Whilst the
average daily discharge limit was exceeded on two consecutive days under high rainfall conditions, the
Company identified and eliminated stormwater discharges to the system in a timely fashion. Additional
operational changes were made to minimise daily discharge volumes. The wastewater treatment system at
the Retreat did not adversely affect the water quality of the local freshwater and coastal environments. The
results of this sampling suggested that the Retreat was not influencing
predictions are made at the scale of the overall lake.
Uncertainty is a component of any freshwater monitoring or modelling. For example, river flows and levels
fluctuate throughout the day, and nutrient levels will vary depending on how much rainfall and runoff is
occurring. Pathogens and algae will grow in response to a range of factors, such as temperature, light and
river flow. This uncertainty is described in terms of ‘confidence’. For example, how certain it is that water
quality is
generally rely on rainfall events to provide adequate water,
at flows between 20 and 70m3/s, and the Scheme has been operating for many years.1
The location of a weir on a river used for kayaking would normally be identified as a hazard. A sign
upstream of the weir warning kayakers of its
stormwater upgrades at the site have included an additional sediment settling pond being added to
the stormwater system (Photo 4). This discharges to the stream via a new pipe (STW002101) into the same
manhole as STW002016. The original connection from the skimmer pits (STW002016) has been retained so
that during times of high rainfall the flow can come directly from the skimmer pits rather than flushing out
the sediment settling pond.
Sampling of the discharge from the Kaimiro Production Station
May 2018.
MacLeod/Hooker
Matters Arising
The impacts of recent extreme rainfall in the Gisborne region and the discharge of
forestry slash to rivers was raised and a discussion held over the likelihood of this
being an issue for Taranaki and how this could be managed under the NES –
Production Forestry. Concerns had been previously expressed by Cr Boyde about
similar incidents in Stratford District.
2. Update on submissions to the Proposed Coastal Plan for Taranaki
some low lying areas, and this was likely to have been
caused by the heavy rainfall that had been occurring since May 2015. Some ponding
was still evident, however there was no ponding present in the areas that were known
to have been used for the discharge of green waste.
There appeared to have been no activity at the disposal site since the last inspection
carried out in June 2015, possibly due to access issues through the wet low lying areas.
The Company was advised that the inspecting
indicator of the possible presence of faecal material
and pathological micro-organisms. Usually expressed as the number of
colonies per 100 ml
fresh elevated flow in a stream, such as after heavy rainfall
g/m3 grammes per cubic metre, and equivalent to milligrammes per litre
(mg/L). In water, this is also equivalent to parts per million (ppm), but
the same does not apply to gaseous mixtures
IR Unauthorised Incident Register – contains a list of events recorded by the
Council on
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 or potential environmental consequences or may involve non-
compliance with a consent or rule in a regional plan.
Tawhiti catchment consent monitoring report - Taranaki Regional Council.
Greymouth Petroleum Turangi B consent monitoring report - Taranaki Regional Council.