Remediation works involving the E-Clay of hydrocarbon impacted soils and groundwater in-situ using CFA at Waterford, Ireland
Site Overview
The contamination at the site was attributed to the Petrol Station located next to the site. It was considered that leaking pipe work and storage tanks were responsible for the ongoing hydrocarbon contamination to soil and groundwater.
The remediation strategy comprised a three stage approach.
The first stage involved the installation of a low permeability wall along the western and southern boundaries to prevent further ingress of contaminated groundwater from the petrol station.
The second phase involved the bioremediation of contaminated materials associated with the slurry trench barriers and a 0.5m layer from across the top of the site.
The third stage involved the E-Clay stabilisation of soils / groundwater.
Remediation
Envirotreat employed an in-situ soil mixing strategy to remediate approximately 9,200m³ of contaminated soils at the site.
The works were conducted over a period of 3 months under a Site Specific Licence issued by the Environmental Protection Agency.
The in-situ process allows for the remediation of contaminated soils to take place without the need for the contaminated soils to be excavated and stockpiled.
Validation
A number of representative samples of treated soils were taken and leach tested. Leach results were compared to the agreed remediation criteria.
A validation report was prepared on completion of the remediation works.
