Envirotreat Ltd

Envirotreat Ltd

MIXED IN-SITU & EX-SITU PROJECT SUCCESS

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Source: Envirotreat Ltd

Envirotreat Ltd have recently undertaken remedial works at an operating gas governor station to the north of Manchester (UK), that had previously used as a full gas production facility. The voluntary remediation project formed part of the comprehensive programme being undertaken by the Client at a number of old gas production sites across the North West of England.

The first phase of the remediation work was completed at the end of June 2007 and involved the in-situ mass stabilisation of tar impacted soils to a depth of 8 metres below ground level. The process utilised a 900mm diameter mixing tool as part of a Continuous Flight Auger in order to mix E-clay® and cementitious materials to the required depth thereby creating overlapping soil mixed columns that were able to immobilise the contaminants without the need for excavation. This process was especially beneficial when treating the area located between a former gasholder and former tar liquor tank. Overall, 200 soil mixed columns were installed, thereby treating in excess of 1000m3 of contaminated soils in-situ . The treatment was carried carried out within an area that had extremely limited access due to newly installed equipment and services relating to the gas governor facility.

The second phase of the remediation works was completed at the end of July 2007 and involved the ex-situ mass stabilisation of approximately 750 m3 of tarry waste and tar impacted soils recovered from a former tar liquor tank located in close proximity to a major watercourse. Once treated and cured above ground, the soils were placed back into the excavation and compacted in layers thus negating the need for costly off-site disposal. This carefully controlled aspect of the works involved the use of a clay layer to mitigate the risk of pollution migration at the base and to repair the integrity of the brick build base and walls of the tank.

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