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
Executive, Audit & Risk Committee agenda December 2020
Remediation hearing - submitters' expert evidence - Ngāti Mutunga (Kathryn Jane McArthur)
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
Tawhiti Catchment consent monitoring report 2016-2017.
sampled, it was clear and slightly turbid
with slight foaming visible in the stream. No sheen or odour was apparent.
18 March 2016
A total of 65.5 mm rainfall had been recorded in the previous week at NPWWTP,
58 mm of which fell during the day prior to the inspection. This had rapidly filled the
site's stormwater ponds. While the water was being tested by DAS on the afternoon of
the 17th March, permission was sought and given by the Council to allow the ponds to
overflow to the
Greymouth Petroleum Kaimiro production station consent monitoring report - Taranaki Regional Council.
pH pH 6.7 6.5 6.4 6.4 6.5 - 8.5
Suspended solids g/m3 28 4 30 5 100
Turbidity NTU 16 - 4.8 - -
page
15
2.1.3 Results of consent holder monitoring
2.1.3.1 Stormwater monitoring by SENZL
SENZL monitors the combined stormwater discharge from the site, with sampling
triggered by rainfall events. Table 3 shows the results obtained during the 2015-2016
monitoring year. Hydrocarbons, suspended solids and chloride levels were all below
the limits set by consents