-inside-radius.htm"]
[null,null,null,null,null,"Habitation Overall Rating","L","Justification: All habitats are approximately 1000m +  away from Knostrop STW"]
[null,"Other"]
[null,"Halton Moor Local Nature Reserve",820,"m",null,null,"L","Halton moor LNR is situated approximately 826 meters from Knostrop STW and therefore is a low risk.","MAGIC Map - Local Nature Reserves (England)","Halton moor LNR is situated approximately 826 meters from Knostrop STW","https://magic.defra.gov.uk/MagicMap.aspx"]
[null,"Tree Preservation Orders",795,"m",null,null,"L","The nearest Tree Preservation Order (PSO) is 795 m situated at the West of the site. Therefore this is a low environmental risk"," Tree Preservation Orders Map","There are 5 areas of TPO's. Closest being 795 meters west of the site.","https://leedscc.maps.arcgis.com/apps/MapSeries/index.html?appid=daeefe7a292b4f80a0ee284afe0926e4"]
[null,null,null,null,null,"Other Overall Rating","L","Justification: Receptors have low risk rating"]
[]
[]
[null,null,null,null,null,"Receptors Overall Hazard Rating",{"$f":"IF(OR(G11=\"H\",G20=\"H\",G24=\"H\"),\"H\",IF(OR(G11=\"M\",G20=\"M\",G24=\"M\"),\"M\",\"L\"))","v":"H"}]
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["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,{"$f":"'1) a) Source'!J40","v":"H"},{"$f":"'1) b) Pathway'!E37","v":"M"},{"$f":"'1) c) Receptors'!G27","v":"H"},{"$f":"IF(E106<6,\"Low\",IF(E106<10,\"Medium\",\"High\"))","v":"High"}]
[]
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[]
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[]
[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"]
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[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":2},{"$f":"VLOOKUP(D6,B101:C103,2,FALSE)","v":3},{"$f":"B106*C106*D106","v":18}]

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[null,"Risk #","Description of Risk","UNMITIGATED LIKELIHOOD \n","Mitigation applied","MITIGATED LIKELIHOOD","Low","Site Overall Likelihood"]
[null,"Sludge Screen Feed Tank\n","Containment:\n - Steel tank construction. Constructed in 2018 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- 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- The 2D modelling shows that spillage leads to a nearby receptor.","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 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. Connection to the tank is controlled by WASPE loggers, only authorised staff can discharge at the site.  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 extracted 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 2018 with an asset life of 20 years. Likelihood of emissions due to age is 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 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 screen feed pipe and screened sludge pipe are above ground and over impermeable surfacing that falls to the site drainage\n-Sludge screens are contained within a water-tight trough situated over 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 regular 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 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.   This is designed and maintained to the Yorkshire Water specifications, including scheduled inspection of pipe condition. 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 2018 with an asset life of 20 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 - Access to cake reception units is controlled via WaSP system.  Only authorised drivers can unload\n- High level alarms linked to site SCADA control program and interlock to stop wetting of cake and 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- Physical property of cake is a thixotropic fluid and relatively immobile. This limits the risk of cake flowing to off-site receptors and facilitates clean-up if a spill was to happen. \n- The unit is surrounded by impermeable hardstanding which drains to the drainge return pumping station which would return spills to the WwTW for treatment","M","N/A","L"]
[null,null,"Failure risk:"]
[null,null," - Catastrophic tank failure - The system is new and designed to contain a relatively low volume. Yorkshire Water have never experienced catastrophic failure of 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 - 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 low"]
[null,null,"- Fire, explosion - The reception unit has been designed together 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 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 - Reception unit is constructed in 2018 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 regular 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 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. 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.   This is designed and maintained to the Yorkshire Water specifications, including scheduled inspection of pipe condition. 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,"- 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 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.  Likelihood of emissions due to Geological issues is low"]
[null,null,"- Ageing - The pipework was installed in 2018 with an asset life of 20 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,"Thickener Feed Tank / Screened sludge tank\n\n\nSpillage of non hazardous sludge: \n - catastrophic failure of tank\n - tank overflow or\n - tank leaks.","Containment:\n - GRP coated steel with GRP roof. Constructed in 2018 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 designed with force ventilation ductwork connected to an odour control unit \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 regular 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 tank is new and Yorkshire Water have never experienced catastrophic failure of concrete tanks build and maintained to the YWS specifications.  Based on the CIRIA risk criteria for concrete 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 are trained to operate plant items. No risk of overflow, due to level monitors and the interlock on feed pumps. HAZOP studies have been undertaken as part of the design process. 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 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 tanks were designed with geotechnical design input.  Likelihood of emissions due to Geological issues is low"]
[null,null,"- Ageing - Tank constructed in 2018 with a 20yr asset life. . Likelihood of emissions due to age in low"]
[null,null,"- Lightning strike - The tanks are fitted with lightning protection system.  Likelihood of emissions due to Lightning is low"]
[null,"Pipework associated with the thickener feed tank and drum thickeners\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- The thickener feed tank outlet pipework runs above ground over impermeable surfacing that drains to the site drainage\n- The drum thickeners within a water-tight trough situated over 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 regular and visually inspected weekly. \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.   This is designed and maintained to the Yorkshire Water specifications, including scheduled inspection of pipe condition. 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 thickener feed pumps and thickened sludge 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. 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 is located away from 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. 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 2018 with an asset life of 20 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,"Digester Feed Tank\n\n\nSpillage of non hazardous sludge: \n - catastrophic failure of tank\n - tank overflow or\n - tank leaks.","Containment:\n - GRP/steel tank construction. Constructed in 2018 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 regular 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 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 concrete 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 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 2018 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 feed tanks\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 regular and visually inspected weekly. \n - Site is manned 7 days per week for 12 hours per day.\n - Non Destructive Testing is carried out every 5 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.   This is designed and maintained to the Yorkshire Water specifications, including scheduled inspection of pipe condition. 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.  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. 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 2018 with an asset life of 20 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 - Concrete tank construction. Constructed in 2018 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 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 regular and visually inspected weekly. \n - Site is manned 7 days per week for 12 hours per day.\n - Tank will be emptied and full inspection completed every 10 years.  This will include associated mechanical equipment and replacement of process instrumentation. \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 and generate a flammable atmosphere within the headspace.  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 2018 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 regular and visually inspected weekly. \n - Site is manned 7 days per week for 12 hours per day.\n - Non Destructive Testing is carried out every 5 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.   This is designed and maintained to the Yorkshire Water specifications, including scheduled inspection of pipe condition. 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,"- 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 pipework is 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 and generate a flammable atmosphere within the headspace.  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,"- Lightning strike - Lightning protection risk assessment carried out and lightning protection installed. Likelihood of emissions due to Lightning is low."]
[null,"Dewatering feed 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 2018 with a 30yr 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 control 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 regular 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 tank is new and of relatively low volume. Yorkshire Water have never experienced catastrophic failure of steel 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 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 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 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 - Tank constructed in 2018 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 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 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 regular and visually inspected weekly. \n - Site is manned 7 days per week for 12 hours per day.\n - Non Destructive Testing is carried out every 5 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.   This is designed and maintained to the Yorkshire Water specifications, including scheduled inspection of pipe condition. 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 is protected by road kerbs and access is restricted within the digester 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 low"]
[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. 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 2018 with an asset life of 20 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,"Lime vessel\n\nSpillage of non hazardous sludge: \n - catastrophic failure of tank\n - tank overflow or\n - tank leaks.","Containment:\n - Stainless steel tank construction. Constructed in 2018 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 has an 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 regular 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- 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 new and of relatively low volume. Yorkshire Water have never experienced catastrophic failure of steel 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 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 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 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 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 - Tank constructed in 2018 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 lime vessel\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 regular and visually inspected weekly. \n - Site is manned 7 days per week for 12 hours per day.\n - Non Destructive Testing is carried out every 5 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.   This is designed and maintained to the Yorkshire Water specifications, including scheduled inspection of pipe condition. 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 - the pipework is not routed along areas of Potential 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 pipework was designed with geotechnical design input.  Likelihood of emissions due to Geological issues is low"]
[null,null,"- Ageing - The pipework was installed in 2018 with an asset life of 20 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 storage, loading slab and barn\n\n\nEmission of sludge solids from the conditioning pads\nLeaching of liquors to groundwater","Containment:\n- Dewatered digested sludge cake is stored on impermeable concrete surface within cake barn .\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 regular and visually inspected weekly. \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, 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 relevant tanker 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 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 low"]
[null,null,"Fire, explosion - The area well ventilated and 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 slab area was constructed in 2018 with an asset life of 20 years due to heavy loads. Likelihood of emissions due to age is 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,"Dewatering Liquors Balance 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 2018 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 surrounded by impermeable hardstanding which drains to the liquors return pumping station which would return spills for treatment","M"," - Tanks visually inspected weekly. \n - TCM checks are conducted regular 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. Yorkshire Water have never experienced catastrophic failure of steel 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 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 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 - 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 but treated liquors will not generate flammable conditions.  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 2018 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 dewatering liquors balance tank\n\n - Spillage of non hazardous sludge: catastrophic failure and leaks from pipework.","Containment: \n- All pipelines, valves are made from steel\n- Dewatering liquors balance tank inlet pipework are above ground and over impermeable surfacing that falls to the site drainage. \n- Dewatering feed tank outlet pipework runs below ground between the transfer pump and  \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 regular and visually inspected weekly. \n - Site is manned 7 days per week for 12 hours per day.\n - Non Destructive Testing is carried out every 5 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 medium likelihood of significant leakage.  The potential for emission is therefore considered medium."]
[null,null," - Leaks from underground pipework would be emitted to ground.   This is designed and maintained to the Yorkshire Water specifications, including scheduled inspection of pipe condition. 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 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 - the pipework is not routed along areas of Potential 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 pipework was designed with geotechnical design input.  Likelihood of emissions due to Geological issues is low"]
[null,null,"- Ageing - The pipework was installed in 2018 with an asset life of 20 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,"LTP Reactor 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. Constructed in 2018 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 surrounded by impermeable hardstanding which drains to the liquors return pumping station which would return spills for treatment","M"," - Tanks visually inspected weekly. \n - TCM checks are conducted regular 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.  - 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. Yorkshire Water have never experienced catastrophic failure of steel 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 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 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 - 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 but treated liquors will not generate flammable conditions.  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 2018 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 LTP Reactor Tanks\n\n - Spillage of non hazardous sludge: catastrophic failure and leaks from pipework.","Containment: \n- All pipelines, valves are made from steel\n- Dewatering liquors balance tank inlet pipework are above ground and over impermeable surfacing that falls to the site drainage. \n- Dewatering feed tank outlet pipework runs below ground between the transfer pump and  \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 regular 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 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 medium likelihood of significant leakage. . The potential for emission is therefore considered medium."]
[null,null," - Leaks from underground pipework would be emitted to ground.   This is designed and maintained to the Yorkshire Water specifications, including scheduled inspection of pipe condition. 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 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 - the pipework is not routed along areas of Potential 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 pipework was designed with geotechnical design input.  Likelihood of emissions due to Geological issues is low"]
[null,null,"- Ageing - The pipework was installed in 2018 with an asset life of 20 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,"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.  \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 regular 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 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 2018  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 dewatering.  \n - Polyelectrolyte will be stored in steel silos and/or IBCs 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 regular 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.  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. IBC's have been employed as emergency temprory storage due to Brexit supply issus, once supply certainty has been restored  emergency storage will be revoked.  Likelihood of emissions due to impacts low\n"]
[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 2018 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,"Ferric Sulphate Storage\n\n\nEmission of chemical with low ecotoxicity\nLeaching to groundwater","Containment:\n- Ferric sulphate is a two 10 m3 capacity fibre glass tanks with appropriate spill containment as per YW asset standards.\n","M"," - Tank is bunded\n - Tanks visually inspected weekly. \n - TCM checks are conducted regular 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 and containers 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 low"]
[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 and acid tank. 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 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 containers are new 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"]
[null,"Lime Storage\n\n\nEmission of chemical with low ecotoxicity\nLeaching to groundwater","Containment:\n- Lime storage is a 74 m3 capacity fibre glass tank with appropriate spill containment as per YW asset standards.\n","M"," - Bulk storage of lime is in powder form, reducing potential for it to flow if tank is damaged\n - Tanks visually inspected weekly. \n - TCM checks are conducted regular 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 and containers 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 low"]
[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 and acid tank. 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 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 containers are new 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"]
[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 regular and visually inspected weekly. \n - Site is manned 7 days per week for 12 hours per day.\n - Non Destructive Testing is carried out every 5 years 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 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,"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","- Oil is stored on a bunded pallet, or in a bunded area\n- Tank is visually inspected weekly. \n - TCM checks are conducted regular and visually inspected weekly. \n - Site is manned 7 days per week for 12 hours per day.\n - Non Destructive Testing is carried out every 5 years 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 2018 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":109,"n_cols":5,"rows_kept":109,"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"},{"$f":"IF(D109<3,\"Low\",IF(D109<5,\"Medium\",\"High\"))","v":"Medium"},{"$f":"IF(D6=\"Low\",\"Class 1\",IF(D6=\"Medium\", \"Class 2\",\"Class 3\"))","v":"Class 2"}]
["Sludge Screen Feed Tank\n","High","Low","Medium",{"$f":"IF(D7=\"Low\",\"Class 1\",IF(D7=\"Medium\", \"Class 2\",\"Class 3\"))","v":"Class 2"}]
["Pipework associated with the sludge import tanks and sludge screens","High","Low","Medium","Class 2"]
["Cake Reception","High","Low","Medium","Class 2"]
["Pipework associated cake reception, rewetting and transfer systems","High","Low","Medium","Class 2"]
["Thickener Feed Tanks","High","Low","Medium","Class 2"]
["Pipework associated with the thickener feed tanks","High","Low","Medium","Class 2"]
["Digester Feed Tanks","High","Low","Medium","Class 2"]
["Pipework associated with the digester feed tanks","High","Low","Medium","Class 2"]
["Digesters","High","Low","Medium","Class 2"]
["Pipework associated with the digesters","High","Low","Medium","Class 2"]
["Digested Sludge Transfer Tank","High","Low","Medium","Class 2"]
["Pipework associated with the digested sludge transfer tank","High","Low","Medium","Class 2"]
["Digested Sludge Transfer Pipework","High","Low","Medium","Class 2"]
["Dewatering Feed Tank","High","Low","Medium","Class 2"]
["Pipework associated with the dewatering feed tank","High","Low","Medium","Class 2"]
["Digested Cake Pad","High","Low","Medium","Class 2"]
["Dewatering Liquors Balance Tank","High","Low","Medium","Class 2"]
["Pipework associated with the dewatering liquors balance tank","High","Low","Medium","Class 2"]
["LTP Reactor Tanks","High","Low","Medium",{"$f":"IF(D25=\"Low\",\"Class 1\",IF(D25=\"Medium\", \"Class 2\",\"Class 3\"))","v":"Class 2"}]
["Pipework associated with the  LTP Reactor Tanks","High","Low","Medium",{"$f":"IF(D26=\"Low\",\"Class 1\",IF(D26=\"Medium\", \"Class 2\",\"Class 3\"))","v":"Class 2"}]
["Polyelectrolyte Storage (Thickening)","High","Low","Medium","Class 2"]
["Polyelectrolyte Storage (Dewatering)","High","Low","Medium","Class 2"]
["Ferric Sulphate Storage","High","Low","Medium","Class 2"]
["Lime Storage"]
["Anti-Foam Storage","High","Low","Medium","Class 2"]
["Lubricating Oil Storage","High","Low","Medium","Class 2"]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
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[]
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[]
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[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
["Rating lookup table"]
["Low",1]
["Medium",2]
["High",3]
[]
["This assessment score"]
[{"$f":"VLOOKUP(B6,A104:B106,2,FALSE)","v":3},{"$f":"VLOOKUP(C6,A104:B106,2,FALSE)","v":1},null,{"$f":"A109*B109","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."]