westerly wind. The monthly rainfall was 210 mm of
rain as recorded at the Inglewood WWTP TRC weather station.
The step screen was operating and wastes were fully contained. Slight odour was noticeable in the vicinity of
the step screen. One aerator was operating on the aeration pond, which was a turbid, light grey brown
colour. The pond was discharging into the main pond.
The main pond had a normal level of 0.76 m, with a relatively clear, green grey colour and rippled surface.
The
organisms.
Southern Hill Country Freshwater Management Unit Discussion Document
annotation https://www.trc.govt.nz/ https://www.trc.govt.nz/
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Southern Hill Country Freshwater Management Unit Draft Discussion Document Page | 9
Two sites are monitored for ammonia. Both fall in band A, meaning ammonia is likely to have little to no
effect on all but the most sensitive species. Modelled estimates support monitoring results, with
approximately 82% of streams and
210.85 -
These records indicate that the treated effluent discharge into the Waiongana Stream was well managed on
all occasions with all discharging occurring when stream flow was above 5m3/s.
The Waiongana Stream hydrology displays a natural rapid rise and fall (typical of Taranaki ring plain
streams), which allows for a limited window of opportunity when treated wastewater can be discharged
above the minimum consent limit. The consent holder has access to the Council web site, which
overabundance of algae and aquatic weeds, impact on the
growth of sensitive species, or even become toxic to freshwater organisms.
For ammonia, modelling suggests that all streams fall in band A (92%) or band B (8%) (Figure 4). Ammonia
is expected to have little to no toxic effect on all but the most sensitive species.
For nitrate, around 12% of streams fall within band A and aquatic species are unlikely to experience the
effects of nitrate. The majority of streams fall into band B (88%) (Figure
sites are monitored for ammonia. Three
out of four sites fall within band A and one
site in band B. At these sites, ammonia is
likely to have little to no effect on all but the
most sensitive species. Modelled estimates
support the monitored results, with
approximately 68% in band A and 32% in
band B (Figure 4).
Four sites are monitored for nitrate, all of
which fall in band A. At these sites, nitrate is
likely to have little to no effect on aquatic
life. Modelled estimates largely
period was lower than normal in
comparison with historical surveys. The total number of samples falling within the “Alert” or “Action”
categories (40% of samples) across the 16 recognised bathing sites was the highest recorded. However, it
should be noted that the “Action” category is the only category for which swimming is not recommended.
In the 2017-2018 season, 79% of all samples met the national bathing guideline. Of the 21% of samples that
exceeded the guideline, 11% arose
overabundance of algae and aquatic weeds,
impact on the growth of sensitive species, or
even become toxic to freshwater organisms.
Five sites are monitored for ammonia, all of
which fall within band A. At these sites, ammonia
is not likely to have any toxic effect, even on the
most sensitive species. Modelling estimates
(Figure 4) however, suggest that around 66% of
rivers or streams are in band A, while 34% are in
band B.
Five sites are monitored for nitrate. One
undertaken on 20 February 2015 38
Table 10 Results of rain event monitoring – discharge and Puremu
Stream samples, 13 August 2014 39
Table 11 Results of rain event monitoring - Manganaha Stream, 13
August 2014 40
Table 12 Biomonitoring sites in the Puremu and Manganaha Streams
related to the Colson Road Landfill. 41
Table 13 Chemical analysis of Colson Road Landfill groundwater
sampled 9 June 2015 44
Table 14 Air deposition monitoring results for 13 January- 4 February
2015 45
River water quality
Nutrients
Ammonia, nitrate, and phosphorus are important for plant growth, but in excess amounts can cause
problems in freshwater. They can lead to an overabundance of algae and aquatic weeds, impact on the
growth of sensitive species, or even become toxic to freshwater organisms.
One site is monitored for ammonia, and falls in band A. At this site, ammonia is likely to have little to no
observed effect on ecosystem health. Modelled estimates supports the
ponds before land
application. The pond is stirred as effluent is sprayed onto pastures via a travelling rain gun.
There are two storage ponds on the property, pond 1 has a storage capacity of 24,500 m3, and pond 2 has a
storage capacity of 19,320 m3.
The existing piggery, ponds, and irrigation areas in relation to the property are shown in Figure 1, and Figure 2
Figure 1 Location of Stanley Bros Trust Piggeries current buildings and effluent ponds
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