some deeply
buried seed may survive for up to 10 years or more. Seedlings can emerge from soil depths
6
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Yellow Bristle Grass Ute Guide Third Edition
of up to 10 cm, but optimal germination is at 1–2 cm depth. Counts have shown seed
numbers up to 20,000/m2 but typically 5–10,000/m2 under light infestations.
YBG occurs in areas with adequate summer rainfall, usually where the annual rainfall
exceeds 500 mm per annum, although it can tolerate dry conditions once
ANZCO Eltham (Riverlands) consent monitoring report 2017-2018
Taranaki Regional Council
Private Bag 713
Stratford
April 2010
#537059
page
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i
Executive summary
Taranaki has a very dense drainage network, the natural consequence of its frequent and
plentiful rainfall and of gravity’s effects upon water driving it downhill to the sea. Stream
flows become the habitat of freshwater ecology and gain value for their in-stream uses and
benefits. In Taranaki as in other parts of New Zealand, land clearance and associated
1987). The climate is generally
mild, with relatively high humidity and fairly high, evenly distributed annual rainfall .
Soils are volcanic and varied, and include deep ash soils, well-drained alluvial soils
along rivers, and sandy soils near the coast. Slopes within the broader landscape
around the potentially affected sites range from gently undulating to strongly
rolling. The Waiwhakaiho River is a narrow, single channel river, typically 10-m to
30-m wide, set within a
the Eltham municipal wastewater
treatment system (WWTP) located to the east of Eltham in the Mangawhero catchment. STDC
holds a resource consent to allow it to discharge treated wastewater to the Mangawhero
Stream under high rainfall conditions only. Previously STDC also held a consent for the
discharge of emissions into the air but this expired in mid 2011 when it was no longer
considered necessary as the nature of the biological processes at the plant met a ‘permitted’
category in the
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 (taken from the nearby
mobilised a cleanup crew, machinery and
equipment. Spill booms and hay bales were put in place to contain the spill and the
Oscar unit from the Port Taranaki storage site was also mobilised.
2.6 Mr Steele first noticed an irregularity with the unnamed tributary a week prior but
assumed it to be discolouration due to heavy rainfall until viewing it again on the
8th October.
2.7 The leak was notified to Ngati Ruanui Iwi, under the OENZ spill notification
procedure, at 4.10 pm on 8th October
stream.
The full survey reports are attached in Appendix II.
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11
2. Results
2.1 Water
2.1.1 Inspections
Seven inspections were undertaken at the Waihapa Production Station and associated
sites during the period under review. The following was found during the inspections:
23 July 2013
The site was inspected after recent rainfall and it was observed that ring drains and
bunds were all secure and clear of contaminants; however some wind-blown debris
rainfall for the site is 1,043 mm (taken
from the nearby ‘Patea’ monitoring station). As with the other South Taranaki coastal
sites, the Geary site is subject to strong winds.
Site data
Location
Word descriptor: Geary Road, Manutahi, Taranaki
Map reference: E 1718754
(NZTM) N 5606372
Mean annual rainfall: 1,043 mm
Mean annual soil temperature: ~15.1°C
Mean annual soil moisture: ~32.9%
Elevation: ~40 m
Geomorphic position: Cliffed coast / dune
Executive, Audit & Risk Committee agenda June 2020