Agenda with Maps and Applications (21Mb) - pdf - Selby District ...

contamination associated with former land uses at the site.
Having reviewed the historical Ordnance Survey extracts
presented as an Appendix within the AIGC report, Wilbourn
Associates concur with this view.
• No visual or olfactory evidence of contamination was noted
during AIGC's ground investigation.
• In terms of contamination AIGC conclude that based on an
inspection of the historical plans, the site has not previously
been occupied by any potentially contaminative land uses.
Furthermore, no significant made ground or gross contamination
was identified during the ground investigation and that no
significant ground remediation is anticipated. Based on the
information provided by AIGC Wilbourn Associates concur with
these conclusions.
• Wilbourn Associates would recommend that if unforeseen
contamination is detected during the course of the
redevelopment then Selby District Council should be informed in
the first instance.
• AIGC conclude that although the site is at negligible risk from
landfill gas from known landfill sites and is unlikely to be affected
by mines gas emissions, basic radon protective measures are
required within new dwellings at the site. Wilbourn Associates
agree with these conclusions.
• In terms of coal mining the site has been affected by subsidence
due to past coal mining and it is understood that remedial
drainage works have been carried out. However, subsidence
associated with the known deep mining should now be complete
and further movements should only occur if the ground is
subjected to significant surcharge. Loadings associated with
residential developments are not significant in this respect.
Wilbourn Associates are not specialists in this field and given
the time lapse since the acquisition of the Coal Authority report
would advise that they are contacted to obtain further
information.
• As the site is located in a Radon Affected area and
recommendations have been made for basic radon protection
measures, the developer should ensure that the following is
carried out:
o use of 1200 gauge polyethylene DPM or DPC with
suspended concrete floors or ground bearing floor slabs;
o continuous membrane across cavity walls;
o cavity tray in external walls; and fully sealed service
entries/exits.
In addition on completion of the development written
confirmation, accompanied by photographic evidence, should
be provided by the developer to Selby District Council to confirm
that this has been carried out.
• As the ‘Geoenvironmental Appraisal’ report has revealed that
the site has been affected by subsidence due to past coal
mining and it is understood that remedial drainage works have
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