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CASE STUDY: TAR AND CHEMICAL WORKS REMEDIATION

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CASE STUDY: TAR AND CHEMICAL WORKS REMEDIATION
Client: Major Developer
Value: £3,000,000
Activities: Bio-remediation, dual phase, LNAPL, recovery, demolition, earthworks
Site History
The former Chemical Works had been active since the turn of the century and involved in the production of various chemicals including solvents, general hydrocarbons, heavy oil fractions and tar distillation.  It was proposed to redevelop the site for housing and VertaseFLI Limited were contracted to undertake the remedial works.  The site has been impacted by BTEX, PAH’s, diesel and general hydrocarbons.  In addition there are areas of tar contamination in both the solid and liquid state. 

Soil Treatment
Whilst the tar contamination will be removed from site all other soils are to be treated on site.  It was essential that prior to the biological treatment of the material the soil was excavated and prepared by screening and crushing before classification segregation and construction into treatment windrows.  The windrows were placed on impermeable liner and treated in accordance with our Mobile Treatment Licence. Over 100000m3 of soils were subjected to ex-situ bio remediation.

Water Treatment
In addition to the Ex-situ treatment a temporary groundwater barrier was installed pre-main works in order to isolate the groundwater, collect and recover free product and prevent back migration of water contamination from off site. 
 
In addition the site made ground has been drained of water and effluent and treated on site.  Groundwater will be controlled and treated on site for the duration of the works

Ongoing works 
Following completion of the excavation of each site zone an in-situ treatment system was designed and installed to treat dissolved phase hydrocarbon contamination. A total of four systems were installed to treat the groundwater over an area of 300000m2 to pre-agreed targets. These operate 24 hours a day 7 days a week without attendance and uses SMS to monitor system status.

 

                         
      
   


















































































































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