B-5 – Area 5 - Assessment of Environmental Effects 187 circumstances, there is no requirement to refer back to Part 2 of the RMA in determining a resource consent application unless there is invalidity, incomplete coverage or uncertainty of meaning within the statutory planning documents. However, for completeness and in accordance with Schedule 4(2)(1)(f) of the RMA, Part 2 of the RMA is considered in Section 9.4.10 of the Overarching AEE. 7.9 SECTION 105 OF THE RESOURCE MANAGEMENT ACT 1991 Section 105 of the RMA sets out additional matters which must be considered by a consent authority when considering an application for a discharge permit. Section 105(1) states: “If an application is for a discharge permit or coastal permit to do something that would contravene section 15 or section 15B, the consent authority must, in addition to the matters in section 104(1), have regard to— (a) the nature of the discharge and the sensitivity of the receiving environment to adverse effects; and (b) the applicant's reasons for the proposed choice; and (c) any possible alternative methods of discharge, including discharge into any other receiving environment. All of the relevant matters set out in section 105(1) of the RMA are addressed in this AEE and are summarised in Table 11 below. In particular, the nature of all discharges to the environment are detailed in Section 5 of this AEE, while the sensitivity of the receiving environments is discussed in Sections 2 and 5. However, it is concluded that the proposed discharges of contaminants to air, land and water associated with the proposal are the best practicable option for managing the activities within Area 5 and potential effects on the environment. Table 10: Consideration of Alternative Methods of Discharge. Discharge Receiving Environment Alternative Methods of Discharge Discharge of water to land within the sediment retention ponds and decanting earth bunds and to surface water via spillways. Refer to Section 2 The proposed use of sediment retention ponds is considered best practice construction methodology to reduce the potential for sediment runoff to land and into waterbodies. Sediment retention ponds are designed to allow spill into adjacent waterbodies when flows are sufficiently elevated to provide effective dilution of contaminants. The sediment retention ponds on site will be designed to accommodate a minimum storage volume ratio of at least 3% of the contributing
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