Ruddlesden geotechnical

Detailed Quantitative Risk Assessments (DQRA)

Ruddlesden geotechnical employ personnel who are skilled in undertaking Detailed Quantitative Risk Assessments (DQRA), which are sometimes undertaken if the Generic Qualitative Risk Assessment (GQRA) indicated a possible unacceptable risk to the health of site users, but where it is considered that further assessment might show that no or a reduced extent of contamination remediation works would be necessary.

This might include:

  • additional investigation to delineate, vertically or laterally, areas of elevated contamination;
  • additional sampling and testing to allow statistical analyses to be undertaken;
  • more advanced laboratory testing, e.g. speciation, quantification or bioaccessibility; and/ or
  • modifications to the land use or receptor within the CLEA model to produce Site-Specific Assessment Criteria (SSAC).

Case Study

Bioaccessibility Testing Negates Remediation

The chemical laboratory test results obtained as part of a Phase 2 contamination investigation for a proposed residential development in South Devon indicated elevated levels of arsenic to be present in natural soils.

Case Study

Deep Bore Soakaways, Devon

Deep-bore soakaway drains were recommended by Ruddlesden geotechnical following observations made during conventional soakaway testing in accordance with BRE DG 365 at a proposed residential development site in Torbay.