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EPA 1990 Part 2A Investigations


3.4_overview.jpgDetermining land as contaminated under Part 2A of EPA 1990 is both technically and politically challenging. It demands skills outside of traditional site investigation and risk assessment to ensure that a decision can be delivered, and acted upon as required. Leap has brought resolution to a number of recent projects where previous consultants had failed to deliver a robust answer, or had misinterpreted the requirements of the primary legislation and supporting statutory guidance.

Prioritisation and Preliminary Risk Assessment

LEAP has developed a refined risk ranking prioritisation model for the Part 2A process, called SiteScore. The SiteScore model refines the traditional scoring methods used historically in prioritisation to derive risk rankings with greater separation between the low risk and high risk sites.  This allows for a much clearer identification of sites which might fall into Part 2A, and fit with the requirements of the revised statutory guidance for Part 2A (April 2012).

LEAP has also developed an enhanced preliminary risk assessment report called Phase 1+ which is specifically tailored for the preliminary stages of investigations under Part 2A. The report combines traditional desk study elements, with geospatial reporting, statistically robust designs for the preliminary phase of intrusive investigations, and budget costings for those designs.

Description and Investigation Design

Historically the site comprised part of a gas works and was more recently a builder’s yard. Contamination associated with the site’s former use and buried structures including gas holder bases and liquor tanks were anticipated on site. The site is located on a principle aquifer (Chalk) and adjacent to a sensitive tidal river. Redevelopment of the site with housing was proposed.
LEAP was appointed to carry out a review of the previous investigation reports carried out by others and to produce quantitative risk assessments for both human health and controlled waters for the site to provide remedial targets for site clean-up.
Seven intrusive investigations undertaken by various parties had identified elevated levels of petroleum hydrocarbons (TPH), phenols, cyanide and Polyaromatic hydrocarbons (PAH) as well as heavy metals in the shallow soils. Groundwater sampling detected similar contaminants in the shallow groundwater. Slightly elevated levels of TPH, PAH, phenol and metals were also detected in the deep groundwater within the chalk. River water samples both up and downstream of the site contained traces of cyanide.

Part 2A investigations are typically carried out on occupied residential properties, and LEAP projects benefit from using the very latest equipment and technology, together with the vast experience of the project team to minimise disturbance to residents and maximise the value of data collected.

LEAP has direct experience of making Part 2A decisions using DQRA. The skills LEAP provides go beyond the ability to run computer software and involve, instead, a deeper understanding of toxicology, exposure assessment, chemical fate and transport modelling and statistics, and a practical appreciation of the many DQRA tools available to the risk assessor.



LEAP Solution

LEAP are able to draw on their vast contaminated land remediation experience in providing remediation options appraisals, detailed designs and specifications for Part 2A projects, together with tender assistance and evaluation.

LEAP can also provide remediation verification services that are specific to Part 2A projects.

Project Overview



Various Local Authorities



Sevices Provided

  • Site Prioritisation
  • Initial Inspection
  • Site Investigation Design
  • Capital Grant Bidding
  • Initial and Detailed Inspections
  • Detailed Quantitative SPOSH Risk Assessment
  • Remediation Options Appraisal
  • Remediation design and specification
  • Remediation verification


Added Value

LEAP has worked with a number of local authorities to design a framework for the investigation of contaminated land which is particularly suited to investigations under Part 2A of EPA 1990. We have also specifically designed a number of bespoke products and support services to assist in the process with the overall objective of:

  • Controlling Costs,
  • Managing Risks, and
  • Making better decisions