Again odour was
very minimal. No visual environmental impacts downstream of the discharge point to the Tawhiti Stream
observed at any time during the financial year.
Effluent collection points within piggery viewed during all inspections. Found to be in good condition, with
no signs of spills or overflows even after heavy prolonged rain periods. Bunding functioning well. During the
8th May inspection a burst underground effluent pipe between the southern sheds was brought to the
attention
million tonnes of soil.
On residential properties nearest to the Dow plant, soil dioxin concentrations were typically in the
range 5 to 15 ng/kg of soil, falling to a range of 1 to 5 ng/kg further out. One sample had a
concentration of 27 ng/kg. There was 92 ng/kg measured at a non-residential site, on the west-
facing slope of Mount Moturoa Domain.
Generally there was little difference between soil dioxin levels in lawn areas compared with
gardens on the same property.
the final aerobic pond into the neighbouring Waiongana Stream in
compliance with the conditions of Consent 0715.
Figure 1 Location of DH Lepper Trust piggery and Lepperton
1.3 Resource consents
Water abstraction permit 1.3.1
Section 14 of the RMA stipulates that no person may take, use, dam or divert any
water, unless the activity is expressly allowed for by a resource consent or a rule in a
regional plan, or it falls within some particular categories set out in
bacteriological sampling at four sites at Urenui and five sites at
Onaero.
The monitoring showed that the wastewater treatment systems at the beach camps did not adversely affect
the water quality of the local freshwater and coastal environments. Although high bacteriological results
were returned from the water quality sampling efforts, these counts were attributed to surface runoff
draining the upstream agricultural catchment, following the rains that preceded the sampling.
There was one
Waitaha Catchment Annual Report 2020-2021
STDC Kaponga Manaia Patea Waverley WWTPs Annual Report 2023-2024
remediation pad. Any rain run-off and leachate that is
generated, drains into a series of ponds for treatment. Between each pond there is a
baffle that skims off any floating hydrocarbons as the leachate passes through. These
ponds also treat the leachate and stormwater from pad 1 where remediated drilling
wastes are stored and/or processed further. The treated liquid from the pond
treatment system (PTS) is then irrigated to cut and carry pasture on two irrigation
areas.
Run off and leachate
Waiongana River systems. The total catchment area is approximately 6.1 km2. The length
of the catchment, from the headwaters between Paraite and Corbett Roads to the sea at Bell Block beach, is
approximately five kilometres.
The industrial area at Bell Block is situated mid-catchment (Figure 1). Historically, the industrial areas were
located predominantly on the western side of the stream however, ongoing development since 2016 has
resulted in more sites on the eastern side. These sites fall
sea, but these are generally few in number and only the rare spills have a major and
indeed measurable impact on seafoods in the area.
“Indirect” discharges is a term used to generally describe the effects of rivers on the
coast, and therefore include the considerable amounts of faecal bacteria, nutrients and
solids carried down the Waitara River after rain on the farms and hill country
upstream (now seen as the major source of these in local seafoods). The material and