boundary during any of the four routine inspections.
Results of effluent monitoring
With the diversion of wastes to the Hawera WWTP in the 2010/11 period, discharges from the Eltham
WWTP now occur only as a result of high rainfall events that exceed the storage capacity of the primary and
holding ponds, and the pumping capacity of the reticulated system to Hawera.
Analysis of the primary pond effluent was not required during the monitoring period, although the
condition of the pond and
page
Monthly Year to Date
Hydro_Sites # days >
0.5 mm
Total
Rainfall
(mm)
% of
typical
month
Total to
date (mm)
% of typical
year to date
% of typical
full year
Records
Began
North Egmont at
Visitors Centre 17 713.0 112.0 2257.0 99.2 33.6 1991
Dawson Falls 16 555.0 120.1 2196.5 139.5 48.8 1933
Kahui Hut 20 563.5 125.2 1665.0 101.3 34.5 2006
Mangorei Upper at
Forest Hill 17 450.5 118.6 1512.0
Ordinary Council Agenda August 2024
created no noticeable visual effects in the
receiving environment. The site was deemed compliant at the time of inspection.
11 December 2023
The inspection occurred during fine weather; there had been heavy rainfall during the previous day. Upon
arrival, the site gates were shut and locked. There was no change to the site since the last inspection as no
new material had been discharged. The swale contained water which was not discharging to the tributary.
No dust or odour issues were noted
also be a potential indicator of intensive land use
impact where fertiliser is applied to land (Rosen, 2001).
- - - - - -
Chloride (Cl)
Chloride is relatively unaffected by geochemical processes which makes it a good indicator of general
groundwater quality. The primary source of chloride in groundwater is marine sourced rainfall recharge to
an aquifer. However, saltwater intrusion and land use activities, such as wastewater and effluent
discharges, can contribute chloride to …
northwestern corner of the site is maintained by 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 (American Petroleum
Institute) separator system to the northeast of the site. The effluent from this separator is discharged to a
small unnamed tributary to the east which joins the Ngaere Stream approximately 40 m above its
confluence with
performance for consent 10247-1.1 17
Table 10 Evaluation of environmental performance over time 18
List of figures
Figure 1 Sampling site locations, Everett Road Quarry 10
Figure 2 Discharge rates from Civil Quarries stormwater system, plotted against rainfall in 10 minute
interval totals. The red line is the consented discharge rate limit 12
Figure 3 Abstraction rates from Civil Quarries Emergency pump. The red line is the consented
abstraction rate limit 13
List of
months,
increased water temperature, reduced rainfall
and increased daylight hours provide ideal
conditions for cyanobacteria to grow, sometimes
resulting in algal blooms. When in bloom,
cyanobacteria can produce toxins that can pose a
risk to the health of people and animals entering
the water.
Sites monitored for benthic cyanobacteria were
suitable for recreational use on 20 of 77 (26%)
routine surveys, and elevated to a cautionary
status during one (<2%) survey. Conditions were
page
Doc. No: 2955756
TARANAKI REGIONAL COUNCIL MONTHLY RAINFALL AND RIVER REPORT FOR December 2021
Provisional Data Only
Note: some sites record a number of parameters
Table 1: Rainfall at 27 sites throughout the region
Station Sub-region
Monthly Year to Date
Records Began Number of rain
days (>0.5mm)
Total Monthly
Rainfall (mm)
% of Monthly
Normal (%)
Maximum December
RF (year occurred)
(mm)
Total to date (mm)
% of Normal for year
to
investigation and design. No
construction occurred.
During the 2022/23 period expenditure on inflow and infiltration reduction consisted of:
• $457,127 spent on pipe renewals
• $17,774 spent on CCTV.
A wastewater network modelling project has recently been completed. This used rainfall and sewer 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