rainfall events, or if animals have direct access to waterways. Human faecal
contamination of waterways can occur via poorly treated sewage or septic tank systems, or during heavy rain
when sewerage systems cannot cope and they overflow into stormwater systems. Because of these
heightened health risks from runoff and stormwater, people are often advised to avoid swimming for 48 hours
after prolonged or heavy rain.
There are two distinct components to assessing the suitability of a site for
diversion of wastes to the Hawera WWTP in the 2010-2011 period, discharges from the Eltham
WWTP now occur only as a result of high rainfall events that exceed the storage capacity of the primary and
holding ponds, and the pumping capacity of the reticulated system to Hawera.
Analysis of the primary pond effluent was not required during the monitoring period, although the
condition of the pond and any associated odour continues to be monitored during routine inspections.
Along with a visual
the abattoir in the 2014-15 period 5
Figure 3 Sites monitored for discharge or receiving environment water quality 15
Figure 4 Concentrations of total nitrogen and total phosphorus in the irrigated
wastewater. 17
Figure 5 Daily abstraction volume for the 2014-15 period, from the Kahouri Stream. 18
Figure 6 The irrigation areas, showing the cut and carry paddocks (green) and
regular paddocks (blue). 19
Figure 7 Flow in the Patea River at Skinner Rd and rainfall data (27 October 2014 to
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
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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
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
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