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
bunded to contain any stormwater and organic leachate, and exclusion drains, bunds,
and diversions are situated around the ponds to divert clean stormwater away from
operational areas.
74. Stormwater runoff typically occurs immediately following rain events. The stormwater
volume depends on a number of factors, including the moisture content of the soil and
the intensity of the rain. The majority of contaminants contained within the stormwater
will be in the ‘first flush’ of water leaving
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
page
2 …
In terms of E. coli, bacteriological water quality in the latest survey period was similar in comparison with
historical surveys. The total number of samples falling within the “Alert” or “Action” categories (31% of
samples, or 35% if the samples of the Waimoku are included) across the 16 recognised bathing sites was
slightly higher than the recorded long-term average. However, it should be noted that the “Action” category
is the only category for which swimming is not recommended. In the
included in this memorandum has been
prepared in accordance with generally accepted accounting practice.
26. Design costs of $5,215.25 (incl GST) have been absorbed into the existing TEMO budget.
27. Printing costs will need to be considered for the adopted Group Plan and the number of physical
copies to print. This is likely to fall into the financial year 2025/26.
Civil Defence Emergency Management - Joint Committee - Draft Taranaki Civil Defence Emergency Management Group Plan