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Land Gas Risk Assessment

Overview

3.2_overview.jpgLEAP works very closely with a number of Local Authorities, assisting in the prioritising of their sites for investigation under Part 2A EPA 1990. In this example, LEAP undertook a detailed review of three former landfill sites previously identified by the Council as potentially posing a risk to neighbouring properties and/or controlled waters. One of the sites was subsequently discounted on the basis of the desk study and subsequent risk assessment. Two have been the subject of further gas monitoring and risk assessment, for the most part funded by capital grants.

Description and Investigation Design

This particular council, in common with most Local Authorities in Britain, has a number of closed landfills within its Borough, some of which were operated by the Council or its predecessor, and many of which pose a potential risk to human health, neighbouring properties and/ or controlled waters. The problems in this Borough are heightened by the fact that most of its landfills are within quarries which extracted minerals from what are now classified as Principal Aquifers (Chalk and Greensand Formations). The authority had identified a number of closed landfills which in its opinion merited further assessment and possibly further investigation. These were all sites that had had some previous investigation and monitoring carried out by the Local Authority or County Council.

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LEAP Solution

Local Authority budgetary resources are extremely limited currently, but those authorities still have a regulatory duty to identify, investigate and deal with contaminated land. LEAP recognises the need to provide those authorities with low cost, relevant and technically justifiable advice and processes that enable them to effectively identify only those sites which merit intrusive investigation and/or on-going monitoring
LEAP has used its own subcontractors to install monitoring wells, utilising the latest in “gas-clam” technology as well as conventional gas wells and has its own trained field engineers to undertake routine gas monitoring..
LEAP has extensive in-house experience of land fill gas risk assessment and has used that experience here to provide robust advice. LEAP also works closely with internationally recognised practitioners and authors on the subject.
LEAP has assisted the Council in successfully applying for Central Government funding for the intrusive investigations thereby minimising the Council’s own costs.

Local Authority budgetary resources are extremely limited currently, but those authorities still have a regulatory duty to identify, investigate and deal with contaminated land. LEAP recognises the need to provide those authorities with low cost, relevant and technically justifiable advice and processes that enable them to effectively identify only those sites which merit intrusive investigation and/or on-going monitoring

LEAP has used its own subcontractors to install monitoring wells, utilising the latest in “gas-clam” technology as well as conventional gas wells and has its own trained field engineers to undertake routine gas monitoring.

LEAP has extensive in-house experience of land fill gas risk assessment and has used that experience here to provide robust advice. LEAP also works closely with internationally recognised practitioners and authors on the subject.

LEAP has assisted the Council in successfully applying for Central Government funding for the intrusive investigations thereby minimising the Council’s own costs.

Project Overview


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Client

Borough Council, SE England.

Location

Various closed landfill sites, in and around the borough.

Sevices Provided

  • Detailed review of Historic records and reports held by the Borough Council.
  • Qualitative and Quantitative Risk Assessment.
  • Costings in support of DEFRA bids for funding of site investigations
  • Installation and monitoring of gas wells.
  • On-going support to Local Authority Officers

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Added Value

LEAP provided a remediation strategy which based on careful delineation, treatment and then onsite re-use of the majority of the previously contaminated soils served to reduce potential remediation costs by several tens of thousands of pounds.


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