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Services for Local Authorities


3.5_overview.jpgLEAP has a series of bespoke risk modelling and ranking products which can be used to assess and prioritise the relative environmental risks on sites, with a view to targeting resources. In this example, LEAP undertook a site condition survey for a series of County Council highways depots to assist in their prioritisation for remedial work. The work was undertaken in two phases: the first phase comprised a Preliminary Risk Assessment for each site, with particular reference to the Environment Agency Pollution Prevention Guidelines. The second phase comprised a risk prioritisation study to identify which, if any, sites and activities posed the greatest risk.

Prioritisation and Preliminary Risk Assessment

The Council had a number of highway depot sites across the county which had historically been operated by both the Council and various subcontractors. As part of a previous study, various potential sources of contamination had been identified within each of the individual sites, but the Council had been unable to assess which, if any, represented a significant risk to both the site users and the surrounding environs. In particular, given the usual budget constraints, the Council required a robust methodology for assessing risk on each site and across the depots as a whole, and for further ranking these risks. The study was to enable the Council to make budget decisions for any remedial work.



LEAP Solution

LEAP have had extensive experience working with local authorities on their Part 2A prioritisation work, specifically assisting in the risk ranking of sites to enable identification of the most potentially contaminated sites. LEAP therefore successfully applied a similar methodology to the highway depots.

The Environment Agency have published Pollution Prevention Guidelines for a variety of potentially contaminative uses including PPG10 for Highway Depots, as well as above and below ground tanks, vehicle washing, refuelling facilities, oil separators etc. The guidelines were used as a baseline for the detailed desk study, walkover survey and environmental risk assessment for each individual depot. On the basis of these findings, risk scores were attributed to the depots following the source, pathway, receptor strategy similar to that used for Part 2A sites, enabling the sites to be prioritised both in terms of individual potentially contaminative land uses within each depot and across the depot sites as a whole.

LEAP used the results of the risk prioritisation report to provide remedial recommendations and preliminary cost estimates for further work if necessary.

Project Overview



County Council


Various highway depots within the county

Sevices Provided

  • Detailed desk study including review of records held by the County Council.
  • Walkover survey with particular reference to Environment Agency Pollution Prevention Guidelines
  • Qualitative Risk Assessment for each individual site.
  • Quantitative Risk Prioritisation report including risk ranking exercise for individual sites as well as across the depots
  • Intrusive Investigation Specifications and Costing
  • Recommendations for Remedial Work.


Added Value

  • LEAP used its expertise and experience with Part 2A studies to undertake a similar risk ranking exercise for the highways' depots.
  • LEAP was able to draw on its extensive experience of investigation, remediation, and construction to provide budget estimates for further work.