19.5.1.5 Mineral Extraction and Quarrying 56.
Localised quarrying of shallow superficial sand and gravel deposits is evident in within the study area, although no sites were identified within the onshore electrical transmission works. Information collated by RSK indicate that six extraction sites are present within the study area as detailed in section 3.2.4 in Appendix 19.1 and the locations within 250m of the onshore electrical transmission works are summarised in Table 19.12 below.
Table 19.12 Summary of Mineral Extraction Sites Ref.*
Name Grid Ref
Approx. Distance to Onshore electrical transmission works
38 24
Blood Hill, Bramford
Lorraine Way, Bramford
6112, 2485 6123, 2482
200m northwest 25m south
Status
To be confirmed during consultation
*Site references 1 to 27 relate to RSK site reference numbers from Table T20-14. Site references 28 to 40 relate to sites referenced in the RSK report without reference numbers (RSK, East Anglia ONE Offshore Windfarm Environmental Statement, Volume 3, Chapter 20 Ground Conditions and Contamination, November 2012).
19.5.1.6 Ground Stability 57.
Envirocheck data (2011) provided to RSK (RSK 2013) indicated that there are localised areas, mainly around the converter station, that may be subject to ground stability issues, such as:
Collapsible and compressible ground in and around the area of the converter station;
Ground dissolution in the area of exposed chalk or where chalk is close to the ground surface around the area of the converter station; and
Landslide and running sands again around the area of the converter station. 58.
The sea cliffs at the landfall are subject to coastal erosion and slippage. Predicted cliff recession rates have been assessed by ABPmer (2012) and are discussed in more detail in Chapter 7 Marine Geology, Oceanography and Physical Processes.
19.5.2 Hydrogeology
19.5.2.1 Aquifer Designations 59.
Preliminary Environmental Information May 2014
The majority of the superficial drift deposits in the region are defined by the Environment Agency as Secondary A aquifers. These are described as deposits with
East Anglia THREE Offshore Windfarm
Chapter 19 Soils, Geology and Ground Condition Page 26
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