To assess the hydraulic conductivity (normally called permeability) and porosity of the geology around the site for contaminated liquids and landfill gas, you must include the following details: existing or likely landfill gas component concentrations.present and predicted future gas production rates.hydrogeological risk assessment, or why it is not necessary.short term and long term changes in leachate quality with time.predicted chemical characteristics of the leachate and the likely presence of hazardous substances and non-hazardous pollutants.volumes of leachate that may be stored on site within the cells (the volume below the existing or proposed compliance levels).potential future volumes, based on water balance calculations.volume of leachate you currently generate (if appropriate).topography to 500m from the site boundary.You must include a drawing of the site layout and wastes. phasing – the location, size, depth and shape of any proposed cells and the sequence of tipping.proposed waste types, including proposed volumes, quantities and chemical characteristics of the as-deposited wastes after treatment.historical activities that occurred on site before development.land uses and relative distances from the site.You can include details in a table, for example the: You must include a drawing of the site location in relation to surrounding features. other land uses relevant to assessing the environmental risks from your proposed site – for example any former or current land use that may cause contamination, like spreading sewage sludge.relevant historical waste activity that does not have a permit, including time of operation and waste types.Some pathways and receptors may be both a pathway and receptor. You must include all the pathways the pollution may follow to travel away from the site and all the receptors that could be affected by it. Your CSM must include all the sources of pollution that could impact human health or the environment. You should prepare your documents in the following order. It will also help you decide what risk assessments, design details and management plans you need to send to include in your application. Your CSM will help you identify the likely hazards at your site. sources of pollution (including waste, leachate and landfill gas).It will also help you consider the design and operation of your site before you apply. Your conceptual site model ( CSM) will help the Environment Agency understand the environmental setting of your site. Check the Environment Agency guidance to help you develop your environmental setting and installation design ( ESID) report, including
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