Phase I Desk Study Report

A Phase I Desk Study, also known as a Preliminary Risk Assessment, is the first stage of the site investigation process. It reviews available information to establish whether past activities on the site or nearby land may have caused contamination.

We examine historical Ordnance Survey maps, environmental records, aerial photographs, planning history, geological maps, British Geological Survey borehole records and Environment Agency data. Every Demeter desk study includes a site walkover in the fee.

The findings are brought together in a conceptual site model, identifying potential contaminant sources, pathways and receptors. This provides a clear basis for a targeted, cost-effective investigation where one is needed.

A desk study before purchase can highlight potential liabilities that may affect a site’s value or the cost of development. Commissioning the study before intrusive works helps to:

• Target areas of concern, such as tanks, making efficient use of investigation resources.
• Identify potential geohazards at an early stage.
• Develop a geological model of the site.
• Avoid unnecessary investigation where no potential issues are identified.
• Identify potential contamination and the contaminants that may be present.
• Provide early warning of unusual ground conditions and possible delays.

Our reports combine information about the site’s history, environmental setting and geology from a range of sources.

• Historical Ordnance Survey mapping.
• Environmental data from specialist suppliers, Environment Agency maps and our internal database.
• Planning history for the site and surrounding land.
• A walkover survey on every site.
• Where possible, hand-auger boreholes; trial pits may also be excavated during the walkover where an excavator is provided.
• Published geological maps at 1:50,000 scale and available BGS data.
• Assessment of coal mining risks using mining records and maps.
• Assessment of radon risk.
• A preliminary qualitative risk assessment.
• A conceptual model covering applicable sources, pathways and receptors.
• Detailed proposals for Phase II investigation and, where appropriate, remediation in place of intrusive investigation.

Local authority records and petroleum officer information are obtained where needed, with third-party charges passed on at cost.

The report is designed to support contaminated land planning requirements and give the local planning authority a clear assessment of the site. Where no relevant pollution linkages are identified, further investigation may not be needed, subject to the authority’s acceptance.

If a Phase II investigation is recommended, the report explains its proposed scope. Our service includes subsequent liaison with the local planning authority until the report’s conclusions are accepted, without additional liaison fees.

After internal review and authorisation, a draft is sent to the client and agent together with a quotation for any proposed works. Once the interested parties are satisfied, the final report is issued by email.

The fee depends on the size and location of the site. Contact us for a quotation and impartial advice on meeting your contaminated land planning requirements.

Call Despo on 0151 521 2539 or email despo@demeter-environmental.co.uk.