22.6.1.3.2Converter station 121. At the converter stations site any existing field drainage would be permanently altered as the land would be taken out of use during the operation of the project; this is discussed further in section 22.6.3.
22.6.1.4 Impact 4: Impacts to soils
22.6.1.4.1 Landfall and onshore cable route 122. Soils would be impacted by excavation of the cable trench across the entire length of the onshore cable route, to a maximum depth of 1.5m. Impacts to soil include degradation and loss of the overall soil resource. Degradation of soil occurs through compaction and deterioration of soil structure. This can occur along haul routes or where heavy plant and materials are stored. Loss of the soil resource occurs through exposure to wind and water, and inadequate storage thus eroding the soil. Impacts to soil quality are considered within Chapter 19 Soils, Geology and Ground Conditions. Following cable installation, soils will be immediately reinstated, and thus the impact will be of short duration. Excess spoil will be removed to a suitably licenced facility. The CoCP will include a protocol for removing and storing topsoil and excavated materials, and appropriate reinstatement (see section 22.3.3). No soils of significant environmental value were identified within the landfall and onshore cable route and therefore the sensitivity of the receptor is considered to be low.
Scenario 1: Pre-installed ducts 123. Under Scenario 1, the amount of spoil generated would be limited to the jointing pits. Due to a small volume of spoil generated by the activity (approximately 38,888 m3, with approximately 576m3 residual for offsite disposal), the magnitude of the impact is considered to be low. Therefore the impact significance is considered to be negligible. No further mitigation measures are recommended.
Scenario 2: Trenching and installing ducts 124. Spoil will be produced at the HDD locations, as well during excavation of the cable trenches and jointing pits where trenching occurs along 32.17km of the full 37km onshore cable route. This would create a large volume of spoil (approximately 188,986m3) the majority of which will be reinstated (with approximately 40,580m3 residual for offsite disposal), the magnitude of the impact is considered to be medium. Therefore the impact significance is considered to be minor adverse. No further mitigation measures are recommended.
Preliminary Environmental Information May 2014
East Anglia THREE Offshore Windfarm
Chapter 22 Land Use Page 40
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