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BOC Immingham Dissolved Acetylene Project Environmental Statement: Vol. 2 Main Text Mitigation Measures Construction 8.60 With appropriate good working practices and the production and implementation of the CEMP, it is expected that there will be no significant water quality impacts during the construction phase of the development. Therefore no specific mitigation measures are considered to be necessary. Operation 8.61 Operational discharges will be controlled as a result of the Project design (e.g. through the requirements of BAT and appropriate drainage design), the implementation of good practice and regulation, monitoring and control measures (e.g. through the EP and the EMS). On this basis, the Dissolved Acetylene Project is expected to have a neutral impact on Middle Drain and the Humber Estuary and specific additional mitigation measures are not proposed. Residual Impact Assessment 8.62 Since no mitigation measures are proposed in relation to impacts associated water quality the significance of impacts does not change from that described above. Recommendations 8.63 The CEMP should include a method statement detailing the proposed techniques for ensuring that the water quality of Middle Drain and the Humber Estuary will be protected. It is recommended that this is submitted and agreed with NELC prior to commencement of development. Summary 8.64 This Chapter has assessed the potential for the Dissolved Acetylene Project to affect surface water features. Potential impacts to groundwater are considered in Chapter 7. The effect of potential changes in water quality on ecological receptors is considered in Chapter 10. Cumulative impacts and potential combinations of various effects due to other planned developments are discussed separately in Chapter 16. 8.65 The most significant surface water feature is the Humber Estuary. Middle Drain forms the north western boundary of the proposed development site. There are no public foul or surface water sewers in the area. There are no permanent surface water features on the development area itself. The land surrounding the development site is drained by a network of field drains which ultimately flow into the Humber Estuary; there is no hydraulic connectivity between the development area and these drains. An assessment of baseline conditions concluded that in relation to water quality the Middle Drain is considered to be of medium sensitivity and the Humber Estuary to be of very high sensitivity. 8.66 A number of potential impacts on water quality were identified for both the construction and operational phases of the development. Construction impacts will be controlled through the application of good practice and the development and implementation of a CEMP. 8.67 The aqueous discharges that will arise from the operation of the site will be effectively the same as those current discharged to Middle Drain from the existing site, i.e. clean water from the OWSs (for the site drainage system and the compressors), treated domestic waste water, clean water from regenerating the dryers and hard salty water (from regenerating the water softener). The new aqueous discharges will also discharge to Middle Drain. All other waste water streams will be collected for offsite disposal. It is noted that the facility will need an EP to operate and that the site will operate in accordance with an EMS, accredited to ISO 14001. 5100935.404 Environmental Statement August 2011 126
BOC Immingham Dissolved Acetylene Project Environmental Statement: Vol. 2 Main Text 8.68 Based on this impacts from construction were assessed to be of minor or neutral significance and operational impacts were assessed as neutral significance. Overall the Dissolved Acetylene Project is not considered likely to result in significant adverse effect on the water quality of Middle Drain and or the Humber Estuary and specific mitigation measures have not been proposed. 5100935.404 Environmental Statement August 2011 127
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