Stabilisation of Naphthalene Contaminated Soils

VertaseFLI was appointed by Neath Port Talbot Council and Costain to undertake remediation works along the route of the Port Talbot Peripheral Distribution Road (PT PDR) scheme, which comprises a new dual carriageway with associated infrastructure and embankment landscaping. 

The route of the PT PDR passes through areas of previously contaminative use. Site investigation and risk assessments identified the requirement for the remediation of shallow soils that were significantly impacted by Naphthalene.  

Project Details


Neath Port Talbot Council & Costain


Port Talbot, South Wales

Project Value



Bench scale design works - 6 weeks, Stabilisation site works - 6 weeks

Services Provided

Stabilisation design works using in-house, laboratory, SuRF sustainability assessment, stabilisation of 6,000m3 of soils, odour monitoring assessment & control

Further Information

Following a remediation options appraisal, stabilisation was identified as the most sustainable and cost effective solution for the site. A bench scale stabilisation treatability trial was undertaken by VertaseFLI, at our in-house laboratory. The trial was highly successful and naphthalene concentrations were reduced to at, or below the laboratory detection limits. In addition, the trial identified several design mixes that would be suitable for the remediation works. Further sustainability assessments and a cost benefit analysis was undertaken to establish the most sustainable design blend with which to undertake the stabilisation works.   

VertaseFLI mobilised to site to undertake the treatment of approximately 6,000m3 of naphthalene contaminated soils. The treated soils were placed, treated and compacted in their final resting place at the base of a new road embankment, under the CL:AIRE Code of Practice Material Management Plan for the site.

As part of the the remediation works, VertaseFLI undertook extensive odour monitoring and control works to mitigate the nuisance caused by naphthalene odours.  Odour suppressant was used to ensure that the concentrations of naphthalene generated by the works were below the stringent health criteria values.


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