work so that the appropriate methodology could be
developed and then be undertaken during the next dry weather construction season. It was agreed that this
could be delayed to prioritise working on the Stage 3 cap following the landfill closure to municipal waste
(August 2019) on the basis that this would minimise the potential discharge of contaminants from the site as a
whole. The due date on the abatement notice was extended to March 2021.
Groundwater and under liner drainage sampling …
Appendix 1 56
Appendix 2 57
Appendix 3. El Niño/Southern Oscillation (ENSO) and Interdecadal Pacific
Oscillation (IPO) 60
Appendix 4: Catalogue of tornado and waterspout events reported in Taranaki
and offshore area 62
References for Appendix 4 74
Appendix 5 Selected severe weather indices for recent Taranaki and other
notable New Zealand tornadoes. 75
Appendix 6: Thresholds for CAPE, SRH, and EHI used in severe weather
forecasting. 77
Reviewed by: Approved
RTC Agenda December 2023 Web
avoid or minimise flooding of surrounding land to a
maximum level of 198.7 m asl, and a minimum level of 194 m asl except during periods
of maintenance;
• The discharge of water from Lake Ratapiko (during adverse weather conditions) via
spillways to the Mako Stream; and
• The discharge of up to 8 m3/s of water to the Makara Stream via a tailrace from the
Motukawa Power Station.
Further detail on each of these key components, and the operating conditions proposed by
Trustpower, is
Ravensdown site which was found to be non-
compliant in regard to ammoniacal nitrogen.
The light organic solvent preservative (LOSP) chemical Propiconazole was detected in the Mangaone Stream
downstream of Taranaki Sawmills Ltd during a wet weather survey. The levels were found to be well within
the empirical NOECs (no observable effect concentrations) for aquatic life developed by the European
Chemical Agency and the Cawthron Institute.
Monitoring of groundwater and leachate in relation to …
Meteorological conditions
26 Weather conditions, in particular wind speed and direction and atmospheric
stability, can influence the dispersion of contaminant emissions and their
potential to impact on air quality.
27 Weather conditions are measured nearby at the New Plymouth AWS
weather station at New Plymouth Airport, 1.9 km to the north-northeast of
the site. Given the proximity of this weather station, it should provide a
reasonable indication of overlying wind flows in the
page
254TARANAKI AS ONE—Taranaki Tāngata Tū Tahi
Weather-related hazards
Taranaki typically experiences moderate weather, but sitting out on the west coast of
New Zealand, the region’s exposed position means there can be some extremes.
Taranaki’s west coast is exposed to weather systems moving east from the Tasman Sea and to powerful wave
and wind conditions that cause erosion that has resulted in a coastline of cliffs. The mainly sunny, windy
climate usually provides
the discharge on
two occasions during the monitoring year under review.
Results of the survey performed on 3 November 2021 are presented in Table 4. On this occasion the stream
was running at a moderate steady flow, turbid and green brown in colour. The ponds’ treated wastewater
discharge was estimated at about 1.5 L/s and light tannin brown in colour with no noticeable odour. The
weather was dry with scattered cloud at the time of sampling. The wastewater discharge from the wetland
g/m2/30 days tend
to lead to complaints by neighbours over the objectionable or offensive nature of dust emissions from
particular sources.
Many industries emit dust from various sources during operational periods. In order to assess the effects of
the emitted dust, industries have been monitored using deposition gauges. From past results of deposition
gauging it is likely that factors including seasonal weather variations, vehicle traffic about the site and the
type of work being conducted