{"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":23,"macros":1,"external_links":1,"defined_names":56,"comments":4,"pivot_tables":0},"unopened":[],"bounds":{"document_bytes":16777216,"sheet_cells":100000,"rows_first":2000,"rows_last":500,"rows_between":2000,"halvings":0,"cell_chars":16384,"cell_head_chars":4096},"cells_cut":0,"cells_raw":0,"read":"whole","date_system":"1900"}

{"sheet":"Cover","index":0,"n_rows":56,"n_cols":6,"rows_kept":56,"cut":false,"hidden":false,"merged":[]}
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[null,"JOB TITLE",null,null,null,"Yorkshire Water IED Permit"]
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[null,"JOB NUMBER",null,null,null,"331001762-100.2801-4"]
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[null,"MADE BY",null,null,null,"Kiran Parmar"]
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[null,"CHECKED BY"]
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[null,"DATE",null,null,null,"2021-10-05"]
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[null,"Description of spreadsheet",null,null,null,"This spreadsheet provides a secondary containment risk assessment for Aldwarke Sludge Treatment Facility (STF) using the Anaerobic Digestion and Biogas Association (ADBA) secondary containment risk assessment tool. "]
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[null,"Sheet Number prefix",null,null,null,""]
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[null,"Member/Location",null,null,null,""]
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[null,"Drawing Reference",null,null,null,""]
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[null,"Filename",null,null,null,{"$f":"IF(CELL(\"filename\")=\"\",\"\",LEFT(CELL(\"filename\"),FIND(\"]\",CELL(\"filename\"))))","v":"D:\\Process Folders\\Consultation\\YP3592ZU-V005\\[ADBA Secondary Containment Risk Assessment.xlsm]"}]
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[null,"CONTENTS OF SPREADSHEET"]
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[null,"Sheet",null,"Description"]
[null,"Cover"]
[null,"Notes"]
[null,"Introduction",null,"Introduction to the ADBA Tool"]
[null,"1 a) Source",null,"The inventory of materials for Aldwarke STF is provided in the worksheet 1a) Source "]
[null,"1 b) Pathway",null,"The Pathway information for Aldwarke STF is provided in the worksheet 1) b) Pathway "]
[null,"1 c) Receptors",null,"The Receptor information for Aldwarke  STF is provided in the worksheet 1) c) Receptor."]
[null,"2) Site Hazard Rating",null,"The Site Hazard Rating is displayed in the worksheet 2) Site Hazard Rating"]
[null,"3) Likelihood",null,"The likelihood of loss of primary containment and the associated mitigation."]
[null,"4) Site Risk and Classification",null,"The Site Hazard Rating and Classification is in this worksheet"]
[null,"5) Standard Containment Design",null,"The Standard Containment Design is in this worksheet"]
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[null,"AUTHORISATION OF LATEST VERSION"]
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[null,"Type and method of check",null,null,null,"Review of method, inputs and assumptions"]
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[null,"Signatures & dates:",null,null,"Made by ","Kiran Parmar"]
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[null,null,null,null,"Checked "]
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[null,null,null,null,"Approved"]
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[null,"REVISIONS",null,null,"Current Revision "]
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[null,"Rev.","Date","Made by","Checked"," Description"]
[null,"V1","2022-09-02","KP",null,"Initial revision"]

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

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

{"sheet":"1) a) Source","index":3,"n_rows":40,"n_cols":15,"rows_kept":40,"cut":false,"hidden":false,"merged":[[25,1,25,3],[3,12,3,14],[5,12,7,12]]}
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[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,"Indigenous primary and secondary sludge and imported sludge liquid","Liquid",{"$f":"1493*2","v":2986},"m3","Two drum thickener feed  tanks (9 yrs old) and associated pipework","Not flammable","No","Low","H","Permitted waste types are non-hazardous however the volume is significant.",null,null,"100-999","Medium"]
[null,null,null,null,null,null,null,null,"Feedstock Overall Rating","H","Any material with a \"High\" rating means the overall rating is High",null,null,"1000+","High"]
[null,"Process"]
[null,"Thickened sludge","Liquid",{"$f":"500*2","v":1000},"m3","Two digester feed tanks  (44 yrs old) and associated pipework","Not flammable","No","Low","H","Permitted waste types are non-hazardous however the volume is significant."]
[null,"Digesting sludge","Liquid",{"$f":"3167*2","v":6334},"m3","Two digesters (64 yrs old) and associated  pipework","Not flammable","No","Low","H","Permitted waste types are non-hazardous however the volume is significant."]
[null,"Digested sludge","Liquid",{"$f":"700*2","v":1400},"m3","Two  centrifuge feed tanks (28 and 13 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",2800,"tonnes"," Cake pad ","Not flammable","No","Low","M","Largely immobile therefore presents only a medium risk."]
[null,"Digested  sludge liquors","Liquid",1186,"m3","Liquor return balancing tanks (9yrs old) and associated pipework","Not flammable","No","Low","H","Permitted waste types are non-hazardous however the volume is significant."]
[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 – GBT and centrifuge plant","Solid",{"$f":"700*2","v":1400},"kg","Stored above dedicated hopper and bunded as per YW asset standards","Not flammable","No",null,"L","Low ecotoxicity for the quantities stored"]
[null,"Liquid polyelectrolyte –  drum thickening and GBT plant, including centrifuge plant","Liquid",{"$f":"5+2.5+1.5+1.5+5+5","v":20.5},"m3","Stored in tanks and bunded as per YW asset standards","Not flammable","No",null,"L","Low ecotoxicity for the quantities stored"]
[null,"Lubricating oil","Liquid","Small amounts",null,"Fresh or waste oil is stored as per YW asset standards","Flammable","Yes",null,"H","Oil has a high rating volumes used for machine servicing are taken onto and off site when required, with small amounts held in small containers within the installation."]
[null,"Diesel - boiler back-up fuel","Liquid",9.6999999999999993,"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 within the installation area, used for machinery at any one time, etc. and this is handled and stored appropriately by an external contractor."]
[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 within the installation area, used for machinery at any one time, etc. and this is handled and stored appropriately by an external contractor."]
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[null,null,null,null,null,null,null,null,"Chemicals Overall Rating","M","The overall source assessment for additives and site chemicals is  considered to be Medium. IBCs are not kept within buildings and only very small volumes of oils kept on site and this is handled and stored appropriately."]
[null,"Fire fighting agents and cooling water spillages"]
[null,"Fire fighting agents harmful in their own right or contaminated by inventory","Liquid",null,null,null,"Not flammable","No","Low","L","Low in the example in the ADBA Tool."]
[null,"Fire fighting and cooling water contaminated by inventory",null,null,null,null,"Not flammable","No","Low","L","Low in the example in the ADBA Tool."]
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[null,null,null,null,null,null,null,null,"Spillages Overall Rating","L","All the hazards are \"Low\" therefore the overall rating is low"]
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[null,null,null,null,null,null,null,null,"Sources Overall Hazard Rating",{"$f":"IF(OR(J8=\"H\",J15=\"H\",J31=\"H\"),\"H\",IF(OR(,J25=\"M\"=\"M\"),\"M\",\"L\"))","v":"H"}]
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["H"]
["M"]
["L"]

{"sheet":"1) b) Pathway","index":4,"n_rows":101,"n_cols":15,"rows_kept":101,"cut":false,"hidden":false,"merged":[]}
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[null,null,null,null,null,null,null,"Postcode","S65 3SR"]
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[null,"Pathway - the route from primary containment to receptor",null,null,null,"Environmental hazard rating ","Notes","Source","Description","Link","Image","Source","Description","Source","Description"]
[null,"Site layout and drainage"]
[null,"If any of the site inventory has a runoff time of a few minutes…",null,null,null,null,"N/A  - Run-off time is an estimate of how long it would take to flow to the nearest receptor."]
[null,"If any of the site inventory has a runoff time of a few hours.…",null,null,null,"M","It is assumed the site inventory has a runoff time of a few hours  due to the form of sludge and the distance to the receptors. 2D modelling has been completed for Aldwarke STF that identifies sludge has potential to leave the site.  In practice sludge is relative viscous and pooling local to the source of the leak is more likely than a spill spreading significant distances over the course of a few hours."]
[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…"]
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[null,"Topography, geology and hydrology"]
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[null,"Made ground (artificial ground)",null,null,null,"M","Areas of artificial ground are shown to be present to the north, east and west of the installation.  Therefor a Medium Environmental Hazard rating has been selected. ","BGS geoviewer","Made ground  (artificial deposit)  shown as per image.","http://mapapps2.bgs.ac.uk/geoindex/home.html",null,"Stantec (2022) - Aldwarke  STF\nEnvironmental Permit Site Condition Report","The geological map does not indicate the presence of artificial ground beneath the site.\nAreas of artificial ground are shown to be present to the north, east and west of the installation.  To the north the artificial ground is described as infilled ground, this area is coincident with the former lagoons.  To the east the artificial ground is described as an area where the pre-existing (natural or artificial) land surface is raised by artificial deposits, this area is coincident with the steel works site.  To the west the artificial ground is described as both infilled and raised artificial deposits and appears to be coincident with the areas of refuse tips, spoil heaps and open cast workings shown on the historical mapping (refer to Section 3). \nIt is likely, given the history of the area, that variable and potentially significant thicknesses of Made Ground comprising a mixture of cohesive and non-cohesive materials are present across the  much of the installation area and its surroundings, reflecting reworked natural strata, demolition materials derived from sequential site development, and sewage related substrate including the historical presence of sludge beds.","Stantec (2021) Aldwarke Sewage Treatment Works Ground Engineering Desk Study Report [Project Name\tYW 331001314 AMP7 EBPR Aldwarke STW]","The geological map does not indicate the presence of artificial ground across the site.\nAreas of infilled ground are shown to be present immediately north of the site, with infilled land and Made Ground shown to the west of the site, appearing to be coincident with the areas of refuse tips and spoil heaps shown on the historical mapping (refer to Section 4)."]
[null,"Alluvium - Superficial deposits - Secondary A aquifer",null,null,null,"M","A Medium Environmental Hazard Rating has been selected as Alluvium deposits are shown across the site, which may be soft and high compressibility. ","BGS geoviewer","Alluvium (Gravel, Sand, Silt and Clay)","http://mapapps2.bgs.ac.uk/geoindex/home.html",null,"Stantec (2022) - Aldwarke  STF\nEnvironmental Permit Site Condition Report","Superficial deposits of Alluvium are mapped beneath the whole of the installation area.  The BGS Lexicon (BGS, 2022) describes Alluvium as “Normally soft to firm consolidated, compressible silty clay, but can contain layers of silt, sand, peat and basal gravel.” ","Stantec (2021) Aldwarke Sewage Treatment Works Ground Engineering Desk Study Report [Project Name\tYW 331001314 AMP7 EBPR Aldwarke STW]","Superficial deposits of Alluvium associated with the River Don are shown to be present across the whole of the site.\nThe BGS Lexicon (BGS, 2021) describes Alluvium as “Normally soft to firm consolidated, compressible silty clay, but can contain layers of silt, sand, peat and basal gravel”."]
[null,"Pennine Lower Coal Measures - Bedrock - Secondary A aquifer",null,null,null,"M"," A Medium Environmental Hazard Rating has been selected owing to the majority of the installation area is underlain by the Pennine Middle Coal Measures Formation.","BGS geoviewer","Majority: PENNINE MIDDLE COAL MEASURES FORMATION - MUDSTONE, SILTSTONE AND SANDSTONE\nMinor: OAKS ROCK - SANDSTONE","https://magic.defra.gov.uk/MagicMap.aspx",null,"Stantec (2022) - Aldwarke  STF\nEnvironmental Permit Site Condition Report","The installation and surrounding area is underlain by Pennine Middle Coal Measures (Coal Measures), which is described by the BGS (BGS 2022) as “interbedded grey mudstone, siltstone, pale grey sandstone and commonly coal seams, with a bed of mudstone containing marine fossils at the base, and several such marine fossil-bearing mudstones in the upper half of the unit”.  \nOaks Rock – Sandstone (part of the Coal Measures) is mapped to be present immediately to the south east of the installation. ","Stantec (2021) Aldwarke Sewage Treatment Works Ground Engineering Desk Study Report [Project Name\tYW 331001314 AMP7 EBPR Aldwarke STW]","The whole of the site is shown to be underlain by mudstone, siltstone and sandstone deposits of the Middle Coal Measures Formation, described by the BGS (BGS, 2021) as “interbedded grey mudstone, siltstone, pale grey sandstone and commonly coal seams, with a bed of mudstone containing marine fossils at the base, and several such marine fossil-bearing mudstones in the upper half of the unit”.\nThe Swinton Pottery Coal is indicated to outcrop along the site’s southern boundary. This coal seam is indicated to be between 0.1 m and 2.1 m thick.\nThree coal seams are indicated to outcrop to the north of the site, as follows:\n•\tMeltonwood Coal, outcrops approximately 100 m north-west of the site, indicated to be up to 2.3 m thick.\n•\tTwo-Foot (Royston; Half Yard) Coal, outcrops approximately 190 m north-west of the site, indicated to be between 0.1 m and 2.1 m thick.\n•\tAdby (Winter) Coal, outcrops approximately 350 m north-west of the site, indicated to be between 0.0 m and 1.9 m thick.\nThe geological map indicates that the Middle Coal Measures Formation in the vicinity of the site dips to the south-east at an angle of 20 degrees. On this basis, the coal seams that outcrop to the north of the site are likely to be present at depth beneath the site. The shallowest of these is likely to be the Meltonwood Coal which is anticipated to be present beneath the site at a depth of approximately 36 m."]
[null,"River Don",null,null,null,"M","The River Don  running downstream east of the WwTW, is situated within the 'Don from River Rother to River Dearne Water Body 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 medium  risk has been selected as the 2D modelling for Aldwarke STF identifies sludge does not leave the site.","Catchment Data Explorer (CDE)"," 'Moderate' ecological status. ","https://environment.data.gov.uk/catchment-planning/WaterBody/GB104027057452",null,"Stantec (2022) - Aldwarke  STF\nEnvironmental Permit Site Condition Report","At its closest point the River Don is located approximately 25 m to the south of the installation boundary and is also continuously present to the south at varying distances up to approximately 190 m at its furthest point.  The river flows in an easterly and north easterly direction in the vicinity of the installation. \nOS mapping shows the Blackwater Dyke is present approximately 45 m north east of the site (at it closest point) and flows southwards following the alignment of Aldwarke Lane, to a confluence with the River Don approximately 100 m to the south east.  \nThere is likely to be hydraulic continuity between underlying groundwater and the surface water features.","Stantec (2021) Aldwarke Sewage Treatment Works Ground Engineering Desk Study Report [Project Name\tYW 331001314 AMP7 EBPR Aldwarke STW]","The River Don is located immediately south of the site and flows towards the north-east. \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. \nThe various channelised sections of the River Don flow towards the north-east, entering the River Ouse at Goole approximately 41km to the north-east, and the Aire and Calder Navigation (a canalised section of the Rivers Aire and Calder) approximately 34km to the north-east.\nContemporary mapping indicates that the Blackwater Dyke is present approximately 220 m north-east of the site (at most proximal) and flows southwards following the alignment of Aldwarke Lane, to a confluence with the River Don approximately 260 m east of the site."]
[null,"Mitigation - do these apply?"]
[null,"Some secondary and tertiary containment system is present (see Likelihood assessment)"]
[null,"Majority of spills will be contained within the hard surfaced and drained areas and returned to the WwTW for treatment. \n"]
[null,"2D modelling for Aldwarke STF identifies no routes to river or watercourse, mitigations have been proposed to contain the spill.\n"]
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[null,null,null,null,"Path & Mitigation Overall Rating","M","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  (failure of all tank installation areas) would   leave the site via a potential routes. However, the majority of the sludge would be contained within hard surfaced and drained areas and returned to the WwTw for treatment. PondSim cannot  model these features and due to its limitation. Mitigation modelling has been completed and solutions effectively contains spills on site."]
[null,"Climatic conditions"]
[null,"Annual rainfall < 1000 mm",null,831,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/gcqzwq04e"]
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[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 requires 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 of any gas flows in the event of gas release, such as in a fire.\n - If firefighting was needed on the site the site drainage system returns surface water to treatment within the WwTW.\n - Fire water is therefore not  considered to be a pathway risk. \n- The CIRIA736 compliant containment system that will be installed at Aldwarke will have a capacity that allows for containment of firewater."]
[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 majority of the site is classed as Flood Zone 2.","EA Flood Map for Planning","The Aldwarke site is mostly classified as a Flood Zone 2 (medium risk of flooding)",null,null,"Stantec (2022) - Aldwarke  STF\nEnvironmental Permit Site Condition Report","The EA’s Flood Map for Planning shows that the whole of the site is located within a Flood Zone 2, defined by the EA as land assessed as having between a 1 in 100 and 1 in 1,000 annual probability of river flooding (1% – 0.1%), in any year. This area is not shown to be within an area benefiting from flood defences.  Parts of the installation, have been subject to flooding in recent years as a result of the River Don exceeding its channel capacity.  Some of the infrastructure within the installation is raised above ground level as a mitigation against flooding.\nThe EA’s map of surface water flooding indicates that limited areas within the installation are susceptible to surface water flooding. ","Stantec (2021) Aldwarke Sewage Treatment Works Ground Engineering Desk Study Report [Project Name\tYW 331001314 AMP7 EBPR Aldwarke STW]","The EA’s Flood Map for Planning shows that the whole of the site is located within a Flood Zone 2, defined by the EA as land assessed as having between a 1 in 100 and 1 in 1,000 annual probability of river flooding (1% – 0.1%), in any year.\nThe EA’s surface water flood risk map indicates that the majority of the site is located within an area of Very Low (less than 1 in 1000 [<0.1%] annual probability) surface water flood risk.\nScattered areas within the site, typically either access roads or existing tanks, are located within areas of Low (between 1 in 1000 [0.1%] and 1 in 100 [1.0%] annual probability) and Medium (between 1 in 100 [1.0%] and 1 in 30 [3.3%] annual probability) surface water flood risk."]
[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","L"]
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[null,null,null,null,"Pathway Overall Hazard Rating","M"]
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["H"]
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["L"]

{"sheet":"1) c) Receptors","index":5,"n_rows":99,"n_cols":20,"rows_kept":99,"cut":false,"hidden":false,"merged":[]}
[]
[null,null,null,null,null,null,null,null,null,null,null,"Postcode","S65 3SR"]
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[null,"Receptors","Within","units",null,null,null,null,null,"Environmental hazard rating ","Notes","Source","Description","Link","Image","Source","Description","Source","Description","Source"]
[null,"Watercourses and bodies"]
[null,"River Don",25,"m",null,null,null,null,null,"M","The River Don  running downstream east of the WwTW, is situated within the 'Don from River Rother to River Dearne Water Body 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. There is also an area of arable and broadleaved, mixed and yew woodland to the south of the site,  and improved grassland to the north of the site. Therefore, a High Environmental Hazard Rating has been selected. ","Drinking Water Safeguard Zones and NVZs","Surface Water S262 - RIVER DON (FROM ROTHER TO DEARNE) NVZ","https://environment.data.gov.uk/farmers/",null,"Catchment Data Explorer (CDE) ","This waterbody has an overall  ecological status of 'Moderate' and  a chemical status of 'Fail'.  ","https://mapapps2.bgs.ac.uk/ukso/home.html?layer=CEHLCM2015",null,"Stantec (2022) - Aldwarke  STF\nEnvironmental Permit Site Condition Report"]
[null,"Secondary A aquifers and soilscape","Beneath site",null,null,null,null,null,null,"M","Classified as a Secondary A aquifer, therefore medium environmental hazard rating. \n","MAGIC Landscape Geology and Soils Aquifer Designation Map (Superficial drift), groundwater vulnerability, and Soilscape map (England), BGS Geoviewer ","Secondary A Classification Medium\nTypologySecondary A\nAquifer Designation Map (Superficial Drift) (England)\nTypology Secondary A\nGroundwater Vulnerability Map (England)\nClassificationMedium\nSoilscape (England) reference 17, 20\n","https://magic.defra.gov.uk/MagicMap.aspx http://mapapps2.bgs.ac.uk/geoindex/home.html"]
[null,"Pennine lower coal measures - Bedrock ","Beneath site",null,null,null,null,null,null,"M","Classified as a medium environmental hazard rating. No nearby Source protection zones. It is assumed that the groundwater in the bedrock will be in hydraulic connection to the made ground, superficial deposits and the surface water features and has an environmental hazard rating as Medium - High. ","MAGIC Landscape Geology and Soils Aquifer Designation Map (Bedrock) (England), BGS Geoviewer ","Secondary A Classification Medium\nTypologySecondary A\nAquifer Designation Map (Superficial Drift) (England)\nTypology Secondary A\nGroundwater Vulnerability Map (England)\nClassificationMedium\nSoilscape (England) reference 17, 20\n","https://magic.defra.gov.uk/MagicMap.aspx http://mapapps2.bgs.ac.uk/geoindex/home.html"]
[null,"Abstraction","N/A","m",null,null,null,null,null,"L","There are no active surface water abstraction licences within 500 m.  ","Magic map Source Protection Zones merged (England)","Magic map: No SPZs",null,null,"Stantec (2021) Aldwarke Sewage Treatment Works Ground Engineering Desk Study Report [Project Name\tYW 331001314 AMP7 EBPR Aldwarke STW]","The Envirocheck Report indicates that there are two recorded surface water abstraction permits issued within 500 m of the site, as follows:\n•\tRef: 2/27/07/042, located approximately 70 m to the south-west of the site. This permit is now revoked, but previously allowed the abstraction of up to 191 m3 per day of surface water by the British Waterways Board for “General Industrial” purposes.\n•\tRef: 2/27/07/045, located approximately 470 m to the west of the site. This permit is now revoked, but previously allowed the abstraction of up to 682 m3 per day of surface water by the British Waterways Board for “Unclassified (other)” purposes."]
[null,"Aldwarke Sewage Works Local Wildlife Site (LWS) ",10,"m",null,null,null,null,null,"M","Aldwarke Sewage Works Local Wildlife Site (LWS) to the north, west and south surrounding the installation,  at its closest point is adjacent to the north of the installation. ","Stantec (2022) - Aldwarke  STF\nEnvironmental Permit Site Condition Report","The following sensitive land uses have been identified within 10 km (statutory designations) and 2 km (non statutory designations) of the installation:\nStatutory:\n•\tThere are no statutory designations within 10 km of the installation boundary. \n\nNon-statutory:\n•\tAldwarke Sewage Works Local Wildlife Site (LWS) to the north, west and south surrounding the installation, at its closest point is adjacent to the north of the installation. \n•\tThrybergh Tip LWS is located approximately 1.8km to the north east at its closest point.\n•\tListerdale Wood LWS is located approximately 1.8km to the south east.\n•\tNew Stubbin Colliery and Stubbin Incline LWS is approximately 1.8km to the north east."]
[null,"Thrybergh Tip LWS ",1.8,"km",null,null,null,null,null,"L","Thrybergh Tip LWS is located approximately 1.8km to the north east at its closest point.","Stantec (2022) - Aldwarke  STF\nEnvironmental Permit Site Condition Report","The following sensitive land uses have been identified within 10 km (statutory designations) and 2 km (non statutory designations) of the installation:\nStatutory:\n•\tThere are no statutory designations within 10 km of the installation boundary. \n\nNon-statutory:\n•\tAldwarke Sewage Works Local Wildlife Site (LWS) to the north, west and south surrounding the installation, at its closest point is adjacent to the north of the installation. \n•\tThrybergh Tip LWS is located approximately 1.8km to the north east at its closest point.\n•\tListerdale Wood LWS is located approximately 1.8km to the south east.\n•\tNew Stubbin Colliery and Stubbin Incline LWS is approximately 1.8km to the north east."]
[null,"Listerdale Wood LWS",1.8,"km",null,null,null,null,null,"L","Listerdale Wood LWS is located approximately 1.8km to the south east.","Stantec (2022) - Aldwarke  STF\nEnvironmental Permit Site Condition Report","The following sensitive land uses have been identified within 10 km (statutory designations) and 2 km (non statutory designations) of the installation:\nStatutory:\n•\tThere are no statutory designations within 10 km of the installation boundary. \n\nNon-statutory:\n•\tAldwarke Sewage Works Local Wildlife Site (LWS) to the north, west and south surrounding the installation, at its closest point is adjacent to the north of the installation. \n•\tThrybergh Tip LWS is located approximately 1.8km to the north east at its closest point.\n•\tListerdale Wood LWS is located approximately 1.8km to the south east.\n•\tNew Stubbin Colliery and Stubbin Incline LWS is approximately 1.8km to the north east."]
[null,"New Stubbin Colliery and Stubbin Incline LWS ",1.8,"km",null,null,null,null,null,"L","New Stubbin Colliery and Stubbin Incline LWS is approximately 1.8km to the north east.","Stantec (2022) - Aldwarke  STF\nEnvironmental Permit Site Condition Report","The following sensitive land uses have been identified within 10 km (statutory designations) and 2 km (non statutory designations) of the installation:\nStatutory:\n•\tThere are no statutory designations within 10 km of the installation boundary. \n\nNon-statutory:\n•\tAldwarke Sewage Works Local Wildlife Site (LWS) to the north, west and south surrounding the installation, at its closest point is adjacent to the north of the installation. \n•\tThrybergh Tip LWS is located approximately 1.8km to the north east at its closest point.\n•\tListerdale Wood LWS is located approximately 1.8km to the south east.\n•\tNew Stubbin Colliery and Stubbin Incline LWS is approximately 1.8km to the north east."]
[null,"LNR and SSSI",">3","km",null,null,null,null,null,"L","The following sites are located more than 3 km from the installation: \nCentenary Riverside (LNR)\nBradgate Brickworks (SSSI)\nScholes Coppice and Keppel's Field (LNR)\nFirbsy resevour (LNR)\nWarren Vale (LNR)","MAGIC Land and Marine Based Statutory Designations",null,"https://magic.defra.gov.uk/MagicMap.aspx"]
[null,"WwTW",50,"m",null,null,null,null,null,"L","The WwTWs is a very large operation.  Direct impact on operation is extremely unlikely as sludge would not accumulate to a depth where there was risk of disruption to control cabinets or other assets. "]
[null,null,null,null,null,null,null,null," Overall Rating","M","Justification: None of the above include High Environmental Hazard Rating"]
[null,"Habitation"]
[null,"Commerical / industrial",70,"m",null,null,null,null,null,"L","There are multiple industrial / commercial sites surrounding the installation in all directions, the closest (excluding the WwTW) is approximately 70m to the east of the installation boundary at the closest point.","Stantec (2022) - Aldwarke  STF\nEnvironmental Permit Site Condition Report"]
[null,"Hospitals / healthcare facilities",1.4,"km",null,null,null,null,null,"L","Shakespeare Road Medical Centre is located approximately 900 m to the south west.  There are two health centres located approximately 1.4 km and 2 km to the north west and south west respectively.  A rehabilitation centre is located approximately 1.4 km to the south of the installation boundary.","Stantec (2022) - Aldwarke  STF\nEnvironmental Permit Site Condition Report"]
[null,"Schools",600,"m",null,null,null,null,null,"L","There are 23 schools within approximately 2km of the installation.  The nearest of these is approximately 600 m to the south east.","Stantec (2022) - Aldwarke  STF\nEnvironmental Permit Site Condition Report"]
[null,"Residences",100,"m",null,null,null,null,null,"M","North - approx. 800 m to the north west of the boundary.\nEast - approx. 450 m to the south east of the boundary.\nSouth - approx. 350 m to the south of the boundary.\nWest - approx. 100 m to the west of the boundary.","Stantec (2022) - Aldwarke  STF\nEnvironmental Permit Site Condition Report"]
[]
[null,null,null,null,null,null,null,null,"Habitation Overall Rating","M","Justification: Residences in close proximity to the STF"]
[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(J16=\"H\",J23=\"H\",J25=\"H\"),\"H\",IF(OR(J16=\"M\",J23=\"M\",J25=\"M\"),\"M\",\"L\"))","v":"M"},null,"  "," "]
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["H"]
["M"]
["L"]

{"sheet":"2) Site Hazard Rating","index":6,"n_rows":106,"n_cols":5,"rows_kept":106,"cut":false,"hidden":false,"merged":[[12,1,12,3],[3,1,3,4]]}
[]
[]
[]
[null,"Calculated hazard ratings:"]
[null,"Source","Pathway","Receptor","Site Hazard Rating"]
[null,{"$f":"'1) a) Source'!J34","v":"H"},{"$f":"'1) b) Pathway'!F40","v":"M"},{"$f":"'1) c) Receptors'!J28","v":"M"},{"$f":"IF(E106<6,\"Low\",IF(E106<10,\"Medium\",\"High\"))","v":"High"}]
[]
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[]
[null,"Possible Combination",null,null,"Site Hazard Rating"]
[null,"L","L","L","Low"]
[null,"M","M","L","Low"]
[null,"H","L","L","Low"]
[null,"M","M","M","Medium"]
[null,"H","M","L","Medium"]
[null,"H","H","L","Medium"]
[null,"H","M","M","High"]
[null,"H","H","M","High"]
[null,"H","H","H","High"]
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[null,"Rating lookup table"]
[null,"L",1]
[null,"M",2]
[null,"H",3]
[]
[null,"This assessment score"]
[null,{"$f":"VLOOKUP(B6,B101:C103,2,FALSE)","v":3},{"$f":"VLOOKUP(C6,B101:C103,2,FALSE)","v":2},{"$f":"VLOOKUP(D6,B101:C103,2,FALSE)","v":2},{"$f":"B106*C106*D106","v":12}]

{"sheet":"3) Likelihood","index":7,"n_rows":255,"n_cols":9,"rows_kept":255,"cut":false,"hidden":false,"merged":[[157,4,168,4],[103,5,115,5],[157,1,168,1],[157,3,168,3],[157,5,168,5],[116,1,129,1],[116,3,129,3],[116,4,129,4],[116,5,129,5],[103,1,115,1],[103,3,115,3],[103,4,115,4],[130,1,142,1],[130,3,142,3],[130,4,142,4],[130,5,142,5],[62,5,75,5],[35,1,48,1],[35,3,48,3],[35,4,48,4],[35,5,48,5],[62,3,75,3],[62,1,75,1],[62,4,75,4],[20,6,20,7],[49,1,61,1],[49,3,61,3],[49,4,61,4],[49,5,61,5],[22,1,34,1],[22,3,34,3],[22,4,34,4],[22,5,34,5],[143,1,156,1],[143,3,156,3],[143,4,156,4],[143,5,156,5],[76,1,88,1],[76,3,88,3],[76,4,88,4],[76,5,88,5],[89,1,102,1],[89,3,102,3],[89,4,102,4],[89,5,102,5],[195,1,207,1],[195,3,207,3],[195,4,207,4],[195,5,207,5],[169,1,181,1],[169,3,181,3],[169,4,181,4],[169,5,181,5],[182,1,194,1],[182,3,194,3],[182,4,194,4],[182,5,194,5]]}
[]
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[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)"]
[]
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[]
[null,"Risk ","Description of Risk","UNMITIGATED LIKELIHOOD \n","Mitigation applied","MITIGATED LIKELIHOOD",null,"L","Site Overall Likelihood"]
[null,"Drum thickener feed tanks\n2x 1,493 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 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. \n- The site is designed to drain towards the site centre, away from identified Receptors. \n- The tank is surrounded by permeable and impermeable hardstanding which drains to the inlet pumping station and would return spills for treatment.","M"," - Weekly TCM checks, including visual inspection.\n - Site is manned 7am to 7pm, with 24 hr standby for any alarms or issues.\n - Assets are subject to non destructive testing (NDT).  The schedule for this is determined by the age of the asset and the findings of previous asset inspections.  Where problems are identified, they are rectified to ensure that the tank remains safe for continued operation.\n - Daily site task instruction ensures the areas of the site are inspected for any environmental or process risks. \n - The EMS contains procedures for tank failures.\n - Minor to moderate spills will be cleaned up before there has been sufficient time for infiltration into the ground.  Note that YW have committed to install a full CIRIA 736 compliant containment system at Aldwarke, this will eliminate spills to permeable surfaces..\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.  Note that YW have committed to install a full CIRIA 736 compliant containment system at Aldwarke, this will eliminate spills to permeable surfaces..\n\n\n\n\n\n\n\n\n\n\n","L"]
[null,null,"Failure risk:"]
[null,null," - Catastrophic tank failure - The tanks are new and of medium working volumes. Yorkshire Water have never experienced catastrophic failure of steel tanks build and maintained to the YWS specifications.  Based on the CIRIA risk criteria for steel tanks, the potential is therefore considered medium."]
[null,null," - Tank overflow or leaks - Due to level monitors and the interlock on 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 lip 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 2013 with a 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 structures within the are therefore unlikely to be struck by lightning.  Likelihood of emissions due to lightning is low."]
[null,"Pipework associated with drum thickener feed tanks\n\n - Spillage of non hazardous sludge: catastrophic failure and leaks from pipework.","Containment: \n- All pipelines, valves and screens are made from steel.\n-Thickener feed pipe and thickened sludge pipe are over impermeable surfacing that falls to the site drainage.\n-Sludge thickeners are contained within a water-tight trough situated over impermeable surfacing that falls to the site drainage.\n- Isolation valves are present at each end of pipe sections. This allows the isolation of leaking or failed pipe sections and limits the volume released.","M"," - Weekly TCM checks, including visual inspection.\n - Site is manned 7am to 7pm, with 24 hr standby for any alarms or issues.\n - Non Destructive Testing is carried out every 5 years on all ancillary assets. \n - Daily site task instruction ensures the areas of the site are inspected for any environmental or process risks. \n - The EMS contains procedures for pipework failures.\n - Minor to moderate spills will be cleaned up before there has been sufficient time for infiltration into the ground.  Note that YW have committed to install a full CIRIA 736 compliant containment system at Aldwarke, this will eliminate spills to permeable surfaces..\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.  Note that YW have committed to install a full CIRIA 736 compliant containment system at Aldwarke, this will eliminate spills to permeable surfaces..","L"]
[null,null,"Failure risk:"]
[null,null," - Catastrophic pipe failure -  As a result of a schedule of non-destructive testing the potential for catastrophic failure is considered low."]
[null,null," - Leaks from over ground pipework -   Pipes are pressure tested when installed and regularly checked for leaks once in operation.  Any leaks would be contained by the site drainage. the potential for emission is therefore considered low."]
[null,null," - Leaks from underground pipework would be emitted to ground. Underground pipes are designed and maintained to Yorkshire Water specifications. The risk of emission due to leaks is therefore considered to be low. "]
[null,null,"- Catastrophic failure of pipe joints and flanges, particularly downstream of the pumps - Any sudden loss of pressure related to a catastrophic pipe failure would be identified by the site SCADA system resulting all pumping being stopped and an alarm on the site SCADA system, therefore reducing any emissions. Likelihood of emissions due to catastrophic pipe failure is considered medium. "]
[null,null,"-Shortcomings or failure in operational control system: the site is maintained inline with a proactive maintenance schedule and the EMS to ensure ongoing operation of all plant items. Operators are trained in the running of plant items. Likelihood of emissions due to operational failure is low."]
[null,null,"- Abuse - All site staff and tanker operators are trained to operate the tank. No risk of overflow, due to level monitors and the interlock on feed pumps. Likelihood of emissions due to abuse is low."]
[null,null,"- Impact - the pipework is protected by bollards or kerbs between the tank and site road.  Likelihood of emissions due to impacts low."]
[null,null,"- Vandalism, etc. - the pipework is within the fenced and gated site, monitored via security surveillance.  Likelihood of emissions due to vandalism is low."]
[null,null,"- Fire, explosion - Pipe content is not flammable.  The pipework is not routed through areas where an explosive atmosphere is likely to develop. Likelihood of emissions due to fire or explosion is low."]
[null,null,"- Geological factors - There has been no evidence of wider geotechnical issues during the time the WwTW has been operational on the site.  The pipework was designed with geotechnical design input.  Likelihood of emissions due to geological issues is low."]
[null,null,"- Ageing - The pipework was installed in 2013 with a minimum design life of 25 years. They are regularly monitored to check for leakages and material failure. Likelihood of emissions due to age is low"]
[null,null,"- Lightning strike - the pipework is low relative to other structures within the area therefore unlikely to be struck by lightning.  Likelihood of emissions due to lightning is low"]
[null,"Digester feed tanks\n2 x 500 m3 working volume\n\nSpillage of non hazardous sludge: \n - catastrophic failure of tank\n - tank overflow or\n - tank leaks.","Containment:\n- Concrete tank construction. Constructed in 1988 with a 60 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. ","M"," - Weekly TCM checks, including visual inspection.\n - Site is manned 7am to 7pm, with 24 hr standby for any alarms or issues.\n - Assets are subject to non destructive testing (NDT).  The schedule for this is determined by the age of the asset and the findings of previous asset inspections.  Where problems are identified, they are rectified to ensure that the tank remains safe for continued operation.\n - Daily site task instruction ensures the areas of the site are inspected for any environmental or process risks. \n - The EMS contains procedures for tank failures.\n - Minor to moderate spills will be cleaned up before there has been sufficient time for infiltration into the ground.  Note that YW have committed to install a full CIRIA 736 compliant containment system at Aldwarke, this will eliminate spills to permeable surfaces..\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.  Note that YW have committed to install a full CIRIA 736 compliant containment system at Aldwarke, this will eliminate spills to permeable surfaces..\n\n\n\n\n\n\n\n\n\n\n","L"]
[null,null,"Failure risk:"]
[null,null," - Catastrophic tank failure - This tanks is 34 years old with a design life of 60 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 5 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 1988 with a 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 digester feed tanks\n\n - Spillage of non hazardous sludge: catastrophic failure and leaks from pipework.","Containment: \n- All pipelines, valves and screens are made from steel.\n- 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.","L","- Pipework is lagged to prevent freezing.\n- Weekly TCM checks, including visual inspection.\n - Site is manned 7am to 7pm, with 24 hr standby for any alarms or issues.\n - Non Destructive Testing is carried out every 5 years on all ancillary assets. \n - Daily site task instruction ensures the areas of the site are inspected for any environmental or process risks. \n - The EMS contains procedures for pipework failures.\n - Minor to moderate spills will be cleaned up before there has been sufficient time for infiltration into the ground.  Note that YW have committed to install a full CIRIA 736 compliant containment system at Aldwarke, this will eliminate spills to permeable surfaces..\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.  Note that YW have committed to install a full CIRIA 736 compliant containment system at Aldwarke, this will eliminate spills to permeable surfaces..  ","L"]
[null,null,"Failure risk:"]
[null,null," - Catastrophic pipe failure -  As a result of a schedule of non-destructive testing the potential for catastrophic failure is considered low."]
[null,null," - Leaks from over ground pipework -   Pipes are pressure tested when installed and regularly checked for leaks once in operation.  Any leaks would be contained by the site drainage. the potential for emission is therefore considered low.  "]
[null,null," - Leaks from underground pipework would be emitted to ground. The pipes are build with secondary containment with the pipework set in the concrete base of the tanks.  This is designed and maintained to the Yorkshire Water specifications. The risk of emission due to leaks is therefore considered to be low. "]
[null,null,"- Catastrophic failure of pipe joints and flanges, particularly downstream of the pumps - Any sudden loss of pressure related to a catastrophic pipe failure would be identified by the site SCADA system resulting all pumping being stopped and an alarm on the site SCADA system, therefore reducing any emissions. Likelihood of emissions due to catastrophic pipe failure is considered low. "]
[null,null,"- Shortcomings or failure in operational control system: The site is maintained inline with a proactive maintenance schedule and the EMS to ensure ongoing operation of all plant items. Operators are trained in the running of plant items. The risk of emission of sludge is considered low"]
[null,null,"- Abuse - All site staff and tanker operators are trained to operate the plant items. HAZOP studies have been undertaken as part of the design process. No risk of overflow, due to level monitors and the interlock on feed pumps. Likelihood of emissions due to abuse is low."]
[null,null,"- Impact -  The pipework located safely away from site road.  Likelihood of emissions due to impacts low."]
[null,null,"- Vandalism, etc. - the pipework is within the fenced and gated site, monitored via security surveillance.  Likelihood of emissions due to vandalism is low."]
[null,null,"- Fire, explosion - Pipe content is not flammable.  The pipework is not routed through areas where an explosive atmosphere is likely to develop. Likelihood of emissions due to fire or explosion is low."]
[null,null,"- Geological factors - There has been no evidence of wider geotechnical issues during the time the WwTW has been operational on the site.  The pipework was designed with geotechnical design input.  Likelihood of emissions due to geological issues is low."]
[null,null,"- Ageing - The pipework was installed in 1988 with a minimum design life of 25 years. They are regularly monitored to check for leakages and material failure, and is subject to regular NDT to confirm that it remains suitable for use. 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 3,167 m3 \n[2 x 2,820 m3 above ground volume]\n\nSpillage of non hazardous sludge: \n - catastrophic failure of tank\n - tank overflow or\n - tank leaks.","Containment:\n - Concrete tank construction. Installed in 1968 with a 60yr minimum design life.   \n- Digester tank 1 emptied, cleaned and inspected in 2013.  Digestion tank 1&2 are both due for full inspection in 2023\n - Approx. 10% of the tanks storage capacity is below ground level.  This  reduces the volume of liquid that would be rapidly released in the unlikely event of tank failure.\n - High level alarms linked to site SCADA control program and interlock to stop pumping into the tanks if high level reached. Foam radar present.\n- The site is designed to drain towards the site centre, away from identified Receptors. ","M"," - Weekly TCM checks, including visual inspection.\n - Site is manned 7am to 7pm, with 24 hr standby for any alarms or issues.\n - Assets are subject to non destructive testing (NDT).  The schedule for this is determined by the age of the asset and the findings of previous asset inspections.  Where problems are identified, they are rectified to ensure that the tank remains safe for continued operation.\n - Daily site task instruction ensures the areas of the site are inspected for any environmental or process risks. \n - The EMS contains procedures for tank failures.\n - Minor to moderate spills will be cleaned up before there has been sufficient time for infiltration into the ground.  Note that YW have committed to install a full CIRIA 736 compliant containment system at Aldwarke, this will eliminate spills to permeable surfaces..\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.  Note that YW have committed to install a full CIRIA 736 compliant containment system at Aldwarke, this will eliminate spills to permeable surfaces. .\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 concrete tanks built and maintained to 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 tanks are designed to generate biogas, a mix of methane and carbon dioxide.  Under normal operating conditions, this mix is not flammable.  A DSEAR assessment has been completed and compliant equipment installed in areas where abnormal conditions have potential to create a flammable atmosphere. Likelihood of emissions due to fire or explosion is low."]
[null,null,"- Geological factors - There has been no evidence of wider geotechnical issues during the time the WwTW has been operational on the site.  The tank was designed with geotechnical design input.  Likelihood of emissions due to geological issues is low."]
[null,null,"- Ageing - Tank constructed in 1968 with a minimum design life of 60 years.  The risk of failure is controlled through a combination of operational and maintenance checks on tank integrity.   Likelihood of emissions due to age is medium."]
[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 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 permeable surfacing.\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 is lagged to prevent freezing.\n - Weekly TCM checks, including visual inspection.\n - Site is manned 7am to 7pm, with 24 hr standby for any alarms or issues.\n - Non Destructive Testing is carried out every 5 years on all ancillary assets.\n - Daily site task instruction ensures the areas of the site are inspected for any environmental or process risks. \n - The EMS contains procedures for pipework failures.\n - Minor to moderate spills will be cleaned up before there has been sufficient time for infiltration into the ground.  Note that YW have committed to install a full CIRIA 736 compliant containment system at Aldwarke, this will eliminate spills to permeable surfaces..\n","L"]
[null,null,"Failure risk:"]
[null,null," - Catastrophic pipe failure -  As a result of a schedule of non-destructive testing the potential for catastrophic failure is considered low."]
[null,null," - Leaks from over ground pipework -   Pipes are pressure tested when installed and regularly checked for leaks once in operation.  Any leaks would land on permeable surfaces. the potential for emission is therefore considered medium."]
[null,null," - Leaks from underground pipework would be emitted to ground. The pipes are build 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 import tank. HAZOP studies have been undertaken as part of the design process. No risk of overflow, due to level monitors and the interlock on feed pumps. Likelihood of emissions due to abuse is low."]
[null,null,"- Impact - The 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 - Pipework from the digesters falls into two categories, 1. Pipework containing sludge, 2. Pipework containing biogas.  This report only considers pipes containing sludge.  The risk of fire and explosion in sludge containing pipework is medium as sludge is not flammable and pipework is designed to prevent build up of flammable gases within it. "]
[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 - Pipework constructed in 1962 with a minimum design life of 50 years. Likelihood of emissions due to age is medium, risk is controlled through regular operational and maintenance checks on pipe integrity. \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 and lightning protection installed. Likelihood of emissions due to lightning is low."]
[null,"Digested sludge storage tanks (centrifuge feed tanks)\n\n2 x 700 m3 working volumes\n\nSpillage of non hazardous sludge: \n - catastrophic failure of tank\n - tank overflow or\n - tank leaks.","Containment:\n- Concrete and steel construction, constructed in 1994 and 2009 respectivley 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 tank are 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 permeable landscaping.","M"," - Weekly TCM checks, including visual inspection.\n - Site is manned 7am to 7pm, with 24 hr standby for any alarms or issues.\n - Assets are subject to non destructive testing (NDT). The schedule for this is determined by the age of the asset and the findings of previous asset inspections.  Where problems are identified, they are rectified to ensure that the tank remains safe for continued operation.\n - Daily site task instruction ensures the areas of the site are inspected for any environmental or process risks. \n - The EMS contains procedures for tank failures.\n - Minor to moderate spills will be cleaned up before there has been sufficient time for infiltration into the ground.  Note that YW have committed to install a full CIRIA 736 compliant containment system at Aldwarke, this will eliminate spills to permeable surfaces.\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.  Note that YW have committed to install a full CIRIA 736 compliant containment system at Aldwarke, this will eliminate spills to permeable surfaces. \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 steel tanks, the potential is therefore considered medium.",null,null,null,null," "]
[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 1994 and 2009 with a 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 (centrifuge feed tanks)\n\n - Spillage of non hazardous sludge: catastrophic failure and leaks from pipework.","Containment: \n- All pipelines, valves are made from steel and single-skinned\n- Centrifuge feed tank inlet pipework are above ground and over permeable surfacing.\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 is lagged to prevent freezing\n - Weekly TCM checks, including visual inspection.\n - Site is manned 7am to 7pm, with 24 hr standby for any alarms or issues.\n - Non Destructive Testing is carried out every 5 years on all ancillary assets.\n - Daily site task instruction ensures the areas of the site are inspected for any environmental or process risks. \n - The EMS contains procedures for pipework failures.\n - Minor to moderate spills will be cleaned up before there has been sufficient time for infiltration into the ground.  Note that YW have committed to install a full CIRIA 736 compliant containment system at Aldwarke, this will eliminate spills to permeable surfaces.\n","L"]
[null,null,"Failure risk:"]
[null,null," - Catastrophic pipe failure -  As a result of a schedule of non-destructive testing the potential for catastrophic failure is considered low."]
[null,null," - Leaks from over ground pipework -   Pipes are pressure tested when installed and regularly checked for leaks once in operation.  Any leaks would be fall on permeable surfacing, therefore the potential for emission is therefore considered medium. "]
[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. 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 tanks. No risk of overflow, due to level monitors and the interlock on feed pumps. Likelihood of emissions due to abuse is low."]
[null,null,"- Impact -  The pipework  is protected by bollards between the tank and tanker unloading point and site road.  Likelihood of emissions due to impacts low."]
[null,null,"- Vandalism, etc. - the pipework is within the fenced and gated site, monitored via security surveillance.  Likelihood of emissions due to vandalism is low."]
[null,null,"- Fire, explosion - Pipe content is not flammable.  The pipework is not routed through areas where an explosive atmosphere is likely to develop. Likelihood of emissions due to fire or explosion is low."]
[null,null,"- Geological factors - There has been no evidence of wider geotechnical issues during the time the WwTW has been operational on the site.  The pipework was designed with geotechnical design input.  Likelihood of emissions due to geological issues is low."]
[null,null,"- Ageing - The pipework was installed in 1994 and 2009 with a minimum design life of 25 years. They are regularly monitored to check for leakages and material failure. Pipework is subject to regular NDT to confirm that it remains suitable for use. 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,"Liquor return balancing tank\n\n1,186 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 2013 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 vented 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 and permeable surfaces which drains to the inlet pumping station which would return spills for treatment.","M"," - Weekly TCM checks, including visual inspection.\n - Site is manned 7am to 7pm, with 24 hr standby for any alarms or issues.\n - Assets are subject to non destructive testing (NDT).  The schedule for this is determined by the age of the asset and the findings of previous asset inspections.  Where problems are identified, they are rectified to ensure that the tank remains safe for continued operation.\n - Daily site task instruction ensures the areas of the site are inspected for any environmental or process risks. \n - The EMS contains procedures for tank failures.\n - Minor to moderate spills will be cleaned up before there has been sufficient time for infiltration into the ground.  Note that YW have committed to install a full CIRIA 736 compliant containment system at Aldwarke, this will eliminate spills to permeable surfaces.\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.  Note that YW have committed to install a full CIRIA 736 compliant containment system at Aldwarke, this will eliminate spills to permeable surfaces. \n\n\n\n\n\n\n\n\n\n\n","L"]
[null,null,"Failure risk:"]
[null,null," - Catastrophic tank failure - Tanks are subject to regular inspection. Yorkshire Water have never experienced catastrophic failure of steel tanks build and maintained to the YWS specifications.  Based on the CIRIA risk criteria for steel tanks, the potential is therefore considered medium."]
[null,null," - Tank overflow or leaks - Due to level monitors and the interlock on 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 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 2013 with a minimum design life of 20 years. Likelihood of emissions due to age is low."]
[null,null,"- Lightning strike - Lightning risk assessment has been carried out on site. Likelihood of emissions due to lightning is low."]
[null,"Pipework associated with the liquor return balancing tanks\n\n - Spillage of non hazardous sludge: catastrophic failure and leaks from pipework.","Containment: \n- All pipelines, valves are made from steel and single-skinned.\n- Dewatering feed tank inlet pipework are above ground and over impermeable surfacing that falls to the site drainage.\n- Isolation valves are present at each end of pipe sections. This allows the isolation of leaking or failed pipe sections and limits the volume released.","M"," - Pipework is lagged to prevent freezing.\n - Weekly TCM checks, including visual inspection.\n - Site is manned 7am to 7pm, with 24 hr standby for any alarms or issues.\n - Non Destructive Testing is carried out every 5 years on all ancillary assets.\n - Daily site task instruction ensures the areas of the site are inspected for any environmental or process risks. \n - The EMS contains procedures for pipework failures.\n - Minor to moderate spills will be cleaned up before there has been sufficient time for infiltration into the ground.  Note that YW have committed to install a full CIRIA 736 compliant containment system at Aldwarke, this will eliminate spills to permeable surfaces.\n","L"]
[null,null,"Failure risk:"]
[null,null," - Catastrophic pipe failure -  A schedule of non-destructive testing the potential for catastrophic failure is considered low."]
[null,null," - Leaks from over ground pipework -   Pipes are pressure tested when installed and regularly checked for leaks once in operation.  Any leaks would be contained by the site drainage. The potential for emission is therefore considered low."]
[null,null," - Leaks from underground pipework would be emitted to ground. The outlet from the tank runs a short distance below ground and is not secondary contained.  This is designed and maintained to the Yorkshire Water specifications. The risk of emission due to leaks is therefore considered to be medium. "]
[null,null,"- Catastrophic failure of pipe joints and flanges, particularly downstream of the pumps - Any sudden loss of pressure related to a catastrophic pipe failure would be identified by the site SCADA system resulting all pumping being stopped and an alarm on the site SCADA system, therefore reducing any emissions. Likelihood of emissions due to catastrophic pipe failure is considered medium. "]
[null,null,"- Shortcomings or failure in operational control system: The site is maintained inline with a proactive maintenance schedule and the EMS to ensure ongoing operation of all plant items. Due to the significant flow of sludge through these process items the risk of emission of sludge is considered medium."]
[null,null,"- Abuse - All site staff and tanker operators are trained to operate the import tank. No risk of overflow, due to level monitors and the interlock on feed pumps. Likelihood of emissions due to abuse is low."]
[null,null,"- Impact -  The pipework  is protected by bollards between the tank and tanker unloading point and site road.  Likelihood of emissions due to impacts low."]
[null,null,"- Vandalism, etc. - the pipework is within the fenced and gated site, monitored via security surveillance.  Likelihood of emissions due to vandalism is low."]
[null,null,"- Fire, explosion - Pipe content is not flammable.  The pipework is not routed through areas where an explosive atmosphere is likely to develop. Likelihood of emissions due to fire or explosion is low."]
[null,null,"- Geological factors - There has been no evidence of wider geotechnical issues during the time the WwTW has been operational on the site.  The pipework was designed with geotechnical design input.  Likelihood of emissions due to geological issues is low."]
[null,null,"- Ageing - The pipework was installed in 2013 with a minimum design life of 30 years. They are regularly monitored to check for leakages and material failure. Pipework is subject to regular NDT to confirm that it remains suitable for use. 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\n\n2,800 tonnes \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 and is of low environmental risk when used in a controlled manner. 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. Likelihood of emmisions is low."]
[null,null,"Lightning strike - Sludge cake is a generally immobile substance. Any impact from a lightning strike, which is not considered likely to occur in this area, will not result in loss of containment. Likelihood of emissions due to lightning is low."]
[null,"Polyelectrolyte storage (solid and liquid)\n\n1 m3 IBC's into \n1 x 5 m3 and 1 x 2.5 m3 make up tanks for drum thickening, and 1 x 25 kg bag into into 2 x 1.5 m3 make up tanks for GBT.\n\n(Powder and liquid poly for thickening)\n\nEmission of polymer (powder, liquid and make-up) from tank\nleaching of polymer to groundwater","Containment:\n - Polyelectrolyte is used to treat the sludge prior to thickening.  \n - Liquid polyelectrolyte is delivered to site and loaded into a GRP bulk storage tank and bunded as per YW asset standards.  \n - Spillage of polymer liquid will be contained within the polymer handling area (bunded area within the thickening building / area) and it will not spread further.  ","L","N/A","L"]
[null,null,"Failure risk:"]
[null,null,"- Catastrophic containment failure - Polymer is stored in a bulk storage tank and pumped into the make-up system, which is within its 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 polymer plant was installed in 2008 with a minimum design life of 20 years for the tank. 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,"Polyelectrolyte Storage (solid and liquid)\n\n2 x 700 kg bags into 2 x 5 m3 make up tanks for centrifuging. \n\n(Powder and liquid poly for dewatering)\n\n\nEmission of polymer (powder and make-up) from tank, leaching of polymer to groundwater","Containment:\n - Polyelectrolyte is used to treat the sludge prior to 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 dewatering building / area) and it will not spread further.   ","L","N/A","L"]
[null,null,"Failure risk:"]
[null,null,"- Catastrophic containment failure - Powder polymer is stored in big-bag and emptied into the make-up system, which is within its 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 polymer plant was installed in 2009. Likelihood of emissions due to age is low."]
[null,null,"- Lightning strike - Site wide lightning conductor remedial works undertaken in 2017.  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":94,"n_cols":5,"rows_kept":94,"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(D94<3,\"Low\",IF(D94<5,\"Medium\",\"High\"))","v":"Medium"},{"$f":"IF(D6=\"Low\",\"Class 1\",IF(D6=\"Medium\", \"Class 2\",\"Class 3\"))","v":"Class 2"}]
["Drum thickener feed tanks","High","Low","Medium",{"$f":"IF(D7=\"Low\",\"Class 1\",IF(D7=\"Medium\", \"Class 2\",\"Class 3\"))","v":"Class 2"}]
["Pipework associated with the drum thickener feed tanks","High","Low","Medium","Class 2"]
["Digester feed tanks","High","Low","Medium","Class 2"]
["Pipework associated with the digester feed tanks","High","Low","Medium","Class 2"]
["Digesters","High","Low","Medium","Class 2"]
["Pipework associated with the digesters","High","Low","Medium","Class 2"]
["Digested sludge storage tanks (Centrifuge feed tanks)","High","Low","Medium","Class 2"]
["Pipework associated with the digested sludge storage tanks (Centrifuge feed tanks)","High","Low","Medium","Class 2"]
["Liquor return balancing tank","High","Low","Medium","Class 2"]
["Pipework associated with the liquor return balancing tank","High","Low","Medium","Class 2"]
["Digested cake pad","High","Low","Medium","Class 2"]
["Polyelectrolyte storage (solid and liquid) for thickening","High","Low","Medium","Class 2"]
["Polyelectrolyte storage (solid and liquid) for dewatering","High","Low","Medium","Class 2"]
["Lubricating oil storage","High","Low","Medium","Class 2"]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
["Rating lookup table"]
["Low",1]
["Medium",2]
["High",3]
[]
[{"$f":"VLOOKUP(B6,A90:B92,2,FALSE)","v":3},{"$f":"VLOOKUP(C6,A90:B92,2,FALSE)","v":1},null,{"$f":"A94*B94","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."]