the presence of degradable organic
matter, taking into account the biological conversion of ammonia to nitrate
CCAB Copper chromium arsenate and boron (wood treatment chemicals)
Conductivity Conductivity, an indication of the level of dissolved salts in a sample, usually
measured at 25°C and expressed in mS/m
Cr Chromium
Cu* Copper
Fresh Elevated flow in a stream, such as after heavy rainfall
g/m3 Grams per cubic metre, and equivalent to milligrams per litre (mg/L). In
number of
land disposal systems and dual systems has been steadily
increasing in recent years.
The requirement for discharge to land would generally be
phased in as current resource consents are renewed.
Discretionary consents for discharge to water will still be
available for the small percentage of farmers unable to
discharge to land because of high rainfall and particular soil
types. High levels of treatment would be required.
Better farm management would also
solids. The unnamed tributary of
the Manawapou River was sampled on one occasion, and the samples analysed for the
same constituents.
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13
2. Results
2.1 Water
2.1.1 Inspections
Six inspections were carried out at the Rimu Production Station and associated
wellsites in the 2014-2015 year. The following was found during the inspections:
15 July 2014
The site was found to be neat and tidy. Recent heavy rainfall had not resulted in any
problems, with
fully contained. The level in the primary pond was slightly
higher than usual due to recent heavy rainfall throughout the catchment. This was turbid and green-brown
in colour. All aerators except the large Fonterra aerator were operating. A set of ‘4 Earth’ aerators had been
set up on the pond inlet. There were numerous birds present on the pond with an estimated excess of 1,000
mallard and paradise ducks.
Minor amounts of stormwater were noted in the holding pond following the recent wet
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6
night) via a 2.8 km pipeline, to the mixing chamber on the cliff top and combines
with wastewater from the Whareroa dairy factory for discharge via the 1,845 m long
Outfall.
During high rainfall events, the maturation pond can overflow into the neighbouring
emergency overflow/storage detention pond (capacity approximately 65,000 m3,
NIWA 2012) with wastewater then being passed back into Pond 1. Consent 7520-1
has been granted to allow overflow from the detention
regional significant river and important
recreational whitebait fishery. The Haehanga Catchment covers 5.73 km2 (TRC Explorer),
with monthly rainfall averaging 176 mm. The catchment geology in the Haehanga is
dominated by Papa mudstones which are easily eroded and can contribute to poor water
clarity in the water ways.
4.2.2.1 Haehanga Stream and tributaries
The Haehanga Stream is an entrenched meandering stream below the site, but adjacent the
composting facility the stream has been modified
samples were collected for analysis.
One abatement notice was issued in relation to untreated silt and sediment discharges
leaving the site due to heavy rainfall inundating the capacity of the silt and sediment
controls. Four samples were obtained and analysed in conjunction with this incident. Follow
up inspections found the abatement notice had been adhered to. These discharges were
deemed unlikely to have any significant adverse effect on receiving waters as discharges
were temporary in
STDC Kaponga, Manaia, Patea and Waverley WWTPs Monitoring Programme 2021-2022