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8.2.2 Planned Response at known Contaminated Sites 97


98


At the one known contaminated site, at Tuddenham St Martin, a site investigation will be undertaken to establish the extent and nature of contamination.


This could take the form of boreholes or window samples to assess ground conditions, laboratory analysis of soil samples to identify contaminants and the concentrations these are present at, installation of monitoring wells to allow future monitoring of groundwater and ground gases, and laboratory analysis of groundwater samples.


99


Once these data are available, the contaminant type shall be properly classified, and appropriate measures for mitigation impacts shall be outlined within a Contamination Assessment and Mitigation Scheme (under Requirement 24, Schedule A, Part 3 of the draft DCO). This Scheme will be submitted, following consultation with the Environment Agency, for approval to the Local Authority prior to the specified Works commencing.


8.3 Encountering Unexpected Contamination


100 Site managers would be instructed in the potential for encountering unexpected contamination, and made aware of the procedure should such an event occur. The site manager would be provided with contact details of an environmental advisor who can provide telephone advice as to whether construction needs to be halted to allow a site inspection to be undertaken.


101


In the event that unexpected contamination is encountered, work in the area will cease on instruction by the Site Manager or delegate and be contained and made as safe as reasonably practical pending assessment by suitably qualified environmental consultants, consultation with the local authority and the Environment Agency (EA), and agreement on plans for further investigation and remediation measures where necessary.


102


The environmental consultant will visit the site, if necessary, and determine what action is required to allow construction to recommence. It may be necessary to collect soil or water samples for laboratory analysis. Some types of contamination may need to be removed to ensure the safety of construction workers, in which case this will be advised by the environmental consultant.


103 Where necessary, laboratory analysis will be completed (on an expedited turnaround, where possible), allowing conclusions to be reached as to whether material needs to be removed from the construction area.


Outline Code of Construction Practice . Version 3.


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