{"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":28,"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":[]}
[]
[]
[]
[]
[null,"JOB TITLE",null,null,null,"Yorkshire Water IED Permit"]
[]
[null,"JOB NUMBER"]
[]
[null,"MADE BY",null,null,null,"Kiran Parmar"]
[]
[null,"CHECKED BY"]
[]
[null,"DATE",null,null,null,"2022-02-02"]
[]
[null,"Description of spreadsheet",null,null,null,"This spreadsheet provides a secondary containment risk assessment for Caldervale Sludge Treatment Facility (STF) using the Anaerobic Digestion and Biogas Association (ADBA) secondary containment risk assessment tool. "]
[]
[null,"Sheet Number prefix",null,null,null,""]
[]
[null,"Member/Location",null,null,null,""]
[]
[null,"Drawing Reference",null,null,null,""]
[]
[null,"Filename",null,null,null,{"$f":"IF(CELL(\"filename\")=\"\",\"\",LEFT(CELL(\"filename\"),FIND(\"]\",CELL(\"filename\"))))","v":{"$error":"#VALUE!"}}]
[]
[]
[null,"CONTENTS OF SPREADSHEET"]
[]
[null,"Sheet",null,"Description"]
[null,"Cover"]
[null,"Notes"]
[null,"Introduction",null,"Introduction to the ADBA Tool"]
[null,"1 a) Source",null,"The inventory of materials for Caldervale STF is provided in the worksheet 1a) Source "]
[null,"1 b) Pathway",null,"The Pathway information for Caldervale STF is provided in the worksheet 1) b) Pathway "]
[null,"1 c) Receptors",null,"The Receptor information for Caldervale  STF is provided in the worksheet 1) c) Receptor."]
[null,"2) Site Hazard Rating",null,"The Site Hazard Rating is displayed in the worksheet 2) Site Hazard Rating"]
[null,"3) Likelihood",null,"The likelihood of loss of primary containment and the associated mitigation."]
[null,"4) Site Risk and Classification",null,"The Site Hazard Rating and Classification is in this worksheet"]
[null,"5) Standard Containment Design",null,"The Standard Containment Design is in this worksheet"]
[]
[]
[]
[]
[null,"AUTHORISATION OF LATEST VERSION"]
[]
[null,"Type and method of check",null,null,null,"Review of method, inputs and assumptions"]
[]
[null,"Signatures & dates:",null,null,"Made by ","Kiran Parmar"]
[]
[null,null,null,null,"Checked "]
[]
[null,null,null,null,"Approved"]
[]
[null,"REVISIONS",null,null,"Current Revision "]
[]
[null,"Rev.","Date","Made by","Checked"," Description"]
[null,"V1","2022-03-07","KP","SW"]
[null,"V2","2023-11-10","KP","SW","Amendments"]

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

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

{"sheet":"1) a) Source","index":3,"n_rows":41,"n_cols":15,"rows_kept":41,"cut":false,"hidden":false,"merged":[[27,1,27,3],[3,12,3,14],[5,12,7,12]]}
[]
[]
[]
[null,"Material","Material","Total Enclosed Quantity","units","Storage","Flammability","Corrosive","Ecotoxicity (based on LD and quantity)","Environmental hazard rating ","Justification",null,"Risk quantification"]
[null,"Feedstock",null,null,null,null,null,null,null,null,null,null,"Material","Volume (m3)","Environmental Hazard Rating"]
[null,null,null,null,null,null,null,null,null,null,null,null,"Wet Sludge","0-99","Low"]
[null,"Imported and indigenous primary sludge liquid","Liquid",140,"m3","Primary and imported sludge reception tank (10 yrs old) and associated pipework","Not flammable","No","Low","M","Permitted waste types are non-hazardous however the volume is below 1,000m3.",null,null,"100-999","Medium"]
[null,"Screened indigenous primary and sludge and imported sludge liquid","Liquid",1760,"m3","Two sludge thickening feed tanks  (41 and 42 yrs old) and associated pipework","Not flammable","No","Low","H","Permitted waste types are non-hazardous however the volume is significant.",null,null,"1000+","High"]
[null,"Indigenous secondary sludge","Liquid",2150,"m3","SAS storage tank (20 yrs old)","Not flammable","No","Low","H","Permitted waste types are non-hazardous however the volume is significant."]
[null,null,null,null,null,null,null,null,"Feedstock Overall Rating","H","Any material with a \"High\" rating means the overall rating is High"]
[null,"Process"]
[null,"Thickened sludge","Liquid",1330,"m3","Two digester feed tanks (41 and 18 yrs old) and associated pipework","Not flammable","No","Low","H","Permitted waste types are non-hazardous however the volume is significant."]
[null,"Digesting sludge","Liquid",3510,"m3","Two digesters (42 and 43 yrs old) and associated pipework","Not flammable","No","Low","H","Permitted waste types are non-hazardous however the volume is significant."]
[null,"Digested sludge","Liquid",628.4,"m3","Two digested sludge holding tanks (18 and 20 yrs old) and associated pipework","Not flammable","No","Low","M","Permitted waste types are non-hazardous however the volume is below 1,000m3."]
[null,"Digested cake","Solid",4000,"Tonnes"," Cake pad ","Not flammable","No","Low","M","Largely immobile therefore presents only a medium risk."]
[null,"Digested  sludge liquors","Liquid",462.5,"m3","Return liquors balance tank (22 yrs old) and associated pipework","Not flammable","No","Low","M","Permitted waste types are non-hazardous however the volume is below 1,000m3."]
[null,null,null,null,null,null,null,null,"Process Overall Rating","H","Any material with a \"High\" rating means the overall rating is High"]
[null,"Additives and site chemicals"]
[null,"Liquid polyelectrolyte – SAS thickening plant (bulk storage and holding)","Liquid",8,"m3","Stored in tanks and bunded as per YW asset standards","Not flammable","No",null,"M","Majority of material stored  internally within a building. IBCs are stored close to the building and away from access road."]
[null,"Powder polyelectrolyte – dewatering plant","Solid",750,"kg","Stored above dedicated hopper and bunded as per YW asset standards","Not flammable","No",null,"L","Low ecotoxicity for the quantities stored"]
[null,"Made up polyelectrolyte – GBT and  dewatering plant (feed and stock)","Solid",9.5,"m3","Stored in tanks and bunded as per YW asset standards","Not flammable","No",null,"L","Low ecotoxicity for the quantities stored"]
[null,"Lubricating oil","Liquid","Small amounts",null,"Fresh or waste oil is stored as per YW asset standards","Flammable","Yes",null,"H","Oil has a high rating volumes used for machine servicing are taken onto and off site when required, with small amounts held in small containers within the installation."]
[null,"Diesel - Vehicle fuel for  \nfront loader  ","Liquid",1,"m3","Stored securely and bunded as per YW EMS procedures","Flammable","Yes",null,"H","Diesel has a high rating however there are only very small volumes and stored outside the installation area, used for machinery at any one time, etc. and this is handled and stored appropriately by an external contractor."]
[null,"Gas oil - backup boiler fuel","Liquid",15,"m3","Stored securely and bunded as per YW EMS procedures","Flammable","Yes",null,"H","Gas oil has a high rating however there are only very small volumes and stored outside the installation area, used for machinery at any one time, etc. and this is handled and stored appropriately by an external contractor."]
[null,"Antifoam","Liquid",0.5,"m3","Stored securely and bunded as per YW EMS procedures","Not flammable","No",null,"L","Low ecotoxicity for the quantities stored"]
[]
[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. IBCs are not kept within buildings and only very small volumes of oils kept on 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 example in the ADBA Tool."]
[null,"Fire fighting and cooling water contaminated by inventory",null,null,null,null,"Not flammable","No","Low","L","Low in the example in the ADBA Tool."]
[]
[]
[null,null,null,null,null,null,null,null,"Spillages Overall Rating","L","All the hazards are \"Low\" therefore the overall rating is low"]
[]
[]
[null,null,null,null,null,null,null,null,"Sources Overall Hazard Rating",{"$f":"IF(OR(J10=\"H\",J17=\"H\",J33=\"H\"),\"H\",IF(OR(,J27=\"M\"=\"M\"),\"M\",\"L\"))","v":"H"}]
[]
[]
["H"]
["M"]
["L"]

{"sheet":"1) b) Pathway","index":4,"n_rows":101,"n_cols":17,"rows_kept":101,"cut":false,"hidden":false,"merged":[]}
[]
[null,null,null,null,null,null,null,"Postcode","WF1 5PJ"]
[]
[null,"Pathway - the route from primary containment to receptor",null,null,null,"Environmental hazard rating ","Notes","Source","Description","Link","Image","Source","Description","Source","Description","Source","Description"]
[null,"Site layout and drainage"]
[null,"If any of the site inventory has a runoff time of a few minutes…",null,null,null,null,"N/A  - Run-off time is an estimate of how long it would take to flow to the nearest receptor."]
[null,"If any of the site inventory has a runoff time of a few hours.…",null,null,null,"H","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 Caldervale STF that identifies sludge would only  leave the site via un-contained surface drainage during catastrophic tank failure. However, realistically the physical property of sludge is slow flowing suspension and relatively immobile. Notwithstanding  the size of the site and rough ground vegetation plus including the limitations of the PondSim software. \n\nNote this represents an as-is scenario, mitigation measures to protect the environment have been proposed for this site.",null,"As is' model output",null,null,null,"Bunding solution with surface drainage routing"]
[null,"If any of the site inventory has a runoff time of a few days…",null,null,null,null,"N/A  - Run-off time is an estimate of how long it would take to flow to the nearest receptor."]
[null,"If any of the site inventory has a runoff time of a few weeks…"]
[]
[]
[null,"Topography, geology and hydrology"]
[]
[null,"Made ground (artificial ground)",null,null,null,"M","A medium environmental hazard rating has been selected for Made Ground (Artificial Deposit) as it is shown to be present across the majority of the site. This is likely to relate to the historical presence of sludge beds and other assets sewage related assets in this area.\n","BGS geoviewer","Made ground - undivided  (artificial deposit)  shown as per image.","http://mapapps2.bgs.ac.uk/geoindex/home.html",null,"Stantec (2020) Calder Vale Sewage Treatment Works Ground Engineering Desk Study Report [41527092_CALDE STA WWT WWT RP Z 0001]","The available online 1:50,000 scale geological mapping (BGS, 2020) shows BGS Artificial Ground covering the entirety of the site. This ground is described as “Made Ground (undivided) – Artificial Deposit. This artificial ground spans to the River Calder to the south and east, and includes the surrounding railways and embankments, but is not recorded at Calder Vale Industrial Estate to the west. Historical mapping suggests that localised pockets of deeper Made Ground will be encountered across the site, in the location of the development options, associated with the demolition and infilling of former tanks and the presence of historical sludge beds.","Central Alliance GEO (2021) - Ground Investigation Factual Report - Calder Vale STW [2371218-FAC-02]","The site is not indicated to be underlain with deposits of Made Ground, however due to the nature of the site, deposits associated with general construction are anticipated to be present throughout.","Stantec (2021) - Caldervale  STF\nEnvironmental Permit Site Condition Report","Artificial Deposit is mapped as underlying the whole of the installation area.  This ground is described as ‘Made ground (undivided) – Artificial Deposit” This artificial deposit extends laterally to the River Calder to the south and east, and includes the surrounding railways and embankments, but is not recorded at Calder Vale Industrial Estate to the west. \nIt is likely, given the history of the area, that variable and potentially significant thicknesses of Made Ground comprising a mixture of cohesive and non-cohesive materials are present across the much of the installation area, reflecting reworked natural strata, demolition materials derived from sequential site development, and sewage related substrate including the historical presence of sludge beds"]
[null,"Alluvium - Superficial deposits ",null,null,null,"M","A Medium Environmental Hazard Rating has been selected as Alluvium deposits are shown across the site, which may be soft and high compressibility. ","BGS geoviewer"," Alluvium - Clay, Silt, Sand and Gravel  overlay the site as per  image. ","http://mapapps2.bgs.ac.uk/geoindex/home.html",null,"Stantec (2020) Calder Vale Sewage Treatment Works Ground Engineering Desk Study Report [41527092_CALDE STA WWT WWT RP Z 0001]","Superficial deposits of Alluvium are shown at the site, described as clay, silt, sand, and gravel. The deposits may be soft / of high compressibility. These deposits roughly follow the route of the River Calder, as well as surrounding tributaries such as Oakenshaw Beck.\nRiver Terrace Deposits are shown to the north of the site, parallel to the River Calder and underlying the Alluvium. Although not shown on the BGS mapping, the River Terrace Deposits are likely to be encountered underlying the Alluvium. The River Terrace Deposits are described as comprising sand and gravel, locally with lenses of silt, clay or peat.","Central Alliance GEO (2021) - Ground Investigation Factual Report - Calder Vale STW [2371218-FAC-02]","The published geology of the area indicates that the site is underlain by Alluvium, comprising of Clay, Silt, Sand and Gravel deposited 2 million years ago in the Quaternary period.","Stantec (2021) - Caldervale  STF\nEnvironmental Permit Site Condition Report","Superficial deposits of Alluvium are mapped beneath the whole of the installation area.  The Alluvium is described as being comprised of clay, silt sand and gravel. \nIt is noted that River Terrace Deposits are shown to the north east of the installation, parallel to the River Calder and Alluvium.  Although it is not shown on the BGS mapping, the River Terrace Deposits are considered likely to be encountered underlying the Alluvium.  The River Terrace Deposits are described as comprising sand and gravel, locally with lenses or silt, clay or peat. "]
[null,"Pennine Lower Coal Measures - Bedrock ",null,null,null,"M"," A Medium Environmental Hazard Rating has been selected owing to the majority of the installation area is underlain by the Pennine Middle Coal Measures Formation.","BGS geoviewer","Pennine middle coal measures formation - mudstone, siltstone, and sandstone  as per  image. ","https://magic.defra.gov.uk/MagicMap.aspx",null,"Stantec (2020) Calder Vale Sewage Treatment Works Ground Engineering Desk Study Report [41527092_CALDE STA WWT WWT RP Z 0001]","The site is shown to be underlain by Pennine Middle Coal Measures (Coal Measures), which is described by the BGS (BGS, 2020) as interbedded grey mudstone, siltstone, pale grey sandstone and commonly coal seams, with a bed of mudstone containing marine fossils at the base, and several such marine fossil-bearing mudstones in the upper half of the unit. The\npublished BGS 1:50,000 map (BGS, 1998) indicates the general dip direction south of the site to the north. The dip angle is not indicated. The Pennine Middle Coal Measures is not shown to outcrop on the site, however the superficial deposits are shown to be absent immediately to the north of the site suggesting that the thickness of the superficial deposits is likely to increase to the south of the site, towards the River Calder. A northeast to southwest striking fault is shown straddling the northern site boundary. A northwest to southeast striking fault is shown to the south of the site.","Central Alliance GEO (2021) - Ground Investigation Factual Report - Calder Vale STW [2371218-FAC-02]","The solid geology comprises Mudstone, Siltstone and Sandstone of the Pennine Middle Coal Measures Formation deposited during the Carboniferous period.","Stantec (2021) - Caldervale  STF\nEnvironmental Permit Site Condition Report","The installation and surrounding area is underlain by Pennine Middle Coal Measures (Coal Measures), which is described by the BGS (BGS 2022) as interbedded grey mudstone, siltstone, pale grey sandstone and commonly coal seams, with a bed of mudstone containing marine fossils at the base, and several such marine fossil-bearing mudstones in the upper half of the unit."]
[null,"River Calder",null,null,null,"M","The River Calder  running northeast  adjacent to the WwTW, is situated within the 'Calder from River Chald to River Aire waterbody' has an overall WFD classification of 'Moderate', with an ecological status of 'Moderate' and  a chemical status of 'Fail'.  \n\nThe River Calder  will transport any contaminants that enter the river through surface water runoff, groundwater flow and other potential receptors downstream. A high risk has been selected as the 2D modelling for Caldervale STF identifies sludge has the potential to leave the site via un-contained surface drainage.","Catchment Data Explorer (CDE)","BOD, phosphate and biological quality are reasons for the waterbody failing to meet 'Good' ecological status. ","https://environment.data.gov.uk/catchment-planning/WaterBody/GB104027062632",null,"Stantec (2020) Calder Vale Sewage Treatment Works Ground Engineering Desk Study Report [41527092_CALDE STA WWT WWT RP Z 0001]","The site boundary runs roughly parallel to the River Calder, at a minimum distance of approximately 25m in the east of the site and approximately 320m in the west of the site. The River Calder flows northeast, from its source, in Todmorden, approximately 40km west and converges with the River Aire approximately 9.2km northeast of the site.","Central Alliance GEO (2021) - Ground Investigation Factual Report - Calder Vale STW [2371218-FAC-02]","The site is bounded to the north and west by the interchange between the Lancashire and Yorkshire Railway Line and the Hallam Line and to the south and east by the River Calder."]
[null,"Mitigation - do these apply?"]
[null,"Some secondary and tertiary containment system is present (see Likelihood assessment)"]
[null,"Spills will be contained within the hard surfaced and drained areas, and returned to the WwTW for treatment. \n"]
[null,"2D modelling for Caldervale STF identifies  routes to river or watercourse via un-contained surface drainage. \n"]
[]
[null,null,null,null,"Path & Mitigation Overall Rating","H","Justification: \n - There are geo-environmental barriers underlying the site such as made ground and clay but there is a risk of contamination transport to the river should spills occurs outside drained areas\n - There is good secondary containment for chemicals.\n - Modelling identifies a catastrophic spill would leave the site via un-contained drainage routes. However, the majority of the sludge would be contained within hard surfaced and drained areas and returned to the WwTw for treatment. PondSim cannot  model these features and due to its limitations."]
[null,"Climatic conditions"]
[null,"Annual rainfall < 1000 mm",null,"1041 mm",null,"M"," - The annual rainfall is greater than 1,000 mm","Met  Office","UK climate averages","https://www.metoffice.gov.uk/research/climate/maps-and-data/uk-climate-averages/gcw9q2z5u"]
[]
[]
[]
[null,"Fire Fighting Water"]
[null,"Flammable materials normally present on site in large quantities",null,null,null,"L"," - There are limited flammable materials on the STF that would combust over long periods and require significant volumes of fire fighting water. \n - The key flammable material is the biogas, which is contained within the double contained storage gas bag. Use and transfer of biogas is controlled via the site SCADA system, which includes low and high pressure monitoring that would shut off any gas flows in the event of gas release, such as in a fire.\n - If firefighting was needed on the site the site drainage system returns surface water to treatment within the WwTW.\n - Fire water is therefore not  considered to be a pathway risk. "]
[null,"Fire fighting and cooling water contaminated by inventory",null,null,null,"L"]
[null,"Location"]
[null,"Flooding",null,null,null,"H"," - A high environmental hazard rating has been selected as the majority of the site is classed as Flood Zone 3.","EA Flood Map for Planning","The Caldervale site is mostly classified as a Flood Zone 3 (high risk of flooding)","https://flood-map-for-planning.service.gov.uk/summary?easting=434646&northing=420430",null,"Stantec (2020) Calder Vale Sewage Treatment Works Ground Engineering Desk Study Report [41527092_CALDE STA WWT WWT RP Z 0001]","The Environment Agency’s Flood Map for Planning shows that the majority of the site is within a Flood Risk Zone 3, at risk of river flooding (Environment Agency, 2020), with a small stretch of site at the centre-east running to the southeast boundary within a Flood Risk Zone 2. A Flood Risk Zone 3 is land having a 1 in 100 or greater annual probability of river flooding. The River Calder does not appear to benefit from flood defences, with a Flood Risk Zone 2 having between a 1 in 100 and 1 in 1000 probability of river flooding.","Stantec (2021) - Caldervale  STF\nEnvironmental Permit Site Condition Report","The Envirocheck Report (2020) shows that the whole of the installation area is situated within a Flood Zone 3 (land assessed as having a 1 in 100 (>1%) or greater annual probability of flooding from rivers). This area is not shown to be within an area benefiting from flood defences.\nThe EA’s map of surface water flooding indicates that limited areas within the installation are susceptible to surface water flooding, mostly restricted to roads and areas of hardstanding, although the digester compound is mapped as being at the highest risk.\nParts of the installation, in the east, and the wider YW land holding, has been subject to flooding in recent years.   "]
[null,"Site is connected to a Wastewater Treatment Works",null,null,null,"L"," - The WwTW is designed with capacity to treat peaks in flow and loads including from surface water drainage input from the site.  \n - In the event of a catastrophic failure on site the SCADA system would manage the Wastewater treatment process to contain any additional load within the system, where possible, or high level and treatment alarms would alert site operators or the Yorkshire Water central control room, who would start the emergency procedures in line with the site accident procedures in the site EMS and shut down/divert processes that risk the  WwTW discharge consent. \n - The potential risk of releases via the WwTW is considered to be low. \n"]
[null,"Site is connected to a CSO discharge.",null,null,null,"L","The site has a CSO however this is not connected to the site drainage therefore it presents a low environmental hazard rating. A catastrophic spill could also potentially connect with the Final Effluent outfall however this is also deemed to be a low risk due to the surfaced areas and associated drainage.\n"]
[null,"The site is predominantly flat.",null,null,null,"L"]
[null,null,null,null,"Site Considerations  Overall Rating","H"]
[]
[]
[null,null,null,null,"Pathway Overall Hazard Rating","H"]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
["H"]
["M"]
["L"]

{"sheet":"1) c) Receptors","index":5,"n_rows":99,"n_cols":25,"rows_kept":99,"cut":false,"hidden":false,"merged":[]}
[]
[null,null,null,null,null,null,null,null,null,null,null,"Postcode","WF1 5PJ"]
[]
[null,"Receptors","Within","units",null,null,null,null,null,"Environmental hazard rating ","Notes","Source","Description","Link","Image","Source","Link","Description","Image","Source","Description","Link","Image","Source","Description"]
[null,"Watercourses and bodies"]
[null,"River Calder",125,"m",null,null,null,null,null,"H","The River Calder  running south and east of the WwTW, is situated within the 'Calder from River Chald to River Aire waterbody' has an overall WFD classification of 'Moderate', with an ecological status of 'Moderate' and  a chemical status of 'Fail'.  \n\nThe River Calder  will transport any contaminants that enter the river through surface water runoff, groundwater flow and other potential receptors downstream.\n The wider area falls within a nitrate vulnerable zone.\nTherefore a High Environmental Hazard Rating has been selected. ","Drinking Water Safeguard Zones and NVZs","Surface Water S269 - Oakenshaw Beck from Source to River Calder NVZ  0.6 km away from STF.","https://environment.data.gov.uk/farmers/",null,"Catchment Data Explorer (CDE) ",null,"BOD, phosphate and biological quality are reasons for the waterbody failing to meet 'Good' ecological status. ",null,"Soil observatory","Broadleaved woodland, arable,  grassland and urban","http://mapapps2.bgs.ac.uk/ukso/home.html?layer=CEHLCM2015",null,"Stantec (2021) - Caldervale  STF\nEnvironmental Permit Site Condition Report","The River Calder is located approximately 125 m to the east of the installation boundary, at its closest point and is also present to the south, approximately 425 m at its closest point.  The river flows in an easterly and north easterly direction in the vicinity of the installation. There is a small unnamed tributary of the River Calder, approximately 70 m to the north.  The River Calder and its tributary represent a sensitive receptor at potential risk of pollution. The Water Framework Directive assessment for the catchment area indicates an overall Moderate quality for the 2019 assessment (EA, 2022)."]
[null,"Secondary A aquifers and soilscape","Beneath site",null,null,null,null,null,null,"M","Classified as a Secondary A aquifer, therefore medium environmental hazard rating. The Pennine Middle Coal Measures Formation is classified by the EA as a Secondary A Aquifer (Envirocheck, 2021). Secondary A Aquifers are defined as formations with permeable layers capable of supporting water supplies at a local rather than strategic scale and in some cases forming an important source of base flow to rivers.\n\n\n","MAGIC Landscape Geology and Soils Aquifer Designation Map (Superficial drift), groundwater vulnerability, and Soilscape map (England), BGS Geoviewer ","Secondary A Classification Medium\nTypology Secondary A\nAquifer Designation Map (Superficial Drift) (England) Typology Secondary A\nGroundwater Vulnerability Map (England)\nClassification Medium\nSoilscape (England) reference 6, 17, 20\n","https://magic.defra.gov.uk/MagicMap.aspx http://mapapps2.bgs.ac.uk/geoindex/home.html",null,null,null,null,null,"Stantec (2021) - Caldervale  STF\nEnvironmental Permit Site Condition Report","The superficial deposits of Alluvium and bedrock of Pennine Middle Coal Measures Formation are classified by the Environment Agency as Secondary A Aquifers (MAGIC, 2022).  These are defined as formations with permeable layers capable of supporting water supplies at a local rather than strategic scale and in some cases forming an important source of base flow to rivers.  The BGS boreholes have also confirmed the presence of River Terrace Deposits underlying the Alluvium which is also classified as a Secondary A Aquifer."]
[null,"Pennine lower coal measures - Bedrock ","Beneath site",null,null,null,null,null,null,"M","Classified as a medium environmental hazard rating. No nearby Source protection zones. It is assumed that the groundwater in the bedrock will be in hydraulic connection to the made ground, superficial deposits and the surface water features and has an environmental hazard rating as Medium. ","MAGIC Landscape Geology and Soils Aquifer Designation Map (Bedrock) (England), BGS Geoviewer ","Secondary A Classification Medium\nTypology Secondary A\nAquifer Designation Map (Superficial Drift) (England)\nTypology Secondary A\nGroundwater Vulnerability Map (England)\nClassification Medium\nSoilscape (England) reference 6, 17, 20\n","https://magic.defra.gov.uk/MagicMap.aspx http://mapapps2.bgs.ac.uk/geoindex/home.html"]
[null,"Abstraction","N/A","m",null,null,null,null,null,"L","There are no active surface water abstraction licences within 500 m.  ","Magic map Source Protection Zones merged (England)","Magic map: No SPZs",null,null,"Stantec (2020) Calder Vale Sewage Treatment Works Ground Engineering Desk Study Report [41527092_CALDE STA WWT WWT RP Z 0001]",null,"There are no surface water abstractions within 250m of the site."]
[null,"Ashfields and the Half Moon (LWS)",180,null,null,null,null,null,null,"L","Ashfields and the Half Moon LWS 180 m to the east and south east at the closest point. This LWS also includes the Low Wood AW c. 440 m to the east.","Stantec (2021) - Caldervale  STF\nEnvironmental Permit Site Condition Report","Table 14 - ecological receptors"]
[null,"Southern Washlands (LNR)",740,"m",null,null,null,null,null,"L","Southern Washlands Local Nature Reserve (LNR) and Local Wildlife Site (LWS) 740 m to the north east.","MAGIC Land and Marine Based Statutory Designations","The Southern Washlands (LNR) is located 1.2 km west of the site","https://magic.defra.gov.uk/MagicMap.aspx"]
[null,"Walton Nature Park  (LNR)",2145,"m",null,null,null,null,null,"L","Walton Nature Park (LNR) is located 2.145 km southeast of the installation.","MAGIC Land and Marine Based Statutory Designations","Walton Nature Park (LNR) is located 2.145 km south east of the installation.","https://magic.defra.gov.uk/MagicMap.aspx"]
[null,"Pugneys (LNR)",2790,"m",null,null,null,null,null,"L","Pugneys (LNR) is located 2.7 km southwest of the installation.","MAGIC Land and Marine Based Statutory Designations","Pugneys (LNR) is located 2.7 km southwest of the installation.","https://magic.defra.gov.uk/MagicMap.aspx"]
[null,"Alverthorpe and Wrenthorpe Meadows (LNR)",2928,"m",null,null,null,null,null,"L","Alverthorpe and Wrenthorpe Meadows (LNR) is located 2.9 km northwest of the installation.","MAGIC Land and Marine Based Statutory Designations","Alverthorpe and Wrenthorpe Meadows (LNR) is located 2.9 km northwest of the installation.","https://magic.defra.gov.uk/MagicMap.aspx"]
[null,"Denby Grange Colliery Ponds Special Area of Conservation (SAC) ",8800,"m",null,null,null,null,null,"L","Denby Grange Colliery Ponds Special Area of Conservation (SAC) is located c. 8.8 km south west of the installation boundary.","Stantec (2021) - Caldervale  STF\nEnvironmental Permit Site Condition Report","Table 14 - ecological receptors"]
[null,"WwTWs",50,"m",null,null,null,null,null,"L","The WwTWs is a very large operation.  Direct impact on operation is extremely unlikely as sludge would not accumulate to a depth where there was risk of disruption to control cabinets or other assets. "]
[null,null,null,null,null,null,null,null,"Water Overall Rating","H","Justification: One of the above includes a High Environmental Hazard Rating"]
[null,"Habitation"]
[null,"Industry","<200","m",null,null,null,null,null,"L","A commercial/industrial property is located adjacent to the west, beyond which are rail lines and scrub land. Approximately 200 m to the west are further commercial industrial properties forming the Calder Vale Industrial Estate. ","Stantec (2021) - Caldervale  STF\nEnvironmental Permit Site Condition Report"]
[null,"Railway ","<50","m",null,null,null,null,null,"L","Rail lines and scrub land bounds the installation to the north.","Stantec (2021) - Caldervale  STF\nEnvironmental Permit Site Condition Report"]
[null,"Residences","80>110","m",null,null,null,null,null,"L","Residential properties between 80 m and 110 m to the north at the closest points, elevated c. 20 m above the level of the installation. ","Council planning maps","Property map","https://planning.wakefield.gov.uk/online-applications/spatialDisplay.do?action=display&searchType=Application",null,"Stantec (2021) - Caldervale  STF\nEnvironmental Permit Site Condition Report"]
[]
[null,null,null,null,null,null,null,null,"Habitation Overall Rating","L","Justification: All the receptors are Low Environmental Hazard Rating"]
[null,"Other"]
[null,null,null,null,null,null,null,null,null,null,null," "]
[]
[]
[null,null,null,null,null,null,null,null,"Receptors Overall Hazard Rating",{"$f":"IF(OR(J17=\"H\",J23=\"H\",J25=\"H\"),\"H\",IF(OR(J17=\"M\",J23=\"M\",J25=\"M\"),\"M\",\"L\"))","v":"H"},null,"  "," "]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
["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,{"$f":"'1) a) Source'!J36","v":"H"},{"$f":"'1) b) Pathway'!F40","v":"H"},{"$f":"'1) c) Receptors'!J28","v":"H"},{"$f":"IF(E106<6,\"Low\",IF(E106<10,\"Medium\",\"High\"))","v":"High"}]
[]
[]
[]
[]
[]
[]
[null,"Possible Combination",null,null,"Site Hazard Rating"]
[null,"L","L","L","Low"]
[null,"M","M","L","Low"]
[null,"H","L","L","Low"]
[null,"M","M","M","Medium"]
[null,"H","M","L","Medium"]
[null,"H","H","L","Medium"]
[null,"H","M","M","High"]
[null,"H","H","M","High"]
[null,"H","H","H","High"]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[null,"Rating lookup table"]
[null,"L",1]
[null,"M",2]
[null,"H",3]
[]
[null,"This assessment score"]
[null,{"$f":"VLOOKUP(B6,B101:C103,2,FALSE)","v":3},{"$f":"VLOOKUP(C6,B101:C103,2,FALSE)","v":3},{"$f":"VLOOKUP(D6,B101:C103,2,FALSE)","v":3},{"$f":"B106*C106*D106","v":27}]

{"sheet":"3) Likelihood","index":7,"n_rows":295,"n_cols":9,"rows_kept":295,"cut":false,"hidden":false,"merged":[[89,5,102,5],[157,5,169,5],[211,1,222,1],[211,3,222,3],[211,5,222,5],[170,1,183,1],[170,3,183,3],[170,4,183,4],[170,5,183,5],[157,1,169,1],[157,3,169,3],[157,4,169,4],[184,1,196,1],[184,3,196,3],[184,4,196,4],[184,5,196,5],[197,1,210,1],[143,1,156,1],[143,3,156,3],[143,4,156,4],[143,5,156,5],[197,3,210,3],[197,4,210,4],[197,5,210,5],[20,6,20,7],[22,1,34,1],[22,3,34,3],[22,4,34,4],[22,5,34,5],[103,1,115,1],[103,3,115,3],[103,4,115,4],[103,5,115,5],[116,1,129,1],[116,4,129,4],[116,5,129,5],[62,1,75,1],[62,3,75,3],[62,4,75,4],[62,5,75,5],[130,1,142,1],[130,3,142,3],[130,4,142,4],[130,5,142,5],[116,3,129,3],[76,1,88,1],[76,3,88,3],[76,4,88,4],[76,5,88,5],[89,1,102,1],[89,3,102,3],[89,4,102,4],[35,1,48,1],[35,3,48,3],[35,4,48,4],[35,5,48,5],[49,1,61,1],[49,3,61,3],[49,4,61,4],[49,5,61,5],[211,4,222,4],[235,1,247,1],[235,3,247,3],[235,4,247,4],[235,5,247,5],[223,1,234,1],[223,3,234,3],[223,4,234,4],[223,5,234,5]]}
[]
[]
[]
[]
[]
[]
[]
[]
[null,"Rational for the assessment of likelihood "]
[null,"Identification of risks is based on the individual sources of potentially polluting material (sludge tanks, etc.) and on the general site risk identified in the CIRIA guidance"]
[null,"Assessment of the unmitigated risk of emissions from each source is based on the potential for failure of any containment measures provided. "]
[null,"This considers the primary, secondary and tertiary containment associate with each source and the potential breach of these containment measures."]
[null,"The likelihood of failure is quantified, based on the guidelines provided in CIRIA 736 and Yorkshire Waters experience of containment failures on their sites. "]
[null,"Basing the quantification of containment failure on Yorkshire Water experience on their own sites therefore accounts for the Yorkshire Water design specification, making the assessment relevant to the designs. ",null,"The identification of the likelihood of the loss of containment ad subsequent release of contaminants "]
[null,"The mitigation applied to the risks considers the operational and maintenance procedures, including regular inspecting and testing of containment measures.  "]
[null,"Based on the regular inspecting and testing of containment measures it is considered that the potential for catastrophic failures would be identified prior to failure and either decommissioned and replaced (for example tanks) or repairs (e.g. pipelines)"]
[]
[]
[]
[]
[]
[null,"Risk ","Description of Risk","UNMITIGATED LIKELIHOOD \n","Mitigation applied","MITIGATED LIKELIHOOD",null,"Low","Site Overall Likelihood"]
[null,"Primary and imported sludge reception tank\n140 m3 working volume\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 2012 with a 60yr minimum design 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- Imported sludge has audible and visual alarm\n- The sludge screen buffer tank includes a vent to atmosphere to prevent damage to the tank walls and roof during tanker unloading operations. \n- Five levels of discharge for raw sludge, each with visual inspection and sampling\n- Physical property of sludge is slow flowing suspension and relatively immobile. This limits the risk of sludge flowing to off-site receptors and facilitates clean-up if a spill was to happen. \n- Run-off from sludge areas returned to WwTW flow. Clean water discharged to surface water drain or soakaway.\n- The tank is surrounded by impermeable hardstanding which drains to the inlet pumping station which would return spills for treatment. Roads and turnings should also be impermeable concrete.","M"," - Weekly TCM checks, including visual inspection \n - Site is manned typically from 07:00 - 15:00, with standby working from 11:00 - 19:00 with call out for any alarms or issues.\n - Assets are subject to non destructive testing (NDT).  The schedule for this is determined by the age of the asset and the findings of previous asset inspections.  Where problems are identified, they are rectified to ensure that the tank remains safe for continued operation.\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 - All link seals are appropriately treated and grouted.  \n - In the  event of overflow of contaminants it is possible that sludge could flow across paved areas to grassed /stones areas. If this occurs then YW will react with an emergency spill response and clean up the area that has been contaminated. \n\n\n\n\n\n\n\n\n\n\n","L"]
[null,null,"Failure risk:"]
[null,null," - Catastrophic tank failure - The tank is 10 years old and has a minimum 60 year design life.  Tanks are subject to regular inspection. Yorkshire Water have never experienced catastrophic failure of concrete tanks built and maintained to the YWS specifications.  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 feed pumps, the risk of overflow is low. The high-level overflow also drains into the site drainage system and is then returned to the head of the works. "]
[null,null,"- Potential for minor leakage around pipe flanges, particularly at the outlet pipework connection as this is below ground. Emission due to leaks is therefore 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. 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 protected by bollards between the tank and tanker unloading point and 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 SPP security.  Likelihood of emissions due to vandalism is low"]
[null,null,"- Fire, explosion - the tank is open topped so flammable gasses would not build up in the tank.  Likelihood of emissions due to fire or explosion is low"]
[null,null,"- Geological factors - There has  been no evidence of wider geotechnical issues during the time the WwTW has been operational on the site.  the tank was designed with geotechnical design input.  Likelihood of emissions due to geological issues is low"]
[null,null,"- Ageing - Tank constructed in 2012 with a minimum design life of 60 years. Likelihood of emissions due to age is low"]
[null,null,"- Lightning strike - the tank is 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 primary and imported sludge reception tank\n\n - Spillage of non hazardous sludge: catastrophic failure and leaks from pipework.","Containment: \n- All pipelines, valves and screens are made from steel.\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 and onwards to the head of the works\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"," - Above ground pipework visually inspected weekly. \n - TCM checks are conducted regularly\n - Site is manned typically from 07:00 - 15:00, with standby working from 11:00 - 19:00 with call out for any alarms or issues.\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 - In the  event of loss of contaminants it is possible that sludge could flow across paved areas to grassed /stones areas. If this occurs then YW will react with an emergency spill response and clean up the area that has been contaminated.  ","L"]
[null,null,"Failure risk:"]
[null,null," - Catastrophic pipe failure - A schedule of non-destructive testing means the potential for catastrophic failure is considered low."]
[null,null," - Leaks from over ground pipework -   Pipes are pressure tested when installed and regularly checked for leaks once in operation.  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. As there is no pipework below ground,  the risk of emission due to leaks is therefore considered to be low. "]
[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. Possibility of failure of screen housing leading to release of sludge, overfilling of sludge screen housing or Screened Liquid Sludge Pump station and Transfer Tank. Due to the significant flow of sludge through these process items the risk of emission of sludge is considered medium"]
[null,null,"- Abuse - All site staff and tanker operators are trained to operate the import tank. 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 tanker unloading point 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 low"]
[null,null,"- Fire, explosion - Pipe content is not flammable.  The pipework is not routed through areas where an explosive atmosphere is likely to develop. 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 - The pipework was installed in 2012 with a minimum design life of 25 years. They are regularly monitored to check for leakages and material failure. Likelihood of emissions due to age is 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,"Sludge thickening feed tanks\n2x 880 m3 working volume\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 1980 with a 60yr minimum design life. \n- Approx. 90% of the tanks storage capacity is below ground level.  This significantly limits the volume of liquid that could be rapidly released in the unlikely event of tank failure. \n - High level alarms linked to site SCADA control program and interlock to stop pumping into the tanks if high level reached. \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 inlet pumping station which would return spills for treatment","M"," - Weekly TCM checks, including visual inspection \n - Site is manned typically from 07:00 - 15:00, with standby working from 11:00 - 19:00 with call out for any alarms or issues.\n - Assets are subject to non destructive testing (NDT).  The schedule for this is determined by the age of the asset and the findings of previous asset inspections.  Where problems are identified, they are rectified to ensure that the tank remains safe for continued operation.\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 - All link seals are appropriately treated and grouted.  \n - In the  event of overflow of contaminants it is possible that sludge could flow across paved areas to grassed /stones areas. If this occurs then YW will react with an emergency spill response and clean up the area that has been contaminated. \n\n\n\n\n\n\n\n\n\n\n","L"]
[null,null,"Failure risk:"]
[null,null," - Catastrophic tank failure - Tanks are subject to regular inspection. Yorkshire Water have never experienced catastrophic failure of concrete tanks built and maintained to the YWS specifications.  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 feed pumps, the risk of overflow is low. The high-level overflow also drains into the site drainage system and is then returned to the head of the works. "]
[null,null,"- Potential for minor leakage around pipe flanges, where they enter and exit the tank, however these would be contained by the impermeable surfacing and drainage. Emission due to overflow or leaks is therefore considered low."]
[null,null,"-Shortcomings or failure in operational control system: the site is maintained inline with a proactive maintenance schedule and the EMS to ensure ongoing operation of all plant items. Operators are trained in the running of plant items. Likelihood of emissions due to operational failure is low"]
[null,null,"- Abuse -all site staff and tanker Operators are trained to operate the 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 tank is protected by high walling, including kerbs between the tank and site access roads.  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 tank is vented so flammable gasses would not build up in the tank.  Likelihood of emissions due to fire or explosion is low"]
[null,null,"- Geological factors - There has  been no evidence of wider geotechnical issues during the time the WwTW has been operational on the site.  the tank was designed with geotechnical design input.  Likelihood of emissions due to geological issues is low"]
[null,null,"- Ageing - Tanks constructed in 1980 with a minimum design life of 60 years. Likelihood of emissions due to age is low"]
[null,null,"- Lightning strike - the tanks 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 sludge thickening feed tanks\n\n - Spillage of non hazardous sludge: catastrophic failure and leaks from pipework.","Containment: \n- All pipelines, valves and screens are made from steel\n-Thickener feed pipe and thickened sludge pipe are over impermeable surfacing that falls to the site drainage\n-Sludge thickeners are contained within a water-tight trough situated 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"," - Above ground pipework visually inspected weekly. \n  - TCM checks are conducted regularly \n - Site is manned typically from 07:00 - 15:00, with standby working from 11:00 - 19:00 with call out for any alarms or issues.\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 - In the  event of loss of contaminants it is possible that sludge could flow across paved areas to grassed /stones areas. If this occurs then YW will react with an emergency spill response and clean up the area that has been contaminated.  ","L"]
[null,null,"Failure risk:"]
[null,null," - Catastrophic pipe failure -  A schedule of non-destructive testing means the potential for catastrophic failure is considered low."]
[null,null," - Leaks from over ground pipework -   Pipes are pressure tested when installed and regularly checked for leaks once in operation.  Any leaks would be contained by the site drainage. the potential for emission is therefore considered low."]
[null,null," - Leaks from underground pipework would be emitted to ground. Underground pipes are designed and maintained to Yorkshire Water specifications. The risk of emission due to leaks is therefore considered to be low. "]
[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. 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 or kerbs 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 low"]
[null,null,"- Fire, explosion - Pipe content is not flammable.  The pipework is not routed through areas where an explosive atmosphere is likely to develop. 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 - The pipework was installed in 1980 with a minimum design life of 25 years. They are regularly monitored to check for leakages and material failure. Likelihood of emissions due to age is 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,"SAS storage tank\n2,150 m3 working volume\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 2002 with a 60yr minimum design life. \n- Approx. 30% of the tank's storage capacity is below ground level.  This limits the volume of liquid that could be rapidly released in the unlikely event of tank failure. \n - High level alarms linked to site SCADA control program and interlock to stop pumping into the tanks if high level reached. \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 inlet pumping station which would return spills for treatment","M"," - Weekly TCM checks, including visual inspection \n - Site is manned typically from 07:00 - 15:00, with standby working from 11:00 - 19:00 with call out for any alarms or issues.\n - Assets are subject to non destructive testing (NDT).  The schedule for this is determined by the age of the asset and the findings of previous asset inspections.  Where problems are identified, they are rectified to ensure that the tank remains safe for continued operation. \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 - All link seals are appropriately treated and grouted.  \n - In the  event of overflow of contaminants it is possible that sludge could flow across paved areas to grassed /stones areas. If this occurs then YW will react with an emergency spill response and clean up the area that has been contaminated. \n\n\n\n\n\n\n\n\n\n\n","L"]
[null,null,"Failure risk:"]
[null,null," - Catastrophic tank failure - The tank is 20 years old and has a minimum 60 year design life. Tanks are subject to regular inspection. Yorkshire Water have never experienced catastrophic failure of concrete tanks built and maintained to the YWS specifications.  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 feed pumps, the risk of overflow is low. The high-level overflow also drains into the site drainage system and is then returned to the head of the works. "]
[null,null,"- Potential for minor leakage around pipe flanges, where they enter and exit the tank, however these would be contained by the impermeable surfacing and drainage. Emission due to overflow or leaks is therefore considered low."]
[null,null,"-Shortcomings or failure in operational control system: the site is maintained inline with a proactive maintenance schedule and the EMS to ensure ongoing operation of all plant items. Operators are trained in the running of plant items. Likelihood of emissions due to operational failure is low"]
[null,null,"- Abuse -all site staff and tanker Operators are trained to operate the 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 tank is protected by high walling, including kerbs between the tank and site access roads.  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 tank is vented so flammable gasses would not build up in the tank.  Likelihood of emissions due to fire or explosion is low"]
[null,null,"- Geological factors - There has  been no evidence of wider geotechnical issues during the time the WwTW has been operational on the site.  the tank was designed with geotechnical design input.  Likelihood of emissions due to geological issues is low"]
[null,null,"- Ageing - Tanks constructed in 2002 with a minimum design life of 60 years. Likelihood of emissions due to age is low"]
[null,null,"- Lightning strike - the tanks 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 SAS storage tank\n\n - Spillage of non hazardous sludge: catastrophic failure and leaks from pipework.","Containment: \n- All pipelines, valves and screens are made from steel\n- Most pipework is above ground and over impermeable surfacing that falls to the site drainage. \n- Frost and accidental protection where practical (all pipes 150 mm and below should have lagging and trace heating)\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- Straight runs and sweeping bends rather than curves","M"," - Above ground pipework visually inspected weekly. \n  - TCM checks are conducted regularly \n - Site is manned typically from 07:00 - 15:00, with standby working from 11:00 - 19:00 with call out for any alarms or issues.\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 - In the  event of loss of contaminants it is possible that sludge could flow across paved areas to grassed /stones areas. If this occurs then YW will react with an emergency spill response and clean up the area that has been contaminated.  ","L"]
[null,null,"Failure risk:"]
[null,null," - Catastrophic pipe failure -  A schedule of non-destructive testing means the potential for catastrophic failure is considered low."]
[null,null," - Leaks from over ground pipework -   Pipes are pressure tested when installed and regularly checked for leaks once in operation.  Any leaks would be contained by the site drainage. the potential for emission is therefore considered low."]
[null,null," - Leaks from underground pipework would be emitted to ground. Underground pipes are designed and maintained to Yorkshire Water specifications. The risk of emission due to leaks is therefore considered to be low. "]
[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. 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 or kerbs 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 low"]
[null,null,"- Fire, explosion - Pipe content is not flammable.  The pipework is not routed through areas where an explosive atmosphere is likely to develop. 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 - The pipework was installed in 2002 with a minimum design life of 25 years. They are regularly monitored to check for leakages and material failure. Likelihood of emissions due to age is 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 tanks\n1 x 880 m3\n1 x 450 m3\nworking volumes\n\nSpillage of non hazardous sludge: \n - catastrophic failure of tank\n - tank overflow or\n - tank leaks.","Containment:\n- Constructed in 1980 (concrete) and 2004 (steel) with a 60 and 20 year minimum design life respectively.\n- Approx. 90% of the digester feed tank no.1 storage capacity is below ground level.  This significantly limits the volume of liquid that could be rapidly released in the unlikely event of tank failure. \n- High level alarms linked to site SCADA control program and interlock to stop pumping into the tanks if high level reached. \n- Physical property of sludge is slow flowing suspension and relatively immobile. This limits the risk of sludge flowing to off-site receptors and facilitates clean-up if a spill was to happen. \n- The site is designed to drain towards the site centre, away from identified Receptors. \n- The tank is surrounded by impermeable hardstanding which drainages to the inlet pumping station which would return spills for treatment","M"," - Weekly TCM checks, including visual inspection \n - Site is manned typically from 07:00 - 15:00, with standby working from 11:00 - 19:00 with call out for any alarms or issues.\n - Assets are subject to non destructive testing (NDT).  The schedule for this is determined by the age of the asset and the findings of previous asset inspections.  Where problems are identified, they are rectified to ensure that the tank remains safe for continued operation.\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 - All link seals are appropriately treated and grouted.  \n - In the  event of overflow of contaminants it is possible that sludge could flow across paved areas to grassed /stones areas. If this occurs then YW will react with an emergency spill response and clean up the area that has been contaminated. \n\n\n\n\n\n\n\n\n\n\n","L"]
[null,null,"Failure risk:"]
[null,null," - Catastrophic tank failure - The tanks are 42 and 18 years old with a design life of 60 and 20 years respectively. Tanks are subject to regular inspection.  Based on the CIRIA risk criteria for concrete and steel tanks, the potential is therefore considered medium."]
[null,null," - Tank overflow or leaks - Due to level monitors and the interlock on feed pumps, the risk of overflow is low. The high-level overflow also drains into the site drainage system and is then returned to the head of the works. "]
[null,null,"- Potential for minor leakage around pipe flanges, where they enter and exit the tank, however these would be contained by the impermeable surfacing and drainage. Emission due to overflow or leaks is therefore considered low."]
[null,null,"-Shortcomings or failure in operational control system: the site is maintained inline with a proactive maintenance schedule and the EMS to ensure ongoing operation of all plant items. Operators are trained in the running of plant items. Likelihood of emissions due to operational failure is low"]
[null,null,"- Abuse -all site staff and tanker operators are trained to practice standard operating practices for sludge importing. 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 protected roadside kerb and the tank itself is situated approximately 10 meters away from an access 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 low"]
[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 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 1980 and 2004 with a minimum design life of 60 and 20 years respectively. Likelihood of emissions due to age is low"]
[null,null,"- Lightning strike - Lightning risk assessment has been carried out on site. Likelihood of emissions due to lightning is low"]
[null,"Pipework associated with the digester feed tank\n\n - Spillage of non hazardous sludge: catastrophic failure and leaks from pipework.","Containment: \n- All pipelines, valves and screens are made from steel\n- Most pipework is above ground and over impermeable surfacing that falls to the site drainage. \n- Frost and accidental protection where practical (all pipes 150 mm and below should have lagging and trace heating)\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- Straight runs and sweeping bends rather than curves","M"," - Above ground pipework visually inspected weekly. \n  - TCM checks are conducted regularly\n - Site is manned typically from 07:00 - 15:00, with standby working from 11:00 - 19:00 with call out for any alarms or issues.\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 - In the  event of loss of contaminants it is possible that sludge could flow across paved areas to grassed /stones areas. If this occurs then YW will react with an emergency spill response and clean up the area that has been contaminated.  ","L"]
[null,null,"Failure risk:"]
[null,null," - Catastrophic pipe failure -  A schedule of non-destructive testing means the potential for catastrophic failure is considered low."]
[null,null," - Leaks from over ground pipework -   Pipes are pressure tested when installed and regularly checked for leaks once in operation.  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. The pipes are built with secondary containment with the pipework set in the concrete base of the tanks.  This is designed and maintained to the Yorkshire Water specifications. The risk of emission due to leaks is therefore considered to be low. "]
[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 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. The risk of emission of sludge is considered low"]
[null,null,"- Abuse - All site staff and tanker operators are trained to operate the plant items. HAZOP studies have been undertaken as part of the design process. No risk of overflow, due to level monitors and the interlock on feed pumps. Likelihood of emissions due to abuse is low "]
[null,null,"- Impact -  The pipework located safely 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 low"]
[null,null,"- Fire, explosion - Pipe content is not flammable.  The pipework is not routed through areas where an explosive atmosphere is likely to develop. 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 1980 with a minimum design life of 25 years. They are regularly monitored to check for leakages and material failure. Likelihood of emissions due to age is 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\n2x 1,755 m3 \n\n\nSpillage of non hazardous sludge: \n - catastrophic failure of tank\n - tank overflow or\n - tank leaks.","Containment:\n - Concrete tank construction. Installed in 1980 with a 60yr minimum design life.   \n - Approx. 20% of the tanks storage capacity is below ground level.  This limits the volume of liquid that could be rapidly released in the unlikely event of tank failure.\n - High level alarms linked to site SCADA control program and interlock to stop pumping into the tanks if high level reached. Foam radar present\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 inlet pumping station which would return spills for treatment.","M"," - Weekly TCM checks, including visual inspection \n - Site is manned typically from 07:00 - 15:00, with standby working from 11:00 - 19:00 with call out for any alarms or issues.\n - Assets are subject to non destructive testing (NDT).  The schedule for this is determined by the age of the asset and the findings of previous asset inspections.  Where problems are identified, they are rectified to ensure that the tank remains safe for continued operation.\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 - All link seals are appropriately treated and grouted.  \n - In the  event of overflow of contaminants it is possible that sludge could flow across paved areas to grassed /stones areas. If this occurs then YW will react with an emergency spill response and clean up the area that has been contaminated. \n\n\n\n\n\n\n\n\n\n\n","L"]
[null,null,"Failure risk:"]
[null,null," - Catastrophic tank failure - The tanks are within their minimum design life and contain significant volume of sludge. Tanks are subject to regular inspection. 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 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 low"]
[null,null,"- Abuse -all site staff and tanker Operators are trained to operate the digesters. 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 protected by fencing between the tank and low-speed site road. (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 low"]
[null,null,"- Fire, explosion - The tanks are designed to generate biogas, a mix of methane and carbon dioxide.  Under normal operating conditions, this mix is not flammable.  A DSEAR assessment has been completed and compliant equipment installed in areas where abnormal conditions have potential to create a 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 tank was designed with geotechnical design input.  Likelihood of emissions due to geological issues is low"]
[null,null,"- Ageing - Tank constructed in 1980 with a minimum design life of 60 years. Likelihood of emissions due to age in medium."]
[null,null,"- Lightning strike - Lightning protection risk assessment has been completed.  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- Where external and less than 150 NB, pipework is trace-heated and lagged.\n- Digester inlet and outlet pipework, recirculation pipework are all above ground and over impermeable surfacing that falls to the site drainage\n- Tank drain pipework exits below the tank and runs partially below ground. This pipework is only used during drain down operations.\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 - Weekly TCM checks, including visual inspection \n - Site is manned typically from 07:00 - 15:00, with standby working from 11:00 - 19:00 with call out for any alarms or issues.\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   ","L"]
[null,null,"Failure risk:"]
[null,null," - Catastrophic pipe failure -  A schedule of non-destructive testing means the potential for catastrophic failure is considered low."]
[null,null," - Leaks from over ground pipework -   Pipes are pressure tested when installed and regularly checked for leaks once in operation.  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. The pipes are built with secondary containment with the pipework set in the concrete base of the tanks. Only drain pipework is routed below ground and will only be used for maintenance purposes. The risk of emission due to leaks is therefore considered to be low. "]
[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 low. "]
[null,null,"-Shortcomings or failure in operational control system: the site is maintained inline with a proactive maintenance schedule and the EMS to ensure ongoing operation of all plant items. Operators are trained in the running of plant items. Likelihood of emissions due to operational failure is low"]
[null,null,"- Abuse -all site staff and tanker Operators are trained to operate the digesters. 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 low"]
[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,"- Ageing - Pipework constructed in 1980 with a minimum design life of 50 years. Likelihood of emissions due to age is medium. \n- Pipework is subject to regular NDT to confirm that it remains suitable for use"]
[null,null,"- Lightning strike - Lightning protection risk assessment carried out protection installed if required. Likelihood of emissions due to lightning is low."]
[null,"Digested sludge holding tanks\n\n2 x 314 m3 working volumes\n\nSpillage of non hazardous sludge: \n - catastrophic failure of tank\n - tank overflow or\n - tank leaks.","Containment:\n- Steel construction, constructed in 2002 with a 20 yr minimum design 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 open-topped and not susceptible to over-pressure. \n- The site is designed to drain towards the site centre, away from identified Receptors. \n- The tank is surrounded by impermeable hardstanding (reinforced concrete not rolled-compacted) which drains to the inlet pumping station which would return spills for treatment.","M"," - Weekly TCM checks, including visual inspection  \n - Site is manned typically from 07:00 - 15:00, with standby working from 11:00 - 19:00 with call out for any alarms or issues.\n - Assets are subject to non destructive testing (NDT).  The schedule for this is determined by the age of the asset and the findings of previous asset inspections.  Where problems are identified, they are rectified to ensure that the tank remains safe for continued operation.\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 - All link seals are appropriately treated and grouted.  \n - In the  event of overflow of contaminants it is possible that sludge could flow across paved areas to grassed /stones areas. If this occurs then YW will react with an emergency spill response and clean up the area that has been contaminated. \n\n\n\n\n\n\n\n\n\n\n","L"]
[null,null,"Failure risk:"]
[null,null," - Catastrophic tank failure - Tanks are within minimum design life and of relatively low volume. 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 feed pumps, the risk of overflow is low. The high-level overflow also drains into the site drainage system and is then returned to the head of the works. "]
[null,null,"- Potential for minor leakage around pipe flanges, where they enter and exit the tank, however these would be contained by the impermeable surfacing and drainage. Emission due to overflow or leaks is therefore considered low."]
[null,null,"-Shortcomings or failure in operational control system: the site is maintained inline with a proactive maintenance schedule and the EMS to ensure ongoing operation of all plant items. Operators are trained in the running of plant items. Likelihood of emissions due to operational failure is low"]
[null,null,"- Abuse -all site staff and tanker Operators are trained to operate the 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 - Tanks are away from access roads and is protected by kerbs. 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 tank is open topped so flammable gasses would not build up in the tank.  Likelihood of emissions due to fire or explosion is low"]
[null,null,"- Geological factors - There has  been no evidence of wider geotechnical issues during the time the WwTW has been operational on the site.  the tank was designed with geotechnical design input.  Likelihood of emissions due to geological issues is low"]
[null,null,"- Ageing - Tanks constructed in 2002 with a minimum design life of 20 years. Likelihood of emissions due to age is low"]
[null,null,"- Lightning strike - Lightning risk assessment has been carried out on site.  Likelihood of emissions due to lightning is low"]
[null,"Pipework associated with the digested sludge storage 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- Dewatering feed tank inlet pipework are 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 - Weekly TCM checks, including visual inspection \n - Site is manned typically from 07:00 - 15:00, with standby working from 11:00 - 19:00 with call out for any alarms or issues.\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   ","L"]
[null,null,"Failure risk:"]
[null,null," - Catastrophic pipe failure -  A schedule of non-destructive testing means the potential for catastrophic failure is considered low."]
[null,null," - Leaks from over ground pipework -   Pipes are pressure tested when installed and regularly checked for leaks once in operation.  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. The outlet from the tank runs a short distance below ground and is not secondary contained.  This is designed and maintained to the Yorkshire Water specifications. 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. Possibility of failure of screen housing leading to release of sludge, overfilling of sludge screen housing or Screened Liquid Sludge Pump station and Transfer Tank. Due to the significant flow of sludge through these process items the risk of emission of sludge is considered medium"]
[null,null,"- Abuse - All site staff and tanker operators are trained to operate the import tank. 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 tanker unloading point 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 low"]
[null,null,"- Fire, explosion - Pipe content is not flammable.  The pipework is not routed through areas where an explosive atmosphere is likely to develop. 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 - The pipework was installed in 2019 with a minimum design life of 25 years. They are regularly monitored to check for leakages and material failure. Likelihood of emissions due to age is 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,"Return liquor balance tank\n\n462 m3 working volumes\n\nSpillage of non hazardous sludge: \n - catastrophic failure of tank\n - tank overflow or\n - tank leaks.","Containment:\n- Steel construction, constructed in 2000 with a 20 yr minimum design 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 open-topped and not susceptible to over-pressure. \n- The site is designed to drain towards the site centre, away from identified Receptors. \n- The tank is surrounded by impermeable hardstanding (reinforced concrete not rolled-compacted) which drains to the inlet pumping station which would return spills for treatment.","M"," - Weekly TCM checks, including visual inspection \n - Site is manned typically from 07:00 - 15:00, with standby working from 11:00 - 19:00 with call out for any alarms or issues.\n - Assets are subject to non destructive testing (NDT).  The schedule for this is determined by the age of the asset and the findings of previous asset inspections.  Where problems are identified, they are rectified to ensure that the tank remains safe for continued operation.\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 - All link seals are appropriately treated and grouted.  \n - In the  event of overflow of contaminants it is possible that sludge could flow across paved areas to grassed /stones areas. If this occurs then YW will react with an emergency spill response and clean up the area that has been contaminated. \n\n\n\n\n\n\n\n\n\n\n","L"]
[null,null,"Failure risk:"]
[null,null," - Catastrophic tank failure - Tanks are subject to regular inspection. Yorkshire Water have never experienced catastrophic failure of steel tanks built 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 feed pumps, the risk of overflow is low. The high-level overflow also drains into the site drainage system and is then returned to the head of the works. "]
[null,null,"- Potential for minor leakage around pipe flanges, where they enter and exit the tank, however these would be contained by the impermeable surfacing and drainage. Emission due to overflow or leaks is therefore considered low."]
[null,null,"-Shortcomings or failure in operational control system: the site is maintained inline with a proactive maintenance schedule and the EMS to ensure ongoing operation of all plant items. Operators are trained in the running of plant items. Likelihood of emissions due to operational failure is low"]
[null,null,"- Abuse -all site staff and tanker Operators are trained to operate the 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 - Tanks are away from access roads and is protected by kerbs. 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 tank is open topped so flammable gasses would not build up in the tank.  Likelihood of emissions due to fire or explosion is low"]
[null,null,"- Geological factors - There has  been no evidence of wider geotechnical issues during the time the WwTW has been operational on the site.  the tank was designed with geotechnical design input.  Likelihood of emissions due to geological issues is low"]
[null,null,"- Ageing - Tanks constructed in 2000 with a minimum design life of 20 years. Likelihood of emissions due to age is low"]
[null,null,"- Lightning strike - Lightning risk assessment has been carried out on site.  Likelihood of emissions due to lightning is low"]
[null,"Pipework associated with the liquor return balancing 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- Dewatering feed tank inlet pipework are 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 - Weekly TCM checks, including visual inspection \n - Site is manned typically from 07:00 - 15:00, with standby working from 11:00 - 19:00 with call out for any alarms or issues.\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   ","L"]
[null,null,"Failure risk:"]
[null,null," - Catastrophic pipe failure -  A schedule of non-destructive testing means the potential for catastrophic failure is considered low."]
[null,null," - Leaks from over ground pipework -   Pipes are pressure tested when installed and regularly checked for leaks once in operation.  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. The outlet from the tank runs a short distance below ground and is not secondary contained.  This is designed and maintained to the Yorkshire Water specifications. 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. Due to the significant flow of sludge through these process items the risk of emission of sludge is considered medium"]
[null,null,"- Abuse - All site staff and tanker operators are trained to operate the import tank. 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 tanker unloading point 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 low"]
[null,null,"- Fire, explosion - Pipe content is not flammable.  The pipework is not routed through areas where an explosive atmosphere is likely to develop. 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 - The pipework was installed in 2019 with a minimum design life of 30 years. They are regularly monitored to check for leakages and material failure. Likelihood of emissions due to age is low"]
[null,null,"- Lightning strike - the pipework is low relative to other structures within the area therefore unlikely to be struck by lightning.  Likelihood of emissions due to lightning is low"]
[null,"Digested Cake Pad\n4,000 m3 \n\nEmission of sludge solids from the conditioning pads\nLeaching of liquors to groundwater","Containment:\n- Dewatered digested sludge cake is stored in windrows, on impermeable concrete surface but without roof to protect from rainfall.\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 cake pads are separated by a narrow strip of grassed area (permeable surfaces)\n- Surface water drains to the inlet pumping station .","L","N/A","L"]
[null,null,"Failure risk:"]
[null,null,"Catastrophic containment failure - The sludge cake is dewatered but susceptible to rewetting from rainfall. The risk of emission to ground is therefore considered to be low. It must be noted that the digested sludge cake is mostly free from pathogen and commonly used as soil conditioner (safe to environment). Surface run-off from the conditioning slab is directed to a wet well which transfers any leached liquors to the return liquors pumping station."]
[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 is regularly inspected as part of TCM checks on the site.  The nature of its construction means that catastrophic failure is very unlikely, and that any significant flaws can be identified through visual checks"]
[null,null,"Lightning strike - Sludge cake is a generally immobile substance. Any impact from a lightning strike, which is not considered likely to occur in this area, will not result in loss of containment. Likelihood of emissions due to lightning is low"]
[null,"Polyelectrolyte Storage\n\nPowder: 750 kg bags into feed tank (5.5m3), ageing tank (2 m3) and stock tank (2 m3)\n\nLiquid: IBC 1m3 into bulk storage tank (5 m3) and holding tank (3 m3)\n\n(Powder + liquid poly for thickening and dewatering)\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 thickening and dewatering.  \n - Polyelectrolyte stored in steel silos and bunded as per YW asset standards.  \n - Spillage of polymer liquid will be contained within the polymer handling area (bunded area within the building) and it will not spread further.   ","L","N/A","L"]
[null,null,"Failure risk:"]
[null,null,"- Catastrophic containment failure - Powder polymer is stored in 750kg bags and emptied into the make-up system, which is within its minimum design life, where it is diluted. The make-up tank is relatively low volume. Liquid polymer is stored in IBCs prior to transfer to holding tanks. 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,"- Potential for minor leakage around pipe flanges, where they enter and exit the tank, however these would be contained by the impermeable surfacing and drainage. Emission due to overflow or leaks is therefore considered low."]
[null,null,"- Shortcomings or failure in operational control system: the site is maintained inline with a proactive maintenance schedule and the EMS to ensure ongoing operation of all plant items. Operators are trained in the running of plant items. Likelihood of emissions due to operational failure is low"]
[null,null,"- Abuse - All site staff 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 low"]
[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,"- Lightning strike - Lightning risk assessment has been carried out on site.  Likelihood of emissions due to lightning is low"]
[null,"Lubricating Oil Storage\n\nStored in small containers i.e. <50 litre drums \n\nEmission of hazardous substance\nLeaching to groundwater","Containment:\n- Very small amounts of oil stored onsite and compliance against Control of Pollution (Oil Storage) (England) Regulations 2001.","L","N/A","L"]
[null,null,"Failure risk:"]
[null,null,"- Catastrophic tank failure - N/A"]
[null,null," - Tank overflow or leaks -  N/A"]
[null,null,"- Potential for minor leakage around pipe flanges, N/A"]
[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 - N/A"]
[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 low"]
[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 - N/A"]
[null,null,"- Ageing – N/A"]
[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,"Risk","Examples of mitigation options","Reduction in likelihood","Detail of measures"]
[null,1,"Operational Failures"]
[null,null,"The team will carry out periodic design reviews and a comprehensive HAZOP involving all the designers (process, civil, drainage, electrical) to ensure primary containment failure risk is very low. In addition operator training will be strengthened with detailed standard operating procedures.",-2,"(Taken from consultant's HAZOP report, for example)"]
[null,null,"Maintenance programme in place",-1]
[null,null,"Audit process in place",-1]
[]
[null,2,"Shortfalls in design"]
[null,null,"Plant control will be assessed at the HAZOP stage",-2]
[null,null,"No outlets below normal liquid level",-1]
[]
[null,3,"Structural failure – materials, components, detailing, corrosion or when exposed to heat and flame"]
[null,null,"Pre-cast concrete tank",-2]
[null,null,"Tank design has no history of failure",-1]
[null,null,"Tank failure risk assessment completed?",-1]
[null,null,"Steel valves",-1]
[null,null,"Structures will be built to British Standards with contractors that work under ISO9000",-1]
[]
[null,4,"Abuse – inappropriate change of use or other misuse"]
[null,null,"Change control procedure in place with sign off from competent personnel in applicable disciplines",-2]
[]
[null,5,"Vehicle impact"]
[null,null,"Armco crash barriers around tank",-2]
[null,null,"Tanks in bund not accessible by vehicles",-2]
[null,null,"Restricted vehicular access to site",-1]
[]
[null,6,"Vandalism, terrorism, force majeure etc"]
[null,null,"lockable valves on outlets (that are locked when not in use by procedure)",-1]
[null,null,"automatic and manual shut off valves",-1]
[null,null,"The site will include fencing where access is open to public",-1]
[null,null,"Passive CCTV system",-1]
[null,null,"Monitored CCTV with motion detection and warning signs",-2]
[]
[null,7,"Fire or explosion"]
[null,null,"DSEAR assessment completed",-2]
[null,null,"Control of ignition sources on site",-1]
[]
[null,8,"Geological factors -subsidence etc"]
[null,null,"Site investigations will be provided to the civil contractor for the design of the foundations",-1]
[]
[null,9,"Ageing or deteriorating assets/sub-components."]
[null,null,"Ageing/deterioration factored into plant design",-1]
[]
[null,10,"Lightning strike"]
[null,null,"Catenary or multiple lightning conductors supplied by specialists",-1]

{"sheet":"4) Site Risk and Classification","index":8,"n_rows":96,"n_cols":11,"rows_kept":96,"cut":false,"hidden":false,"merged":[]}
[]
[]
[]
[]
["Activity","Site Hazard Rating","Likelihood","Overall Site Risk Rating","Indicated Class of Secondary Containment Required"]
["Site - overall summary score",{"$f":"'2) Site Hazard Rating'!E6","v":"High"},"Low",{"$f":"IF(D96<3,\"Low\",IF(D96<5,\"Medium\",\"High\"))","v":"Medium"},{"$f":"IF(D6=\"Low\",\"Class 1\",IF(D6=\"Medium\", \"Class 2\",\"Class 3\"))","v":"Class 2"}]
["Primary and imported sludge reception tank","High","Low","Medium",{"$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"]
["Sludge thickening feed tanks","High","Low","Medium","Class 2"]
["Pipework associated with sludge thickening feed tanks","High","Low","Medium","Class 2",null,null,null,null,null," "]
["SAS storage tank","High","Low","Medium",{"$f":"IF(D11=\"Low\",\"Class 1\",IF(D11=\"Medium\", \"Class 2\",\"Class 3\"))","v":"Class 2"}]
["Pipework associated with the SAS storage tank","High","Low","Medium","Class 2"]
["Digester feed tanks","High","Low","Medium","Class 2"]
["Pipework associated with the digester feed tanks","High","Low","Medium","Class 2"]
["Digesters","High","Low","Medium","Class 2"]
["Pipework associated with the digesters","High","Low","Medium","Class 2"]
["Digested sludge holding tanks","High","Low","Medium","Class 2"]
["Pipework associated with the digested sludge holding tanks","High","Low","Medium","Class 2"]
["Return liqour balance tank","High","Low","Medium","Class 2"]
["Pipework associated with the return liqour balance tank","High","Low","Medium","Class 2"]
["Digested Cake Pad","High","Low","Medium","Class 2"]
["Polyelectrolyte storage ","High","Low","Medium","Class 2"]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
["Rating lookup table"]
["Low",1]
["Medium",2]
["High",3]
[]
[{"$f":"VLOOKUP(B6,A92:B94,2,FALSE)","v":3},{"$f":"VLOOKUP(C6,A92:B94,2,FALSE)","v":1},null,{"$f":"A96*B96","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$2","v":8},{"$f":"N6*$P$2","v":12},{"$f":"O6*$P$2","v":16},4,"H","Consequence",null,"High"]
[null,"Very low",null,1,"up to 10%",null,1,"Category 4",null,null,null,{"$f":"L6*$P$3","v":3},{"$f":"M6*$P$3","v":6},{"$f":"N6*$P$3","v":9},{"$f":"O6*$P$3","v":12},3,"M",null,null,"Medium High"]
[null,"Low",null,2,"up to 20%",null,2,"Category 3",null,null,null,{"$f":"L6*$P$4","v":2},{"$f":"M6*$P$4","v":4},{"$f":"N6*$P$4","v":6},{"$f":"O6*$P$4","v":8},2,"L",null,null,"Medium Low"]
[null,"Medium",null,3,"up to 50%",null,3,"Category 2",null,null,null,{"$f":"L6*$P$5","v":1},{"$f":"M6*$P$5","v":2},{"$f":"N6*$P$5","v":3},{"$f":"O6*$P$5","v":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."]