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September 16, 2021

Singapore’s first in-situ groundwater pilot and full-scale Site Remediation

Singapore
Manufacturing
Site Investigation & Remediation

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ESC conducted a detailed Environmental Site Assessment in 2009 followed by Singapore’s first in-situ groundwater pilot and full-scale Site Remediation using air sparging and multi-phase extraction technology.

About the Project

The client manufactures and distributes paper and industrial packaging in countries including China, Singapore and Malaysia.  ESC was retained by the client to undertake the remediation of groundwater at a manufacturing facility in Tuas, Singapore. 

Regular independent validation and analysis were performed and soil and groundwater regulations were met after completion of the full-scale remediation in 2016.

Our Approach

ESC conducted a series of environmental site assessments and a groundwater remediation pilot study at the site followed by full-scale site remediation. The remediation system was installed using remedial design services and remediation technologies.

ESC designed the remediation system to address the predominantly dissolved plume of ethyl benzene and xylenes in both soil and groundwater through a combination of air sparging and MPE technology. 

The remediation system comprised of ten large diameter extraction wells, seven air sparging wells, a water treatment system (including settling tanks, a sparging unit and a low-profile air stripping tower), a high-pressure multi-phase vapor extraction system, an infiltration trench designed to deliver iron-free and hydrocarbon acceptable water back to the groundwater and a network of groundwater monitoring wells which were used to monitor system performance.

Outcome

Prior to and upon installation and commissioning of the remediation system, environmental monitoring was conducted including baseline assessment, pre-commissioning groundwater sampling, pre-validation final validation of remediation followed by a full technical report of the remediation process and results at the end of the remediation program. 

The foundation of success for this project was a detailed understanding of the site conditions which resulted in selection of the most appropriate technology to effectively remediate the site.

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