combination of native and indigenous forestry, with the
afforestation plan for the entire parcel attached to Mr Gibson’s evidence.
34. The Haehanga enters the Mimitangiatua about 780 m downstream of the
site office and about 100 m downstream of SH3/Mokau Road.
35. A key feature of the existing site is the drainage that has been put in place
to ensure clean water running off the hills in rainfall events is diverted
around the active site areas.
36. The wider catchment of the
organic material
such as poultry waste. This is then composted in one very large pile which is turned to stimulate the
composting process in the initial phase.
Any rainfall runoff and leachate that is generated, drains into a series of ponds for treatment referred to as
the pond treatment system (PTS). Between each pond is a baffle that skims off any floating hydrocarbons as
the leachate passes through. These ponds also treat the leachate and stormwater from pad 1 where
greenwaste and sheep …
we’re able to make predictions about the water quality
at any given location based on a range of environmental
characteristics that are common to those catchments where
monitoring data is available. These characteristics include
the geology, land cover, elevation, rainfall and the number
of farmed animals.
To refine these models and improve our understanding
of the actions we can take, we need to assess whether
contaminants are the result of human activities or
the tributary (WIT000460) exceeded the historical maximum count for that site. High
counts such as these are typically associated with heavy rainfall and the resultant
increase in agricultural runoff. However, the lack of precipitation prior to sampling
page
14
indicates that rainfall was not a significant factor in these results. As the counts were
high at sampling sites upstream of the septic tank and sewage pump station it is
unlikely that these results would be due
effects. Ring drains and bunds
were clear and fit for purpose. Everything was satisfactory.
23 May 2013
Inspection was undertaken following significant rainfall in previous days. The skimmer
pit contained discoloured water as a result of run-off from construction activities at the
site. There were no visual effects from this discharge on the receiving waters. The ring
drain near the generation unit had a section of damaged plastic liner. The newly
constructed ring drain on the eastern boundary
Council.
The neighbourhood was surveyed for environmental effects.
1.4.4 Chemical sampling
Sampling of the Sidewinder Production Station discharge and the Piakau Stream upstream and downstream
of the discharge was scheduled to be carried out on two occasions, however these samples were unable to
be collected during 2021-2022 (this was due to a combination of factors such as COVID measures, the
skimmer pits requiring a large amount of rainfall to discharge, and the site being manned only during
Ordinary Council Agenda February 2024 Part 1
November 2022 and 1 March 2023) are presented
in Table 3, along with a summary of the historical data. Ammoniacal nitrogen results can fluctuate due to
factors like recent grazing, topography of the surrounding area and/or leachate generation from additional
stormwater infiltration. Since 2017 ammoniacal nitrogen has been consistently below 10 g/m3-N. Figure 3
shows ammoniacal nitrogen results since 2005. Some of the higher results (e.g. 2015), can be attributed to
heavy rainfall preceding
Mangati catchment consent monitoring report - Taranaki Regional Council.
and this water was very clean. No flaring was being undertaken
at time of inspection and the bunds were all effective. It was discussed with the site
manager that some realignment or installation of skimmer pits at northern end of the
ring drain may be necessary to improve site drainage.
23 August 2012
The site inspection was carried out after a period of prolonged rainfall although at
the time of inspection it was fine. The site was neat, tidy and well managed. The
skimmer pits were full