produced water is disposed of by deep well injection.
Stormwater from the production station is collected and discharged at three separate points. The water level
in the firewater pond in the north western corner of the site is maintained by an abstraction from the
Ngaere Stream. Overflow due to rainfall entering this pond is discharged to land and to the Ngaere Stream
to the north of the pond. Stormwater from the process areas is directed to a large API separator system to
the north east of
nitrogen concentration in the pond and the rainfall 30 days prior to the
sampling event. This was based on 7 ammoniacal nitrogen concentrations
measured between October 2017 and April 2019. The relationship has an
R2 value of 74%.
Using this relationship, the monthly rainfall from 2018 was used to
calculate monthly nitrogen concentrations in the pond. The concentration
was converted to a loading rate in kg/ha/month based on the volume
irrigated (calculated from 2018 irrigation hours and an
REMEDIATION NZ LTD Page 7
Document No: RU-P-650-0500-A
Revision No: V1.3
Date: 1 0-9-2018
Controller: C Kay
page
Leachate & Stormwater
Management Plan
f) Any conspicuous change in the colour visual clarity;
g) Any emissions of objectionable odour;
h) The rendering of fresh water unsuitable for consumption by farm animals; and
i) Any significant adverse effects on aquatic life.
3.4.3 Climate
NIWA virtual Climate Station -38.975, 174.525 Thirty years of rainfall and
climate, with abundant rainfall and high sunshine hours, makes the region lush, green
and fertile.
Rainfall
Annual rainfall varies throughout the region. Some coastal areas receive less than 1,400 mm annually, while
the summit of Mount Taranaki receives around 7,500 mm.
Heavy rainfall events do occur and there can be extremes. In 2012 heavy rain caused a number of slips on
the coastal road around Mount Taranaki, including a large slip at Oākura that covered the road, burying a
industries 2021-2022 compliance monitoring sampling sites
The first of two dedicated stormwater sampling surveys scheduled for 2021-2022 was carried out between
07:30 and 11:00 on 30 November 2021. The survey was preceded by moderate rainfall overnight (23.2 mm)
recorded between 02:00 and 07:00 at Brooklands Zoo rain gauge. Light rain fell intermittently from the
morning to the early afternoon. There had been very little rainfall for 12 days preceding this survey. Samples
collected were also
simulation model, developed by CSIRO,
Australia. The value of pasture ($/kg-DM) was estimated using local farm parameters
that were developed in consultation with Louise Hofmann, Taranaki FarmWise
consultant. The results of that work showed that the values of pasture in the area range
between $0.17 to $0.25/kg-DM, with an average value of $0.22/kg-DM.
Based on these values the irrigation marginal benefits were calculated for a range of
rainfall and soil combinations for three values of pasture:
Figure 2 Daily hours where DO is greater than 0 g/m3 in Pond 1 and 2 9
Figure 3 Daily discharge volumes (m3/day) from the HWWTP and daily rainfall data (mm) from a
Council rainfall station located approximately 5 km east of the site (2020-2021) 13
Figure 4 Location of intertidal survey sites in relation to the outfall 14
Figure 5 Mean number of species per quadrat for spring surveys (1992-2020) 15
Figure 6 Mean Shannon-Weiner indices per quadrat for spring surveys (1992-2020) 15
groundwater beneath the Uruti Composting
Facility Site are moderately impacted with Chloride contamination
Site layout, hydrogeological interactions, soil types and rainfall also influence the level of
Chlorides observed in the soil, groundwater resources and the Haehanga Stream
environment
Offsite impacts have not been quantified and where not part of the scope of this report
The Uruti Composting Facility Management Plan was developed to improve the performance of the
composting
monitoring year, with most
commencing irrigation in November or December and concluding in February. Rainfall recorded at the
Council’s monitoring locations over the summer irrigation period ranged between 55 % and 111% of
historical mean values. A particularly dry November and December lead to a drought being declared in
Taranaki during 23 December 2017. As a result, irrigation water demand was high during the 2017-2018
irrigation season, with a total water use across all exercised irrigation
Figure 40 Average rainfall data for Taranaki, November 2018 to April 2019 49
Figure 41 Box and whisker plots of enterococci and specific conductivity at all sites during the 2018-
2019 season (SEM data only) 52
List of photos
Photo 1 Onaero Beach 11
Photo 2 Waitara East Beach 14
Photo 3 Waitara West Beach 17
Photo 4 Fitzroy Beach 20
page
vi
Photo 5 East End Beach 23
Photo 6 Ngamotu Beach 26
Photo 7 Back Beach 29
Photo 8 Oakura