the
environment. Organochlorine pesticides and arsenic can leach
slowly down the soil profile and can contaminate groundwater.
The extent of leaching will depend on the soil type, with greater
leaching occurring in sandy soils. The amount of rainfall or
irrigation will also influence leaching of contaminants through
the soil. Leaching may mean that the highest concentrations
of contaminants are below the soil surface at some sites. Soil
contamination has been measured to a depth of five
Ordinary Council Agenda February 2024 Part 1
uncovered settlement ponds receive
stormwater both directly and as run off from certain areas of the site, an excess of water may enter the
page
13
system during heavy or sustained rainfall, or if rainfall occurs when the plant is not operating. This excess is
discharged via a sand filter prior to entering the NPDC stormwater system, which discharges to the
Mangaone Stream immediately upstream of State Highway 3.
Allied Concrete holds water discharge permit 4539-2 to cover
Mangati catchment consent monitoring report 2017-2018
Mangati Catchment consent monitoring Annual report 2016-2017
Erosion and Sediment Control Plan that has been approved by the Chief Executive,
Taranaki Regional Council, acting in a certification capacity. This finalised plan shall
conform to the Waikato Regional Council’s Guidelines for Soil Disturbing Activities and
shall detail methodology/ design of stormwater drainage from the cleanfill, and
maintenance of sediment control practices, with a specific focus on rainfall events.
14. This consent shall lapse five years following the date of issue,
substrate and low rainfall at the beach would be restricting the production of leachate from the green
waste. It is therefore considered that, so long as STDC continues to monitor for and remove exposed
unacceptable material from the coastline, the environmental effects from the activities at the site are likely
to be no more than minor.
3.3 Evaluation of performance
A tabular summary of the consent holder’s compliance record for the year under review is set out in Table 2.
Table 2 Example
2015/2016 was completed during
2014/2015. Projects with clear benefit to Taranaki were identified
by Council staff and successfully advocated for: a review of a
national High Intensity Rainfall Design System (with benefits for
hydrology, river engineering and civil defence response), and
development of Discrete Water Quality Sampling Standards (SEM
and Policy/NPS-FW implementation benefits). The Envirolink
process for soliciting projects for funding in 2016/2017 has been
volume of wastewater irrigated to land and discharged to water,
compared with the monthly rainfall totals. Rainfall figures are from the
rainfall recorder located at TRC, Stratford. 27
Figure 9 Monthly wastewater volume compared with monthly total kill and total
monthly rainfall, including the R2 value. The closer the R2 value is to 1, the
stronger the relationship. 27
Figure 10 Sample results from the unnamed tributary upstream and downstream of
the Taranaki Abattoir wastewater