three day period
following significant river/stream fresh conditions. [NB: regional differences in
rainfall patterns have caused difficulties at various sites in the past as localised
rainfall may impact on bacteriological quality on isolated occasions]. Where
necessary, a 2 metre sampling pole was used for bacteriological sample collection
immediately beneath the water surface and at a minimum of calf depth at the sites.
Thirteen samples were collected from all but the Lake Ratapiko site (10
significant rainfall
events.
13. The Company continues to be proactive in their response to objectionable odour identification, with
areas of the main storage shed closed to prevent odour release. Mesh doors that were installed during
the 2020/21 period continue to prevent mass air movement from within the shed. The Company also
maintains shelter belts/vegetative environmental buffers (VEBs), as a passive odour mitigation
technique. These buffers continue to establish and mature.
timely results during the
holiday periods. Follow up samples were often collected following instances where enterococci counts
exceeded 140 cfu/100 ml.
During the 2017-2018 summer season, 89% of the 245 scheduled samples remained within surveillance
mode. January, February and March were the months where the highest proportions of samples exceeded
the MfE guidelines. These three months also received considerably higher levels of rainfall than normal.
Four of the five highest
with no unauthorised overflows to the stream of any nature. Two incidents of
stormwater/sewage overflows were reported in the Konini Street area of the township due
to surcharging of the reticulation under very heavy rainfall conditions. Reactivation of an
alarmed and telemetered overflow site has been necessary to alleviate sewage entry to
domestic property. Signage requirements have been recognised and provided for should
such events re-occur.
Pond microfloral monitoring which had
exceedance rainfall event (AEP) event. The
maximum discharge rate from the pond during large rainfall events is 1,060 L/s as this is dictated by the size
of the outfall pipe (750 mm). However, there is also provision for the pond to overflow via a spillway
structure to a discharge swale (i.e. bypassing the 750 mm discharge pipe).
At the time of the application it was indicated that, as a result of stormwater inputs to the pond, the
discharge rate from the pond to the Mangorei Stream would be
pipeline renewals
• $891 spent on CCTV.
The expenditure for pipeline renewals was entirely on project management, investigation and design. No
construction occurred.
A wastewater network modelling project is underway which uses rainfall and flow data to create a calibrated
digital model of the entire Inglewood wastewater network. The calibrated model will be used to assess
network performance under different storm events of varying duration and return interval, along with
projected
moderate
elevations 28
Figure 14 Groundwater elevations GND2691, GND2692 and 2693-located south east of the site at higher
altitudes 29
Figure 15 Groundwater elevations GND2700, GND2701 and GND2703-located centrally at the site at
moderate altitude 30
Figure 16 Groundwater elevations in the deep bore GND0599 in comparison to rainfall 31
Figure 17 Groundwater elevations in the shallow bores GND2702 and GND0600 in comparison to
rainfall 32
Figure 18 Groundwater elevations in
Operations and Regulatory Commiittee Agenda July 2024
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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
Waitaha Industrial Catchment Annual Report 2023-2024