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Subsidence in Cheddar

Property owners identified the sudden appearance of a circular subsidence feature in the garden area of an existing property, adjacent to the building which measured approximately 3m in diameter. The surface covering (paving slabs/subbase etc). had collapsed in to the feature.

We undertook a detailed geotechnical phase 1 desk study reviewing information that included historical mapping, a geological report, geological maps and memoirs, available online information associated with the local area which included information on surface mineral extraction (quarrying) and underground cave systems.

 

Our Desk Study identified that the site was located on the bedrock that comprised the Mercia Mudstone Marginal Facies, a formation that is known for the risks posed by solution features. Geological boundaries with the Avon Group (Limestones and Mudstones) and the Portishead Formation (Sandstones) were identified in close proximity.

 

A subsequent walkover of the site and immediate area, identified a number of other possible subsidence features, ponds and anomalous ground conditions that were suggestive of the wider impact of solution features in the local area. A limited ground investigation was undertaken and was aimed at only identifying the likely risk of locating an excavator adjacent to the feature to allow its excavation. Our exploratory site investigation comprised a combination of windowless sampling and dynamic probing to record ground conditions and insitu ground strengths.

A ground model comprising limited Made Ground underlain by the weathered Mercia Mudstone Marginal Facies was identified. Variable in-situ ground strengths were recorded, including zones of very low strength soils in two locations to a maximum depth of 11m. This information suggested that whilst the surface expression of the feature measured approximately 3m, the likely zone of influence extends much further.

Our recommendations to the Client that placement of any plant to investigate the feature could not be recommended without further assessment of the investigation risks. At present, ESP continue to work with the Client to assess the site and allow the formulation of a remedial strategy.

 

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Get in touch with our team via our email, enquiries@earthsciencepartnership.com or phone number, 02920 813385  and we’ll be very happy to help with and discuss any geotechnical engineering project requirements you may have.

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Subsidence feature in Cheddar

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Simon Lewis
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Earth Science Partnership recently completed an independent geo-environmental review for us and I have been extremely impressed with both the quality of their work and the professionalism of the team. The report was comprehensive, balanced and technically robust, helping us navigate a complex evidence base and identify the key issues requiring further consideration. Just as importantly, ESP were approachable and willing to engage constructively with questions arising from the draft report. Special thanks to Daniel Thomas for his time, patience and willingness to explain technical matters in a way that non-specialists could understand. It was clear throughout that the focus was on objective, evidence-led analysis rather than simply telling a client what they wanted to hear. A highly professional consultancy and one I would most happily recommend. Simon Lewis : Secretary : Nant-Y-Calch Conservation Group
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Earth Science Partnership has helped us immensely through a , long, stressful and complex situation following a major leak under our property. We had the absolute pleasure of working with Giles Sommerwill, who was with us every step of the way. He helped us to understand the geological conditions and ramifications following such a major leak, and then informed and advised us during the process of agreeing a remedial solution with the water company, as well as helping us address other issues that arose over time. Giles is experienced, knowledgeable and highly qualified. We could not have hoped to work with anyone more professional, reliable or kind. We also felt that Giles was genuinely concerned, not just about our property, but about our well-being. Thanks to him, we highly recommend, and praise, Earth Science Partnership.
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Having used the services of Earth Science Partnership on two previous occasions, we had no reservations about employing them for a third time. They are very professional and produce excellent detailed reports on what they are able to do. They are prepared to listen to everything you require and would highly recommend them.
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ESP undertook some thorough CMRA (Coal Mining Risk Assessment) works for our site. They showed a surprising level of knowledge into the historical mining methods and establishment of mining sites. Prompt and in-depth reporting and great communication, would definitely recommend.
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ESP have done some excellent GI works for me and produced some excellent in depth reports for our client (Network Rail)

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