Prevailing winds are generally north-easterlies
reflecting a disturbed westerly airflow, often to gale
force on ridge lines although this varies according to
topography, and westerly winds are more common
in the inland hill country. The many valleys are well
sheltered but ridges are very exposed, especially in
the south. Rainfall ranges up to 900 mm near the
Whanganui River, to more than 2300 mm along the
crest of the Matemateaonga Ranges.
With no coastal or mountain
reworked dune fields. The predominant soil type has been identified as
black loamy sand. Vegetation growth is primarily a mixture of pasture and dune
grasses. Prior to the Wellington property consents (7670-1, 7884-1) being exercised
there were areas of pine which have been subsequently removed and processed.
Average annual rainfall for the site is 1,383 mm (taken from nearby Motunui
monitoring station). There are no significant surface water bodies located in the
immediate vicinity of the
inspections were undertaken with a representative from Origin
Energy. The weather was fine at the time of the inspection, but followed a long period
of inclement weather consisting of strong winds and high rainfall.
The sites were generally observed to be neat and tidy. Stormwater systems were in
place on each site. It was agreed with Origin Energy that some checks needed to be
carried out during rainfall at the Rimu Production Station and Manutahi-C wellsite in
order to confirm the integrity of
doesn’t adversely affect groundwater and that high chloride
(and associated sodium) does not affect the soil structure and pasture regrowth and result in excessive leaching to
groundwater. In some later consents, for single applications of mud on sandy soil, restrictions on nitrogen and
chloride were dispensed with in favour of not permitting any increase of contaminant concentrations in surface or
groundwater except total dissolved salts, on the basis that high rainfall at these
Remediation hearing - submitters' expert evidence - Ngāti Mutunga (Kathryn Jane McArthur)
rainfall
preceding sampling.
Figure 3 Ammoniacal nitrogen concentration of the Inglewood landfill stormwater/leachate (RTP002005)
for monitoring to date
2.2.3 Results of receiving environment monitoring
Chemical analysis
Receiving water sampling was undertaken at sites AWY00103, AWY100105, AWY000100, AWY000107 and
AWY000115 on two occasions (23 November 2020 and 2 February 2021). The locations of these monitoring
sites are shown in Figure 2 and the results of the chemical
a relatively
shallow water table. Test bores were augured to 10 m in the pit area, revealing extensive compacted, low
permeable clays underlying coastal dune sands. Pit construction revealed mostly tightly packed sand at the
pit bases (approximately 4-5 m below surface). Average annual rainfall for the site is 1,023 mm (taken from
the nearby ‘Duffy’ monitoring station). As with the other South Taranaki coastal sites, this site is subject to
strong winds.
Photo 3 Landfarming area M2110
Waitaha catchment (Bell Block industrial) consent monitoring report
have included an additional sediment settling pond being added to
the stormwater system (Photo 4). This discharges to the stream via a new pipe (STW002101) into the same
manhole as STW002016. The original connection from the skimmer pits (STW002016) has been retained so
that during times of high rainfall the flow can come directly from the skimmer pits rather than flushing out
the sediment settling pond.
Sampling of the discharge from the Kaimiro Production Station was undertaken twice
the extent of historical filling in the area as shown in Figure 3. During the year under review,
monitoring showed that the levels of BOD, unionised ammonia and ammoniacal nitrogen were elevated in
relation to the landfill tributary, which may have been as a result to the high rainfall and agricultural
activities around the headwaters of the roadside tributary.
During the year under review, the water quality results from the Tawhiti Stream sites show that the inflow
from the roadside