2022
The routine inspection was undertaken to assess compliance monitoring. It was intended that sampling
would be undertaken with this inspection, however due to the rivers being in fresh the associated sampling
was not undertaken. The inspection was undertaken in wet weather conditions, with all streams in the
catchment including the Mimitangiatua in fresh flow. Sampling was re-scheduled for the coming weeks.
The high flows meant the twin culverts on the property were discharging at
details of sampling sites 8
Table 3 Results of comprehensive receiving environment monitoring 10
Table 4 Results of combined discharge (STW001027) and receiving water (MGO000031) monitoring 11
Table 5 Dry weather Sanger’s Intake (MGO000031) monitoring results 11
Table 6 Biomonitoring sites in the tributary of the Mangaone Stream 12
Table 7 Foundry deposition gauge results for the April 2023 survey 14
Table 8 Incidents, investigations, and interventions summary table 15
stormwater sampling results, 11 November 2022 63
Table 37 Summary of performance for MOVe consent 7578-1 63
Table 38 Summary of performance for MOVe consent 6952-1 64
Table 39 Summary of performance for Abraham consent 7147-2 67
Table 40 Mangati Stream sampling sites 69
Table 41 Sampling sites in associated tributaries of the Mangati Stream 69
Table 42 Mangati Stream wet weather sampling results, 17 November 2022 70
Table 43 Mangati Stream dry weather sampling results, 27
the Council is responsible for coordinating. Changes to this
programme were made for the 2021-2022 summer period. In brief, the programme has shifted from a dry
weather / trend monitoring approach, to a fixed day / all-weather approach. This change is intended to
enable the collection of data that is more representative of the full range of weather conditions to better
inform public health risk. Sampling during wet weather will often result in higher enterococci counts,
particularly due to
the introduction of discharges from the new Ravensdown site which have in the past been found
to be non-compliant in regard to ammoniacal nitrogen.
Low levels of light organic solvent preservative (LOSP) chemicals Propiconazole and Tebuconazole were
detected in the Mangaone Stream downstream of Taranaki Sawmills Ltd during a wet weather survey.
However, levels of these chemicals were similar to concentrations detected historically.
Monitoring of groundwater and leachate in relation to
investigations into the cap depth and compaction were carried out during the 2018-2019 year and
the remediation necessary was identified. It was found that there were areas where the cap depth needed to
be increased. An abatement notice was issued allowing NPDC until March 2020 to complete the work so that
the appropriate methodology could be developed and then be undertaken during the next dry weather
construction season. It was agreed that this could be delayed to prioritise working on the Stage 3 cap
safety risk to users in adverse weather conditions. Notably, the driftwood
and vegetation debris discussed in Section 2.3 above also impedes access along Weld Road beach.
Version: 1, Version Date: 24/10/2023
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Print Date: 1 May 2024, 4:19 p.m.
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Tonkin & Taylor Ltd
Weld Road Pathway and Ahu Ahu Bridge – Assessment of Effects on the Environment
New Plymouth District Council
in Table 2. As a result of vandalism during
the previous monitoring period, the Rimu Street site was decommissioned and replaced with the Vickers
Road Site, approximately 2.5 km downstream. Due to a significant weather event the sensor at Vickers Road
was washed away, resulting in a lack of data at this site for the monitoring period under review.
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Table 2 Water temperature monitoring sites in the Waiwhakaiho River
Site Location GPS Location Site code
presented in Table 3
(dry weather run) and Table 4 (wet weather run). Condition 4 of the stormwater discharge consent imposes
limits on pH, hydrocarbons, suspended solids, and dissolved zinc in the stormwater pond discharges to
ensure a minimum water quality before it enters the tributary. As discussed above there were no stormwater
samples collected during this monitoring year due to low or nil flow. There are no water quality consent
limits for the wastewater discharges.
Table 3 Results of
industries, were included in the monitoring programme during the
2022-2023 monitoring period. Of these, ten allow discharges to water, one allows a discharge to land, and
six allow discharges to air. These consents include a total of 220 conditions setting out the requirements
that the Company must satisfy.
The Council’s monitoring included 33 inspections, one wet weather sampling run and one discharge only
sampling run for physicochemical analysis. And a review of consent holder air quality