Wetland Solutions completed this project on-time and within budget. Existing facilities remained operational at all times during the construction.
This project required a “turn key” approach, input from design engineers and a variety of suppliers and contractors were successfully coordinated.
The Waipoua complex consists of 7 houses, a visitor centre, workshop, office building, 160 person campground, 2 kitchens, 10 tourist cabins, caretaker’s cottage and 2 ablution blocks with showers.
The existing on-site effluent disposal system consisted of a collection system utilising septic tanks and sewers to two sub-surface flow wetland cells with shallow trench disposal.
Clear felling of an upper catchment above the disposal area in November 2000 combined with winter rainfall conditions led to an elevated groundwater table saturating 30% of the existing disposal area, resulting in failure.
The project objectives were to provide a high level of wastewater treatment by designing, constructing and installing a contact sand filter and relocating the failed disposal area.
It was paramount that new and existing treatment facilities and the final disposal systems were located so as to not adversely affect the spiritual and physical qualities of the Waipoua River.
Clean and inspect all septic tanks, fit risers and eliminate ground/surface water intrusion
Install grease traps for campground and hall kitchens
Design, construct and install new sand filter to further treat effluent
Install new pump chamber and rising main to new disposal irrigation system
Replace sub-surface flow wetland aggregate with Meltzer slag
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