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<p>The Environment Agency requires monitoring of the environmental conditions at shale
gas sites before operations can start in accordance with the environmental permit
granted. This provides a valuable evidence base to compare against monitoring results
taken during and after operations. The type and period of monitoring required after
decommissioning is determined on a site by site basis. It will depend on the risks
associated with the type and scale of activities at a particular site, together with
the local environmental setting.</p><p> </p><p>The Environment Agency will not allow
an operator to surrender their permit until it is satisfied that the well has been
decommissioned in line with the Health and Safety Executive's requirements and either
no pollution has occurred at a site, or if it has, that the site has been returned
to its original condition.</p><p> </p>
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