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Field Analysis

Overview

2.3overview.jpgLEAP Environmental believes that in using the most up to date techniques both in the field and in the office, clients can be provided with the most accurate and reliable results, in the most timely and cost effective manner. 

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.

LEAP was appointed directly by the regulating London Borough as part of a wider study of contamination in residential gardens adjacent to a former metal plating works under Part 2A of the Environmental Protection Act.  Due to the potentially localised nature of any contamination in the boundary walls, and the desire to minimise disruption to residents, a large amount of field data was collected in a single visit using a handheld XRF analyser.  This is a very cost effective technique, capable of producing very accurate results in a matter of minutes.  The wall contamination was then fully characterised by laboratory analyses of scraped and swabbed samples, which corroborated the findings of the field testing.  

 

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LEAP Solution

By working closely with the client and utilising its experience of the Part 2A regulatory regime, LEAP was able to provide a bespoke investigation, and assessment of a complex problem, as well as remedial solutions. 

 

 

Alternative Uses - Lead Paint Analysis

LEAP is also able to provide rapid field analytical services for a wide range of projects such as Lead Paint Testing in occupied properties and those scheduled for demolition. 

Project Overview


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Client

London Metropolitan Borough

Location

North London

Sevices Provided

  • Intrusive investigation comprising on site and laboratory analysis of boundary wall for heavy metals
  • Factual Investigation Report
  • Derivation of risk assessment model for significant risk of significant harm from wall contamination
  • Interpretative Risk Assessment Report
  • Provision of costed remedial options

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Added Value

 

On site testing was carried out using a portable XRF analyser.  By combining on-site and laboratory analysis, LEAP ensured optimum data collection in a single phase thus minimising disruption to residents, and fieldwork costs to client.

LEAP provided bespoke risk assessments for the wall in the context of the regulatory framework.

LEAP also provided budgets for a range of remedial options for the wall. 

 

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