the excavation of soil in order to access the cables. It is anticipated that these events would be highly localised, temporary and of short duration. Jointing pits will be located be located away from watercourses and adjacent to field boundaries (avoiding rootzone) or roads and appropriate off-road vehicles would be used to access each of these. .
97.
In the event of a cable failure, it may be necessary to re-excavate the cable trench and replace / repair the faulty cable along limited stretches. If repair works are required, the mitigation measures outlined for the construction phase activities in section 19.6.1 would be adhered to, in order to reduce or minimise any potential impacts to an acceptable level.
98.
It is likely that machinery would be used and would require potentially polluting materials for their operation and maintenance to be stored and used on the converter station locations during its operation (e.g. fuel and oil). Therefore, there is a risk that leaks and spills could result in pollution of the soil and superficial deposits and groundwater. However, the frequency and duration of such activities is likely to be minimal, the quantities of fuel and oils used would be small and the impacts unlikely to be sufficient to cause significant deterioration in the quality value of the soil, superficial deposits and groundwater (lowmagnitude). Taking these factors into account, the significance of the impact is considered to be minor adverse.
99. Mitigation measures in relation to general maintenance activities, including the provision of appropriate welfare facilities at the converter stations are detailed below in Table 19.18.
Table 19.18Mitigation measures Mitigation measures At the converter stations, where it is not possible to store potentially contaminative materials off-site, arrangements would be made for storage in secure, bunded areas above ground level;
A Pollution Prevention Plan and Emergency/Incident Response Plan would be incorporated as part of a Code of Construction Practice for East Anglia THREE, and agreed with the local planning authority prior to construction;
Procedures would be put in place for identifying and reporting spillages or leakages either at the converter stations or during maintenance activities along the cable routes, and consideration given to the storage of containment equipment (e.g. absorbent matting, plastic sheeting etc.) on site etc.;
Gas risks would be considered for all maintenance workers whenever there is a requirement to enter confined spaces. This should be managed through contractor health and safety risk assessments;
The integrity of hardstanding at the converter stations and the drainage network would be inspected regularly to ensure that damage to either do not result in the creation of a potential pathway by which contaminants could either enter groundwater or surface waters; and
Preliminary Environmental Information May 2014
Oil, water and silt separators will be used where applicable on construction compound East Anglia THREE Offshore Windfarm
Chapter 19 Soils, Geology and Ground Condition Page 41
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