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 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
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
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
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
during the year (four relating to high
rainfall, and one relating to a potable water leak). All of these incidents were deemed compliant with
consent conditions upon further investigation. There were also 19 wastewater incidents that occurred
throughout the wider wastewater network; 12 of which were related to high rainfall that occurred in
November and December in 2020. One incident occurred when a contractor left a pipe plug in the sewer
following maintenance, which resulted in an overflow
............................................................................................................................. 10
APPENDIX A MONITORING WELLS- REMEDIATION NEW ZEALAND- URUTI .......... 11
APPENDIX B MONITORING BORE INSTALLATION .................................................... 13
APPENDIX C SOIL MOISTURE AND RAINFALL RECHARGE ON CHLORIDE
CONCENTRATIONS IN GROUNDWATER ............................................. 15
APPENDIX D PRELIMINARY UNCONFIRMED CONCEPTUAL SITE MODEL ............... 1
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Commercial in confidence
TABLES
Table 2.1:Haehanga Catchment
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
silty-clay
. Due to high rates of irrigation loading, shallow 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