mixed with sawdust or other organic material and then piled up on the remediation pad. Any rainfall runoff and leachate that is generated, drains into a series of ponds for treatment. Between each pond 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 page 5 stored and/or processed further. The treated liquid from the pond treatment system
GND2703-located centrally at the site at moderate altitude 32 Figure 15 Groundwater elevations in the deep bore GND0599 in comparison to rainfall 33 Figure 16 Groundwater elevations in the shallow bores GND2702 and GND0600 in comparison to rainfall 34 Figure 17 Groundwater elevations in GND2702 and GND2700 located at the centre of the site at moderate altitudes in comparison to rainfall 35 Figure 18 Conductivity found in the groundwater at Central landfill 37 Figure 19 Nitrate/nitrite
access jetties to the outlet grids had been constructed by the consent holder relatively recently for cleaning and maintenance purposes. The new outlet from the final pond was clear of debris on all of the inspection occasions. The provision for influent splitting at the entrance to the ponds’ system had been designed for use only under high (stormwater infiltration) flows. The influent splitter is checked after heavy rainfall and on a regular weekly basis by the consent holder’s contractor
indicated that the Company were in compliance with consent defined conditions on the four occasions they were collected. It is noted that the stormwater facility discharge to surface water, only occurs during significant rainfall events. The facility is allowed noticeable, but not objectionable or offensive odour beyond the boundary of the site. In the past, noticeable odours have been noted during the loading and unloading exercises, when material is agitated, or fresh from the supplier.
de-silted on an as required basis. The second larger pond is unlined. The size of the pond provides storage for a 10% annual exceedance rainfall event (AEP) event. The maximum discharge rate from the pond during large rainfall events is 1,060 L/s as this is dictated by the size of the outfall pipe (750 mm). However, there is also provision for the pond to overflow via a spillway structure to a discharge swale (i.e. bypassing the 750 mm discharge pipe). A the time of the application it was
for further treatment prior to discharge to the Tasman Sea. This option utilises the existing ponds at Inglewood for attenuation during peak rainfall events. During extreme peak flows (i.e. when stormwater and groundwater infiltration is excessive), overflows from the pond were likely to occur given the limited amount of attenuation available. Accordingly, overflow facilities are to be utilised during peak storm flows to treat pond effluent before discharge to the stream occurs. No
nitrogen per hectare per year (KG/HA/YR), often called units of N. This is the difference between the total units of nitrogen brought onto the farm and the total units of nitrogen that leave the farm as products. A high amount of surplus nitrogen can indicate an inefficient conversion of available nitrogen into milk protein. Climate information including rainfall data as supplied by NIWA. IMPORTED SUPPLEMENTS (OR FROM STORAGE) EXPORTED SUPPLEMENTS (OR STORED)
Colson Road Landfill Monitoring Programme Annual Report 2020 2021
2012/13 resulting in a build up of windborne salt spray on the site which was washed into the stormwater system by significant rainfall prior to sampling. No adverse effects were noted on the receiving waters at the time of this discharge. There were no adverse effects on the environment as a result of discharges to air at the Pohokura facility. Inspections showed that emissions to air from flaring and other sources were well controlled, producing no adverse offsite effects. Self-monitoring by