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
hydrogeologic conditions (Taylor and Evans, 1999). These result in a complex
system of unconfined, perched and semi confined aquifers within the volcanic deposits. The water table in
the ring plain area is typically encountered between 1 to 10 m below ground level. Seasonal variations in
water table depth of up to 5 m are common. Groundwater flow generally reflects surface topography and
flows radially from Mount Taranaki. Recharge to the Taranaki volcanic aquifers is mainly by rainfall
hydrogeologic conditions (Taylor and Evans, 1999). These result in a complex
system of unconfined, perched and semi confined aquifers within the volcanic deposits. The water table in
the ring plain area is typically encountered between 1 to 10 m below ground level. Seasonal variations in
water table depth of up to 5 m are common. Groundwater flow generally reflects surface topography and
flows radially from Mount Taranaki. Recharge to the Taranaki volcanic aquifers is mainly by rainfall
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 one site (12 samples)
dot) 8
Figure 6 E-BAM set-up and instillation at Central School, New Plymouth 9
Figure 7 Location of Meteorological Stations with respect to the Central School monitoring site 11
Figure 8 Wind rose for the whole monitoring period (from hourly data) 12
Figure 9 Frequency of rainfall with wind direction 12
Figure 10 Boxplots of daily mean PM2.5 over the monitoring period 14
Figure 11 Number of days per year with PM2.5 concentrations 15
Figure 12 Temporal variations in …
opportunities and constraints for improving farm dairy effluent management .......... 23
6.1 Soil characteristics .................................................................................................................... 23
6.2 High rainfall and seasonal considerations ............................................................................ 23
6.3 Taranaki river flows and characteristics ............................................................................... 24
6.4
ponds
2014-2015 (between hours of 1100 – 1400). Data from pond
outlet. 13
Figure 3 Faecal coliform numbers in the HWWTP effluent(s), 1992 to
2015 15
Figure 4 Daily discharge volumes (m3/day) from the Hawera
oxidation ponds system and daily rainfall data (mm) from a
Council rainfall station approximately 5 km east of the
Hawera oxidation ponds, 1 July 2014 to 30 June 2015 17
page
iv
Figure 5 Location of marine ecological monitoring sites 18
Figure 6 Mean
Agenda Consents Regulatory Committee 15 March 2022
Regional Quarry Combined Biennial Report Southern Quarries 2022-2024
after a substantial rainfall event in the
hinterland and coincided with the highest turbidity (120 NTU) recorded during the
survey period. It has been noted, during past survey periods, that the three-day post
rainfall sampling protocols followed by the SEM programme for the other (ringplain)
catchment sites are not necessarily appropriate for baseline assessments of
bacteriological water quality at this site near the mouth of this predominantly eastern
hill country catchment river as a result