(machinery on site leading to spills and leaks of oils and fuels) are likely to result in localised, short term impacts, the magnitude of any potential impact is considered to be medium to low. On this basis, the impact significance is considered to be minor. Mitigation measures (including checking and maintaining equipment to ensure leaks and spills do not occur and having spill kits available at all times) in addition to site workers adhering to CoCP will reduce this further to a negligible significance.


19.6.1.2.1 Landfall, Onshore Cable Route and Converter Station.


Scenario 1: Pre-installed ducts 83.


Under Scenario 1, the amount of soil excavated would be limited to the jointing pits. Due to a small volume of soil excavated by this activity and the short term nature of the works the magnitude of the impact is considered to be low. Therefore, the impact significance is considered to beminor adverse. No further mitigation measures are recommended.


Scenario 2: Trenching and installing ducts 84.


Under Scenario 2, soils would be impacted during the excavation of the cable trench across the entire length of the onshore cable route, to a maximum depth of 1.5m. Following cable installation, soils would be immediately re-instated if deemed to be suitable. Soils affected by contamination would be disposed of appropriately. Although the risk of impact will cover a much larger area than that considered in Scenario 1, the actual volume and extent of spill impact is considered to be limited with adherence to embedded mitigation and the CoCP (Appendix 5.1). The impact from spills and leaks is considered to be of low magnitude, resulting in a generally minor adverse impact.


19.6.1.3 Impact 3: Impact on Ground Condition and Human Health 85.


The majority of the onshore cable route passes through agricultural land which is considered to represent a low risk to the health and safety of construction workers. However, a number of potential sources of contamination have been identified within the study area as detailed in section 19.5.


19.6.1.3.1 Landfall, Onshore Cable Route and Converter Station


Scenario 1: Pre-installed ducts 86. Where cables are to be installed in ducting, contact with soils would be limited and construction workers would not be working in direct contact with soils in areas of potential contamination. In addition, the siting of jointing pits for cable pulling operations will where possible avoid any potential sources of contamination. As


Preliminary Environmental Information May 2014


East Anglia THREE Offshore Windfarm


Chapter 19 Soils, Geology and Ground Condition Page 38


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