identified as black loamy sand
and vegetation growth consists mostly of pasture. Test pitting and the logging of
boreholes on site indicated a relatively shallow water table. Test bores were augured to
10 m both around the wastes holding pit area and to the south-western site boundary,
revealing alternating layers of sand and clays. Bore construction also revealed localised
peat layers within some augured cores (approximately 4–8 m below surface). Average
annual rainfall for the site is 1,043 mm
processed, compressed and piped to end
users. The produced water is disposed of by deep well injection.
Stormwater from the production station is collected and discharged at three separate points. The water level
in the firewater pond in the north western corner of the site is maintained by an abstraction from the
Ngaere Stream. Overflow due to rainfall entering this pond is discharged to land and to the Ngaere Stream
to the north of the pond. Stormwater from the process areas is directed to a
Agenda for Regional Transport Committee June 2017.
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 1383mm (taken from nearby Motunui
monitoring station). There are no significant surface water bodies located in the
immediate vicinity of the areas that are landfarmed, other than small farm drains.
Previous land use at the Wellington section of the landfarm has been a mixture of
agricultural and
Trustpower Motukawa hydro scheme consent monitoring report - Taranaki Regional Council.
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 2021 (image provided by WRS)
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giving a free
available chlorine of <0.01 g/m3. The weir inlet screens were cleaned during the inspection and the inlet
chamber was emptied. The screens were being cleaned frequently and this was due to increase further with
an anticipated increase in rainfall over winter and spring. A significant amount of work has been proposed
to upgrade the water pipe that carries water from the river to the plant. This work is in the planning process
and will include a more accurate flow meter at the river. …
identified as
black loamy sand and vegetation growth consists mostly of pasture. Test pitting and the logging of
boreholes on site indicated a relatively shallow water table. Test bores were augured to 10 m both around
the waste holding pit area and to the south-western site boundary, revealing alternating layers of sand and
clays. Bore construction also revealed localised peat layers within some augured cores (approximately 4–8 m
below surface). Average annual rainfall for the site is 1,043 mm
Methanex Motunui and Waitara Valley Combined Annual Report 2022-2023
under review, upstream
minus downstream of the plant
2.1.4.2 Discharges to the Kahouri Stream
The Company recorded 24 occasions where stormwater was discharged to the Kahouri Stream during the
2021-2022 monitoring period. This occurred during high rainfall events. Stormwater monitoring is
undertaken by the Company.
2.2 Results of receiving environment monitoring
2.2.1 Inter-lab Comparisons
The results of the Council monitoring of the effluent from the TCC and SPP in the