Phase 1 Land Contamination Desk Study Assessments comprise the collation of desk based data together with information gained from a site walkover survey. This provides an initial overview of the nature and extent of Geo-technical or contamination hazards that may exist on a property.
The desk study typically includes a review of historical maps and aerial photographs, consideration of the geological and hydro-geological setting of the site from published sources, contact with regulatory authorities and retrieval of information from database resources.


These are critical in revealing potential ground hazards such as potentially contaminating land uses (current and historic), pollution incidents, mining hazards, naturally occurring radon gas, etc.


They also help to understand the wider environmental setting of the site so that potential receptors to land contamination, such as groundwater and surface water resources, can be identified. The Desk Study provides information on the potential liabilities a site poses, from a qualitative viewpoint.

Land Contamination Desk Study Assessment and 

Site Investigation Report

JOMAS Associates Ltd provide Phase 1 Land Contamination Desk Studies, mainly, for four reasons;


  • To meet planning conditions issued by the local authorities contaminated land officer;

  • As a due diligence precautionary measure prior to purchase of either residential or commercial land or property;

  • To support the Permitted Development Rights - Prior Notification Application;

  • To meet the request of a lender before funds are released.

The Site Walkover allows the site and its surroundings to be inspected. It includes an assessment for potential indicators of contamination, such as distressed vegetation, discoloured soils, polluted water and waste materials (including asbestos if present).
Potential ground problems can thus be identified during the walkover.

Due Diligence

To support the land pre-purchase due diligence process, we conduct site appraisals to determine potential abnormal development costs.
We identify worst case remediation costs for dealing with identified contamination, as well as providing our client with options for minimising remediation costs to allow for a feasible development.

Jomas prepare all Phase I desk study reports in accordance with CLR11, BS10175 and BS5930 - we have not had a report rejected by a Local Authority to date.
The information from the Phase 1 Land Contamination assessment is used to develop a “Conceptual Site Model”, which forms the basis for the Phase 2 Land Contamination intrusive investigation, should one be considered necessary.