due to low inflow volumes and evaporation.
A recirculation system was installed during the 2018-2019 year to further limit discharges, while 5,000 L
tanks were utilised during 2019-2020 to store excess volumes when rainfall exceeded capacity of the ponds
and the recirculation system.
During the 2019-2020 year, there was a reduction in the use of the Fire Training Centre and the recirculation
system. Additional tanks contained all wastewater so that there were no further discharges from
under review, upstream
minus downstream of the plant
2.1.4.2 Discharges to the Kahouri Stream
The Company recorded 24 occasions where stormwater was discharged to the Kahouri Stream during the
2021-2022 monitoring period. This occurred during high rainfall events. Stormwater monitoring is
undertaken by the Company.
2.2 Results of receiving environment monitoring
2.2.1 Inter-lab Comparisons
The results of the Council monitoring of the effluent from the TCC and SPP in the
Stanley Bros Trust Piggery Annual Report 2020-2021
shallow water table. Test bores were augured to 10 m in the pit area, revealing extensive compacted, low
permeable clays underlying coastal dune sands. Pit construction revealed mostly tightly packed sand at the
pit bases (approximately 4-5 m below surface). Average annual rainfall for the site is 1,023 mm (taken from
the nearby ‘Duffy’ monitoring station). As with the other South Taranaki coastal sites, this site is subject to
strong winds.
Figure 1 WRS Symes Manawapou Landfarm extent and …
aluminium
shear and discussions were had with staff regarding minimising tracking to a nearby stormwater sump.
7 Jun 2019
The inspection was carried out after sustained heavy rainfall earlier in the day. The site was operational with
casting and powder-coating underway. Small amounts of swarf were noted in the scrap loading yard and
some of this had collected on the filter screens installed in the stormwater sumps. Minor ponding was
observed in low-lying areas of the yard as a result of the
Executive, Audit & Risk Committee agenda August 2020
rainfall events.
Table 4 shows the results obtained during the 2022-2023 monitoring year. In all samples pH, hydrocarbons,
page
10
and suspended solids levels were all within/below the limits set by consents 5997-1, 6269-1 and 10933-1,
and were indicative of a consistently clean discharge.
Table 4 Results of stormwater samples collected by OMV during the 2022-2023 year
Date
No.
pH Hydrocarbons
g/m3
Chloride
g/m3
Suspended solids
g/m3
Median Max
soil.
1.2.3 Site description
The Wellington Landfarm is located on Brown Road, Waitara, on marginal coastal farm land situated on
reworked dune fields. The predominant soil type has been identified as black loamy sand. Vegetation
growth is primarily a mixture of pasture and dune grasses. Prior to the Wellington property consent (7884-1)
being exercised, there were areas of pine (Figure 2) which were subsequently removed and processed.
Average annual rainfall for the site is 1,383 mm
compliance monitoring purposes.
Hector Place pumping station and the emergency overflow structure were also inspected and found to be in
a satisfactory condition.
12 February 2018
An inspection of the WWTP was conducted in fine weather with moderate north westerly wind conditions.
The monthly rainfall was measured as 68 mm, recorded at the Kapoaiaia weather station.
The influent step screen was operating and wastes were fully contained. The primary pond was a turbid,
dark green brown