Previous updates - July 2017 onwards
Latest News - Owhiro Stream incident 13 April 2018
GWRC received a notification just before 2pm on the 13th April about the Owhiro Stream being discoloured. Officers attended the incident and when they arrived it was noted that the water in the stream was no longer discoloured orange. GWRC are continuing to investigate the incident and are talking to the T&T Landfill operators to establish what could have caused the discolouration. As part of the investigation officers took samples from the stream which will be analysed.
Latest News - 13 November 2017
The western dam and perimeter swale have been completed and are now fully operational. Water from the western tributary is no longer entering the landfill. The western dam will take some days to fill. Once the water level in the dam has reached the outlet level the flow from the dam will be directed through the western swale and enter the tributary of the Owhiro Stream below the landfill. Photos of the western dam and swale are below.
Construction of the eastern dam is underway and is expected to be complete within the next month.
The revised design and programme for the construction of the stormwater diversion swales has been reviewed by GWRC’s consultant engineer. No changes to the revised design or programme but some important deliverables and aspects of the design are noted in the review memo. A copy of the updated design programme and peer review memo are available on this page. The revised programme shows an earlier completion date than previously programmed and puts more emphasis on the earlier completion of the swale and dam for the western catchment as this is the larger of the two upstream catchments.
Revised programme and staging plan
T and T Landfill have submitted a revised programme and staging plan for the construction of the stormwater diversion swales. The revised programme shows an earlier completion date than previously programmed and puts more emphasis on the earlier completion of the swale and dam for the western catchment as this is the larger of the two upstream catchments. GWRC’s consultant stormwater engineer is currently reviewing the revised progamme and staging plan. These documents, including the review comments, will be made available once the review is complete.
Progress on diversion swales
Works on the construction of the stormwater diversion swales is progressing well. The permanent swale from the stream to the landfill haul road is complete, as is the diversion swale in the Mitchell Street catchment. Contractors are currently progressing the swale construction across the landfill face and up the western side of the landfill.
Water quality improves due to diversion works
T and T Landfill have submitted the quarterly monitoring report up to June 2017. The water quality monitoring results are now in compliance with the consented limits. This may be due to the stormwater diversion works, which are resulting in less water entering the fill and leaching out contaminants to the stream. The quarterly monitoring report is available to view on this page.
Abatement notice issued to confirm stormwater diversion works
On 30 June 2017, GWRC issued T&T Landfills with an Abatement Notice for works relating to the (currently underway) construction of the all important stormwater diversion works. GWRC have decided to use this 'compliance tool' to reinforce the importance of completing the works in accordance with the staging plan and programme timetable submitted in May 2017. Any breaches of this abatement notice could result in punitive fines to T&T Landfills. The Abatement notice also requires that the consents for the diversion works are in place by January 2018.
The contractors on site have progressed the construction of the stormwater diversion swales in accordance with the work programme. The permanent swale from the Owhiro Stream tributary to the road on the site has been completed. Works on the swale across the landfill face to the western side of the site has commenced. GWRC and the landfills engineer continue to have monthly progress meetings on site.