B-2 – Area 2 - Assessment of Environmental Effects 82 Actual or Potential Effect Recommended Mitigation / Management Recommended Monitoring / Future Action Additional Measures Proposed by OGNZL Surface Water Impacts to water quality from runoff from the WUG portal, access roads, WRS haul road, and lower access roadside drains. To reduce potentially contaminated runoff, clean water diversion drains will be installed above these elements. Potentially contaminated runoff from these areas will be collected from the WRS haul road, WUG portal access road and lower access roadside drains and conveyed to the Main Collection Pond, where it will be pumped to the WTP for treatment. See Geochemistry section. None. Impacts to water quality from other developed areas (i.e. areas excluding the WRS, WUG Portal, access road and lower access road side drains). Stormwater runoff from developed areas (excluding areas going to the Main Collection Pond) will drain via pipes and swales to the SFA detention pond where practical. For these areas, swales will provide the primary source of water quality treatment for surface runoff, with extended detention at the SFA detention pond to provide some additional treatment. Elements of the SFA which are expected to be higher generators of contaminants will be assessed to provide additional and specific treatment methods where required, i.e. oily water separators at workshops, wheel wash catchpits. None. None. Impacts to water quality during the construction phase as a result of the discharge of sediment from earthworks during both rain events and streamworks. Prepare and adhere to a comprehensive Site-Specific Erosion and Sediment Control Plan, which is: Consistent with Waikato Regional Council Technical Report No. 2009/02 Erosion and Sediment Control Guidelines for Soil Disturbing Activities, January 2009 (TR2009/02); and Routine monitoring of erosion and sediment control measures to identify maintenance requirements. Routine monitoring of the discharge from sediment retention ponds and decanting earth bunds during None.
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