{"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":27,"macros":1,"external_links":1,"defined_names":57,"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":58,"n_cols":6,"rows_kept":58,"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 Sandall 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":"https://defra.sharepoint.com/sites/EADMSProd8/LIB5/EPR-DP3492ZX/Application ＆ Associated Docs/[Application Variation Sandall ADBA V003 - 040124.xlsm]"}]
[]
[]
[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 Sandall STF is provided in the worksheet 1a) Source "]
[null,"1 b) Pathway",null,"The Pathway information for Sandall STF is provided in the worksheet 1) b) Pathway "]
[null,"1 c) Receptors",null,"The Receptor information for Sandall  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","2022-03-10","KP","SW","First draft check"]
[null,"V2","2022-03-16","KP","JP","Second draft check"]
[null,"V3","27.11.2023","KP",null,"Removal of dewatering tank "]

{"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 Sandall STF based on the using the Anaerobic Digestion and Biogas Association (ADBA) secondary containment risk assessment tool and associated guidance. The ADBA risk assessment is based on CIRIA 736  Containment systems for the prevention of pollution: Secondary, tertiary and other measures for industrial and commercial premises. "]
[]
[]
[null,"(2) Key Assumptions"]
[null,"Any assumptions are outlined in the spreadsheet."]
[]
[]
[]
[]
[]
[]
[]
[null,"(3) Basis of calculations"]
[]
[null,"ADBA Risk Assessment tool."]
[]
[null,"(4) References"]
[null,"All references are outlined in the spreadsheet."]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[null,"(5) Special features"]
[]
[null,null,"Input Cell"]
[null,null,"Key Outputs"]
[]
[]
[]
[null,"(6) Holds or items that require Clarification"]
[]
[]
[]
[]
[]
[null,"(7) Summary"]
[]
[]
[]
[]
[]
[]
[]
[]
[null,"Best Practice Guide"]

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

{"sheet":"1) a) Source","index":3,"n_rows":42,"n_cols":15,"rows_kept":42,"cut":false,"hidden":false,"merged":[[28,1,28,3],[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",213,"m3","Imported sludge buffer tank  (1 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,"Indigenous secondary sludge liquid","Liquid",35,"m3","SAS chamber  (88 yrs old) and associated pipework","Not flammable","No","Low","L","Permitted waste types are non-hazardous however the volume is below 100m3.",null,null,"1000+","High"]
[null,"Screened indigenous primary and imported sludge liquid","Liquid",784,"m3","Two imported sludge holding tanks  (13 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,"Feedstock Overall Rating","M","Any material with a \"High\" rating means the overall rating is High"]
[null,"Process"]
[null,"Thickened sludge","Liquid",350,"m3","Sludge blending tank (13 yrs old) and associated pipework","Not flammable","No","Low","M","Permitted waste types are non-hazardous however the volume is below 1,000m3."]
[null,"Digesting sludge","Liquid",3456,"m3","Two digesters (9 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",320,"m3","Dewatering feed tank (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 sludge (emergency storage)","Liquid",1600,"m3","Two sludge storage [console tank 3 and 4] \n(32 yrs old) and associated pipework","Not flammable","No","Low","H","Permitted waste types are non-hazardous however the volume is significant."]
[null,"Digested cake","Solid",8000,"m3"," Cake pad ","Not flammable","No","Low","M","Largely immobile therefore presents only a medium risk."]
[null,null,null,null,null,null,null,null,"Process Overall Rating","H","Any material with a \"High\" rating means the overall rating is High"]
[null,"Additives and site chemicals"]
[null,"Powder polyelectrolyte – thickening and 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 – thickening plant (drum thickeners)","Liquid",6,"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, however can be potentially impacted by moving machinery."]
[null,"Made up polyelectrolyte – thickening plant (GBT)","Liquid",10,"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, however can be potentially impacted by moving machinery."]
[null,"Made up polyelectrolyte – dewatering plant","Solid",6,"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",1.3,"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,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. 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\",J34=\"H\"),\"H\",IF(OR(,J28=\"M\"=\"M\"),\"M\",\"L\"))","v":"H"}]
[]
[]
["H"]
["M"]
["L"]

{"sheet":"1) b) Pathway","index":4,"n_rows":104,"n_cols":14,"rows_kept":104,"cut":false,"hidden":false,"merged":[[5,9,5,10],[5,7,5,8]]}
[]
[null,null,null,null,null,null,null,"Postcode","DN2 4NF"]
[]
[null,"Pathway - the route from primary containment to receptor",null,null,null,"Environmental hazard rating ","Notes","Source","Description","Link","Image","Source","Description","Source"]
[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.","Unmitigated spill model"]
[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 hours due to the form of sludge and the distance and pathway identified to the receptors.  2D modelling has been completed for Sandall STF that identifies sludge would  leave the site (subject to via Pathway 1  (overground to oxbow lake) and 2 (uncontained surface drainage to outlet). 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,"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,"Artificial ground",null,null,null,"M","A medium environmental hazard rating has been selected for geology due to made ground exhibiting variable thickness.\nThis is likely to relate to the historical presence of sludge beds and other sewage related assets in this area.\n\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 whole of the installation area, reflecting reworked natural strata, demolition materials derived from sequential site development, and sewage related substrate. ","BGS geoviewer","No record of made ground  (artificial deposit)  shown as per image.","http://mapapps2.bgs.ac.uk/geoindex/home.html",null,"Stantec (2021) WINEP EBPR Programme - Sandall Sewage Treatment Works Ground Engineering Desk Study Report [RT-NN-2828-01]","The geological maps do not record the presence of artificial ground at the site.\nGiven that the historical mapping shows various phases of development to have occurred it is expected that variable and potentially significant thicknesses of Made Ground will be encountered across the site.","Stantec (2021) - Sandall STF\nEnvironmental Permit Site Condition Report"]
[null," Superficial deposits",null,null,null,"M","The superficial deposits to the east  of the installation area are classified as a secondary A aquifer therefore a Medium Environmental Hazard Rating has been selected. \n\nSuperficial deposits are not mapped beneath the west of the installation area. \n\nThe north eastern area of the installation and the eastern extremities of the digester compound are shown to be underlain be superficial deposits of Till, which is described as “clay and silty clay, commonly pebbly and sandy, stiff, possibly interbedded with sand and gravel-rich lenses and rare peat”.  \nDeposits of Alluvium are shown in the north west of the installation, associated with the River Don, and described as typically comprising clay, silt, sand and gravel. ","BGS geoviewer","Orange: RIVER TERRACE DEPOSITS (UNDIFFERENTIATED) - SAND AND GRAVEL\n\nBlue: TILL, MID PLEISTOCENE - DIAMICTON","http://mapapps2.bgs.ac.uk/geoindex/home.html",null,"Stantec (2021) WINEP EBPR Programme - Sandall Sewage Treatment Works Ground Engineering Desk Study Report [RT-NN-2828-01]","The western half of the site shows Superficial Deposits to be absent. The eastern half of the site is shown to be underlain by superficial deposits of Glacial Till. The BGS Lexicon (BGS, 2021) describes Diamicton as “Clay and silty clay, commonly pebbly and sandy, stiff, possibly interbedded with sand and gravel-rich lenses and rare peat”.\nA limited area in the east of the site is also shown to be underlain by River Terrace Deposits, described by the BGS (BGS, 2021) as “Sand and gravel, locally with lenses of silt, clay or peat”.\n\nThe bedrock of the Chester Formation is classified by the Environment Agency (EA) as a Principal Aquifer (MAGIC, 2021). Principal Aquifers are defined by the EA as “layers of rock or drift deposits that have high intergranular and/or fracture permeability - meaning they usually provide a high level of water storage. They may support water supply and/or river base flow on a strategic scale”.\nThe superficial deposits of the River Terrace Deposits recorded on the BGS mapping in the east of the site (but that the GI suggests are absent) is classified by the EA as a Secondary A Aquifer (MAGIC, 2021). Secondary A Aquifers are defined by the EA 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”.\nThe superficial deposits of Diamicton are classified by the EA as a Secondary Undifferentiated Aquifer (MAGIC, 2021). Secondary Undifferentiated Aquifers are designated by the EA where it has not been possible to attribute either category Secondary A or Secondary B to a stratum. In most cases, this means that the stratum in question has previously been designated as both a secondary aquifer and a non-aquifer in different locations due to the variable characteristics of the stratum.","Stantec (2021) - Sandall STF\nEnvironmental Permit Site Condition Report"]
[null," Geology ",null,null,null,"M","The installation is underlain by the Chester Formation.   A Medium Environmental Hazard Rating has been selected.","BGS geoviewer","CHESTER FORMATION - SANDSTONE, PEBBLY (GRAVELLY)","https://magic.defra.gov.uk/MagicMap.aspx",null,"Stantec (2021) WINEP EBPR Programme - Sandall Sewage Treatment Works Ground Engineering Desk Study Report [RT-NN-2828-01]","The site and surrounding area are shown to be underlain by the Chester Formation, described by the BGS (BGS, 2021) as “red-brown, yellow, or yellow-mottled, very fine to coarse-grained sandstones that are commonly cross-bedded, locally micaceous, silty or argillaceous, pebbly or conglomeratic, and generally friable”.","Stantec (2021) - Sandall STF\nEnvironmental Permit Site Condition Report"]
[null,"River Don",null,null,null,"M","The River Don  running north west  of the WwTW, is situated within the 'Don from Mill Dyke to River Ouse' waterbody. This waterbody has an overall ecological status of 'Moderate' and  a chemical status of 'Fail'.  \n\nThe River Don  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 Sandall STF identifies sludge has the potential to leave the site.","Catchment Data Explorer (CDE)","Invertebrates, fish, ammonia and phosphate are reasons for the waterbody failing to meet 'Good' ecological status. ","Don from Mill Dyke to River Ouse | Catchment Data Explorer | Catchment Data Explorer",null,"Stantec (2021) WINEP EBPR Programme - Sandall Sewage Treatment Works Ground Engineering Desk Study Report [RT-NN-2828-01]","The historical course of the River Don is located approximately 60m north-west of the site. Whilst this section of the river has been impounded as a result of alterations to the course of the river, aerial imagery indicates that the former channel still holds water (being assumedly in hydraulic continuity with the surrounding groundwater table, as would have been the case historically).\nThe course of the River Don is understood to have been altered in the early 19th Century (through being straightened to remove meanders) to aid navigation. The Wheatley Cut, a section of the River Don located approximately 250m to the north-west of the site, is such an alteration.\nA further channel of the River Don, “The Flood Drain” is present immediately north of the Wheatley Cut.\nThe various channelised sections of the River Don flow towards the north-east, entering the River Ouse at Goole approximately 22km to the north-east, and the Aire and Calder Navigation (a canalised section of the Rivers Aire and Calder) approximately 10.5km to the north."]
[null,"River Don Navigation / Wheatley Cut",null,null,null,"M","The River Don Navigation  running north west  of the WwTW, is situated within the 'Don from Mill Dyke to River Ouse' waterbody. This waterbody has an overall ecological status of 'Moderate' and  a chemical status of 'Fail'.  \n\nThe River Don Navigation  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 Sandall STF identifies sludge has the potential to leave the site.","Catchment Data Explorer (CDE)","Invertebrates, fish, ammonia and phosphate are reasons for the waterbody failing to meet 'Good' ecological status. ","Don from Mill Dyke to River Ouse | Catchment Data Explorer | Catchment Data Explorer",null,"Stantec (2021) WINEP EBPR Programme - Sandall Sewage Treatment Works Ground Engineering Desk Study Report [RT-NN-2828-01]","The historical course of the River Don is located approximately 60m north-west of the site. Whilst this section of the river has been impounded as a result of alterations to the course of the river, aerial imagery indicates that the former channel still holds water (being assumedly in hydraulic continuity with the surrounding groundwater table, as would have been the case historically).\nThe course of the River Don is understood to have been altered in the early 19th Century (through being straightened to remove meanders) to aid navigation. The Wheatley Cut, a section of the River Don located approximately 250m to the north-west of the site, is such an alteration.\nA further channel of the River Don, “The Flood Drain” is present immediately north of the Wheatley Cut.\nThe various channelised sections of the River Don flow towards the north-east, entering the River Ouse at Goole approximately 22km to the north-east, and the Aire and Calder Navigation (a canalised section of the Rivers Aire and Calder) approximately 10.5km to the north."]
[null,"oxbow lake",null,null,null,"M","The River Don / oxbow lake  running north west  of the WwTW, is situated within the 'Don from Mill Dyke to River Ouse' waterbody. This waterbody has an overall ecological status of 'Moderate' and  a chemical status of 'Fail'.  \n\nThe River Don/ oxbow lake  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 Sandall STF identifies sludge has the potential to leave the site.","Catchment Data Explorer (CDE)","Invertebrates, fish, ammonia and phosphate are reasons for the waterbody failing to meet 'Good' ecological status. ","Don from Mill Dyke to River Ouse | Catchment Data Explorer | Catchment Data Explorer",null,"Stantec (2021) WINEP EBPR Programme - Sandall Sewage Treatment Works Ground Engineering Desk Study Report [RT-NN-2828-01]","The historical course of the River Don is located approximately 60m north-west of the site. Whilst this section of the river has been impounded as a result of alterations to the course of the river, aerial imagery indicates that the former channel still holds water (being assumedly in hydraulic continuity with the surrounding groundwater table, as would have been the case historically).\nThe course of the River Don is understood to have been altered in the early 19th Century (through being straightened to remove meanders) to aid navigation. The Wheatley Cut, a section of the River Don located approximately 250m to the north-west of the site, is such an alteration.\nA further channel of the River Don, “The Flood Drain” is present immediately north of the Wheatley Cut.\nThe various channelised sections of the River Don flow towards the north-east, entering the River Ouse at Goole approximately 22km to the north-east, and the Aire and Calder Navigation (a canalised section of the Rivers Aire and Calder) approximately 10.5km to the north."]
[null,"Pond / former lagoon / drainage ditch",null,null,null,"M","A pond / former lagoon associated with the wider WwTW is located adjacent to the north west of the installation.  Also to the north west is a drainage ditch, approximately 50 m from the installation boundary. ","Catchment Data Explorer (CDE)","Invertebrates, fish, ammonia and phosphate are reasons for the waterbody failing to meet 'Good' ecological status. ","Don from Mill Dyke to River Ouse | Catchment Data Explorer | Catchment Data Explorer",null,"Stantec (2021) - Sandall STF\nEnvironmental Permit Site Condition Report","The course of the River Don is understood to have been altered in the early 19th Century (through being straightened to remove meanders) to aid navigation.  The historical course of the River Don is located immediately adjacent to the northern boundary of the installation.  Whilst this section of the river has been impounded as a result of alterations to the course of the river it still holds water forming an oxbow lake feature. Anecdotal information suggests that this feature may be linked to the northern most channel of the River Don via a siphon under the canalised navigation. It is also likely to be in hydraulic continuity with the surrounding groundwater.\nThe Wheatley Cut, a canalised section of the River Don, is located approximately 200m to the north is such an alteration.  A further channel of the River Don is present immediately north of the Wheatley Cut. A short drain connect the two, located approximately 180 m to the north.  \nA pond / former lagoon associated with the wider WwTW is located adjacent to the north west of the installation.  Also to the north west is a drainage ditch, approximately 50 m from the installation boundary. "]
[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 Sandall STF identifies  routes to river or watercourse."]
[]
[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. 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,"582 mm",null,"L"," - The annual rainfall is less than 1,000 mm","Met  Office","UK climate averages","https://www.metoffice.gov.uk/research/climate/maps-and-data/uk-climate-averages/gcx21p9fr"]
[]
[]
[]
[null,"Fire Fighting Water"]
[null,"Flammable materials normally present on site in large quantities",null,null,null,"L"," - There is 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 included low and high pressure monitoring that would shut off any gas flows in the event of gas release, such as a fire.\n - If firefighting was needed on 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,"M"," - A medium environmental hazard rating has been selected as the  of the site is classed as both Flood Zone 1 and 3.","EA Flood Map for Planning","The Sandall site is mostly classified as a Flood Zone 1 (low risk of flooding) but also fringed with Flood Zone 3 that benefits from flood defences.","https://flood-map-for-planning.service.gov.uk/summary?easting=460304&northing=406092",null,"Stantec (2021) WINEP EBPR Programme - Sandall Sewage Treatment Works Ground Engineering Desk Study Report [RT-NN-2828-01]","The EA’s Flood Map for Planning shows that the western half of the site and the site’s northern fringes are located within a Flood Zone 3 that benefits from flood defences. The EA state that “land and property in this flood zone would have a high probability of flooding without the local flood defences. These protect the area against a river flood with a 1% chance of happening each year, or a flood from the sea with a 0.5% chance of happening each year”.\nThe remainder of the site is indicated to be located within a Flood Zone 1, indicating a less than 1 in 1,000 (<0.1%) annual probability of flooding from rivers and the sea.\nThe EA’s map of surface water flood risk indicates that limited areas (typically roads/hard-surfaced areas) across the site are located in areas of low (between a 1 in 100 [0.1%] and 1 in 1000 [0.1%] annual probability) risk of surface water flooding. A small area between the two banks of oxidation ditches is shown to be in an area of medium (between 1 in 100 [0.1%] and 1 in 30 [3.3%] annual probability) risk of surface water flooding. A further small area on the access road along the site’s northern boundary is shown to be in an area of high (greater than 1 in 30 [3.3%] annual probability) risk of surface water flooding."]
[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","M"]
[]
[]
[null,null,null,null,"Pathway Overall Hazard Rating",{"$f":"IF(OR(F26=\"H\",F40=\"H\"),\"H\",IF(OR(F26=\"M\",F40=\"M\"),\"M\",\"L\"))","v":"H"}]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
["H"]
["M"]
["L"]

{"sheet":"1) c) Receptors","index":5,"n_rows":103,"n_cols":22,"rows_kept":103,"cut":false,"hidden":false,"merged":[[6,16,8,16],[6,15,8,15]]}
[]
[null,null,null,null,null,null,null,null,null,null,null,"Postcode","DN2 4NF"]
[]
[null,"Receptors","Within","units",null,null,null,null,null,"Environmental hazard rating ","Notes","Source","Description","Link","Image","Source","Description","Source",null,null,"Image","Source"]
[null,"Watercourses and bodies"]
[null,"River Don",200,"m",null,null,null,null,null,"H","The River Don  running north west  of the WwTW, is situated within the 'Don from Mill Dyke to River Ouse' waterbody. This waterbody has an overall ecological status of 'Moderate' and  a chemical status of 'Fail'.  \n\nThe River Don  will transport any contaminants that enter the river through surface water runoff, groundwater flow and other potential receptors downstream.\nThe 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 S298 - LOWER DON NVZ","https://environment.data.gov.uk/farmers/",null,"Catchment Data Explorer (CDE) ","Invertebrates, fish, ammonia and phosphate are reasons for the waterbody failing to meet 'Good' ecological status. ","Soil observatory","Suburban, urban, grassland and broadleaved woodland","http://mapapps2.bgs.ac.uk/ukso/home.html?layer=CEHLCM2015",null,"Stantec (2021) - Sandall STF\nEnvironmental Permit Site Condition Report"]
[null,"River Don Navigation / Wheatley Cut",180,"m",null,null,null,null,null,"H","The course of the River Don is understood to have been altered in the early 19th Century (through being straightened to remove meanders) to aid navigation. The Wheatley Cut, a section of the River Don located approximately 250m to the north-west of the site, is such an alteration. \n\nA short drain connect Wheatley Cut and the River Don, located approximately 180 m to the north.  ","Stantec (2021) WINEP EBPR Programme - Sandall Sewage Treatment Works Ground Engineering Desk Study Report [RT-NN-2828-01]",null,null,null,"Stantec (2021) - Sandall STF\nEnvironmental Permit Site Condition Report","The course of the River Don is understood to have been altered in the early 19th Century (through being straightened to remove meanders) to aid navigation.  The historical course of the River Don is located immediately adjacent to the northern boundary of the installation.  Whilst this section of the river has been impounded as a result of alterations to the course of the river it still holds water forming an oxbow lake feature. Anecdotal information suggests that this feature may be linked to the northern most channel of the River Don via a siphon under the canalised navigation. It is also likely to be in hydraulic continuity with the surrounding groundwater.\nThe Wheatley Cut, a canalised section of the River Don, is located approximately 200m to the north is such an alteration.  A further channel of the River Don is present immediately north of the Wheatley Cut. A short drain connect the two, located approximately 180 m to the north.  \nA pond / former lagoon associated with the wider WwTW is located adjacent to the north west of the installation.  Also to the north west is a drainage ditch, approximately 50 m from the installation boundary. "]
[null,"oxbow lake",10,"m",null,null,null,null,null,"H","The historic course of the River Don is located adjacent to the north-west of the site. Whilst this section of the river has been impounded as a result of alterations to the course of the river, aerial imagery indicates that the former channel still holds water (being assumedly in hydraulic continuity with the surrounding groundwater table, as would have been the case historically).","Stantec (2021) WINEP EBPR Programme - Sandall Sewage Treatment Works Ground Engineering Desk Study Report [RT-NN-2828-01]"]
[null,"Pond / former lagoon / drainage ditch",50,"m",null,null,null,null,null,"M","A pond / former lagoon associated with the wider WwTW is located adjacent to the north west of the installation.  Also to the north west is a drainage ditch, approximately 50 m from the installation boundary. "]
[null,"Aquifers and soilscape","Beneath site",null,null,null,null,null,null,"H","Medium hazard rating assigned. The superficial deposits of Till in the north east of the installation are classified by the EA as a Secondary Undifferentiated Aquifer (MAGIC, 2022).  Secondary Undifferentiated Aquifers are designated by the EA where it has not been possible to attribute either category Secondary A or Secondary B to a stratum due to the variable characteristics of the stratum.\nThe superficial deposits of Alluvium recorded in the north west of the installation are classified by the EA as Secondary A Aquifer (MAGIC, 2022). 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","MAGIC Landscape Geology and Soils Aquifer Designation Map (Superficial drift), groundwater vulnerability, and Soilscape map (England), BGS Geoviewer ","Secondary A Classification Medium\nTypology\nSecondary A\nAquifer Designation Map (Superficial Drift) (England)\nTypology Secondary A\nGroundwater Vulnerability Map (England)\nClassification Medium\nSoilscape (England) reference 10\n","https://magic.defra.gov.uk/MagicMap.aspx http://mapapps2.bgs.ac.uk/geoindex/home.html",null,null,null,null,null,null,null,"Stantec (2021) - Sandall STF\nEnvironmental Permit Site Condition Report"]
[null,"Bedrock / Geology","Beneath site",null,null,null,null,null,null,"M","Classified as a medium environmental hazard rating. The Chester Formation is classified by the EA as a Principal Aquifer (MAGIC, 2022).  Principal Aquifers are defined by the EA as layers of rock or drift deposits that have high intergranular and/or fracture permeability – meaning they usually provide a high level of water storage. They may support water supply and/or river base flow on a strategic scale.No nearby Source protection zones. ","MAGIC Landscape Geology and Soils Aquifer Designation Map (Bedrock) (England), BGS Geoviewer ","Aquifer Designation Map (Bedrock) - Principal","https://magic.defra.gov.uk/MagicMap.aspx http://mapapps2.bgs.ac.uk/geoindex/home.html",null,null,null,null,null,null,null,"Stantec (2021) - Sandall STF\nEnvironmental Permit Site Condition Report"]
[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: SPZ located further than 2km",null,null,"Stantec (2021) WINEP EBPR Programme - Sandall Sewage Treatment Works Ground Engineering Desk Study Report [RT-NN-2828-01]","The Envirocheck Report indicates that there are no recorded active abstractions from groundwater located within 500 m of the site.",null,null,null,null,"Stantec (2021) - Sandall STF\nEnvironmental Permit Site Condition Report"]
[null,"Sandall  (LNR) [statutory designation]",1900,"m",null,null,null,null,null,"L","Sandall (LNR) is located 1.9 km south east of the installation.","MAGIC Land and Marine Based Statutory Designations","Sandall (LNR) is located 2.03 km south east of the installation.","https://magic.defra.gov.uk/MagicMap.aspx",null,null,null,null,null,null,null,"Stantec (2021) - Sandall STF\nEnvironmental Permit Site Condition Report"]
[null,"Quarry Park (LNR) [statutory designation]",4700,"m",null,null,null,null,null,"L","Quarry Park (LNR) is located 4.7 km north east of the installation","MAGIC Land and Marine Based Statutory Designations","Quarry Park (LNR) is located 4.7 km north east of the installation","https://magic.defra.gov.uk/MagicMap.aspx",null,null,null,null,null,null,null,"Stantec (2021) - Sandall STF\nEnvironmental Permit Site Condition Report"]
[null,"Sandall Beat (SSSI) [statutory designation]",1900,"m",null,null,null,null,null,"L","Sandall Beat (SSSI) is located 1.9 km south east of the installation.","MAGIC Land and Marine Based Statutory Designations","Sandall Beat (SSSI) is located 2 km south east of the installation.","https://magic.defra.gov.uk/MagicMap.aspx",null,null,null,null,null,null,null,"Stantec (2021) - Sandall STF\nEnvironmental Permit Site Condition Report"]
[null,"Hatfield Moor SAC [statutory designation]",8300,"m",null,null,null,null,null,"L","Hatfield Moor SAC is located approximately 8.3 km east ","Stantec (2021) - Sandall STF\nEnvironmental Permit Site Condition Report","5.9     Sensitive Land Use\n\nWithin 10 km (statutory designations) of the installation"]
[null,"Thorne and Hatfield moors SPA  [statutory designation]",8400,"m",null,null,null,null,null,"L","Thorne and Hatfield moors SPA is located approximately 8.4 km east   ","Stantec (2021) - Sandall STF\nEnvironmental Permit Site Condition Report","5.9     Sensitive Land Use\n\nWithin 10 km (statutory designations) of the installation."]
[null,"Non statutory designations","<10","m",null,null,null,null,null,"H","•\tWheatley Park and Old Don Oxbows Local Wildlife Site (LWS) directly adjoins to the north. \n•\tBentley Ings LWS 295m to the north.\n•\tArksey Ings LWS 310 m to the north.\n•\tShaw Lane Hedgerows LWS 690 m to the south east.\n•\tBentley Bank LWS 700 m to the north east.\n•\tBentley Common LWS 760 m to the north west\n•\tWheatley Golf Course LWS 840 m - 1 km to the south east.\n•\tPilkington’s Burgy Banks LWS 850m to the north east.\n•\tShaw Lane Pond LWS 910m to the south east.\n•\tLong Sandall Ings LWS 1 km to the north east. \n•\tHagg Wood LWS and AW 1.2 km to the south east.\n•\tDodge Dike Pond LWS 1.3 km to the south east.\n•\tHeather Wood LWS 1.4 km to the south\n•\tShaw Wood LWS and ancient woodland (AW) 1.4 km to the south east. \n•\tPot Hill LWS 1.7 km to the south east.","Stantec (2021) - Sandall STF\nEnvironmental Permit Site Condition Report","5.9     Sensitive Land Use\n\nWithin 2 km (non statutory designations) of the installation:"]
[null,"WwTWs",50,"m",null,null,null,null,null,"L","The WwTW 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,null,null,"Stantec (2021) - Sandall STF\nEnvironmental Permit Site Condition Report"]
[null,null,null,null,null,null,null,null,"Water Overall Rating","H","Justification: The above includes High Environmental Hazard Rating"]
[null,"Habitation"]
[null,"Industry / Commercial",100,"m",null,null,null,null,null,"L","Commercial property , c. 100 m west; ","Stantec (2021) - Sandall STF\nEnvironmental Permit Site Condition Report","Table 1 - surrounding land uses",null,null,null,null,null,null,null,null,"Stantec (2021) - Sandall STF\nEnvironmental Permit Site Condition Report"]
[null,"Railway ",310,"m",null,null,null,null,null,"L","A railway line is located c.310 m to the north, beyond The Flood Drain.","Stantec (2021) - Sandall STF\nEnvironmental Permit Site Condition Report","Table 1 - surrounding land uses",null,null,null,null,null,null,null,null,"Stantec (2021) - Sandall STF\nEnvironmental Permit Site Condition Report"]
[null,"Allotments",20,"m",null,null,null,null,null,"L","Allotment gardens are located adjacent to the west and north west","Stantec (2021) - Sandall STF\nEnvironmental Permit Site Condition Report","Table 1 - surrounding land uses"]
[null,"Residences",100,"m",null,null,null,null,null,"L","Residential properties c. 100 m north east, and c. 200 m south east.\n\n","Doncaster council planning map","Property map","https://planning.doncaster.gov.uk/online-applications/spatialDisplay.do?action=display&searchType=Application",null,"Stantec (2021) - Sandall STF\nEnvironmental Permit Site Condition Report","Table 1 - surrounding land uses",null,null,null,null,"Stantec (2021) - Sandall STF\nEnvironmental Permit Site Condition Report"]
[]
[null,null,null,null,null,null,null,null,"Habitation Overall Rating","L","Justification:  A Low Environmental Hazard Rating is given due to modelled sludge spill not reaching above ground habitation as listed above. "]
[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(J20=\"H\",J27=\"H\",J29=\"H\"),\"H\",IF(OR(J20=\"M\",J27=\"M\",J29=\"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,{"$f":"'1) a) Source'!J37","v":"H"},{"$f":"'1) b) Pathway'!F43","v":"H"},{"$f":"'1) c) Receptors'!J32","v":"H"},{"$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":296,"n_cols":9,"rows_kept":296,"cut":false,"hidden":false,"merged":[[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],[143,5,156,5],[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],[76,5,88,5],[89,5,102,5],[76,3,88,3],[76,4,88,4],[89,3,102,3],[89,4,102,4],[76,1,88,1],[89,1,102,1],[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],[197,5,210,5],[236,1,248,1],[236,3,248,3],[236,4,248,4],[236,5,248,5],[223,1,235,1],[223,3,235,3],[223,4,235,4],[223,5,235,5],[211,4,222,4],[143,1,156,1],[143,3,156,3],[143,4,156,4],[197,3,210,3],[197,4,210,4]]}
[]
[]
[]
[]
[]
[]
[]
[]
[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,"Imported sludge buffer tank\n213 m3 working volume\n\nSpillage of non hazardous sludge: \n - catastrophic failure of tank\n - tank overflow or\n - tank leaks.","Containment:\n - Steel tank construction. Constructed in 2020 with a 20yr 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 have an impermeable surface.","M"," - Tanks visually inspected weekly. \n - TCM checks are conducted regularly. \n- Site is manned 8 - 4 Monday to Friday, including 2hr cover during weekends, with standby cover for the rest of the time for any alarms and 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 1 years old and has a minimum 20 year design life. 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, 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 2020 with an minimum design life of 20 years. Likelihood of emissions due to age is low"]
[null,null,"- Lightning strike - the tank is low relative to other nearby structures and is therefore unlikely to be struck by lightning.  Likelihood of emissions due to Lightning is low"]
[null,"Pipework associated with the Imported sludge buffer 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 8 - 4 Monday to Friday, including 2hr cover during weekends, with standby cover for the rest of the time for any alarms and 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 -   A schedule of non-destructive testing and regular checks for leaks mean it is  considered that there is a low likelihood of significant leakage. Any leaks would be contained by the site drainage. The potential for emission is therefore considered low.  "]
[null,null," - Leaks from underground pipework would be emitted to ground. 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 - the pipework is not routed along areas of potential flammable atmosphere. Likelihood of emissions due to fire or explosion is low"]
[null,null,"- Geological factors - There has been no evidence of wider geotechnical issues during the time the WwTW has been operational on the site.  The tank was designed with geotechnical design input.  Likelihood of emissions due to Geological issues is low"]
[null,null,"- Ageing - The pipework was installed in 2020 with an 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,"Imported sludge holding tanks\n2 x 390 m3 working volume\n\nSpillage of non hazardous sludge: \n - catastrophic failure of tank\n - tank overflow or\n - tank leaks.","\nContainment:\n - Steel tank construction. Constructed in 2008 with a 20yr 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 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"," - Tanks visually inspected weekly. \n - TCM checks are conducted regularly\n- Site is manned 8 - 4 Monday to Friday, including 2hr cover during weekends, with standby cover for the rest of the time for any alarms and 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 13 years old with a 20 year design life. 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 - 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 2008 with an minimum design life of 20 years. Likelihood of emissions due to age is low"]
[null,null,"- Lightning strike - the tanks are low relative to other nearby structures and is therefore unlikely to be struck by lightning.  Likelihood of emissions due to Lightning is low"]
[null,"Pipework associated with Imported sludge holding 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 8 - 4 Monday to Friday, including 2hr cover during weekends, with standby cover for the rest of the time for any alarms and 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 -   A schedule of non-destructive testing and regular checks for leaks mean it is  considered that there is a low likelihood of significant leakage. Any leaks would be contained by the site drainage. The potential for emission is therefore considered low.  "]
[null,null," - Leaks from underground pipework would be emitted to ground. Underground 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 - the pipework is not routed along areas of potential flammable atmosphere. Likelihood of emissions due to fire or explosion is low"]
[null,null,"- Geological factors - There has been no evidence of wider geotechnical issues during the time the WwTW has been operational on the site.  The tank was designed with geotechnical design input.  Likelihood of emissions due to Geological issues is low"]
[null,null,"- Ageing - The pipework was installed in 2008 with an 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 chamber\n100 m3 working volume\n\nSpillage of non hazardous sludge: \n - catastrophic failure of tank\n - tank overflow or\n - tank leaks.","\nContainment:\n - Concrete tank construction. Constructed in 1934 with a 60yr minimum design life.\n- This tank is built into the ground mitigating potential spills.\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"," - Tanks visually inspected weekly. \n - TCM checks are conducted regularly\n- Site is manned 8 - 4 Monday to Friday, including 2hr cover during weekends, with standby cover for the rest of the time for any alarms and 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. The tank is 88 years old with a 60 year design life.  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 - Tank constructed in 1934 with an 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 nearby structures and is therefore unlikely to be struck by lightning.  Likelihood of emissions due to Lightning is low"]
[null,"Pipework associated with SAS chamber\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 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 8 - 4 Monday to Friday, including 2hr cover during weekends, with standby cover for the rest of the time for any alarms and 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 -   A schedule of non-destructive testing and regular checks for leaks mean it is  considered that there is a low likelihood of significant leakage. Any leaks would be contained by the site drainage. The potential for emission is therefore considered low.  "]
[null,null," - Leaks from underground pipework would be emitted to ground. Underground 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 - the pipework is not routed along areas of potential flammable atmosphere. Likelihood of emissions due to fire or explosion is low"]
[null,null,"- Geological factors - There has been no evidence of wider geotechnical issues during the time the WwTW has been operational on the site.  The tank was designed with geotechnical design input.  Likelihood of emissions due to Geological issues is low"]
[null,null,"- Ageing - The pipework was installed in 1934 with an 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 blending tank\n412 m3 working volume\n\nSpillage of non hazardous sludge: \n - catastrophic failure of tank\n - tank overflow or\n - tank leaks.","Containment:\n- Steel tank construction. Constructed in 2008 with a 20 year 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- 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"," - Tanks visually inspected weekly. \n - TCM checks are conducted regularly\n- Site is manned 8 - 4 Monday to Friday, including 2hr cover during weekends, with standby cover for the rest of the time for any alarms and 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 - This tanks is 13 years old with a design life of 20 years. Yorkshire Water have never experienced catastrophic failure of concrete 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 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 2008 with an 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 Sludge blending 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 \n - TCM checks are conducted regularly\n- Site is manned 8 - 4 Monday to Friday, including 2hr cover during weekends, with standby cover for the rest of the time for any alarms and 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 -   A schedule of non-destructive testing and regular checks for leaks mean it is  considered that there is a low likelihood of significant leakage. Any leaks would be contained by the site drainage. The potential for emission is therefore considered low.  "]
[null,null," - Leaks from underground pipework would be emitted to ground. 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 - the pipework is not routed along areas of potential flammable atmosphere. Likelihood of emissions due to fire or explosion is low"]
[null,null,"- Geological factors - There has been no evidence of wider geotechnical issues during the time the WwTW has been operational on the site. The pipework was designed with geotechnical design input.  Likelihood of emissions due to Geological issues is low"]
[null,null,"- Ageing - The pipework was installed in 2008 with an 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 1,728 m3 \n\n\nSpillage of non hazardous sludge: \n - catastrophic failure of tank\n - tank overflow or\n - tank leaks.","Containment:\n - Steel tank construction. Installed in 2013 with a 20yr 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. 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"," - Tanks visually inspected weekly. \n - TCM checks are conducted regularly\n- Site is manned 8 - 4 Monday to Friday, including 2hr cover during weekends, with standby cover for the rest of the time for any alarms and 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. 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. "]
[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 digesters are designed to contain biogas, which can become flammable/explosive when mixed with air.   To prevent this happening, the tank is designed so that air cannot enter.  This is supported by a DSEAR assessment that identifies areas where there is potential for a hazard to develop, there are strict controls on equipment that can be installed or taken into these areas to ensure that there is no potential source of ignition.\nThese design controls are backed up with regular inspections to ensure that tanks and ancillary equipment are in good condition."]
[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\n"]
[null,null,"- Ageing - Tank constructed in 2012 with an minimum design life of 20 years. Likelihood of emissions due to age is 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 - TCM checks are conducted regularly. \n- Site is manned 8 - 4 Monday to Friday, including 2hr cover during weekends, with standby cover for the rest of the time for any alarms and 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 -   A schedule of non-destructive testing and regular checks for leaks mean it is  considered that there is a low likelihood of significant leakage. Any leaks would be contained by the site drainage. The potential for emission is therefore considered low.  "]
[null,null," - Leaks from underground pipework would be emitted to ground. 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 2012 with an 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,"Sludge storage tanks no.3 and 4\n\n2 x 800 m3 working volumes\n\nSpillage of non hazardous sludge: \n - catastrophic failure of tank\n - tank overflow or\n - tank leaks.","Containment:\n- Concrete construction, constructed in 1990 with a 60 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 tanks are partially built into the ground limiting potential spill volumes.\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"," - Tanks visually inspected weekly. \n - TCM checks are conducted regularly. \n- Site is manned 8 - 4 Monday to Friday, including 2hr cover during weekends, with standby cover for the rest of the time for any alarms and 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. Yorkshire Water have never experienced catastrophic failure of concrete tanks built and maintained to the YWS specifications.  Based on the CIRIA risk criteria for concrete tanks, the potential is therefore considered medium."]
[null,null," - Tank overflow or leaks - Due to level monitors and the interlock on 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 1990 with an minimum design life of 60 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 - TCM checks are conducted regularly. \n- Site is manned 8 - 4 Monday to Friday, including 2hr cover during weekends, with standby cover for the rest of the time for any alarms and 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 -   A schedule of non-destructive testing and regular checks for leaks mean it is  considered that there is a low likelihood of significant leakage. Any leaks would be contained by the site drainage. The potential for emission is therefore considered low.  "]
[null,null," - Leaks from underground pipework would be emitted to ground. 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 - the pipework is not routed along areas of potential flammable atmosphere. Likelihood of emissions due to fire or explosion is low"]
[null,null,"- Geological factors - There has been no evidence of wider geotechnical issues during the time the WwTW has been operational on the site.  The tank was designed with geotechnical design input.  Likelihood of emissions due to Geological issues is low"]
[null,null,"- Ageing - The pipework was installed in 1990 with an minimum design life of 50 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,"Dewatering feed tank \n\n1 x 320 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"," - Tank visually inspected weekly. \n - TCM checks are conducted regularly. \n- Site is manned 8 - 4 Monday to Friday, including 2hr cover during weekends, with standby cover for the rest of the time for any alarms and 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 - Tank is 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 - Tank is 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 - Tank constructed in 2002 with an 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 dewatering 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 - TCM checks are conducted regularly. \n- Site is manned 8 - 4 Monday to Friday, including 2hr cover during weekends, with standby cover for the rest of the time for any alarms and 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 -   A schedule of non-destructive testing and regular checks for leaks mean it is  considered that there is a low likelihood of significant leakage. Any leaks would be contained by the site drainage. The potential for emission is therefore considered low.  "]
[null,null," - Leaks from underground pipework would be emitted to ground. 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 - the pipework is not routed along areas of potential flammable atmosphere. Likelihood of emissions due to fire or explosion is low"]
[null,null,"- Geological factors - There has been no evidence of wider geotechnical issues during the time the WwTW has been operational on the site.  The 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 an 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\n8,000 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\n750 kg bag into aging tank and stock tank for the drum thickener, and  centrifuge \n(4 x 3 m3) and blend and transfer tank for the GBT (2 x 5m3) \n\n(Powder Poly for both 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 bulk-bag 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. 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,"- Ageing - The tanks were installed in 2008 and 2009. 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,"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"},{"$f":"IF(D6=\"Low\",\"Class 1\",IF(D6=\"Medium\", \"Class 2\",\"Class 3\"))","v":"Class 2"}]
["Imported sludge buffer tank","High","Low","Medium",{"$f":"IF(D7=\"Low\",\"Class 1\",IF(D7=\"Medium\", \"Class 2\",\"Class 3\"))","v":"Class 2"}]
["Pipework associated with the Imported sludge buffer tank","High","Low","Medium","Class 2"]
["Imported sludge holding tanks","High","Low","Medium","Class 2"]
["Pipework associated with Imported sludge holding tanks","High","Low","Medium","Class 2",null,null,null,null,null," "]
["SAS well / chamber","High","Low","Medium",{"$f":"IF(D11=\"Low\",\"Class 1\",IF(D11=\"Medium\", \"Class 2\",\"Class 3\"))","v":"Class 2"}]
["Pipework associated with the SAS well / chamber","High","Low","Medium",{"$f":"IF(D12=\"Low\",\"Class 1\",IF(D12=\"Medium\", \"Class 2\",\"Class 3\"))","v":"Class 2"}]
["Sludge blending tank ","High","Low","Medium","Class 2"]
["Pipework associated with the Sludge blending tank","High","Low","Medium","Class 2"]
["Digesters","High","Low","Medium","Class 2"]
["Pipework associated with the digesters","High","Low","Medium","Class 2"]
["Sludge storage tanks no.3 and 4","High","Low","Medium","Class 2"]
["Pipework associated with the Sludge storage tanks no.3 and 4","High","Low","Medium","Class 2"]
["Dewatering feed tank no.2 and 3","High","Low","Medium","Class 2"]
["Pipework associated with the Dewatering feed tank no.2 and 3","High","Low","Medium","Class 2"]
["Digested Cake Pad","High","Low","Medium","Class 2"]
["Polyelectrolyte Storage (powder)","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."]