The Company operates Oeo landfarm, situated off South Road, Manaia, identified in
Figure 1. The consented site consists of two land parcels totalling 13.8 ha of available
spreading area. The site is located on privately owned marginal coastal land situated
on reworked dune fields. The predominant soil type has been identified as black loamy
sand, and vegetation growth is primarily a mixture of pasture and dune grasses.
Average annual rainfall for the site is 1,122 mm (taken from the nearby
energy brooks with silty beds, however with increased rainfall the
suspended solids level can rise quite quickly as silt is stirred up from the beds and
edges of the streams and is entrained in the flow. Overall the level of suspended solids
indicates good water quality in the stream system.
Apart from a slight comparative spike in conductivity levels in the results for June 2008
in the downstream sites, the overall levels are quite stable. All but three results are in
the 18-25 mS/m range
indicator of the possible presence of faecal material
and pathological micro-organisms. Usually expressed as colony forming
units per 100 millilitre sample
fresh elevated flow in a stream, such as after heavy rainfall
g/m3 grams per cubic metre, and equivalent to milligrams per litre (mg/L). In
water, this is also equivalent to parts per million (ppm), but the same
does not apply to gaseous mixtures
Incident an event that is alleged or is found to have occurred that may have
actual
evident on the site and in some places within the ring drains. The majority of
ring drains were vegetated with grasses that helped with controlling and treating sediment laden
stormwater. Other sediment controls were in place within the ring drains such as rock weirs and silt fences.
Hydrocarbon sheens were not observed within the skimmer pits or in puddles on any of the sites. The
skimmer pits were all in good order with goose neck pipes functioning as required. Following heavy rainfall
the
Freshwater physicochemical monitoring state of the enviornment report 2017-2018
Waitaha catchment consent monitoring report - Taranaki Regional Council.
below surface). Average annual rainfall for the site is 1,043 mm (taken from the nearby Patea monitoring
station).
Origin Energy Ltd’s Kauri D wellsite is situated in the eastern corner of the site, and there is a small coastal
lake inland and to the northeast (up gradient) of the storage pit area. Both of these features are presented
in Figure 1.
Figure 1 WRS Waikaikai Landfarm and regional insert
page
6
A summary of the site data is provided below:
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 large separator system to the
north east of the site. The effluent from this separator is discharged to a small unnamed tributary to the east
which joins the Ngaere Stream approximately 40 metres above its confluence with the Patea River.
Stormwater from other areas is
TRC Annual Report 2017/2018 - community outcomes
animals is the predominant land use in Taranaki. Associated
with that land use is the discharge of animal excreta onto land with associated faecal
microorganisms, which can end up in waterways through overland flow during rainfall
events. These microorganisms can affect human health and animal health if ingested and
impact the instream values of waterways.
In Taranaki, and in other parts of New Zealand, there has been significant investment in
recent times by the farming sector in adopting a