Our input comprised phase 1 desk study (preliminary sources study) of the individual sites and geotechnical investigation to obtain the engineering characterisitcs and properties of the shallow soils, along with assessment of potential risks posed by contamination.
The investigations generally comprised hand excavated inspection trial holes, the measurement of in-situ CBR values (using DCP equipment), and the collection of cores through the existing highway.
The town centre location of the sites posed significant restraints on the geotechnical investigation, including risks from vehicular traffic and a dense network of underground utility services. The proximity of the works to members of the public and related risks required the adoption of extensive health and safety measures. We identified variable ground conditions across the sites including geotechnical risks posed by potentially compressible strata and extensive underground services. Furthermore, the sites were identified as being highly sensitive to pollution, being located on a Principal Aquifer and within an aquifer Source Protection Zone.
Factual and interpretive reports completed by our geotechnical engineers were in accordance with HD22-08 (Highways Agency, 2008).
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