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Additional ground investigation underway at Lotte World site in Seoul

Arup and the Korean Geotechnical Society have been appointed by Lotte Engineering and Construction to investigate whether extension of an indoor theme park in Korea has triggered “sinkhole” formations that are draining a nearby lake.

Additional ground investigations have now been launched at the Lotte World site in Jamsil, southern Seoul after water levels in the nearby Seokchon Lake started to fall at the end of 2011 and coincided with the completion of the first phase of excavation work at the site. Work on site started in March 2011.

The Lotte World site lies close to the the Han River where up to 15m of alluvial deposits can overlay the bedrock of granite and gneiss.

The current phase of investigation follows on from the findings of an advisory committee earlier this month, comprising of Seoul City officials and other experts, which suggested that the construction may be the cause of the falling water level in the lake.

According to a report in the Korea Herald, an official at Lotte Group has said that Arup was involved in the design of the original civil engineering for the project and will be undertaking a further study of the project and the environmental changes at the site over the next four months. The official also said that the Korean Geotechnical Society will investigate the cause of the water-level change.

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