logging of
boreholes on site indicated a relatively shallow water table. Test bores were augured to 10m both around
the waste holding pit area and to the south-western site boundary, revealing alternating layers of sand and
clays. Bore construction also revealed localised peat layers within some augured cores (approximately 4–8m
below surface). Average annual rainfall for the site is 1,186mm (long term average to 2023 taken from the
nearby Pātea at Bore 3 monitoring station).
Origin Energy
Committee of the intention to accelerate the removal of treated farm
dairy effluent discharges from waterways, in most cases. On the upper ring plain
land discharge may not be possible at all times and some discharge of highly
treated waste water may be required. A study on the options for dairy shed and
waste treatment systems in this high rainfall area is being investigated. The
requirement to discharge to land, in most cases, addresses cultural and water
quality concerns.
observed at the top of the weir. There were elevated
flows at the time of the inspection due to heavy rainfall previously.
The lamprey baffle was viewed during the inspection on 4 October 2023 as the flow in the river was lower than
the previous inspection. It was noted that no rocks had been installed above the lamprey baffle to further
reduce flow, but this was no longer needed as the required timeframe for lamprey passage (1st June to 30th
September) had passed. Tree debris was observed
contributing waterways drain off the high, steep, unstable slopes of
Mount Taranaki and are capable of transporting large amounts of coarse sediment as bed load, as
well as fine sediment (TRC, 2011). Additionally, the orographic influence of Mount Taranaki results in
high local rainfall and attracts high intensity rainfall events in the headwaters of rivers originating on
the Maunga. This means sediment transport rates, and the frequency of sediment transport events,
are likely to be relatively high in the
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page
Site Monitoring
Purchased YSI hand held Multi Meter & YSI Photometer
Sample monitoring bores, streams and ponds every week
Update the sampling graphs weekly
Download the rainfall data weekly
Walk the streams weekly ..,.. I'1!i'I ...-"'-
YSI 9300 and 9500 photometers... ~ USER M,\NUAI.
User Manual
page
Irrigation Pond ManagementIrrigation Model
Proactive management of the pond volume/level
Default
points (when allowed) the
Company is required to put out signs at predefined locations discussing limited access. At no point during
this monitoring period were lake levels below the usable range, therefore, any inability to use the ramp was
a result of maintenance issues. Boat ramp usability is discussed later in this report. During large rainfall
events the 78 m upper limit was briefly exceeded during this monitoring period. The Company is to
page
13
endeavor to ensure
application rates for Farm 1 56
Figure 47 Paddock annual nitrogen application rates for Farm 2 56
Figure 48 Paddock annual nitrogen application rates for Farm 3, fixed irrigator network 57
Figure 49 Paddock annual nitrogen application rates for Farm 3, travelling irrigators 57
Figure 50 Monthly mass of nitrogen irrigated 59
Figure 51 Monthly rainfall totals and median soil moistures 59
Figure 52 Estimated monthly mass of phosphorus irrigated 59
Figure 53 Total nitrogen
Low-elevation
Lake
GM
M
H
L
Lk
GM: M and % permanent ice > 1.5%
M: > 50% annual rainfall volume above 1000m ASL
H: 50% rainfall volume between 400 and 1000m ASL
L: 50% rainfall below 400 m ASL
Lk: Lake influence index2 > 0.033
Level 3 Geology Alluvium
Hard sedimentary
Soft sedimentary
Volcanic acidic
Volcanic basic
Plutonics
Miscellaneous
Al
HS
SS
VA
VB
P
M
Category = the spatially dominant geology
is owned by
the Company, and consists of steep eroded hillsides, multiple side gullies, and small river flats distributed
along its length. The area receives more rainfall than the northern Taranaki coastline to the south-west. Soils
are generally poor and highly erodible. Patches of bush and planted trees cover most of the hillsides, with
grasses over the remainder and the flats.
1.3 Process description
The Company’s operations include composting, quarrying and vermiculture operations
discharge of stormwater and
wastewater onto and into land and into an unnamed tributary of the Kahouri Stream.
During the monitoring period, Fletcher Concrete and Infrastructure Ltd (Fletcher Concrete) demonstrated
a good level of environmental performance and high level of administrative performance.
There was a breach of consent conditions identified from sampling undertaken during a heavy rainfall event.
Levels of total suspended solids exceeded those allowed for in condition 7.