"21. At the New Albion site, the void left from the opencast mining operations is irregularly shaped. 'Overburden' from the opencast mining operations will be used to create a more evenly-shaped cavity for the landfill. The overburden will be compacted and constructed to an engineering specification, and will then form a stable base for the landfill. 22. The irregular shape of the opencast void means that the engineered backfill will vary considerably in thickness across the site. The backfill will be at least 2 m thick at any point around the landfill, and in some places it will be considerably thicker. 23. ... the backfill will have a cushioning effect, protecting the landfill liner in the event of any residual movement in mine workings in the vicinity of the site. 24. A groundwater drainage blanket will be installed above the backfill, together with a drainage system of slotted pipes on the side walls, allowing the groundwater to be drained into specially constructed sumps. From each sump a groundwater abstraction well will be constructed. 25. The landfill liner will then be laid above the groundwater drainage and the underlying foundation layer. The liner will be made of engineered clay, constructed to a strict engineering standard, with a maximum permeability of 1x10-9 metres per second. The clay liner will be at least 2.28 m thick on the base and extending up to 4 m up the sidewalls above the base of the landfill. It will be a least 1 m thick thereafter up to the ground surface. 26. Once the liner has been laid, the engineered void inside the clay liner will have a capacity of 3.9 million m 3. 27. The landfill may accept household, commercial and industrial waste including inert, non-hazardous and stable non-reactive hazardous waste (hazardous waste is excluded unless it can be demonstrated that it is stable and non-reactive). Waste may be accepted at the site at a rate of up to 600,000 tonnes a year with the total quantity of waste to be deposited in the landfill restricted to 5.2 million m 3 as received (after compaction and settlement this must not exceed 3.9 million m 3). 28. The site will be filled in seven 'phases' ... the annual limit on waste importation set out in the Permit will enable the site to be filled before the expiry of the current planning permission in 2014 (ie, within 10 years) ... ."
"7. The proposed landfill site at New Albion is a sub-water table landfill, ie, part of the landfill void in which waste will be placed is situated below the natural level of the surrounding water table. Many sub-water table landfills, including New Albion, are designed and operated on the basis of 'hydraulic containment', which is the practice of maintaining the level of leachate in landfilled waste at a level lower than the surrounding external groundwater. This produces a potential hydraulic gradient into the site that prevents flow of leachate (and therefore contaminants) from the landfill waste out of the site into groundwater. Depending on the permeability of the landfill lining and the magnitude of the inward hydraulic gradient, some groundwater may flow into the landfill, but such designs are intended to avoid such inflow as far as is reasonably possible, recognising that no lining system can be totally impermeable in practice. 8. In effect, hydraulic containment sites rely on maintaining control over groundwater and leachate levels (together with other safeguards) to prevent pollution. Most commonly an inward hydraulic gradient is maintained by pumping out leachate from the landfill to keep the level inside the landfill lower than the groundwater level, and leachate is then treated on site or sent for disposal off site. At some sites, the hydraulic gradient is maintained through the active management of surrounding groundwater levels as well as by pumping of leachate, although at New Albion the long-term operational conditions envisage groundwater levels being allowed to settle at natural rest levels, with only leachate having to be pumped out and treated."
"9. ... about 200 non-hazardous waste landfills in England and Wales entail some or all of the site being below the local water table [of which 40 to 50 are estimated to operate on the principle of hydraulic containment]. This amounts to slightly over a third of existing non-hazardous landfills in England and Wales. In some areas, such as the Midlands (where New Albion is located) and East Anglia, sub-water table landfills may account for as many as two-thirds of authorised landfill sites. The hydrogeological conditions in the UK mean that the operation of landfills under the principle of hydraulic containment is not uncommon. 10. Sub-water table landfills are also found in other EU Member States. From contact with colleagues in other European environment agencies, I am aware that sub-water table landfills can be found, at least, in France, Belgium, the Netherlands and Denmark, although I am not aware of the specific number of sites in each country and whether the types of waste placed in such landfills differs from country to country. 11. Some experts believe that hydraulic containment landfills have environmental benefits compared with landfills situated above the water table, although the Agency approaches matters strictly on a case-by-case basis. The positive features of such landfills include the fact that the inward hydraulic gradient provides a measure of protection against pollution in the event of a failure of the landfill liner. In addition, some sub-water table landfills may be able to benefit from 'flushing', whereby an irrigation system forming part of the leachate management system is used to recirculate leachate through the landfill so as to soak any dry waste, and thereby accelerate the degradation of contaminants."
"Leachate inside the landfill will be allowed to rise to a maximum level of 2 m below the surrounding groundwater. This will maintain an appropriate inward hydraulic gradient, and create conditions of what is called 'hydraulic containment'. Monitoring of groundwater and leachate levels and pumping of leachate, controlled through the Permit and Site Working Plan, will ensure that this hydraulic regime is maintained."
"3.2 Modern landfill sites such as Albion are designed based on the principle of containment. Low permeability materials such as the clay used at Albion are placed to an engineering specification on the base, sides and ultimately the top of the landfill to form seals. A leachate collection layer termed a leachate drainage blanket is placed above the low permeability seal on the base of the landfill. Drains in the leachate drainage blanket convey the leachate to collection points from which the accumulated leachate is removed and either discharged to an off site treatment works such as a sewage works or treated on the site prior to discharge to a sewage works for further treatment or to a watercourse under the terms of a permit issued by the Environment Agency. The leachate drainage system ensures that the depth of leachate in the landfill can be controlled ... 3.3 No material is totally impermeable to water. Materials have a variable capacity to allow water and other fluids to pass through them. Material such as gravel will visibly allow water and other fluids to pass through it whereas material such as clay will not visibly allow fluids to pass through it but it is permeable to a very low degree. The capacity of a material to allow water to pass through it is termed the hydraulic conductivity or coefficient of permeability. A material such as gravel has a high hydraulic conductivity or coefficient of permeability whereas a material such as clay has a low hydraulic conductivity or coefficient of permeability. The rate at which a fluid passes through a material such as clay is controlled by the permeability of the material and the hydraulic gradient across the material which is determined by the relative levels of liquid on either side of the material. It is a well known law of physics that liquids always flow from an area of high hydraulic pressure to an area of low hydraulic pressure. 3.4 The low permeability liner which forms the base, sides and top of a landfill site is placed to an agreed coefficient of permeability and the depth of the leachate in the site is specified in the PPC Permit. By specifying these two key parameters the rate of movement of leachate through the liner can be calculated hence the impact on the environment and specifically on groundwater can be assessed. This risk assessment is termed a hydrogeological risk assessment and forms part of an iterative process of design for the site which ensures that the combination of the proposed low permeability seals and the proposed leachate and groundwater management regimes result in the protection of groundwater quality. As stated in paragraph 3.3 no material is totally impermeable therefore there will always be movement of liquid through a low permeability liner. The task in designing landfill containment is to ensure that to the extent that leachate does move through the liner from the inside of the liner towards the outside it does not result in a breach of relevant legislation or standards. 3.5 ... 3.6 Many of the mineral workings that are restored by landfilling are excavated to a depth below the level of the surrounding groundwater. Typically these sites are sand and gravel extractions which are underlain by clay or excavations in the Coal Measures where there are water bearing horizons above the level of the base of the extraction, such as at Albion Landfill Site. Sites in these hydrogeological circumstances are common in the UK and elsewhere in Europe. 3.7 ... 3.8 ... 3.9 For sites where the base of the landfill is above the groundwater table the leachate which accumulates in the base of the site is always above the level of the underlying groundwater. There is always a driving force causing leachate to flow down at a slow rate through the low permeability liner and through the underlying unsaturated material to the groundwater. ... 3.10 For sites where the natural level of the groundwater in the vicinity is above the base of the site the water in the surrounding strata typically is maintained at a level at or below the base of the extraction or landfill void by pumping until such time as the engineering works to construct the low permeability lining are completed and waste has been placed. Following completion of waste placement groundwater pumping ceases and the groundwater level rises to the natural level. The level of the leachate in the base of the site is maintained at a level which is lower than the level of the groundwater outside the site. This means that there is no driving force for leachate to migrate out of the site to the groundwater. The driving force is for water to flow at a slow rate from outside the site through the low permeability liner and into the waste. This type of landfill is termed a hydraulic containment landfill. ... 3.11 Hydraulic containment landfill sites such as Albion Landfill Site are common in England and Wales. They are present in other parts of Europe where the geological circumstances are similar. The principles for the management of hydraulic containment landfill sites are similar throughout Europe and are not unique to England and Wales nor to Albion Landfill Site."
"(12) Whereas it is necessary to indicate clearly the requirements with which landfill sites must comply as regards location, conditioning, management, control, closure and preventive and protective measures to be taken against any threat to the environment in the short as well as in the long-term perspective, and more especially against the pollution of groundwater by leachate infiltration into the soil." "
"stop to the extent that it is possible to do so using engineering techniques such as those described in paragraph 3 of Annex 1."
"The issue of water entering into a landfill site is extremely important as it concerns not only the formation of leachates but the stability of the site as well. This concern justifies any measures taken to control water entering the site ..."
"Annex I of the Landfill Directive states that appropriate measures should be taken to prevent groundwater from entering the landfilled waste. This measure can be disapplied for landfill sites classified as inert under the Landfill Directive. SEPA interprets this to mean that in most circumstances sub-water table landfills will not be permitted. However, it may be possible for a landfill to be designed so that groundwater could be prevented from entering the landfilled waste although it may enter the engineered site, eg, drainage blankets/layers could be put in place. However, there would be significant sustainability issues associated with any such proposal and any such design should be subject to careful scrutiny."
"(c) Groundwater levels around the disposal facilities are high in relation to the Graving Dock floors. Groundwater flow should a migration path develop through the liner system will be inward with consequently small risk of outward migration of contaminants. ... (d) Pumping boreholes will be provided in the event that liquid levels within the Graving Docks begin to rise and migration of contamination is evident. Pump draw down will, if necessary, maintain positive flow patterns into the docks at all times again protecting the Environment."
"There are a number of difficulties about this submission. First, nobody has hitherto really addressed their minds to this argument or the factual matrix on which the submission is based. I have grave doubts whether water pumped into the system is groundwater for the purpose of the Groundwater Directive see Article 2. I very much doubt whether water entering into a site which has substances in it is covered by the phrase 'the introduction into groundwater of substances'. It is wholly unclear whether there is going to be percolation through ground or subsoil ... "
"I would add that for my part, it seems to me far-fetched in the extreme to suggest that the pumping of water back into the dock could possibly be treated as the introduction into groundwater of substances, quite apart from the fact that I do not think that looking at the definition of groundwater in the directive, water pumped back into the system falls within that definition."
"shall prohibit such activity or shall grant authorisation provided that all the technical precautions necessary to prevent such discharge are observed."
"The prohibition laid down in the first indent of Article 4.1 is general and absolute and applies to discharges of substances in list I without distinguishing between the substances themselves and solutions thereof. That article does not empower the competent authorities of the Member States to determine, on a case-by-case basis and having regard to the circumstances, whether or not discharges have a detrimental effect."
"if the technical precautions relied on here - leachate pumping and off-site disposal - were to stop for whatever reason, there would be immediate direct discharge of list Is into the groundwater..."
"... the result of a failure of the pumping mechanism has been modeled. The landfill design would mean that no discharge to groundwater of list Is outside the edge of the engineered liner would be expected to occur for many months (even if any were present in the landfilled waste), because of the properties of the liner. Systems will be in place to detect any rise in leachate levels so that appropriate remedial action can be taken before any environmental harm occurs."
"(a) the competent authority does not issue a landfill permit unless it is satisfied that: (i) ... the landfill project complies with all the relevant requirements of this Directive, including the Annexes."
"(iv) adequate provisions, by way of a financial security or any other equivalent, on the basis of modalities to be decided by Member States, has been or will be made by the applicant prior to the commencement of disposal operations to ensure that the obligations (including after-care provisions) arising under the permit issued under the provisions of the Directive are discharged and that the closure procedures required by Article 13 are followed. ..."
"Appropriate measures shall be taken, with respect to the characteristics of the landfill and the meteorological conditions, in order to: ... - treat contaminated water and leachate collected from the landfill to the appropriate standard required for their discharge."
"The Operator shall: (a) Put forward options for the treatment and disposal of leachate generated at the Permitted Installation having regard to BAT criteria [within 6 months from the date of this permit]. (b) Identify the best available option and submit a report detailing the proposals to implement it for approval by the Agency within 12 calendar months from commencement of landfilling; unless an alternative date is agreed in writing with the Agency."
"Without actual site data on the quality and quantity of leachate it is not possible to define the exact techniques that would be most appropriate for treatment or disposal options. However, once site specific data on the rate of leachate generation and quality of leachate is available it will be possible to commence a more detailed evaluation of the best option for treating and disposing of leachate from the site as is required in accordance with improvement reference 9.1 b) of the permit. Some of the likely options which are being considered for managing (treating and disposal) of leachate are set out below."
"74. ... At the time of issuing the Permit, we had been satisfied, in particular on the basis of information supplied as part of Onyx's permit application in the working plan ... that appropriate measures would be taken in order to treat leachate collected from the landfill, in accordance with condition 9.1 of the Permit. 75. The point that could not be sensibly decided, before issuing the permit, was the specification of the precise measures for leachate treatment (the permit conditions already control the permitted head of leachate, the infrastructure for extracting leachate, and the infrastructure and methods for monitoring leachate depth and quality). Under the procedures envisaged by Condition 9.1 of the permit, the precise treatment measures will be identified at a date after the commencement of landfilling (Onyx must identify the best available option and submit a report detailing the proposals to implement it for approval by the Agency). 76. This approach enables the assessment of the appropriate measures to be based on the actual quality and quantity of leachate which is generated at the site, and which cannot be known until then."
"The financial provision for meeting the obligations under this Permit set out in the agreement made between the Operator and the Agency dated27th August 2004 shall be maintained by the Operator throughout the subsistence of this Permit and the Operator shall produce evidence of such provision whenever required by the Agency."
"5.12 It is the Applicant's responsibility to meet the costs of the obligations under the Permit, including the costs of aftercare. The Agency has assessed the costs likely to be incurred for a period of 60 years post closure, and has provided for the establishment of a contingency fund thereafter. A Performance Agreement has been entered into between the Applicant and the Agency for the provision of a bond to cover the costs of any steps that the Agency may undertake to remove any imminent risk of serious pollution, or in the event of the Applicant's insolvency. 5.13 The Performance Agreement provides that, in the event of the Applicant being wound up or becoming insolvent, the Agency will require the bond secured under the Agreement to be paid out to the Agency. 5.14 The Performance Agreement will remain in force until the permit is surrendered. After 60 years post-closure has passed, a residual sum that is index-linked will be available for any costs incurred by the Agency, although the Applicant will remain responsible for compliance with the conditions of the Permit until the Permit is surrendered."
"2.5 The Bond shall be enforceable by the Agency upon any of the following events occurring 2.5.1 any work undertaken by the Agency (whether by itself or any other authorised person) pursuant to regulations 26(1) and/or (2) of the PPC Regulations provided that the Agency has in relation to the exercise of powers under regulation 26(2) complied with the requirements of regulations 26(3) and in either case the Agency has served a notice on the Permit holder requesting reimbursement of the Expenses within 5 Business Days of the date of the service of the notice and the Permit holder has failed to pay 2.5.2 failure by the Permit holder to renew the Bond in accordance with Clause 2.2 2.5.3 the Permit holder committing or suffering any act which for the purposes of theInsolvency Act 1986 results in 2.5.4.1 a company voluntary arrangement 2.5.4.2 an administration order 2.5.4.3 a receivership 2.5.4.4 a winding up On the occurrence of the event referred to in Clause 2.5.2 or 2.5.3 the Agency shall be entitled to call upon the entire Bonded Sum (as at the relevant date in accordance with Clause 2.3) and to hold and to use such Bonded Sum if necessary in accordance with its powers under regulations 26(1) and/or (2) of the PPC Regulations in respect of the Permit ..."
" ... it is impractical to make any accurate forecast of landfill time to completion at this stage. Further uncertainties surround the actual cost of aftercare operations that will take place decades into the future. These have been assessed by reference to technologies and techniques available today, but this takes no account of efficiencies and innovations that may be developed during this lengthy period. For all these reasons, a time horizon of 60 years post closure has been subject to specific cost analysis with an in-built contingency to deal with unexpected events. As the uncertainties increase, specific cost analysis becomes less meaningful so a contingency sum is made available thereafter in perpetuity, as a reasonable approach to setting the level of financial provision."
"(1) If the regulator is of the opinion, as respects the operation of an installation ... authorised under these regulations, that the operation of the installation ... or the operation of it in a particular manner, involves an imminent risk of serious pollution, the regulator may arrange for steps to be taken to remove that risk. (2) Where the commission of an offence under regulation 32(1)(a), (b) or (d) causes any pollution the regulator may arrange for steps to be taken towards remedying the effects of the pollution."